import { CONFIG } from '../../src/utils/config.js';

export const CONFIG_HYDRACKER = {
    get BASE_URL() { return (CONFIG.HYDRACKER_URL || '').replace(/\/$/, ''); },
    get API_KEY() { return CONFIG.HYDRACKER_API_KEY; },
    get TIMEOUT() { return CONFIG.HYDRACKER_TIMEOUT || 15000; },
};

export function getHydrackerHeaders() {
    return {
        'Accept': 'application/json',
        'Authorization': `Bearer ${CONFIG_HYDRACKER.API_KEY}`,
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36'
    };
}

async function fetchWithRetry(
    url: string,
    options: RequestInit = {},
    maxRetries: number = 2,
    initialDelay: number = 2000
): Promise<Response> {
    let attempt = 0;
    let delay = initialDelay;

    while (true) {
        attempt++;
        const controller = new AbortController();
        const timeoutId = setTimeout(() => controller.abort(), CONFIG_HYDRACKER.TIMEOUT);

        try {
            const res = await fetch(url, {
                ...options,
                signal: controller.signal
            });
            clearTimeout(timeoutId);

            if (res.status === 502 || res.status === 503 || res.status === 504 || res.status === 429) {
                if (attempt < maxRetries) {
                    console.warn(`[Hydracker-API] Attempt ${attempt}/${maxRetries} returned HTTP ${res.status} on fetch. Retrying in ${delay}ms...`);
                    await new Promise(resolve => setTimeout(resolve, delay));
                    delay *= 2;
                    continue;
                }
            }
            return res;
        } catch (err: any) {
            clearTimeout(timeoutId);
            const isTimeout = err.name === 'AbortError' || err.message?.includes('aborted');
            if (attempt < maxRetries) {
                const waitTime = isTimeout ? 1000 : delay;
                console.warn(`[Hydracker-API] Attempt ${attempt}/${maxRetries} failed/timed out (${err.message}). Retrying in ${waitTime}ms...`);
                await new Promise(resolve => setTimeout(resolve, waitTime));
                if (!isTimeout) delay *= 2;
                continue;
            }
            throw err;
        }
    }
}

export async function apiGet(urlPath: string, params: Record<string, any> = {}) {
    let qs = Object.entries(params).map(([k, v]) => `${k}=${encodeURIComponent(v)}`).join('&');
    // FIX: Hydracker API returns 401 if ':' is URL-encoded as '%3A'
    qs = qs.replace(/%3A/g, ':');
    const url = `${CONFIG_HYDRACKER.BASE_URL}/api/v1/${urlPath}` + (qs ? `?${qs}` : '');
    try {
        const res = await fetchWithRetry(url, {
            headers: getHydrackerHeaders()
        });
        if (!res.ok) {
            console.error(`[Hydracker-API] apiGet HTTP ${res.status} on ${urlPath}`);
            return null;
        }
        return await res.json();
    } catch (e: any) {
        console.error(`[Hydracker-API] apiGet Error on ${urlPath}:`, e.message);
        return null;
    }
}

export async function apiPost(urlPath: string, body: any = {}) {
    const url = `${CONFIG_HYDRACKER.BASE_URL}/api/v1/${urlPath}`;
    try {
        const res = await fetchWithRetry(url, {
            method: 'POST',
            headers: { ...getHydrackerHeaders(), 'Content-Type': 'application/json' },
            body: JSON.stringify(body)
        });
        return { status: res.status, body: await res.text() };
    } catch (e: any) {
        console.error(`[Hydracker-API] apiPost Error on ${urlPath}:`, e.message);
        return null;
    }
}

export async function fetchSearch(query: string) {
    const url = `${CONFIG_HYDRACKER.BASE_URL}/api/v1/titles?query=${encodeURIComponent(query)}`;
    try {
        const res = await fetchWithRetry(url, {
            headers: getHydrackerHeaders()
        });
        if (!res.ok) {
            console.error(`[Hydracker-API] Search HTTP ${res.status} for "${query}"`);
            return null;
        }
        const data = await res.json();
        // Transform the new API structure to match the old expected structure
        if (data && data.pagination && Array.isArray(data.pagination.data)) {
            return { results: data.pagination.data };
        }
        return data;
    } catch (e: any) {
        console.error('[Hydracker-API] Search failed:', e.message);
        return null;
    }
}

export async function fetchMovieLinks(titleId: string) {
    const url = `${CONFIG_HYDRACKER.BASE_URL}/api/v1/titles/${titleId}/download`;
    try {
        const res = await fetchWithRetry(url, {
            headers: getHydrackerHeaders()
        });
        if (!res.ok) return null;
        return await res.json();
    } catch (e: any) {
        return null;
    }
}

/**
 * Récupère la page de download d'un titre.
 * - Films : GET /titles/{id}/download
 * - Séries : GET /titles/{id}/season/{s}/episode/{e}/download
 * 
 * Retourne l'objet complet contenant: video, alternative_videos, title.seasons, last_episode, etc.
 */
export async function fetchDownloadPage(titleId: string, season?: number, episode?: number) {
    let urlPath: string;
    if (season && season > 0 && episode && episode > 0) {
        urlPath = `titles/${titleId}/season/${season}/episode/${episode}/download`;
    } else if (season && season > 0) {
        // On demande le premier épisode de la saison pour obtenir les métadonnées
        urlPath = `titles/${titleId}/season/${season}/episode/1/download`;
    } else {
        urlPath = `titles/${titleId}/download`;
    }
    return await apiGet(urlPath);
}

/**
 * Récupère TOUS les liens d'une saison en itérant sur chaque épisode via /download.
 * Utilise last_episode pour savoir combien d'épisodes ont des liens.
 */
export async function fetchSeriesLiens(titleId: string, season: number = 1) {
    // D'abord, obtenir les métadonnées pour savoir combien d'épisodes il y a
    const firstPage = await fetchDownloadPage(titleId, season, 1);
    if (!firstPage) return [];

    const lastEpisodeMap = firstPage.last_episode || {};
    const lastEp = lastEpisodeMap[String(season)] || 0;
    
    if (lastEp === 0) return [];

    // Collecter les liens de tous les épisodes
    const allLiens: any[] = [];
    
    // Extraire les liens du premier épisode qu'on a déjà chargé
    const extractLiens = (downloadData: any) => {
        const liens: any[] = [];
        if (downloadData.video) liens.push(downloadData.video);
        if (downloadData.alternative_videos) {
            for (const av of downloadData.alternative_videos) {
                // Éviter les doublons (video est souvent dans alternative_videos aussi)
                if (!liens.find(l => l.id === av.id)) {
                    liens.push(av);
                }
            }
        }
        return liens;
    };

    allLiens.push(...extractLiens(firstPage));

    // Charger les épisodes suivants (2 à lastEp)
    for (let ep = 2; ep <= lastEp; ep++) {
        const epData = await fetchDownloadPage(titleId, season, ep);
        if (epData) {
            allLiens.push(...extractLiens(epData));
        }
    }

    return allLiens;
}