// LinkSync Background Script
// Handles bookmark synchronization with LinkSyncServer

const Background = {
    syncInterval: null,
    SYNC_CHECK_INTERVAL: 300000,

    async init() {
        console.log("LinkSync: Initializing background script");

        await API.init();

        browser.runtime.onInstalled.addListener(() => {
            console.log("LinkSync: Extension installed");
            this.startAutoSync();
        });

        browser.runtime.onMessage.addListener(this.handleMessage.bind(this));

        browser.bookmarks.onCreated.addListener(this.onBookmarkChanged.bind(this));
        browser.bookmarks.onChanged.addListener(this.onBookmarkChanged.bind(this));
        browser.bookmarks.onRemoved.addListener(this.onBookmarkChanged.bind(this));

        const settings = await browser.storage.local.get(["linksync_auto_sync"]);
        if (settings.linksync_auto_sync) {
            this.startAutoSync();
        }
    },

    startAutoSync() {
        if (this.syncInterval) {
            clearInterval(this.syncInterval);
        }
        this.syncInterval = setInterval(() => this.runSync(), this.SYNC_CHECK_INTERVAL);
        console.log("LinkSync: Auto-sync started (every 5 minutes)");
    },

    stopAutoSync() {
        if (this.syncInterval) {
            clearInterval(this.syncInterval);
            this.syncInterval = null;
        }
    },

    async onBookmarkChanged(id, changeInfo) {
        const settings = await browser.storage.local.get(["linksync_auto_sync"]);
        if (settings.linksync_auto_sync) {
            await browser.storage.local.set({ linksync_pending: true });
        }
    },

    async handleMessage(message, sender) {
        switch (message.type) {
            case "SYNC_NOW":
                return this.runSync();

            case "GET_SETTINGS":
                return browser.storage.local.get([
                    "linksync_server_url",
                    "linksync_api_key",
                    "linksync_sync_mode",
                    "linksync_deletions",
                    "linksync_auto_sync",
                    "linksync_last_sync",
                ]);

            case "SAVE_SETTINGS":
                await browser.storage.local.set(message.data);
                await API.init();
                if (message.data.linksync_auto_sync) {
                    this.startAutoSync();
                } else {
                    this.stopAutoSync();
                }
                return { success: true };

            case "TEST_CONNECTION":
                try {
                    await API.testConnection();
                    return { success: true };
                } catch (e) {
                    return { success: false, error: e.message };
                }

            case "LOGIN":
                try {
                    const data = await API.login(message.data.username, message.data.password);
                    return { success: true, token: data.access_token };
                } catch (e) {
                    return { success: false, error: e.message };
                }

            case "GET_BOOKMARKS":
                return API.getLinks(message.data || {});

            case "CREATE_BOOKMARK":
                return API.createLink(message.data);

            case "UPDATE_BOOKMARK":
                return API.updateLink(message.data.id, message.data);

            case "DELETE_BOOKMARK":
                return API.deleteLink(message.data.id);

            case "GET_COLLECTIONS":
                return CollectionManager.listCollections();

            case "EXECUTE_QUERY":
                return CollectionManager.executeQuery(message.data.expression, message.data.limit);

            case "PARSE_QUERY":
                return CollectionManager.parseQuery(message.data.expression);

            default:
                return null;
        }
    },

    async runSync() {
        try {
            await browser.storage.local.set({ linksync_syncing: true });

            const actions = await SyncEngine.runSync();

            await browser.storage.local.set({
                linksync_syncing: false,
                linksync_last_sync: new Date().toISOString(),
                linksync_pending: false,
                linksync_sync_result: actions,
            });

            console.log(`LinkSync: Sync completed with ${actions.length} actions`);
            return { success: true, actions };
        } catch (error) {
            console.error("LinkSync: Sync failed:", error);
            await browser.storage.local.set({
                linksync_syncing: false,
                linksync_sync_error: error.message,
            });
            return { success: false, error: error.message };
        }
    },
};

document.addEventListener("DOMContentLoaded", () => Background.init());