export interface SessionData {
  sessionId: string;
  caseData?: CaseData;
  accusedData?: AccusedData;
  evidence?: EvidenceItem[];
  questions?: any[];
  responses?: any[];
  notes?: any[];
  report?: any;
}
import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable, BehaviorSubject, of, throwError } from 'rxjs';
import { delay, tap, catchError } from 'rxjs/operators';
import { environment } from '../../environments/environment';
  // Request investigation questions based on Brief Description

export interface CaseData {
  caseId: string;
  caseType: string;
  crimeCategory: string;
  crimeSubtype: string;
  description: string;
  location: string;
  dateTime: string;
  urgency: string;
  officerName: string;
  badgeNumber: string;
  department: string;
  contactInfo: string;
}

export interface AccusedData {
  name: string;
  age: string;
  gender: string;
  address: string;
  occupation: string;
  contactNumber: string;
  relationship: string;
  background: string;
  previousRecords: string;
}

export interface EvidenceItem {
  type: string;
  description: string;
  location: string;
  collectedBy: string;
  dateCollected: string;
  chainOfCustody: string;
  significance: string;
}

@Injectable({
  providedIn: 'root'
})
export class PyDetectService {
  private baseUrl = environment.pyDetectApiUrl;
  private httpOptions = {
    headers: new HttpHeaders({
      'Content-Type': 'application/json'
    })
  };

  // Session management
  private currentSessionSubject = new BehaviorSubject<SessionData | null>(null);
  public currentSession$ = this.currentSessionSubject.asObservable();
  
  // Voice settings
  private voiceEnabledSubject = new BehaviorSubject<boolean>(true);
  public voiceEnabled$ = this.voiceEnabledSubject.asObservable();

  constructor(private http: HttpClient) {
    // Initialize voice settings from localStorage
    const savedVoiceEnabled = localStorage.getItem('pydetect_voice_enabled');
    if (savedVoiceEnabled !== null) {
      this.voiceEnabledSubject.next(JSON.parse(savedVoiceEnabled));
    }
  }

  // Request investigation questions based on Brief Description

  // ============ SESSION MANAGEMENT ============
  
  // Start a new session
  startSession(briefDescription?: string): Observable<any> {
  const payload: any = {};
  if (briefDescription) payload.brief_description = briefDescription;
    return this.http.post(`${this.baseUrl}/start_session`, payload, this.httpOptions)
      .pipe(
        tap(response => {
          const responseData = response as any;
          const sessionData: SessionData = {
            sessionId: responseData.session_id || this.generateSessionId(),
            caseData: undefined,
            accusedData: undefined,
            evidence: [],
            questions: [],
            responses: [],
            notes: [],
            report: undefined
          };
          this.currentSessionSubject.next(sessionData);
          this.saveSessionToStorage(sessionData);
        }),
        catchError(this.handleError)
      );
  }

  // Get current session
  getCurrentSession(): SessionData | null {
    return this.currentSessionSubject.value;
  }

  // Update session data
  updateSession(updates: Partial<SessionData>): void {
    const current = this.currentSessionSubject.value;
    if (current) {
      const updated = { ...current, ...updates };
      this.currentSessionSubject.next(updated);
      this.saveSessionToStorage(updated);
    }
  }

  // ============ CASE MANAGEMENT ============

  // Submit complete case details
  submitCaseDetails(sessionId: string, caseData: CaseData, briefDescription?: string): Observable<any> {
    const payload: any = {
      session_id: sessionId,
      case_data: caseData,
      timestamp: new Date().toISOString()
    };
    // ...existing code...
    return this.http.post(`${this.baseUrl}/submit_case`, payload, this.httpOptions)
      .pipe(
        tap(response => {
          this.updateSession({ caseData: caseData });
        }),
        catchError(this.handleError)
      );
  }

  // ============ BODY LANGUAGE EXPLANATION ============

  /**
   * Fetches body language explanation for a given cue from backend.
   * @param cue The body language cue to explain
   * @returns Observable<{ explanation: string }>
   */
  bodyLanguageExplain(cue: string): Observable<{ meaning?: string; explanation?: string }> {
    const payload = { cue };
    return this.http.post<{ meaning?: string; explanation?: string }>(`${this.baseUrl}/body_language_explain`, payload, this.httpOptions)
      .pipe(catchError((error): Observable<{ meaning?: string; explanation?: string }> => {
        let errorMessage = 'An unknown error occurred';
        if (error.error instanceof ErrorEvent) {
          errorMessage = `Client Error: ${error.error.message}`;
        } else {
          errorMessage = `Server Error: ${error.status} - ${error.message}`;
        }
        // Return an object with explanation only for error case
        return of({ explanation: errorMessage });
      }));
  }

  // Submit accused details
  submitAccused(sessionId: string, accused: AccusedData, additionalData?: any): Observable<any> {
    const currentSession = this.getCurrentSession();
    
    const payload = {
      session_id: sessionId,
      accused: accused,
      crime: additionalData?.crime || currentSession?.caseData?.crimeCategory || '',
      profile: currentSession?.caseData || additionalData?.profile || {},
      evidence: currentSession?.evidence || additionalData?.evidence || [],
      timestamp: new Date().toISOString(),
      ...additionalData
    };

    return this.http.post(`${this.baseUrl}/submit_accused`, payload, this.httpOptions)
      .pipe(
        tap(response => {
          this.updateSession({ accusedData: accused });
        }),
        catchError(this.handleError)
      );
  }

  // ============ EVIDENCE MANAGEMENT ============

  // Submit evidence
  submitEvidence(sessionId: string, evidence: EvidenceItem[]): Observable<any> {
    const payload = {
      session_id: sessionId,
      evidence: evidence.map(item => ({
        ...item,
        timestamp: new Date().toISOString(),
        evidence_id: this.generateEvidenceId()
      }))
    };

    return this.http.post(`${this.baseUrl}/submit_evidence`, payload, this.httpOptions)
      .pipe(
        tap(response => {
          const currentSession = this.getCurrentSession();
          const updatedEvidence = [...(currentSession?.evidence || []), ...evidence];
          this.updateSession({ evidence: updatedEvidence });
        }),
        catchError(this.handleError)
      );
  }

  // Add single evidence item
  addEvidenceItem(sessionId: string, evidenceItem: EvidenceItem): Observable<any> {
    return this.submitEvidence(sessionId, [evidenceItem]);
  }

  // ============ INVESTIGATION NOTES ============

  // Add investigation note
  addNote(sessionId: string, note: string, category: string = 'general'): Observable<any> {
    const noteData = {
      session_id: sessionId,
      note: note,
      timestamp: new Date().toISOString(),
      category: category,
      note_id: this.generateNoteId(),
      officer: this.getCurrentSession()?.caseData?.officerName || 'Unknown Officer'
    };

    return this.http.post(`${this.baseUrl}/add_note`, noteData, this.httpOptions)
      .pipe(
        tap(response => {
          const currentSession = this.getCurrentSession();
          const updatedNotes = [...(currentSession?.notes || []), noteData];
          this.updateSession({ notes: updatedNotes });
        }),
        catchError(this.handleError)
      );
  }

  // ============ AI QUESTIONING SYSTEM ============

  // Get context-aware AI questions
  askQuestion(sessionId: string, crimeType?: string, briefDescription?: string): Observable<any> {
  // ...existing code...
    const queryParams = [`session_id=${encodeURIComponent(sessionId)}`];
    // Always send crimeType, even if empty
    queryParams.push(`crime_type=${encodeURIComponent(crimeType ?? '')}`);
    // Always send briefDescription, even if empty
    queryParams.push(`brief_description=${encodeURIComponent(briefDescription ?? '')}`);
    const queryString = queryParams.join('&');
    return this.http.get(`${this.baseUrl}/ask_question?${queryString}`, this.httpOptions)
      .pipe(catchError(this.handleError));
  }

  // Submit response to AI question
  submitResponse(sessionId: string, text: string, questionId?: string, timing?: {
    answer_start_at?: number;
    answer_end_at?: number;
    duration_ms?: number;
    mode?: string;
  }): Observable<any> {
    const responseData: any = {
      session_id: sessionId,
      text: text,
      question_id: questionId,
      timestamp: new Date().toISOString(),
      response_id: this.generateResponseId()
    };
    if (timing) {
      if (timing.answer_start_at) responseData.answer_start_at = timing.answer_start_at;
      if (timing.answer_end_at) responseData.answer_end_at = timing.answer_end_at;
      if (typeof timing.duration_ms === 'number') responseData.duration_ms = timing.duration_ms;
      if (timing.mode) responseData.mode = timing.mode;
    }
    return this.http.post(`${this.baseUrl}/submit_response`, responseData, this.httpOptions)
      .pipe(
        tap(response => {
          const currentSession = this.getCurrentSession();
          const updatedResponses = [...(currentSession?.responses || []), responseData];
          this.updateSession({ responses: updatedResponses });
        }),
        catchError(this.handleError)
      );
  }

  // Stream a single face frame for nonverbal analysis
  faceFrame(sessionId: string, frameDataUrl: string): Observable<any> {
    const payload = { session_id: sessionId, frame: frameDataUrl };
    return this.http.post(`${this.baseUrl}/face_frame`, payload, this.httpOptions)
      .pipe(catchError(this.handleError));
  }

  // ============ REPORTING SYSTEM ============

  // Get comprehensive report
  getReport(sessionId: string, reportType: string = 'complete'): Observable<any> {
    return this.http.get(`${this.baseUrl}/get_report/${sessionId}?type=${reportType}`, this.httpOptions)
      .pipe(
        tap(response => {
          this.updateSession({ report: response });
        }),
        catchError(this.handleError)
      );
  }

  // Generate summary report
  generateSummary(sessionId: string): Observable<any> {
    const currentSession = this.getCurrentSession();
    const summaryData = {
      session_id: sessionId,
      case_data: currentSession?.caseData,
      accused_data: currentSession?.accusedData,
      evidence_count: currentSession?.evidence?.length || 0,
      questions_answered: currentSession?.responses?.length || 0,
      notes_count: currentSession?.notes?.length || 0,
      timestamp: new Date().toISOString()
    };

    return this.http.post(`${this.baseUrl}/generate_summary`, summaryData, this.httpOptions)
      .pipe(catchError(this.handleError));
  }

  // ============ VOICE FUNCTIONALITY ============

  // Toggle voice functionality
  toggleVoice(): void {
    const current = this.voiceEnabledSubject.value;
    this.voiceEnabledSubject.next(!current);
    localStorage.setItem('pydetect_voice_enabled', JSON.stringify(!current));
  }

  // Check if voice is enabled
  isVoiceEnabled(): boolean {
    return this.voiceEnabledSubject.value;
  }

  // ============ AUTHENTICATION ============

  // Sign in
  signIn(email: string, password: string): Observable<any> {
    return this.http.post(`${this.baseUrl}/sign-in`, {
      email: email,
      password: password
    }, this.httpOptions).pipe(catchError(this.handleError));
  }

  // Sign up
  signUp(name: string, email: string, password: string, role: string = 'investigator'): Observable<any> {
    return this.http.post(`${this.baseUrl}/sign-up`, {
      name: name,
      email: email,
      password: password,
      role: role
    }, this.httpOptions).pipe(catchError(this.handleError));
  }

  // Health check
  healthCheck(): Observable<any> {
    return this.http.get(`${this.baseUrl}/health`, this.httpOptions)
      .pipe(catchError(this.handleError));
  }

  // ============ UTILITY METHODS ============

  // Generate unique session ID
  private generateSessionId(): string {
    return 'session_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
  }

  // Generate unique evidence ID
  private generateEvidenceId(): string {
    return 'evidence_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
  }

  // Generate unique note ID
  private generateNoteId(): string {
    return 'note_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
  }

  // Generate unique response ID
  private generateResponseId(): string {
    return 'response_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
  }

  // Save session to localStorage
  private saveSessionToStorage(session: SessionData): void {
    try {
      localStorage.setItem('pydetect_current_session', JSON.stringify(session));
    } catch (error) {
    }
  }

  // Load session from localStorage
  loadSessionFromStorage(): SessionData | null {
    try {
      const stored = localStorage.getItem('pydetect_current_session');
      if (stored) {
        const session = JSON.parse(stored);
        this.currentSessionSubject.next(session);
        return session;
      }
    } catch (error) {
    }
    return null;
  }

  // Clear current session
  clearSession(): void {
    this.currentSessionSubject.next(null);
    localStorage.removeItem('pydetect_current_session');
  }

  // Error handling
  private handleError(error: any): Observable<never> {
    
    let errorMessage = 'An unknown error occurred';
    if (error.error instanceof ErrorEvent) {
      errorMessage = `Client Error: ${error.error.message}`;
    } else {
      errorMessage = `Server Error: ${error.status} - ${error.message}`;
    }
    
    return throwError(() => new Error(errorMessage));
  }

  // ============ DATA VALIDATION ============

  // Validate case data
  validateCaseData(caseData: Partial<CaseData>): { isValid: boolean; errors: string[] } {
    const errors: string[] = [];
    
    if (!caseData.caseId) errors.push('Case ID is required');
    if (!caseData.crimeCategory) errors.push('Crime category is required');
    if (!caseData.description) errors.push('Description is required');
    if (!caseData.officerName) errors.push('Officer name is required');
    if (!caseData.badgeNumber) errors.push('Badge number is required');
    
    return {
      isValid: errors.length === 0,
      errors: errors
    };
  }

  // Validate accused data
  validateAccusedData(accusedData: Partial<AccusedData>): { isValid: boolean; errors: string[] } {
    const errors: string[] = [];
    
    if (!accusedData.name) errors.push('Accused name is required');
    if (!accusedData.age) errors.push('Age is required');
    if (!accusedData.gender) errors.push('Gender is required');
    
    return {
      isValid: errors.length === 0,
      errors: errors
    };
  }

  // ============ STATISTICS & ANALYTICS ============

  // Get session statistics
  getSessionStats(): any {
    const session = this.getCurrentSession();
    if (!session) return null;

    return {
      sessionId: session.sessionId,
      questionsAnswered: session.responses?.length || 0,
      evidenceItems: session.evidence?.length || 0,
      notesAdded: session.notes?.length || 0,
      hasAccusedData: !!session.accusedData,
      hasCaseData: !!session.caseData,
      hasReport: !!session.report
    };
  }

  // Request investigation questions from backend
  getInvestigationQuestions(sessionId: string, crimeType: string, briefDescription: string): Observable<any> {
    return this.http.get(
      `${this.baseUrl}/ask_question?session_id=${sessionId}&crime_type=${encodeURIComponent(crimeType)}&brief_description=${encodeURIComponent(briefDescription)}`,
      this.httpOptions
    );
  }
}