import { anthropic } from '@ai-sdk/anthropic';
import { openai } from '@ai-sdk/openai';
import type { LanguageModel } from 'ai';

// Pure factory — no DI. Caller passes provider/model (admin-editable, from
// AiConfigService) and the API key (env-driven, ops-owned). Decoupling means
// the model can be re-built per request without re-instantiating the caller
// service, so admin updates to provider/model take effect immediately.

export type AiProviderOpts = {
    provider: string;
    model: string;
    anthropicApiKey?: string;
    openaiApiKey?: string;
};

export function createAiModel(opts: AiProviderOpts): LanguageModel | null {
    if (opts.provider === 'anthropic') {
        if (!opts.anthropicApiKey) return null;
        return anthropic(opts.model);
    }
    // Default to openai
    if (!opts.openaiApiKey) return null;
    return openai(opts.model);
}

export function isAiConfigured(opts: AiProviderOpts): boolean {
    if (opts.provider === 'anthropic') return !!opts.anthropicApiKey;
    return !!opts.openaiApiKey;
}