"use strict";
/**
 * Suno API HTTP client with rate limiting, proxy support, retries and polling helpers.
 *
 * Rate limit: 20 requests per 10 seconds (sunoapi.org).
 * Proxy support via SUNO_HTTP_PROXY / HTTPS_PROXY / HTTP_PROXY env vars.
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.SunoClient = void 0;
const undici_1 = require("undici");
function getProxyUrl() {
    return (process.env.SUNO_HTTP_PROXY ||
        process.env.HTTPS_PROXY ||
        process.env.https_proxy ||
        process.env.HTTP_PROXY ||
        process.env.http_proxy);
}
function isRetryableError(error) {
    if (error instanceof Error) {
        const msg = error.message.toLowerCase();
        return msg.includes('timeout') || msg.includes('econnreset') || msg.includes('socket') || msg.includes('fetch failed');
    }
    return false;
}
function sleep(ms) {
    return new Promise((resolve) => setTimeout(resolve, ms));
}
class SunoClient {
    baseUrl = 'https://api.sunoapi.org/api/v1';
    apiKey;
    maxRequests = 20;
    windowMs = 10_000;
    proxyAgent;
    requestTimeoutMs = 30_000;
    maxRetries = 2;
    requestTimestamps = [];
    constructor(apiKey) {
        this.apiKey = apiKey;
        const proxyUrl = getProxyUrl();
        if (proxyUrl) {
            this.proxyAgent = new undici_1.ProxyAgent(proxyUrl);
        }
    }
    /**
     * Enforce rate limit: max 20 requests per 10 seconds.
     */
    async throttle() {
        while (true) {
            const now = Date.now();
            this.requestTimestamps = this.requestTimestamps.filter((ts) => now - ts < this.windowMs);
            if (this.requestTimestamps.length < this.maxRequests) {
                this.requestTimestamps.push(now);
                return;
            }
            const oldest = this.requestTimestamps[0];
            const wait = Math.max(0, this.windowMs - (now - oldest));
            await sleep(wait);
        }
    }
    async request(method, path, body) {
        await this.throttle();
        const url = path.startsWith('http') ? path : `${this.baseUrl}${path}`;
        const headers = {
            Authorization: `Bearer ${this.apiKey}`,
            'Content-Type': 'application/json',
        };
        let lastError;
        for (let attempt = 0; attempt <= this.maxRetries; attempt++) {
            try {
                const fetchOptions = {
                    method,
                    headers,
                    body: body ? JSON.stringify(body) : undefined,
                    signal: AbortSignal.timeout(this.requestTimeoutMs),
                };
                if (this.proxyAgent) {
                    fetchOptions.dispatcher = this.proxyAgent;
                }
                const response = await (0, undici_1.fetch)(url, fetchOptions);
                const text = await response.text();
                let json;
                try {
                    json = JSON.parse(text);
                }
                catch {
                    throw new Error(`Invalid JSON response from Suno API: ${text}`);
                }
                // Retry on transient server errors / rate-limit before throwing.
                if (json.code === 429 || json.code === 503 || json.code === 504) {
                    if (attempt < this.maxRetries) {
                        const backoff = Math.min(1000 * 2 ** attempt, 8000);
                        await sleep(backoff);
                        continue;
                    }
                }
                if (json.code !== 200) {
                    throw new Error(`Suno API error ${json.code}: ${json.msg || 'unknown error'}`);
                }
                return json;
            }
            catch (error) {
                lastError = error instanceof Error ? error : new Error(String(error));
                const retryable = isRetryableError(lastError);
                if (retryable && attempt < this.maxRetries) {
                    const backoff = Math.min(1000 * 2 ** attempt, 8000);
                    await sleep(backoff);
                    continue;
                }
                throw lastError;
            }
        }
        throw lastError ?? new Error('Suno API request failed');
    }
    get(path) {
        return this.request('GET', path);
    }
    post(path, body) {
        return this.request('POST', path, body);
    }
    /**
     * Poll task status until terminal state or timeout.
     */
    async pollTaskStatus(taskId, options = {}) {
        const intervalMs = options.intervalMs ?? 15_000;
        const maxAttempts = options.maxAttempts ?? 60;
        const statusPath = options.statusPath ?? `/generate/record-info?taskId=${encodeURIComponent(taskId)}`;
        for (let attempt = 1; attempt <= maxAttempts; attempt++) {
            const result = await this.get(statusPath);
            const status = result.data.status;
            if (status === 'SUCCESS' ||
                status === 'FAILED' ||
                status === 'CREATE_TASK_FAILED' ||
                status === 'GENERATE_AUDIO_FAILED' ||
                status === 'GENERATE_LYRICS_FAILED' ||
                status === 'CALLBACK_EXCEPTION' ||
                status === 'SENSITIVE_WORD_ERROR') {
                return result.data;
            }
            if (attempt < maxAttempts) {
                await sleep(intervalMs);
            }
        }
        throw new Error(`Polling timeout for task ${taskId} after ${maxAttempts} attempts`);
    }
}
exports.SunoClient = SunoClient;
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