import { langConfig } from './config-external.js';

// 缓存已加载的语言包
const loadedLangPacks = {};

// 处理页面目录映射
function processRoutePath(route) {
    let routeParts = route.split("/");

    // ---- 处理页面目录映射 <begin> 分包造成的，需要根据实际目录结构进行映射----
    if (routeParts[0] === 'pages_tool') {
        routeParts = [routeParts[1], ...routeParts.slice(2)];
    } else if (routeParts[0] === 'pages_goods') {
        routeParts[0] = 'goods';
    } else if (routeParts[0] === 'pages_member') {
        routeParts[0] = 'member';
    } else if (routeParts[0] === 'pages_order') {
        routeParts[0] = 'order';
    } else if (routeParts[0] === 'pages_promotion') {
        const promotionModules = ['point', 'fenxiao', 'merch'];
        if (routeParts[1] && promotionModules.includes(routeParts[1])) {
            routeParts = [routeParts[1], ...routeParts.slice(2)];
        }
    }
    // ---- 处理页面目录映射 <end>----
    
    if (routeParts[0] === 'pages') {
        routeParts = routeParts.slice(1);
    } 
    
    return routeParts.join("/");
}

// 加载语言包（同步方式）
function loadLangPackSync(lang, path) {
    try {
        if (loadedLangPacks[`${lang}_${path}`]) {
            return loadedLangPacks[`${lang}_${path}`];
        }
        const langData = require(`@/lang/${lang}/${path}.js`).lang;
        loadedLangPacks[`${lang}_${path}`] = langData;
        return langData;
    } catch (error) {
        console.error(`加载语言包 ${lang}/${path} 失败:`, error);
        return {};
    }
}

export default {
    langList: langConfig.langList,
    /**
     * 解析多语言
     */
    lang(field) {
        let _this = getCurrentPages()[getCurrentPages().length - 1];
        if (!_this) return;

        const locale = uni.getStorageSync('lang') || "zh-cn";

        let value = '';
        let langPath = '';

        try {
            var lang = loadLangPackSync(locale, 'common');
            
            let route = _this.route;
            langPath = processRoutePath(route);
            
            let currentPageLang = loadLangPackSync(locale, langPath);

            let mergedLang = { ...lang, ...currentPageLang };

            var arr = field.split(".");
            if (arr.length > 1) {
                let temp = mergedLang;
                let found = true;
                for (let key of arr) {
                    if (temp[key] !== undefined) {
                        temp = temp[key];
                    } else {
                        found = false;
                        break;
                    }
                }
                value = found ? temp : field;
            } else {
                value = mergedLang[field] !== undefined ? mergedLang[field] : field;
            }
            
        } catch (e) {
            console.error('解析语言包失败:', e, { langPath, field, locale });
            value = field;
        }

        if (arguments.length > 1) {
            for (var i = 1; i < arguments.length; i++) {
                value = value.replace("{" + (i - 1) + "}", arguments[i]);
            }
        }
        if (value == undefined || (value == 'title' && field == 'title')) value = '';

        if (field == value) {
            console.warn(`警告: 字段 ${field} 在语言包 ${langPath} 中未找到对应值，使用默认值 ${field} 当前语言: ${locale}`);		
        }

        return value;
    },
    /**
     * 切换语言
     */
    change(value, url = '/pages_tool/member/index') {
        let _this = getCurrentPages()[getCurrentPages().length - 1];
        if (!_this) return;

        uni.setStorageSync("lang", value);
        const locale = uni.getStorageSync('lang') || "zh-cn";

        // ✅ 关键修复：清空所有语言包缓存（不再保留任何旧缓存）
        for (let key in loadedLangPacks) {
            delete loadedLangPacks[key];
        }

        this.refresh();

        if (url) {
            uni.reLaunch({ url: url });
        }
    },
    //刷新标题、tabbar
    refresh() {
        let _this = getCurrentPages()[getCurrentPages().length - 1];
        if (!_this) return;
        const locale = uni.getStorageSync('lang') || "zh-cn";
    
        this.title(this.lang("title"));
    },
    title(str) {
        if (str) {
            uni.setNavigationBarTitle({
                title: str
            });
        }
    },
    // 获取语言包列表
    list() {
        var list = [];
        try {
            for (var i = 0; i < langConfig.langList.length; i++) {
                let langType = langConfig.langList[i];
                let item = loadLangPackSync(langType, 'common');
                list.push({
                    name: item.common ? item.common.name : langType,
                    value: langType
                });
            }
        } catch (e) {
            console.error('获取语言包列表失败:', e);
        }
        return list;
    }
}