const favoritesManager = {
    apiBase: window.location.origin,
    _initialized: false,
    _loadPromise: null,

    groups: [],
    favoritesByKey: new Map(),
    favoritesById: new Map(),
    listeners: new Set(),

    getAuthHeaders() {
        const token = localStorage.getItem('accessToken');
        const apiKey = localStorage.getItem('apiKey');

        const headers = {
            'Content-Type': 'application/json'
        };

        if (token) {
            headers['Authorization'] = `Bearer ${token}`;
        } else if (apiKey) {
            headers['X-API-Key'] = apiKey;
        }

        return headers;
    },

    async fetchAPI(endpoint, options = {}) {
        const response = await fetch(`${this.apiBase}${endpoint}`, {
            ...options,
            headers: {
                ...this.getAuthHeaders(),
                ...(options.headers || {})
            }
        });

        if (!response.ok) {
            if (response.status === 401) {
                if (window.dashboard?.logout) {
                    window.dashboard.logout();
                }
                return null;
            }
            throw new Error(`API Error: ${response.status}`);
        }

        if (response.status === 204) return null;
        return response.json();
    },

    setData(groups, favorites) {
        this.groups = Array.isArray(groups) ? groups : [];
        this.favoritesByKey.clear();
        this.favoritesById.clear();

        (favorites || []).forEach(f => {
            const dc = f?.docker_container;
            if (!dc?.host_id || !dc?.container_id) return;
            const key = `${dc.host_id}::${dc.container_id}`;
            this.favoritesByKey.set(key, f);
            this.favoritesById.set(f.id, f);
        });

        this.refreshStarsInDom();
        this._emitChange();
    },

    async load() {
        const [groupsRes, favsRes] = await Promise.all([
            this.fetchAPI('/api/favorites/groups').catch(() => ({ groups: [] })),
            this.fetchAPI('/api/favorites/containers').catch(() => ({ containers: [] })),
        ]);

        this.setData(groupsRes?.groups || [], favsRes?.containers || []);
    },

    async ensureInit() {
        if (this._initialized) return;
        if (this._loadPromise) {
            await this._loadPromise;
            return;
        }

        this._loadPromise = (async () => {
            try {
                await this.load();
            } finally {
                this._initialized = true;
            }
        })();

        await this._loadPromise;
    },

    onChange(callback) {
        this.listeners.add(callback);
        return () => this.listeners.delete(callback);
    },

    _emitChange() {
        for (const cb of this.listeners) {
            try {
                cb();
            } catch (e) {
                console.error('favoritesManager listener error:', e);
            }
        }
    },

    _key(hostId, containerId) {
        return `${hostId}::${containerId}`;
    },

    isFavorite(hostId, containerId) {
        return this.favoritesByKey.has(this._key(hostId, containerId));
    },

    getFavoriteId(hostId, containerId) {
        const fav = this.favoritesByKey.get(this._key(hostId, containerId));
        return fav ? fav.id : null;
    },

    async addOrUpdateFavorite(hostId, containerId, groupId = null) {
        const created = await this.fetchAPI('/api/favorites/containers', {
            method: 'POST',
            body: JSON.stringify({
                host_id: hostId,
                container_id: containerId,
                group_id: groupId
            })
        });

        if (!created) return null;

        const key = this._key(hostId, containerId);
        this.favoritesByKey.set(key, created);
        this.favoritesById.set(created.id, created);
        this.refreshStarsInDom();
        this._emitChange();
        return created;
    },

    async moveFavoriteToGroup(hostId, containerId, groupId = null) {
        return await this.addOrUpdateFavorite(hostId, containerId, groupId);
    },

    async listGroups() {
        const res = await this.fetchAPI('/api/favorites/groups');
        this.groups = res?.groups || [];
        this._emitChange();
        return this.groups;
    },

    async createGroup({ name, sort_order = 0, color = null, icon_key = null }) {
        const created = await this.fetchAPI('/api/favorites/groups', {
            method: 'POST',
            body: JSON.stringify({ name, sort_order, color, icon_key })
        });
        await this.listGroups();
        return created;
    },

    async updateGroup(groupId, { name = null, sort_order = null, color = null, icon_key = null }) {
        const updated = await this.fetchAPI(`/api/favorites/groups/${groupId}`, {
            method: 'PATCH',
            body: JSON.stringify({ name, sort_order, color, icon_key })
        });
        await this.listGroups();
        return updated;
    },

    async deleteGroup(groupId) {
        await this.fetchAPI(`/api/favorites/groups/${groupId}`, { method: 'DELETE' });
        await this.listGroups();
        await this.load();
    },

    async removeFavoriteById(favoriteId) {
        await this.fetchAPI(`/api/favorites/containers/${favoriteId}`, { method: 'DELETE' });

        const existing = this.favoritesById.get(favoriteId);
        if (existing?.docker_container?.host_id && existing?.docker_container?.container_id) {
            const key = this._key(existing.docker_container.host_id, existing.docker_container.container_id);
            this.favoritesByKey.delete(key);
        }
        this.favoritesById.delete(favoriteId);

        this.refreshStarsInDom();
        this._emitChange();
    },

    async toggleFavorite(hostId, containerId) {
        const key = this._key(hostId, containerId);
        const existing = this.favoritesByKey.get(key);

        if (existing?.id) {
            await this.removeFavoriteById(existing.id);
            return { favorited: false };
        }

        await this.addOrUpdateFavorite(hostId, containerId, null);
        return { favorited: true };
    },

    refreshStarsInDom() {
        const buttons = document.querySelectorAll('[data-fav-key]');
        buttons.forEach(btn => {
            const key = btn.getAttribute('data-fav-key');
            const isFav = this.favoritesByKey.has(key);

            const icon = btn.querySelector('i');
            if (icon) {
                icon.classList.toggle('fas', isFav);
                icon.classList.toggle('far', !isFav);
            }

            btn.classList.toggle('text-purple-400', isFav);
            btn.classList.toggle('text-gray-400', !isFav);
            btn.setAttribute('title', isFav ? 'Retirer des favoris' : 'Ajouter aux favoris');
            btn.setAttribute('aria-pressed', isFav ? 'true' : 'false');
        });
    },
};

window.favoritesManager = favoritesManager;