import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { MatSnackBar } from '@angular/material/snack-bar';
import { ApiService } from '../services/api.service';
import { finalize } from 'rxjs/operators';

interface ProviderConfig {
  type: string;
  name: string;
  display_name: string;
  requires_endpoint: boolean;
  requires_api_key: boolean;
  requires_repo_info: boolean;
  description?: string;
}

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

@Component({
  selector: 'app-environment',
  templateUrl: './environment.component.html',
  styleUrls: ['./environment.component.scss']
})
export class EnvironmentComponent implements OnInit {
  environmentForm!: FormGroup;
  loading = false;
  saving = false;
  showInternalPrompt = false;
  showParameterCollection = false;
  
  // Provider lists
  allProviders: ProviderConfig[] = [];
  llmProviders: ProviderConfig[] = [];
  ttsProviders: ProviderConfig[] = [];
  sttProviders: ProviderConfig[] = [];
  
  // Current provider configs
  currentLLMProvider?: ProviderConfig;
  currentTTSProvider?: ProviderConfig;
  currentSTTProvider?: ProviderConfig;

  constructor(
    private fb: FormBuilder,
    private apiService: ApiService,
    private snackBar: MatSnackBar
  ) {}

  ngOnInit(): void {
    this.initializeForm();
    this.loadEnvironment();
  }

  initializeForm(): void {
    this.environmentForm = this.fb.group({
      // LLM Provider
      llm_provider_name: ['', Validators.required],
      llm_provider_api_key: [''],
      llm_provider_endpoint: [''],
      internal_prompt: [''],
      
      // Parameter Collection Config
      max_params_per_question: [2, [Validators.min(1), Validators.max(5)]],
      retry_unanswered: [true],
      collection_prompt: [''],
      
      // TTS Provider
      tts_provider_name: ['no_tts'],
      tts_provider_api_key: [''],
      tts_provider_endpoint: [''],
      tts_use_ssml: [false],
      
      // STT Provider
      stt_provider_name: ['no_stt'],
      stt_provider_api_key: [''],
      stt_provider_endpoint: [''],
      stt_speech_timeout_ms: [2000],
      stt_noise_reduction_level: [2],
      stt_vad_sensitivity: [0.5],
      stt_language: ['tr-TR'],
      stt_model: ['latest_long'],
      stt_use_enhanced: [true],
      stt_enable_punctuation: [true],
      stt_interim_results: [true]
    });

    // Subscribe to provider changes
    this.environmentForm.get('llm_provider_name')?.valueChanges.subscribe(name => {
      this.onLLMProviderChange(name);
    });
    
    this.environmentForm.get('tts_provider_name')?.valueChanges.subscribe(name => {
      this.onTTSProviderChange(name);
    });
    
    this.environmentForm.get('stt_provider_name')?.valueChanges.subscribe(name => {
      this.onSTTProviderChange(name);
    });
  }

  loadEnvironment(): void {
    this.loading = true;
    this.apiService.getEnvironment()
      .pipe(finalize(() => this.loading = false))
      .subscribe({
        next: (data) => {
          // Store providers
          this.allProviders = data.providers || [];
          this.llmProviders = this.allProviders.filter(p => p.type === 'llm');
          this.ttsProviders = [{
            type: 'tts',
            name: 'no_tts',
            display_name: 'No TTS',
            requires_endpoint: false,
            requires_api_key: false,
            requires_repo_info: false
          }, ...this.allProviders.filter(p => p.type === 'tts')];
          this.sttProviders = [{
            type: 'stt',
            name: 'no_stt',
            display_name: 'No STT',
            requires_endpoint: false,
            requires_api_key: false,
            requires_repo_info: false
          }, ...this.allProviders.filter(p => p.type === 'stt')];
          
          // Set form values
          this.environmentForm.patchValue({
            // LLM Provider
            llm_provider_name: data.llm_provider?.name || '',
            llm_provider_api_key: data.llm_provider?.api_key || '',
            llm_provider_endpoint: data.llm_provider?.endpoint || '',
            internal_prompt: data.llm_provider?.settings?.internal_prompt || '',
            
            // Parameter Collection
            max_params_per_question: data.llm_provider?.settings?.parameter_collection_config?.max_params_per_question || 2,
            retry_unanswered: data.llm_provider?.settings?.parameter_collection_config?.retry_unanswered ?? true,
            collection_prompt: data.llm_provider?.settings?.parameter_collection_config?.collection_prompt || '',
            
            // TTS Provider
            tts_provider_name: data.tts_provider?.name || 'no_tts',
            tts_provider_api_key: data.tts_provider?.api_key || '',
            tts_provider_endpoint: data.tts_provider?.endpoint || '',
            tts_use_ssml: data.tts_provider?.settings?.use_ssml || false,
            
            // STT Provider
            stt_provider_name: data.stt_provider?.name || 'no_stt',
            stt_provider_api_key: data.stt_provider?.api_key || '',
            stt_provider_endpoint: data.stt_provider?.endpoint || '',
            stt_speech_timeout_ms: data.stt_provider?.settings?.speech_timeout_ms || 2000,
            stt_noise_reduction_level: data.stt_provider?.settings?.noise_reduction_level || 2,
            stt_vad_sensitivity: data.stt_provider?.settings?.vad_sensitivity || 0.5,
            stt_language: data.stt_provider?.settings?.language || 'tr-TR',
            stt_model: data.stt_provider?.settings?.model || 'latest_long',
            stt_use_enhanced: data.stt_provider?.settings?.use_enhanced ?? true,
            stt_enable_punctuation: data.stt_provider?.settings?.enable_punctuation ?? true,
            stt_interim_results: data.stt_provider?.settings?.interim_results ?? true
          });
          
          // Trigger provider change handlers
          this.onLLMProviderChange(data.llm_provider?.name || '');
          this.onTTSProviderChange(data.tts_provider?.name || 'no_tts');
          this.onSTTProviderChange(data.stt_provider?.name || 'no_stt');
        },
        error: (error) => {
          this.snackBar.open('Failed to load environment configuration', 'Close', {
            duration: 3000,
            panelClass: ['error-snackbar']
          });
        }
      });
  }

  onLLMProviderChange(name: string): void {
    this.currentLLMProvider = this.llmProviders.find(p => p.name === name);
    
    if (this.currentLLMProvider) {
      // Update validators
      const apiKeyControl = this.environmentForm.get('llm_provider_api_key');
      const endpointControl = this.environmentForm.get('llm_provider_endpoint');
      
      if (this.currentLLMProvider.requires_api_key) {
        apiKeyControl?.setValidators([Validators.required]);
      } else {
        apiKeyControl?.clearValidators();
      }
      
      if (this.currentLLMProvider.requires_endpoint) {
        endpointControl?.setValidators([Validators.required, Validators.pattern('https?://.+')]);
      } else {
        endpointControl?.clearValidators();
      }
      
      apiKeyControl?.updateValueAndValidity();
      endpointControl?.updateValueAndValidity();
    }
  }

  onTTSProviderChange(name: string): void {
    this.currentTTSProvider = this.ttsProviders.find(p => p.name === name);
    
    if (this.currentTTSProvider) {
      const apiKeyControl = this.environmentForm.get('tts_provider_api_key');
      const endpointControl = this.environmentForm.get('tts_provider_endpoint');
      
      if (this.currentTTSProvider.requires_api_key && name !== 'no_tts') {
        apiKeyControl?.setValidators([Validators.required]);
      } else {
        apiKeyControl?.clearValidators();
      }
      
      if (this.currentTTSProvider.requires_endpoint && name !== 'no_tts') {
        endpointControl?.setValidators([Validators.required, Validators.pattern('https?://.+')]);
      } else {
        endpointControl?.clearValidators();
      }
      
      apiKeyControl?.updateValueAndValidity();
      endpointControl?.updateValueAndValidity();
    }
  }

  onSTTProviderChange(name: string): void {
    this.currentSTTProvider = this.sttProviders.find(p => p.name === name);
    
    if (this.currentSTTProvider) {
      const apiKeyControl = this.environmentForm.get('stt_provider_api_key');
      const endpointControl = this.environmentForm.get('stt_provider_endpoint');
      
      if (this.currentSTTProvider.requires_api_key && name !== 'no_stt') {
        apiKeyControl?.setValidators([Validators.required]);
      } else {
        apiKeyControl?.clearValidators();
      }
      
      if (this.currentSTTProvider.requires_endpoint && name !== 'no_stt') {
        endpointControl?.setValidators([Validators.required, Validators.pattern('https?://.+')]);
      } else {
        endpointControl?.clearValidators();
      }
      
      apiKeyControl?.updateValueAndValidity();
      endpointControl?.updateValueAndValidity();
    }
  }

  save(): void {
    if (this.environmentForm.invalid) {
      Object.keys(this.environmentForm.controls).forEach(key => {
        const control = this.environmentForm.get(key);
        if (control && control.invalid) {
          control.markAsTouched();
        }
      });
      return;
    }

    this.saving = true;
    const formValue = this.environmentForm.value;
    
    // Build environment update payload
    const payload = {
      llm_provider: {
        name: formValue.llm_provider_name,
        api_key: formValue.llm_provider_api_key || null,
        endpoint: formValue.llm_provider_endpoint || null,
        settings: {
          internal_prompt: formValue.internal_prompt || null,
          parameter_collection_config: {
            max_params_per_question: formValue.max_params_per_question,
            retry_unanswered: formValue.retry_unanswered,
            collection_prompt: formValue.collection_prompt || null
          }
        }
      },
      tts_provider: {
        name: formValue.tts_provider_name,
        api_key: formValue.tts_provider_api_key || null,
        endpoint: formValue.tts_provider_endpoint || null,
        settings: {
          use_ssml: formValue.tts_use_ssml
        }
      },
      stt_provider: {
        name: formValue.stt_provider_name,
        api_key: formValue.stt_provider_api_key || null,
        endpoint: formValue.stt_provider_endpoint || null,
        settings: {
          speech_timeout_ms: formValue.stt_speech_timeout_ms,
          noise_reduction_level: formValue.stt_noise_reduction_level,
          vad_sensitivity: formValue.stt_vad_sensitivity,
          language: formValue.stt_language,
          model: formValue.stt_model,
          use_enhanced: formValue.stt_use_enhanced,
          enable_punctuation: formValue.stt_enable_punctuation,
          interim_results: formValue.stt_interim_results
        }
      }
    };

    this.apiService.updateEnvironment(payload)
      .pipe(finalize(() => this.saving = false))
      .subscribe({
        next: () => {
          this.snackBar.open('Environment configuration saved successfully', 'Close', {
            duration: 3000,
            panelClass: ['success-snackbar']
          });
        },
        error: (error) => {
          this.snackBar.open(
            error.error?.detail || 'Failed to save environment configuration', 
            'Close', 
            {
              duration: 5000,
              panelClass: ['error-snackbar']
            }
          );
        }
      });
  }

  testConnection(): void {
    const endpoint = this.environmentForm.get('llm_provider_endpoint')?.value;
    const apiKey = this.environmentForm.get('llm_provider_api_key')?.value;
    const provider = this.environmentForm.get('llm_provider_name')?.value;
    
    if (!endpoint) {
      this.snackBar.open('Please enter an endpoint URL', 'Close', {
        duration: 3000,
        panelClass: ['error-snackbar']
      });
      return;
    }

    this.loading = true;
    this.apiService.testConnection({ endpoint, api_key: apiKey, provider })
      .pipe(finalize(() => this.loading = false))
      .subscribe({
        next: (result) => {
          if (result.success) {
            this.snackBar.open('Connection successful!', 'Close', {
              duration: 3000,
              panelClass: ['success-snackbar']
            });
          } else {
            this.snackBar.open(result.message || 'Connection failed', 'Close', {
              duration: 5000,
              panelClass: ['error-snackbar']
            });
          }
        },
        error: (error) => {
          this.snackBar.open('Connection test failed', 'Close', {
            duration: 3000,
            panelClass: ['error-snackbar']
          });
        }
      });
  }

  toggleInternalPrompt(): void {
    this.showInternalPrompt = !this.showInternalPrompt;
  }

  toggleParameterCollection(): void {
    this.showParameterCollection = !this.showParameterCollection;
  }

  isLLMEndpointRequired(): boolean {
    return this.currentLLMProvider?.requires_endpoint || false;
  }

  isLLMApiKeyRequired(): boolean {
    return this.currentLLMProvider?.requires_api_key || false;
  }

  isTTSEnabled(): boolean {
    return this.environmentForm.get('tts_provider_name')?.value !== 'no_tts';
  }

  isSTTEnabled(): boolean {
    return this.environmentForm.get('stt_provider_name')?.value !== 'no_stt';
  }

  getLLMProviderDescription(): string {
    return this.currentLLMProvider?.description || '';
  }

  getTTSProviderDescription(): string {
    return this.currentTTSProvider?.description || '';
  }

  getSTTProviderDescription(): string {
    return this.currentSTTProvider?.description || '';
  }
}