const API_BASE_URL = process.env.NEXT_PUBLIC_MINECRAFT_API_URL || 'http://localhost:6767';
const API_KEY = process.env.NEXT_PUBLIC_MINECRAFT_API_KEY;

interface ApiResponse<T = any> {
  success: boolean;
  message?: string;
  error?: string;
  details?: string;
  data?: T;
}

interface PlayerIdentifierInput {
  type: 'java' | 'bedrock';
  username: string;
}

interface PlayerIdentifierOutput {
  platform: 'java' | 'bedrock';
  username: string;
  uuid?: string;
  xuid?: string;
}

interface MojangResponse {
  id: string;
  name: string;
}

interface GeyserResponse {
  xuid: string;
  gamertag: string;
}

class MinecraftApiClient {
  private cache = new Map<string, PlayerIdentifierOutput>();
  private readonly CACHE_TTL = 5 * 60 * 1000; // 5 minutes

  private isCacheValid(timestamp: number): boolean {
    return Date.now() - timestamp < this.CACHE_TTL;
  }

  private getCacheKey(type: string, username: string): string {
    return `${type}:${username.toLowerCase()}`;
  }

  private formatUUID(uuid: string): string {
    // Convert UUID from Mojang format (no dashes) to dashed format
    return `${uuid.slice(0,8)}-${uuid.slice(8,12)}-${uuid.slice(12,16)}-${uuid.slice(16,20)}-${uuid.slice(20)}`;
  }

  private async resolveJavaUsername(username: string): Promise<PlayerIdentifierOutput> {
    const cacheKey = this.getCacheKey('java', username);
    const cached = this.cache.get(cacheKey);
    if (cached && this.isCacheValid((cached as any).timestamp)) {
      return cached;
    }

    try {
      const response = await fetch(`https://api.mojang.com/users/profiles/minecraft/${username}`, {
        headers: {
          'User-Agent': 'MinecraftResolver/1.0'
        }
      });

      if (response.status === 404) {
        throw new Error('Player not found');
      }

      if (response.status === 429) {
        throw new Error('Rate limit exceeded');
      }

      if (!response.ok) {
        throw new Error(`Mojang API error: ${response.status}`);
      }

      const data: MojangResponse = await response.json();
      const result: PlayerIdentifierOutput = {
        platform: 'java',
        username: data.name,
        uuid: this.formatUUID(data.id)
      };

      // Cache with timestamp
      (result as any).timestamp = Date.now();
      this.cache.set(cacheKey, result);

      return result;
    } catch (error) {
      throw new Error(`Failed to resolve Java username: ${error instanceof Error ? error.message : 'Unknown error'}`);
    }
  }

  private async resolveBedrockGamertag(gamertag: string): Promise<PlayerIdentifierOutput> {
    const cacheKey = this.getCacheKey('bedrock', gamertag);
    const cached = this.cache.get(cacheKey);
    if (cached && this.isCacheValid((cached as any).timestamp)) {
      return cached;
    }

    try {
      // Try GeyserMC API first (most reliable for public use)
      const response = await fetch(`https://api.geysermc.org/v2/xbox/xuid/${encodeURIComponent(gamertag)}`, {
        headers: {
          'User-Agent': 'MinecraftResolver/1.0'
        }
      });

      if (response.status === 404) {
        throw new Error('Gamertag not found');
      }

      if (response.status === 429) {
        throw new Error('Rate limit exceeded');
      }

      if (!response.ok) {
        throw new Error(`GeyserMC API error: ${response.status}`);
      }

      const data: GeyserResponse = await response.json();
      const result: PlayerIdentifierOutput = {
        platform: 'bedrock',
        username: data.gamertag,
        xuid: data.xuid
      };

      // Cache with timestamp
      (result as any).timestamp = Date.now();
      this.cache.set(cacheKey, result);

      return result;
    } catch (error) {
      throw new Error(`Failed to resolve Bedrock gamertag: ${error instanceof Error ? error.message : 'Unknown error'}`);
    }
  }

  async resolvePlayerIdentifier(input: PlayerIdentifierInput): Promise<PlayerIdentifierOutput> {
    if (!input.username || input.username.trim().length === 0) {
      throw new Error('Username is required');
    }

    const trimmedUsername = input.username.trim();

    if (input.type === 'java') {
      return this.resolveJavaUsername(trimmedUsername);
    } else if (input.type === 'bedrock') {
      return this.resolveBedrockGamertag(trimmedUsername);
    } else {
      throw new Error('Invalid platform type. Must be "java" or "bedrock"');
    }
  }
  private async request<T = any>(
    endpoint: string,
    options: RequestInit = {}
  ): Promise<ApiResponse<T>> {
    const url = `${API_BASE_URL}${endpoint}`;
    const headers: Record<string, string> = {
      'Content-Type': 'application/json',
      ...(options.headers as Record<string, string> || {}),
    };

    if (API_KEY) {
      headers.Authorization = `Bearer ${API_KEY}`;
    }

    try {
      const response = await fetch(url, {
        ...options,
        headers,
      });

      const data = await response.json();

      if (!response.ok) {
        return {
          success: false,
          error: data.error || 'Request failed',
          details: data.details,
        };
      }

      return {
        success: true,
        data,
        message: data.message,
      };
    } catch (error) {
      return {
        success: false,
        error: 'Network error',
        details: error instanceof Error ? error.message : 'Unknown error',
      };
    }
  }

  async rewardPlayer(playerName: string): Promise<ApiResponse> {
    return this.request('/reward', {
      method: 'POST',
      body: JSON.stringify({ player: playerName }),
    });
  }

  async addToWhitelist(playerName: string): Promise<ApiResponse> {
    return this.request('/api/whitelist/add', {
      method: 'POST',
      body: JSON.stringify({ player: playerName }),
    });
  }

  async removeFromWhitelist(playerName: string): Promise<ApiResponse> {
    return this.request('/api/whitelist/remove', {
      method: 'POST',
      body: JSON.stringify({ player: playerName }),
    });
  }

  async getWhitelist(): Promise<ApiResponse<{ whitelist: string }>> {
    return this.request('/api/whitelist/list', {
      method: 'GET',
    });
  }

  async executeCommand(command: string): Promise<ApiResponse<{ response: string }>> {
    return this.request('/api/command', {
      method: 'POST',
      body: JSON.stringify({ command }),
    });
  }
}

export const minecraftApi = new MinecraftApiClient();
export type { ApiResponse, PlayerIdentifierInput, PlayerIdentifierOutput };