import { highlightMatches, noteQuery, searchNotes, ScoredNote } from '@/lib/search'

// Mock prisma and usage before importing search module
jest.mock('@/lib/prisma', () => ({
  prisma: {
    note: {
      findMany: jest.fn(),
    },
  },
}))

jest.mock('@/lib/usage', () => ({
  getUsageStats: jest.fn(),
}))

import { prisma } from '@/lib/prisma'
import { getUsageStats } from '@/lib/usage'

describe('search.ts', () => {
  const mockNotes = [
    {
      id: 'note-1',
      title: 'Docker Commands',
      content: 'docker build and docker run',
      type: 'command',
      isFavorite: true,
      isPinned: false,
      createdAt: new Date('2024-01-01'),
      updatedAt: new Date('2024-01-15'),
      tags: [{ tag: { id: 'tag-1', name: 'docker' } }],
    },
    {
      id: 'note-2',
      title: 'React Hooks',
      content: 'useState and useEffect hooks',
      type: 'snippet',
      isFavorite: false,
      isPinned: true,
      createdAt: new Date('2024-01-02'),
      updatedAt: new Date('2024-01-10'),
      tags: [{ tag: { id: 'tag-2', name: 'react' } }],
    },
    {
      id: 'note-3',
      title: 'Git Commands',
      content: 'git commit and git push',
      type: 'command',
      isFavorite: false,
      isPinned: false,
      createdAt: new Date('2024-01-03'),
      updatedAt: new Date('2024-01-05'),
      tags: [{ tag: { id: 'tag-3', name: 'git' } }],
    },
  ]

  beforeEach(() => {
    jest.clearAllMocks()
    // Default: no usage
    ;(getUsageStats as jest.Mock).mockResolvedValue({ views: 0, clicks: 0, relatedClicks: 0 })
  })

  describe('highlightMatches', () => {
    it('returns first 150 characters when query is empty', () => {
      const text = 'This is a long text that should be truncated to 150 characters. ' +
        'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor.'
      const result = highlightMatches(text, '')
      expect(result.length).toBeLessThanOrEqual(150)
    })

    it('finds and highlights matching words', () => {
      const text = 'This is a test document about JavaScript programming.'
      const result = highlightMatches(text, 'JavaScript')
      expect(result).toContain('<mark>JavaScript</mark>')
    })

    it('handles multiple word queries', () => {
      const text = 'React is a JavaScript library for building user interfaces.'
      const result = highlightMatches(text, 'JavaScript React')
      expect(result).toContain('<mark>JavaScript</mark>')
      expect(result).toContain('<mark>React</mark>')
    })

    it('escapes regex special characters in query', () => {
      const text = 'What is $100 + $200?'
      const result = highlightMatches(text, '$100')
      expect(result).toContain('<mark>$100</mark>')
    })

    it('adds ellipsis when match is not at start', () => {
      const text = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. JavaScript is great.'
      const result = highlightMatches(text, 'JavaScript')
      expect(result).toContain('<mark>JavaScript</mark>')
    })

    it('returns plain text when no match found', () => {
      const text = 'This is a simple text without the word we are looking for.'
      const result = highlightMatches(text, 'xyz123')
      expect(result).not.toContain('<mark>')
    })

    it('filters out single character words and returns excerpt', () => {
      const text = 'A B C D E F G H I J K L M N O P Q R S T U V W X Y Z'
      const result = highlightMatches(text, 'A B C')
      // Single char words (A, B, C) are filtered, returns 150 chars
      expect(result.length).toBeLessThanOrEqual(150)
    })

    it('adds ellipsis when match is far from start', () => {
      // JavaScript is at position ~26, start = max(0, 26-75) = 0, so no ellipsis needed
      // We need a longer text where match is more than 75 chars from start
      const text = 'Lorem ipsum dolor sit amet. '.repeat(10) + 'JavaScript programming language.'
      const result = highlightMatches(text, 'JavaScript')
      expect(result).toContain('...')
    })
  })

  describe('noteQuery', () => {
    it('returns empty array when no notes exist', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue([])

      const result = await noteQuery('docker')

      expect(result).toEqual([])
    })

    it('returns notes with exact title match scored highest', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('docker')

      expect(result[0].id).toBe('note-1') // exact title match
      expect(result[0].matchType).toBe('exact')
    })

    it('returns notes with content match', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('hooks')

      expect(result.length).toBeGreaterThan(0)
      expect(result.some((n: ScoredNote) => n.id === 'note-2')).toBe(true)
    })

    it('returns fuzzy matches when no exact match', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('docer') // typo

      expect(result.length).toBeGreaterThan(0)
      expect(result[0].matchType).toBe('fuzzy')
    })

    it('excludes notes with no match (low similarity)', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('xyz123nonexistent')

      expect(result.length).toBe(0)
    })

    it('adds +2 for favorite notes', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('docker')

      // note-1 is favorite, should have higher score
      const dockerNote = result.find((n: ScoredNote) => n.id === 'note-1')
      expect(dockerNote?.isFavorite).toBe(true)
    })

    it('adds +1 for pinned notes', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('hooks')

      // note-2 is pinned
      const hooksNote = result.find((n: ScoredNote) => n.id === 'note-2')
      expect(hooksNote?.isPinned).toBe(true)
    })

    it('adds +1 for recently updated notes (within 7 days)', async () => {
      const recentNote = {
        ...mockNotes[0],
        updatedAt: new Date(Date.now() - 1000), // just now
      }
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue([recentNote])

      const result = await noteQuery('docker')

      expect(result[0].score).toBeGreaterThan(0)
    })

    it('filters by type when specified', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('', { type: 'command' })

      expect(result.every((n: ScoredNote) => n.type === 'command')).toBe(true)
    })

    it('filters by tag when specified', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('', { tag: 'docker' })

      expect(result.length).toBe(1)
      expect(result[0].id).toBe('note-1')
    })

    it('returns notes sorted by score descending', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('')

      for (let i = 0; i < result.length - 1; i++) {
        expect(result[i].score).toBeGreaterThanOrEqual(result[i + 1].score)
      }
    })

    it('returns highlight excerpt for matched notes', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await noteQuery('docker')

      expect(result[0].highlight).toBeDefined()
      expect(typeof result[0].highlight).toBe('string')
    })
  })

  describe('searchNotes', () => {
    it('should be an alias for noteQuery', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await searchNotes('docker')

      expect(result).toEqual(await noteQuery('docker'))
    })

    it('passes filters to noteQuery', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue(mockNotes)

      const result = await searchNotes('', { type: 'snippet' })

      expect(result.every((n: ScoredNote) => n.type === 'snippet')).toBe(true)
    })
  })

  describe('usage-based scoring boost', () => {
    it('calls getUsageStats for each note', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue([mockNotes[0]])
      ;(getUsageStats as jest.Mock).mockResolvedValue({ views: 0, clicks: 0, relatedClicks: 0 })

      await noteQuery('docker')

      expect(getUsageStats).toHaveBeenCalledWith('note-1', 7)
    })

    it('handles getUsageStats returning zero values', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue([mockNotes[0]])
      ;(getUsageStats as jest.Mock).mockResolvedValue({ views: 0, clicks: 0, relatedClicks: 0 })

      const result = await noteQuery('docker')

      // Should return results without error
      expect(result).toBeDefined()
      expect(result.length).toBeGreaterThan(0)
    })
  })

  describe('ScoredNote interface', () => {
    it('returns correct structure for scored notes', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue([mockNotes[0]])

      const result = await noteQuery('docker')

      expect(result[0]).toHaveProperty('id')
      expect(result[0]).toHaveProperty('title')
      expect(result[0]).toHaveProperty('content')
      expect(result[0]).toHaveProperty('type')
      expect(result[0]).toHaveProperty('isFavorite')
      expect(result[0]).toHaveProperty('isPinned')
      expect(result[0]).toHaveProperty('createdAt')
      expect(result[0]).toHaveProperty('updatedAt')
      expect(result[0]).toHaveProperty('tags')
      expect(result[0]).toHaveProperty('score')
      expect(result[0]).toHaveProperty('highlight')
      expect(result[0]).toHaveProperty('matchType')
      expect(['exact', 'fuzzy']).toContain(result[0].matchType)
    })

    it('converts Date objects to ISO strings', async () => {
      ;(prisma.note.findMany as jest.Mock).mockResolvedValue([mockNotes[0]])

      const result = await noteQuery('docker')

      expect(result[0].createdAt).toBe('2024-01-01T00:00:00.000Z')
      expect(result[0].updatedAt).toBe('2024-01-15T00:00:00.000Z')
    })
  })
})