import { createReadStream } from 'node:fs'
import { fileURLToPath } from 'node:url'
import { describe, expect, it } from 'vitest'
import { isUniversalRow, type UniversalRow } from '@sf/contracts'
import { parseWxrStream, type WxrItem } from '../src/parse/wxr-stream.js'
import {
  DEFAULT_TYPE_ROUTES,
  mapItem,
  META_KEYS,
  STATUS_MAP,
  UNKNOWN_STATUS,
  type MapConfig,
  type MappedResult,
} from '../src/map/item-to-row.js'

// mini.xml（Plan 1 夹具）：5 item（post 101 / product 111 / page 121 / attachment 201,202）
// + 2 term；product 的图库 203/204 有意悬空（夹具中不存在对应 attachment item）。
const FIXTURE = fileURLToPath(new URL('../../../tests/fixtures/wxr/mini.xml', import.meta.url))

const CONFIG: MapConfig = { locale: 'zh-CN' }

/** 经 parseWxrStream 喂 mini.xml 取真实 item 事件（端到端：解析产物即映射输入） */
async function miniItems(): Promise<WxrItem[]> {
  const out: WxrItem[] = []
  for await (const ev of parseWxrStream(createReadStream(FIXTURE))) {
    if (ev.kind === 'item') out.push(ev.item)
  }
  return out
}

function byPostId(items: WxrItem[], postId: number): WxrItem {
  const found = items.find((it) => it.postId === postId)
  if (found === undefined) throw new Error(`mini.xml 中找不到 post ${postId}`)
  return found
}

/** 手构等值 WxrItem（任务说明允许：wxr-stream 完整字段形状，缺省为最平凡合法值） */
function makeItem(overrides: Partial<WxrItem> = {}): WxrItem {
  return {
    rawLocation: 'wxr://item/handmade',
    postId: 1,
    postType: 'post',
    status: 'publish',
    postName: 'handmade',
    link: 'https://example.com/handmade.html',
    title: 'Handmade',
    contentEncoded: '<p>handmade body</p>',
    excerptEncoded: '',
    postDate: '2026-01-01 00:00:00',
    postModified: '2026-01-02 00:00:00',
    attachmentUrl: '',
    creator: 'admin',
    metas: [],
    categories: [],
    ...overrides,
  }
}

/** 断言结果为 row 并取出（ narrowing 辅助；非 row 即失败） */
function rowOf(result: MappedResult): { row: UniversalRow; issues: string[] } {
  if (result.kind !== 'row') throw new Error(`期望 kind:'row'，实际 ${result.kind}`)
  return { row: result.row, issues: result.issues }
}

/** Plan 1 移交 property 断言：产出 row 的通用不变量（守卫 + 非空 + refs 形状） */
function expectRowInvariants(row: UniversalRow): void {
  expect(isUniversalRow(row)).toBe(true)
  expect(row.sourceType).not.toBe('')
  expect(row.sourceId).not.toBe('')
  expect(row.rawLocation).not.toBe('')
  for (const ref of row.taxonomyRefs) {
    expect(ref.taxonomy).not.toBe('')
    expect(ref.sourceTermId).not.toBe('')
  }
  for (const ref of row.attachmentRefs) {
    expect(ref.role).not.toBe('')
    // 本映射器产出的 ref 一律以 sourceId 锚定（不产 sourceUrl 型 ref）
    expect(typeof ref.sourceId === 'string' && ref.sourceId !== '').toBe(true)
  }
}

/** extras 为 null 原型字典（原型污染防御，审查 Fix 4）：展开为普通对象再作整体等值比较 */
function plain(extras: Record<string, unknown>): Record<string, unknown> {
  return { ...extras }
}

describe('mapItem：mini.xml 端到端（parseWxrStream → mapItem）', () => {
  it('post(101)：全字段映射（路由/status/locale/slug/seo/taxonomyRefs/featured/knownFields/bodyHtml 原文）', async () => {
    const { row, issues } = rowOf(mapItem(byPostId(await miniItems(), 101), CONFIG))
    expect(issues).toStrictEqual([])
    expect(row).toMatchObject({
      sourceType: 'wp:post',
      sourceId: '101',
      status: 'publish',
      locale: 'zh-CN',
      sourceUrl: 'https://fixture.example/news/fixture-news-a.html',
      slug: 'fixture-news-a',
      // 原文透传（清洗是 Task 5 的职责）
      bodyHtml:
        '<p>Body with <a href="/products/fixture-product/">link</a> and <img src="https://fixture.example/wp-content/uploads/2026/10/fixture-a.png"/></p>',
      rawLocation: 'wxr://item/1',
    })
    // 设计决定（JSDoc 钉死）：sourceTermId 暂以 category @nicename 为锚
    // （= 真实 WP 的 term slug；mini.xml 中 term 31 的 slug 恰为 'company'，Task 8 实数据核对后冻结）
    expect(row.taxonomyRefs).toStrictEqual([{ taxonomy: 'category', sourceTermId: 'company' }])
    expect(row.attachmentRefs).toStrictEqual([{ role: 'featured', sourceId: '201' }])
    expect(row.seo).toStrictEqual({
      title: 'Fixture SEO Title A',
      description: 'Fixture SEO description A.',
    })
    // 阶段 3 提升纪律：title/日期暂留 knownFields（键名冻结为 title/postDate/postModified）
    expect(row.knownFields).toStrictEqual({
      title: 'Fixture News A',
      postDate: '2026-10-05 09:00:00',
      postModified: '2026-10-06 10:00:00',
      excerpt: 'Fixture excerpt A',
      creator: 'editor',
    })
    // 101 的 3 条 meta 全部被分流（thumbnail/yoast×2）——extras 无未识别残余
    expect(plain(row.extras)).toStrictEqual({})
    expectRowInvariants(row)
  })

  it('product(111)：featured 202 + 悬空 gallery 203/204 原样保留（歧义不猜）；extras.wppop_sections 为解析产物', async () => {
    const { row, issues } = rowOf(mapItem(byPostId(await miniItems(), 111), CONFIG))
    expect(issues).toStrictEqual([])
    expect(row.sourceType).toBe('wp:product')
    expect(row.sourceId).toBe('111')
    // 悬空 203/204 原样保留：是否存在对应媒体是入库阶段以全量数据才能裁决的事
    expect(row.attachmentRefs).toStrictEqual([
      { role: 'featured', sourceId: '202' },
      { role: 'gallery', sourceId: '203' },
      { role: 'gallery', sourceId: '204' },
    ])
    // Map 陷阱防线：必须是 phpValueToJson 后的普通对象（可 JSON.stringify，非 Map）
    expect(row.extras.wppop_sections).not.toBeInstanceOf(Map)
    expect(row.extras.wppop_sections).toStrictEqual([{ title: 'SpecsTab', content: '<p>Tab</p>' }])
    expect(JSON.stringify(row.extras.wppop_sections)).toBe('[{"title":"SpecsTab","content":"<p>Tab</p>"}]')
    expectRowInvariants(row)
  })

  it('page(121)：sourceType wp:page，seo/refs 为空', async () => {
    const { row } = rowOf(mapItem(byPostId(await miniItems(), 121), CONFIG))
    expect(row.sourceType).toBe('wp:page')
    expect(row.sourceId).toBe('121')
    expect(row.taxonomyRefs).toStrictEqual([])
    expect(row.attachmentRefs).toStrictEqual([])
    expect(row.seo).toStrictEqual({})
    expectRowInvariants(row)
  })

  it('attachment(201)：sourceType wp:attachment、status inherit 原样、knownFields.attachmentUrl', async () => {
    const { row, issues } = rowOf(mapItem(byPostId(await miniItems(), 201), CONFIG))
    expect(issues).toStrictEqual([])
    expect(row.sourceType).toBe('wp:attachment')
    expect(row.sourceId).toBe('201')
    expect(row.status).toBe('inherit')
    expect(row.knownFields.attachmentUrl).toBe(
      'https://fixture.example/wp-content/uploads/2026/10/fixture-a.png',
    )
    expectRowInvariants(row)
  })

  it('property 断言（Plan 1 移交）：mini.xml 全部 5 item 均产合法 row（含 attachment 202）', async () => {
    const items = await miniItems()
    expect(items).toHaveLength(5)
    for (const item of items) {
      const { row } = rowOf(mapItem(item, CONFIG))
      expectRowInvariants(row)
    }
  })
})

describe('mapItem：unsupported 分流（不产 row）', () => {
  it.each(['nav_menu_item', 'wpcf7_contact_form', 'elementor_library', 'wp_navigation'])(
    'post_type %s → {kind:unsupported, sourceType:wp:%s}，不产 row',
    (postType) => {
      const result = mapItem(makeItem({ postType }), CONFIG)
      expect(result).toStrictEqual({
        kind: 'unsupported',
        sourceType: `wp:${postType}`,
        reason: 'post_type 未配置映射',
        rawLocation: 'wxr://item/handmade',
      })
      expect('row' in result).toBe(false)
    },
  )

  it('typeRoutes 自定义：整体替换语义（post 走自定义路由；product 无路由 → unsupported）', () => {
    const custom: MapConfig = { locale: 'zh-CN', typeRoutes: { post: 'site:article' } }
    const post = rowOf(mapItem(makeItem({ postType: 'post' }), custom))
    expect(post.row.sourceType).toBe('site:article')
    expect(mapItem(makeItem({ postType: 'product' }), custom).kind).toBe('unsupported')
  })
})

describe('mapItem：status 值域映射（Plan 1 移交，表驱动）', () => {
  it.each(['publish', 'draft', 'future', 'pending', 'private', 'trash', 'inherit'])(
    '已知 status %s → 原样',
    (status) => {
      const { row, issues } = rowOf(mapItem(makeItem({ status }), CONFIG))
      expect(row.status).toBe(status)
      expect(issues).toStrictEqual([])
    },
  )

  it("未知 status（'weird'/空串）→ 'unknown' + issue（不猜不丢）", () => {
    const weird = rowOf(mapItem(makeItem({ status: 'weird' }), CONFIG))
    expect(weird.row.status).toBe('unknown')
    expect(weird.issues).toStrictEqual([`status 值未识别："weird"，已映射为 'unknown'`])
    const empty = rowOf(mapItem(makeItem({ status: '' }), CONFIG))
    expect(empty.row.status).toBe('unknown')
    expect(empty.issues).toHaveLength(1)
  })

  it('STATUS_MAP/DEFAULT_TYPE_ROUTES/META_KEYS 冻结且值域钉死', () => {
    expect(Object.isFrozen(STATUS_MAP)).toBe(true)
    expect(Object.isFrozen(DEFAULT_TYPE_ROUTES)).toBe(true)
    expect(Object.isFrozen(META_KEYS)).toBe(true)
    expect(STATUS_MAP).toStrictEqual({
      publish: 'publish',
      draft: 'draft',
      future: 'future',
      pending: 'pending',
      private: 'private',
      trash: 'trash',
      inherit: 'inherit',
    })
    expect(UNKNOWN_STATUS).toBe('unknown')
    expect(DEFAULT_TYPE_ROUTES).toStrictEqual({
      post: 'wp:post',
      page: 'wp:page',
      product: 'wp:product',
      attachment: 'wp:attachment',
    })
    expect(META_KEYS).toStrictEqual({
      thumbnail: '_thumbnail_id',
      gallery: '_product_image_gallery',
      seoTitle: '_yoast_wpseo_title',
      seoDescription: '_yoast_wpseo_metadesc',
      wppopSections: 'wppop_sections',
    })
  })
})

describe('mapItem：postId 异常策略（Task 3 审查移交）', () => {
  it('postId null → {kind:error}（不产 row 不猜）', () => {
    expect(mapItem(makeItem({ postId: null }), CONFIG)).toStrictEqual({
      kind: 'error',
      issue: 'post_id 缺失或非法',
      rawLocation: 'wxr://item/handmade',
    })
  })

  it("postId -7（wxr-stream 严格解析 '-7' 的产物）→ sourceId '-7' 原样", () => {
    const { row } = rowOf(mapItem(makeItem({ postId: -7 }), CONFIG))
    expect(row.sourceId).toBe('-7')
  })

  it("postId -0 / 0 → sourceId '0'（-0 归一，String(-0)==='0'）", () => {
    const item = makeItem({ postId: -0 })
    expect(Object.is(item.postId, -0)).toBe(true) // 确证喂入的确实是 -0（未被字面量归一）
    expect(rowOf(mapItem(item, CONFIG)).row.sourceId).toBe('0')
    expect(rowOf(mapItem(makeItem({ postId: 0 }), CONFIG)).row.sourceId).toBe('0')
  })

  it('post_id 缺失的 unsupported 类型：data 有效性先行于路由（error 而非 unsupported）', () => {
    const result = mapItem(makeItem({ postId: null, postType: 'nav_menu_item' }), CONFIG)
    expect(result.kind).toBe('error')
  })
})

describe('mapItem：meta 分流表', () => {
  it('未识别 meta → extras 原样（字符串键值；同 key 后者覆盖前者）', () => {
    const { row, issues } = rowOf(
      mapItem(
        makeItem({
          metas: [
            { key: 'custom_a', value: 'va' },
            { key: '_thumbnail_id', value: '301' },
            { key: 'custom_a', value: 'va-2' },
            { key: 'custom_b', value: 'vb' },
          ],
        }),
        CONFIG,
      ),
    )
    expect(issues).toStrictEqual([])
    expect(plain(row.extras)).toStrictEqual({ custom_a: 'va-2', custom_b: 'vb' })
    expect(row.attachmentRefs).toStrictEqual([{ role: 'featured', sourceId: '301' }])
  })

  it('thumbnail/gallery 容忍空白（trim）；空 gallery 值不产 ref；空 thumbnail 记 issue', () => {
    const ok = rowOf(
      mapItem(
        makeItem({
          metas: [
            { key: '_thumbnail_id', value: ' 401 ' },
            { key: '_product_image_gallery', value: '402 ,  403' },
          ],
        }),
        CONFIG,
      ),
    )
    expect(ok.row.attachmentRefs).toStrictEqual([
      { role: 'featured', sourceId: '401' },
      { role: 'gallery', sourceId: '402' },
      { role: 'gallery', sourceId: '403' },
    ])
    // WooCommerce 语义：空 _product_image_gallery = 无图库（不报 issue）；空 _thumbnail_id 为畸形（记 issue）
    const emptyGallery = rowOf(
      mapItem(makeItem({ metas: [{ key: '_product_image_gallery', value: '' }] }), CONFIG),
    )
    expect(emptyGallery.row.attachmentRefs).toStrictEqual([])
    expect(emptyGallery.issues).toStrictEqual([])
    const emptyThumb = rowOf(
      mapItem(makeItem({ metas: [{ key: '_thumbnail_id', value: '  ' }] }), CONFIG),
    )
    expect(emptyThumb.row.attachmentRefs).toStrictEqual([])
    expect(emptyThumb.issues).toStrictEqual(['meta _thumbnail_id 值为空，featured 引用已跳过'])
  })

  it('wppop 解析失败路径：extras.phpRaw 存原串 + issue（不崩不丢，row 照常产出）', () => {
    const raw = 'a:1:{i:0;s:5:"ab' // 截断串 → PhpParseError
    const { row, issues } = rowOf(
      mapItem(makeItem({ metas: [{ key: 'wppop_sections', value: raw }] }), CONFIG),
    )
    expect(row.extras.phpRaw).toBe(raw)
    expect(row.extras.wppop_sections).toBeUndefined()
    expect(issues).toHaveLength(1)
    expect(issues[0]).toContain('wppop_sections')
    expect(issues[0]).toContain('phpRaw')
    expectRowInvariants(row)
  })
})

describe('mapItem：category 引用形状防线', () => {
  it('category 缺 domain 或 nicename → 跳过该 ref 并记 issue（不产空锚点）', () => {
    const { row, issues } = rowOf(
      mapItem(
        makeItem({
          categories: [
            { domain: 'category', nicename: '', value: 'X' },
            { domain: '', nicename: 'slug', value: 'Y' },
            { domain: 'post_tag', nicename: 'tag-a', value: 'TagA' },
          ],
        }),
        CONFIG,
      ),
    )
    expect(row.taxonomyRefs).toStrictEqual([{ taxonomy: 'post_tag', sourceTermId: 'tag-a' }])
    expect(issues).toHaveLength(2)
    expectRowInvariants(row)
  })
})

describe('mapItem：原型键防御（审查 Fix 1——裸索引会命中继承属性）', () => {
  it("postType 'constructor'（继承键，值为函数非路由）→ unsupported，不被当合法路由命中", () => {
    const result = mapItem(makeItem({ postType: 'constructor' }), CONFIG)
    expect(result).toStrictEqual({
      kind: 'unsupported',
      sourceType: 'wp:constructor',
      reason: 'post_type 未配置映射',
      rawLocation: 'wxr://item/handmade',
    })
  })

  it("status 'valueOf'（继承键，值为函数非字符串）→ 'unknown' + issue", () => {
    const { row, issues } = rowOf(mapItem(makeItem({ status: 'valueOf' }), CONFIG))
    expect(row.status).toBe('unknown')
    expect(issues).toStrictEqual([`status 值未识别："valueOf"，已映射为 'unknown'`])
  })

  it("typeRoutes 自定义表同样守卫：'toString' 键未被显式配置 → unsupported", () => {
    const custom: MapConfig = { locale: 'zh-CN', typeRoutes: { post: 'wp:post' } }
    expect(mapItem(makeItem({ postType: 'toString' }), custom).kind).toBe('unsupported')
  })
})

describe('mapItem：meta 冲突策略三方统一（审查 Fix 3）', () => {
  it('单值键重复（thumbnail/seoTitle/seoDescription）→ 先者胜出 + issue（WP 单值语义）', () => {
    const { row, issues } = rowOf(
      mapItem(
        makeItem({
          metas: [
            { key: '_thumbnail_id', value: '501' },
            { key: '_thumbnail_id', value: '502' },
            { key: '_yoast_wpseo_title', value: 'T1' },
            { key: '_yoast_wpseo_title', value: 'T2' },
            { key: '_yoast_wpseo_metadesc', value: 'D1' },
            { key: '_yoast_wpseo_metadesc', value: 'D2' },
          ],
        }),
        CONFIG,
      ),
    )
    expect(row.attachmentRefs).toStrictEqual([{ role: 'featured', sourceId: '501' }])
    expect(row.seo).toStrictEqual({ title: 'T1', description: 'D1' })
    expect(issues).toStrictEqual([
      'meta _thumbnail_id 重复，取先者',
      'meta _yoast_wpseo_title 重复，取先者',
      'meta _yoast_wpseo_metadesc 重复，取先者',
    ])
  })

  it('首个单值键即便值非法也占位：后续同键值不顶替（重复即异常，显式报告不猜）', () => {
    const { row, issues } = rowOf(
      mapItem(
        makeItem({
          metas: [
            { key: '_thumbnail_id', value: '' },
            { key: '_thumbnail_id', value: '503' },
          ],
        }),
        CONFIG,
      ),
    )
    expect(row.attachmentRefs).toStrictEqual([])
    expect(issues).toStrictEqual([
      'meta _thumbnail_id 值为空，featured 引用已跳过',
      'meta _thumbnail_id 重复，取先者',
    ])
  })

  it('wppop 先败后成：extras.phpRaw 被清除、终态为成功产物（issues 留痕不回滚）', () => {
    const { row, issues } = rowOf(
      mapItem(
        makeItem({
          metas: [
            { key: 'wppop_sections', value: 'a:1:{i:0;s:5:"ab' }, // 截断 → 失败
            { key: 'wppop_sections', value: 'a:1:{i:0;s:3:"foo";}' }, // 成功
          ],
        }),
        CONFIG,
      ),
    )
    expect(Object.hasOwn(row.extras, 'phpRaw')).toBe(false)
    expect(row.extras.wppop_sections).toStrictEqual(['foo'])
    expect(issues).toHaveLength(1) // 首次失败仍在 issue 日志中
  })

  it('wppop 先成后败：对称清理——终态 phpRaw、无 wppop_sections 残留', () => {
    const bad = 'a:1:{i:0;s:5:"ab'
    const { row } = rowOf(
      mapItem(
        makeItem({
          metas: [
            { key: 'wppop_sections', value: 'a:1:{i:0;s:3:"foo";}' },
            { key: 'wppop_sections', value: bad },
          ],
        }),
        CONFIG,
      ),
    )
    expect(Object.hasOwn(row.extras, 'wppop_sections')).toBe(false)
    expect(row.extras.phpRaw).toBe(bad)
  })

  it('gallery 累积语义：两段 gallery meta 的引用按文档序并入（不属单值冲突策略）', () => {
    const { row, issues } = rowOf(
      mapItem(
        makeItem({
          metas: [
            { key: '_product_image_gallery', value: '601' },
            { key: '_product_image_gallery', value: '602,603' },
          ],
        }),
        CONFIG,
      ),
    )
    expect(row.attachmentRefs).toStrictEqual([
      { role: 'gallery', sourceId: '601' },
      { role: 'gallery', sourceId: '602' },
      { role: 'gallery', sourceId: '603' },
    ])
    expect(issues).toStrictEqual([])
  })
})

describe('mapItem：原型污染防御（审查 Fix 4）', () => {
  it("meta key '__proto__' 不静默丢失：extras 保留为自有可枚举键（null 原型字典）", () => {
    const { row, issues } = rowOf(
      mapItem(makeItem({ metas: [{ key: '__proto__', value: 'proto-v' }] }), CONFIG),
    )
    expect(issues).toStrictEqual([])
    expect(Object.hasOwn(row.extras, '__proto__')).toBe(true)
    expect(row.extras['__proto__']).toBe('proto-v')
    expect(JSON.stringify(row.extras)).toContain('"__proto__":"proto-v"')
    expectRowInvariants(row) // 守卫（含 seo/knownFields/extras 对象形状检查）仍通过
  })
})

describe('mapItem：config 校验（审查 Fix 5）', () => {
  it('typeRoutes 含空字符串路由值 → TypeError（程序员错误，fail fast）', () => {
    expect(() => mapItem(makeItem(), { locale: 'zh-CN', typeRoutes: { post: '' } })).toThrow(TypeError)
    expect(() =>
      mapItem(makeItem(), { locale: 'zh-CN', typeRoutes: { post: 'wp:post', page: '' } }),
    ).toThrow(/typeRoutes/)
  })

  it('非空路由值不误伤：合法自定义表正常产出', () => {
    expect(() =>
      rowOf(mapItem(makeItem(), { locale: 'zh-CN', typeRoutes: { post: 'wp:post' } })),
    ).not.toThrow()
  })
})