import { loadSettings } from "../settings";
import { RuntimeError } from "../engine/types";

export interface ChatMessage { role: "system" | "user" | "assistant"; content: string }

export function getAiConfig(): { baseUrl: string; apiKey: string; model: string } {
  return loadSettings().aiConfig;
}

export function requireAiConfig() {
  const config = getAiConfig();
  if (!config.baseUrl || !config.model) {
    throw new RuntimeError("ai_not_configured", "AI 服务未配置", { recommendation: "到 设置 → AI 服务 填写 Base URL 与模型名（兼容 OpenAI 协议）" });
  }
  return config;
}

export async function chatCompletion(messages: ChatMessage[], options: { temperature?: number } = {}): Promise<string> {
  const config = requireAiConfig();
  const base = config.baseUrl.replace(/\/+$/, "");
  const response = await fetch(base + "/chat/completions", {
    signal: AbortSignal.timeout(170000),
    method: "POST",
    headers: { "Content-Type": "application/json", Authorization: "Bearer " + config.apiKey },
    body: JSON.stringify({ model: config.model, messages, temperature: options.temperature ?? 0.3 })
  });
  if (!response.ok) {
    const detail = (await response.text()).slice(0, 300);
    throw new RuntimeError("ai_request_failed", "AI 请求失败（HTTP " + response.status + "）：" + detail);
  }
  const data = (await response.json()) as { choices?: Array<{ message?: { content?: string } }> };
  return data.choices?.[0]?.message?.content ?? "";
}