import { Component, Inject, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormBuilder, FormGroup, Validators, ReactiveFormsModule } 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 { MatButtonModule } from '@angular/material/button';
import { MatIconModule } from '@angular/material/icon';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { ApiService } from '../../services/api.service';

@Component({
  selector: 'app-project-edit-dialog',
  standalone: true,
  imports: [
    CommonModule,
    ReactiveFormsModule,
    MatDialogModule,
    MatFormFieldModule,
    MatInputModule,
    MatButtonModule,
    MatIconModule,
    MatSnackBarModule
  ],
  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 *ngIf="form.get('name')?.hasError('required')">Name is required</mat-error>
          <mat-error *ngIf="form.get('name')?.hasError('pattern')">Invalid characters in 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-form-field>

        <div class="metadata" *ngIf="data.mode === 'edit' && data.project">
          <div class="metadata-item">
            <mat-icon>calendar_today</mat-icon>
            <span>Created: {{ formatDate(data.project.created_date) }} by <strong>{{ data.project.created_by || 'unknown' }}</strong></span>
          </div>
          <div class="metadata-item">
            <mat-icon>update</mat-icon>
            <span>Modified: {{ formatDate(data.project.last_update_date) }} by <strong>{{ data.project.last_update_user || 'unknown' }}</strong></span>
          </div>
        </div>
      </form>
    </mat-dialog-content>
    
    <mat-dialog-actions align="end">
      <button mat-button (click)="cancel()">Cancel</button>
      <button mat-raised-button color="primary" 
              (click)="save()" 
              [disabled]="form.invalid || saving">
        {{ saving ? 'Saving...' : 'Save' }}
      </button>
    </mat-dialog-actions>
  `,
  styles: [`
    mat-dialog-content {
      padding: 20px 24px;
      min-width: 400px;
    }

    .full-width {
      width: 100%;
      margin-bottom: 16px;
    }

    .metadata {
      margin-top: 24px;
      padding: 16px;
      background-color: #f5f5f5;
      border-radius: 4px;

      .metadata-item {
        display: flex;
        align-items: center;
        gap: 8px;
        margin-bottom: 8px;

        &:last-child {
          margin-bottom: 0;
        }

        mat-icon {
          color: #666;
          font-size: 20px;
          width: 20px;
          height: 20px;
        }

        span {
          color: #666;
          font-size: 14px;

          strong {
            color: #333;
          }
        }
      }
    }

    mat-dialog-actions {
      padding: 16px 24px;
      margin: 0;
    }
  `]
})
export default class ProjectEditDialogComponent implements OnInit {
  form!: FormGroup;
  saving = false;

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

  ngOnInit() {
    this.form = this.fb.group({
      name: [
        { value: '', disabled: this.data.mode === 'edit' }, 
        [Validators.required, Validators.pattern(/^[a-zA-Z0-9_]+$/)]
      ],
      caption: [''],
      last_update_date: ['']
    });

    if (this.data.mode === 'edit' && this.data.project) {
      this.form.patchValue(this.data.project);
    }
  }

  formatDate(dateString: string | undefined): string {
    if (!dateString) return 'Unknown';
    return new Date(dateString).toLocaleDateString();
  }

  async save() {
    if (this.form.invalid) return;

    this.saving = true;
    try {
      const formData = this.form.getRawValue();

      if (this.data.mode === 'create') {
        await this.apiService.createProject(formData).toPromise();
        this.snackBar.open('Project created successfully', 'Close', { duration: 3000 });
      } else {
        await this.apiService.updateProject(this.data.project.id, formData).toPromise();
        this.snackBar.open('Project updated successfully', 'Close', { duration: 3000 });
      }

      this.dialogRef.close(true);
    } catch (error: any) {
      const message = error.error?.detail || 
        (this.data.mode === 'create' ? 'Failed to create project' : 'Failed to update project');
      this.snackBar.open(message, 'Close', { 
        duration: 5000, 
        panelClass: 'error-snackbar' 
      });
    } finally {
      this.saving = false;
    }
  }

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