/**
 * 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, OnInit, AfterViewInit, ViewChild, inject } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterModule } from '@angular/router';
import { FormsModule, ReactiveFormsModule, FormBuilder, FormGroup, Validators } from '@angular/forms';
import { MatCardModule } from '@angular/material/card';
import { MatTableModule, MatTableDataSource } from '@angular/material/table';
import { MatPaginatorModule, MatPaginator } from '@angular/material/paginator';
import { MatButtonModule } from '@angular/material/button';
import { MatDialog, MatDialogModule, MatDialogRef, MAT_DIALOG_DATA } from '@angular/material/dialog';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { SponsorDDService } from '../sponsor-dd.service';
import { SignatureSettingsDialogComponent } from '../signature-settings-dialog/signature-settings-dialog.component';

@Component({
  selector: 'mifosx-dd-issue-approvals',
  standalone: true,
  imports: [
    CommonModule,
    RouterModule,
    MatCardModule,
    MatTableModule,
    MatPaginatorModule,
    MatButtonModule,
    MatDialogModule,
    MatSnackBarModule,
    MatFormFieldModule,
    MatInputModule
  ],
  templateUrl: './dd-issue-approvals.component.html',
  styles: [
    `
      .approvals-container {
        padding: 24px;
        max-width: 1300px;
        margin: 0 auto;
      }
      .header-row {
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        margin-bottom: 24px;
      }
      .title-area h2 {
        margin: 0 0 4px 0;
        font-size: 24px;
        font-weight: 600;
        color: #1e293b;
      }
      .title-area p {
        margin: 0;
        color: #64748b;
        font-size: 14px;
      }
      .search-field {
        width: 320px;
        display: block;
        margin-bottom: 8px;
      }
      .mat-mdc-card {
        border-radius: 12px;
        border: 1px solid #e2e8f0;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
        overflow: hidden;
      }
      table {
        width: 100%;
      }
      th {
        font-weight: 600;
        color: #475569;
        background-color: #f8fafc;
      }
      td {
        color: #334155;
      }
      .status-badge {
        display: inline-flex;
        align-items: center;
        padding: 4px 8px;
        border-radius: 9999px;
        font-size: 12px;
        font-weight: 500;
      }
      .status-badge.pending {
        background-color: #fef3c7;
        color: #b45309;
      }
      .status-badge.approved {
        background-color: #dcfce7;
        color: #15803d;
      }
      .status-badge.rejected {
        background-color: #fee2e2;
        color: #b91c1c;
      }
      .action-btn-group {
        display: flex;
        gap: 8px;
      }
      .status-filter-row {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
        margin-bottom: 16px;
      }
      .status-filter-row button.filter-active {
        background-color: #ede9fe;
      }
      .filter-count {
        color: #64748b;
        margin-left: 4px;
      }
    `
  ]
})
export class DdIssueApprovalsComponent implements OnInit, AfterViewInit {
  private sponsorDDService = inject(SponsorDDService);
  private dialog = inject(MatDialog);
  private snackBar = inject(MatSnackBar);

  @ViewChild(MatPaginator) paginator!: MatPaginator;

  displayedColumns: string[] = [
    'id',
    'ddNumber',
    'clientName',
    'beneficiaryName',
    'faceValue',
    'paymentMethod',
    'paymentType',
    'status',
    'makerUsername',
    'createdDate',
    'actions'
  ];
  dataSource = new MatTableDataSource<any>([]);

  readonly statusOptions: string[] = [
    'PENDING',
    'APPROVED',
    'REJECTED',
    'ALL'
  ];
  selectedStatus = 'PENDING';
  searchText = '';

  ngOnInit(): void {
    this.dataSource.filterPredicate = (data) => {
      const statusMatches = this.selectedStatus === 'ALL' || data.status === this.selectedStatus;
      const searchMatches =
        !this.searchText || (data.ddNumber || '').toLowerCase().includes(this.searchText.trim().toLowerCase());
      return statusMatches && searchMatches;
    };
    this.loadRequests();
  }

  ngAfterViewInit(): void {
    this.dataSource.paginator = this.paginator;
  }

  loadRequests(): void {
    this.sponsorDDService.getAllIssueRequests().subscribe({
      next: (data) => {
        this.dataSource.data = data;
        this.applyFilter();
      },
      error: (err) => {
        this.snackBar.open('Error loading requests: ' + (err.error?.message || err.message), 'Close', {
          duration: 5000
        });
      }
    });
  }

  paymentTypeLabel(element: any): string {
    if (element.paymentMethod === 'CASH') {
      return 'Cash';
    }
    if (element.paymentMethod === 'CHEQUE') {
      return 'Cheque';
    }
    if (element.savingsAccountId) {
      return 'Savings';
    }
    if (element.currentAccountId) {
      return 'Current';
    }
    return '-';
  }

  statusCount(status: string): number {
    const all = this.dataSource.data;
    return status === 'ALL' ? all.length : all.filter((r) => r.status === status).length;
  }

  filterByStatus(status: string): void {
    this.selectedStatus = status;
    this.applyFilter();
  }

  onSearchChange(value: string): void {
    this.searchText = value;
    this.applyFilter();
  }

  private applyFilter(): void {
    this.dataSource.filter = `${this.selectedStatus}|${this.searchText}`;
    if (this.dataSource.paginator) {
      this.dataSource.paginator.firstPage();
    }
  }

  /** Every row sharing one batchId was submitted together as one multi-DD slip. */
  batchSiblings(request: any): any[] {
    return request.batchId ? this.dataSource.data.filter((r) => r.batchId === request.batchId) : [request];
  }

  batchSiblingCount(request: any): number {
    return this.batchSiblings(request).length;
  }

  approve(request: any): void {
    if (request.batchId) {
      this.approveBatch(request);
      return;
    }
    if (
      !confirm(
        `Approve DD issuance for DD No. ${request.ddNumber} (₹${request.faceValue})? This will debit the account (or clear the cheque) and issue the draft.`
      )
    ) {
      return;
    }
    this.sponsorDDService.approveIssueRequest(request.id).subscribe({
      next: () => {
        this.snackBar.open('DD issuance approved and posted successfully', 'Close', { duration: 3000 });
        this.loadRequests();
      },
      error: (err) => {
        this.snackBar.open('Error: ' + (err.error?.message || err.message), 'Close', { duration: 6000 });
      }
    });
  }

  private approveBatch(request: any): void {
    const siblings = this.batchSiblings(request);
    const lines = siblings.map((r) => `  • ${r.beneficiaryName} — ₹${r.faceValue}`).join('\n');
    const total = siblings.reduce((sum, r) => sum + (Number(r.faceValue) || 0), 0);
    if (
      !confirm(
        `Approve this DD slip - ${siblings.length} drafts, combined face value ₹${total}?\n${lines}\n\n` +
          'This debits the account (or clears the cheque) ONCE for the combined total and issues every draft in the slip.'
      )
    ) {
      return;
    }
    this.sponsorDDService.approveIssueRequestBatch(request.batchId).subscribe({
      next: () => {
        this.snackBar.open('DD slip approved and posted successfully', 'Close', { duration: 3000 });
        this.loadRequests();
      },
      error: (err) => {
        this.snackBar.open('Error: ' + (err.error?.message || err.message), 'Close', { duration: 6000 });
      }
    });
  }

  openRejectDialog(request: any): void {
    const dialogRef = this.dialog.open(RejectIssueRequestDialogComponent, {
      width: '450px',
      data: { request, siblingCount: this.batchSiblingCount(request) },
      disableClose: true
    });

    dialogRef.afterClosed().subscribe((result) => {
      if (result) {
        this.loadRequests();
      }
    });
  }

  openSignatureSettings(): void {
    this.dialog.open(SignatureSettingsDialogComponent, {
      width: '450px'
    });
  }
}

// ── REJECT DIALOG COMPONENT ──
@Component({
  selector: 'mifosx-reject-issue-request-dialog',
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    ReactiveFormsModule,
    MatDialogModule,
    MatFormFieldModule,
    MatInputModule,
    MatButtonModule
  ],
  template: `
    <h2 mat-dialog-title>
      Reject DD Issuance {{ data.request.batchId ? 'Slip' : 'Request' }} (DD No: {{ data.request.ddNumber
      }}{{ data.siblingCount > 1 ? ' + ' + (data.siblingCount - 1) + ' more' : '' }})
    </h2>
    <mat-dialog-content>
      <p class="hint-text" *ngIf="data.request.batchId">
        This slip has {{ data.siblingCount }} drafts — rejecting applies to all of them together.
      </p>
      <form [formGroup]="rejectForm" class="dialog-form">
        <mat-form-field appearance="outline" class="full-width">
          <mat-label>Rejection Reason</mat-label>
          <textarea matInput formControlName="rejectionReason" rows="3"></textarea>
          <mat-error *ngIf="rejectForm.get('rejectionReason')?.hasError('required')">Reason is required</mat-error>
        </mat-form-field>
      </form>
    </mat-dialog-content>
    <mat-dialog-actions align="end">
      <button mat-button (click)="onCancel()">Cancel</button>
      <button mat-flat-button color="warn" [disabled]="rejectForm.invalid || loading" (click)="onSubmit()">
        Confirm Rejection
      </button>
    </mat-dialog-actions>
  `,
  styles: [
    `
      .dialog-form {
        display: flex;
        flex-direction: column;
        gap: 12px;
        padding-top: 8px;
      }
      .full-width {
        width: 100%;
      }
      .hint-text {
        color: #64748b;
        font-size: 13px;
        margin: 0 0 12px 0;
      }
    `
  ]
})
export class RejectIssueRequestDialogComponent implements OnInit {
  private fb = inject(FormBuilder);
  private sponsorDDService = inject(SponsorDDService);
  private dialogRef = inject(MatDialogRef<RejectIssueRequestDialogComponent>);
  private snackBar = inject(MatSnackBar);
  protected data = inject(MAT_DIALOG_DATA);

  rejectForm!: FormGroup;
  loading = false;

  ngOnInit(): void {
    this.rejectForm = this.fb.group({
      rejectionReason: [
        '',
        Validators.required
      ]
    });
  }

  onCancel(): void {
    this.dialogRef.close(false);
  }

  onSubmit(): void {
    if (this.rejectForm.invalid) return;

    this.loading = true;
    const reason = this.rejectForm.value.rejectionReason;
    const request$ = this.data.request.batchId
      ? this.sponsorDDService.rejectIssueRequestBatch(this.data.request.batchId, reason)
      : this.sponsorDDService.rejectIssueRequest(this.data.request.id, reason);
    request$.subscribe({
      next: () => {
        this.snackBar.open(this.data.request.batchId ? 'DD slip rejected' : 'DD issuance request rejected', 'Close', {
          duration: 3000
        });
        this.dialogRef.close(true);
      },
      error: (err) => {
        this.loading = false;
        this.snackBar.open('Error: ' + (err.error?.message || err.message), 'Close', { duration: 5000 });
      }
    });
  }
}