const animeId = window.location.pathname.split('/').pop();
let player;

let totalEpisodes = 0;
let currentPage = 1;
const itemsPerPage = 12;

var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

let extensionName;

async function loadAnime() {
    try {
        const path = window.location.pathname;
        const parts = path.split("/").filter(Boolean);
        let animeId;

        if (parts.length === 3) {
            extensionName = parts[1];
            animeId = parts[2];
        } else {
            animeId = parts[1];
        }

        const fetchUrl = extensionName
            ? `/api/anime/${animeId.slice(0,40)}?ext=${extensionName}`
            : `/api/anime/${animeId}`;
        const res = await fetch(fetchUrl);
        const data = await res.json();

        if(data.error) {
            document.getElementById('title').innerText = "Anime Not Found";
            return;
        }

        const title = data.title?.english || data.title?.romaji || "Unknown Title";
        document.title = `${title} | WaifuBoard`;
        document.getElementById('title').innerText = title;
        if (data.coverImage?.extraLarge) {
            document.getElementById('poster').src = data.coverImage.extraLarge;
        }

        const rawDesc = data.description || "No description available.";
        handleDescription(rawDesc);

        document.getElementById('score').innerText = (data.averageScore || '?') + '% Score';
        document.getElementById('year').innerText = data.seasonYear || data.startDate?.year || '????';
        document.getElementById('genres').innerText = data.genres?.length > 0 ? data.genres.slice(0, 3).join(' • ') : '';
        document.getElementById('format').innerText = data.format || 'TV';
        document.getElementById('status').innerText = data.status || 'Unknown';
        const extensionPill = document.getElementById('extension-pill');
        if (extensionName && extensionPill) {
            extensionPill.textContent = `${extensionName.charAt(0).toUpperCase() + extensionName.slice(1).toLowerCase()}`;
            extensionPill.style.display = 'inline-flex';
        } else if (extensionPill) {
            extensionPill.style.display = 'none';
        }

        let seasonText = '';
        if (data.season && data.seasonYear) {
            seasonText = `${data.season} ${data.seasonYear}`;
        } else if (data.startDate?.year) {
            const months = ['', 'Winter', 'Winter', 'Spring', 'Spring', 'Spring', 'Summer', 'Summer', 'Summer', 'Fall', 'Fall', 'Fall', 'Winter'];
            const month = data.startDate.month || 1;
            const estimatedSeason = months[month] || '';
            seasonText = `${estimatedSeason} ${data.startDate.year}`.trim();
        }
        document.getElementById('season').innerText = seasonText || 'Unknown';

        let studioName = 'Unknown Studio';
        if (data.studios?.nodes?.length > 0) {
            studioName = data.studios.nodes[0].name;
        } else if (data.studios?.edges?.length > 0) {
            studioName = data.studios.edges[0]?.node?.name || 'Unknown Studio';
        }
        document.getElementById('studio').innerText = studioName;

        const charContainer = document.getElementById('char-list');
        charContainer.innerHTML = '';

        let characters = [];

        if (data.characters?.nodes?.length > 0) {
            characters = data.characters.nodes.slice(0, 5);
        }
        else if (data.characters?.edges?.length > 0) {
            characters = data.characters.edges
                .filter(edge => edge?.node?.name?.full)
                .slice(0, 5)
                .map(edge => edge.node);
        }

        if (characters.length > 0) {
            characters.forEach(char => {
                if (char?.name?.full) {
                    charContainer.innerHTML += `
                        <div class="character-item">
                            <div class="char-dot"></div> ${char.name.full}
                        </div>`;
                }
            });
        } else {
            charContainer.innerHTML = `
                <div class="character-item" style="color: #666;">
                    No character data available
                </div>`;
        }

        document.getElementById('watch-btn').onclick = () => {
            window.location.href = `/watch/${animeId}/1`;
        };

        if (data.trailer && data.trailer.site === 'youtube') {
            window.onYouTubeIframeAPIReady = function() {
                player = new YT.Player('player', {
                    height: '100%',
                    width: '100%',
                    videoId: data.trailer.id,
                    playerVars: {
                        'autoplay': 1, 'controls': 0, 'mute': 1,
                        'loop': 1, 'playlist': data.trailer.id,
                        'showinfo': 0, 'modestbranding': 1, 'disablekb': 1
                    },
                    events: { 'onReady': (e) => e.target.playVideo() }
                });
            };
        } else {
            const banner = data.bannerImage || data.coverImage?.extraLarge || '';
            if (banner) {
                document.querySelector('.video-background').innerHTML = `<img src="${banner}" style="width:100%; height:100%; object-fit:cover;">`;
            }
        }

        let extensionEpisodes = [];

        if (extensionName) {
            extensionEpisodes = await loadExtensionEpisodes(animeId, extensionName);

            if (extensionEpisodes.length > 0) {
                totalEpisodes = extensionEpisodes.length;
            } else {
                totalEpisodes = 1;
            }
        } else {
            // MODO NORMAL (AniList)
            if (data.nextAiringEpisode?.episode) {
                totalEpisodes = data.nextAiringEpisode.episode - 1;
            } else if (data.episodes) {
                totalEpisodes = data.episodes;
            } else {
                totalEpisodes = 12;
            }
        }

        totalEpisodes = Math.min(Math.max(totalEpisodes, 1), 5000);
        document.getElementById('episodes').innerText = totalEpisodes;

        renderEpisodes();

    } catch (err) {
        console.error('Error loading anime:', err);
        document.getElementById('title').innerText = "Error loading anime";
    }
}

async function loadExtensionEpisodes(animeId, extName) {
    try {
        const url = `/api/anime/${animeId}/episodes?ext=${extName}`;
        const res = await fetch(url);
        const data = await res.json();

        if (!Array.isArray(data)) return [];

        return data.map(ep => ({
            id: ep.id,
            number: ep.number,
            title: ep.title || `Episode ${ep.number}`,
            url: ep.url
        }));
    } catch (err) {
        console.error("Failed to fetch extension episodes:", err);
        return [];
    }
}


function handleDescription(text) {
    const tmp = document.createElement("DIV");
    tmp.innerHTML = text;
    const cleanText = tmp.textContent || tmp.innerText || "";

    const sentences = cleanText.match(/[^\.!\?]+[\.!\?]+/g) || [cleanText];

    document.getElementById('full-description').innerHTML = text;

    if (sentences.length > 4) {
        const shortText = sentences.slice(0, 4).join(' ');
        document.getElementById('description-preview').innerText = shortText + '...';
        document.getElementById('read-more-btn').style.display = 'inline-flex';
    } else {
        document.getElementById('description-preview').innerHTML = text;
        document.getElementById('read-more-btn').style.display = 'none';
    }
}

function openModal() {
    document.getElementById('desc-modal').classList.add('active');
    document.body.style.overflow = 'hidden';
}

function closeModal() {
    document.getElementById('desc-modal').classList.remove('active');
    document.body.style.overflow = '';
}

document.getElementById('desc-modal').addEventListener('click', (e) => {
    if (e.target.id === 'desc-modal') closeModal();
});

function renderEpisodes() {
    const grid = document.getElementById('episodes-grid');
    grid.innerHTML = '';

    const start = (currentPage - 1) * itemsPerPage + 1;
    const end = Math.min(start + itemsPerPage - 1, totalEpisodes);

    for(let i = start; i <= end; i++) {
        createEpisodeButton(i, grid);
    }
    updatePaginationControls();
}

function createEpisodeButton(num, container) {
    const btn = document.createElement('div');
    btn.className = 'episode-btn';
    btn.innerText = `Ep ${num}`;
    btn.onclick = () =>
        window.location.href = `/watch/${animeId}/${num}` + (extensionName ? `?${extensionName}` : "");

    container.appendChild(btn);
}

function updatePaginationControls() {
    const totalPages = Math.ceil(totalEpisodes / itemsPerPage);
    document.getElementById('page-info').innerText = `Page ${currentPage} of ${totalPages}`;
    document.getElementById('prev-page').disabled = currentPage === 1;
    document.getElementById('next-page').disabled = currentPage === totalPages;

    document.getElementById('pagination-controls').style.display = 'flex';
}

function changePage(delta) {
    currentPage += delta;
    renderEpisodes();
}

const searchInput = document.getElementById('ep-search');
searchInput.addEventListener('input', (e) => {
    const val = parseInt(e.target.value);
    const grid = document.getElementById('episodes-grid');

    if (val > 0 && val <= totalEpisodes) {
        grid.innerHTML = '';
        createEpisodeButton(val, grid);
        document.getElementById('pagination-controls').style.display = 'none';
    } else if (!e.target.value) {
        renderEpisodes();
    } else {
        grid.innerHTML = '<div style="color:#666; width:100%; text-align:center;">Episode not found</div>';
        document.getElementById('pagination-controls').style.display = 'none';
    }
});

loadAnime();