/**
 * Legacy model aliases used by the old Hugging Face proxy.
 */

export const LEGACY_MODEL_ALIASES = Object.freeze({
    'antigravity/gemini-3-flash': 'gemini-3.5-flash-low',
    'gemini-3-flash': 'gemini-3.5-flash-low',
    'antigravity/gemini-3-pro-low': 'gemini-3.1-pro-low',
    'gemini-3-pro-low': 'gemini-3.1-pro-low',
    'antigravity/gemini-3-pro-high': 'gemini-3.1-pro-high',
    'gemini-3-pro-high': 'gemini-3.1-pro-high'
});

export function resolveCloudCodeApiModel(requestedModel) {
    const model = String(requestedModel || '').trim();
    if (/gemini-3(?:\.\d+)?-pro-high$/i.test(model)) {
        return model.replace(/pro-high$/i, 'pro-low');
    }
    return model;
}

export function applyProHighThinkingFallback(googleRequest, requestedModel) {
    if (!/gemini-3(?:\.\d+)?-pro-high$/i.test(String(requestedModel || ''))) {
        return;
    }
    googleRequest.generationConfig = googleRequest.generationConfig || {};
    googleRequest.generationConfig.thinkingConfig = {
        includeThoughts: true,
        thinkingLevel: 'high'
    };
}

export function stripProviderPrefix(modelName) {
    const model = String(modelName || '').trim();
    if (!model) return '';
    return model.startsWith('antigravity/') ? model.slice('antigravity/'.length) : model;
}

export function resolveModelAlias(modelName, configuredMappings = {}) {
    const original = String(modelName || '').trim();
    const stripped = stripProviderPrefix(original);

    const configured = configuredMappings?.[original]?.mapping
        || configuredMappings?.[stripped]?.mapping;
    if (configured) return configured;

    return LEGACY_MODEL_ALIASES[original]
        || LEGACY_MODEL_ALIASES[stripped]
        || stripped;
}

export function appendLegacyModelAliases(modelListResponse) {
    const data = Array.isArray(modelListResponse?.data)
        ? [...modelListResponse.data]
        : [];
    const existing = new Set(data.map(model => model.id));
    const created = Math.floor(Date.now() / 1000);

    for (const [alias, target] of Object.entries(LEGACY_MODEL_ALIASES)) {
        if (!alias.startsWith('antigravity/')) continue;
        if (!existing.has(target) || existing.has(alias)) continue;

        data.push({
            id: alias,
            object: 'model',
            created,
            owned_by: 'antigravity-proxy',
            description: `Legacy alias for ${target}`
        });
        existing.add(alias);
    }

    return {
        object: 'list',
        data
    };
}