import { MOCK_SEED_COUNTS } from './mockLikes';
import {
    MATH_WORKSHEET_DEFINITIONS,
    CLOCK_CONNECT_WORKSHEET_DEFINITIONS,
    FOCUS_WORKSHEET_DEFINITIONS,
    LETTER_TRACING_WORKSHEET_DEFINITIONS,
    PINYIN_DICTATION_WORKSHEET_DEFINITIONS,
    PEN_CONTROL_WORKSHEET_DEFINITIONS,
    WORD_COLORING_WORKSHEET_DEFINITIONS,
    type WorksheetDefinition,
} from '../../config/worksheets';

type CloudFunctionResult<T> = {
    success?: boolean;
    message?: string;
    data?: T;
    dryRun?: boolean;
    total?: number;
    failed?: number;
    results?: Array<{ id: string | null; ok: boolean; error?: string }>;
};

async function callCloudFunction<T>(
    name: string,
    data?: Record<string, unknown>,
): Promise<CloudFunctionResult<T>> {
    const response = (await wx.cloud.callFunction({
        name,
        data: data || {},
    })) as { result?: CloudFunctionResult<T> };
    return response.result || {};
}

function inferGradeFromAge(ageMin: number, ageMax: number): number {
    const centerAge = Math.round((ageMin + ageMax) / 2);
    const ageGradeMap: Record<number, number> = {
        2: -4,
        3: -3,
        4: -2,
        5: -1,
        6: 0,
        7: 1,
        8: 2,
        9: 3,
        10: 4,
        11: 5,
        12: 6,
    };

    return ageGradeMap[centerAge] ?? 0;
}

type ConfigSource = {
    label: string;
    data: ReadonlyArray<WorksheetDefinition>;
};

const CONFIG_SOURCES: ConfigSource[] = [
    {
        label: 'math',
        data: MATH_WORKSHEET_DEFINITIONS,
    },
    {
        label: 'focus',
        data: FOCUS_WORKSHEET_DEFINITIONS,
    },
    {
        label: 'letterTracing',
        data: LETTER_TRACING_WORKSHEET_DEFINITIONS,
    },
    {
        label: 'pinyin',
        data: PINYIN_DICTATION_WORKSHEET_DEFINITIONS,
    },
    {
        label: 'penControl',
        data: PEN_CONTROL_WORKSHEET_DEFINITIONS,
    },
    {
        label: 'wordColoring',
        data: WORD_COLORING_WORKSHEET_DEFINITIONS,
    },
    {
        label: 'clockConnect',
        data: CLOCK_CONNECT_WORKSHEET_DEFINITIONS,
    },
];

function isWorksheetDefinition(value: unknown): value is WorksheetDefinition {
    const row = value as Partial<WorksheetDefinition>;
    return (
        !!row &&
        typeof row.id === 'string' &&
        typeof row.ageMin === 'number' &&
        typeof row.ageMax === 'number' &&
        Array.isArray(row.tags)
    );
}

async function loadConfigSource(
    source: ConfigSource,
): Promise<WorksheetDefinition[]> {
    const rows = source.data;

    if (!Array.isArray(rows) || !rows.every(isWorksheetDefinition)) {
        throw new Error(`${source.label} 配置格式不正确`);
    }

    return [...rows];
}

async function collectAll(): Promise<WorksheetDefinition[]> {
    const groups = await Promise.all(CONFIG_SOURCES.map(loadConfigSource));
    return groups.flat();
}

function assertUniqueIds(rows: WorksheetDefinition[]) {
    const set = new Set<string>();
    for (const r of rows) {
        if (set.has(r.id)) {
            throw new Error(`本地配置存在重复 id：${r.id}`);
        }
        set.add(r.id);
    }
}

function summarizeResult(
    title: string,
    result: CloudFunctionResult<unknown>,
): string {
    if (!result.success) {
        return `${title}失败：${result.message || '未知错误'}`;
    }
    const total = result.total ?? 0;
    const failed = result.failed ?? 0;
    const ok = total - failed;
    const firstError = result.results?.find((r) => !r.ok)?.error;
    return `${title}完成：成功 ${ok}/${total}${
        failed ? `，失败 ${failed}（如：${firstError || '未知原因'}）` : ''
    }`;
}

Page({
    data: {
        configLoading: true,
        configReady: false,
        configError: '',
        configTotal: 0,
        configSourceCount: CONFIG_SOURCES.length,
        loadingAges: false,
        loadingTags: false,
        loadingRebuild: false,
        loadingSeed: false,
        loadingResetStats: false,
        statusText: '配置加载中，请稍候',
    },

    onLoad() {
        void this.loadConfigs();
    },

    async onPullDownRefresh() {
        await this.loadConfigs();
        wx.stopPullDownRefresh();
    },

    async loadConfigs() {
        this.setData({
            configLoading: true,
            configReady: false,
            configError: '',
            statusText: '配置加载中，请稍候',
        });

        try {
            const rows = await collectAll();
            assertUniqueIds(rows);
            this.setData({
                configLoading: false,
                configReady: true,
                configTotal: rows.length,
                statusText: `配置已加载：${rows.length} 个 worksheet，可执行同步`,
            });
        } catch (error) {
            const msg = error instanceof Error ? error.message : '配置加载失败';
            this.setData({
                configLoading: false,
                configReady: false,
                configError: msg,
                statusText: msg,
            });
            wx.showToast({ title: msg, icon: 'none' });
        }
    },

    async sync(mode: 'ages' | 'tags') {
        if (!this.data.configReady) {
            wx.showToast({ title: '配置未加载完成', icon: 'none' });
            return;
        }

        const rows = await collectAll();
        assertUniqueIds(rows);

        const patches =
            mode === 'ages'
                ? rows.map((r) => ({
                      id: r.id,
                      ageMin: r.ageMin,
                      ageMax: r.ageMax,
                      grade: inferGradeFromAge(r.ageMin, r.ageMax),
                  }))
                : rows.map((r) => ({
                      id: r.id,
                      tags: [...r.tags],
                  }));

        wx.showLoading({ title: '同步中...' });
        const startedAt = Date.now();

        try {
            const patchRes = await callCloudFunction('worksheetsBatchPatch', {
                patches,
                dryRun: false,
            });

            if (!patchRes.success) {
                throw new Error(patchRes.message || '同步失败');
            }

            const elapsed = Math.round((Date.now() - startedAt) / 1000);

            const text = [
                summarizeResult(
                    mode === 'ages'
                        ? '同步年龄（worksheetsBatchPatch）'
                        : '同步标签（worksheetsBatchPatch）',
                    patchRes,
                ),
                'page-config 未自动重建，如需刷新前台展示请点击“重建配置”。',
                `耗时：${elapsed}s`,
            ].join('\n');

            this.setData({ statusText: text });
            wx.showToast({ title: '已完成', icon: 'success' });
        } catch (error) {
            const msg = error instanceof Error ? error.message : '同步失败';
            this.setData({ statusText: msg });
            wx.showToast({ title: msg, icon: 'none' });
        } finally {
            wx.hideLoading();
        }
    },

    async rebuildPageConfig() {
        wx.showLoading({ title: '重建中...' });
        const startedAt = Date.now();

        try {
            const rebuildRes = await callCloudFunction('pageContentBuild', {
                page: 'all',
            });
            const elapsed = Math.round((Date.now() - startedAt) / 1000);

            const text = [
                summarizeResult(
                    '重建 page-config（pageContentBuild: all）',
                    rebuildRes,
                ),
                `耗时：${elapsed}s`,
            ].join('\n');

            this.setData({ statusText: text });
            if (!rebuildRes.success) {
                throw new Error(rebuildRes.message || '重建失败');
            }
            wx.showToast({ title: '已重建', icon: 'success' });
        } catch (error) {
            const msg = error instanceof Error ? error.message : '重建失败';
            this.setData({ statusText: msg });
            wx.showToast({ title: msg, icon: 'none' });
        } finally {
            wx.hideLoading();
        }
    },

    async onSyncAges() {
        if (
            !this.data.configReady ||
            this.data.loadingAges ||
            this.data.loadingTags ||
            this.data.loadingRebuild
        )
            return;
        this.setData({ loadingAges: true });
        try {
            await this.sync('ages');
        } finally {
            this.setData({ loadingAges: false });
        }
    },

    async onSyncTags() {
        if (
            !this.data.configReady ||
            this.data.loadingAges ||
            this.data.loadingTags ||
            this.data.loadingRebuild
        )
            return;
        this.setData({ loadingTags: true });
        try {
            await this.sync('tags');
        } finally {
            this.setData({ loadingTags: false });
        }
    },

    async onRebuildConfig() {
        if (
            this.data.loadingAges ||
            this.data.loadingTags ||
            this.data.loadingRebuild
        )
            return;
        this.setData({ loadingRebuild: true });
        try {
            await this.rebuildPageConfig();
        } finally {
            this.setData({ loadingRebuild: false });
        }
    },

    async onSyncSeed() {
        if (
            this.data.loadingAges ||
            this.data.loadingTags ||
            this.data.loadingRebuild ||
            this.data.loadingSeed
        )
            return;

        this.setData({ loadingSeed: true });
        wx.showLoading({ title: '同步 Seed...' });
        const startedAt = Date.now();

        try {
            const patches = Object.entries(MOCK_SEED_COUNTS).map(
                ([id, counts]) => ({
                    id,
                    likes_seed: counts.likes,
                    downloads_seed: counts.downloads,
                }),
            );

            const patchRes = await callCloudFunction('worksheetsBatchPatch', {
                patches,
                dryRun: false,
            });

            if (!patchRes.success) {
                throw new Error(patchRes.message || '同步 Seed 失败');
            }

            const elapsed = Math.round((Date.now() - startedAt) / 1000);

            const text = [
                summarizeResult(
                    '同步 Seed（likes_seed / downloads_seed）',
                    patchRes,
                ),
                `共 ${patches.length} 条 Seed 数据`,
                `耗时：${elapsed}s`,
            ].join('\n');

            this.setData({ statusText: text });
            wx.showToast({ title: '已完成', icon: 'success' });
        } catch (error) {
            const msg =
                error instanceof Error ? error.message : '同步 Seed 失败';
            this.setData({ statusText: msg });
            wx.showToast({ title: msg, icon: 'none' });
        } finally {
            wx.hideLoading();
            this.setData({ loadingSeed: false });
        }
    },

    async onResetStats() {
        if (
            this.data.loadingAges ||
            this.data.loadingTags ||
            this.data.loadingRebuild ||
            this.data.loadingSeed ||
            this.data.loadingResetStats
        )
            return;

        const { confirm } = await wx.showModal({
            title: '确认初始化',
            content:
                '将所有 worksheet 的 likes 和 downloads 重置为 0，此操作不可撤销。确定继续？',
            confirmText: '确定重置',
            confirmColor: '#e53935',
        });
        if (!confirm) return;

        this.setData({ loadingResetStats: true });
        wx.showLoading({ title: '重置中...' });
        const startedAt = Date.now();

        try {
            const queryRes = await callCloudFunction<Array<{ _id: string }>>(
                'worksheetsQuery',
                {},
            );

            if (!queryRes.success || !queryRes.data) {
                throw new Error(queryRes.message || '查询 worksheet 列表失败');
            }

            const patches = (queryRes.data as Array<{ _id: string }>).map(
                (ws) => ({
                    id: ws._id,
                    likes: 0,
                    downloads: 0,
                }),
            );

            if (patches.length === 0) {
                this.setData({ statusText: '没有需要重置的 worksheet' });
                wx.showToast({ title: '无数据', icon: 'none' });
                return;
            }

            const patchRes = await callCloudFunction('worksheetsBatchPatch', {
                patches,
                dryRun: false,
            });

            if (!patchRes.success) {
                throw new Error(patchRes.message || '重置失败');
            }

            const elapsed = Math.round((Date.now() - startedAt) / 1000);

            const text = [
                summarizeResult(
                    '初始化收藏和下载数据（likes / downloads → 0）',
                    patchRes,
                ),
                `共 ${patches.length} 条 worksheet`,
                `耗时：${elapsed}s`,
            ].join('\n');

            this.setData({ statusText: text });
            wx.showToast({ title: '已重置', icon: 'success' });
        } catch (error) {
            const msg = error instanceof Error ? error.message : '重置失败';
            this.setData({ statusText: msg });
            wx.showToast({ title: msg, icon: 'none' });
        } finally {
            wx.hideLoading();
            this.setData({ loadingResetStats: false });
        }
    },
});