import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { catchError, tap } from 'rxjs/operators';
import { Router } from '@angular/router';
import { AuthService } from './auth.service';

// Interfaces
export interface API {
  name: string;
  url: string;
  method: string;
  headers?: any;
  body_template?: any;
  timeout_seconds: number;
  retry?: {
    retry_count: number;
    backoff_seconds: number;
    strategy: string;
  };
  auth?: {
    enabled: boolean;
    token_endpoint?: string;
    response_token_path?: string;
    token_request_body?: any;
    token_refresh_endpoint?: string;
    token_refresh_body?: any;
  };
  response_prompt?: string;
  response_mappings?: ResponseMapping[];  // Yeni alan
  deleted?: boolean;
  last_update_date?: string;
  last_update_user?: string;
}

export interface LocalizedCaption {
  locale_code: string;
  caption: string;
}

export interface LocalizedExample {
  locale_code: string;
  example: string;
}

export interface ResponseMapping {
  variable_name: string;
  type: 'str' | 'int' | 'float' | 'bool' | 'date';
  json_path: string;
  caption: LocalizedCaption[];
}

export interface IntentParameter {
  name: string;
  caption: LocalizedCaption[];
  type: 'str' | 'int' | 'float' | 'bool' | 'date';
  required: boolean;
  variable_name: string;
  extraction_prompt?: string;
  validation_regex?: string;
  invalid_prompt?: string;
  type_error_prompt?: string;
}

export interface Intent {
  name: string;
  caption: string;
  detection_prompt: string;
  examples: LocalizedExample[];
  parameters: IntentParameter[];
  action: string;
  fallback_timeout_prompt?: string;
  fallback_error_prompt?: string;
}

export interface GenerationConfig {
  max_new_tokens: number;
  temperature: number;
  top_p: number;
  top_k?: number;
  repetition_penalty?: number;
  do_sample?: boolean;
  num_beams?: number;
  length_penalty?: number;
  early_stopping?: boolean;
}

export interface LLMConfig {
  repo_id: string;
  generation_config: GenerationConfig;  // any yerine GenerationConfig
  use_fine_tune: boolean;
  fine_tune_zip: string;
}

export interface Version {
  no: number;
  caption?: string;
  description?: string;
  published: boolean;
  general_prompt?: string;
  llm: LLMConfig;  // inline yerine LLMConfig
  intents: Intent[];
  parameters: any[];
  last_update_date?: string;
}

export interface Project {
  id: number;
  name: string;
  caption: string;
  enabled: boolean;
  icon?: string;
  description?: string;
  default_locale?: string; 
  supported_locales?: string[]; 
  timezone?: string;
  region?: string;
  versions: Version[];
  last_update_date?: string;
  deleted?: boolean;
  created_date?: string;
  created_by?: string;
  last_update_user?: string;
}

export interface ParameterCollectionConfig {
  max_params_per_question: number;
  smart_grouping: boolean;
  retry_unanswered: boolean;
  collection_prompt: string;
}

export interface ProviderConfig {
  type: 'llm' | 'tts' | 'stt';
  name: string;
  display_name: string;
  requires_endpoint: boolean;
  requires_api_key: boolean;
  requires_repo_info?: boolean;
  description: string;
}

export interface ProviderSettings {
  name: string;
  api_key?: string;
  endpoint?: string | null;
  settings?: any;
}

export interface Environment {
  llm_provider: ProviderSettings;
  tts_provider: ProviderSettings;
  stt_provider: ProviderSettings;
  providers: ProviderConfig[];
  parameter_collection_config?: ParameterCollectionConfig;
}

export interface STTSettings {
  speech_timeout_ms: number;
  noise_reduction_level: number;
  vad_sensitivity: number;
  language: string;
  model: string;
  use_enhanced: boolean;
  enable_punctuation: boolean;
  interim_results: boolean;
}

export interface TTSSettings {
  use_ssml: boolean;
}

@Injectable({
  providedIn: 'root'
})
export class ApiService {
  private apiUrl = '/api';
  private adminUrl = `${this.apiUrl}/admin`;
  
  constructor(
    private http: HttpClient,
    private router: Router,
    private authService: AuthService
  ) {}

  // ===================== Utils =====================
  private normalizeTimestamp(timestamp: string | null | undefined): string {
    if (!timestamp) return '';
    
    // Remove milliseconds for comparison
    if (timestamp.includes('.') && timestamp.endsWith('Z')) {
      return timestamp.split('.')[0] + 'Z';
    }
    
    return timestamp;
  }
  
  // ===================== Auth =====================
  login(username: string, password: string): Observable<any> {
    return this.http.post(`${this.adminUrl}/login`, { username, password }).pipe(
      tap((response: any) => {
        this.authService.setToken(response.token);
        this.authService.setUsername(response.username);
      })
    );
  }

  logout(): void {
    this.authService.logout();
  }

  private getAuthHeaders(): HttpHeaders {
    try {
      const token = this.authService.getToken();
      if (!token) {
        console.warn('No auth token available');
        // Token yoksa boş header dön veya login'e yönlendir
        return new HttpHeaders({
          'Content-Type': 'application/json'
        });
      }
      
      return new HttpHeaders({
        'Authorization': `Bearer ${token}`,
        'Content-Type': 'application/json'
      });
    } catch (error) {
      console.error('Error getting auth headers:', error);
      return new HttpHeaders({
        'Content-Type': 'application/json'
      });
    }
  }

  // ===================== User =====================
  changePassword(currentPassword: string, newPassword: string): Observable<any> {
    return this.http.post(
      `${this.adminUrl}/change-password`,
      { current_password: currentPassword, new_password: newPassword },
      { headers: this.getAuthHeaders() }
    ).pipe(
      catchError(this.handleError)
    );
  }

  // ===================== Environment =====================
   getEnvironment(): Observable<any> {
    return this.http.get(`${this.adminUrl}/environment`, {
      headers: this.getAuthHeaders()
    });
  }

  updateEnvironment(data: Environment): Observable<any> {
    return this.http.put(`${this.adminUrl}/environment`, data, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  // ===================== Projects =====================
  getProjects(includeDeleted = false): Observable<Project[]> {
    return this.http.get<Project[]>(`${this.adminUrl}/projects`, {
      headers: this.getAuthHeaders(),
      params: { include_deleted: includeDeleted.toString() }
    }).pipe(
      catchError(error => {
        // Race condition check
        if (error.status === 409) {
          console.warn('Race condition detected in getProjects:', error.error);
          // Component'ler bu hatayı handle edecek
        }
        return throwError(() => error);
      })
    );
  }

  getProject(id: number): Observable<Project> {
    return this.http.get<Project>(`${this.adminUrl}/projects/${id}`);
  }
  
  createProject(data: any): Observable<any> {
    console.log('createProject called with data:', data);
    
    let headers;
    try {
      headers = this.getAuthHeaders();
      console.log('Headers obtained successfully');
    } catch (error) {
      console.error('Error getting headers:', error);
      return throwError(() => ({ message: 'Authentication error' }));
    }
    
    console.log('Making POST request to:', `${this.adminUrl}/projects`);
    
    return this.http.post(`${this.adminUrl}/projects`, data, { headers }).pipe(
      tap(response => {
        console.log('Project creation successful:', response);
      }),
      catchError(error => {
        console.error('Project creation failed:', error);
        return this.handleError(error);
      })
    );
  }

  updateProject(id: number, data: any): Observable<any> {
    // Normalize the timestamp before sending
    if (data.last_update_date) {
      data.last_update_date = this.normalizeTimestamp(data.last_update_date);
    }
    
    return this.http.put(`${this.adminUrl}/projects/${id}`, data, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(error => {
        // Race condition özel handling
        if (error.status === 409) {
          const details = error.error?.details || {};
          return throwError(() => ({
            ...error,
            raceCondition: true,
            lastUpdateUser: details.last_update_user,
            lastUpdateDate: details.last_update_date
          }));
        }
        return throwError(() => error);
      })
    );
  }

  deleteProject(id: number): Observable<any> {
    return this.http.delete(`${this.adminUrl}/projects/${id}`, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  toggleProject(id: number): Observable<any> {
    return this.http.patch(`${this.adminUrl}/projects/${id}/toggle`, {}, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  exportProject(id: number): Observable<any> {
    return this.http.get(`${this.adminUrl}/projects/${id}/export`, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  importProject(data: any): Observable<any> {
    return this.http.post(`${this.adminUrl}/projects/import`, data, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  // ===================== Versions =====================
  createVersion(projectId: number, data: any): Observable<any> {
    return this.http.post(`${this.adminUrl}/projects/${projectId}/versions`, data, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(error => {
        if (error.status === 409) {
          console.warn('Race condition in createVersion:', error.error);
        }
        return throwError(() => error);
      })
    );
  }

  updateVersion(projectId: number, versionNo: number, data: any, force: boolean = false): Observable<any> {
    // Normalize the timestamp before sending
    if (data.last_update_date) {
      data.last_update_date = this.normalizeTimestamp(data.last_update_date);
    }

    return this.http.put(
      `${this.adminUrl}/projects/${projectId}/versions/${versionNo}${force ? '?force=true' : ''}`, 
      data, 
      { headers: this.getAuthHeaders() }
    ).pipe(
      catchError(this.handleError)
    );
  }

  deleteVersion(projectId: number, versionNo: number): Observable<any> {
    return this.http.delete(`${this.adminUrl}/projects/${projectId}/versions/${versionNo}`, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  publishVersion(projectId: number, versionNo: number): Observable<any> {
    return this.http.post(`${this.adminUrl}/projects/${projectId}/versions/${versionNo}/publish`, {}, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  // ===================== APIs =====================
  getAPIs(includeDeleted = false): Observable<API[]> {
    return this.http.get<API[]>(`${this.adminUrl}/apis`, {
      headers: this.getAuthHeaders(),
      params: { include_deleted: includeDeleted.toString() }
    }).pipe(
      catchError(this.handleError)
    );
  }

  createAPI(data: any): Observable<any> {
    return this.http.post(`${this.adminUrl}/apis`, data, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  updateAPI(name: string, data: any): Observable<any> {
    // Normalize the timestamp before sending
    if (data.last_update_date) {
      data.last_update_date = this.normalizeTimestamp(data.last_update_date);
    }

    return this.http.put(`${this.adminUrl}/apis/${name}`, data, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(error => {
        if (error.status === 409) {
          const details = error.error?.details || {};
          return throwError(() => ({
            ...error,
            raceCondition: true,
            lastUpdateUser: details.last_update_user,
            lastUpdateDate: details.last_update_date
          }));
        }
        return throwError(() => error);
      })
    );
  }
  deleteAPI(name: string): Observable<any> {
    return this.http.delete(`${this.adminUrl}/apis/${name}`, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  testAPI(data: any): Observable<any> {
    return this.http.post(`${this.adminUrl}/apis/test`, data, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  // ===================== Spark Integration =====================
  sparkStartup(projectName: string): Observable<any> {
    return this.http.post(`${this.adminUrl}/spark/startup`, 
      { project_name: projectName }, 
      { headers: this.getAuthHeaders() }
    ).pipe(
      catchError(this.handleError)
    );
  }
  
  sparkGetProjects(): Observable<any> {
    return this.http.get(`${this.adminUrl}/spark/projects`, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }
  
  sparkEnableProject(projectName: string): Observable<any> {
    return this.http.post(`${this.adminUrl}/spark/project/enable`, 
      { project_name: projectName }, 
      { headers: this.getAuthHeaders() }
    ).pipe(
      catchError(this.handleError)
    );
  }
  
  sparkDisableProject(projectName: string): Observable<any> {
    return this.http.post(`${this.adminUrl}/spark/project/disable`, 
      { project_name: projectName }, 
      { headers: this.getAuthHeaders() }
    ).pipe(
      catchError(this.handleError)
    );
  }
  
  sparkDeleteProject(projectName: string): Observable<any> {
    return this.http.delete(`${this.adminUrl}/spark/project/${projectName}`, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }
  
  // ===================== Tests =====================
  runTests(testType: string): Observable<any> {
    return this.http.post(`${this.adminUrl}/test/run-all`, { test_type: testType }, {
      headers: this.getAuthHeaders()
    }).pipe(
      catchError(this.handleError)
    );
  }

  // ===================== Activity Log =====================
  getActivityLog(limit = 50): Observable<any[]> {
    return this.http.get<any[]>(`${this.adminUrl}/activity-log`, {
      headers: this.getAuthHeaders(),
      params: { limit: limit.toString() }
    }).pipe(
      catchError(this.handleError)
    );
  }

  // ===================== Validation =====================
  validateRegex(pattern: string, testValue: string): Observable<any> {
    return this.http.post(`${this.adminUrl}/validate/regex`, 
      { pattern, test_value: testValue }, 
      { headers: this.getAuthHeaders() }
    ).pipe(
      catchError(this.handleError)
    );
  }

  // ===================== Chat =====================
  /* 1️⃣  Proje isimleri (combo’yu doldurmak için) */
  getChatProjects() {
    return this.http.get<string[]>(`${this.adminUrl}/projects/names`);
  }

  /* 2️⃣  Oturum başlat */
  startChat(projectName: string, isRealtime: boolean, locale?: string) {
    return this.http.post<{
      session_id: string;
      answer: string;
    }>(`${this.apiUrl}/start_session`, { 
      project_name: projectName,
      is_realtime: isRealtime,
      locale: locale || 'tr'
    });
  }

  /* 3️⃣  Mesaj gönder/al */
  chat(sessionId: string, text: string) {
    const headers = new HttpHeaders().set('X-Session-ID', sessionId);
    return this.http.post<{
      response: string;
      intent?: string;
      state: string;
    }>(
      `${this.apiUrl}/chat`,
      { message: text },
      { headers }
    );
  }

  endSession(sessionId: string): Observable<any> {
    return this.http.post(`${this.apiUrl}/end-session`, 
      { session_id: sessionId },
      { headers: this.getAuthHeaders() }
    );
  }  

  // ===================== TTS =====================
  generateTTS(text: string, voiceId?: string, modelId?: string, outputFormat: string = 'mp3_44100_128'): Observable<Blob> {
    const body = {
      text,
      voice_id: voiceId,
      model_id: modelId,
      output_format: outputFormat
    };

    return this.http.post(`${this.apiUrl}/tts/generate`, body, {
      headers: this.getAuthHeaders(),
      responseType: 'blob'
    }).pipe(
      catchError(this.handleError)
    );
  }

  // ===================== Locale =====================
  getAvailableLocales(): Observable<any> {
    return this.http.get(`${this.adminUrl}/locales`, { headers: this.getAuthHeaders() });
  }
  
  getLocaleDetails(code: string): Observable<any> {
    return this.http.get(`${this.adminUrl}/locales/${code}`, { headers: this.getAuthHeaders() });
  }
  
  // ===================== Error Handler =====================
  private handleError(error: any) {
    console.error('API Error:', error);
    
    if (error.status === 401) {
      // Token expired or invalid
      this.authService.logout();
    } else if (error.status === 409) {
      // Race condition error
      const message = error.error?.detail || 'Resource was modified by another user';
      
      return throwError(() => ({
        ...error,
        userMessage: message,
        requiresReload: true
      }));
    }
    
    // Ensure error object has proper structure
    const errorResponse = {
      status: error.status,
      error: error.error || { detail: error.message || 'Unknown error' },
      message: error.error?.detail || error.error?.message || error.message || 'Unknown error'
    };
    
    return throwError(() => errorResponse);
  }
}