import { Capacitor } from "@capacitor/core";
import { Clipboard } from "@capacitor/clipboard";
import { useClipboard } from "@vueuse/core";
import { logger } from "@/utils/logger";

/**
 * Platform-agnostic clipboard service that handles both web and native platforms
 * Provides reliable clipboard functionality across all platforms including iOS
 */
export class ClipboardService {
  private static instance: ClipboardService | null = null;

  /**
   * Get singleton instance of ClipboardService
   */
  public static getInstance(): ClipboardService {
    if (!ClipboardService.instance) {
      ClipboardService.instance = new ClipboardService();
    }
    return ClipboardService.instance;
  }

  /**
   * Copy text to clipboard with platform-specific handling
   *
   * @param text - The text to copy to clipboard
   * @returns Promise that resolves when copy is complete
   * @throws Error if copy operation fails
   */
  public async copyToClipboard(text: string): Promise<void> {
    const platform = Capacitor.getPlatform();
    const isNative = Capacitor.isNativePlatform();

    logger.debug("[ClipboardService] Copying to clipboard:", {
      text: text.substring(0, 50) + (text.length > 50 ? "..." : ""),
      platform,
      isNative,
      timestamp: new Date().toISOString(),
    });

    try {
      if (isNative && (platform === "ios" || platform === "android")) {
        // Use native Capacitor clipboard for mobile platforms
        await this.copyNative(text);
      } else {
        // Use web clipboard API for web/desktop platforms
        await this.copyWeb(text);
      }

      logger.debug("[ClipboardService] Copy successful", {
        platform,
        timestamp: new Date().toISOString(),
      });
    } catch (error) {
      logger.error("[ClipboardService] Copy failed:", {
        error: error instanceof Error ? error.message : String(error),
        platform,
        timestamp: new Date().toISOString(),
      });
      throw error;
    }
  }

  /**
   * Copy text using native Capacitor clipboard API
   *
   * @param text - The text to copy
   * @returns Promise that resolves when copy is complete
   */
  private async copyNative(text: string): Promise<void> {
    try {
      await Clipboard.write({
        string: text,
      });
    } catch (error) {
      logger.error("[ClipboardService] Native copy failed:", {
        error: error instanceof Error ? error.message : String(error),
        timestamp: new Date().toISOString(),
      });
      throw new Error(
        `Native clipboard copy failed: ${error instanceof Error ? error.message : String(error)}`,
      );
    }
  }

  /**
   * Copy text using web clipboard API with fallback
   *
   * @param text - The text to copy
   * @returns Promise that resolves when copy is complete
   */
  private async copyWeb(text: string): Promise<void> {
    try {
      // Try VueUse clipboard first (handles some edge cases)
      const { copy } = useClipboard();
      await copy(text);
    } catch (error) {
      logger.warn(
        "[ClipboardService] VueUse clipboard failed, trying native API:",
        {
          error: error instanceof Error ? error.message : String(error),
          timestamp: new Date().toISOString(),
        },
      );

      // Fallback to native navigator.clipboard
      if (navigator.clipboard && navigator.clipboard.writeText) {
        await navigator.clipboard.writeText(text);
      } else {
        throw new Error("Clipboard API not supported in this browser");
      }
    }
  }

  /**
   * Read text from clipboard (platform-specific)
   *
   * @returns Promise that resolves to the clipboard text
   * @throws Error if read operation fails
   */
  public async readFromClipboard(): Promise<string> {
    const platform = Capacitor.getPlatform();
    const isNative = Capacitor.isNativePlatform();

    try {
      if (isNative && (platform === "ios" || platform === "android")) {
        // Use native Capacitor clipboard for mobile platforms
        const result = await Clipboard.read();
        return result.value || "";
      } else {
        // Use web clipboard API for web/desktop platforms
        if (navigator.clipboard && navigator.clipboard.readText) {
          return await navigator.clipboard.readText();
        } else {
          throw new Error("Clipboard read API not supported in this browser");
        }
      }
    } catch (error) {
      logger.error("[ClipboardService] Read from clipboard failed:", {
        error: error instanceof Error ? error.message : String(error),
        platform,
        timestamp: new Date().toISOString(),
      });
      throw error;
    }
  }

  /**
   * Check if clipboard is supported on current platform
   *
   * @returns boolean indicating if clipboard is supported
   */
  public isSupported(): boolean {
    const platform = Capacitor.getPlatform();
    const isNative = Capacitor.isNativePlatform();

    if (isNative && (platform === "ios" || platform === "android")) {
      return true; // Capacitor clipboard should work on native platforms
    }

    // Check web clipboard support
    return !!(navigator.clipboard && navigator.clipboard.writeText);
  }
}

/**
 * Convenience function to copy text to clipboard
 * Uses the singleton ClipboardService instance
 *
 * @param text - The text to copy to clipboard
 * @returns Promise that resolves when copy is complete
 */
export async function copyToClipboard(text: string): Promise<void> {
  return ClipboardService.getInstance().copyToClipboard(text);
}

/**
 * Convenience function to read text from clipboard
 * Uses the singleton ClipboardService instance
 *
 * @returns Promise that resolves to the clipboard text
 */
export async function readFromClipboard(): Promise<string> {
  return ClipboardService.getInstance().readFromClipboard();
}