"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var __param = (this && this.__param) || function (paramIndex, decorator) {
    return function (target, key) { decorator(target, key, paramIndex); }
};
var DistributedLockService_1;
Object.defineProperty(exports, "__esModule", { value: true });
exports.DistributedLockService = void 0;
const common_1 = require("@nestjs/common");
const crypto_1 = require("crypto");
const redis_service_1 = require("./redis.service");
let DistributedLockService = DistributedLockService_1 = class DistributedLockService {
    redisService;
    logger = new common_1.Logger(DistributedLockService_1.name);
    LOCK_PREFIX = 'distributed_lock:';
    constructor(redisService) {
        this.redisService = redisService;
    }
    async acquireLock(resource, options = {}) {
        const { ttl = 10000, retryDelay = 100, maxRetries = 10 } = options;
        const lockKey = `${this.LOCK_PREFIX}${resource}`;
        const identifier = (0, crypto_1.randomUUID)();
        let retries = 0;
        while (retries < maxRetries) {
            try {
                const result = await this.redisService.client.set(lockKey, identifier, 'PX', ttl, 'NX');
                if (result === 'OK') {
                    return { success: true, identifier };
                }
            }
            catch (err) {
                this.logger.error(`Redis error acquiring lock: ${resource}`, err);
                return { success: false };
            }
            if (retries < maxRetries - 1) {
                await this.delay(retryDelay);
            }
            retries++;
        }
        return { success: false };
    }
    async releaseLock(resource, identifier) {
        try {
            const lockKey = `${this.LOCK_PREFIX}${resource}`;
            const luaScript = `
        if redis.call("GET", KEYS[1]) == ARGV[1] then
          return redis.call("DEL", KEYS[1])
        else
          return 0
        end
      `;
            const result = await this.redisService.client.eval(luaScript, 1, lockKey, identifier);
            return result === 1;
        }
        catch (err) {
            this.logger.warn(`Failed to release lock: ${resource}`, err);
            return false;
        }
    }
    async renewLock(resource, identifier, ttl) {
        try {
            const lockKey = `${this.LOCK_PREFIX}${resource}`;
            const luaScript = `
        if redis.call("GET", KEYS[1]) == ARGV[1] then
          return redis.call("PEXPIRE", KEYS[1], ARGV[2])
        else
          return 0
        end
      `;
            const result = await this.redisService.client.eval(luaScript, 1, lockKey, identifier, ttl.toString());
            return result === 1;
        }
        catch {
            return false;
        }
    }
    async withLock(resource, task, options = {}) {
        const { ttl = 10000, timeout = 0 } = options;
        const lockResult = await this.acquireLock(resource, options);
        if (!lockResult.success) {
            if (options.fallback) {
                return options.fallback(0);
            }
            throw new Error(`Failed to acquire lock for resource: ${resource}`);
        }
        const identifier = lockResult.identifier;
        const renewInterval = Math.floor(ttl / 3);
        const renewTimer = setInterval(() => {
            this.renewLock(resource, identifier, ttl).catch(() => { });
        }, renewInterval);
        let result;
        try {
            if (timeout > 0) {
                result = await Promise.race([
                    task(),
                    new Promise((_, reject) => setTimeout(() => reject(new Error(`Lock task timed out: ${resource}`)), timeout)),
                ]);
            }
            else {
                result = await task();
            }
            return result;
        }
        finally {
            if (renewTimer) {
                clearInterval(renewTimer);
                renewTimer.unref?.();
            }
            await this.releaseLock(resource, identifier);
        }
    }
    delay(ms) {
        return new Promise((resolve) => setTimeout(resolve, ms));
    }
};
exports.DistributedLockService = DistributedLockService;
exports.DistributedLockService = DistributedLockService = DistributedLockService_1 = __decorate([
    (0, common_1.Injectable)(),
    __param(0, (0, common_1.Inject)(redis_service_1.RedisService)),
    __metadata("design:paramtypes", [redis_service_1.RedisService])
], DistributedLockService);
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