import { existsSync, createWriteStream, mkdirSync } from "fs";
import { dirname } from "path";
import axios from "axios";
import { Logger } from "@nestjs/common";

export class ImageUtils {
  private static readonly logger = new Logger("ImageUtils");

  /**
   * Downloads an image from a URL and saves it to a local path.
   * Skips download if file already exists.
   */
  static async downloadImage(url: string, localPath: string): Promise<boolean> {
    try {
      // Check if file exists
      if (existsSync(localPath)) {
        return true;
      }

      // Ensure directory exists
      const dir = dirname(localPath);
      if (!existsSync(dir)) {
        mkdirSync(dir, { recursive: true });
      }

      // Download
      const response = await axios({
        url,
        method: "GET",
        responseType: "stream",
        timeout: 5000,
        validateStatus: (status) => status === 200, // Only save if 200 OK
      });

      const writer = createWriteStream(localPath);

      response.data.pipe(writer);

      return new Promise((resolve, reject) => {
        writer.on("finish", () => resolve(true));
        writer.on("error", (err) => {
          this.logger.warn(
            `Failed to write image to ${localPath}: ${err.message}`,
          );
          reject(new Error(`Failed to write image to ${localPath}`));
        });
      });
    } catch (error: any) {
      // Log warning but don't break the application
      // 404s are common for missing logos
      if (error.response?.status !== 404) {
        this.logger.warn(
          `Failed to download image from ${url}: ${error.message}`,
        );
      }
      return false;
    }
  }
}