import { useCallback, useEffect, useMemo, useState } from "react";
import {
    listGameCatalog,
    listGamePlatforms,
    setGameStatus,
    upsertGameCatalog,
    upsertGamePlatform,
} from "@/features/games/api";
import { useGameAbilities } from "@/features/games/permissions.js";
import { useAdminQuery } from "@/shared/hooks/useAdminQuery.js";
import { useToast } from "@/shared/ui/ToastProvider.jsx";

const defaultGameForm = {
    gameId: "",
    platformCode: "",
    providerGameId: "",
    gameName: "",
    category: "casual",
    iconUrl: "",
    coverUrl: "",
    launchMode: "h5_popup",
    orientation: "portrait",
    minCoin: 0,
    status: "active",
    sortOrder: 0,
    tagsText: "",
};

const defaultPlatformForm = {
    platformCode: "",
    platformName: "",
    status: "active",
    apiBaseUrl: "",
    sortOrder: 0,
};

const emptyCatalog = { items: [], pageSize: 50 };
const emptyPlatforms = { items: [] };
const defaultPageSize = 50;

export function useGamesPage() {
    const abilities = useGameAbilities();
    const { showToast } = useToast();
    const [platformCode, setPlatformCode] = useState("");
    const [status, setStatus] = useState("");
    const [page, setPage] = useState(1);
    const [pageCursors, setPageCursors] = useState({ 1: "" });
    const [pageSize, setPageSize] = useState(defaultPageSize);
    const [activeAction, setActiveAction] = useState("");
    const [editingGameId, setEditingGameId] = useState("");
    const [editingPlatformCode, setEditingPlatformCode] = useState("");
    const [gameForm, setGameForm] = useState(defaultGameForm);
    const [platformForm, setPlatformForm] = useState(defaultPlatformForm);
    const [loadingAction, setLoadingAction] = useState("");

    const platformsQueryFn = useCallback(() => listGamePlatforms(), []);
    const {
        data: platformData = emptyPlatforms,
        error: platformError,
        loading: platformsLoading,
        reload: reloadPlatforms,
    } = useAdminQuery(platformsQueryFn, {
        errorMessage: "加载游戏平台失败",
        initialData: emptyPlatforms,
        queryKey: ["games", "platforms"],
    });

    const catalogQueryFn = useCallback(
        () => listGameCatalog({ cursor: pageCursors[page] || "", platformCode, status, pageSize }),
        [page, pageCursors, pageSize, platformCode, status],
    );
    const {
        data = emptyCatalog,
        error,
        loading,
        reload,
    } = useAdminQuery(catalogQueryFn, {
        errorMessage: "加载游戏列表失败",
        initialData: emptyCatalog,
        keepPreviousData: true,
        queryKey: ["games", "catalog", platformCode, status, pageSize, page, pageCursors[page] || ""],
    });

    const platformOptions = useMemo(
        () => (platformData.items || []).map((platform) => [platform.platformCode, platform.platformName]),
        [platformData.items],
    );

    useEffect(() => {
        if (!gameForm.platformCode && platformOptions.length > 0 && activeAction === "create-game") {
            setGameForm((current) => ({ ...current, platformCode: platformOptions[0][0] }));
        }
    }, [activeAction, gameForm.platformCode, platformOptions]);

    const resetCatalogPage = () => {
        setPage(1);
        setPageCursors({ 1: "" });
    };

    const changePlatformCode = (value) => {
        setPlatformCode(value);
        resetCatalogPage();
    };

    const changeStatus = (value) => {
        setStatus(value);
        resetCatalogPage();
    };

    const changePageSize = (value) => {
        setPageSize(value);
        resetCatalogPage();
    };

    const changePage = (nextPage) => {
        if (nextPage < 1 || nextPage === page) {
            return;
        }
        if (nextPage === page + 1) {
            if (!data.nextCursor) {
                return;
            }
            setPageCursors((current) => ({ ...current, [nextPage]: data.nextCursor }));
        }
        setPage(nextPage);
    };

    const resetFilters = () => {
        setPlatformCode("");
        setStatus("");
        setPageSize(defaultPageSize);
        resetCatalogPage();
    };

    const openCreateGame = () => {
        setEditingGameId("");
        setGameForm({ ...defaultGameForm, platformCode: platformOptions[0]?.[0] || "" });
        setActiveAction("create-game");
    };

    const openEditGame = (game) => {
        setEditingGameId(game.gameId);
        setGameForm(gameToForm(game));
        setActiveAction("edit-game");
    };

    const openCreatePlatform = () => {
        setEditingPlatformCode("");
        setPlatformForm(defaultPlatformForm);
        setActiveAction("create-platform");
    };

    const openEditPlatform = (platform) => {
        setEditingPlatformCode(platform.platformCode);
        setPlatformForm(platformToForm(platform));
        setActiveAction("edit-platform");
    };

    const closeAction = () => {
        setActiveAction("");
        setEditingGameId("");
        setEditingPlatformCode("");
    };

    const submitGame = async (event) => {
        event.preventDefault();
        const payload = gamePayload(gameForm);
        setLoadingAction(activeAction);
        try {
            await upsertGameCatalog(payload, editingGameId);
            await reload();
            showToast(editingGameId ? "游戏已更新" : "游戏已创建", "success");
            closeAction();
        } catch (err) {
            showToast(err.message || "保存游戏失败", "error");
        } finally {
            setLoadingAction("");
        }
    };

    const submitPlatform = async (event) => {
        event.preventDefault();
        const payload = platformPayload(platformForm);
        setLoadingAction(activeAction);
        try {
            await upsertGamePlatform(payload, editingPlatformCode);
            await reloadPlatforms();
            await reload();
            showToast(editingPlatformCode ? "平台已更新" : "平台已创建", "success");
            closeAction();
        } catch (err) {
            showToast(err.message || "保存平台失败", "error");
        } finally {
            setLoadingAction("");
        }
    };

    const changeGameStatus = async (game, checked) => {
        const nextStatus = checked ? "active" : "maintenance";
        setLoadingAction(`status-${game.gameId}`);
        try {
            await setGameStatus(game.gameId, nextStatus);
            await reload();
            showToast("游戏状态已更新", "success");
        } catch (err) {
            showToast(err.message || "状态更新失败", "error");
        } finally {
            setLoadingAction("");
        }
    };

    return {
        abilities,
        activeAction,
        changeGameStatus,
        closeAction,
        data,
        error: error || platformError,
        gameForm,
        loading: loading || platformsLoading,
        loadingAction,
        page,
        openCreateGame,
        openCreatePlatform,
        openEditGame,
        openEditPlatform,
        pageSize,
        platformCode,
        platformData,
        platformForm,
        platformOptions,
        reload,
        resetFilters,
        changePage,
        changePageSize,
        setGameForm,
        setPlatformCode: changePlatformCode,
        setPlatformForm,
        setStatus: changeStatus,
        status,
        submitGame,
        submitPlatform,
    };
}

function gameToForm(game) {
    return {
        gameId: game.gameId || "",
        platformCode: game.platformCode || "",
        providerGameId: game.providerGameId || "",
        gameName: game.gameName || "",
        category: game.category || "casual",
        iconUrl: game.iconUrl || "",
        coverUrl: game.coverUrl || "",
        launchMode: game.launchMode || "h5_popup",
        orientation: game.orientation || "portrait",
        minCoin: Number(game.minCoin || 0),
        status: game.status || "active",
        sortOrder: Number(game.sortOrder || 0),
        tagsText: (game.tags || []).join(", "),
    };
}

function platformToForm(platform) {
    return {
        platformCode: platform.platformCode || "",
        platformName: platform.platformName || "",
        status: platform.status || "active",
        apiBaseUrl: platform.apiBaseUrl || "",
        sortOrder: Number(platform.sortOrder || 0),
    };
}

function gamePayload(form) {
    return {
        gameId: form.gameId.trim(),
        platformCode: form.platformCode.trim(),
        providerGameId: form.providerGameId.trim(),
        gameName: form.gameName.trim(),
        category: form.category.trim(),
        iconUrl: form.iconUrl.trim(),
        coverUrl: form.coverUrl.trim(),
        launchMode: form.launchMode.trim() || "h5_popup",
        orientation: form.orientation.trim() || "portrait",
        minCoin: Number(form.minCoin || 0),
        status: form.status.trim() || "active",
        sortOrder: Number(form.sortOrder || 0),
        tags: form.tagsText
            .split(",")
            .map((tag) => tag.trim())
            .filter(Boolean),
    };
}

function platformPayload(form) {
    return {
        platformCode: form.platformCode.trim(),
        platformName: form.platformName.trim(),
        status: form.status.trim() || "active",
        apiBaseUrl: form.apiBaseUrl.trim(),
        sortOrder: Number(form.sortOrder || 0),
    };
}