import { createGoogleGenerativeAI } from '@ai-sdk/google';
import { GatewayFetchError } from '~~/server/utils/ai-provider';
import { Err, Ok } from '~~/types/result';
import type { ProviderModule } from '.';
import { getModelData } from './helpers';

export default {
    id: 'google',
    baseUrl: 'https://generativelanguage.googleapis.com/v1beta',
    modelsEndpoint: '/models',

    createGateway({ apiKey, baseURL }) {
        if (apiKey === undefined) {
            return Err(GatewayFetchError.NoProviderApiKey);
        }

        return Ok({
            gateway: createGoogleGenerativeAI({ apiKey, baseURL }),
            streamTransformer: undefined,
            textTransformer: undefined,
        });
    },

    getAuthHeaders(apiKey) {
        return apiKey ? { 'x-goog-api-key': apiKey } : {};
    },

    async fetchModels({ baseURL, apiKey, modelsDevData }) {
        const res = await fetch(`${baseURL}/models`, {
            method: 'GET',
            headers: { 'x-goog-api-key': `${apiKey}` },
        });
        const data = await res.json();

        if (!res.ok) {
            throw createError({ statusCode: res.status, message: JSON.stringify(data) });
        }

        return data.models.map((model: any) => ({
            ...getModelData(model.name.replace('models/', ''), 'google', modelsDevData),
            id: model.name.replace('models/', ''),
            name: model.displayName,
        }));
    },
} satisfies ProviderModule;