import { useEffect, useMemo, useState } from "react";
import { parseForm } from "@/shared/forms/validation";
import { usePaginatedQuery } from "@/shared/hooks/usePaginatedQuery.js";
import { useRegionOptions } from "@/shared/hooks/useRegionOptions.js";
import { useConfirm } from "@/shared/ui/ConfirmProvider.jsx";
import { useToast } from "@/shared/ui/ToastProvider.jsx";
import { emptyUserIdentityFilter, userIdentityFilterParams } from "@/shared/ui/userIdentityFilter.js";
import {
    banAppUser,
    listAppUsers,
    setAppUserPassword,
    unbanAppUser,
    updateAppUser,
} from "@/features/app-users/api";
import { useAppUserAbilities } from "@/features/app-users/permissions.js";
import { appUserCountrySchema, appUserPasswordSchema, appUserUpdateSchema } from "@/features/app-users/schema";
import { useCountryOptions } from "@/features/host-org/hooks/useCountryOptions.js";

const pageSize = 50;
const emptyData = { items: [], page: 1, pageSize, total: 0 };
const emptyEditForm = () => ({ avatar: "", gender: "", username: "" });
const emptyCountryForm = () => ({ country: "" });
const emptyPasswordForm = () => ({ password: "" });

export function useAppUsersPage() {
    const abilities = useAppUserAbilities();
    const confirm = useConfirm();
    const { showToast } = useToast();
    const { countryOptions, loadingCountries } = useCountryOptions();
    const { loadingRegions, regionOptions } = useRegionOptions();
    const [country, setCountry] = useState("");
    const [userFilter, setUserFilter] = useState(emptyUserIdentityFilter);
    const [regionId, setRegionId] = useState("");
    const [status, setStatus] = useState("");
    const [timeRange, setTimeRange] = useState({ endMs: "", startMs: "" });
    const [sortBy, setSortBy] = useState("created_at");
    const [sortDirection, setSortDirection] = useState("desc");
    const [page, setPage] = useState(1);
    const [activeAction, setActiveAction] = useState("");
    const [activeUser, setActiveUser] = useState(null);
    const [editForm, setEditForm] = useState(emptyEditForm);
    const [countryForm, setCountryForm] = useState(emptyCountryForm);
    const [passwordForm, setPasswordForm] = useState(emptyPasswordForm);
    const [loadingAction, setLoadingAction] = useState("");
    const [selectedUserIds, setSelectedUserIds] = useState([]);
    const [patchedUsers, setPatchedUsers] = useState({});
    const filters = useMemo(
        () => ({
            country,
            region_id: regionId,
            sort_by: sortBy,
            sort_direction: sortDirection,
            end_ms: timeRange.endMs,
            status,
            start_ms: timeRange.startMs,
            ...userIdentityFilterParams(userFilter),
        }),
        [country, regionId, sortBy, sortDirection, status, timeRange.endMs, timeRange.startMs, userFilter],
    );
    const {
        data: queryData = emptyData,
        error,
        loading,
        reload,
    } = usePaginatedQuery({
        errorMessage: "加载用户列表失败",
        fetcher: listAppUsers,
        filters,
        page,
        pageSize,
        queryKey: ["app-users", filters, page],
    });
    const data = useMemo(() => {
        const items = queryData.items || [];
        return {
            ...queryData,
            items: items.map((user) => (patchedUsers[user.userId] ? { ...user, ...patchedUsers[user.userId] } : user)),
        };
    }, [patchedUsers, queryData]);
    useEffect(() => {
        setSelectedUserIds([]);
        setPatchedUsers({});
    }, [country, page, regionId, sortBy, sortDirection, status, timeRange.endMs, timeRange.startMs, userFilter]);

    const locationFilterOptions = useMemo(() => {
        const countryItems = countryOptions.map((option) => ({
            label: `国家 · ${option.label}`,
            value: `country:${option.value}`,
        }));
        const regionItems = [
            { label: "区域 · GLOBAL · 0", value: "region:0" },
            ...regionOptions.map((option) => ({
                label: `区域 · ${option.label}`,
                value: `region:${option.value}`,
            })),
        ];
        return [...countryItems, ...regionItems];
    }, [countryOptions, regionOptions]);

    const locationFilterValue = country ? `country:${country}` : regionId !== "" ? `region:${regionId}` : "";

    const changeUserFilter = (value) => {
        setUserFilter(value);
        setPage(1);
    };

    const changeStatus = (value) => {
        setStatus(value);
        setPage(1);
    };

    const changeLocationFilter = (value) => {
        const [kind, rawValue = ""] = String(value || "").split(":");
        if (kind === "country" && rawValue) {
            setCountry(rawValue);
            setRegionId("");
        } else if (kind === "region") {
            setCountry("");
            setRegionId(rawValue);
        } else {
            setCountry("");
            setRegionId("");
        }
        setPage(1);
    };

    const changeTimeRange = (value) => {
        setTimeRange(value);
        setPage(1);
    };

    const changeSort = (field) => {
        setSortDirection((current) => (sortBy === field ? (current === "asc" ? "desc" : "asc") : "desc"));
        setSortBy(field);
        setPage(1);
    };

    const resetFilters = () => {
        setCountry("");
        setUserFilter(emptyUserIdentityFilter);
        setRegionId("");
        setStatus("");
        setTimeRange({ endMs: "", startMs: "" });
        setPage(1);
    };

    const openEdit = (user) => {
        setActiveUser(user);
        setEditForm({
            avatar: user.avatar || "",
            gender: user.gender || "",
            username: user.username || "",
        });
        setActiveAction("edit");
    };

    const openPassword = (user) => {
        setActiveUser(user);
        setPasswordForm(emptyPasswordForm());
        setActiveAction("password");
    };

    const openCountry = (user) => {
        setActiveUser(user);
        setCountryForm({ country: user.country || "" });
        setActiveAction("country");
    };

    const openCoinLedger = (user) => {
        setActiveUser(user);
        setActiveAction("coin-ledger");
    };

    const closeAction = () => {
        setActiveAction("");
        setActiveUser(null);
    };

    const submitEdit = async (event) => {
        event.preventDefault();
        if (!activeUser) {
            return;
        }
        await runAction("edit", "用户已更新", async () => {
            const payload = parseForm(appUserUpdateSchema, editForm);
            await updateAppUser(activeUser.userId, payload);
            closeAction();
            await reload();
        });
    };

    const submitCountry = async (event) => {
        event.preventDefault();
        if (!activeUser) {
            return;
        }
        await runAction("country", "国家已更新", async () => {
            const payload = parseForm(appUserCountrySchema, countryForm);
            await updateAppUser(activeUser.userId, payload);
            closeAction();
            await reload();
        });
    };

    const submitPassword = async (event) => {
        event.preventDefault();
        if (!activeUser) {
            return;
        }
        await runAction("password", "密码已设置", async () => {
            const payload = parseForm(appUserPasswordSchema, passwordForm);
            await setAppUserPassword(activeUser.userId, payload);
            closeAction();
        });
    };

    const toggleBan = async (user) => {
        const banned = isBanned(user);
        await runAction(`status-${user.userId}`, banned ? "用户已解封" : "用户已封禁", async () => {
            const result = banned ? await unbanAppUser(user.userId) : await banAppUser(user.userId);
            patchUsers([mergeUserStatus(user, result, banned ? "active" : "banned")]);
            setSelectedUserIds((current) => current.filter((userId) => userId !== user.userId));
        });
    };

    const batchBan = async () => {
        const users = (data.items || []).filter((user) => selectedUserIds.includes(user.userId) && !isBanned(user));
        if (!users.length) {
            showToast("请先选择未封禁用户", "warning");
            return;
        }
        const ok = await confirm({
            confirmText: "封禁",
            message: `将封禁 ${users.length} 个用户。`,
            title: "批量封禁用户",
            tone: "danger",
        });
        if (!ok) {
            return;
        }

        setLoadingAction("batch-ban");
        try {
            const results = await Promise.allSettled(users.map((user) => banAppUser(user.userId)));
            const updatedUsers = results
                .map((result, index) =>
                    result.status === "fulfilled" ? mergeUserStatus(users[index], result.value, "banned") : null,
                )
                .filter(Boolean);
            const failedCount = results.length - updatedUsers.length;

            if (updatedUsers.length) {
                patchUsers(updatedUsers);
                setSelectedUserIds((current) =>
                    current.filter((userId) => !updatedUsers.some((updatedUser) => updatedUser.userId === userId)),
                );
            }

            if (failedCount > 0) {
                showToast(
                    updatedUsers.length ? `已封禁 ${updatedUsers.length} 个，${failedCount} 个失败` : "批量封禁失败",
                    updatedUsers.length ? "warning" : "error",
                );
                return;
            }

            showToast(`已封禁 ${updatedUsers.length} 个用户`, "success");
        } finally {
            setLoadingAction("");
        }
    };

    const runAction = async (action, successMessage, submitter) => {
        setLoadingAction(action);
        try {
            await submitter();
            showToast(successMessage, "success");
        } catch (err) {
            showToast(err.message || "操作失败", "error");
        } finally {
            setLoadingAction("");
        }
    };

    const patchUsers = (users) => {
        setPatchedUsers((current) => {
            const next = { ...current };
            users.forEach((user) => {
                if (!user?.userId) {
                    return;
                }
                next[user.userId] = { ...(next[user.userId] || {}), ...user };
            });
            return next;
        });
    };

    return {
        abilities,
        activeAction,
        activeUser,
        batchBan,
        changeUserFilter,
        changeStatus,
        closeAction,
        changeLocationFilter,
        countryForm,
        countryOptions,
        data,
        editForm,
        error,
        loading,
        loadingAction,
        loadingCountries,
        loadingRegions,
        locationFilterOptions,
        locationFilterValue,
        openCountry,
        openCoinLedger,
        openEdit,
        openPassword,
        page,
        passwordForm,
        regionId,
        regionOptions,
        reload,
        resetFilters,
        selectedUserIds,
        setCountryForm,
        setEditForm,
        setPage,
        setPasswordForm,
        setSelectedUserIds,
        sortBy,
        sortDirection,
        status,
        timeRange,
        userFilter,
        changeSort,
        changeTimeRange,
        submitCountry,
        submitEdit,
        submitPassword,
        toggleBan,
    };
}

function isBanned(user) {
    return user.status === "banned" || user.status === "disabled";
}

function mergeUserStatus(currentUser, result, fallbackStatus) {
    return {
        ...currentUser,
        ...(result || {}),
        status: result?.status || fallbackStatus,
    };
}