/**
 * 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 { ActivatedRoute, Router } from '@angular/router';
import { FormsModule } from '@angular/forms';
import { MatDialog } from '@angular/material/dialog';
import { MatMenuModule } from '@angular/material/menu';
import { MatTooltip } from '@angular/material/tooltip';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { STANDALONE_SHARED_IMPORTS } from 'app/standalone-shared.module';

import { UsersService } from './users.service';
import { DeleteDialogComponent } from 'app/shared/delete-dialog/delete-dialog.component';
import { SuccessDialogComponent } from 'app/shared/success-dialog/success-dialog.component';
import { ErrorDialogComponent } from 'app/shared/error-dialog/error-dialog.component';
import { ChangePasswordDialogComponent } from 'app/shared/change-password-dialog/change-password-dialog.component';
import { UserFormDialogComponent, UserFormDialogData } from './user-form-dialog/user-form-dialog.component';
import {
  UserDetailsDialogComponent,
  UserDetailsDialogData,
  UserDetailsDialogResult
} from './user-details-dialog/user-details-dialog.component';

interface UserRow {
  id: string;
  username: string;
  firstname: string;
  lastname: string;
  fullName: string;
  email: string;
  mobileNo: string;
  officeName: string;
  staffDisplayName: string;
  roles: string[];
  isSelfServiceUser: boolean;
  raw: any;
}

/**
 * Users — Nexora redesign.
 *
 * Hero header + KPI strip + searchable Nexora table with per-row
 * View / Edit / Delete actions (with kebab menu for less-common ops).
 */
@Component({
  selector: 'mifosx-users',
  templateUrl: './users.component.html',
  styleUrls: ['./users.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    FormsModule,
    FaIconComponent,
    MatTooltip,
    MatMenuModule
  ]
})
export class UsersComponent {
  private route = inject(ActivatedRoute);
  private router = inject(Router);
  private dialog = inject(MatDialog);
  private usersService = inject(UsersService);

  /** All users normalised to UserRow for the table. */
  rows: UserRow[] = [];

  /** Search text. */
  search = '';

  /** Office filter — empty = all. */
  officeFilter = '';

  /** 'all' | 'staff' | 'selfservice' role filter. */
  roleFilter: '' | 'staff' | 'selfservice' = '';

  constructor() {
    this.route.data.subscribe((data: { users: any }) => {
      this.buildRows(data.users || []);
    });
  }

  private buildRows(users: any[]): void {
    this.rows = users.map((u: any) => {
      const fn = (u.firstname || '').trim();
      const ln = (u.lastname || '').trim();
      const fullName =
        [
          fn,
          ln
        ]
          .filter(Boolean)
          .join(' ') || u.username;
      const roles: string[] = (u.selectedRoles || u.availableRoles || []).map((r: any) => r?.name).filter(Boolean);
      return {
        id: String(u.id),
        username: u.username || '',
        firstname: fn,
        lastname: ln,
        fullName,
        email: u.email || '',
        mobileNo: u.mobileNo || '',
        officeName: u.officeName || '',
        staffDisplayName: u.staffDisplayName || '',
        roles,
        isSelfServiceUser: !!u.isSelfServiceUser,
        raw: u
      };
    });
  }

  // ───── KPIs ─────
  get totalUsers(): number {
    return this.rows.length;
  }

  get selfServiceCount(): number {
    return this.rows.filter((r) => r.isSelfServiceUser).length;
  }

  get staffUsersCount(): number {
    return this.rows.filter((r) => !r.isSelfServiceUser).length;
  }

  /** Distinct offices represented in the user list. */
  get distinctOfficesCount(): number {
    return new Set(this.rows.map((r) => r.officeName).filter(Boolean)).size;
  }

  /** Office names for the office filter dropdown. */
  get officeOptions(): string[] {
    return Array.from(new Set(this.rows.map((r) => r.officeName).filter(Boolean))).sort();
  }

  // ───── Filtering ─────
  get filteredRows(): UserRow[] {
    const q = this.search.trim().toLowerCase();
    return this.rows.filter((r) => {
      if (this.officeFilter && r.officeName !== this.officeFilter) return false;
      if (this.roleFilter === 'staff' && r.isSelfServiceUser) return false;
      if (this.roleFilter === 'selfservice' && !r.isSelfServiceUser) return false;
      if (!q) return true;
      const hay =
        `${r.username} ${r.fullName} ${r.email} ${r.mobileNo} ${r.officeName} ${r.roles.join(' ')}`.toLowerCase();
      return hay.includes(q);
    });
  }

  clearFilters(): void {
    this.search = '';
    this.officeFilter = '';
    this.roleFilter = '';
  }

  // ───── Row actions (all popup-driven now) ─────
  /**
   * Open the read-only details popup. The footer of the details dialog can
   * chain into edit / delete / change-password without leaving the list.
   */
  viewUser(row: { id: string; username: string }): void {
    const ref = this.dialog.open<UserDetailsDialogComponent, UserDetailsDialogData, UserDetailsDialogResult>(
      UserDetailsDialogComponent,
      {
        data: { userId: row.id },
        panelClass: 'udd-panel',
        autoFocus: false
      }
    );
    ref.afterClosed().subscribe((action) => {
      if (action === 'edit') this.editUser(row);
      else if (action === 'delete') this.deleteUser(row as UserRow);
      else if (action === 'change-password') this.changePassword(row);
    });
  }

  /** Open the user form popup in edit mode. */
  editUser(row: { id: string }): void {
    const ref = this.dialog.open<UserFormDialogComponent, UserFormDialogData, any>(UserFormDialogComponent, {
      data: { mode: 'edit', userId: row.id },
      panelClass: 'ufd-panel',
      autoFocus: false
    });
    ref.afterClosed().subscribe((result) => {
      if (result?.ok) {
        this.showSuccess('User Updated', `Changes to "${result.username}" have been saved.`);
        this.refreshUsers();
      }
    });
  }

  /** Open the user form popup in create mode. */
  createUser(): void {
    const ref = this.dialog.open<UserFormDialogComponent, UserFormDialogData, any>(UserFormDialogComponent, {
      data: { mode: 'create' },
      panelClass: 'ufd-panel',
      autoFocus: false
    });
    ref.afterClosed().subscribe((result) => {
      if (result?.ok) {
        this.showSuccess('User Created', `"${result.username}" has been added.`);
        this.refreshUsers();
      }
    });
  }

  /** Change-password popup — same dialog the legacy view-user uses. */
  changePassword(row: { id: string; username?: string }): void {
    const ref = this.dialog.open(ChangePasswordDialogComponent, { width: '440px' });
    ref.afterClosed().subscribe((response: any) => {
      if (!response?.password || !response?.repeatPassword) return;
      // Backend expects `firstname` in the payload (Fineract quirk) — pull from
      // the row's cached payload when we have it, otherwise fetch fresh.
      const cached = this.rows.find((r) => r.id === row.id);
      const firstname = cached?.firstname || cached?.fullName || row.username || '';
      const body = {
        password: response.password,
        repeatPassword: response.repeatPassword,
        firstname
      };
      this.usersService.changePassword(row.id, body).subscribe({
        next: () => this.showSuccess('Password Updated', `New password set for "${row.username || row.id}".`),
        error: (err: any) => {
          const apiMsg = err?.error?.errors?.[0]?.defaultUserMessage || 'Please try again.';
          this.showError(`Failed to update password. ${apiMsg}`);
        }
      });
    });
  }

  /** Delete user with confirm + polished outcome dialog. */
  deleteUser(row: UserRow): void {
    const ref = this.dialog.open(DeleteDialogComponent, {
      data: { deleteContext: `user "${row.username}"` }
    });
    ref.afterClosed().subscribe((response: any) => {
      if (!response?.delete) return;
      this.usersService.deleteUser(row.id).subscribe({
        next: () => {
          this.showSuccess('User Removed', `"${row.username}" has been deleted.`);
          this.refreshUsers();
        },
        error: (err: any) => {
          const apiMsg =
            err?.error?.errors?.[0]?.defaultUserMessage || err?.error?.developerMessage || 'Please try again.';
          this.showError(`Failed to remove "${row.username}". ${apiMsg}`);
        }
      });
    });
  }

  /** Copy the user's login name. */
  copyUsername(row: UserRow): void {
    navigator.clipboard
      ?.writeText(row.username)
      .then(() => this.showSnackSuccess(`Copied "${row.username}" to clipboard.`))
      .catch(() => this.showError('Clipboard access was blocked by the browser.'));
  }

  private refreshUsers(): void {
    this.usersService.getUsers().subscribe((users: any[]) => this.buildRows(users || []));
  }

  // ───── Dialog helpers ─────
  private showSuccess(title: string, message: string): void {
    this.dialog.open(SuccessDialogComponent, {
      data: { title, message, buttonLabel: 'OK' },
      panelClass: 'sd-panel'
    });
  }

  /** Used for lightweight confirmations like "copied to clipboard". */
  private showSnackSuccess(message: string): void {
    this.dialog.open(SuccessDialogComponent, {
      data: { title: 'Copied', message, buttonLabel: 'OK' },
      panelClass: 'sd-panel'
    });
  }

  private showError(message: string): void {
    this.dialog.open(ErrorDialogComponent, { data: message });
  }

  // ───── Misc ─────
  trackRow = (_i: number, r: UserRow) => r.id;

  initials(row: UserRow): string {
    const a = (row.firstname || row.username).charAt(0);
    const b = (row.lastname || '').charAt(0);
    return `${a}${b}`.toUpperCase() || '?';
  }
}