/**
 * 生成小程序用 DIY bridge（静态 v-if，禁止 <component :is>）
 *
 * target:
 *   app   -> diy-dynamic-bridge-app（框架 app 微页面）
 *   addon -> diy-dynamic-bridge-{key}（单插件微页面，供 zip 合并）
 *   router-> diy-dynamic-bridge.router（开发期 vue router，mp-core 用原生模板）
 */
const fs = require('fs')
const path = require('path')
const { ROOT, BUILD_DIR } = require('./addon-utils.cjs')
const { scanAllDiyComponents } = require('./diy-component-scan.cjs')

const REGISTRY_JSON = path.join(BUILD_DIR, 'diy-component-registry.json')

function importPath(entry) {
    if (entry.scope === 'app') {
        return `@/app/components/diy/${entry.folder}/index.vue`
    }
    return `@/addon/${entry.addonKey}/components/diy/${entry.folder}/index.vue`
}

function resolveOutputPath(options = {}) {
    if (options.target === 'app' || options.appOnly) {
        return path.join(ROOT, 'src/components/diy-dynamic-bridge-app/diy-dynamic-bridge-app.mp.vue')
    }
    if (options.target === 'addon' && options.addonKey) {
        const key = options.addonKey
        return path.join(ROOT, `src/components/diy-dynamic-bridge-${key}/diy-dynamic-bridge-${key}.mp.vue`)
    }
    if (options.target === 'router') {
        return path.join(ROOT, 'src/components/diy-dynamic-bridge/diy-dynamic-bridge.router.mp.vue')
    }
    return path.join(ROOT, 'src/components/diy-dynamic-bridge/diy-dynamic-bridge.mp.vue')
}

function loadComponents(options = {}) {
    if (options.target === 'app' || options.appOnly) {
        return scanAllDiyComponents(options).app
    }
    if (options.target === 'addon' && options.addonKey) {
        return scanAllDiyComponents({ addonKeys: [options.addonKey] }).addon
    }
    if (options.target === 'router') {
        return []
    }
    if (options.addonKeys && options.addonKeys.length) {
        const { app, addon } = scanAllDiyComponents({ addonKeys: options.addonKeys })
        return [...app, ...addon].sort((a, b) => a.vueComponentName.localeCompare(b.vueComponentName))
    }
    if (fs.existsSync(REGISTRY_JSON)) {
        const data = JSON.parse(fs.readFileSync(REGISTRY_JSON, 'utf-8'))
        if (Array.isArray(data.components) && data.components.length) {
            return data.components
        }
    }
    return scanAllDiyComponents(options).all
}

function buildBridgeVue(components) {
    const imports = components
        .map((entry) => `import ${entry.vueComponentName} from '${importPath(entry)}'`)
        .join('\n')

    const blocks = components
        .map(
            (entry) => `        <${entry.vueComponentName}
            v-if="componentName === '${entry.vueComponentName}'"
            :ref="setInnerRef"
            :component="component"
            :global="global"
            :index="index"
            :scrollBool="scrollBool"
            @update:componentIsShow="emit('update:componentIsShow', $event)"
            @loadingFn="emit('loadingFn', $event)"
        />`
        )
        .join('\n')

    return `<!-- AUTO-GENERATED by generate-diy-dynamic-bridge-mp.cjs — do not edit -->
<template>
    <view v-if="componentName">
${blocks}
    </view>
</template>

<script setup lang="ts">
import { shallowRef, watch } from 'vue'
import { resolveDiyMeta } from '@/utils/diy-component-registry'

${imports}

const emit = defineEmits<{
    'update:componentIsShow': [value: boolean]
    loadingFn: [value: unknown]
}>()

const props = defineProps<{
    componentName?: string
    component?: object
    global?: object
    index?: number
    scrollBool?: number
}>()

const innerRef = shallowRef<any>(null)

function setInnerRef(el: any) {
    innerRef.value = el
}

function warnIfUnknown() {
    const name = props.componentName || ''
    if (!name) return
    if (!resolveDiyMeta(name)) {
        console.warn('[diy-dynamic-bridge] unknown componentName:', name)
    }
}

watch(() => props.componentName, warnIfUnknown, { immediate: true })

defineExpose({
    getInnerRef: () => innerRef.value
})
</script>
`
}

function buildRouterVue() {
    return `<!-- AUTO-GENERATED router by generate-diy-dynamic-bridge-mp.cjs -->
<template>
    <view v-if="componentName">
        <diy-dynamic-bridge-app
            v-if="routeBridge === 'app'"
            :ref="setInnerRef"
            :componentName="componentName"
            :component="component"
            :global="global"
            :index="index"
            :scrollBool="scrollBool"
            @update:componentIsShow="emit('update:componentIsShow', $event)"
            @loadingFn="emit('loadingFn', $event)"
        />
        <!-- MP_MERGE_ADDON_BRIDGE_VUE -->
    </view>
</template>

<script setup lang="ts">
import { computed, shallowRef } from 'vue'
import { resolveDiyMeta } from '@/utils/diy-component-registry'

const emit = defineEmits<{
    'update:componentIsShow': [value: boolean]
    loadingFn: [value: unknown]
}>()

const props = defineProps<{
    componentName?: string
    component?: object
    global?: object
    index?: number
    scrollBool?: number
}>()

const innerRef = shallowRef<any>(null)

function setInnerRef(el: any) {
    innerRef.value = el
}

const routeBridge = computed(() => {
    const meta = resolveDiyMeta(props.componentName || '')
    return meta?.addonKey || 'app'
})

defineExpose({
    getInnerRef: () => innerRef.value
})
</script>
`
}

function ensureBridgeShells(options = {}) {
    const appVue = path.join(ROOT, 'src/components/diy-dynamic-bridge-app/diy-dynamic-bridge-app.vue')
    fs.mkdirSync(path.dirname(appVue), { recursive: true })
    if (!fs.existsSync(appVue)) {
        fs.writeFileSync(
            appVue,
            `<!-- MP: injected from diy-dynamic-bridge-app.mp.vue -->\n<template><view /></template>\n<script setup lang="ts"></script>\n`,
            'utf-8'
        )
    }

    if (options.addonKey) {
        const key = options.addonKey
        const addonVue = path.join(ROOT, `src/components/diy-dynamic-bridge-${key}/diy-dynamic-bridge-${key}.vue`)
        fs.mkdirSync(path.dirname(addonVue), { recursive: true })
        fs.writeFileSync(
            addonVue,
            `<!-- AUTO-GENERATED stub for addon bridge ${key} -->\n<template><view v-if="componentName" /></template>\n<script setup lang="ts"></script>\n`,
            'utf-8'
        )
    }
}

function describeScope(options, count) {
    if (options.target === 'app' || options.appOnly) return `app-only (${count})`
    if (options.target === 'addon' && options.addonKey) return `addon/${options.addonKey} (${count})`
    if (options.target === 'router') return 'router'
    if (options.addonKeys?.length) return `app + ${options.addonKeys.join(', ')} (${count})`
    return `full registry (${count})`
}

function generateDiyDynamicBridgeMp(options = {}) {
    ensureBridgeShells(options)
    const outPath = resolveOutputPath(options)
    const vue =
        options.target === 'router'
            ? buildRouterVue()
            : buildBridgeVue(loadComponents(options))

    fs.mkdirSync(path.dirname(outPath), { recursive: true })
    fs.writeFileSync(outPath, vue, 'utf-8')

    const count = options.target === 'router' ? 0 : loadComponents(options).length
    console.log(
        `[generate-diy-dynamic-bridge-mp] ${describeScope(options, count)} -> ${path.relative(ROOT, outPath)}`
    )
    return outPath
}

module.exports = {
    generateDiyDynamicBridgeMp,
    resolveOutputPath,
    ensureBridgeShells,
    OUT_VUE: path.join(ROOT, 'src/components/diy-dynamic-bridge/diy-dynamic-bridge.mp.vue')
}

if (require.main === module) {
    const { generateDiyRegistry } = require('./generate-diy-registry.cjs')
    generateDiyRegistry()
    generateDiyDynamicBridgeMp()
}