// 比賽狀態儲存：記憶體 Map + JSON 檔案持久化（重啟後按鈕仍可用）
import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs'
import { dirname } from 'node:path'

export function createStore(filePath) {
	const matches = new Map()

	if (filePath && existsSync(filePath)) {
		try {
			const data = JSON.parse(readFileSync(filePath, 'utf8'))
			for (const [key, value] of Object.entries(data)) matches.set(key, value)
		} catch (error) {
			console.warn('讀取狀態檔失敗，將以空白狀態啟動：', error.message)
		}
	}

	function persist() {
		if (!filePath) return
		try {
			mkdirSync(dirname(filePath), { recursive: true })
			writeFileSync(filePath, JSON.stringify(Object.fromEntries(matches)), 'utf8')
		} catch (error) {
			console.warn('寫入狀態檔失敗：', error.message)
		}
	}

	const keyOf = (chatId, messageId) => `${chatId}:${messageId}`

	return {
		get: (chatId, messageId) => matches.get(keyOf(chatId, messageId)) ?? null,
		set(chatId, messageId, match) {
			matches.set(keyOf(chatId, messageId), match)
			persist()
		},
		delete(chatId, messageId) {
			matches.delete(keyOf(chatId, messageId))
			persist()
		},
		size: () => matches.size,
	}
}