#!/usr/bin/env python3
"""
gh.py — Multi-purpose CLI helper for penpot/penpot GitHub operations.

Uses GitHub GraphQL and REST APIs via the authenticated ``gh`` CLI.

Subcommands:
  issues      List issues in a milestone (or unassigned with milestone=none)
  issue       Fetch issue details by number (batched)
  comments    Fetch every comment of one or more issues
  prs         Fetch details for one or more PRs (by number or milestone)
  advisories  List or inspect GitHub security advisories
  link-issue  Explicitly link a GitHub issue to a pull request

Usage:
  python3 scripts/gh.py issues <milestone-title>            (default: state=closed)
  python3 scripts/gh.py issues "2.16.0" --state all
  python3 scripts/gh.py issues "2.16.0" --exclude "release blocker,no changelog"
  python3 scripts/gh.py issues "2.16.0" --label "bug"       (include only issues with label)
  python3 scripts/gh.py issues "2.16.0" --label "bug,regression" --exclude "no changelog"
  python3 scripts/gh.py issues "2.16.0" --compare CHANGES.md
  python3 scripts/gh.py issues none                         (issues with no milestone)
  python3 scripts/gh.py issues none --label "enhancement"
  python3 scripts/gh.py issues none --state open
  python3 scripts/gh.py prs 9179 9204 9311
  python3 scripts/gh.py prs --file prs.txt
  cat prs.txt | python3 scripts/gh.py prs --stdin
  python3 scripts/gh.py prs --milestone "2.16.0"            (default: state=merged)
  python3 scripts/gh.py prs --milestone "2.16.0" --state all
  python3 scripts/gh.py issue 11235 11236
  python3 scripts/gh.py comments 11235 11236
  python3 scripts/gh.py advisories                          (list all advisories)
  python3 scripts/gh.py advisories --severity critical      (filter by severity)
  python3 scripts/gh.py advisories GHSA-xvj6-fh9w-gjw7     (single advisory detail)
  python3 scripts/gh.py link-issue 11235 11243

Prerequisites:
  - gh CLI authenticated (gh auth status)
  - Python 3.8+
"""

import argparse
import json
import re
import subprocess
import sys
import time
from typing import Any


REPO = "penpot/penpot"
OWNER = "penpot"
REPO_NAME = "penpot"

# Transient gateway timeouts from the GitHub API are retried, nothing else.
GH_RETRIES = 3
GH_RETRY_DELAYS = (5, 15)  # seconds waited before retry N (last delay repeats)


def run_gh_command(cmd: list[str], input_text: str | None = None) -> str:
    """Run a ``gh`` command, retrying transient HTTP 504s.

    Raises `GhCommandFailed` on failure so callers can choose between
    aborting (normal commands) and degrading (batched lookups).
    """
    last_stderr = ""
    for attempt in range(GH_RETRIES):
        if attempt:
            delay = GH_RETRY_DELAYS[min(attempt - 1, len(GH_RETRY_DELAYS) - 1)]
            print(
                f"gh: HTTP 504, retrying in {delay}s"
                f" (attempt {attempt + 1}/{GH_RETRIES})...",
                file=sys.stderr,
            )
            time.sleep(delay)
        result = subprocess.run(
            cmd, input=input_text, capture_output=True, text=True
        )
        if result.returncode == 0:
            return result.stdout
        last_stderr = result.stderr
        if "504" not in result.stderr:
            break
    raise GhCommandFailed(last_stderr)


class GhCommandFailed(Exception):
    """A ``gh`` invocation failed (stderr kept for the caller to judge)."""

    def __init__(self, stderr: str) -> None:
        super().__init__(stderr)
        self.stderr = stderr


def fail_gh(stderr: str) -> None:
    """Report a ``gh`` failure and exit (standard behavior for CLI commands)."""
    print(f"gh error: {stderr}", file=sys.stderr)
    sys.exit(1)


# ─────────────────────────────────────────────
#  Shared helpers
# ─────────────────────────────────────────────


def post_graphql(query: str, variables: dict) -> Any:
    """POST a GraphQL query via ``gh`` and return the raw response body."""
    payload = json.dumps({"query": query, "variables": variables})
    stdout = run_gh_command(["gh", "api", "graphql", "--input", "-"], payload)
    return json.loads(stdout)


def run_gh_graphql(query: str, variables: dict) -> Any:
    """Run a GraphQL query via ``gh api graphql --input -``."""
    try:
        body = post_graphql(query, variables)
    except GhCommandFailed as err:
        fail_gh(err.stderr)
    if "errors" in body:
        for err in body["errors"]:
            print(f"GraphQL error: {err.get('message')}", file=sys.stderr)
        sys.exit(1)
    return body["data"]


def run_gh_rest(path: str) -> Any:
    """Run a REST API call via ``gh api``."""
    try:
        return json.loads(run_gh_command(["gh", "api", path]))
    except GhCommandFailed as err:
        fail_gh(err.stderr)


# ─────────────────────────────────────────────
#  Subcommand: link-issue
# ─────────────────────────────────────────────

GQL_LINK_TARGETS_QUERY = """\
query($owner: String!, $repo: String!, $issueNumber: Int!, $prNumber: Int!) {
  repository(owner: $owner, name: $repo) {
    issue(number: $issueNumber) { id number }
    pullRequest(number: $prNumber) { id number }
  }
}
"""

GQL_ADD_CLOSE_ISSUE_REFERENCES = """\
mutation($issueId: ID!, $pullRequestIds: [ID!]!) {
  addCloseIssueReferences(input: {issueId: $issueId, pullRequestIds: $pullRequestIds}) {
    issue { id number }
  }
}
"""

def link_issue_to_pr(issue_number: int, pr_number: int) -> dict:
    """Add an explicit GitHub issue-to-PR link.

    We trust the successful ``addCloseIssueReferences`` mutation instead of
    re-querying: GitHub does not reliably report mutation-created links
    through ``closedByPullRequestsReferences(userLinkedOnly: true)``.
    """
    if issue_number <= 0 or pr_number <= 0:
        raise ValueError("issue and pull request numbers must be positive")

    variables = {
        "owner": OWNER,
        "repo": REPO_NAME,
        "issueNumber": issue_number,
        "prNumber": pr_number,
    }
    target_data = run_gh_graphql(GQL_LINK_TARGETS_QUERY, variables)
    repository = target_data.get("repository") or {}
    issue = repository.get("issue") or {}
    pull_request = repository.get("pullRequest") or {}
    if not issue.get("id"):
        raise RuntimeError(f"issue #{issue_number} was not found in {REPO}")
    if not pull_request.get("id"):
        raise RuntimeError(f"pull request #{pr_number} was not found in {REPO}")

    mutation_data = run_gh_graphql(
        GQL_ADD_CLOSE_ISSUE_REFERENCES,
        {
            "issueId": issue["id"],
            "pullRequestIds": [pull_request["id"]],
        },
    )
    mutation_result = mutation_data.get("addCloseIssueReferences") or {}
    linked_issue = mutation_result.get("issue") or {}
    if linked_issue.get("number") != issue_number:
        raise RuntimeError(f"GitHub did not link issue #{issue_number}")

    return {
        "linked": True,
        "issue": {"number": issue_number},
        "pull_request": {"number": pr_number},
    }


def cmd_link_issue(args: argparse.Namespace) -> None:
    """Handle the ``link-issue`` subcommand."""
    print(
        f"Linking issue #{args.issue_number} to pull request #{args.pr_number}...",
        file=sys.stderr,
    )
    try:
        result = link_issue_to_pr(args.issue_number, args.pr_number)
    except (ValueError, RuntimeError) as error:
        print(f"ERROR: {error}", file=sys.stderr)
        sys.exit(1)

    print(
        f"Linked issue #{args.issue_number} -> pull request #{args.pr_number}",
        file=sys.stderr,
    )
    print(json.dumps(result, indent=2))


# ─────────────────────────────────────────────
#  Shared: milestone lookup
# ─────────────────────────────────────────────

GQL_FIND_MILESTONE_QUERY = """\
query($owner: String!, $repo: String!, $title: String!) {
  repository(owner: $owner, name: $repo) {
    milestones(query: $title, first: 20, states: [OPEN CLOSED]) {
      nodes {
        number
        title
        state
        issues(states: [OPEN]) { totalCount }
        closed_issues: issues(states: [CLOSED]) { totalCount }
      }
    }
  }
}
"""


def find_milestone(title: str) -> dict:
    """Look up milestone by title via GraphQL, return {number, title, open_issues, closed_issues}."""
    variables = {"owner": OWNER, "repo": REPO_NAME, "title": title}
    data = run_gh_graphql(GQL_FIND_MILESTONE_QUERY, variables)
    nodes = data["repository"]["milestones"]["nodes"]
    for ms in nodes:
        if ms["title"] == title:
            return {
                "number": ms["number"],
                "title": ms["title"],
                "open_issues": ms["issues"]["totalCount"],
                "closed_issues": ms["closed_issues"]["totalCount"],
            }
    print(f"ERROR: Milestone \"{title}\" not found in {REPO}", file=sys.stderr)
    sys.exit(1)


# ─────────────────────────────────────────────
#  Subcommand: issues
# ─────────────────────────────────────────────

GQL_ISSUES_QUERY = """\
query($owner: String!, $repo: String!, $milestone: Int!, $cursor: String) {
  repository(owner: $owner, name: $repo) {
    milestone(number: $milestone) {
      issues(first: 100, after: $cursor, states: __STATES__) {
        totalCount
        pageInfo { hasNextPage endCursor }
          nodes {
            ... on Issue {
              number
              title
              state
              issueType { name }
              labels(first: 20) { nodes { name } }
              assignees(first: 10) { nodes { login } }
              closedByPullRequestsReferences(first: 5) { nodes { number } }
              projectItems(first: 10) {
                nodes {
                  project { title }
                  fieldValueByName(name: "Status") {
                    ... on ProjectV2ItemFieldSingleSelectValue {
                      name
                    }
                  }
                }
              }
            }
        }
      }
    }
  }
}
"""


GQL_NO_MILESTONE_QUERY = """\
query($query: String!, $cursor: String) {
  search(
    query: $query
    type: ISSUE
    first: 100
    after: $cursor
  ) {
    issueCount
    pageInfo { hasNextPage endCursor }
    nodes {
      ... on Issue {
        number
        title
        state
        milestone { title }
        issueType { name }
        labels(first: 20) { nodes { name } }
        assignees(first: 10) { nodes { login } }
        closedByPullRequestsReferences(first: 5) { nodes { number } }
        projectItems(first: 10) {
          nodes {
            project { title }
            fieldValueByName(name: "Status") {
              ... on ProjectV2ItemFieldSingleSelectValue {
                name
              }
            }
          }
        }
      }
    }
  }
}
"""


def node_assignees(node: dict) -> list[str]:
    """Extract assignee logins from a GraphQL issue/PR node."""
    return [
        a["login"] for a in (node.get("assignees") or {}).get("nodes") or []
    ]


def node_projects(node: dict) -> list[str]:
    """Extract project board titles from a GraphQL issue node."""
    return [
        (pi.get("project") or {}).get("title")
        for pi in (node.get("projectItems") or {}).get("nodes") or []
        if (pi.get("project") or {}).get("title")
    ]


def node_main_status(node: dict) -> str | None:
    """Extract the "Main" project board status from a GraphQL issue node."""
    for pi in (node.get("projectItems") or {}).get("nodes") or []:
        project = pi.get("project") or {}
        if project.get("title") == "Main":
            status_field = pi.get("fieldValueByName") or {}
            return status_field.get("name")
    return None


def fetch_no_milestone_issues(states: str, labels: str | None = None) -> list[dict]:
    """
    Fetch all issues that belong to NO milestone via paginated GraphQL search.

    Args:
        states: GraphQL states enum array literal, e.g. ``"[CLOSED]"`` or ``"[OPEN CLOSED]"``
        labels: optional comma-separated labels to include (built into the search query)

    Returns:
        List of {number, title, state, milestone, issue_type, labels, assignees, closing_prs, project_status, projects}
    """
    all_nodes: list[dict] = []
    cursor: str | None = None

    # Map states enum literal to search qualifiers
    state_qualifiers = {
        "[OPEN]": "is:open",
        "[CLOSED]": "is:closed",
        "[OPEN CLOSED]": "",
    }
    state_q = state_qualifiers.get(states, "")
    label_q = ""
    if labels:
        for lbl in labels.split(","):
            label_q += f" label:\"{lbl.strip()}\""
    search_query = f"repo:{OWNER}/{REPO_NAME} is:issue no:milestone{state_q}{label_q}".strip()
    while True:
        variables: dict[str, Any] = {
            "query": search_query,
            "cursor": cursor,
        }
        data = run_gh_graphql(GQL_NO_MILESTONE_QUERY, variables)
        search = data["search"]
        page_info = search["pageInfo"]

        for node in search["nodes"]:
            if node is None:
                continue
            issue_type = node.get("issueType")
            ms = node.get("milestone")
            all_nodes.append({
                "number": node["number"],
                "title": node["title"],
                "state": node["state"],
                "milestone": ms["title"] if ms else None,
                "issue_type": issue_type["name"] if issue_type else None,
                "labels": [lbl["name"] for lbl in node["labels"]["nodes"]],
                "assignees": node_assignees(node),
                "closing_prs": [pr["number"] for pr in node["closedByPullRequestsReferences"]["nodes"]],
                "project_status": node_main_status(node),
                "projects": node_projects(node),
            })

        total = len(all_nodes)
        print(f"  ... fetched {total} issues so far", file=sys.stderr)

        if not page_info["hasNextPage"]:
            break
        cursor = page_info["endCursor"]

    return all_nodes


def fetch_milestone_issues(milestone_num: int, states: str) -> list[dict]:
    """
    Fetch all issues in a milestone via paginated GraphQL.

    Args:
        milestone_num: milestone number
        states: GraphQL states enum array literal, e.g. ``"[CLOSED]"`` or ``"[OPEN CLOSED]"``

    Returns:
        List of {number, title, state, issue_type: str|None, labels: [str], assignees: [str], closing_prs: [int], project_status, projects}
    """
    query = GQL_ISSUES_QUERY.replace("__STATES__", states)
    all_nodes: list[dict] = []
    cursor: str | None = None

    while True:
        variables: dict[str, Any] = {
            "owner": OWNER,
            "repo": REPO_NAME,
            "milestone": milestone_num,
            "cursor": cursor,
        }
        data = run_gh_graphql(query, variables)
        issues = data["repository"]["milestone"]["issues"]
        page_info = issues["pageInfo"]

        for node in issues["nodes"]:
            if node is None:
                continue
            issue_type = node.get("issueType")
            all_nodes.append({
                "number": node["number"],
                "title": node["title"],
                "state": node["state"],
                "issue_type": issue_type["name"] if issue_type else None,
                "labels": [lbl["name"] for lbl in node["labels"]["nodes"]],
                "assignees": node_assignees(node),
                "closing_prs": [pr["number"] for pr in node["closedByPullRequestsReferences"]["nodes"]],
                "project_status": node_main_status(node),
                "projects": node_projects(node),
            })

        total = len(all_nodes)
        print(f"  ... fetched {total} issues so far", file=sys.stderr)

        if not page_info["hasNextPage"]:
            break
        cursor = page_info["endCursor"]

    return all_nodes


def load_existing_issue_numbers(filepath: str) -> set[int]:
    """Parse all ``#NNNN`` references from a file (e.g. CHANGES.md)."""
    pattern = re.compile(r"#(\d{3,5})\b")
    nums: set[int] = set()
    with open(filepath) as f:
        for line in f:
            for m in pattern.finditer(line):
                nums.add(int(m.group(1)))
    return nums


def cmd_issues(args: argparse.Namespace) -> None:
    """Handle the ``issues`` subcommand."""

    # Map state to GraphQL enum array literal
    state_map = {"open": "[OPEN]", "closed": "[CLOSED]", "all": "[OPEN CLOSED]"}
    gql_states = state_map[args.state]

    # ── No-milestone path ──────────────────────────────────────────
    if args.milestone and args.milestone.lower() == "none":
        print("Fetching issues with NO milestone...", file=sys.stderr)
        issues = fetch_no_milestone_issues(gql_states, labels=args.label)
        print(f"Fetched {len(issues)} issues total", file=sys.stderr)

    # ── Milestone path ─────────────────────────────────────────────
    else:
        print(f"Looking up milestone \"{args.milestone}\"...", file=sys.stderr)
        ms = find_milestone(args.milestone)
        print(f"Milestone #{ms['number']}: {ms['open_issues']} open, {ms['closed_issues']} closed",
              file=sys.stderr)
        print(f"Fetching {args.state} issues via GraphQL...", file=sys.stderr)
        issues = fetch_milestone_issues(ms["number"], gql_states)
        print(f"Fetched {len(issues)} issues total", file=sys.stderr)

    # Filter by excluded labels
    if args.exclude:
        exclusions = set(label.strip() for label in args.exclude.split(","))
        filtered = [issue for issue in issues
                    if not any(lbl in exclusions for lbl in issue["labels"])]
        print(f"After excluding labels: {len(filtered)} issues", file=sys.stderr)
        issues = filtered

    # Exclude issues with type "Task" (internal chores) — opt out with --include-tasks
    if not args.include_tasks:
        tasks = [iss for iss in issues if iss.get("issue_type") == "Task"]
        if tasks:
            issues = [iss for iss in issues if iss.get("issue_type") != "Task"]
            print(f"After excluding Task issues: {len(issues)} issues (removed {len(tasks)}: {[t['number'] for t in tasks]})", file=sys.stderr)

    # Filter by included labels (--label) — issue must have ALL specified labels
    if args.label:
        inclusions = set(label.strip() for label in args.label.split(","))
        filtered = [issue for issue in issues
                    if all(lbl in issue["labels"] for lbl in inclusions)]
        print(f"After filtering by labels: {len(filtered)} issues", file=sys.stderr)
        issues = filtered

    # Filter out issues with "Rejected" project status (unless --include-rejected)
    if not args.include_rejected:
        rejected = [iss for iss in issues if iss.get("project_status") == "Rejected"]
        if rejected:
            issues = [iss for iss in issues if iss.get("project_status") != "Rejected"]
            print(f"After excluding rejected: {len(issues)} issues (removed {len(rejected)}: {[r['number'] for r in rejected]})", file=sys.stderr)

    # Filter to issues NOT yet in the comparison file (if --compare given)
    if args.compare:
        existing_nums = load_existing_issue_numbers(args.compare)
        missing = [iss for iss in issues if iss["number"] not in existing_nums]
        missing.sort(key=lambda x: x["number"])
        print(f"Issues not yet in changelog: {len(missing)}", file=sys.stderr)
        issues = missing

    print(json.dumps(issues, indent=2))


# ─────────────────────────────────────────────
#  Subcommand: prs
# ─────────────────────────────────────────────

PRS_BATCH_SIZE = 50

GQL_PRS_QUERY_ITEM = """\
    pr_{num}: pullRequest(number: {num}) {{
      number
      title
      body
      state
      mergedAt
      createdAt
      milestone {{ title }}
      author {{ login }}
      assignees(first: 10) {{ nodes {{ login }} }}
      labels(first: 20) {{ nodes {{ name }} }}
      closingIssuesReferences(first: 5) {{ nodes {{ number }} }}
    }}
"""

GQL_PRS_QUERY_WRAPPER = """\
query($owner: String!, $repo: String!) {{
  repository(owner: $owner, name: $repo) {{
{items}
  }}
}}
"""


def fetch_prs_batch(pr_numbers: list[int]) -> list[dict]:
    """
    Fetch details for a list of PR numbers in a single GraphQL query.

    Uses numbered aliases (pr_1234, pr_5678, …) so each PR is looked up by
    number in one round-trip. Returns entries in the same order as the input.
    """
    items = "\n".join(
        GQL_PRS_QUERY_ITEM.format(num=n) for n in pr_numbers
    )
    query = GQL_PRS_QUERY_WRAPPER.format(items=items)
    variables = {"owner": OWNER, "repo": REPO_NAME}

    data = run_gh_graphql(query, variables)
    repo = data["repository"]

    results: list[dict] = []
    for num in pr_numbers:
        pr = repo.get(f"pr_{num}")
        if pr is None:
            results.append({
                "number": num,
                "error": "not_found",
            })
            continue
        results.append({
            "number": pr["number"],
            "title": pr["title"],
            "body": pr.get("body"),
            "state": pr["state"],
            "merged_at": pr.get("mergedAt"),
            "created_at": pr.get("createdAt"),
            "milestone": (pr.get("milestone") or {}).get("title"),
            "author": pr["author"]["login"] if pr["author"] else None,
            "assignees": node_assignees(pr),
            "labels": [lbl["name"] for lbl in pr["labels"]["nodes"]],
            "closing_issues": [iss["number"] for iss in pr["closingIssuesReferences"]["nodes"]],
        })
    return results


GQL_MILESTONE_PRS_QUERY = """\
query($owner: String!, $repo: String!, $milestone: Int!, $cursor: String) {
  repository(owner: $owner, name: $repo) {
    milestone(number: $milestone) {
      pullRequests(first: 100, after: $cursor, states: __STATES__) {
        totalCount
        pageInfo { hasNextPage endCursor }
        nodes {
          ... on PullRequest {
            number
            title
            body
            state
            mergedAt
            createdAt
            headRefName
            author { login }
            assignees(first: 10) { nodes { login } }
            labels(first: 20) { nodes { name } }
            files(first: 100) { nodes { path } }
            closingIssuesReferences(first: 5) { nodes { number } }
          }
        }
      }
    }
  }
}
"""


def fetch_milestone_prs(milestone_num: int, states: str) -> list[dict]:
    """
    Fetch all pull requests in a milestone via paginated GraphQL.

    Args:
        milestone_num: milestone number
        states: GraphQL states enum array literal, e.g. ``"[MERGED]"`` or ``"[OPEN CLOSED MERGED]"``

    Returns:
        List of {number, title, body, state, merged_at, created_at,
                head_ref_name, author, assignees, labels: [str], files: [str],
                closing_issues: [int]}
    """
    query = GQL_MILESTONE_PRS_QUERY.replace("__STATES__", states)
    all_nodes: list[dict] = []
    cursor: str | None = None

    while True:
        variables: dict[str, Any] = {
            "owner": OWNER,
            "repo": REPO_NAME,
            "milestone": milestone_num,
            "cursor": cursor,
        }
        data = run_gh_graphql(query, variables)
        prs = data["repository"]["milestone"]["pullRequests"]
        page_info = prs["pageInfo"]

        for node in prs["nodes"]:
            if node is None:
                continue
            all_nodes.append({
                "number": node["number"],
                "title": node["title"],
                "body": node.get("body"),
                "state": node["state"],
                "merged_at": node.get("mergedAt"),
                "created_at": node.get("createdAt"),
                "head_ref_name": node.get("headRefName"),
                "author": node["author"]["login"] if node["author"] else None,
                "assignees": node_assignees(node),
                "labels": [lbl["name"] for lbl in node["labels"]["nodes"]],
                "files": [file["path"] for file in node["files"]["nodes"]],
                "closing_issues": [iss["number"] for iss in node["closingIssuesReferences"]["nodes"]],
            })

        total = len(all_nodes)
        print(f"  ... fetched {total} PRs so far", file=sys.stderr)

        if not page_info["hasNextPage"]:
            break
        cursor = page_info["endCursor"]

    return all_nodes


def cmd_prs(args: argparse.Namespace) -> None:
    """Handle the ``prs`` subcommand."""

    # ── Milestone path ──────────────────────────────────────────────
    if args.milestone:
        print(f"Looking up milestone \"{args.milestone}\"...", file=sys.stderr)
        ms = find_milestone(args.milestone)

        state_map = {"open": "[OPEN]", "closed": "[CLOSED]", "merged": "[MERGED]", "all": "[OPEN CLOSED MERGED]"}
        gql_states = state_map[args.state]

        print(f"Fetching {args.state} PRs via GraphQL...", file=sys.stderr)
        prs = fetch_milestone_prs(ms["number"], gql_states)
        for pr in prs:
            pr["milestone"] = ms["title"]
        print(f"Fetched {len(prs)} PRs total", file=sys.stderr)
        print(json.dumps(prs, indent=2))
        return

    # ── Number-based path ───────────────────────────────────────────
    pr_numbers = read_numbers_from_args(args)
    if not pr_numbers:
        print("ERROR: no PR numbers provided (pass numbers, --file, --stdin, or --milestone)",
              file=sys.stderr)
        sys.exit(1)

    print(f"Fetching {len(pr_numbers)} PRs in batches of {PRS_BATCH_SIZE}...",
          file=sys.stderr)

    all_results: list[dict] = []
    for i in range(0, len(pr_numbers), PRS_BATCH_SIZE):
        batch = pr_numbers[i : i + PRS_BATCH_SIZE]
        print(f"  batch {i // PRS_BATCH_SIZE + 1}: PRs {batch[0]}..{batch[-1]}",
              file=sys.stderr)
        all_results.extend(fetch_prs_batch(batch))

    print(json.dumps(all_results, indent=2))


# ─────────────────────────────────────────────
#  Subcommand: issue (fetch issues by number, batched)
# ─────────────────────────────────────────────

GQL_ISSUE_BY_NUMBER_QUERY_ITEM = """\
    issue_{num}: issue(number: {num}) {{
      number
      title
      state
      milestone {{ title }}
      issueType {{ name }}
      labels(first: 20) {{ nodes {{ name }} }}
      assignees(first: 10) {{ nodes {{ login }} }}
      closedByPullRequestsReferences(first: 5) {{ nodes {{ number }} }}
      projectItems(first: 10) {{
        nodes {{
          project {{ title }}
          fieldValueByName(name: "Status") {{
            ... on ProjectV2ItemFieldSingleSelectValue {{
              name
            }}
          }}
        }}
      }}
    }}
"""


def issue_node_to_dict(node: dict) -> dict:
    """Convert a GraphQL issue node to the shared issue dict shape."""
    issue_type = node.get("issueType")
    ms = node.get("milestone")
    return {
        "number": node["number"],
        "title": node["title"],
        "state": node["state"],
        "milestone": ms["title"] if ms else None,
        "issue_type": issue_type["name"] if issue_type else None,
        "labels": [lbl["name"] for lbl in node["labels"]["nodes"]],
        "assignees": node_assignees(node),
        "closing_prs": [pr["number"] for pr in node["closedByPullRequestsReferences"]["nodes"]],
        "project_status": node_main_status(node),
        "projects": node_projects(node),
    }


class IssueBatchFailed(Exception):
    """One aliased issue lookup failed; the batch cannot be trusted as a whole."""


def _fetch_issues_batch(issue_numbers: list[int]) -> list[dict]:
    """Single batched issue lookup; raises `IssueBatchFailed` on any failure."""
    items = "\n".join(
        GQL_ISSUE_BY_NUMBER_QUERY_ITEM.format(num=n) for n in issue_numbers
    )
    query = GQL_PRS_QUERY_WRAPPER.format(items=items)
    variables = {"owner": OWNER, "repo": REPO_NAME}

    try:
        body = post_graphql(query, variables)
    except GhCommandFailed as err:
        raise IssueBatchFailed(err.stderr) from err
    if "errors" in body:
        raise IssueBatchFailed("; ".join(e.get("message", "") for e in body["errors"]))
    repo = body["data"]["repository"]

    results: list[dict] = []
    for num in issue_numbers:
        node = repo.get(f"issue_{num}")
        if node is None:
            results.append({
                "number": num,
                "error": "not_found",
            })
            continue
        results.append(issue_node_to_dict(node))
    return results


def fetch_issues_batch(issue_numbers: list[int]) -> list[dict]:
    """
    Fetch details for a list of issue numbers in a single GraphQL query.

    Uses numbered aliases (issue_1234, …) so each issue is looked up by
    number in one round-trip. Returns entries in the same order as the input.

    Unlike PRs (which resolve to null), a dead issue number fails the whole
    batch, so when the failure names an unresolvable issue each number is
    retried on its own and reported as ``not_found`` instead of aborting.
    Any other failure (auth, outage, exhausted 504 retries) still aborts.
    """
    try:
        return _fetch_issues_batch(issue_numbers)
    except IssueBatchFailed as err:
        if "Could not resolve" not in str(err):
            print(f"GraphQL error: {err}", file=sys.stderr)
            sys.exit(1)
        print("  batch lookup failed, retrying issues one by one...",
              file=sys.stderr)
        results: list[dict] = []
        for num in issue_numbers:
            try:
                results.extend(_fetch_issues_batch([num]))
            except IssueBatchFailed:
                results.append({"number": num, "error": "not_found"})
        return results


def read_numbers_from_args(args: argparse.Namespace) -> list[int]:
    """Collect numbers from positional args, --file, and/or --stdin (deduplicated)."""
    numbers: list[int] = []
    if args.numbers:
        numbers.extend(args.numbers)
    if args.file:
        with open(args.file) as f:
            for line in f:
                line = line.strip()
                if line:
                    numbers.append(int(line))
    if args.stdin:
        for line in sys.stdin:
            line = line.strip()
            if line:
                numbers.append(int(line))
    seen: set[int] = set()
    return [n for n in numbers if not (n in seen or seen.add(n))]


def cmd_issue(args: argparse.Namespace) -> None:
    """Handle the ``issue`` subcommand (batched by-number lookup, no filters)."""
    issue_numbers = read_numbers_from_args(args)
    if not issue_numbers:
        print("ERROR: no issue numbers provided (pass numbers, --file, or --stdin)",
              file=sys.stderr)
        sys.exit(1)

    print(f"Fetching {len(issue_numbers)} issues in batches of {PRS_BATCH_SIZE}...",
          file=sys.stderr)

    all_results: list[dict] = []
    for i in range(0, len(issue_numbers), PRS_BATCH_SIZE):
        batch = issue_numbers[i : i + PRS_BATCH_SIZE]
        print(f"  batch {i // PRS_BATCH_SIZE + 1}: issues {batch[0]}..{batch[-1]}",
              file=sys.stderr)
        all_results.extend(fetch_issues_batch(batch))

    print(json.dumps(all_results, indent=2))


# ─────────────────────────────────────────────
#  Subcommand: comments
# ─────────────────────────────────────────────

COMMENTS_PER_PAGE = 100


def fetch_issue_comments(issue_number: int) -> list[dict]:
    """Fetch every comment of an issue via REST, oldest first."""
    comments: list[dict] = []
    page = 1
    while True:
        batch = run_gh_rest(
            f"repos/{REPO}/issues/{issue_number}/comments"
            f"?per_page={COMMENTS_PER_PAGE}&page={page}"
        )
        for comment in batch:
            comments.append({
                "issue": issue_number,
                "id": comment["id"],
                "author": (comment.get("user") or {}).get("login"),
                "created_at": comment.get("created_at"),
                "body": comment.get("body"),
            })
        if len(batch) < COMMENTS_PER_PAGE:
            return comments
        page += 1


def cmd_comments(args: argparse.Namespace) -> None:
    """Handle the ``comments`` subcommand (REST, paginated per issue)."""
    issue_numbers = read_numbers_from_args(args)
    if not issue_numbers:
        print("ERROR: no issue numbers provided (pass numbers, --file, or --stdin)",
              file=sys.stderr)
        sys.exit(1)

    all_comments: list[dict] = []
    for num in issue_numbers:
        print(f"Fetching comments for issue #{num}...", file=sys.stderr)
        all_comments.extend(fetch_issue_comments(num))

    print(json.dumps(all_comments, indent=2))


# ─────────────────────────────────────────────
#  Subcommand: advisories
# ─────────────────────────────────────────────


def fetch_advisories() -> list[dict]:
    """Fetch all security advisories for the repository via REST API."""
    all_advisories: list[dict] = []
    page = 1

    while True:
        advisories = run_gh_rest(
            f"repos/{REPO}/security-advisories?per_page=100&page={page}"
        )
        all_advisories.extend(advisories)

        if len(advisories) < 100:
            break
        page += 1

    return all_advisories


def fetch_advisory(ghsa_id: str) -> dict:
    """Fetch a single security advisory by GHSA ID."""
    return run_gh_rest(f"repos/{REPO}/security-advisories/{ghsa_id}")


def format_advisory_summary(adv: dict) -> dict:
    """Extract a summary view of an advisory."""
    return {
        "ghsa_id": adv["ghsa_id"],
        "cve_id": adv.get("cve_id"),
        "severity": adv.get("severity"),
        "cvss_score": (adv.get("cvss") or {}).get("score"),
        "state": adv.get("state"),
        "summary": adv.get("summary"),
        "cwes": [c["cwe_id"] for c in adv.get("cwes", [])],
        "published_at": adv.get("published_at"),
        "closed_at": adv.get("closed_at"),
        "url": adv.get("html_url"),
    }


def format_advisory_detail(adv: dict) -> dict:
    """Extract full detail view of an advisory."""
    summary = format_advisory_summary(adv)
    summary["description"] = adv.get("description")
    summary["vulnerabilities"] = [
        {
            "package": v.get("package", {}).get("name"),
            "vulnerable_version_range": v.get("vulnerable_version_range"),
            "patched_versions": v.get("patched_versions"),
        }
        for v in adv.get("vulnerabilities", [])
    ]
    summary["credits"] = [
        {"login": c.get("user", {}).get("login"), "type": c.get("type")}
        for c in adv.get("credits_detailed", [])
    ]
    summary["created_at"] = adv.get("created_at")
    summary["updated_at"] = adv.get("updated_at")
    summary["withdrawn_at"] = adv.get("withdrawn_at")
    return summary


def cmd_advisories(args: argparse.Namespace) -> None:
    """Handle the ``advisories`` subcommand."""

    # ── Single advisory detail ──────────────────────────────
    if args.ghsa_id:
        ghsa_id = args.ghsa_id.upper()
        if not ghsa_id.startswith("GHSA-"):
            ghsa_id = f"GHSA-{ghsa_id}"
        print(f"Fetching advisory {ghsa_id}...", file=sys.stderr)
        adv = fetch_advisory(ghsa_id)
        print(json.dumps(format_advisory_detail(adv), indent=2))
        return

    # ── List all advisories ─────────────────────────────────
    print("Fetching security advisories...", file=sys.stderr)
    advisories = fetch_advisories()
    print(f"Fetched {len(advisories)} advisories", file=sys.stderr)

    results = [format_advisory_summary(adv) for adv in advisories]

    # Apply filters
    if args.severity:
        sev = args.severity.lower()
        results = [r for r in results if (r.get("severity") or "").lower() == sev]
        print(f"After severity filter ({sev}): {len(results)} advisories", file=sys.stderr)

    if args.state:
        st = args.state.lower()
        results = [r for r in results if (r.get("state") or "").lower() == st]
        print(f"After state filter ({st}): {len(results)} advisories", file=sys.stderr)

    print(json.dumps(results, indent=2))


# ─────────────────────────────────────────────
#  CLI entrypoint
# ─────────────────────────────────────────────


def main() -> None:
    parser = argparse.ArgumentParser(
        description="Multi-purpose CLI helper for penpot/penpot GitHub operations"
    )
    sub = parser.add_subparsers(dest="command", required=True, title="subcommands")

    # --- issues ---
    p_issues = sub.add_parser("issues", help="List issues in a milestone (or use 'none' for unassigned)")
    p_issues.add_argument("milestone", help="Milestone title (e.g. '2.16.0') or 'none' for issues with no milestone")
    p_issues.add_argument(
        "--state", choices=["open", "closed", "all"], default="closed",
        help="Issue state filter (default: closed)"
    )
    p_issues.add_argument(
        "--exclude", "--exclude-labels",
        help="Comma-separated labels to exclude, e.g. 'release blocker,no changelog'"
    )
    p_issues.add_argument(
        "--label", "--labels",
        help="Comma-separated labels to include (issue must have ALL specified), e.g. 'bug' or 'bug,regression'"
    )
    p_issues.add_argument(
        "--compare",
        help="Path to CHANGES.md; only show issues NOT yet referenced in that file"
    )
    p_issues.add_argument(
        "--include-rejected", action="store_true",
        help="Include issues with 'Rejected' project status (excluded by default)"
    )
    p_issues.add_argument(
        "--include-tasks", action="store_true",
        help="Include issues with type 'Task' (excluded by default, they are internal chores)"
    )
    p_issues.set_defaults(func=cmd_issues)

    # --- prs ---
    p_prs = sub.add_parser("prs", help="Fetch details for one or more PRs (by number or milestone)")
    p_prs.add_argument(
        "numbers", type=int, nargs="*",
        help="PR numbers to fetch (space-separated)"
    )
    p_prs.add_argument(
        "--file", type=str,
        help="File with one PR number per line"
    )
    p_prs.add_argument(
        "--stdin", action="store_true",
        help="Read PR numbers from stdin (one per line)"
    )
    p_prs.add_argument(
        "--milestone", type=str,
        help="Milestone title, e.g. '2.16.0' (fetches all PRs in the milestone)"
    )
    p_prs.add_argument(
        "--state", choices=["open", "closed", "merged", "all"], default="merged",
        help="PR state filter when using --milestone (default: merged)"
    )
    p_prs.set_defaults(func=cmd_prs)

    # --- link-issue ---
    p_link = sub.add_parser(
        "link-issue",
        aliases=["link"],
        help="Explicitly link an issue to a pull request",
    )
    p_link.add_argument("issue_number", type=int, help="Issue number")
    p_link.add_argument("pr_number", type=int, help="Pull request number")
    p_link.set_defaults(func=cmd_link_issue)

    # --- issue (by-number lookup) ---
    p_issue = sub.add_parser(
        "issue", help="Fetch details for one or more issues by number (batched)"
    )
    p_issue.add_argument(
        "numbers", type=int, nargs="*",
        help="Issue numbers to fetch (space-separated)"
    )
    p_issue.add_argument(
        "--file", type=str,
        help="File with one issue number per line"
    )
    p_issue.add_argument(
        "--stdin", action="store_true",
        help="Read issue numbers from stdin (one per line)"
    )
    p_issue.set_defaults(func=cmd_issue)

    # --- comments ---
    p_comments = sub.add_parser(
        "comments", help="Fetch every comment of one or more issues"
    )
    p_comments.add_argument(
        "numbers", type=int, nargs="*",
        help="Issue numbers to fetch (space-separated)"
    )
    p_comments.add_argument(
        "--file", type=str,
        help="File with one issue number per line"
    )
    p_comments.add_argument(
        "--stdin", action="store_true",
        help="Read issue numbers from stdin (one per line)"
    )
    p_comments.set_defaults(func=cmd_comments)

    # --- advisories ---
    p_adv = sub.add_parser("advisories", help="List or inspect GitHub security advisories")
    p_adv.add_argument(
        "ghsa_id", nargs="?",
        help="GHSA ID to fetch (e.g. 'GHSA-xvj6-fh9w-gjw7'); omit to list all"
    )
    p_adv.add_argument(
        "--severity", choices=["critical", "high", "medium", "low"],
        help="Filter by severity level"
    )
    p_adv.add_argument(
        "--state", choices=["triage", "draft", "published", "closed", "withdrawn"],
        help="Filter by advisory state"
    )
    p_adv.set_defaults(func=cmd_advisories)

    args = parser.parse_args()
    args.func(args)


if __name__ == "__main__":
    main()