import { describe, it, expect } from 'vitest'
import {
  buildArgs,
  parseExtraArgs,
  formatCommandLine,
  CROP_SQUARE_PPA,
  ARIA2C_ARGS,
  type AccessOptions
} from '../src/main/buildArgs'
import {
  DEFAULT_DOWNLOAD_OPTIONS,
  type DownloadOptions,
  type StartDownloadOptions
} from '@shared/ipc'

// --- Fixtures ---------------------------------------------------------------

const BIN = 'C:/fake/bin'
const OUT = 'C:/out/%(title)s.%(ext)s'
const URL = 'https://www.youtube.com/watch?v=dQw4w9WgXcQ'
const NO_ACCESS: AccessOptions = { proxy: '', rateLimit: '', restrictFilenames: false }

function opts(overrides: Partial<StartDownloadOptions> = {}): StartDownloadOptions {
  return { id: 't', url: URL, kind: 'video', quality: '1080p', ...overrides }
}
function audio(overrides: Partial<StartDownloadOptions> = {}): StartDownloadOptions {
  return opts({ kind: 'audio', quality: 'Best (MP3)', ...overrides })
}
function dlo(overrides: Partial<DownloadOptions> = {}): DownloadOptions {
  return { ...DEFAULT_DOWNLOAD_OPTIONS, ...overrides }
}
function build(
  o: StartDownloadOptions,
  d: DownloadOptions,
  access: AccessOptions = NO_ACCESS,
  extraArgs: string[] = []
): string[] {
  return buildArgs(o, OUT, d, BIN, access, extraArgs)
}

/** True when `seq` appears as a contiguous run inside `argv`. */
function hasSeq(argv: string[], ...seq: string[]): boolean {
  if (seq.length === 0) return true
  for (let i = 0; i + seq.length <= argv.length; i++) {
    if (seq.every((s, j) => argv[i + j] === s)) return true
  }
  return false
}

// --- Invariants shared by every recipe --------------------------------------

describe('buildArgs scaffolding', () => {
  it('pins ffmpeg location to the supplied binDir', () => {
    expect(hasSeq(build(opts(), dlo()), '--ffmpeg-location', BIN)).toBe(true)
  })

  it('terminates options with `--` immediately before the URL', () => {
    const argv = build(opts(), dlo())
    expect(argv[argv.length - 2]).toBe('--')
    expect(argv[argv.length - 1]).toBe(URL)
  })
})

// --- Network: proxy / rate limit / aria2c -----------------------------------

describe('network options', () => {
  it('emits nothing when proxy/rateLimit are empty and aria2c is unset', () => {
    const argv = build(opts(), dlo(), NO_ACCESS)
    expect(argv).not.toContain('--proxy')
    expect(argv).not.toContain('--limit-rate')
    expect(argv).not.toContain('--downloader')
  })

  it('emits --proxy with the trimmed value', () => {
    const argv = build(opts(), dlo(), { ...NO_ACCESS, proxy: '  socks5://127.0.0.1:1080  ' })
    expect(hasSeq(argv, '--proxy', 'socks5://127.0.0.1:1080')).toBe(true)
  })

  it('emits --limit-rate with the trimmed value', () => {
    const argv = build(opts(), dlo(), { ...NO_ACCESS, rateLimit: ' 2M ' })
    expect(hasSeq(argv, '--limit-rate', '2M')).toBe(true)
  })

  it('emits --downloader <path> --downloader-args when an aria2c path is given', () => {
    const argv = build(opts(), dlo(), { ...NO_ACCESS, aria2cPath: 'C:/fake/bin/aria2c.exe' })
    expect(hasSeq(argv, '--downloader', 'C:/fake/bin/aria2c.exe', '--downloader-args', ARIA2C_ARGS)).toBe(
      true
    )
  })

  it('omits --downloader when aria2cPath is not set', () => {
    const argv = build(opts(), dlo(), NO_ACCESS)
    expect(argv).not.toContain('--downloader-args')
  })
})

// --- Cookies: browser store vs. sign-in window's exported file --------------

describe('cookies', () => {
  it('emits nothing when no cookie source is configured', () => {
    const argv = build(opts(), dlo(), NO_ACCESS)
    expect(argv).not.toContain('--cookies-from-browser')
    expect(argv).not.toContain('--cookies')
  })

  it('emits --cookies-from-browser <name> when cookiesFromBrowser is set', () => {
    const argv = build(opts(), dlo(), { ...NO_ACCESS, cookiesFromBrowser: 'firefox' })
    expect(hasSeq(argv, '--cookies-from-browser', 'firefox')).toBe(true)
    expect(argv).not.toContain('--cookies')
  })

  it('emits --cookies <path> when only cookiesFile is set', () => {
    const argv = build(opts(), dlo(), { ...NO_ACCESS, cookiesFile: 'C:/userdata/cookies.txt' })
    expect(hasSeq(argv, '--cookies', 'C:/userdata/cookies.txt')).toBe(true)
    expect(argv).not.toContain('--cookies-from-browser')
  })

  it('prefers cookiesFromBrowser over cookiesFile when both are set', () => {
    const argv = build(opts(), dlo(), {
      ...NO_ACCESS,
      cookiesFromBrowser: 'chrome',
      cookiesFile: 'C:/userdata/cookies.txt'
    })
    expect(hasSeq(argv, '--cookies-from-browser', 'chrome')).toBe(true)
    expect(argv).not.toContain('--cookies')
  })
})

// --- Restrict filenames / download archive -----------------------------------

describe('restrictFilenames / downloadArchivePath', () => {
  it('emits --restrict-filenames when set', () => {
    expect(build(opts(), dlo(), { ...NO_ACCESS, restrictFilenames: true })).toContain(
      '--restrict-filenames'
    )
  })

  it('omits --restrict-filenames by default', () => {
    expect(build(opts(), dlo(), NO_ACCESS)).not.toContain('--restrict-filenames')
  })

  it('emits --download-archive <path> when a path is given', () => {
    const argv = build(opts(), dlo(), { ...NO_ACCESS, downloadArchivePath: 'C:/userdata/archive.txt' })
    expect(hasSeq(argv, '--download-archive', 'C:/userdata/archive.txt')).toBe(true)
  })

  it('omits --download-archive when no path is given', () => {
    expect(build(opts(), dlo(), NO_ACCESS)).not.toContain('--download-archive')
  })
})

// --- Audio extraction format ------------------------------------------------

describe('audio: -x --audio-format <fmt>', () => {
  it.each(['mp3', 'opus', 'flac'] as const)('emits -x --audio-format %s', (fmt) => {
    const argv = build(audio(), dlo({ audioFormat: fmt }))
    expect(hasSeq(argv, '-x', '--audio-format', fmt)).toBe(true)
  })

  it('maps the quality label to an --audio-quality value', () => {
    expect(hasSeq(build(audio({ quality: 'Best (MP3)' }), dlo()), '--audio-quality', '0')).toBe(true)
    expect(hasSeq(build(audio({ quality: '320 kbps' }), dlo()), '--audio-quality', '320K')).toBe(
      true
    )
    expect(hasSeq(build(audio({ quality: '128 kbps' }), dlo()), '--audio-quality', '128K')).toBe(
      true
    )
  })
})

// --- Subtitles (video only) -------------------------------------------------

describe('embedSubtitles', () => {
  it('emits write/embed/sub-langs/convert without auto-subs by default', () => {
    const argv = build(opts(), dlo({ embedSubtitles: true }))
    expect(
      hasSeq(argv, '--write-subs', '--embed-subs', '--sub-langs', 'en', '--convert-subs', 'srt')
    ).toBe(true)
    expect(argv).not.toContain('--write-auto-subs')
  })

  it('inserts --write-auto-subs before --convert-subs when autoSubtitles is on', () => {
    const argv = build(opts(), dlo({ embedSubtitles: true, autoSubtitles: true }))
    expect(
      hasSeq(
        argv,
        '--write-subs',
        '--embed-subs',
        '--sub-langs',
        'en',
        '--write-auto-subs',
        '--convert-subs',
        'srt'
      )
    ).toBe(true)
  })

  it('honours a custom subtitleLanguages selector', () => {
    const argv = build(opts(), dlo({ embedSubtitles: true, subtitleLanguages: 'en.*,es' }))
    expect(hasSeq(argv, '--sub-langs', 'en.*,es')).toBe(true)
  })

  it('never writes subtitles for an audio download', () => {
    const argv = build(audio(), dlo({ embedSubtitles: true, autoSubtitles: true }))
    expect(argv).not.toContain('--write-subs')
    expect(argv).not.toContain('--embed-subs')
  })
})

// --- SponsorBlock -----------------------------------------------------------

describe('sponsorBlock', () => {
  it('remove → --sponsorblock-remove <cats> --force-keyframes-at-cuts', () => {
    const argv = build(opts(), dlo({ sponsorBlock: true, sponsorBlockMode: 'remove' }))
    expect(hasSeq(argv, '--sponsorblock-remove', 'sponsor', '--force-keyframes-at-cuts')).toBe(true)
    expect(argv).not.toContain('--sponsorblock-mark')
  })

  it('mark → --sponsorblock-mark <cats>, no keyframe forcing', () => {
    const argv = build(opts(), dlo({ sponsorBlock: true, sponsorBlockMode: 'mark' }))
    expect(hasSeq(argv, '--sponsorblock-mark', 'sponsor')).toBe(true)
    expect(argv).not.toContain('--sponsorblock-remove')
    expect(argv).not.toContain('--force-keyframes-at-cuts')
  })

  it('joins multiple categories with commas', () => {
    const argv = build(
      opts(),
      dlo({ sponsorBlock: true, sponsorBlockCategories: ['sponsor', 'intro', 'outro'] })
    )
    expect(hasSeq(argv, '--sponsorblock-remove', 'sponsor,intro,outro')).toBe(true)
  })

  it('emits nothing when sponsorBlock is off or category list is empty', () => {
    expect(build(opts(), dlo({ sponsorBlock: false })).join(' ')).not.toContain('sponsorblock')
    expect(
      build(opts(), dlo({ sponsorBlock: true, sponsorBlockCategories: [] })).join(' ')
    ).not.toContain('sponsorblock')
  })
})

// --- Preferred video codec (sort tiebreaker) --------------------------------

describe('preferredVideoCodec → -S res,fps,vcodec:<token>', () => {
  it('maps av1 to the av01 codec token', () => {
    expect(hasSeq(build(opts(), dlo({ preferredVideoCodec: 'av1' })), '-S', 'res,fps,vcodec:av01')).toBe(
      true
    )
  })

  it('passes h264 / vp9 through verbatim', () => {
    expect(hasSeq(build(opts(), dlo({ preferredVideoCodec: 'h264' })), '-S', 'res,fps,vcodec:h264')).toBe(
      true
    )
    expect(hasSeq(build(opts(), dlo({ preferredVideoCodec: 'vp9' })), '-S', 'res,fps,vcodec:vp9')).toBe(
      true
    )
  })

  it('omits -S entirely when codec preference is "any"', () => {
    expect(build(opts(), dlo({ preferredVideoCodec: 'any' }))).not.toContain('-S')
  })
})

// --- Cropped square cover art (the highest-risk ffmpeg quoting) --------------

describe('cropThumbnail → --ppa crop', () => {
  it('emits --embed-thumbnail then the square-crop --ppa string', () => {
    const argv = build(audio(), dlo({ embedThumbnail: true, cropThumbnail: true }))
    expect(hasSeq(argv, '--embed-thumbnail', '--ppa', CROP_SQUARE_PPA)).toBe(true)
  })

  it('uses single-quoted, comma-protected crop expressions for ffmpeg', () => {
    // The commas live inside gt(...) and MUST stay quoted so ffmpeg does not read
    // them as filtergraph separators. The targeted-postprocessor key plus the
    // ffmpeg_o output-args selector frame the whole value.
    expect(CROP_SQUARE_PPA).toBe(
      "EmbedThumbnail+ffmpeg_o:-c:v mjpeg -vf crop=\"'if(gt(ih,iw),iw,ih)':'if(gt(iw,ih),ih,iw)'\""
    )
  })

  it('does not add --ppa when cropThumbnail is off', () => {
    const argv = build(audio(), dlo({ embedThumbnail: true, cropThumbnail: false }))
    expect(argv).not.toContain('--ppa')
    expect(argv).toContain('--embed-thumbnail')
  })

  it('does not add --ppa when the thumbnail itself is not embedded', () => {
    const argv = build(audio(), dlo({ embedThumbnail: false, cropThumbnail: true }))
    expect(argv).not.toContain('--ppa')
    expect(argv).not.toContain('--embed-thumbnail')
  })
})

// --- Custom commands (Phase C): extra args + display formatting ------------

describe('parseExtraArgs', () => {
  it('splits on whitespace', () => {
    expect(parseExtraArgs('--write-thumbnail --no-mtime')).toEqual([
      '--write-thumbnail',
      '--no-mtime'
    ])
  })

  it('keeps a double-quoted span with spaces as one token', () => {
    expect(parseExtraArgs('--proxy "http://example.com:8080"')).toEqual([
      '--proxy',
      'http://example.com:8080'
    ])
  })

  it('keeps a single-quoted span with spaces as one token', () => {
    expect(parseExtraArgs("--output-na 'My Title - %(id)s.%(ext)s'")).toEqual([
      '--output-na',
      'My Title - %(id)s.%(ext)s'
    ])
  })

  it('returns an empty array for blank input', () => {
    expect(parseExtraArgs('')).toEqual([])
    expect(parseExtraArgs('   ')).toEqual([])
  })

  it('collapses repeated whitespace between tokens', () => {
    expect(parseExtraArgs('--verbose    --no-progress')).toEqual(['--verbose', '--no-progress'])
  })
})

describe('formatCommandLine', () => {
  it('joins the exe and args with spaces when nothing needs quoting', () => {
    expect(formatCommandLine('yt-dlp.exe', ['-f', 'best', '--', 'https://x.test/v'])).toBe(
      'yt-dlp.exe -f best -- https://x.test/v'
    )
  })

  it('quotes an arg containing a space', () => {
    expect(formatCommandLine('yt-dlp.exe', ['--ppa', 'EmbedThumbnail+ffmpeg_o:-c:v mjpeg'])).toBe(
      'yt-dlp.exe --ppa "EmbedThumbnail+ffmpeg_o:-c:v mjpeg"'
    )
  })

  it('escapes embedded double quotes', () => {
    expect(formatCommandLine('yt-dlp.exe', ['say "hi"'])).toBe('yt-dlp.exe "say \\"hi\\""')
  })

  it('renders an empty-string arg as ""', () => {
    expect(formatCommandLine('yt-dlp.exe', [''])).toBe('yt-dlp.exe ""')
  })
})

describe('buildArgs extraArgs', () => {
  it('appends extraArgs after every other option, still before -- url', () => {
    const argv = build(opts(), dlo(), NO_ACCESS, ['--write-thumbnail', '--no-mtime'])
    expect(hasSeq(argv, '--write-thumbnail', '--no-mtime', '--', URL)).toBe(true)
  })

  it('omits nothing extra when extraArgs is empty', () => {
    const withEmpty = build(opts(), dlo(), NO_ACCESS, [])
    const withoutParam = build(opts(), dlo())
    expect(withEmpty).toEqual(withoutParam)
  })
})