import type { LetterTracingMode } from './generators/letter-tracing-generator';
import type { DebugPublishMeta } from '../../utils/debugPublish';
import { inferGradeFromAge } from '../../utils/debugPublish';

interface ModeDefinition {
    id: LetterTracingMode;
    icon: string;
    title: string;
    subtitle: string;
    difficulty: 1 | 2 | 3 | 4;
    tags: string[];
    sortOrder: number;
}

const MODES = [
    {
        id: 'letter-tracing-single',
        icon: 'start-a',
        title: '默认字帖',
        subtitle: '配图、例句与描红',
        difficulty: 1,
        tags: ['字母描红', '英语启蒙', '看图描红'],
        sortOrder: 42,
    },
    {
        id: 'letter-tracing-upper-lower',
        icon: 'draw-o',
        title: '基础描红',
        subtitle: 'Uppercase / Lowercase 总览',
        difficulty: 1,
        tags: ['字母描红', '英语启蒙', '字母总览'],
        sortOrder: 44,
    },
    {
        id: 'letter-tracing-case-pairing',
        icon: 'font-size',
        title: '大小写对照',
        subtitle: '半组字母左大写右小写',
        difficulty: 1,
        tags: ['字母描红', '英语启蒙', '大小写练习'],
        sortOrder: 45,
    },
    {
        id: 'letter-tracing-two-column',
        icon: 'two-columns',
        title: '两列描红',
        subtitle: '左 A–M、右 N–Z 配对描红',
        difficulty: 1,
        tags: ['字母描红', '英语启蒙', '两列练习'],
        sortOrder: 43,
    },
    {
        id: 'letter-tracing-half',
        icon: 'square-half',
        title: '13字母半表',
        subtitle: '每行一个字母，13 字母半表',
        difficulty: 2,
        tags: ['字母描红', '英语启蒙', '单字母逐行'],
        sortOrder: 47,
    },
    {
        id: 'letter-tracing-three',
        icon: 'ABC-list',
        title: '三字母精练',
        subtitle: '每页聚焦 3 个字母深度书写',
        difficulty: 2,
        tags: ['字母描红', '英语启蒙', '三字母精练'],
        sortOrder: 46,
    },
    {
        id: 'letter-tracing-daily-checkin',
        icon: 'draw-o',
        title: '每日打卡',
        subtitle: '四宫格每日字母打卡练习',
        difficulty: 2,
        tags: ['字母描红', '英语启蒙', '每日打卡'],
        sortOrder: 48,
    },
] as const satisfies ReadonlyArray<ModeDefinition>;

type Mode = (typeof MODES)[number];

const MODE_BY_ID = Object.fromEntries(
    MODES.map((m) => [m.id, m]),
) as Record<string, Mode>;

/** 页面渲染用：模式选择器列表 */
export const LETTER_TRACING_MODE_OPTIONS = MODES;

/** 页面 pageInfoLookup 用 */
export function getModeInfo(id: string) {
    const m = MODE_BY_ID[id];
    return m ? { title: m.title, desc: m.subtitle } : undefined;
}

/** 判断 id 是否有效 */
export function isValidMode(id: string): boolean {
    return id in MODE_BY_ID;
}

/** 发布用：从当前 mode 生成 DebugPublishMeta */
export function getPublishMetaByMode(id: string): DebugPublishMeta | null {
    const m = MODE_BY_ID[id];
    if (!m) return null;
    return {
        id: m.id,
        title: m.title,
        subtitle: m.subtitle,
        category: 'english',
        subcategory: 'letter-tracing',
        path: `/englishPages/letterTracing/letterTracing?id=${m.id}`,
        ageMin: 4,
        ageMax: 7,
        grade: inferGradeFromAge(4, 7),
        difficulty: m.difficulty,
        previewImg: '',
        tags: [...m.tags],
        isNew: false,
        isHot: false,
        sortOrder: m.sortOrder,
        status: 'draft',
    };
}