import { Component, Inject, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormBuilder, FormGroup, FormArray, Validators, ReactiveFormsModule, FormsModule } from '@angular/forms';
import { MatDialogRef, MAT_DIALOG_DATA, MatDialogModule } from '@angular/material/dialog';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatSelectModule } from '@angular/material/select';
import { MatCheckboxModule } from '@angular/material/checkbox';
import { MatButtonModule } from '@angular/material/button';
import { MatIconModule } from '@angular/material/icon';
import { MatChipsModule } from '@angular/material/chips';
import { MatTableModule } from '@angular/material/table';
import { MatTabsModule } from '@angular/material/tabs';
import { MatExpansionModule } from '@angular/material/expansion';
import { MatListModule } from '@angular/material/list';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatDialog } from '@angular/material/dialog';

// Interfaces for multi-language support
interface LocalizedExample {
  locale_code: string;
  example: string;
}

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

interface ParameterWithLocalizedCaption {
  name: string;
  caption: LocalizedCaption[];
  type: string;
  required: boolean;
  variable_name: string;
  extraction_prompt?: string;
  validation_regex?: string;
  invalid_prompt?: string;
  type_error_prompt?: string;
}

@Component({
  selector: 'app-intent-edit-dialog',
  standalone: true,
  imports: [
    CommonModule,
    ReactiveFormsModule,
    FormsModule,
    MatDialogModule,
    MatFormFieldModule,
    MatInputModule,
    MatSelectModule,
    MatCheckboxModule,
    MatButtonModule,
    MatIconModule,
    MatChipsModule,
    MatTableModule,
    MatTabsModule,
    MatExpansionModule,
    MatListModule,
    MatSnackBarModule
  ],
  templateUrl: './intent-edit-dialog.component.html',
  styleUrls: ['./intent-edit-dialog.component.scss']
})
export default class IntentEditDialogComponent implements OnInit {
  form!: FormGroup;
  availableAPIs: any[] = [];
  parameterTypes = ['str', 'int', 'float', 'bool', 'date'];
  
  // Multi-language support
  supportedLocales: string[] = [];
  selectedExampleLocale: string = '';
  examples: LocalizedExample[] = [];
  
  newExample = '';

  constructor(
    private fb: FormBuilder,
    private snackBar: MatSnackBar,
    private dialog: MatDialog,
    public dialogRef: MatDialogRef<IntentEditDialogComponent>,
    @Inject(MAT_DIALOG_DATA) public data: any
  ) {
    this.availableAPIs = data.apis || [];
    this.supportedLocales = data.project?.supported_locales || data.supportedLocales || ['tr'];
    this.selectedExampleLocale = data.project?.default_locale || data.defaultLocale || this.supportedLocales[0] || 'tr';
  }

  ngOnInit() {
    this.initializeForm();
    if (this.data.intent) {
      this.populateForm(this.data.intent);
    }
  }

  initializeForm() {
    this.form = this.fb.group({
      name: ['', [Validators.required, Validators.pattern(/^[a-zA-Z0-9-]+$/)]],
      caption: ['', Validators.required],
      detection_prompt: ['', Validators.required],
      parameters: this.fb.array([]),
      action: ['', Validators.required],
      fallback_timeout_prompt: [''],
      fallback_error_prompt: ['']
    });
  }

  populateForm(intent: any) {
    // Populate basic fields
    this.form.patchValue({
      name: intent.name || '',
      caption: intent.caption || '',
      detection_prompt: intent.detection_prompt || '',
      action: intent.action || '',
      fallback_timeout_prompt: intent.fallback_timeout_prompt || '',
      fallback_error_prompt: intent.fallback_error_prompt || ''
    });

    // Populate localized examples
    if (intent.examples && Array.isArray(intent.examples)) {
      if (intent.examples.length > 0 && typeof intent.examples[0] === 'object' && 'locale_code' in intent.examples[0]) {
        // New format with LocalizedExample
        this.examples = [...intent.examples];
      } else if (typeof intent.examples[0] === 'string') {
        // Old format - convert to new format using default locale
        this.examples = intent.examples.map((ex: string) => ({
          locale_code: this.selectedExampleLocale,
          example: ex
        }));
      }
    }

    // Populate parameters with localized captions
    if (intent.parameters && Array.isArray(intent.parameters)) {
      const paramsArray = this.form.get('parameters') as FormArray;
      paramsArray.clear();
      
      intent.parameters.forEach((param: any) => {
        paramsArray.push(this.createParameterFormGroup(param));
      });
    }
  }

  createParameterFormGroup(param?: any): FormGroup {
    // Convert old caption format to new if needed
    let captionArray: LocalizedCaption[] = [];
    if (param?.caption) {
      if (Array.isArray(param.caption)) {
        captionArray = param.caption;
      } else if (typeof param.caption === 'string') {
        // Old format - convert to new
        captionArray = [{
          locale_code: this.selectedExampleLocale,
          caption: param.caption
        }];
      }
    }

    return this.fb.group({
      name: [param?.name || '', Validators.required],
      caption: [captionArray],
      type: [param?.type || 'str', Validators.required],
      required: [param?.required !== false],
      variable_name: [param?.variable_name || '', Validators.required],
      extraction_prompt: [param?.extraction_prompt || ''],
      validation_regex: [param?.validation_regex || ''],
      invalid_prompt: [param?.invalid_prompt || ''],
      type_error_prompt: [param?.type_error_prompt || '']
    });
  }

  get parameters() {
    return this.form.get('parameters') as FormArray;
  }

  addParameter() {
    this.parameters.push(this.createParameterFormGroup());
  }

  removeParameter(index: number) {
    this.parameters.removeAt(index);
  }

  // Multi-language example management
  getExamplesForCurrentLocale(): LocalizedExample[] {
    return this.examples.filter(ex => ex.locale_code === this.selectedExampleLocale);
  }

  addExample() {
    if (this.newExample.trim()) {
      const existingIndex = this.examples.findIndex(
        ex => ex.locale_code === this.selectedExampleLocale && ex.example === this.newExample.trim()
      );
      
      if (existingIndex === -1) {
        this.examples.push({
          locale_code: this.selectedExampleLocale,
          example: this.newExample.trim()
        });
        this.newExample = '';
      } else {
        this.snackBar.open('This example already exists for this locale', 'Close', { duration: 3000 });
      }
    }
  }

  removeExample(example: LocalizedExample) {
    const index = this.examples.findIndex(
      ex => ex.locale_code === example.locale_code && ex.example === example.example
    );
    if (index !== -1) {
      this.examples.splice(index, 1);
    }
  }

  // Test regex functionality
  testRegex(paramIndex: number) {
    const param = this.parameters.at(paramIndex);
    const regex = param.get('validation_regex')?.value;
    
    if (!regex) {
      this.snackBar.open('No regex pattern to test', 'Close', { duration: 2000 });
      return;
    }

    // Simple test implementation
    const testValue = prompt('Enter a test value:');
    if (testValue !== null) {
      try {
        const pattern = new RegExp(regex);
        const matches = pattern.test(testValue);
        this.snackBar.open(
          matches ? '✓ Pattern matches!' : '✗ Pattern does not match',
          'Close',
          { duration: 3000 }
        );
      } catch (e) {
        this.snackBar.open('Invalid regex pattern', 'Close', { duration: 3000 });
      }
    }
  }

  // Move parameter up or down
  moveParameter(index: number, direction: 'up' | 'down') {
    const newIndex = direction === 'up' ? index - 1 : index + 1;
    
    if (newIndex < 0 || newIndex >= this.parameters.length) {
      return;
    }

    const currentItem = this.parameters.at(index);
    this.parameters.removeAt(index);
    this.parameters.insert(newIndex, currentItem);
  }

  // Parameter caption management
  getCaptionDisplay(captions: LocalizedCaption[]): string {
    if (!captions || captions.length === 0) return '(No caption)';
    
    // Try to find caption for default locale
    const defaultCaption = captions.find(c => c.locale_code === (this.data.project?.default_locale || this.data.defaultLocale || 'tr'));
    if (defaultCaption) return defaultCaption.caption;
    
    // Return first available caption
    return captions[0].caption;
  }

  async openCaptionDialog(paramIndex: number) {
    const param = this.parameters.at(paramIndex);
    const currentCaptions = param.get('caption')?.value || [];
    
    // Import and open caption dialog
    const { default: CaptionDialogComponent } = await import('../caption-dialog/caption-dialog.component');
    
    const dialogRef = this.dialog.open(CaptionDialogComponent, {
      width: '600px',
      data: {
        captions: [...currentCaptions],
        supportedLocales: this.supportedLocales,
        defaultLocale: this.data.project?.default_locale || this.data.defaultLocale
      }
    });

    dialogRef.afterClosed().subscribe(result => {
      if (result) {
        param.patchValue({ caption: result });
      }
    });
  }

  // Locale helpers
  getLocaleName(localeCode: string): string {
    const localeNames: { [key: string]: string } = {
      'tr': 'Türkçe',
      'en': 'English',
      'de': 'Deutsch',
      'fr': 'Français',
      'es': 'Español',
      'ar': 'العربية',
      'ru': 'Русский',
      'zh': '中文',
      'ja': '日本語',
      'ko': '한국어'
    };
    return localeNames[localeCode] || localeCode;
  }

  onSubmit() {
    if (this.form.valid) {
      const formValue = this.form.value;
      
      // Add examples to the result
      formValue.examples = this.examples;
      
      // Ensure all parameters have captions
      formValue.parameters = formValue.parameters.map((param: any) => {
        if (!param.caption || param.caption.length === 0) {
          // Create default caption if missing
          param.caption = [{
            locale_code: this.data.project?.default_locale || this.data.defaultLocale || 'tr',
            caption: param.name
          }];
        }
        return param;
      });
      
      this.dialogRef.close(formValue);
    } else {
      this.snackBar.open('Please fill all required fields', 'Close', { duration: 3000 });
    }
  }

  save() {
    this.onSubmit();
  }

  cancel() {
    this.dialogRef.close();
  }
}