import { state } from './state.js';
import { addItemsToStore, clearStore, getFromDB } from './db.js';
import { showNotification, _, emitirEventoActualizacion } from './utils.js';

async function authenticateJellyfin(url, username, password) {
    const authUrl = `${url}/Users/AuthenticateByName`;
    const body = JSON.stringify({
        Username: username,
        Pw: password
    });

    try {
        const response = await fetch(authUrl, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'X-Emby-Authorization': 'MediaBrowser Client="CinePlex", Device="Chrome", DeviceId="cineplex-jellyfin-integration", Version="1.0"'
            },
            body: body
        });

        if (!response.ok) {
            const errorData = await response.json().catch(() => ({}));
            throw new Error(errorData.AuthenticationResult?.ErrorMessage || `Error ${response.status}`);
        }

        const data = await response.json();
        return { success: true, token: data.AccessToken, userId: data.User.Id };

    } catch (error) {
        return { success: false, message: error.message };
    }
}

export async function fetchLibraryViews(url, userId, apiKey) {
    const viewsUrl = `${url}/Users/${userId}/Views`;
    try {
        const response = await fetch(viewsUrl, {
            headers: {
                'X-Emby-Token': apiKey
            }
        });
        if (!response.ok) throw new Error(`Error ${response.status} fetching library views`);
        const data = await response.json();
        return { success: true, views: data.Items };
    } catch (error) {
        return { success: false, message: error.message };
    }
}


export async function fetchItemsFromLibrary(url, userId, apiKey, library) {
    const isMusic = library.CollectionType === 'music';
    const itemTypes = isMusic ? 'MusicArtist' : 'Movie,Series';
    const fields = isMusic ? 'ImageTags' : 'ProductionYear,RunTimeTicks,SeriesName,ParentIndexNumber,ImageTags';
    const itemsUrl = `${url}/Users/${userId}/Items?ParentId=${library.Id}&recursive=true&fields=${fields}&includeItemTypes=${itemTypes}`;

    try {
        const response = await fetch(itemsUrl, {
            headers: { 'X-Emby-Token': apiKey }
        });

        if (!response.ok) throw new Error(`Error ${response.status}`);

        const data = await response.json();
        const items = data.Items.map(item => {
            const mediaStream = item.MediaStreams?.find(s => s.Type === 'Video');
            const container = item.Container;
            let resolution = null;
            if (mediaStream && mediaStream.Height) {
                if (mediaStream.Height >= 2160) resolution = '4k';
                else if (mediaStream.Height >= 1080) resolution = '1080p';
                else if (mediaStream.Height >= 720) resolution = '720p';
            }

            const baseItem = {
                id: item.Id,
                title: item.Name,
                type: item.Type,
                thumb: item.ImageTags?.Primary ? `${url}/Items/${item.Id}/Images/Primary?tag=${item.ImageTags.Primary}` : '',
                container: container,
                resolution: resolution
            };
            if (!isMusic) {
                baseItem.year = item.ProductionYear;
                baseItem.duration = item.RunTimeTicks;
                baseItem.seriesTitle = item.SeriesName;
                baseItem.seasonNumber = item.ParentIndexNumber;
            }
            return baseItem;
        });

        return { success: true, items, libraryName: library.Name, libraryId: library.Id };

    } catch (error) {
        return { success: false, message: error.message, libraryName: library.Name, libraryId: library.Id };
    }
}

export async function startJellyfinScan() {
    if (state.isScanningJellyfin) {
        showNotification(_('jellyfinScanInProgress'), 'warning');
        return;
    }
    state.isScanningJellyfin = true;

    const statusDiv = document.getElementById('jellyfinScanStatus');
    const scanBtn = document.getElementById('jellyfinScanBtn');
    const originalBtnText = scanBtn.innerHTML;
    scanBtn.innerHTML = `<span class="spinner-border spinner-border-sm me-2"></span>${_('jellyfinScanning')}`;
    scanBtn.disabled = true;

    const urlInput = document.getElementById('jellyfinServerUrl');
    const usernameInput = document.getElementById('jellyfinUsername');
    const passwordInput = document.getElementById('jellyfinPassword');

    let url = urlInput.value.trim();
    const username = usernameInput.value.trim();
    const password = passwordInput.value;

    if (!url || !username) {
        showNotification(_('jellyfinMissingCredentials'), 'error');
        state.isScanningJellyfin = false;
        scanBtn.innerHTML = originalBtnText;
        scanBtn.disabled = false;
        return;
    }
    
    url = url.replace(/\/web\/.*$/, '').replace(/\/$/, '');
    statusDiv.innerHTML = `<div class="text-info">${_('jellyfinConnecting', url)}</div>`;

    const authResult = await authenticateJellyfin(url, username, password);

    if (!authResult.success) {
        statusDiv.innerHTML = `<div class="text-danger">${_('jellyfinAuthFailed', authResult.message)}</div>`;
        showNotification(_('jellyfinAuthFailed', authResult.message), 'error');
        state.isScanningJellyfin = false;
        scanBtn.innerHTML = originalBtnText;
        scanBtn.disabled = false;
        return;
    }

    statusDiv.innerHTML = `<div class="text-success">${_('jellyfinAuthSuccess')}</div><div class="text-info">${_('jellyfinFetchingLibraries')}</div>`;
    
    const viewsResult = await fetchLibraryViews(url, authResult.userId, authResult.token);

    if (!viewsResult.success) {
        statusDiv.innerHTML += `<div class="text-danger">${_('jellyfinFetchFailed', viewsResult.message)}</div>`;
        state.isScanningJellyfin = false;
        scanBtn.innerHTML = originalBtnText;
        scanBtn.disabled = false;
        return;
    }

    const mediaLibraries = viewsResult.views.filter(v => v.CollectionType === 'movies' || v.CollectionType === 'tvshows' || v.CollectionType === 'music');
    
    if (mediaLibraries.length === 0) {
        statusDiv.innerHTML += `<div class="text-warning">${_('jellyfinNoMediaLibraries')}</div>`;
        state.isScanningJellyfin = false;
        scanBtn.innerHTML = originalBtnText;
        scanBtn.disabled = false;
        return;
    }
    
    statusDiv.innerHTML += `<div class="text-info">${_('jellyfinLibrariesFound', String(mediaLibraries.length))}</div>`;
    
    await clearStore('jellyfin_movies');
    await clearStore('jellyfin_series');
    
    const allArtists = await getFromDB('artists') || [];
    const plexArtists = allArtists.filter(a => !a.isJellyfin);
    await clearStore('artists');
    if (plexArtists.length > 0) {
        await addItemsToStore('artists', plexArtists);
    }

    let totalMovies = 0;
    let totalSeries = 0;
    let totalMusic = 0;

    const scanPromises = mediaLibraries.map(library => 
        fetchItemsFromLibrary(url, authResult.userId, authResult.token, library)
    );

    const results = await Promise.allSettled(scanPromises);
    const urlObject = new URL(url);

    for (const result of results) {
        if (result.status === 'fulfilled' && result.value.success) {
            const library = mediaLibraries.find(lib => lib.Id === result.value.libraryId);
            if (library) {
                const collectionType = library.CollectionType;
                let storeName;
                if (collectionType === 'movies') storeName = 'jellyfin_movies';
                else if (collectionType === 'tvshows') storeName = 'jellyfin_series';
                else if (collectionType === 'music') storeName = 'artists';

                if (storeName) {
                    const titulos = result.value.items;
                    if (storeName === 'artists') {
                        const jellyfinArtists = {
                            ip: urlObject.hostname,
                            puerto: urlObject.port || (urlObject.protocol === 'https:' ? '443' : '80'),
                            token: authResult.token,
                            protocolo: urlObject.protocol.replace(':', ''),
                            serverName: `Jellyfin - ${library.Name}`,
                            titulos: titulos.map(t => ({...t, isJellyfin: true, userId: authResult.userId, serverUrl: url})),
                            tokenPrincipal: authResult.token,
                            isJellyfin: true,
                            userId: authResult.userId,
                            serverUrl: url
                        };
                        if (titulos.length > 0) {
                           await addItemsToStore(storeName, [jellyfinArtists]);
                        }
                    } else {
                        const dbEntry = {
                            serverUrl: url,
                            libraryId: library.Id,
                            libraryName: library.Name,
                            titulos: titulos,
                        };
                         if (titulos.length > 0) {
                            await addItemsToStore(storeName, [dbEntry]);
                         }
                    }
                    
                    if (collectionType === 'movies') totalMovies += titulos.length;
                    else if (collectionType === 'tvshows') totalSeries += titulos.length;
                    else if (collectionType === 'music') totalMusic += titulos.length;
                    
                    statusDiv.innerHTML += `<div class="text-success-secondary">${_('jellyfinLibraryScanSuccess', [library.Name, String(titulos.length)])}</div>`;
                }
            }
        } else {
            const libraryName = result.reason?.libraryName || result.value?.libraryName || 'Unknown';
            statusDiv.innerHTML += `<div class="text-warning">${_('jellyfinLibraryScanFailed', libraryName)}</div>`;
        }
    }

    const newSettings = {
        id: 'jellyfin_credentials',
        url: url,
        username: username,
        password: password, 
        apiKey: authResult.token,
        userId: authResult.userId
    };

    await addItemsToStore('jellyfin_settings', [newSettings]);
    state.jellyfinSettings = newSettings;
    
    const message = `Scan finished. Found ${totalMovies} movies, ${totalSeries} series, and ${totalMusic} music artists.`;
    statusDiv.innerHTML += `<div class="text-success mt-2">${message}</div>`;
    showNotification(message, 'success');
    
    setTimeout(() => {
        const modalInstance = bootstrap.Modal.getInstance(document.getElementById('settingsModal'));
        if(modalInstance) modalInstance.hide();
        emitirEventoActualizacion();
    }, 2000);

    state.isScanningJellyfin = false;
    scanBtn.innerHTML = originalBtnText;
    scanBtn.disabled = false;
}