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

export default {
    id: 'openai',
    baseUrl: 'https://api.openai.com/v1',
    modelsEndpoint: '/models',

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

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

    getAuthHeaders(apiKey) {
        return apiKey ? { Authorization: `Bearer ${apiKey}` } : {};
    },

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

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

        return data.data
            .filter((model: any) => model.object === 'model')
            .map((model: any) => ({
                ...getModelData(model.id, 'openai', modelsDevData),
                id: model.id,
                name: model.id,
            }));
    },
} satisfies ProviderModule;