import { reactive } from 'vue';
import { EmitableEvent, EventEmitter } from '../common/eventEmitter';
import { loading } from '../loader/load';
import { hook } from './game';
import { GameStorage } from './storage';
import { triggerFullscreen } from '@/plugin/utils';

type MotaSettingType = boolean | number | MotaSetting;

export interface MotaSettingItem<T extends MotaSettingType = MotaSettingType> {
    name: string;
    key: string;
    value: T;
    defaults?: boolean | number;
    step?: [number, number, number];
    display?: (value: T) => string;
    special?: string;
}

interface SettingEvent extends EmitableEvent {
    valueChange: <T extends boolean | number>(
        key: string,
        newValue: T,
        oldValue: T
    ) => void;
}

export type SettingText = {
    [key: string]: string[] | SettingText;
};

export interface SettingDisplayInfo {
    item: MotaSettingItem | null;
    list: Record<string, MotaSettingItem>;
    text: string[];
}

export class MotaSetting extends EventEmitter<SettingEvent> {
    readonly list: Record<string, MotaSettingItem> = {};

    /**
     * 重设设置
     * @param setting 设置信息
     */
    reset(setting: Record<string, boolean | number>) {
        for (const [key, value] of Object.entries(setting)) {
            this.setValue(key, value);
        }
    }

    /**
     * 标记为特殊的设置项
     */
    markSpecial(key: string, sp: string) {
        const setting = this.getSettingBy(key.split('.'));
        setting.special = sp;
        return this;
    }

    /**
     * 注册一个数字型设置
     * @param key 设置的键名
     * @param value 设置的值
     */
    register(
        key: string,
        name: string,
        value: number,
        step?: [number, number, number]
    ): this;
    /**
     * 注册一个非数字型设置
     * @param key 设置的键名
     * @param value 设置的值
     */
    register(key: string, name: string, value: boolean | MotaSetting): this;
    register(
        key: string,
        name: string,
        value: MotaSettingType,
        step: [number, number, number] = [0, 100, 1]
    ) {
        const setting: MotaSettingItem = {
            name,
            value,
            key
        };
        if (!(value instanceof MotaSetting)) setting.defaults = value;
        if (typeof value === 'number') setting.step = step;
        this.list[key] = setting;
        return this;
    }

    /**
     * 获取一个设置信息
     * @param key 要获取的设置的键
     */
    getSetting(key: string): Readonly<MotaSettingItem | null> {
        const list = key.split('.');
        return this.getSettingBy(list);
    }

    /**
     * 设置一个设置的值
     * @param key 要设置的设置的键
     * @param value 要设置的值
     */
    setValue(key: string, value: boolean | number) {
        const setting = this.getSettingBy(key.split('.'));
        if (typeof setting.value !== typeof value) {
            throw new Error(
                `Setting type mismatch on setting '${key}'.` +
                    `Expected: ${typeof setting.value}. Recieve: ${typeof value}`
            );
        }
        const old = setting.value as boolean | number;
        setting.value = value;
        this.emit('valueChange', key, value, old);
    }

    /**
     * 增加一个设置的值
     * @param key 要改变的设置的值
     * @param value 值的增量
     */
    addValue(key: string, value: number) {
        const setting = this.getSettingBy(key.split('.'));
        if (typeof setting.value !== 'number') {
            throw new Error(
                `Cannot execute addValue method on a non-number setting.` +
                    `Type expected: number. See: ${typeof setting.value}`
            );
        }
        const old = setting.value as boolean | number;
        setting.value += value;
        this.emit('valueChange', key, old, value);
    }

    /**
     * 设置一个设置的值显示函数
     * @param key 要设置的设置的键
     * @param func 显示函数
     */
    setDisplayFunc(key: string, func: (value: MotaSettingType) => string) {
        const setting = this.getSettingBy(key.split('.'));
        setting.display = func;
        return this;
    }

    private getSettingBy(list: string[]) {
        let now: MotaSetting = this;

        for (let i = 0; i < list.length - 1; i++) {
            const item = now.list[list[i]].value;
            if (!(item instanceof MotaSetting)) {
                throw new Error(
                    `Cannot get setting. The parent isn't a MotaSetting instance.` +
                        `Key: '${list.join('.')}'. Reading: '${list[i]}'`
                );
            }
            now = item;
        }

        return now.list[list.at(-1)!] ?? null;
    }
}

interface SettingDisplayerEvent extends EmitableEvent {
    update: (stack: string[], display: SettingDisplayInfo[]) => void;
}

export class SettingDisplayer extends EventEmitter<SettingDisplayerEvent> {
    setting: MotaSetting;
    textInfo: SettingText;
    /** 选项选中栈 */
    selectStack: string[] = [];
    displayInfo: SettingDisplayInfo[] = reactive([]);

    constructor(setting: MotaSetting, textInfo: SettingText) {
        super();
        this.setting = setting;
        this.textInfo = textInfo;
        this.update();
    }

    /**
     * 添加选择项
     * @param key 下一个选择项
     */
    add(key: string) {
        this.selectStack.push(...key.split('.'));
        this.update();
    }

    /**
     * 剪切后面的选择项
     * @param index 从哪开始剪切
     */
    cut(index: number, noUpdate: boolean = false) {
        this.selectStack.splice(index, Infinity);
        if (!noUpdate) this.update();
    }

    update() {
        const list = this.selectStack;
        let now = this.setting;
        let nowText: string[] | SettingText = this.textInfo;
        this.displayInfo = [];

        for (let i = 0; i < list.length - 1; i++) {
            const item = now.list[list[i]].value;
            if (!(item instanceof MotaSetting)) {
                throw new Error(
                    `Cannot get setting. The parent isn't a MotaSetting instance.` +
                        `Key: '${list.join('.')}'. Reading: '${list[i + 1]}'`
                );
            }

            this.displayInfo.push({
                item: now.list[list[i]],
                text: [],
                list: now.list
            });

            now = item;
            if (nowText && !(nowText instanceof Array))
                nowText = nowText[list[i]];
        }
        if (nowText && !(nowText instanceof Array))
            nowText = nowText[list.at(-1)!];

        const last = now.list[list.at(-1)!];
        if (last) {
            this.displayInfo.push({
                item: last,
                text: nowText instanceof Array ? nowText : ['请选择设置'],
                list: now.list
            });
            if (last.value instanceof MotaSetting) {
                this.displayInfo.push({
                    item: null,
                    text: ['请选择设置'],
                    list: (last.value as MotaSetting).list
                });
            }
        } else {
            this.displayInfo.push({
                item: null,
                text: ['请选择设置'],
                list: this.setting.list
            });
        }
        this.emit('update', this.selectStack, this.displayInfo);
    }
}

export const mainSetting = new MotaSetting();

// ----- 监听设置修改
mainSetting.on('valueChange', (key, n, o) => {
    const [root, setting] = key.split('.');
    if (root === 'screen') {
        handleScreenSetting(setting, n, o);
    } else if (root === 'action') {
        handleActionSetting(setting, n, o);
    } else if (root === 'utils') {
        handleUtilsSetting(setting, n, o);
    }
});

const root = document.getElementById('root') as HTMLDivElement;
const root2 = document.getElementById('root2') as HTMLDivElement;

function handleScreenSetting<T extends number | boolean>(
    key: string,
    n: T,
    o: T
) {
    if (key === 'fullscreen') {
        // 全屏
        triggerFullscreen(n as boolean);
    } else if (key === 'halo') {
        // 光环
        core.setLocalStorage('showHalo', n);
    } else if (key === 'frag') {
        // 打怪特效
        core.setLocalStorage('frag', n);
    } else if (key === 'itemDetail') {
        // 宝石血瓶显伤
        core.setLocalStorage('itemDetail', n);
    } else if (key === 'heroDetail') {
        // 勇士显伤
        core.setLocalStorage('heroDetail', n);
        core.drawHero();
        // storage.setValue('heroDetail', n as boolean);
    } else if (key === 'transition') {
        // 界面动画
        core.setLocalStorage('transition', n);
        // transition.value = n as boolean;
    } else if (key === 'antiAlias') {
        // 抗锯齿
        core.setLocalStorage('antiAlias', n);
        for (const canvas of core.dom.gameCanvas) {
            if (core.domStyle.hdCanvas.includes(canvas.id)) continue;
            if (n) {
                canvas.classList.remove('no-anti-aliasing');
            } else {
                canvas.classList.add('no-anti-aliasing');
            }
        }
    } else if (key === 'fontSize') {
        // 字体大小
        core.setLocalStorage('fontSize', n);
        root.style.fontSize = root2.style.fontSize = `${n}px`;
    } else if (key === 'smoothView') {
        core.setLocalStorage('smoothView', n);
    } else if (key === 'criticalGem') {
        core.setLocalStorage('criticalGem', n);
    }
}

function handleActionSetting<T extends number | boolean>(
    key: string,
    n: T,
    o: T
) {
    if (key === 'autoSkill') {
        // 自动切换技能
        flags.autoSkill = n;
    } else if (key === 'fixed') {
        // 定点查看
        core.setLocalStorage('fixed', n);
    }
}

function handleUtilsSetting<T extends number | boolean>(
    key: string,
    n: T,
    o: T
) {
    if (key === 'betterLoad') {
        // 加载优化
        core.setLocalStorage('betterLoad', n);
    } else if (key === 'autoScale') {
        // 自动放缩
        core.setLocalStorage('autoScale', n);
    }
}

// ----- 游戏的所有设置项
mainSetting
    .register(
        'screen',
        '显示设置',
        new MotaSetting()
            .register('fullscreen', '全屏游戏', false)
            .register('halo', '光环显示', true)
            .register('itemDetail', '宝石血瓶显伤', true)
            .register('heroDetail', '勇士显伤', false)
            .register('transition', '界面动画', false)
            .register('antiAlias', '抗锯齿', false)
            .register('fontSize', '字体大小', 16, [8, 28, 1])
            .register('smoothView', '平滑镜头', true)
            .register('criticalGem', '临界显示方式', false)
            .setDisplayFunc('criticalGem', value => (value ? '宝石数' : '攻击'))
    )
    .register(
        'action',
        '操作设置',
        new MotaSetting()
            .register('autoSkill', '自动切换技能', true)
            .register('fixed', '定点查看', true)
            .register('hotkey', '快捷键', false)
            .markSpecial('hotkey', 'hotkey')
            .setDisplayFunc('hotkey', () => '')
            .register('toolbar', '自定义工具栏', false)
            .markSpecial('toolbar', 'toolbar')
            .setDisplayFunc('toolbar', () => '')
    )
    .register(
        'utils',
        '系统设置',
        new MotaSetting()
            .register('betterLoad', '优化加载', true)
            .register('autoScale', '自动放缩', true)
    )
    .register(
        'fx',
        '特效设置',
        new MotaSetting()
            .register('paraLight', '野外阴影', true)
            .register('frag', '打怪特效', true)
    );

interface SettingStorage {
    showHalo: boolean;
    frag: boolean;
    itemDetail: boolean;
    transition: boolean;
    antiAlias: boolean;
    fontSize: number;
    smoothView: boolean;
    criticalGem: boolean;
    fixed: boolean;
    betterLoad: boolean;
    autoScale: boolean;
    paraLight: boolean;
    heroDetail: boolean;
}

const storage = new GameStorage<SettingStorage>(
    GameStorage.fromAuthor('AncTe', 'setting')
);

loading.once('coreInit', () => {
    mainSetting.reset({
        'screen.fullscreen': !!document.fullscreenElement,
        'screen.halo': !!storage.getValue('showHalo', true),
        'screen.itemDetail': !!storage.getValue('itemDetail', true),
        'screen.heroDetail': !!storage.getValue('heroDetail', false),
        'screen.transition': !!storage.getValue('transition', false),
        'screen.antiAlias': !!storage.getValue('antiAlias', false),
        'screen.fontSize': storage.getValue('fontSize', 16),
        'screen.smoothView': !!storage.getValue('smoothView', true),
        'screen.criticalGem': !!storage.getValue('criticalGem', false),
        'action.fixed': !!storage.getValue('fixed', true),
        'utils.betterLoad': !!storage.getValue('betterLoad', true),
        'utils.autoScale': !!storage.getValue('autoScale', true),
        'fx.paraLight': !!storage.getValue('paraLight', true),
        'fx.frag': !!storage.getValue('frag', true)
    });
});

hook.on('reset', () => {
    mainSetting.reset({
        'action.autoSkill': flags.autoSkill ?? true
    });
});