export interface SerperVideoResult {
  title: string;
  link: string;
  snippet?: string;
  date?: string;
  duration?: string;
  channel?: string;
}

export interface SerperVideoResponse {
  searchParameters: any;
  videos: SerperVideoResult[];
}

export interface SerperWebResult {
  title: string;
  link: string;
  snippet: string;
  date?: string;
  sitelinks?: any[];
  position: number;
}

export interface SerperWebResponse {
  searchParameters: any;
  organic: SerperWebResult[];
}

export class SerperClient {
  private apiKey: string;

  constructor(apiKey?: string) {
    const key = apiKey || process.env.SERPER_API_KEY;
    if (!key) {
      console.warn("⚠️ SERPER_API_KEY is not defined. SerperClient will fail.");
    }
    this.apiKey = key || "";
  }

  /**
   * Performs a video search via Serper (Google Video Search).
   * Great for finding relevant YouTube videos.
   */
  async searchVideos(
    query: string,
    num: number = 5,
  ): Promise<SerperVideoResult[]> {
    if (!this.apiKey) {
      console.error("❌ SERPER_API_KEY missing - cannot execute search.");
      return [];
    }

    try {
      console.log(`🔍 [Serper] Searching videos for: "${query}"`);
      const response = await fetch("https://google.serper.dev/videos", {
        method: "POST",
        headers: {
          "X-API-KEY": this.apiKey,
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          q: query,
          num: num,
          gl: "de", // Germany for localized results
          hl: "de", // German language
        }),
      });

      if (!response.ok) {
        console.error(
          `❌ [Serper] API Error: ${response.status} ${response.statusText}`,
        );
        const text = await response.text();
        console.error(text);
        return [];
      }

      const data = (await response.json()) as SerperVideoResponse;
      return data.videos || [];
    } catch (e) {
      console.error("❌ [Serper] Request failed", e);
      return [];
    }
  }

  /**
   * Performs a standard web search via Serper.
   * Crucial for B2B competitor analysis and context gathering.
   */
  async searchWeb(query: string, num: number = 5): Promise<SerperWebResult[]> {
    if (!this.apiKey) {
      console.error("❌ SERPER_API_KEY missing - cannot execute web search.");
      return [];
    }

    try {
      console.log(`🔍 [Serper] Web Search for Competitor Insights: "${query}"`);
      const response = await fetch("https://google.serper.dev/search", {
        method: "POST",
        headers: {
          "X-API-KEY": this.apiKey,
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          q: query,
          num: num,
          gl: "de", // Germany for localized results
          hl: "de", // German language
        }),
      });

      if (!response.ok) {
        console.error(
          `❌ [Serper] API Error: ${response.status} ${response.statusText}`,
        );
        const text = await response.text();
        console.error(text);
        return [];
      }

      const data = (await response.json()) as SerperWebResponse;
      return data.organic || [];
    } catch (e) {
      console.error("❌ [Serper] Web Request failed", e);
      return [];
    }
  }
}