/**
 * Integration Tests for All API Endpoints
 *
 * Tests success and error cases for all routes:
 * - /api/notes (GET, POST)
 * - /api/notes/[id] (GET, PUT, DELETE)
 * - /api/notes/quick (POST)
 * - /api/tags (GET)
 * - /api/search (GET)
 * - /api/export-import (POST)
 */

import { NextRequest } from 'next/server'

// Complete mock Prisma client
const mockPrisma = {
  note: {
    findMany: jest.fn().mockResolvedValue([]),
    findUnique: jest.fn(),
    findFirst: jest.fn(),
    create: jest.fn(),
    update: jest.fn(),
    delete: jest.fn(),
    deleteMany: jest.fn(),
  },
  tag: {
    findMany: jest.fn().mockResolvedValue([]),
    findUnique: jest.fn(),
    upsert: jest.fn(),
    create: jest.fn(),
  },
  noteTag: {
    create: jest.fn(),
    deleteMany: jest.fn(),
  },
  backlink: {
    deleteMany: jest.fn(),
    create: jest.fn(),
    createMany: jest.fn(),
  },
  $transaction: jest.fn((callback) => callback(mockPrisma)),
}

// Mock prisma before imports
jest.mock('@/lib/prisma', () => ({
  prisma: mockPrisma,
}))

// Mock string-similarity used in search
jest.mock('string-similarity', () => ({
  compareTwoStrings: jest.fn().mockReturnValue(0.5),
}))

describe('API Integration Tests', () => {
  beforeEach(() => {
    jest.clearAllMocks()
    // Reset transaction mock to properly chain
    mockPrisma.$transaction.mockImplementation(async (callback) => {
      return callback(mockPrisma)
    })
  })

  // Helper to parse wrapped response
  function getData(response: { json: () => Promise<{ data?: unknown; error?: unknown; success: boolean }> }) {
    return response.json().then((r) => r.data ?? r)
  }

  function expectSuccess(response: { status: number; json: () => Promise<{ success: boolean }> }) {
    expect(response.status).toBeLessThan(400)
    return response.json().then((r) => expect(r.success).toBe(true))
  }

  // ============================================
  // GET /api/notes - List all notes
  // ============================================
  describe('GET /api/notes', () => {
    it('returns empty array when no notes exist', async () => {
      mockPrisma.note.findMany.mockResolvedValue([])

      const { GET } = await import('@/app/api/notes/route')
      const response = await GET(new NextRequest('http://localhost/api/notes'))
      const data = await getData(response)

      expect(response.status).toBe(200)
      expect(data).toEqual([])
    })

    it('returns all notes with tags', async () => {
      const mockNotes = [
        {
          id: '1',
          title: 'Note 1',
          content: 'Content 1',
          type: 'note',
          isFavorite: false,
          isPinned: false,
          createdAt: new Date('2024-01-01'),
          updatedAt: new Date('2024-01-01'),
          tags: [{ tag: { id: 't1', name: 'javascript' } }],
        },
      ]
      mockPrisma.note.findMany.mockResolvedValue(mockNotes)

      const { GET } = await import('@/app/api/notes/route')
      const response = await GET(new NextRequest('http://localhost/api/notes'))
      const data = await getData(response)

      expect(response.status).toBe(200)
      expect(Array.isArray(data)).toBe(true)
    })

    it('filters notes with search query', async () => {
      mockPrisma.note.findMany.mockResolvedValue([])

      const { GET } = await import('@/app/api/notes/route')
      const response = await GET(new NextRequest('http://localhost/api/notes?q=test'))

      expect(response.status).toBe(200)
    })
  })

  // ============================================
  // POST /api/notes - Create note
  // ============================================
  describe('POST /api/notes', () => {
    it('creates a note without tags', async () => {
      const newNote = {
        id: '1',
        title: 'New Note',
        content: 'Note content',
        type: 'note',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
        tags: [],
      }

      mockPrisma.note.create.mockResolvedValue(newNote)
      mockPrisma.backlink.deleteMany.mockResolvedValue([])

      const { POST } = await import('@/app/api/notes/route')
      const request = new NextRequest('http://localhost/api/notes', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({
          title: 'New Note',
          content: 'Note content',
        }),
      })

      const response = await POST(request)
      const data = await response.json()

      expect(response.status).toBe(201)
      expect(data.success).toBe(true)
      expect(data.data.title).toBe('New Note')
    })

    it('creates a note with tags', async () => {
      const newNote = {
        id: '1',
        title: 'Tagged Note',
        content: 'Content',
        type: 'note',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
        tags: [{ tag: { id: '1', name: 'javascript' } }],
      }

      mockPrisma.note.create.mockResolvedValue(newNote)
      mockPrisma.tag.upsert.mockResolvedValue({ id: '1', name: 'javascript' })
      mockPrisma.noteTag.create.mockResolvedValue({ noteId: '1', tagId: '1' })
      mockPrisma.backlink.deleteMany.mockResolvedValue([])

      const { POST } = await import('@/app/api/notes/route')
      const request = new NextRequest('http://localhost/api/notes', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({
          title: 'Tagged Note',
          content: 'Content',
          tags: ['JavaScript'],
        }),
      })

      const response = await POST(request)
      const data = await response.json()

      expect(response.status).toBe(201)
      expect(data.success).toBe(true)
    })

    it('returns 400 when title is missing', async () => {
      const { POST } = await import('@/app/api/notes/route')
      const request = new NextRequest('http://localhost/api/notes', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({
          title: '',
          content: 'Some content',
        }),
      })

      const response = await POST(request)

      expect(response.status).toBe(400)
    })

    it('returns 400 when content is missing', async () => {
      const { POST } = await import('@/app/api/notes/route')
      const request = new NextRequest('http://localhost/api/notes', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({
          title: 'Valid Title',
          content: '',
        }),
      })

      const response = await POST(request)

      expect(response.status).toBe(400)
    })
  })

  // ============================================
  // GET /api/notes/[id] - Get single note
  // ============================================
  describe('GET /api/notes/[id]', () => {
    it('returns note when found', async () => {
      const mockNote = {
        id: '1',
        title: 'Test Note',
        content: 'Content',
        type: 'note',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
        tags: [],
      }
      mockPrisma.note.findUnique.mockResolvedValue(mockNote)

      const { GET } = await import('@/app/api/notes/[id]/route')
      const request = new NextRequest('http://localhost/api/notes/1')
      const response = await GET(request, { params: Promise.resolve({ id: '1' }) })
      const data = await response.json()

      expect(response.status).toBe(200)
      expect(data.success).toBe(true)
      expect(data.data.id).toBe('1')
    })

    it('returns 404 when note not found', async () => {
      mockPrisma.note.findUnique.mockResolvedValue(null)

      const { GET } = await import('@/app/api/notes/[id]/route')
      const request = new NextRequest('http://localhost/api/notes/nonexistent')
      const response = await GET(request, { params: Promise.resolve({ id: 'nonexistent' }) })

      expect(response.status).toBe(404)
    })
  })

  // ============================================
  // PUT /api/notes/[id] - Update note
  // ============================================
  describe('PUT /api/notes/[id]', () => {
    it('updates note title', async () => {
      const existingNote = {
        id: '1',
        title: 'Old Title',
        content: 'Content',
        type: 'note',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
        tags: [],
      }
      const updatedNote = {
        ...existingNote,
        title: 'New Title',
      }

      mockPrisma.note.findUnique.mockResolvedValue(existingNote)
      mockPrisma.note.update.mockResolvedValue(updatedNote)
      mockPrisma.noteTag.deleteMany.mockResolvedValue([])
      mockPrisma.backlink.deleteMany.mockResolvedValue([])

      const { PUT } = await import('@/app/api/notes/[id]/route')
      const request = new NextRequest('http://localhost/api/notes/1', {
        method: 'PUT',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({ id: '1', title: 'New Title' }),
      })

      const response = await PUT(request, { params: Promise.resolve({ id: '1' }) })

      expect(response.status).toBe(200)
    })

    it('returns 404 when note to update not found', async () => {
      mockPrisma.note.findUnique.mockResolvedValue(null)

      const { PUT } = await import('@/app/api/notes/[id]/route')
      const request = new NextRequest('http://localhost/api/notes/nonexistent', {
        method: 'PUT',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({ id: 'nonexistent', title: 'New Title' }),
      })

      const response = await PUT(request, { params: Promise.resolve({ id: 'nonexistent' }) })

      expect(response.status).toBe(404)
    })

    it('returns 400 for invalid update data', async () => {
      const existingNote = {
        id: '1',
        title: 'Test',
        content: 'Content',
        type: 'note',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
        tags: [],
      }
      mockPrisma.note.findUnique.mockResolvedValue(existingNote)

      const { PUT } = await import('@/app/api/notes/[id]/route')
      const request = new NextRequest('http://localhost/api/notes/1', {
        method: 'PUT',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({ id: '1', title: '', content: '' }),
      })

      const response = await PUT(request, { params: Promise.resolve({ id: '1' }) })

      expect(response.status).toBe(400)
    })
  })

  // ============================================
  // DELETE /api/notes/[id] - Delete note
  // ============================================
  describe('DELETE /api/notes/[id]', () => {
    it('deletes note successfully', async () => {
      const existingNote = {
        id: '1',
        title: 'Test',
        content: 'Content',
        type: 'note',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
        tags: [],
      }
      mockPrisma.note.findUnique.mockResolvedValue(existingNote)
      mockPrisma.backlink.deleteMany.mockResolvedValue([])
      mockPrisma.note.delete.mockResolvedValue({ id: '1' })

      const { DELETE } = await import('@/app/api/notes/[id]/route')
      const request = new NextRequest('http://localhost/api/notes/1', {
        method: 'DELETE',
      })

      const response = await DELETE(request, { params: Promise.resolve({ id: '1' }) })

      expect(response.status).toBe(200)
    })

    it('returns 404 when deleting non-existent note', async () => {
      mockPrisma.note.findUnique.mockResolvedValue(null)

      const { DELETE } = await import('@/app/api/notes/[id]/route')
      const request = new NextRequest('http://localhost/api/notes/nonexistent', {
        method: 'DELETE',
      })

      const response = await DELETE(request, { params: Promise.resolve({ id: 'nonexistent' }) })

      expect(response.status).toBe(404)
    })
  })

  // ============================================
  // POST /api/notes/quick - Quick add note
  // ============================================
  describe('POST /api/notes/quick', () => {
    it('creates note from plain text', async () => {
      const createdNote = {
        id: '1',
        title: 'Quick Note',
        content: 'Quick Note',
        type: 'note',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
        tags: [],
      }
      mockPrisma.note.create.mockResolvedValue(createdNote)

      const { POST } = await import('@/app/api/notes/quick/route')
      const request = new NextRequest('http://localhost/api/notes/quick', {
        method: 'POST',
        headers: { 'content-type': 'text/plain' },
        body: 'Quick Note',
      })

      const response = await POST(request)
      const json = await response.json()
      const data = json.data ?? json

      expect(response.status).toBe(201)
      expect(data).toHaveProperty('title', 'Quick Note')
    })

    it('creates note with type prefix', async () => {
      const createdNote = {
        id: '1',
        title: 'Deploy script',
        content: 'deploy script content',
        type: 'command',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
        tags: [],
      }
      mockPrisma.note.create.mockResolvedValue(createdNote)

      const { POST } = await import('@/app/api/notes/quick/route')
      const request = new NextRequest('http://localhost/api/notes/quick', {
        method: 'POST',
        headers: { 'content-type': 'text/plain' },
        body: 'cmd: Deploy script\ndeploy script content',
      })

      const response = await POST(request)
      const json = await response.json()
      const data = json.data ?? json

      expect(response.status).toBe(201)
      expect(data).toHaveProperty('type', 'command')
    })

    it('returns 400 when text is empty', async () => {
      const { POST } = await import('@/app/api/notes/quick/route')
      const request = new NextRequest('http://localhost/api/notes/quick', {
        method: 'POST',
        headers: { 'content-type': 'text/plain' },
        body: '',
      })

      const response = await POST(request)

      expect(response.status).toBe(400)
    })

    it('returns 400 for JSON with missing text', async () => {
      const { POST } = await import('@/app/api/notes/quick/route')
      const request = new NextRequest('http://localhost/api/notes/quick', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({}),
      })

      const response = await POST(request)

      expect(response.status).toBe(400)
    })
  })

  // ============================================
  // GET /api/tags - List tags / suggestions
  // ============================================
  describe('GET /api/tags', () => {
    it('returns all tags when no query', async () => {
      const mockTags = [
        { id: '1', name: 'javascript' },
        { id: '2', name: 'python' },
        { id: '3', name: 'typescript' },
      ]
      mockPrisma.tag.findMany.mockResolvedValue(mockTags)

      const { GET } = await import('@/app/api/tags/route')
      const request = new NextRequest('http://localhost/api/tags')
      const response = await GET(request)
      const data = await response.json()

      expect(response.status).toBe(200)
      expect(data.success).toBe(true)
      expect(data.data).toEqual(mockTags)
    })

    it('returns tag suggestions when q param provided', async () => {
      const mockTags = [
        { id: '1', name: 'javascript' },
        { id: '2', name: 'java' },
      ]
      mockPrisma.tag.findMany.mockResolvedValue(mockTags)

      const { GET } = await import('@/app/api/tags/route')
      const request = new NextRequest('http://localhost/api/tags?q=java')
      const response = await GET(request)
      const data = await response.json()

      expect(response.status).toBe(200)
      expect(data.success).toBe(true)
      expect(Array.isArray(data.data)).toBe(true)
    })

    it('returns empty array when no tags exist', async () => {
      mockPrisma.tag.findMany.mockResolvedValue([])

      const { GET } = await import('@/app/api/tags/route')
      const request = new NextRequest('http://localhost/api/tags')
      const response = await GET(request)
      const data = await response.json()

      expect(response.status).toBe(200)
      expect(data.success).toBe(true)
      expect(data.data).toEqual([])
    })
  })

  // ============================================
  // GET /api/tags/suggest - Suggest tags based on content
  // ============================================
  describe('GET /api/tags/suggest', () => {
    it('suggests tags based on title keywords', async () => {
      const { GET } = await import('@/app/api/tags/suggest/route')
      const request = new NextRequest('http://localhost/api/tags/suggest?title=Docker%20deployment&content=')
      const response = await GET(request)
      const data = await response.json()

      expect(response.status).toBe(200)
      expect(data.success).toBe(true)
      expect(Array.isArray(data.data)).toBe(true)
    })

    it('suggests tags based on content keywords', async () => {
      const { GET } = await import('@/app/api/tags/suggest/route')
      const request = new NextRequest('http://localhost/api/tags/suggest?title=&content=Docker%20and%20Kubernetes%20deployment')
      const response = await GET(request)
      const data = await response.json()

      expect(response.status).toBe(200)
      expect(data.success).toBe(true)
      expect(Array.isArray(data.data))
    })

    it('combines title and content for suggestions', async () => {
      const { GET } = await import('@/app/api/tags/suggest/route')
      const request = new NextRequest('http://localhost/api/tags/suggest?title=Python%20script&content=SQL%20database%20query')
      const response = await GET(request)
      const data = await response.json()

      expect(response.status).toBe(200)
      expect(data.success).toBe(true)
    })

    it('returns empty array for generic content', async () => {
      const { GET } = await import('@/app/api/tags/suggest/route')
      const request = new NextRequest('http://localhost/api/tags/suggest?title=Note&content=content')
      const response = await GET(request)
      const data = await response.json()

      expect(response.status).toBe(200)
      expect(data.success).toBe(true)
      expect(Array.isArray(data.data)).toBe(true)
    })

    it('handles empty parameters gracefully', async () => {
      const { GET } = await import('@/app/api/tags/suggest/route')
      const request = new NextRequest('http://localhost/api/tags/suggest')
      const response = await GET(request)
      const data = await response.json()

      expect(response.status).toBe(200)
      expect(data.success).toBe(true)
    })
  })

  // ============================================
  // GET /api/search - Search notes
  // ============================================
  describe('GET /api/search', () => {
    it('returns search results with query', async () => {
      const mockNotes = [
        {
          id: '1',
          title: 'JavaScript Guide',
          content: 'Learning JavaScript basics',
          type: 'note',
          isFavorite: false,
          isPinned: false,
          createdAt: new Date(),
          updatedAt: new Date(),
          tags: [],
        },
      ]
      mockPrisma.note.findMany.mockResolvedValue(mockNotes)

      const { GET } = await import('@/app/api/search/route')
      const request = new NextRequest('http://localhost/api/search?q=javascript')
      const response = await GET(request)

      expect(response.status).toBe(200)
    })

    it('filters by type', async () => {
      mockPrisma.note.findMany.mockResolvedValue([])

      const { GET } = await import('@/app/api/search/route')
      const request = new NextRequest('http://localhost/api/search?type=command')
      const response = await GET(request)

      expect(response.status).toBe(200)
    })

    it('filters by tag', async () => {
      mockPrisma.note.findMany.mockResolvedValue([])

      const { GET } = await import('@/app/api/search/route')
      const request = new NextRequest('http://localhost/api/search?tag=python')
      const response = await GET(request)

      expect(response.status).toBe(200)
    })
  })

  // ============================================
  // POST /api/export-import - Import notes
  // ============================================
  describe('POST /api/export-import', () => {
    it('imports valid notes array', async () => {
      mockPrisma.note.findUnique.mockResolvedValue(null)
      mockPrisma.note.findFirst.mockResolvedValue(null)
      mockPrisma.note.create.mockResolvedValue({
        id: '1',
        title: 'Imported Note',
        content: 'Content',
        type: 'note',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
      })
      mockPrisma.tag.upsert.mockResolvedValue({ id: '1', name: 'imported' })
      mockPrisma.noteTag.create.mockResolvedValue({ noteId: '1', tagId: '1' })
      mockPrisma.noteTag.deleteMany.mockResolvedValue([])

      const { POST } = await import('@/app/api/export-import/route')
      const request = new NextRequest('http://localhost/api/export-import', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify([
          {
            title: 'Imported Note',
            content: 'Content',
            type: 'note',
            tags: ['imported'],
          },
        ]),
      })

      const response = await POST(request)

      expect(response.status).toBe(201)
    })

    it('returns 400 for non-array input', async () => {
      const { POST } = await import('@/app/api/export-import/route')
      const request = new NextRequest('http://localhost/api/export-import', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify({ title: 'Single note' }),
      })

      const response = await POST(request)

      expect(response.status).toBe(400)
    })

    it('returns 400 for invalid note in array', async () => {
      const { POST } = await import('@/app/api/export-import/route')
      const request = new NextRequest('http://localhost/api/export-import', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify([
          {
            title: '',
            content: 'Invalid note',
          },
        ]),
      })

      const response = await POST(request)

      expect(response.status).toBe(400)
    })

    it('updates existing note when id matches', async () => {
      const existingNote = {
        id: '1',
        title: 'Old Title',
        content: 'Old content',
        type: 'note',
        isFavorite: false,
        isPinned: false,
        createdAt: new Date(),
        updatedAt: new Date(),
      }
      mockPrisma.note.findUnique.mockResolvedValue(existingNote)
      mockPrisma.note.update.mockResolvedValue({
        ...existingNote,
        title: 'Updated Title',
      })
      mockPrisma.noteTag.deleteMany.mockResolvedValue([])

      const { POST } = await import('@/app/api/export-import/route')
      const request = new NextRequest('http://localhost/api/export-import', {
        method: 'POST',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify([
          {
            id: '1',
            title: 'Updated Title',
            content: 'Updated content',
            type: 'note',
          },
        ]),
      })

      const response = await POST(request)

      expect(response.status).toBe(201)
    })
  })
})