import { initDatabase, cacheChapter, getCachedChapter, clearExpiredCache } from '@/lib/cache-manager'
import { BibleChapter } from '@/types'

// Mock IndexedDB for testing
const mockIndexedDB = (() => {
  let stores: Record<string, Record<string, any>> = {}
  let dbVersion = 0

  return {
    open: (name: string, version: number) => {
      const request: any = {
        result: null,
        error: null,
        onsuccess: null,
        onerror: null,
        onupgradeneeded: null,
      }

      setTimeout(() => {
        if (version > dbVersion) {
          dbVersion = version
          const upgradeEvent: any = {
            target: {
              result: {
                objectStoreNames: {
                  contains: (name: string) => !!stores[name]
                },
                createObjectStore: (storeName: string, options: any) => {
                  stores[storeName] = {}
                  return {
                    createIndex: () => {}
                  }
                }
              }
            }
          }
          request.onupgradeneeded?.(upgradeEvent)
        }

        request.result = {
          transaction: (storeNames: string[], mode: string) => {
            const storeName = storeNames[0]
            return {
              objectStore: (name: string) => {
                if (!stores[name]) stores[name] = {}
                return {
                  get: (key: string) => {
                    const req: any = {
                      result: stores[name][key],
                      onsuccess: null,
                      onerror: null
                    }
                    setTimeout(() => req.onsuccess?.(), 0)
                    return req
                  },
                  put: (value: any) => {
                    const key = value.chapterId
                    stores[name][key] = value
                    const req: any = {
                      onsuccess: null,
                      onerror: null
                    }
                    setTimeout(() => req.onsuccess?.(), 0)
                    return req
                  },
                  count: () => {
                    const req: any = {
                      result: Object.keys(stores[name]).length,
                      onsuccess: null
                    }
                    setTimeout(() => req.onsuccess?.(), 0)
                    return req
                  },
                  index: (indexName: string) => {
                    return {
                      openCursor: (range?: any) => {
                        const req: any = {
                          result: null,
                          onsuccess: null
                        }
                        setTimeout(() => req.onsuccess?.({ target: req }), 0)
                        return req
                      }
                    }
                  }
                }
              }
            }
          }
        }
        request.onsuccess?.()
      }, 0)

      return request
    }
  }
})()

// Setup mock for tests
beforeAll(() => {
  ;(global as any).indexedDB = mockIndexedDB
})

describe('cache-manager', () => {
  const mockChapter: BibleChapter = {
    id: '1-1',
    bookId: 1,
    bookName: 'Genesis',
    chapter: 1,
    verses: [
      {
        id: 'v1',
        chapterId: '1-1',
        verseNum: 1,
        text: 'In the beginning God created the heaven and the earth.',
        version: 'KJV',
        chapter: {
          chapterNum: 1,
          book: {
            name: 'Genesis'
          }
        }
      }
    ]
  }

  describe('initDatabase', () => {
    it('initializes the database successfully', async () => {
      const db = await initDatabase()
      expect(db).toBeDefined()
      expect(db.transaction).toBeDefined()
    })
  })

  describe('cacheChapter', () => {
    it('caches a chapter successfully', async () => {
      await cacheChapter(mockChapter)
      // If no error thrown, test passes
      expect(true).toBe(true)
    })

    it('creates cache entry with expiration', async () => {
      await cacheChapter(mockChapter)
      const cached = await getCachedChapter('1-1')
      expect(cached).toBeDefined()
      expect(cached?.id).toBe('1-1')
    })
  })

  describe('getCachedChapter', () => {
    it('returns cached chapter if not expired', async () => {
      await cacheChapter(mockChapter)
      const result = await getCachedChapter('1-1')
      expect(result).not.toBeNull()
      expect(result?.bookName).toBe('Genesis')
      expect(result?.chapter).toBe(1)
    })

    it('returns null for non-existent chapter', async () => {
      const result = await getCachedChapter('999-999')
      expect(result).toBeNull()
    })
  })

  describe('clearExpiredCache', () => {
    it('runs without error', async () => {
      await clearExpiredCache()
      // If no error thrown, test passes
      expect(true).toBe(true)
    })
  })
})