import { BadRequestException, Injectable, ServiceUnavailableException } from '@nestjs/common';

@Injectable()
export class AdminDeployService {
  async triggerDeploy() {
    const url = (process.env.DEPLOY_WEBHOOK_URL || 'http://127.0.0.1:8095/deploy').trim();
    const secret = (process.env.DEPLOY_WEBHOOK_SECRET || '').trim();
    if (!secret) {
      throw new ServiceUnavailableException('未配置 DEPLOY_WEBHOOK_SECRET，无法触发发布');
    }

    let res: Response;
    try {
      res = await fetch(url, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-Deploy-Token': secret,
        },
        body: JSON.stringify({ source: 'admin' }),
      });
    } catch (err) {
      throw new ServiceUnavailableException(
        `无法连接部署 webhook：${err instanceof Error ? err.message : 'network error'}`,
      );
    }

    const text = await res.text();
    let data: { ok?: boolean; accepted?: boolean; started?: boolean; message?: string; skipped?: boolean } = {};
    try {
      data = text ? (JSON.parse(text) as typeof data) : {};
    } catch {
      throw new ServiceUnavailableException(`部署 webhook 返回非 JSON（HTTP ${res.status}）`);
    }

    if (res.status === 403) {
      throw new BadRequestException(data.message || '部署 webhook 鉴权失败');
    }
    if (!res.ok && res.status !== 202) {
      throw new ServiceUnavailableException(data.message || `部署 webhook 失败（HTTP ${res.status}）`);
    }

    return {
      accepted: true,
      started: data.started !== false && !data.skipped,
      message: data.message || (data.started === false ? 'deploy debounced' : 'deploy started'),
    };
  }
}