/**
 * 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, inject, ViewChild } from '@angular/core';
import {
  MatDialogRef,
  MatDialogTitle,
  MatDialogContent,
  MatDialogActions,
  MatDialog,
  MatDialogClose,
  MAT_DIALOG_DATA
} from '@angular/material/dialog';
import { CdkScrollable } from '@angular/cdk/scrolling';
import { MatDivider } from '@angular/material/divider';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';
import { KeyboardShortcutService, ShortcutItem } from '../../core/services/keyboard-shortcut.service';
import { FormsModule } from '@angular/forms';
import { NgClass } from '@angular/common';
import { MatButton } from '@angular/material/button';
import { ConfirmationDialogComponent } from '../confirmation-dialog/confirmation-dialog.component';
import { ShortcutUsageDialogComponent } from '../shortcut-usage-dialog/shortcut-usage-dialog.component';
import { MatIcon } from '@angular/material/icon';
import { MatFormField, MatLabel } from '@angular/material/form-field';
import { MatInput } from '@angular/material/input';
import { MatSelect } from '@angular/material/select';
import { MatOption } from '@angular/material/core';

@Component({
  selector: 'mifosx-keyboard-shortcuts-dialog',
  templateUrl: './keyboard-shortcuts-dialog.component.html',
  styleUrls: ['./keyboard-shortcuts-dialog.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    MatDialogTitle,
    CdkScrollable,
    MatDialogContent,
    MatDialogActions,
    MatDialogClose,
    MatButton,
    FormsModule,
    MatIcon,
    MatFormField,
    MatLabel,
    MatInput,
    MatSelect,
    MatOption
  ]
})
export class KeyboardShortcutsDialogComponent implements OnInit {
  dialogRef = inject<MatDialogRef<KeyboardShortcutsDialogComponent>>(MatDialogRef);
  private keyboardShortcutService = inject(KeyboardShortcutService);
  public data = inject(MAT_DIALOG_DATA, { optional: true });

  shortcuts: ShortcutItem[] = [];
  validationError: string | null = null;
  activeInputItem: ShortcutItem | null = null;
  displayedColumns: string[] = [
    'title',
    'keyCombination'
  ];

  isAddingNew = false;
  newShortcut: Partial<ShortcutItem> = {};
  activeNewInput = false;

  editingShortcutId: string | null = null;
  editingShortcutData: Partial<ShortcutItem> = {};
  activeEditInput = false;

  ngOnInit() {
    this.dialogRef.updateSize('800px');
    this.keyboardShortcutService.activeShortcuts$.subscribe((shortcuts) => {
      // Deep copy to allow editing without affecting the global state immediately
      this.shortcuts = JSON.parse(JSON.stringify(shortcuts));
    });

    if (this.data && this.data.prefill) {
      this.startAddShortcut();
      this.newShortcut = {
        ...this.newShortcut,
        ...this.data.prefill
      };
    }
  }

  formatShortcut(item: Partial<ShortcutItem>): string {
    if (!item || (!item.key && !item.ctrlKey && !item.shiftKey && !item.altKey)) return '';
    const parts = [];
    if (item.ctrlKey) parts.push('Ctrl');
    if (item.shiftKey) parts.push('Shift');
    if (item.altKey) parts.push('Alt');
    if (item.key) parts.push(item.key.toUpperCase());
    return parts.join(' + ');
  }

  onKeyDown(event: KeyboardEvent, item: Partial<ShortcutItem>, isNewOrEdit: boolean = false) {
    event.preventDefault();
    event.stopPropagation();

    // Ignore if only modifier keys are pressed
    if ([
        'Control',
        'Shift',
        'Alt',
        'Meta'
      ].includes(event.key)) {
      return;
    }

    item.ctrlKey = event.ctrlKey;
    item.shiftKey = event.shiftKey;
    item.altKey = event.altKey;
    item.key = event.key.toLowerCase();

    if (!isNewOrEdit) {
      this.activeInputItem = null;
      this.validateShortcuts();
    } else {
      this.activeNewInput = false;
      this.activeEditInput = false;
    }
  }

  validateShortcuts() {
    this.validationError = null;
    const seen = new Set<string>();

    for (const item of this.shortcuts) {
      if (!item.key) {
        this.validationError = `Invalid shortcut for ${item.title}: Key is required`;
        return;
      }

      const keyStr = `${!!item.ctrlKey}-${!!item.shiftKey}-${!!item.altKey}-${item.key.toLowerCase()}`;
      if (seen.has(keyStr)) {
        this.validationError = `Duplicate shortcut detected: ${this.formatShortcut(item)}`;
        return;
      }
      seen.add(keyStr);
    }
  }

  startAddShortcut() {
    this.isAddingNew = true;
    this.newShortcut = {
      title: '',
      route: '',
      key: '',
      ctrlKey: false,
      shiftKey: false,
      altKey: false,
      action: 'navigate',
      custom: true,
      id: 'custom_' + Date.now()
    };
    this.validationError = null;
  }

  cancelAddShortcut() {
    this.isAddingNew = false;
    this.validationError = null;
  }

  private dialog = inject(MatDialog);

  @ViewChild('shortcutDetailsTemplate') shortcutDetailsTemplate: any;
  private detailsDialogRef: MatDialogRef<any> | null = null;

  showShortcutDetails(item: ShortcutItem) {
    this.detailsDialogRef = this.dialog.open(this.shortcutDetailsTemplate, {
      data: item,
      width: '400px'
    });
  }

  openUsagePopup() {
    this.dialog.open(ShortcutUsageDialogComponent, {
      width: '600px'
    });
  }

  getShortcutDescription(item: Partial<ShortcutItem>): string {
    if (item.custom) {
      if (item.action === 'navigate') {
        return `Navigates to the ${item.title} page.`;
      }
      return `Executes the ${item.action} action.`;
    } else {
      switch (item.id) {
        case 'logout':
          return 'Logs you out of the application securely.';
        case 'help':
          return 'Opens the user manual and help documentation.';
        case 'runReport':
          return 'Executes the currently selected report.';
        case 'cancel':
          return 'Cancels the current operation or form.';
        case 'submit':
          return 'Submits the current form or dialog.';
        default:
          return `Navigates to the predefined ${item.title} feature.`;
      }
    }
  }

  saveNewShortcut() {
    if (this.newShortcut.action === 'navigate' && this.newShortcut.route) {
      this.newShortcut.route = this.keyboardShortcutService.normalizeRouteStr(this.newShortcut.route);
    }
    if (this.validateSingleShortcut(this.newShortcut, null)) {
      this.shortcuts.push(this.newShortcut as ShortcutItem);
      this.isAddingNew = false;
      this.validateShortcuts();
      if (!this.validationError) {
        this.keyboardShortcutService.updateShortcuts(this.shortcuts);
      }
    }
  }

  startEditShortcut(item: ShortcutItem) {
    if (this.detailsDialogRef) {
      this.detailsDialogRef.close();
      this.detailsDialogRef = null;
    }
    this.editingShortcutId = item.id || null;
    this.editingShortcutData = { ...item };
    this.validationError = null;
  }

  cancelEditShortcut() {
    this.editingShortcutId = null;
    this.validationError = null;
  }

  saveEditShortcut() {
    if (this.editingShortcutData.action === 'navigate' && this.editingShortcutData.route) {
      this.editingShortcutData.route = this.keyboardShortcutService.normalizeRouteStr(this.editingShortcutData.route);
    }
    if (this.validateSingleShortcut(this.editingShortcutData, this.editingShortcutId)) {
      const index = this.shortcuts.findIndex((s) => s.id === this.editingShortcutId);
      if (index > -1) {
        this.shortcuts[index] = { ...this.editingShortcutData } as ShortcutItem;
      }
      this.editingShortcutId = null;
      this.validateShortcuts();
      if (!this.validationError) {
        this.keyboardShortcutService.updateShortcuts(this.shortcuts);
      }
    }
  }

  deleteShortcut(item: ShortcutItem) {
    if (this.detailsDialogRef) {
      this.detailsDialogRef.close();
      this.detailsDialogRef = null;
    }
    this.shortcuts = this.shortcuts.filter((s) => (s.id ? s.id !== item.id : s.title !== item.title));
    this.validateShortcuts();
    if (!this.validationError) {
      this.keyboardShortcutService.updateShortcuts(this.shortcuts);
    }
  }

  validateSingleShortcut(item: Partial<ShortcutItem>, excludeId: string | null): boolean {
    if (!item.title || item.title.trim() === '') {
      this.validationError = 'Shortcut Name is required';
      return false;
    }
    if (!item.key) {
      this.validationError = 'Key combination is required';
      return false;
    }
    if (item.action === 'navigate' && (!item.route || item.route.trim() === '')) {
      this.validationError = 'URL / Route is required';
      return false;
    }

    const keyStr = `${!!item.ctrlKey}-${!!item.shiftKey}-${!!item.altKey}-${item.key.toLowerCase()}`;
    const seen = new Set<string>();

    for (const s of this.shortcuts) {
      if (excludeId && s.id === excludeId) continue;
      seen.add(`${!!s.ctrlKey}-${!!s.shiftKey}-${!!s.altKey}-${s.key.toLowerCase()}`);
    }

    if (seen.has(keyStr)) {
      this.validationError = `Duplicate shortcut detected: ${this.formatShortcut(item)}`;
      return false;
    }

    this.validationError = null;
    return true;
  }

  save() {
    this.validateShortcuts();
    if (!this.validationError) {
      this.keyboardShortcutService.updateShortcuts(this.shortcuts);
      this.dialogRef.close(true);
    }
  }

  resetToDefaults() {
    const dialogRef = this.dialog.open(ConfirmationDialogComponent, {
      data: {
        heading: 'Reset Keyboard Shortcuts',
        dialogContext:
          'Are you sure you want to reset all keyboard shortcuts to their default configuration? This will remove all custom shortcuts and restore default keys.',
        type: 'Warn'
      }
    });

    dialogRef.afterClosed().subscribe((confirm: boolean) => {
      if (confirm) {
        this.keyboardShortcutService.resetToDefaults();
        this.dialogRef.close(true);
      }
    });
  }

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