import { defineStore } from 'pinia'

interface IndexedDBStoreConfig {
  name: string;
  keyPath: string;
  indexes?: Array<{
    name: string
    keyPath: string | string[]
    options?: IDBIndexParameters
  }>;
}

interface IndexedDBConfig {
  dbName: string;
  version?: number;
}

export const useIndexedDBStore = defineStore('indexedDB', {
  state: () => ({
    storeRegistry: new Map<string, IndexedDBStoreConfig>(),
    dbName: <string>'',
    db: <IDBDatabase | null>null,
    currentVersion: <number>0,
    isInitialized: <boolean>false
  }),
  actions: {
    registerStore(storeConfig: IndexedDBStoreConfig) {
      if (!this.storeRegistry.has(storeConfig.name)) {
        this.storeRegistry.set(storeConfig.name, storeConfig)
      }
    },
    deleteDB() {
      return new Promise<boolean>((resolve, reject) => {
        const request = indexedDB.deleteDatabase(this.dbName)
        request.onsuccess = () => {
          resolve(true)
          window.location.reload()
        }
        request.onerror = () => {
          reject(request.error)
        }
      })
    },
    openDB(config: IndexedDBConfig) {
      if (config) {
        this.dbName = config.dbName
        this.currentVersion = config.version || 1
      }
      return new Promise((resolve, reject) => {
        const request = indexedDB.open(this.dbName, this.currentVersion)
        request.onupgradeneeded = (event: IDBVersionChangeEvent) => {
          const db = (event.target as IDBOpenDBRequest).result
          // 从注册中心获取所有Store配置
          const stores = Array.from(this.storeRegistry.values())
          stores.forEach((storeConfig: any) => {
            if (!db.objectStoreNames.contains(storeConfig.name)) {
              const objectStore = db.createObjectStore(
                storeConfig.name,
                { keyPath: storeConfig.keyPath }
              )
              storeConfig.indexes?.forEach((index: any) => {
                objectStore.createIndex(
                  index.name,
                  index.keyPath,
                  index.options
                )
              })
            }
          })
        }

        request.onsuccess = (event: Event) => {
          this.db = (event.target as IDBOpenDBRequest).result
          this.isInitialized = true
          Array.from(this.db.objectStoreNames).forEach((storeName: any) => {
            this.registerStore({
              name: storeName,
              keyPath: 'id'
            })
          })
          resolve(this.db)
        }

        request.onerror = (event: Event) => {
          reject((event.target as IDBOpenDBRequest).error)
        }
      })
    },
    // 动态升级数据库版本
    async upgradeVersion() {
      this.currentVersion += 1
      localStorage.setItem('dbVersion', this.currentVersion.toString())
      this.db?.close()
      return this.openDB({ dbName: this.dbName, version: this.currentVersion })
    },
    useStore(storeName: string) {
      const verifyStore = async () => {
        if (!this.storeRegistry.has(storeName)) {
          throw new Error(`Store ${storeName} not registered`)
        }

        if (this.db && !this.db.objectStoreNames.contains(storeName)) {
          await this.upgradeVersion()
        }
      }

      const executeWithTransaction = async (mode: IDBTransactionMode, operation: any) => {
        await verifyStore()
        if (!this.db) await this.openDB({ dbName: this.dbName, version: this.currentVersion })

        return new Promise((resolve, reject) => {
          // this.db;
          const transaction = this.db!.transaction(storeName, mode)
          const objectStore = transaction.objectStore(storeName)

          // 事务成功完成时的回调
          // transaction.oncomplete = () => {
          //     resolve(); // 事务成功完成，返回结果
          // };

          // 事务失败时的回调
          transaction.onerror = (event) => {
            reject((event.target as IDBRequest).error)
          }

          // 执行操作
          operation(objectStore).then((result: any) => {
            // 操作成功，返回结果
            resolve(result)
          }).catch((error: any) => {
            // 操作失败，拒绝 Promise
            reject(error)
          })
        })
      }

      return {
        add: (data: any) => executeWithTransaction(
          'readwrite',
          (store: any) => new Promise((resolve, reject) => {
            const request = store.add(data)
            request.onsuccess = () => resolve(request.result as IDBValidKey)
            request.onerror = () => reject(request.error)
          })
        ),

        get: (key: IDBValidKey) => executeWithTransaction(
          'readonly',
          (store: any) => new Promise((resolve, reject) => {
            const request = store.get(key)
            request.onsuccess = () => resolve(request.result as any)
            request.onerror = () => reject(request.error)
          })
        ),

        update: (data: any) => executeWithTransaction(
          'readwrite',
          (store: any) => new Promise((resolve, reject) => {
            const request = store.put(data)
            request.onsuccess = () => resolve(request.result as IDBValidKey)
            request.onerror = () => reject(request.error)
          })
        ),

        delete: (key: IDBValidKey) => executeWithTransaction(
          'readwrite',
          (store: any) => new Promise((resolve, reject) => {
            const request = store.delete(key)
            request.onsuccess = () => resolve(undefined)
            request.onerror = () => reject(request.error)
          })
        ),

        getAll: () => executeWithTransaction(
          'readonly',
          (store: any) => new Promise((resolve, reject) => {
            const request = store.getAll()
            request.onsuccess = () => resolve(request.result as any[])
            request.onerror = () => reject(request.error)
          })
        ),
        clearAll: () => executeWithTransaction(
          'readwrite',
          (store: any) => new Promise((resolve, reject) => {
            const request = store.clear()
            request.onsuccess = () => resolve(true)
            request.onerror = () => reject(request.error)
          })
        )
      }
    }
  }
})