// project-edit-dialog.component.ts
import { Component, Inject, OnInit, OnDestroy } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormBuilder, FormGroup, Validators, ReactiveFormsModule, FormArray } 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 { MatDividerModule } from '@angular/material/divider';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
import { ApiService } from '../../services/api.service';
import { LocaleManagerService, Locale } from '../../services/locale-manager.service';
import { Subject, takeUntil } from 'rxjs';
import { HttpErrorResponse } from '@angular/common/http';

export interface ProjectDialogData {
  mode: 'create' | 'edit';
  project?: any;
}

@Component({
  selector: 'app-project-edit-dialog',
  standalone: true,
  imports: [
    CommonModule,
    ReactiveFormsModule,
    MatDialogModule,
    MatFormFieldModule,
    MatInputModule,
    MatSelectModule,
    MatCheckboxModule,
    MatButtonModule,
    MatIconModule,
    MatChipsModule,
    MatDividerModule,
    MatSnackBarModule,
    MatProgressSpinnerModule
  ],
  template: `
    <h2 mat-dialog-title>{{ data.mode === 'create' ? 'Create New Project' : 'Edit Project' }}</h2>
    
    <mat-dialog-content>
      <form [formGroup]="form">
        <mat-form-field appearance="outline" class="full-width">
          <mat-label>Name*</mat-label>
          <input matInput formControlName="name" 
                 [readonly]="data.mode === 'edit'"
                 placeholder="e.g., airline_agent">
          <mat-hint>Use only letters, numbers, and underscores</mat-hint>
          <mat-error>{{ getErrorMessage('name') }}</mat-error>
        </mat-form-field>

        <mat-form-field appearance="outline" class="full-width">
          <mat-label>Caption*</mat-label>
          <input matInput formControlName="caption" 
                 placeholder="e.g., Airline Customer Service Agent">
          <mat-error>{{ getErrorMessage('caption') }}</mat-error>
        </mat-form-field>

        <mat-form-field appearance="outline" class="full-width">
          <mat-label>Icon</mat-label>
          <mat-select formControlName="icon">
            @for (icon of projectIcons; track icon) {
              <mat-option [value]="icon">
                <mat-icon>{{ icon }}</mat-icon>
                {{ icon }}
              </mat-option>
            }
          </mat-select>
        </mat-form-field>

        <mat-form-field appearance="outline" class="full-width">
          <mat-label>Description</mat-label>
          <textarea matInput formControlName="description" rows="3"></textarea>
        </mat-form-field>

        <!-- Default Locale -->
        <mat-form-field appearance="outline" class="full-width">
          <mat-label>Default Locale</mat-label>
          <mat-select 
            formControlName="defaultLocale"
            (selectionChange)="onDefaultLocaleChange()">
            @if (loadingLocales) {
              <mat-option disabled>
                <mat-spinner diameter="20"></mat-spinner>
                Loading Locales...
              </mat-option>
            }
            @for (locale of availableLocales; track locale.code) {
              <mat-option [value]="locale.code">  <!-- locale.name yerine locale.code -->
                {{ locale.name }}
                <span class="locale-code">{{ locale.code }}</span>
              </mat-option>
            }
          </mat-select>
          <mat-icon matPrefix>translate</mat-icon>
          <mat-hint>Primary Locale for this project</mat-hint>
        </mat-form-field>

        <!-- Supported Locales -->
        <mat-form-field appearance="outline" class="full-width">
          <mat-label>Supported Locales</mat-label>
          <mat-select 
            formControlName="supportedLocales" 
            (selectionChange)="onSupportedLocalesChange()"
            multiple>
            <mat-select-trigger>
              <div class="selected-locales">
                @for (lang of form.get('supportedLocales')?.value || []; track lang; let last = $last) {
                  <span>{{ getLocaleName(lang) }}@if (!last) {, }</span>
                }
              </div>
            </mat-select-trigger>
            @for (locale of availableLocales; track locale.code) {
              <mat-option [value]="locale.code">
                {{ locale.name }}
                <span class="locale-code">{{ locale.code }}</span>
              </mat-option>
            }
          </mat-select>
          <mat-icon matPrefix>locale</mat-icon>
          <mat-hint>Locales available in this project</mat-hint>
        </mat-form-field>

        <mat-form-field appearance="outline" class="full-width">
          <mat-label>Timezone</mat-label>
          <mat-select formControlName="timezone">
            @for (tz of timezones; track tz) {
              <mat-option [value]="tz">{{ tz }}</mat-option>
            }
          </mat-select>
        </mat-form-field>

        <mat-form-field appearance="outline" class="full-width">
          <mat-label>Region</mat-label>
          <input matInput formControlName="region" placeholder="e.g., tr-TR">
        </mat-form-field>
      </form>
    </mat-dialog-content>
    
    <mat-dialog-actions align="end">
      <button mat-button (click)="close()">Cancel</button>
      <button mat-raised-button color="primary" 
              (click)="save()" 
              [disabled]="form.invalid || saving">
        {{ saving ? 'Saving...' : (data.mode === 'create' ? 'Create' : 'Save') }}
      </button>
    </mat-dialog-actions>
  `,
  styleUrls: ['./project-edit-dialog.component.scss']
})
export default class ProjectEditDialogComponent implements OnInit, OnDestroy {
  form!: FormGroup;
  saving = false;
  loadingLocales = true;
  availableLocales: Locale[] = [];
  
  // Memory leak prevention
  private destroyed$ = new Subject<void>();
  
  projectIcons = ['folder', 'work', 'shopping_cart', 'school', 'local_hospital', 'restaurant', 'home', 'business'];
  
  timezones = [
    'Europe/Istanbul',
    'Europe/London',
    'Europe/Berlin',
    'America/New_York',
    'America/Los_Angeles',
    'Asia/Tokyo'
  ];

  constructor(
    private fb: FormBuilder,
    private apiService: ApiService,
    private localeManager: LocaleManagerService,
    private snackBar: MatSnackBar,
    public dialogRef: MatDialogRef<ProjectEditDialogComponent>,
    @Inject(MAT_DIALOG_DATA) public data: ProjectDialogData
  ) {}

  ngOnInit() {
    this.initializeForm();
    this.loadAvailableLocales();
  }

  ngOnDestroy() {
    this.destroyed$.next();
    this.destroyed$.complete();
  }

  initializeForm() {
    const defaultValues = this.data.mode === 'edit' && this.data.project ? {
      name: this.data.project.name,
      caption: this.data.project.caption || '',
      icon: this.data.project.icon || 'folder',
      description: this.data.project.description || '',
      defaultLocale: this.data.project.default_locale || 'tr',
      supportedLocales: this.data.project.supported_locales || ['tr'],  // Düzeltildi: supportedLolcales -> supportedLocales
      timezone: this.data.project.timezone || 'Europe/Istanbul',
      region: this.data.project.region || 'tr-TR'
    } : {
      name: '',
      caption: '',
      icon: 'folder',
      description: '',
      defaultLocale: 'tr',
      supportedLocales: ['tr'],
      timezone: 'Europe/Istanbul',
      region: 'tr-TR'
    };
  
    this.form = this.fb.group({
      name: [defaultValues.name, [Validators.required, Validators.pattern(/^[a-z0-9_]+$/)]],
      caption: [defaultValues.caption, Validators.required],
      icon: [defaultValues.icon],
      description: [defaultValues.description],
      defaultLocale: [defaultValues.defaultLocale],
      supportedLocales: [defaultValues.supportedLocales],
      timezone: [defaultValues.timezone],
      region: [defaultValues.region]
    });
  
    // Disable name field in edit mode
    if (this.data.mode === 'edit') {
      this.form.get('name')?.disable();
    }
  }

  loadAvailableLocales() {
    this.loadingLocales = true;
    this.localeManager.getAvailableLocales()
      .pipe(takeUntil(this.destroyed$))
      .subscribe({
        next: (locales) => {
          this.availableLocales = locales;
          this.loadingLocales = false;
          this.validateSelectedLocales();
        },
        error: (err) => {
          this.showMessage('Failed to load available locales', 'error');
          this.loadingLocales = false;
          // Use fallback locales
          this.availableLocales = [
            { code: 'tr', name: 'Türkçe', english_name: 'Turkish' },
            { code: 'en', name: 'English', english_name: 'English' }
          ];
        }
      });
  }

  validateSelectedLocales() {
    const availableCodes = this.availableLocales.map(l => l.code);
    const currentSupported = this.form.get('supportedLocales')?.value || [];
    const currentDefault = this.form.get('defaultLocale')?.value;
    
    // Filter out any unsupported Locales
    const validSupported = currentSupported.filter((lang: string) => 
      availableCodes.includes(lang)
    );
    
    // Update form if any Locales were removed
    if (validSupported.length !== currentSupported.length) {
      this.form.patchValue({ supportedLocales: validSupported });
    }
    
    // Ensure default Locale is valid
    if (!availableCodes.includes(currentDefault)) {
      const newDefault = availableCodes[0] || 'tr-TR';
      this.form.patchValue({ 
        defaultLocale: newDefault,
        supportedLocales: [...validSupported, newDefault]
      });
    }
  }

  onDefaultLocaleChange() {
    // Default Locale değiştiğinde bir şey yapmaya gerek yok
    // Çünkü default_locale (Türkçe) ve supported_locales (tr-TR) farklı tipte
  }

  onSupportedLocalesChange() {
    // Supported locales değiştiğinde de bir şey yapmaya gerek yok
    // En az bir dil seçili olduğu sürece sorun yok
    const supportedLocales = this.form.get('supportedLocales')?.value || [];
    if (supportedLocales.length === 0) {
      // En az bir dil seçilmeli
      this.form.patchValue({
        supportedLocales: ['tr-TR']
      });
    }
  }

  getLocaleName(code: string): string {
    // Önce availableLocales'da ara
    const locale = this.availableLocales.find(l => l.code === code);
    if (locale) {
      return locale.name;
    }
    
    // Bulamazsan fallback locale isimleri kullan
    const localeNames: { [key: string]: string } = {
      'tr': 'Türkçe',
      'tr-TR': 'Türkçe',
      'en': 'English',
      'en-US': 'English',
      'en-GB': 'English (UK)',
      'de': 'Deutsch',
      'de-DE': 'Deutsch',
      'fr': 'Français',
      'fr-FR': 'Français',
      'es': 'Español',
      'es-ES': 'Español',
      'ar': 'العربية',
      'ar-SA': 'العربية',
      'ru': 'Русский',
      'ru-RU': 'Русский',
      'zh': '中文',
      'zh-CN': '中文',
      'ja': '日本語',
      'ja-JP': '日本語',
      'ko': '한국어',
      'ko-KR': '한국어'
    };
    
    return localeNames[code] || code;
  }

  getErrorMessage(fieldName: string): string {
    const control = this.form.get(fieldName);
    if (!control) return '';
    
    if (control.hasError('required')) {
      return `${this.getFieldLabel(fieldName)} is required`;
    }
    if (control.hasError('pattern')) {
      return `${this.getFieldLabel(fieldName)} contains invalid characters`;
    }
    if (control.hasError('server')) {
      return control.errors?.['server'];
    }
    return '';
  }

  private getFieldLabel(fieldName: string): string {
    const labels: { [key: string]: string } = {
      'name': 'Project Name',
      'caption': 'Caption',
      'description': 'Description',
      'defaultLocale': 'Default Locale',
      'supportedLocales': 'Supported Locales',
      'timezone': 'Timezone',
      'region': 'Region',
      'icon': 'Icon'
    };
    return labels[fieldName] || fieldName;
  }

  handleValidationError(error: HttpErrorResponse): void {
    if (error.status === 422 && error.error?.details) {
      // Show specific field errors
      error.error.details.forEach((detail: any) => {
        const control = this.form.get(detail.field);
        if (control) {
          control.setErrors({ server: detail.message });
          control.markAsTouched();
        }
      });
      
      this.snackBar.open(
        'Please fix the validation errors',
        'Close',
        { 
          duration: 5000,
          panelClass: ['error-snackbar']
        }
      );
    } else {
      // Generic error handling
      this.showMessage(
        error.error?.detail || error.message || 'Operation failed',
        'error'
      );
    }
  }

  save() {
    console.log('Save clicked - Form valid:', this.form.valid, 'Saving:', this.saving);
    console.log('Form errors:', this.form.errors);
    console.log('Form value:', this.form.value);
 
    if (this.form.invalid || this.saving) {
      // Mark all fields as touched to show validation errors
      Object.keys(this.form.controls).forEach(key => {
        const control = this.form.get(key);
        if (control) {
          control.markAsTouched();
          if (control.errors) {
            console.log(`Field ${key} errors:`, control.errors);
          }
        }
      });
      
      if (this.form.invalid) {
        this.showMessage('Please fill all required fields correctly', 'error');
      }
      return;
    }
    
    this.saving = true;
    
    const formValue = this.form.getRawValue(); // getRawValue to include disabled fields
    
    // Project data format matching backend expectations
    const projectData = {
      name: formValue.name,
      caption: formValue.caption,
      icon: formValue.icon,
      description: formValue.description,
      default_locale: formValue.defaultLocale,
      supported_locales: formValue.supportedLocales,
      timezone: formValue.timezone,
      region: formValue.region
    };
  
    const saveOperation = this.data.mode === 'create' 
      ? this.apiService.createProject(projectData)
      : this.apiService.updateProject(this.data.project.id, {
          ...projectData,
          last_update_date: this.data.project.last_update_date || ''
        });
  
    saveOperation
      .pipe(takeUntil(this.destroyed$))
      .subscribe({
        next: (result) => {
          this.saving = false;
          this.showMessage(
            this.data.mode === 'create' 
              ? 'Project created successfully!' 
              : 'Project updated successfully!'
          );
          this.dialogRef.close(result);
        },
        error: (error: HttpErrorResponse) => {
          this.saving = false;
          
          // Race condition handling
          if (error.status === 409) {
            const details = error.error?.details || {};
            this.snackBar.open(
              `Project was modified by ${details.last_update_user || 'another user'}. Please reload.`,
              'Reload',
              { duration: 0 }
            ).onAction().subscribe(() => {
              this.dialogRef.close('reload');
            });
          } else if (error.status === 422) {
            this.handleValidationError(error);
          } else {
            this.showMessage(
              error.error?.detail || 'Operation failed',
              'error'
            );
          }
        }
      });
  }

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

  private showMessage(message: string, type: 'success' | 'error' = 'success') {
    this.snackBar.open(message, 'Close', {
      duration: 5000,
      panelClass: type === 'error' ? ['error-snackbar'] : ['success-snackbar'],
      horizontalPosition: 'right',
      verticalPosition: 'top'
    });
  }
}