import { CASH_BASE } from '@scripts/constants/App';
import { sys } from 'cc';
import { ANDROID, IOS } from 'cc/env';

const STORAGE_ENCRYPTION_HEAD = 'a6072637';
const STORAGE_ENCRYPTION_PASSWORD = 'xbd4jl';
const STORAGE_ENCRYPTION_ENABLED = true;

/**
 * 将数字格式化为财务展示格式：使用千位分隔符并保留两位小数。
 * 例如：1234567.8 -> 1,234,567.80。
 */
export function formatCurrency(value: number | string, decimal = 0): string {
    if (typeof value === 'string') value = Number(value);
    if (!Number.isFinite(value)) value = 0;

    return value.toLocaleString('en-US', {
        minimumFractionDigits: decimal,
        maximumFractionDigits: decimal,
        useGrouping: true,
    });
}

export function formatSCNum(value: number | string) {
    return formatCurrency(value, 2);
}

export function formatGCNum(value: number | string) {
    return formatCurrency(value, 0);
}

export function formatCash(value: number) {
    value = Math.floor(value / CASH_BASE);
    return formatCurrency(value, 2);
}

const SHORT_MONTH_NAMES = [
    'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
    'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec',
];

/** Converts `YYYY-MM-DD HH:mm:ss.SSS` into `Mon D, HH:mm`. */
export function formatShortDateTime(value: string): string {
    const match = value.match(/^(\d{4})-(\d{1,2})-(\d{1,2})\s+(\d{1,2}):(\d{2})/);
    if (!match) return '';

    const month = Number(match[2]);
    const day = Number(match[3]);
    const hour = Number(match[4]);
    const minute = Number(match[5]);
    if (month < 1 || month > 12 || day < 1 || day > 31 || hour > 23 || minute > 59) return '';

    return `${SHORT_MONTH_NAMES[month - 1]} ${day}, ${hour.toString().padStart(2, '0')}:${minute.toString().padStart(2, '0')}`;
}

/**
 * 商品货币显示
 * 小于 10,000 时展示完整数值；小于 1,000,000 时向下取整为 K；
 * 其余数值向下截取到 0.01M，并固定展示两位小数。
 * @param value 商品数量
 */
export function formatGoodsNum(value: number): string {
    if (!Number.isFinite(value)) value = 0;

    if (value < 10_000) {
        let decimal = value % 1 > 0 ? 2 : 0;
        return value.toLocaleString('en-US', {
            minimumFractionDigits: decimal,
            maximumFractionDigits: 20,
            useGrouping: true,
        });
    }

    if (value < 1_000_000) {
        return `${Math.floor(value / 1_000)}K`;
    }

    return `${(Math.floor(value / 10_000) / 100).toFixed(2)}M`;
}

/**
 * 读取本地数据，并兼容 game_web_us2 写入的加密格式。
 */
export function localStorageGet<T = string>(key: string, defaultValue: T = '' as T): string | T {
    let value = sys.localStorage.getItem(key);
    if (value === null) return defaultValue;

    if (value.startsWith(STORAGE_ENCRYPTION_HEAD)) {
        try {
            value = decrypt(value.substring(STORAGE_ENCRYPTION_HEAD.length));
        } catch {
            // 与原项目保持一致：解密失败时返回空字符串。
            value = '';
        }
    }
    return value;
}

/**
 * 加密并保存本地数据。空字符串不加密，行为与 game_web_us2 保持一致。
 */
export function localStorageSet(key: string, value: unknown): void {
    let storageValue = value;
    if (STORAGE_ENCRYPTION_ENABLED && storageValue !== null && storageValue !== '') {
        const plainValue = typeof storageValue === 'string' ? storageValue : String(storageValue);
        storageValue = plainValue;
        try {
            storageValue = STORAGE_ENCRYPTION_HEAD + encrypt(plainValue);
        } catch {
            // 加密失败时沿用原值保存，兼容原项目行为。
        }
    }
    sys.localStorage.setItem(key, String(storageValue));
}

export function localStorageRemove(key: string): void {
    sys.localStorage.removeItem(key);
}

function encrypt(value: string, password = STORAGE_ENCRYPTION_PASSWORD): string {
    if (value === '') return '';

    const source = encodeURIComponent(value);
    const encodedPassword = encodeURIComponent(password || STORAGE_ENCRYPTION_PASSWORD);
    if (encodedPassword.length === 0) return '';

    let randomSeed = '';
    for (let index = 0; index < encodedPassword.length; index += 1) {
        randomSeed += encodedPassword.charCodeAt(index).toString();
    }

    const seedPosition = Math.floor(randomSeed.length / 5);
    const multiplier = Number.parseInt(
        randomSeed.charAt(seedPosition)
        + randomSeed.charAt(seedPosition * 2)
        + randomSeed.charAt(seedPosition * 3)
        + randomSeed.charAt(seedPosition * 4)
        + randomSeed.charAt(seedPosition * 5),
        10,
    );
    const increment = Math.ceil(encodedPassword.length / 2);
    const modulus = Math.pow(2, 31) - 1;
    if (multiplier < 2) return '';

    let salt = Math.round(Math.random() * 1_000_000_000) % 100_000_000;
    randomSeed += salt;
    randomSeed = reduceSeed(randomSeed);

    let pseudoRandom = (multiplier * Number(randomSeed) + increment) % modulus;
    let encrypted = '';
    for (let index = 0; index < source.length; index += 1) {
        const encryptedChar = source.charCodeAt(index) ^ Math.floor((pseudoRandom / modulus) * 255);
        encrypted += encryptedChar < 16
            ? `0${encryptedChar.toString(16)}`
            : encryptedChar.toString(16);
        pseudoRandom = (multiplier * pseudoRandom + increment) % modulus;
    }

    let saltHex = salt.toString(16);
    while (saltHex.length < 8) saltHex = `0${saltHex}`;
    return encrypted + saltHex;
}

function decrypt(value: string, password = STORAGE_ENCRYPTION_PASSWORD): string {
    if (value === '') return '';

    const encodedPassword = encodeURIComponent(password || STORAGE_ENCRYPTION_PASSWORD);
    if (value.length < 8 || encodedPassword.length === 0) return '';

    let randomSeed = '';
    for (let index = 0; index < encodedPassword.length; index += 1) {
        randomSeed += encodedPassword.charCodeAt(index).toString();
    }

    const seedPosition = Math.floor(randomSeed.length / 5);
    const multiplier = Number.parseInt(
        randomSeed.charAt(seedPosition)
        + randomSeed.charAt(seedPosition * 2)
        + randomSeed.charAt(seedPosition * 3)
        + randomSeed.charAt(seedPosition * 4)
        + randomSeed.charAt(seedPosition * 5),
        10,
    );
    const increment = Math.round(encodedPassword.length / 2);
    const modulus = Math.pow(2, 31) - 1;
    const salt = Number.parseInt(value.substring(value.length - 8), 16);
    const encrypted = value.substring(0, value.length - 8);

    randomSeed += salt;
    randomSeed = reduceSeed(randomSeed);

    let pseudoRandom = (multiplier * Number(randomSeed) + increment) % modulus;
    let decrypted = '';
    for (let index = 0; index < encrypted.length; index += 2) {
        const decryptedChar = Number.parseInt(encrypted.substring(index, index + 2), 16)
            ^ Math.floor((pseudoRandom / modulus) * 255);
        decrypted += String.fromCharCode(decryptedChar);
        pseudoRandom = (multiplier * pseudoRandom + increment) % modulus;
    }
    return decodeURIComponent(decrypted);
}

function reduceSeed(seed: string): string {
    let result = seed;
    while (result.length > 10) {
        let remaining = result;
        let total = 0;
        while (remaining.length > 0) {
            total += Number.parseInt(remaining.substring(0, 10), 10);
            remaining = remaining.substring(10);
        }
        result = total.toString();
    }
    return result;
}

/**
 * 进入平台判定:0=普通浏览器 1=iOS壳包 2=Android壳包 3=PWA(桌面图标/TWA 进入)
 * 用于按来源差异化展示(如提现页官网引流提示:桌面图标进入的玩家不显示)。
 * 壳包判定优先于 PWA;TWA 判定内联实现,避免 helpers→UAUtils 循环依赖。
 */
export function getEnterPlatform(): 0 | 1 | 2 | 3 {
    if (ANDROID) return 2;
    if (IOS) return 1;
    return 0;
}

export function createUUID() {
    const chars: string[] = [];
    const hexDigits = '0123456789abcdef';

    for (let index = 0; index < 36; index += 1) {
        chars[index] = hexDigits.charAt(
            Math.floor(Math.random() * 16),
        );
    }

    // UUID version 4：0100
    chars[14] = '4';

    // RFC variant：10xx
    const variant = (Number.parseInt(chars[19], 16) & 0x3) | 0x8;

    chars[19] = hexDigits.charAt(variant);

    chars[8] = '-';
    chars[13] = '-';
    chars[18] = '-';
    chars[23] = '-';

    return chars.join('');
}

export function getUrlParams(url: string) {
    const queryIndex = url.indexOf('?');
    const params = {};
    if (queryIndex >= 0) {
        url.slice(queryIndex + 1).split('&').forEach((entry) => {
            if (!entry) return;

            const separatorIndex = entry.indexOf('=');
            const rawKey = separatorIndex >= 0 ? entry.slice(0, separatorIndex) : entry;
            const rawValue = separatorIndex >= 0 ? entry.slice(separatorIndex + 1) : '';

            try {
                const key = decodeURIComponent(rawKey.replace(/\+/g, ' '));
                params[key] = decodeURIComponent(rawValue.replace(/\+/g, ' '));
            } catch {
                // Preserve malformed values instead of crashing the native callback.
                params[rawKey] = rawValue;
            }
        });
    }

    return params;
}

export function waitForSeconds(duration: number) {
    return new Promise((resolve, reject) => {
        setTimeout(resolve, duration * 1000)
    })
}

export function formatMaskContent(content: string, prefix: number, suffix: number) {
    const startIdx = Math.min(prefix, content.length);
    const endIdx = content.length - suffix;
    const first = content.substring(0, startIdx);
    const last = content.substring(endIdx, content.length)
    return `${first}***${last}`
}

export function formatMaskNickName(nickName: string) {
    return formatMaskContent(nickName, 2, 1);
}

export function formatMaskEmail(email: string) {
    if (!email || email.length === 0) return '';

    let index = email.indexOf('@');
    if (index === -1) return formatMaskContent(email, 2, 3);

    return formatMaskContent(email, 2, email.length - index);
}

export function checkIsEmail(str: string): boolean {
    const s = str.trim();
    if (!s) return false;
    const reg = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return reg.test(s);
}

export function safeFloor(num: number, decimal = 2) {
    let unit = Math.pow(10, decimal);
    return Math.floor(num * unit) / unit

}

export function formatMailTimeToMMDDYYYY(timeStr: string): string {
    const date = new Date(timeStr);
    if (isNaN(date.getTime())) {
        return ""; // 无效时间返回空
    }
    const month = String(date.getMonth() + 1).padStart(2, "0");
    const day = String(date.getDate()).padStart(2, "0");
    const year = date.getFullYear();
    return `${month}-${day}-${year}`;
}

export function parseMailRewardStr(str: string) {
    const result = [];
    const itemStrList = str.split(";").filter(Boolean);

    for (const itemStr of itemStrList) {
        const parts = itemStr.split(",");
        if (parts.length !== 2) continue;

        const type = parts[0]; // 直接字符串，不转数字！
        const rawRewardStr = parts[1];
        const rawReward = Number(rawRewardStr);
        if (isNaN(rawReward)) continue;
        if (rawReward == 0) continue;

        result.push({
            type,
            reward: rawReward / 100,
            rawReward: rawRewardStr
        });
    }
    return result;
}