/**
 * Copyright since 2025 Mifos Initiative
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

import { Component, inject } from '@angular/core';
import { CommonModule } from '@angular/common';
import { Router, RouterModule } from '@angular/router';
import { FormsModule } from '@angular/forms';
import { MatCardModule } from '@angular/material/card';
import { MatButtonModule } from '@angular/material/button';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatProgressBarModule } from '@angular/material/progress-bar';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { SponsorDDReconciliationService } from '../sponsor-dd-reconciliation.service';

@Component({
  selector: 'mifosx-reco-batch-upload',
  standalone: true,
  imports: [
    CommonModule,
    RouterModule,
    FormsModule,
    MatCardModule,
    MatButtonModule,
    MatSnackBarModule,
    MatProgressBarModule,
    FaIconComponent
  ],
  templateUrl: './reco-batch-upload.component.html',
  styles: [
    `
      .upload-container {
        padding: 24px;
        max-width: 600px;
        margin: 0 auto;
      }
      .header-row {
        margin-bottom: 24px;
      }
      .header-row h2 {
        margin: 0 0 4px 0;
        font-size: 24px;
        font-weight: 600;
        color: #1e293b;
      }
      .header-row p {
        margin: 0;
        color: #64748b;
        font-size: 14px;
      }
      .mat-mdc-card {
        border-radius: 12px;
        border: 1px solid #e2e8f0;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
        padding: 32px;
      }
      .dropzone {
        border: 2px dashed #cbd5e1;
        border-radius: 8px;
        padding: 40px 20px;
        text-align: center;
        background-color: #f8fafc;
        cursor: pointer;
        transition:
          border-color 0.2s,
          background-color 0.2s;
      }
      .dropzone:hover {
        border-color: #7c3aed;
        background-color: #f1f5f9;
      }
      .dropzone-icon {
        font-size: 48px;
        color: #94a3b8;
        margin-bottom: 16px;
      }
      .file-details {
        margin-top: 24px;
        padding: 16px;
        background-color: #f1f5f9;
        border-radius: 6px;
        display: flex;
        justify-content: space-between;
        align-items: center;
      }
      .file-name {
        font-weight: 500;
        color: #334155;
      }
      .file-size {
        font-size: 12px;
        color: #64748b;
      }
      .actions {
        display: flex;
        justify-content: flex-end;
        gap: 12px;
        margin-top: 24px;
      }
      .progress-section {
        margin-top: 24px;
        text-align: center;
      }
      .progress-text {
        font-size: 12px;
        color: #64748b;
        margin-top: 8px;
      }
    `
  ]
})
export class RecoBatchUploadComponent {
  private recoService = inject(SponsorDDReconciliationService);
  private router = inject(Router);
  private snackBar = inject(MatSnackBar);

  selectedFile: File | null = null;
  loading = false;
  progressMessage = '';

  onFileSelected(event: any): void {
    const file = event.target.files[0];
    if (file) {
      this.selectedFile = file;
    }
  }

  triggerFileSelect(fileInput: HTMLInputElement): void {
    fileInput.click();
  }

  onSubmit(): void {
    if (!this.selectedFile) return;

    this.loading = true;
    this.progressMessage = 'Reading file and preparing upload payload...';

    const reader = new FileReader();
    reader.onload = () => {
      const fileContent = reader.result as string;
      this.progressMessage = 'Uploading clearing scroll for processing...';

      this.recoService
        .uploadClearingScroll({
          fileName: this.selectedFile!.name,
          fileContent: fileContent
        })
        .subscribe({
          next: (res) => {
            this.snackBar.open(
              `Reconciliation batch processed successfully. ${res.successCount} matched, ${res.mismatchCount} exceptions.`,
              'Close',
              { duration: 7000 }
            );
            this.router.navigate([
              '/sponsor-dd-reconciliation/batches',
              res.id
            ]);
          },
          error: (err) => {
            this.loading = false;
            this.progressMessage = '';
            this.snackBar.open('Reconciliation failed: ' + (err.error?.message || err.message), 'Close', {
              duration: 6000
            });
          }
        });
    };

    reader.readAsDataURL(this.selectedFile); // Reads as Base64 Data URL, which our backend decodes safely.
  }
}