/**
 * Alpha Air 专用节点清理脚本
 * - 压掉提供者、三网、家宽等 Alpha Air 专属文案
 * - 普通节点只保留地区，非倍率高级节点保留供应商，倍率节点保留倍率
 * - 按地区内“普通 -> 倍率 -> 高级”排序并连续编号
 * - 不追加订阅后缀，整合订阅最后仍交给 rename.js 处理
 */
function operator(proxies) {
    const regionAliases = [
        ['美国夏威夷', 'US HNL'],
        ['家宽夏威夷', 'US HNL'],
        ['夏威夷', 'US HNL'],
        ['Hawaii', 'US HNL'],
        ['United States', 'US'],
        ['America', 'US'],
        ['USA', 'US'],
        ['美国', 'US'],
        ['美西', 'US'],
        ['Japan', 'JP'],
        ['日本', 'JP'],
        ['Taiwan', 'TW'],
        ['台湾', 'TW'],
        ['Hong Kong', 'HK'],
        ['香港', 'HK'],
        ['Singapore', 'SG'],
        ['新加坡', 'SG'],
        ['Netherlands', 'NL'],
        ['荷兰', 'NL'],
        ['Korea', 'KR'],
        ['韩国', 'KR'],
        ['Germany', 'DE'],
        ['德国', 'DE'],
        ['United Kingdom', 'UK'],
        ['英国', 'UK']
    ];
    const sortedRegionAliases = regionAliases
        .map(([alias, replacement]) => [alias, replacement, alias.toLowerCase()])
        .sort((firstAlias, secondAlias) => secondAlias[0].length - firstAlias[0].length);
    const leadingFlagRegex = /^([\u{1F1E6}-\u{1F1FF}]{2})\s*/u;
    const inlineFlagRegex = /^(.{1,24}?)([\u{1F1E6}-\u{1F1FF}]{2})\s*(.*)$/u;

    const flagToRegionCode = flag => {
        if (!flag) return '';
        const codePoints = [...flag].map(char => char.codePointAt(0));
        if (
            codePoints.length !== 2 ||
            codePoints.some(codePoint => codePoint < 0x1F1E6 || codePoint > 0x1F1FF)
        ) {
            return '';
        }

        const regionCode = codePoints
            .map(codePoint => String.fromCharCode(codePoint - 0x1F1E6 + 65))
            .join('');
        return regionCode === 'GB' ? 'UK' : regionCode;
    };

    const regionCodeToFlag = regionCode => {
        const flagCode = regionCode === 'UK' ? 'GB' : regionCode;
        if (!/^[A-Z]{2}$/.test(flagCode)) return '';

        return flagCode
            .split('')
            .map(char => String.fromCodePoint(char.charCodeAt(0) - 65 + 0x1F1E6))
            .join('');
    };

    const stripExistingSuffix = name => name
        .replace(/\s+-\s*Alpha Air(?:\s+\d{2})?\s*$/i, '')
        .trim();

    const stripFlag = name => {
        const leadingFlagMatch = name.match(leadingFlagRegex);
        if (leadingFlagMatch) {
            return {
                flag: leadingFlagMatch[1],
                text: name.slice(leadingFlagMatch[0].length).trim()
            };
        }

        const inlineFlagMatch = name.match(inlineFlagRegex);
        if (!inlineFlagMatch) return { flag: '', text: name.trim() };

        const prefix = inlineFlagMatch[1].trim();
        const rest = inlineFlagMatch[3].trim();
        return {
            flag: inlineFlagMatch[2],
            text: rest ? `${prefix} ${rest}`.trim() : prefix
        };
    };

    const multiplierOf = name => {
        const match = name.match(/\b(\d+(?:\.\d+)?)(?:\s*[xX]|倍)\b/i);
        return match ? `${match[1]}X` : '';
    };

    const providerOf = name => {
        if (/SkyStroll/i.test(name)) return 'SkyStroll';
        if (/isif/i.test(name)) return 'ISIF';
        if (/(?:搬瓦工|Bandwagon|BWH|BWG)/i.test(name)) return 'BWH';
        return '';
    };

    const leadingRegionPrefixOf = name => {
        const match = name.match(/^([A-Z]{2})(?:\s+([A-Z]{3}))?(?=\s|$|-|\d|\|)/);
        if (!match) return '';
        return match[2] ? `${match[1]} ${match[2]}` : match[1];
    };

    const aliasRegionPrefixOf = name => {
        const cleanNameLower = name.toLowerCase();
        for (const [alias, replacement, aliasLower] of sortedRegionAliases) {
            if (cleanNameLower.includes(aliasLower)) return replacement;
        }

        if (/\bhk\b/i.test(name)) return 'HK';
        if (/\bsg\b/i.test(name)) return 'SG';
        if (/\bjp\b/i.test(name)) return 'JP';
        if (/\btw\b/i.test(name)) return 'TW';
        if (/\bus\b/i.test(name)) return 'US';

        return '';
    };

    const regionPrefixOf = (name, flagRegionCode) => {
        if (/(?:Hinet|Seednet)/i.test(name)) return 'TW';

        return aliasRegionPrefixOf(name) ||
            leadingRegionPrefixOf(name) ||
            flagRegionCode ||
            '';
    };

    const normalizeProxy = (proxy, originalIndex) => {
        const rawName = typeof proxy.name === 'string' ? proxy.name : '';
        const cleanName = stripExistingSuffix(rawName);
        const { flag, text } = stripFlag(cleanName);
        const flagRegionCode = flagToRegionCode(flag);
        const regionPrefix = regionPrefixOf(text, flagRegionCode);
        const regionCode = regionPrefix.split(/\s+/)[0];
        const cityCode = regionPrefix.split(/\s+/)[1] || '';
        const multiplier = multiplierOf(text);
        const provider = multiplier ? '' : providerOf(text);
        const normalizedFlag = regionCodeToFlag(regionCode);

        return {
            proxy,
            originalIndex,
            countryCode: regionCode,
            cityCode,
            provider,
            providerRank: provider ? 1 : 0,
            multiplierValue: multiplier ? Number(multiplier.replace(/X$/i, '')) : Number.NEGATIVE_INFINITY,
            normalizedName: [normalizedFlag, regionPrefix, provider, multiplier].filter(Boolean).join(' ').trim()
        };
    };

    const countryOrder = Object.create(null);
    const normalizedItems = proxies.map((proxy, proxyIndex) => {
        const normalizedItem = normalizeProxy(proxy, proxyIndex);
        if (
            normalizedItem.countryCode &&
            countryOrder[normalizedItem.countryCode] === undefined
        ) {
            countryOrder[normalizedItem.countryCode] = Object.keys(countryOrder).length;
        }
        return normalizedItem;
    });

    normalizedItems.sort((firstItem, secondItem) => {
        const firstOrder = countryOrder[firstItem.countryCode];
        const secondOrder = countryOrder[secondItem.countryCode];
        if (firstOrder !== secondOrder) return firstOrder - secondOrder;
        if (firstItem.providerRank !== secondItem.providerRank) {
            return firstItem.providerRank - secondItem.providerRank;
        }
        if (firstItem.multiplierValue !== secondItem.multiplierValue) {
            return firstItem.multiplierValue - secondItem.multiplierValue;
        }

        const firstCityRank = firstItem.cityCode ? 1 : 0;
        const secondCityRank = secondItem.cityCode ? 1 : 0;
        if (firstCityRank !== secondCityRank) return firstCityRank - secondCityRank;

        return firstItem.originalIndex - secondItem.originalIndex;
    });

    const currentCount = Object.create(null);
    return normalizedItems.map(item => {
        if (!item.normalizedName || !item.countryCode) return item.proxy;

        currentCount[item.countryCode] = (currentCount[item.countryCode] || 0) + 1;
        item.proxy.name = `${item.normalizedName} ${String(currentCount[item.countryCode]).padStart(2, '0')}`;
        return item.proxy;
    });
}