import { createContext, useCallback, useContext, useState } from "react";
import api from "@/utils/api.util";
import { toast } from "sonner";

const NotificationBroadcastsContext = createContext(null);

export function useNotificationBroadcasts() {
    const ctx = useContext(NotificationBroadcastsContext);
    if (!ctx) throw new Error("useNotificationBroadcasts must be used within a NotificationBroadcastsProvider");
    return ctx;
}

// ─── Initial States ────────────────────────────────────────────────────────────

const PAGINATION_INIT = {
    page: 1,
    limit: 10,
    totalRecords: 0,
    totalPages: 0,
    hasPrevPage: false,
    hasNextPage: false,
};

export function NotificationBroadcastsProvider({ children }) {
    const [broadcasts, setBroadcasts] = useState([]);
    const [attributes, setAttributes] = useState([]);
    const [pagination, setPagination] = useState(PAGINATION_INIT);
    const [selectedBroadcast, setSelectedBroadcast] = useState(null);
    const [stickyBannerSetting, setStickyBannerSetting] = useState(null);
    const [loading, setLoading] = useState(false);

    const request = useCallback(async (fn) => {
        setLoading(true);
        try {
            return await fn();
        } catch (err) {
            const message = err?.response?.data?.message ?? "Something went wrong.";
            toast(message);
            return null;
        } finally {
            setLoading(false);
        }
    }, []);

    // ─── GET /api/admin/announcements ─────────────────────────────────────────
    const fetchBroadcasts = useCallback(
        ({ page = 1, limit = 10, filters = [], sort = [] } = {}) =>
            request(async () => {
                const { data } = await api.get("/admin/announcements", {
                    params: {
                        page, limit,
                        filters: filters.length ? JSON.stringify(filters) : undefined,
                        sort: sort.length ? JSON.stringify(sort) : undefined,
                    },
                });
                const result = data?.data;
                setBroadcasts(result?.data ?? []);
                setPagination(result?.pagination ?? PAGINATION_INIT);
                setAttributes(result.attributes);
                return data.data;
            }),
        [request]
    );

    // ─── GET /api/admin/announcements/:broadcastId ───────────────────────────
    const fetchBroadcast = useCallback(
        (broadcastId) =>
            request(async () => {
                const res = await api.get(`/admin/announcements/${broadcastId}`);
                setSelectedBroadcast(res.data?.data?.data ?? null);
                return res.data;
            }),
        [request]
    );

    // ─── GET /api/admin/announcements/archived ────────────────────────────────
    const fetchArchivedBroadcasts = useCallback(
        ({ page = 1, limit = 10, filters = [], sort = [] } = {}) =>
            request(async () => {
                const { data } = await api.get("/admin/announcements/archived", {
                    params: {
                        page, limit,
                        filters: filters.length ? JSON.stringify(filters) : undefined,
                        sort: sort.length ? JSON.stringify(sort) : undefined,
                    },
                });
                const final_data = data?.data;
                setBroadcasts(final_data?.data ?? []);
                setPagination(final_data?.pagination ?? PAGINATION_INIT);
                setAttributes(final_data.attributes);
                return data;
            }),
        [request]
    );

    // ─── POST /api/admin/announcements ────────────────────────────────────────
    const createBroadcast = useCallback(
        (fields) =>
            request(async () => {
                const res = await api.post("/admin/announcements", fields);
                const broadcast = res.data?.data?.data ?? null;
                if (broadcast) {
                    setBroadcasts((prev) => [broadcast, ...prev]);
                    toast("Notification broadcast created.");
                }
                return res.data;
            }),
        [request]
    );

    // ─── PATCH /api/admin/announcements/:broadcastId ─────────────────────────
    const updateBroadcast = useCallback(
        (broadcastId, fields) =>
            request(async () => {
                const res = await api.patch(`/admin/announcements/${broadcastId}`, fields);
                const broadcast = res.data?.data?.data ?? null;
                if (broadcast) {
                    setBroadcasts((prev) => prev.map((b) => (b.broadcast_id === broadcastId ? broadcast : b)));
                    setSelectedBroadcast(broadcast);
                    toast("Notification broadcast updated.");
                }
                return res.data;
            }),
        [request]
    );

    // ─── PATCH /api/admin/announcements/:broadcastId/send ────────────────────
    const sendBroadcast = useCallback(
        (broadcastId) =>
            request(async () => {
                const res = await api.patch(`/admin/announcements/${broadcastId}/send`);
                const broadcast = res.data?.data?.data ?? null;
                if (broadcast) {
                    setBroadcasts((prev) => prev.map((b) => (b.broadcast_id === broadcastId ? broadcast : b)));
                    setSelectedBroadcast(broadcast);
                    toast("Notification broadcast sent.");
                }
                return res.data;
            }),
        [request]
    );

    // ─── DELETE /api/admin/announcements/:broadcastId ────────────────────────
    const archiveBroadcast = useCallback(
        (broadcastId, { deletedBy } = {}) =>
            request(async () => {
                const res = await api.delete(`/admin/announcements/${broadcastId}`, {
                    data: { deletedBy },
                });
                setBroadcasts((prev) => prev.filter((b) => b.broadcast_id !== broadcastId));
                setSelectedBroadcast((prev) => (prev?.broadcast_id === broadcastId ? null : prev));
                toast("Notification broadcast archived.");
                return res.data;
            }),
        [request]
    );

    // ─── DELETE /api/admin/announcements/bulk ─────────────────────────────────
    const archiveBroadcasts = useCallback(
        ({ ids }, { deletedBy } = {}) =>
            request(async () => {
                const res = await api.delete("/admin/announcements/bulk", {
                    data: { ids, deletedBy },
                });
                setBroadcasts((prev) => prev.filter((b) => !ids.includes(b.broadcast_id)));
                toast(`${ids.length} notification broadcast(s) archived.`);
                return res.data;
            }),
        [request]
    );

    // ─── PATCH /api/admin/announcements/:broadcastId/restore ─────────────────
    const restoreBroadcast = useCallback(
        (broadcastId) =>
            request(async () => {
                const res = await api.patch(`/admin/announcements/${broadcastId}/restore`);
                const broadcast = res.data?.data?.data ?? null;
                if (broadcast) {
                    setBroadcasts((prev) => prev.filter((b) => b.broadcast_id !== broadcastId));
                    toast("Notification broadcast restored.");
                }
                return res.data;
            }),
        [request]
    );

    // ─── PATCH /api/admin/announcements/bulk-restore ──────────────────────────
    const restoreBroadcasts = useCallback(
        ({ ids }) =>
            request(async () => {
                const res = await api.patch("/admin/announcements/bulk-restore", { ids });
                setBroadcasts((prev) => prev.filter((b) => !ids.includes(b.broadcast_id)));
                toast(`${ids.length} notification broadcast(s) restored.`);
                return res.data;
            }),
        [request]
    );

    // ─── DELETE /api/admin/announcements/:broadcastId/permanent ──────────────
    const permanentlyDeleteBroadcast = useCallback(
        (broadcastId) =>
            request(async () => {
                const res = await api.delete(`/admin/announcements/${broadcastId}/permanent`);
                setBroadcasts((prev) => prev.filter((b) => b.broadcast_id !== broadcastId));
                toast("Notification broadcast permanently deleted.");
                return res.data;
            }),
        [request]
    );

    // ─── GET /api/admin/announcements/sticky-banner ───────────────────────────
    // Shared banner image for the whole rotating sticky bar — one image for
    // all (up to 3) concurrently-active announcements, not one per announcement.
    const fetchStickyBannerSetting = useCallback(
        () =>
            request(async () => {
                const res = await api.get("/admin/announcements/sticky-banner");
                const setting = res.data?.data?.data ?? null;
                setStickyBannerSetting(setting);
                return res.data;
            }),
        [request]
    );

    // ─── PATCH /api/admin/announcements/sticky-banner ────────────────────────
    const updateStickyBannerSetting = useCallback(
        (fields) =>
            request(async () => {
                const res = await api.patch("/admin/announcements/sticky-banner", fields);
                const setting = res.data?.data?.data ?? null;
                if (setting) {
                    setStickyBannerSetting((prev) => ({ ...prev, ...setting }));
                    toast("Sticky banner image updated.");
                }
                return res.data;
            }),
        [request]
    );

    // ─── DELETE /api/admin/announcements/bulk/permanent ──────────────────────
    const permanentlyDeleteBroadcasts = useCallback(
        ({ ids }) =>
            request(async () => {
                const res = await api.delete("/admin/announcements/bulk/permanent", { data: { ids } });
                setBroadcasts((prev) => prev.filter((b) => !ids.includes(b.broadcast_id)));
                toast(`${ids.length} notification broadcast(s) permanently deleted.`);
                return res.data;
            }),
        [request]
    );

    return (
        <NotificationBroadcastsContext.Provider value={{
            broadcasts,
            attributes,
            pagination,
            selectedBroadcast,
            stickyBannerSetting,
            loading,
            setPagination,
            setSelectedBroadcast,
            fetchBroadcasts,
            fetchBroadcast,
            fetchArchivedBroadcasts,
            createBroadcast,
            updateBroadcast,
            sendBroadcast,
            archiveBroadcast,
            archiveBroadcasts,
            restoreBroadcast,
            restoreBroadcasts,
            permanentlyDeleteBroadcast,
            permanentlyDeleteBroadcasts,
            fetchStickyBannerSetting,
            updateStickyBannerSetting,
        }}>
            {children}
        </NotificationBroadcastsContext.Provider>
    );
}