// 简单的 IndexedDB 封装
const DB_NAME = 'SpreadsheetDB'
const STORE_NAME = 'sheets'
const DB_VERSION = 1

const openDB = () => {
    return new Promise((resolve, reject) => {
        const request = indexedDB.open(DB_NAME, DB_VERSION)

        request.onupgradeneeded = (event) => {
            const db = event.target.result
            if (!db.objectStoreNames.contains(STORE_NAME)) {
                db.createObjectStore(STORE_NAME)
            }
        }

        request.onsuccess = () => resolve(request.result)
        request.onerror = () => reject(request.error)
    })
}

export const db = {
    async get(key) {
        const db = await openDB()
        return new Promise((resolve, reject) => {
            const transaction = db.transaction(STORE_NAME, 'readonly')
            const store = transaction.objectStore(STORE_NAME)
            const request = store.get(key)
            request.onsuccess = () => resolve(request.result)
            request.onerror = () => reject(request.error)
        })
    },

    async set(key, value) {
        const db = await openDB()
        return new Promise((resolve, reject) => {
            const transaction = db.transaction(STORE_NAME, 'readwrite')
            const store = transaction.objectStore(STORE_NAME)
            // 使用 JSON.parse(JSON.stringify()) 去除 Proxy 对象，确保存储的是纯数据
            const rawValue = JSON.parse(JSON.stringify(value))
            const request = store.put(rawValue, key)
            request.onsuccess = () => resolve()
            request.onerror = () => reject(request.error)
        })
    }
}