import WordDrawService from './draw/wordDrawService';
import WordDailyCheckinDraw, {
    DailyCheckinHanziItem,
} from './draw/wordDailyCheckinDraw';
import {
    getWordsSvgData,
    getHanziReadingsData,
    pickPrimaryPinyin,
    HanziReadingsMap,
} from '../shared/getWordsSvgJson';
import { WORDS, getCategoryTabIndex } from '../../core/data/words';
import { CharacterItem } from '../../types/characterType';
import { createPage } from '../../base/pageMixin';
import { defaultShareConfig } from '../../config/config';
import {
    addFavorite,
    removeFavorite,
    batchCheckFavorited,
} from '../../utils/favorites';
import type { DebugPublishMeta } from '../../utils/debugPublish';
import {
    HANDWRITING_SHEET_WORKSHEET_DEFINITIONS,
    HANDWRITING_SHEET_MODE_OPTIONS,
    HANDWRITING_SHEET_WORKSHEET_ID,
    HandwritingSheetMode,
    getModeInfo,
    getPublishMetaByMode,
    isValidMode,
} from './handwritingSheet.config';

const CUSTOM_MAX_WORDS = 11;
const CHECKIN_MAX_WORDS = 8;
const RANDOM_WORD_COUNT = 8;
const CUSTOM_DEFAULT_WORDS = '东西南北日月山河风雨';
/** 汉字每日打卡默认文案（8 字，与 CHECKIN_MAX_WORDS 一致） */
const CHECKIN_DEFAULT_WORDS = '日拱一卒不期而至';
const CUSTOM_CATEGORY_TAGS = WORDS.slice(0, 3).map((cat) => ({
    categoryId: cat.categoryId,
    icon: cat.icon,
    categoryName: cat.categoryName,
}));

function collectFirstGradeWords(): string[] {
    const grade = WORDS.find((cat) => cat.categoryId === 26);
    if (!grade || !grade.sections) return [];
    const merged: string[] = [];
    for (const section of grade.sections) {
        for (const w of section.words) merged.push(w);
    }
    return Array.from(new Set(merged));
}

createPage(
    {
        canvas: null as Canvas | null,
        ctx: null as RenderingContext | null,
        wordDrawService: null as WordDrawService | null,
        dailyDrawService: null as WordDailyCheckinDraw | null,
        svgWords: {} as Record<string, string[]>,
        readings: {} as HanziReadingsMap,
        readingsLoaded: false,
        maxRow: 0 as number,
        maxCol: 0 as number,
        _favoritedMap: {} as Record<string, boolean>,

        data: {
            pageTitle: HANDWRITING_SHEET_WORKSHEET_DEFINITIONS[0].title,
            functionId: HANDWRITING_SHEET_WORKSHEET_ID,
            currentMode: HANDWRITING_SHEET_WORKSHEET_ID as HandwritingSheetMode,
            modeOptions: HANDWRITING_SHEET_MODE_OPTIONS,
            hasContent: false,
            /** 练习字表（唯一数据源）；inputValue 与弹窗均为其编辑入口 */
            words: [] as string[],
            inputValue: '',
            showSelectWordPopup: false,
            pickerCurrentTab: 0,
            pickerMax: CUSTOM_MAX_WORDS,
            categoryTags: CUSTOM_CATEGORY_TAGS,
            showCustomPanel: true,
            showShareDialog: false,
            isPreviewFavorite: false,
            isDevEnv: false,
            debugPublishVisible: false,
            debugPublishLoading: false,
            debugPublishMeta: null as DebugPublishMeta | null,
        },

        async onLoad(options: { id?: string }) {
            this.syncDebugPublishEnv();
            this.loadFavoritedMap();

            const initialMode: HandwritingSheetMode =
                options.id && isValidMode(options.id)
                    ? (options.id as HandwritingSheetMode)
                    : HANDWRITING_SHEET_WORKSHEET_ID;

            this.applyMode(initialMode, { redraw: false });
            await this.loadSvgWords();
            this.initDefaultWords();
        },

        async loadSvgWords() {
            try {
                wx.showToast({ title: '加载字体中...', icon: 'loading' });
                this.svgWords = await getWordsSvgData();
                wx.hideToast();

                if (this.data.words.length > 0) {
                    this.renderPracticeContent().catch(console.error);
                }
            } catch (error) {
                console.error('加载SVG汉字数据失败:', error);
                wx.hideToast();
                wx.showModal({
                    title: '加载失败',
                    content: '无法加载汉字数据，请检查网络连接后重试',
                    showCancel: true,
                    cancelText: '取消',
                    confirmText: '重试',
                    success: (res) => {
                        if (res.confirm) {
                            this.loadSvgWords();
                        }
                    },
                });
            }
        },

        async ensureReadingsLoaded(): Promise<void> {
            if (this.readingsLoaded) return;
            try {
                this.readings = await getHanziReadingsData();
                this.readingsLoaded = true;
            } catch (error) {
                console.error('加载汉字读音数据失败:', error);
            }
        },

        async onCanvasReady(e: WechatMiniprogram.CustomEvent) {
            const { canvas, ctx } = e.detail;
            if (!canvas || !ctx) return;

            this.canvas = canvas;
            this.ctx = ctx;
            this.wordDrawService = new WordDrawService(canvas, ctx);
            this.dailyDrawService = new WordDailyCheckinDraw(canvas, ctx);

            await this.prepareCanvasForCurrentMode();

            if (this.data.words.length > 0) {
                await this.renderPracticeContent();
            }
        },

        async prepareCanvasForCurrentMode() {
            if (!this.canvas) return;
            if (this.data.currentMode === 'hanzi-sheet') {
                if (!this.wordDrawService) return;
                await this.wordDrawService.drawLayout();
                const { maxRow, maxCol } =
                    this.wordDrawService.getMaxGridLayout();
                this.maxRow = maxRow;
                this.maxCol = maxCol;
            } else {
                this.dailyDrawService?.prepareDraw();
            }
        },

        applyMode(mode: HandwritingSheetMode, options?: { redraw?: boolean }) {
            const isCheckin = mode === 'hanzi-daily-checkin';
            const max = isCheckin ? CHECKIN_MAX_WORDS : CUSTOM_MAX_WORDS;

            this.setData(
                {
                    currentMode: mode,
                    functionId: mode,
                    pickerMax: max,
                    showCustomPanel: true,
                },
                () => {
                    this.initPageInfo(mode);
                    if (options?.redraw) {
                        this.resetForModeChange();
                    }
                },
            );
        },

        async onSelectMode(e: WechatMiniprogram.TouchEvent) {
            const id = e.currentTarget.dataset.id as
                | HandwritingSheetMode
                | undefined;
            if (!id || id === this.data.currentMode) return;
            this.applyMode(id, { redraw: true });
        },

        async resetForModeChange() {
            await this.prepareCanvasForCurrentMode();

            // 切换模式后用对应模式的默认数据填充
            this.initDefaultWords();
        },

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

        async onPreviewFavorite() {
            const id = this.data.currentMode;
            const next = !this.data.isPreviewFavorite;
            this.setData({ isPreviewFavorite: next });
            this._favoritedMap[id] = next;

            if (next) {
                await addFavorite(id);
            } else {
                await removeFavorite(id);
            }

            wx.showToast({
                title: next ? '收藏成功' : '已取消收藏',
                icon: 'none',
            });
        },

        async loadFavoritedMap() {
            const ids = HANDWRITING_SHEET_WORKSHEET_DEFINITIONS.map(
                (d) => d.id,
            );
            this._favoritedMap = await batchCheckFavorited(ids);

            if (this._favoritedMap[this.data.currentMode]) {
                this.setData({ isPreviewFavorite: true });
            }
        },

        onInputChange(e: WechatMiniprogram.Input) {
            const value = e.detail.value as string;
            this.syncWordsFromInput(value, false);
        },

        onInputConfirm(e: WechatMiniprogram.Input) {
            const value = e.detail.value as string;
            this.syncWordsFromInput(value, true);
        },

        onClearInput() {
            this.clearWords();
        },

        getMaxWordsForMode(): number {
            return this.data.currentMode === 'hanzi-daily-checkin'
                ? CHECKIN_MAX_WORDS
                : CUSTOM_MAX_WORDS;
        },

        /** 以 words 为准，同步输入框镜像并刷新预览 */
        applyWords(nextWords: string[], options?: { closePicker?: boolean }) {
            const inputValue = nextWords.join('');
            const patch: Record<string, unknown> = {
                words: nextWords,
                inputValue,
            };
            if (options?.closePicker) {
                patch.showSelectWordPopup = false;
            }

            this.setData(patch, () =>
                this.renderPracticeContent().catch(console.error),
            );
        },

        syncWordsFromInput(value: string, showLimitToast: boolean) {
            const max = this.getMaxWordsForMode();
            const parsed = this.splitToSingleChars(value);
            const nextWords = parsed.slice(0, max);

            if (showLimitToast && parsed.length > max) {
                wx.showToast({
                    title: `最多输入 ${max} 个字`,
                    icon: 'none',
                });
            }

            this.applyWords(nextWords);
        },

        openSelectWordPopup() {
            this.setData({ showSelectWordPopup: true, pickerCurrentTab: 0 });
        },

        closeSelectWordPopup() {
            this.setData({ showSelectWordPopup: false });
        },

        onCategoryTap(e: WechatMiniprogram.TouchEvent) {
            const categoryId = Number(e.currentTarget.dataset.categoryId);
            this.setData({
                showSelectWordPopup: true,
                pickerCurrentTab: getCategoryTabIndex(categoryId),
            });
        },

        onChangeWord(e: WechatMiniprogram.CustomEvent) {
            const max = this.getMaxWordsForMode();
            const nextWords = e.detail.selectedWords as string[];

            if (nextWords.length > max) {
                wx.showToast({
                    title: `最多只能添加 ${max} 个字`,
                    icon: 'none',
                });
                return;
            }

            this.applyWords(nextWords, { closePicker: true });
        },

        deleteWordChip(e: WechatMiniprogram.TouchEvent) {
            const index = Number(e.currentTarget.dataset.index);
            if (Number.isNaN(index)) return;

            const words = [...(this.data.words as string[])];
            if (index < 0 || index >= words.length) return;

            words.splice(index, 1);
            this.applyWords(words);
        },

        clearWords() {
            this.applyWords([], { closePicker: true });
        },

        initDefaultWords() {
            if (this.data.currentMode === 'hanzi-daily-checkin') {
                const defaults = this.getSupportedWords(
                    this.splitToSingleChars(CHECKIN_DEFAULT_WORDS),
                ).slice(0, CHECKIN_MAX_WORDS);

                if (defaults.length === 0) {
                    this.refreshWords();
                    return;
                }

                this.applyWords(defaults);
                return;
            }

            const defaults = this.getSupportedWords(
                this.splitToSingleChars(CUSTOM_DEFAULT_WORDS),
            ).slice(0, CUSTOM_MAX_WORDS);

            if (defaults.length === 0) {
                this.refreshWords();
                return;
            }

            this.applyWords(defaults);
        },

        refreshWords() {
            const isCheckin = this.data.currentMode === 'hanzi-daily-checkin';
            const candidates = isCheckin
                ? collectFirstGradeWords()
                : WORDS.slice(0, 3).reduce(
                      (acc: string[], category) =>
                          acc.concat(category.words || []),
                      [] as string[],
                  );

            const shuffled = Array.from(new Set(candidates)).sort(
                () => Math.random() - 0.5,
            );
            const limit = isCheckin ? CHECKIN_MAX_WORDS : RANDOM_WORD_COUNT;
            const supported = this.getSupportedWords(shuffled).slice(0, limit);

            if (supported.length === 0) {
                wx.showToast({
                    title: '随机到的字暂不支持，重试一下',
                    icon: 'none',
                });
                return;
            }

            this.applyWords(supported);
        },

        splitToSingleChars(text: string): string[] {
            const matches = text.match(/[\u4e00-\u9fff]/g);
            return matches || [];
        },

        async renderPracticeContent() {
            if (!this.canvas) return;

            const words = this.data.words as string[];

            if (this.data.currentMode === 'hanzi-daily-checkin') {
                await this.renderCheckinContent(words);
                return;
            }

            await this.renderCustomContent(words);
        },

        async renderCustomContent(words: string[]) {
            if (!this.wordDrawService) return;

            if (words.length === 0) {
                await this.wordDrawService.drawContentEmpty();
                this.setData({ hasContent: false });
                return;
            }

            const supportedWords = this.getSupportedWords(words);
            if (supportedWords.length === 0) {
                wx.showToast({ title: '暂不支持这些汉字', icon: 'none' });
                await this.wordDrawService.drawContentEmpty();
                this.setData({ hasContent: false });
                return;
            }

            let maxRow = this.maxRow;
            let maxCol = this.maxCol;
            if (!maxRow || !maxCol) {
                const layout = this.wordDrawService.getMaxGridLayout();
                this.maxRow = layout.maxRow;
                this.maxCol = layout.maxCol;
                maxRow = layout.maxRow;
                maxCol = layout.maxCol;
            }

            const characterData = this.processCharacterLayout(
                supportedWords,
                maxRow,
                maxCol,
            );

            await this.wordDrawService.drawPracticeContent(characterData);
            this.setData({ hasContent: characterData.length > 0 });
        },

        async renderCheckinContent(words: string[]) {
            if (!this.dailyDrawService) return;

            const supportedWords = this.getSupportedWords(words).slice(
                0,
                CHECKIN_MAX_WORDS,
            );

            if (supportedWords.length === 0) {
                this.dailyDrawService.prepareDraw();
                this.setData({ hasContent: false });
                return;
            }

            await this.ensureReadingsLoaded();

            const items: DailyCheckinHanziItem[] = supportedWords.map(
                (char: string) => ({
                    character: char,
                    pinyin: pickPrimaryPinyin(this.readings, char),
                    strokes: this.svgWords[char] || [],
                }),
            );

            await this.dailyDrawService.draw(items);
            this.setData({ hasContent: items.length > 0 });
        },

        getSupportedWords(words: string[]): string[] {
            return words.filter((word) => this.svgWords[word]);
        },

        processCharacterLayout(
            words: string[],
            maxRow: number,
            maxCol: number,
        ): CharacterItem[] {
            let rowIndex = 0;
            const characterData: CharacterItem[] = [];

            words.forEach((word: string) => {
                const strokes = this.svgWords[word];
                const strokeCount = strokes.length;
                const totalCells = 1 + strokeCount;
                const totalRows = Math.ceil(totalCells / maxCol);
                rowIndex += totalRows;

                if (rowIndex <= maxRow) {
                    characterData.push({ character: word, strokes });
                }
            });

            return characterData;
        },

        onShare() {},

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