import PenControlDrawService from './draw/penControlDrawService';
import {
    PEN_CONTROL_PATTERNS,
    pickRandomPatternIds,
} from './data/penControlPatterns';
import {
    DEFAULT_PATTERN_COUNT,
    generatePenControlMix,
    MAX_PATTERNS,
} from './generators/penControlGenerator';
import {
    getModeInfo,
    getPublishMetaByMode,
    isValidMode,
    PEN_CONTROL_WORKSHEET_ID,
} from './penControlSheet.config';
import { createPage, type CanvasDataState } from '../../base/pageMixin';
import { defaultShareConfig } from '../../config/config';
import type { DebugPublishMeta } from '../../utils/debugPublish';
import {
    addFavorite,
    removeFavorite,
    batchCheckFavorited,
} from '../../utils/favorites';

const pageInfoLookup = getModeInfo;

function pickRandomPatternSet(count: number, current: string[]): string[] {
    const next = pickRandomPatternIds(count, current);
    if (next.length >= count) return next.slice(0, count);
    return pickRandomPatternIds(count);
}

function buildSelectedMap(ids: string[]): Record<string, boolean> {
    const map: Record<string, boolean> = {};
    for (const id of ids) map[id] = true;
    return map;
}

type PageData = CanvasDataState & {
    worksheetId: string;
    selectedPatternIds: string[];
    selectedMap: Record<string, boolean>;
    patternList: typeof PEN_CONTROL_PATTERNS;
    isPreviewFavorite: boolean;
    isDevEnv: boolean;
    debugPublishVisible: boolean;
    debugPublishLoading: boolean;
    debugPublishMeta: DebugPublishMeta | null;
};

createPage(
    {
        canvas: null as Canvas | null,
        ctx: null as RenderingContext | null,
        boxHeight: 0,
        boxWidth: 0,
        drawService: null as PenControlDrawService | null,
        _favoritedMap: {} as Record<string, boolean>,

        data: {
            pageTitle: '控笔组合练习',
            functionId: PEN_CONTROL_WORKSHEET_ID,
            hasContent: false,
            showShareDialog: false,
            worksheetId: PEN_CONTROL_WORKSHEET_ID,
            selectedPatternIds: [] as string[],
            selectedMap: {} as Record<string, boolean>,
            patternList: PEN_CONTROL_PATTERNS,
            isPreviewFavorite: false,
            isDevEnv: false,
            debugPublishVisible: false,
            debugPublishLoading: false,
            debugPublishMeta: null,
        } as unknown as PageData,

        onLoad(options: { id?: string }) {
            this.syncDebugPublishEnv();
            console.log('PEN_CONTROL_PATTERNS', PEN_CONTROL_PATTERNS);
            const worksheetId =
                options.id && isValidMode(options.id)
                    ? options.id
                    : PEN_CONTROL_WORKSHEET_ID;

            const initialPatterns = PEN_CONTROL_PATTERNS.slice(
                0,
                DEFAULT_PATTERN_COUNT,
            ).map((p) => p.id);

            console.log('initialPatterns', initialPatterns);

            this.setData({
                worksheetId,
                functionId: worksheetId,
                selectedPatternIds: initialPatterns,
                selectedMap: buildSelectedMap(initialPatterns),
            });

            this.initPageInfo(worksheetId, '控笔练习');
            this.loadFavoritedMap();
        },

        onCanvasReady(e: WechatMiniprogram.CustomEvent) {
            this.initCanvasFromComponent(e.detail, {
                createDrawService: (
                    canvas: Canvas,
                    ctx: RenderingContext,
                    opts?: Record<string, unknown>,
                ) => new PenControlDrawService(canvas, ctx, opts),
                drawServiceOptions: {
                    title: this.data.pageTitle,
                },
                onCanvasReady: () => {
                    this.drawCanvas();
                },
            });
        },

        async drawCanvas() {
            if (!this.drawService) return;

            try {
                const layout = (
                    this.drawService as PenControlDrawService
                ).buildLayoutForGenerate();
                const data = generatePenControlMix({
                    patternIds: this.data.selectedPatternIds,
                    patternCount: this.data.selectedPatternIds.length,
                    layout,
                });

                const ids = data.blocks.map((b) => b.patternId);
                if (ids.join(',') !== this.data.selectedPatternIds.join(',')) {
                    this.setData({
                        selectedPatternIds: ids,
                        selectedMap: buildSelectedMap(ids),
                    });
                }

                await (this.drawService as PenControlDrawService).draw(data);
                this.setData({ hasContent: true });
            } catch (e) {
                console.error('penControlSheet draw failed', e);
                this.setData({ hasContent: false });
            }
        },

        onTogglePattern(e: WechatMiniprogram.TouchEvent) {
            const id = e.currentTarget.dataset.id as string;
            if (!id) return;

            let ids = [...this.data.selectedPatternIds];
            const idx = ids.indexOf(id);

            if (idx >= 0) {
                ids.splice(idx, 1);
            } else {
                if (ids.length >= MAX_PATTERNS) {
                    wx.showToast({
                        title: `最多选择 ${MAX_PATTERNS} 个`,
                        icon: 'none',
                    });
                    return;
                }
                ids.push(id);
            }

            this.setData(
                {
                    selectedPatternIds: ids,
                    selectedMap: buildSelectedMap(ids),
                },
                () => this.drawCanvas(),
            );
        },

        onPreviewRefresh() {
            const count =
                this.data.selectedPatternIds.length || DEFAULT_PATTERN_COUNT;
            const next = pickRandomPatternSet(
                count,
                this.data.selectedPatternIds,
            );
            this.setData(
                {
                    selectedPatternIds: next,
                    selectedMap: buildSelectedMap(next),
                },
                () => this.drawCanvas(),
            );
        },

        onShufflePatterns() {
            this.onPreviewRefresh();
        },

        async onPreviewFavorite() {
            const next = !this.data.isPreviewFavorite;
            this.setData({ isPreviewFavorite: next });
            const id = this.data.worksheetId;
            if (id) {
                this._favoritedMap[id] = next;
                if (next) {
                    addFavorite(id);
                } else {
                    removeFavorite(id);
                }
            }
            wx.showToast({
                title: next ? '收藏成功' : '已取消收藏',
                icon: 'none',
            });
        },

        async loadFavoritedMap() {
            const ids = [PEN_CONTROL_WORKSHEET_ID];
            this._favoritedMap = await batchCheckFavorited(ids);
            if (this._favoritedMap[this.data.worksheetId]) {
                this.setData({ isPreviewFavorite: true });
            }
        },

        getPublishMeta(): DebugPublishMeta {
            const meta = getPublishMetaByMode(this.data.worksheetId);
            if (!meta) {
                throw new Error('当前题型配置不存在');
            }
            return meta;
        },
    },
    {
        shareConfig: defaultShareConfig,
        pageInfoLookup,
    },
);