import { createReadStream } from 'node:fs'
import { mkdtemp, rm, writeFile } from 'node:fs/promises'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { fileURLToPath } from 'node:url'
import { PassThrough, Readable } from 'node:stream'
import { describe, expect, it } from 'vitest'
import {
  parseWxrStream,
  WxrError,
  WxrLimitError,
  WxrParseError,
  type WxrEvent,
  type WxrItem,
} from '../src/parse/wxr-stream.js'

// mini.xml（Plan 1 夹具）：5 item（post 101 / product 111 / page 121 / attachment 201,202）
// + 2 term（31 category / 32 product_cat）；term 块在第三个 item 之后、attachment 之前。
const FIXTURE = fileURLToPath(new URL('../../../tests/fixtures/wxr/mini.xml', import.meta.url))

/** 整串一次性喂入（单 chunk 路径） */
function fromString(xml: string): Readable {
  const s = new PassThrough()
  s.end(xml)
  return s
}

/** 按字节切块喂入（跨 chunk 的 UTF-8 多字节与 token 边界路径；7 字节必拆中文与 ]]>） */
function fromStringChunked(xml: string, size = 7): Readable {
  return Readable.from(
    (function* () {
      const buf = Buffer.from(xml, 'utf8')
      for (let i = 0; i < buf.length; i += size) yield buf.subarray(i, i + size)
    })(),
  )
}

async function collect(gen: AsyncGenerator<WxrEvent>): Promise<WxrEvent[]> {
  const out: WxrEvent[] = []
  for await (const ev of gen) out.push(ev)
  return out
}

/** 捕获 reject 的错误实例（而非仅匹配），以便断言 kind / line / column 细节（照 php-unserialize 测试先例） */
async function captureRejection(p: Promise<unknown>): Promise<unknown> {
  try {
    await p
  } catch (e) {
    return e
  }
  throw new Error('期望抛出但未抛出')
}

/** 迭代到错误或完结：同时保留已交付事件与错误（审查 Fix 2 的交付确定性断言用） */
async function collectUntilError(gen: AsyncGenerator<WxrEvent>): Promise<{ events: WxrEvent[]; error: unknown }> {
  const events: WxrEvent[] = []
  try {
    for await (const ev of gen) events.push(ev)
    return { events, error: null }
  } catch (e) {
    return { events, error: e }
  }
}

function itemsOf(events: WxrEvent[]): WxrItem[] {
  return events
    .filter((ev): ev is Extract<WxrEvent, { kind: 'item' }> => ev.kind === 'item')
    .map((ev) => ev.item)
}

/** 概要签名：item:<postId>:<postType> / term:<termId>:<taxonomy>（按文档序） */
function signature(events: WxrEvent[]): string[] {
  return events.map((ev) =>
    ev.kind === 'item'
      ? `item:${ev.item.postId}:${ev.item.postType}`
      : `term:${ev.term.termId}:${ev.term.taxonomy}`,
  )
}

describe('parseWxrStream：mini.xml 流式产出', () => {
  it('产出顺序与文档一致：post → product → page → term → term → attachment → attachment', async () => {
    const events = await collect(parseWxrStream(createReadStream(FIXTURE)))
    expect(signature(events)).toStrictEqual([
      'item:101:post',
      'item:111:product',
      'item:121:page',
      'term:31:category',
      'term:32:product_cat',
      'item:201:attachment',
      'item:202:attachment',
    ])
  })

  it('跨 chunk 切块喂入（7 字节/块）产出与单 chunk 完全一致', async () => {
    const { readFileSync } = await import('node:fs')
    const xml = readFileSync(FIXTURE, 'utf8')
    const events = await collect(parseWxrStream(fromStringChunked(xml)))
    expect(signature(events)).toStrictEqual([
      'item:101:post',
      'item:111:product',
      'item:121:page',
      'term:31:category',
      'term:32:product_cat',
      'item:201:attachment',
      'item:202:attachment',
    ])
  })

  it('item 事件字段完整：post 101 逐一断言具体值', async () => {
    const events = await collect(parseWxrStream(createReadStream(FIXTURE)))
    const item = itemsOf(events).find((it) => it.postId === 101)
    expect(item).toBeDefined()
    expect(item).toMatchObject({
      postId: 101,
      postType: 'post',
      status: 'publish',
      postName: 'fixture-news-a',
      link: 'https://fixture.example/news/fixture-news-a.html',
      title: 'Fixture News A',
      contentEncoded:
        '<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>',
      excerptEncoded: 'Fixture excerpt A',
      postDate: '2026-10-05 09:00:00',
      postModified: '2026-10-06 10:00:00',
      attachmentUrl: '',
      creator: 'editor',
    })
  })

  it('attachment item：attachmentUrl 与 inherit 状态', async () => {
    const events = await collect(parseWxrStream(createReadStream(FIXTURE)))
    const a201 = itemsOf(events).find((it) => it.postId === 201)
    expect(a201).toMatchObject({
      postType: 'attachment',
      status: 'inherit',
      attachmentUrl: 'https://fixture.example/wp-content/uploads/2026/10/fixture-a.png',
    })
  })

  it('term 事件字段：term_id/taxonomy/slug/name（term 31）', async () => {
    const events = await collect(parseWxrStream(createReadStream(FIXTURE)))
    const term = events.find((ev) => ev.kind === 'term' && ev.term.termId === 31)
    expect(term).toBeDefined()
    expect(term?.kind === 'term' && term.term).toMatchObject({
      termId: 31,
      taxonomy: 'category',
      slug: 'company',
      name: 'Company',
    })
  })

  it('postmeta 聚合：post 101 恰 3 条（_thumbnail_id + Yoast title/metadesc）', async () => {
    const events = await collect(parseWxrStream(createReadStream(FIXTURE)))
    const item = itemsOf(events).find((it) => it.postId === 101)
    expect(item?.metas).toStrictEqual([
      { key: '_thumbnail_id', value: '201' },
      { key: '_yoast_wpseo_title', value: 'Fixture SEO Title A' },
      { key: '_yoast_wpseo_metadesc', value: 'Fixture SEO description A.' },
    ])
  })

  it('postmeta 聚合：product 111 恰 3 条（gallery 与 wppop_sections 原样字符串）', async () => {
    const events = await collect(parseWxrStream(createReadStream(FIXTURE)))
    const item = itemsOf(events).find((it) => it.postId === 111)
    expect(item?.metas).toStrictEqual([
      { key: '_thumbnail_id', value: '202' },
      { key: '_product_image_gallery', value: '203,204' },
      {
        key: 'wppop_sections',
        value: 'a:1:{i:0;a:2:{s:5:"title";s:8:"SpecsTab";s:7:"content";s:10:"<p>Tab</p>";}}',
      },
    ])
  })

  it('category 元素聚合进 item 事件：post 101 → category/company/Company；product 111 无', async () => {
    const events = await collect(parseWxrStream(createReadStream(FIXTURE)))
    const post101 = itemsOf(events).find((it) => it.postId === 101)
    expect(post101?.categories).toStrictEqual([{ domain: 'category', nicename: 'company', value: 'Company' }])
    const product111 = itemsOf(events).find((it) => it.postId === 111)
    expect(product111?.categories).toStrictEqual([])
  })

  it('rawLocation：wxr://item/<文档内序号从1起>，term 同理', async () => {
    const events = await collect(parseWxrStream(createReadStream(FIXTURE)))
    expect(itemsOf(events).map((it) => it.rawLocation)).toStrictEqual([
      'wxr://item/1',
      'wxr://item/2',
      'wxr://item/3',
      'wxr://item/4',
      'wxr://item/5',
    ])
    expect(
      events
        .filter((ev) => ev.kind === 'term')
        .map((ev) => (ev.kind === 'term' ? ev.term.rawLocation : '')),
    ).toStrictEqual(['wxr://term/1', 'wxr://term/2'])
  })
})

// 标题 CDATA 长 16 字符：供 maxCdataLength / maxFieldLength（=10）触发超限
const SMALL_XML = `<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:wp="http://wordpress.org/export/1.2/">
<channel>
<item><title><![CDATA[AAAAAAAAAAAAAAAA]]></title><wp:post_id>1</wp:post_id><wp:post_type>post</wp:post_type><wp:status>publish</wp:status></item>
<item><title><![CDATA[BBBBBBBBBBBBBBBB]]></title><wp:post_id>2</wp:post_id><wp:post_type>post</wp:post_type><wp:status>publish</wp:status></item>
<item><title><![CDATA[CCCCCCCCCCCCCCCC]]></title><wp:post_id>3</wp:post_id><wp:post_type>post</wp:post_type><wp:status>publish</wp:status></item>
</channel>
</rss>`

describe('parseWxrStream：限额防线（WxrLimitError，kind 区分）', () => {
  it('maxItems=2：第 3 个 item 开始前抛 kind items', async () => {
    const err = (await captureRejection(
      collect(parseWxrStream(fromString(SMALL_XML), { limits: { maxItems: 2 } })),
    )) as WxrLimitError
    expect(err).toBeInstanceOf(WxrLimitError)
    expect(err).toBeInstanceOf(WxrError)
    expect(err.kind).toBe('items')
  })

  it('maxCdataLength=10：超长 CDATA 抛 kind cdata', async () => {
    const err = (await captureRejection(
      collect(parseWxrStream(fromString(SMALL_XML), { limits: { maxCdataLength: 10 } })),
    )) as WxrLimitError
    expect(err).toBeInstanceOf(WxrLimitError)
    expect(err.kind).toBe('cdata')
    // 限额错误 message 附 saxes 行列位置（钉死，审查 Fix 6c）
    expect(err.message).toMatch(/line \d+, column \d+/)
  })

  it('超限抛错前已完成事件确定性交付：单 chunk 与 7 字节切块产出一致（审查 Fix 2）', async () => {
    const single = await collectUntilError(
      parseWxrStream(fromString(SMALL_XML), { limits: { maxItems: 2 } }),
    )
    const chunked = await collectUntilError(
      parseWxrStream(fromStringChunked(SMALL_XML), { limits: { maxItems: 2 } }),
    )
    expect(single.error).toBeInstanceOf(WxrLimitError)
    expect(chunked.error).toBeInstanceOf(WxrLimitError)
    expect(signature(single.events)).toStrictEqual(['item:1:post', 'item:2:post'])
    expect(signature(chunked.events)).toStrictEqual(['item:1:post', 'item:2:post'])
  })

  it('maxFieldLength=10：单字段累计超限抛 kind fieldLength（防单个 title 灌爆内存）', async () => {
    const err = (await captureRejection(
      collect(parseWxrStream(fromString(SMALL_XML), { limits: { maxFieldLength: 10 } })),
    )) as WxrLimitError
    expect(err).toBeInstanceOf(WxrLimitError)
    expect(err.kind).toBe('fieldLength')
  })

  it('maxDepth=2：rss>channel>item 嵌套超限抛 kind depth', async () => {
    const err = (await captureRejection(
      collect(parseWxrStream(fromString(SMALL_XML), { limits: { maxDepth: 2 } })),
    )) as WxrLimitError
    expect(err).toBeInstanceOf(WxrLimitError)
    expect(err.kind).toBe('depth')
  })

  it('timeBudgetMs：可注入时钟超预算 → kind time', async () => {
    let calls = 0
    const now = () => (calls++ === 0 ? 0 : 1_000_000) // 第 1 次取起点，其后均"超预算"
    const err = (await captureRejection(
      collect(parseWxrStream(fromString(SMALL_XML), { limits: { timeBudgetMs: 120_000 }, now })),
    )) as WxrLimitError
    expect(err).toBeInstanceOf(WxrLimitError)
    expect(err.kind).toBe('time')
  })

  it('maxTermCount=1：第 2 个 term 抛 kind terms', async () => {
    const xml = SMALL_XML.replace(
      '</channel>',
      '<wp:term><wp:term_id>1</wp:term_id><wp:term_taxonomy>category</wp:term_taxonomy><wp:term_slug>a</wp:term_slug><wp:term_name>A</wp:term_name></wp:term>' +
        '<wp:term><wp:term_id>2</wp:term_id><wp:term_taxonomy>category</wp:term_taxonomy><wp:term_slug>b</wp:term_slug><wp:term_name>B</wp:term_name></wp:term></channel>',
    )
    const err = (await captureRejection(
      collect(parseWxrStream(fromString(xml), { limits: { maxTermCount: 1 } })),
    )) as WxrLimitError
    expect(err).toBeInstanceOf(WxrLimitError)
    expect(err.kind).toBe('terms')
  })

  it('maxWxrBytes：累计字节数超限抛 kind bytes', async () => {
    const err = (await captureRejection(
      collect(parseWxrStream(fromString(SMALL_XML), { limits: { maxWxrBytes: 10 } })),
    )) as WxrLimitError
    expect(err).toBeInstanceOf(WxrLimitError)
    expect(err.kind).toBe('bytes')
  })

  it('maxMetaPerItem：单 item postmeta 数超限抛 kind metaPerItem', async () => {
    const xml = SMALL_XML.replace(
      '</item>',
      '<wp:postmeta><wp:meta_key><![CDATA[k1]]></wp:meta_key><wp:meta_value><![CDATA[v1]]></wp:meta_value></wp:postmeta>' +
        '<wp:postmeta><wp:meta_key><![CDATA[k2]]></wp:meta_key><wp:meta_value><![CDATA[v2]]></wp:meta_value></wp:postmeta></item>',
    )
    const err = (await captureRejection(
      collect(parseWxrStream(fromString(xml), { limits: { maxMetaPerItem: 1 } })),
    )) as WxrLimitError
    expect(err).toBeInstanceOf(WxrLimitError)
    expect(err.kind).toBe('metaPerItem')
  })
})

describe('parseWxrStream：外部实体防线（不解析实体、不注入替换文本、不访问网络）', () => {
  // 选定行为（钉死）：saxes 6 实体表固定为 XML 五预定义 + 数字字符引用，DOCTYPE
  // 内部/SYSTEM 实体声明一律不注册——引用即 "undefined entity." 结构错误（WxrParseError），
  // 替换文本绝不进入任何产出字段；saxes 为纯字符串解析器，外部 SYSTEM 标识符从不被抓取。
  const SECRET = 'SECRET-REPLACEMENT-TEXT'

  async function withTempEntityXml(
    doctype: string,
    body: string,
    run: (path: string) => Promise<void>,
  ): Promise<void> {
    const dir = await mkdtemp(join(tmpdir(), 'wxr-entity-'))
    const path = join(dir, 'entity.xml')
    await writeFile(
      path,
      `<?xml version="1.0" encoding="UTF-8"?>\n${doctype}\n<rss version="2.0" xmlns:wp="http://wordpress.org/export/1.2/"><channel>${body}</channel></rss>`,
      'utf8',
    )
    try {
      await run(path)
    } finally {
      await rm(dir, { recursive: true, force: true })
    }
  }

  it('DOCTYPE 内部 ENTITY：引用处抛 WxrParseError，替换文本不进产出（临时文件 + createReadStream）', async () => {
    await withTempEntityXml(
      `<!DOCTYPE rss [<!ENTITY xxe "${SECRET}">]>`,
      '<item><title>&xxe;</title><wp:post_id>1</wp:post_id><wp:post_type>post</wp:post_type></item>',
      async (path) => {
        const events: WxrEvent[] = []
        const err = (await captureRejection(
          (async () => {
            for await (const ev of parseWxrStream(createReadStream(path))) events.push(ev)
          })(),
        )) as WxrParseError
        expect(err).toBeInstanceOf(WxrParseError)
        expect(err.message).toContain('undefined entity')
        // 无论解析走到哪一步：替换文本绝不出现于任何已产出事件
        expect(JSON.stringify(events)).not.toContain(SECRET)
      },
    )
  })

  it('SYSTEM 外部实体：同样拒绝（不解析、不抓取——无任何网络 I/O）', async () => {
    await withTempEntityXml(
      '<!DOCTYPE rss [<!ENTITY ext SYSTEM "file:///etc/passwd">]>',
      '<item><title>&ext;</title><wp:post_id>1</wp:post_id><wp:post_type>post</wp:post_type></item>',
      async (path) => {
        const err = (await captureRejection(collect(parseWxrStream(createReadStream(path))))) as WxrParseError
        expect(err).toBeInstanceOf(WxrParseError)
        expect(err.message).toContain('undefined entity')
      },
    )
  })

  it('预定义实体不受影响：&amp; / 数字字符引用正常解析', async () => {
    const xml =
      '<?xml version="1.0"?><rss version="2.0" xmlns:wp="http://wordpress.org/export/1.2/"><channel>' +
      '<item><title>plain</title><wp:post_name>a&amp;b&#65;</wp:post_name><wp:post_id>7</wp:post_id><wp:post_type>post</wp:post_type></item>' +
      '</channel></rss>'
    const events = await collect(parseWxrStream(fromString(xml)))
    expect(itemsOf(events)[0]?.postName).toBe('a&bA')
  })
})

describe('parseWxrStream：畸形 XML → WxrParseError（带 saxes 行列位置）', () => {
  it('提前闭合：精确 line/column（4:17）与原始信息', async () => {
    const xml =
      '<?xml version="1.0"?>\n<rss><channel>\n<item><title>a</title></item>\n</channel></item></rss>'
    const err = (await captureRejection(collect(parseWxrStream(fromString(xml))))) as WxrParseError
    expect(err).toBeInstanceOf(WxrParseError)
    expect(err).toBeInstanceOf(WxrError)
    expect(err.line).toBe(4)
    expect(err.column).toBe(17)
    expect(err.message).toContain('unexpected close tag')
  })

  it('未闭合（截断）文件：close 阶段报错，行列为有效正数', async () => {
    const xml = '<?xml version="1.0"?>\n<rss><channel>\n<item><title>a</title></item>\n</channel>'
    const err = (await captureRejection(collect(parseWxrStream(fromString(xml))))) as WxrParseError
    expect(err).toBeInstanceOf(WxrParseError)
    expect(err.line).toBeGreaterThanOrEqual(1)
    expect(err.column).toBeGreaterThanOrEqual(0)
    expect(err.message).toContain('unclosed')
  })
})

describe('parseWxrStream：wp:post_id / wp:term_id 严格整数解析（审查 Fix 3）', () => {
  it.each([
    ['', null],
    ['0x10', null],
    ['12abc', null],
    ['-7', -7],
    ['99999999999999999999', null],
    ['101', 101],
  ])('post_id 输入 %j → %j', async (raw, expected) => {
    const xml =
      '<?xml version="1.0"?><rss version="2.0" xmlns:wp="http://wordpress.org/export/1.2/"><channel>' +
      `<item><title>t</title><wp:post_id>${raw}</wp:post_id><wp:post_type>post</wp:post_type></item>` +
      '</channel></rss>'
    const events = await collect(parseWxrStream(fromString(xml)))
    expect(itemsOf(events)[0]?.postId).toBe(expected)
  })

  it('term_id 同一规则：非纯数字 → null', async () => {
    const xml =
      '<?xml version="1.0"?><rss version="2.0" xmlns:wp="http://wordpress.org/export/1.2/"><channel>' +
      '<wp:term><wp:term_id>0x10</wp:term_id><wp:term_taxonomy>category</wp:term_taxonomy></wp:term>' +
      '</channel></rss>'
    const events = await collect(parseWxrStream(fromString(xml)))
    expect(events[0]?.kind === 'term' && events[0].term.termId).toBeNull()
  })
})

describe('parseWxrStream：嵌套畸形 fail-fast（审查 Fix 4）', () => {
  it('item 内嵌 item：立即 WxrParseError，外层不被截断产出', async () => {
    const xml =
      '<?xml version="1.0"?><rss version="2.0" xmlns:wp="http://wordpress.org/export/1.2/"><channel>' +
      '<item><title>outer</title><wp:post_id>1</wp:post_id><wp:post_type>post</wp:post_type>' +
      '<item><wp:post_id>2</wp:post_id><wp:post_type>post</wp:post_type></item>' +
      '</item></channel></rss>'
    const { events, error } = await collectUntilError(parseWxrStream(fromString(xml)))
    expect(error).toBeInstanceOf(WxrParseError)
    expect((error as WxrParseError).message).toContain('嵌套')
    expect(events).toStrictEqual([]) // 嵌套发生在 item 中途——错误前无已完成事件
  })

  it('wp:term 内嵌 wp:term：同样 fail-fast', async () => {
    const xml =
      '<?xml version="1.0"?><rss version="2.0" xmlns:wp="http://wordpress.org/export/1.2/"><channel>' +
      '<wp:term><wp:term_id>1</wp:term_id><wp:term_taxonomy>category</wp:term_taxonomy>' +
      '<wp:term><wp:term_id>2</wp:term_id></wp:term>' +
      '</wp:term></channel></rss>'
    const err = (await captureRejection(collect(parseWxrStream(fromString(xml))))) as WxrParseError
    expect(err).toBeInstanceOf(WxrParseError)
    expect(err.message).toContain('嵌套')
  })
})

describe('parseWxrStream：流契约钉死（审查 Fix 6）', () => {
  it('消费方提前 break：上游流被销毁（finally 兜底契约）', async () => {
    const stream = fromString(SMALL_XML)
    for await (const _ev of parseWxrStream(stream)) {
      break // 收到首个事件即退出
    }
    expect(stream.destroyed).toBe(true)
  })

  it('text 与 CDATA 混合内容累计为同一字段值', async () => {
    const xml =
      '<?xml version="1.0"?><rss version="2.0" xmlns:wp="http://wordpress.org/export/1.2/"><channel>' +
      '<item><title>pre<![CDATA[mid]]>post</title><wp:post_id>5</wp:post_id><wp:post_type>post</wp:post_type></item>' +
      '</channel></rss>'
    const events = await collect(parseWxrStream(fromString(xml)))
    expect(itemsOf(events)[0]?.title).toBe('premidpost')
  })
})