import { test, expect, describe } from 'bun:test'
import { CHANGE_ID_PATTERN } from '@/services/commit-hook'

// Tests for commit-hook service patterns
// Note: Tests that require actual git operations are skipped in the full test suite
// due to mock pollution from other test files. Run these tests in isolation for full coverage:
// bun test tests/unit/services/commit-hook.test.ts

describe('Commit Hook Service', () => {
  describe('CHANGE_ID_PATTERN', () => {
    test('should match valid Change-Id', () => {
      const validIds = [
        'Change-Id: I1234567890123456789012345678901234567890',
        'Change-Id: Iabcdefabcdefabcdefabcdefabcdefabcdefabcd',
        'Change-Id: I0000000000000000000000000000000000000000',
        'Change-Id: Iffffffffffffffffffffffffffffffffffffffff',
      ]

      for (const id of validIds) {
        expect(CHANGE_ID_PATTERN.test(id)).toBe(true)
      }
    })

    test('should not match invalid Change-Id', () => {
      const invalidIds = [
        'Change-Id: 1234567890123456789012345678901234567890', // Missing I prefix
        'Change-Id: I123456789012345678901234567890123456789', // Too short (39 chars)
        'Change-Id: I12345678901234567890123456789012345678901', // Too long (41 chars)
        'Change-Id: IGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG', // Invalid hex chars
        'Change-Id: i1234567890123456789012345678901234567890', // Lowercase I
        'change-id: I1234567890123456789012345678901234567890', // Lowercase prefix
      ]

      for (const id of invalidIds) {
        expect(CHANGE_ID_PATTERN.test(id)).toBe(false)
      }
    })

    test('should match Change-Id in multiline commit message', () => {
      const commitMessage = `Fix authentication bug

This commit fixes the login issue where users
were being logged out unexpectedly.

Change-Id: I1234567890123456789012345678901234567890
Signed-off-by: Test User <test@example.com>`

      expect(CHANGE_ID_PATTERN.test(commitMessage)).toBe(true)
    })

    test('should not match Change-Id in wrong position', () => {
      // Change-Id should be at start of line
      const wrongPosition = '  Change-Id: I1234567890123456789012345678901234567890'
      expect(CHANGE_ID_PATTERN.test(wrongPosition)).toBe(false)
    })
  })

  describe('hook path patterns', () => {
    test('should construct correct hooks directory path', () => {
      const gitDir = '.git'
      const hooksDir = `${gitDir}/hooks`
      expect(hooksDir).toBe('.git/hooks')
    })

    test('should construct correct commit-msg hook path', () => {
      const gitDir = '.git'
      const hookPath = `${gitDir}/hooks/commit-msg`
      expect(hookPath).toBe('.git/hooks/commit-msg')
    })

    test('should handle absolute git dir path', () => {
      const gitDir = '/home/user/project/.git'
      const hookPath = `${gitDir}/hooks/commit-msg`
      expect(hookPath).toBe('/home/user/project/.git/hooks/commit-msg')
    })
  })

  describe('hook URL construction', () => {
    test('should construct correct hook URL', () => {
      const host = 'https://gerrit.example.com'
      const hookUrl = `${host}/tools/hooks/commit-msg`
      expect(hookUrl).toBe('https://gerrit.example.com/tools/hooks/commit-msg')
    })

    test('should handle host with trailing slash', () => {
      const host = 'https://gerrit.example.com/'
      const normalizedHost = host.replace(/\/$/, '')
      const hookUrl = `${normalizedHost}/tools/hooks/commit-msg`
      expect(hookUrl).toBe('https://gerrit.example.com/tools/hooks/commit-msg')
    })
  })

  describe('hook content validation', () => {
    test('should validate shell script header', () => {
      const validHook = '#!/bin/sh\necho "Adding Change-Id"'
      expect(validHook.startsWith('#!')).toBe(true)
    })

    test('should reject non-script content', () => {
      const invalidHook = 'This is not a script'
      expect(invalidHook.startsWith('#!')).toBe(false)
    })

    test('should validate bash script header', () => {
      const bashHook = '#!/bin/bash\necho "Adding Change-Id"'
      expect(bashHook.startsWith('#!')).toBe(true)
    })
  })

  describe('executable bit checking', () => {
    test('should identify executable mode', () => {
      const executableMode = 0o755
      const ownerExecuteBit = 0o100

      expect((executableMode & ownerExecuteBit) !== 0).toBe(true)
    })

    test('should identify non-executable mode', () => {
      const nonExecutableMode = 0o644
      const ownerExecuteBit = 0o100

      expect((nonExecutableMode & ownerExecuteBit) !== 0).toBe(false)
    })

    test('should handle read-only mode', () => {
      const readOnlyMode = 0o444
      const ownerExecuteBit = 0o100

      expect((readOnlyMode & ownerExecuteBit) !== 0).toBe(false)
    })
  })
})