import * as plugins from './plugins.js';
import { logger } from './unifi.logger.js';
import type { THttpMethod } from './interfaces/index.js';

/**
 * Extended response type
 */
export interface IUnifiHttpResponse<T = any> {
  ok: boolean;
  status: number;
  statusText?: string;
  headers?: Record<string, string | string[]>;
  body: T;
  text: () => Promise<string>;
  json: () => Promise<T>;
}

/**
 * Base HTTP client for UniFi APIs with SSL handling and authentication support
 */
export class UnifiHttp {
  private baseUrl: string;
  private headers: Record<string, string> = {};
  private verifySsl: boolean;
  private cookies: string[] = [];

  constructor(baseUrl: string, verifySsl: boolean = false) {
    this.baseUrl = baseUrl.replace(/\/$/, ''); // Remove trailing slash
    this.verifySsl = verifySsl;
  }

  /**
   * Set a header value
   */
  public setHeader(name: string, value: string): void {
    this.headers[name] = value;
  }

  /**
   * Remove a header
   */
  public removeHeader(name: string): void {
    delete this.headers[name];
  }

  /**
   * Set cookies from Set-Cookie headers
   */
  public setCookies(cookies: string[]): void {
    this.cookies = cookies;
  }

  /**
   * Get the cookie header string
   */
  public getCookieHeader(): string {
    return this.cookies
      .map((cookie) => cookie.split(';')[0])
      .join('; ');
  }

  /**
   * Build request with common options
   */
  private buildRequest(url: string, data?: unknown): plugins.smartrequest.SmartRequestClient {
    let requestBuilder = plugins.smartrequest.SmartRequestClient.create()
      .url(url)
      .header('Content-Type', 'application/json');

    // Add stored headers
    for (const [name, value] of Object.entries(this.headers)) {
      requestBuilder = requestBuilder.header(name, value);
    }

    // Add cookies
    const cookieHeader = this.getCookieHeader();
    if (cookieHeader) {
      requestBuilder = requestBuilder.header('Cookie', cookieHeader);
    }

    // Add JSON data
    if (data) {
      requestBuilder = requestBuilder.json(data);
    }

    return requestBuilder;
  }

  /**
   * Make an HTTP request
   */
  public async request<T>(
    method: THttpMethod,
    endpoint: string,
    data?: unknown
  ): Promise<T> {
    const url = `${this.baseUrl}${endpoint}`;

    logger.log('debug', `UniFi HTTP ${method} ${url}`);

    const requestBuilder = this.buildRequest(url, data);

    let response: plugins.smartrequest.IExtendedIncomingMessage;

    // Note: smartrequest v2 doesn't have built-in SSL bypass, but Node's default is fine for most cases
    // For self-signed certs, we need to handle at the environment level or use NODE_TLS_REJECT_UNAUTHORIZED
    const originalRejectUnauthorized = process.env.NODE_TLS_REJECT_UNAUTHORIZED;
    if (!this.verifySsl) {
      process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';
    }

    try {
      switch (method) {
        case 'GET':
          response = await requestBuilder.get();
          break;
        case 'POST':
          response = await requestBuilder.post();
          break;
        case 'PUT':
          response = await requestBuilder.put();
          break;
        case 'DELETE':
          response = await requestBuilder.delete();
          break;
        case 'PATCH':
          response = await requestBuilder.patch();
          break;
        default:
          throw new Error(`Unsupported HTTP method: ${method}`);
      }
    } finally {
      if (!this.verifySsl) {
        if (originalRejectUnauthorized !== undefined) {
          process.env.NODE_TLS_REJECT_UNAUTHORIZED = originalRejectUnauthorized;
        } else {
          delete process.env.NODE_TLS_REJECT_UNAUTHORIZED;
        }
      }
    }

    // Store cookies from response
    const setCookieHeaders = response.headers?.['set-cookie'];
    if (setCookieHeaders && Array.isArray(setCookieHeaders)) {
      this.setCookies(setCookieHeaders);
    }

    // Check for HTTP errors
    const statusCode = response.statusCode || 0;
    if (statusCode >= 400) {
      const errorBody = typeof response.body === 'string' ? response.body : JSON.stringify(response.body);
      logger.log('error', `UniFi HTTP error: ${statusCode} - ${errorBody}`);
      throw new Error(`HTTP ${statusCode}: ${response.statusMessage || 'Unknown'} - ${errorBody}`);
    }

    // Return body directly
    return response.body as T;
  }

  /**
   * Make a raw request returning the full response (for handling cookies/headers)
   */
  public async rawRequest(
    method: THttpMethod,
    endpoint: string,
    data?: unknown
  ): Promise<IUnifiHttpResponse> {
    const url = `${this.baseUrl}${endpoint}`;

    logger.log('debug', `UniFi HTTP raw ${method} ${url}`);

    const requestBuilder = this.buildRequest(url, data);

    let response: plugins.smartrequest.IExtendedIncomingMessage;

    const originalRejectUnauthorized = process.env.NODE_TLS_REJECT_UNAUTHORIZED;
    if (!this.verifySsl) {
      process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';
    }

    try {
      switch (method) {
        case 'GET':
          response = await requestBuilder.get();
          break;
        case 'POST':
          response = await requestBuilder.post();
          break;
        case 'PUT':
          response = await requestBuilder.put();
          break;
        case 'DELETE':
          response = await requestBuilder.delete();
          break;
        case 'PATCH':
          response = await requestBuilder.patch();
          break;
        default:
          throw new Error(`Unsupported HTTP method: ${method}`);
      }
    } finally {
      if (!this.verifySsl) {
        if (originalRejectUnauthorized !== undefined) {
          process.env.NODE_TLS_REJECT_UNAUTHORIZED = originalRejectUnauthorized;
        } else {
          delete process.env.NODE_TLS_REJECT_UNAUTHORIZED;
        }
      }
    }

    // Store cookies from response
    const setCookieHeaders = response.headers?.['set-cookie'];
    if (setCookieHeaders && Array.isArray(setCookieHeaders)) {
      this.setCookies(setCookieHeaders);
    }

    const statusCode = response.statusCode || 0;
    const body = response.body;

    return {
      ok: statusCode >= 200 && statusCode < 300,
      status: statusCode,
      statusText: response.statusMessage,
      headers: response.headers as Record<string, string | string[]>,
      body,
      text: async () => typeof body === 'string' ? body : JSON.stringify(body),
      json: async () => typeof body === 'object' ? body : JSON.parse(body as string),
    };
  }

  /**
   * Shorthand for GET requests
   */
  public async get<T>(endpoint: string): Promise<T> {
    return this.request<T>('GET', endpoint);
  }

  /**
   * Shorthand for POST requests
   */
  public async post<T>(endpoint: string, data?: unknown): Promise<T> {
    return this.request<T>('POST', endpoint, data);
  }

  /**
   * Shorthand for PUT requests
   */
  public async put<T>(endpoint: string, data?: unknown): Promise<T> {
    return this.request<T>('PUT', endpoint, data);
  }

  /**
   * Shorthand for DELETE requests
   */
  public async delete<T>(endpoint: string): Promise<T> {
    return this.request<T>('DELETE', endpoint);
  }

  /**
   * Shorthand for PATCH requests
   */
  public async patch<T>(endpoint: string, data?: unknown): Promise<T> {
    return this.request<T>('PATCH', endpoint, data);
  }
}