import { describe, it, expect, vi, beforeEach } from 'vitest'
import path from 'path'
import {
  buildQrUrl,
  generateZoneQrs,
  ZONES,
  DEFAULT_BASE_URL,
  type Zone,
  type GenerateDeps,
} from '@/scripts/generate-qr'

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

function makeDeps() {
  return {
    toFile: vi.fn<GenerateDeps['toFile']>().mockResolvedValue(undefined),
    mkdirSync: vi.fn<GenerateDeps['mkdirSync']>(),
    log: vi.fn<GenerateDeps['log']>(),
  }
}

const OUT_DIR = '/fake/public/qr'

// ---------------------------------------------------------------------------
// buildQrUrl — pure function
// ---------------------------------------------------------------------------

describe('buildQrUrl', () => {
  it('combines baseUrl and token into a /report?zone= URL', () => {
    expect(buildQrUrl('https://example.com', 'scw1-dock-a-qr-2026')).toBe(
      'https://example.com/report?zone=scw1-dock-a-qr-2026',
    )
  })

  it('works with localhost base URL', () => {
    expect(buildQrUrl('http://localhost:3000', 'my-token')).toBe(
      'http://localhost:3000/report?zone=my-token',
    )
  })

  it('does not add a double slash between baseUrl and /report', () => {
    const url = buildQrUrl('https://ims.example.com', 'token-xyz')
    // Strip the protocol so the only // would be an accidental duplicate slash
    expect(url.replace('https://', '')).not.toContain('//')
  })

  it('handles token with hyphens and digits', () => {
    const token = 'scw1-cold-storage-qr-2026'
    expect(buildQrUrl('https://example.com', token)).toContain(token)
  })
})

// ---------------------------------------------------------------------------
// ZONES constant — shape invariants
// ---------------------------------------------------------------------------

describe('ZONES', () => {
  it('contains exactly 3 zones', () => {
    expect(ZONES).toHaveLength(3)
  })

  it('every zone has a non-empty token and name', () => {
    for (const zone of ZONES) {
      expect(zone.token).toBeTruthy()
      expect(zone.name).toBeTruthy()
    }
  })

  it('tokens match the seeded qr_code_token values from the migration', () => {
    const tokens = ZONES.map((z) => z.token)
    expect(tokens).toContain('scw1-dock-a-qr-2026')
    expect(tokens).toContain('scw1-cold-storage-qr-2026')
    expect(tokens).toContain('scw1-loading-bay-qr-2026')
  })

  it('all tokens are unique', () => {
    const tokens = ZONES.map((z) => z.token)
    expect(new Set(tokens).size).toBe(tokens.length)
  })
})

// ---------------------------------------------------------------------------
// DEFAULT_BASE_URL
// ---------------------------------------------------------------------------

describe('DEFAULT_BASE_URL', () => {
  it('falls back to localhost:3000', () => {
    expect(DEFAULT_BASE_URL).toBe('http://localhost:3000')
  })
})

// ---------------------------------------------------------------------------
// generateZoneQrs — I/O behaviour
// ---------------------------------------------------------------------------

describe('generateZoneQrs', () => {
  let deps: ReturnType<typeof makeDeps>

  beforeEach(() => {
    deps = makeDeps()
  })

  it('creates the output directory with recursive: true', async () => {
    await generateZoneQrs(ZONES, OUT_DIR, DEFAULT_BASE_URL, deps)
    expect(deps.mkdirSync).toHaveBeenCalledWith(OUT_DIR, { recursive: true })
  })

  it('calls toFile once per zone', async () => {
    await generateZoneQrs(ZONES, OUT_DIR, DEFAULT_BASE_URL, deps)
    expect(deps.toFile).toHaveBeenCalledTimes(ZONES.length)
  })

  it('passes the correct URL to toFile for each zone', async () => {
    await generateZoneQrs(ZONES, OUT_DIR, DEFAULT_BASE_URL, deps)
    for (const zone of ZONES) {
      const expectedUrl = buildQrUrl(DEFAULT_BASE_URL, zone.token)
      expect(deps.toFile).toHaveBeenCalledWith(
        expect.any(String),
        expectedUrl,
        expect.any(Object),
      )
    }
  })

  it('writes each PNG to <outDir>/<token>.png', async () => {
    await generateZoneQrs(ZONES, OUT_DIR, DEFAULT_BASE_URL, deps)
    for (const zone of ZONES) {
      const expectedPath = path.join(OUT_DIR, `${zone.token}.png`)
      expect(deps.toFile).toHaveBeenCalledWith(
        expectedPath,
        expect.any(String),
        expect.any(Object),
      )
    }
  })

  it('passes the expected QRCode options (width, margin, color)', async () => {
    await generateZoneQrs(ZONES, OUT_DIR, DEFAULT_BASE_URL, deps)
    const [, , opts] = deps.toFile.mock.calls[0]
    expect(opts).toMatchObject({
      width: 400,
      margin: 2,
      color: { dark: '#000000', light: '#FFFFFF' },
    })
  })

  it('uses the supplied baseUrl instead of the default', async () => {
    const customBase = 'https://ims.setiacorp.com'
    await generateZoneQrs(ZONES, OUT_DIR, customBase, deps)
    const firstUrl: string = deps.toFile.mock.calls[0][1]
    expect(firstUrl.startsWith(customBase)).toBe(true)
  })

  it('logs three lines per zone (check-mark, url, path)', async () => {
    await generateZoneQrs(ZONES, OUT_DIR, DEFAULT_BASE_URL, deps)
    expect(deps.log).toHaveBeenCalledTimes(ZONES.length * 3)
  })

  it('handles a single-zone list correctly', async () => {
    const single: Zone[] = [{ token: 'test-zone-token', name: 'Test Zone' }]
    await generateZoneQrs(single, OUT_DIR, DEFAULT_BASE_URL, deps)
    expect(deps.toFile).toHaveBeenCalledTimes(1)
    expect(deps.toFile).toHaveBeenCalledWith(
      path.join(OUT_DIR, 'test-zone-token.png'),
      `${DEFAULT_BASE_URL}/report?zone=test-zone-token`,
      expect.any(Object),
    )
  })

  it('handles an empty zone list without errors', async () => {
    await generateZoneQrs([], OUT_DIR, DEFAULT_BASE_URL, deps)
    expect(deps.toFile).not.toHaveBeenCalled()
    expect(deps.log).not.toHaveBeenCalled()
    // mkdir is still called to ensure the directory exists
    expect(deps.mkdirSync).toHaveBeenCalledOnce()
  })

  it('propagates errors thrown by toFile', async () => {
    const boom = new Error('disk full')
    deps.toFile.mockRejectedValueOnce(boom)
    await expect(
      generateZoneQrs(ZONES, OUT_DIR, DEFAULT_BASE_URL, deps),
    ).rejects.toThrow('disk full')
  })

  it('propagates errors thrown by mkdirSync', async () => {
    deps.mkdirSync.mockImplementationOnce(() => {
      throw new Error('permission denied')
    })
    await expect(
      generateZoneQrs(ZONES, OUT_DIR, DEFAULT_BASE_URL, deps),
    ).rejects.toThrow('permission denied')
  })
})