/**
 * 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 } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { FaIconComponent } from '@fortawesome/angular-fontawesome';
import { environment } from '../../../environments/environment';

interface MenuRow {
  code: string;
  label: string;
  icon: string;
  enabled: boolean;
}

interface TenantOption {
  identifier: string;
  name: string;
}

/**
 * Standalone platform-operator screen — deliberately outside the normal login/tenant-selector flow
 * every other page in this app goes through. It talks to the backend with a hand-entered API key
 * (`X-Api-Key`) instead of a Fineract session, exactly the credential `TenantMenuAccessApiResource`
 * requires for its write side and accepts for its reads. Reachable at #/platform-admin/menu-access
 * without logging in, on purpose: the real security boundary is the key, checked on the backend, not
 * this page's URL — a bank's own super user has no way to obtain that key at all, and without it
 * every call here 401s regardless of who is looking at the page.
 *
 * The key itself is minted once via `POST /v1/apiclients` (super-user session, one-time) and pasted
 * in below; this page only remembers it in this browser's localStorage for convenience across visits,
 * it is never sent anywhere but the two endpoints below.
 */
@Component({
  selector: 'mifosx-platform-menu-access',
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    FaIconComponent
  ],
  templateUrl: './menu-access.component.html',
  styleUrl: './menu-access.component.scss'
})
export class PlatformMenuAccessComponent {
  private static readonly KEY_STORAGE = 'cbsx_platform_api_key';

  /** Every menu code TenantMenuAccessApiResource knows about, with the label and icon shown on this
   *  bank's own top nav — same icon names as shell.component.html, so a toggle here is recognisable
   *  as the exact item it controls. Kept in the same order as the nav's two rows. */
  private static readonly ALL_MENUS: { code: string; label: string; icon: string }[] = [
    { code: 'MENU_INSTITUTION', label: 'Client Master', icon: 'users-cog' },
    { code: 'SIDEBAR_CFCFRMS', label: 'CFCFRMS', icon: 'user-shield' },
    { code: 'MENU_TASKS', label: 'Approvals', icon: 'check' },
    { code: 'MENU_CASHIER', label: 'Cashier', icon: 'money-bill' },
    { code: 'MENU_CLERK', label: 'Clerk', icon: 'id-card' },
    { code: 'MENU_BRANCH_OPS', label: 'Branch Ops', icon: 'building' },
    { code: 'MENU_CLEARING', label: 'Clearing', icon: 'exchange-alt' },
    { code: 'MENU_DEPOSITS', label: 'Deposits', icon: 'piggy-bank' },
    { code: 'MENU_ADVANCES', label: 'Advances', icon: 'hand-holding-usd' },
    { code: 'MENU_LOAN_ORIGINATION', label: 'Loan Origination', icon: 'clipboard-check' },
    { code: 'MENU_SHARE', label: 'Share', icon: 'coins' },
    { code: 'MENU_NPA', label: 'NPA', icon: 'exclamation-triangle' },
    { code: 'MENU_GENERAL_LEDGER', label: 'General Ledger', icon: 'book-open' },
    { code: 'MENU_SUB_LEDGER', label: 'Sub Ledger', icon: 'book' },
    { code: 'MENU_ACCOUNTING', label: 'Accounting', icon: 'money-bill-alt' },
    { code: 'MENU_CKYC_MGMT', label: 'CKYC', icon: 'fingerprint' },
    { code: 'MENU_INSURANCE', label: 'Insurance', icon: 'shield-alt' },
    { code: 'MENU_DIGITAL', label: 'Digital', icon: 'mobile-alt' },
    { code: 'MENU_HRM', label: 'HRM', icon: 'money-check' },
    { code: 'MENU_ADMIN', label: 'Admin', icon: 'shield-alt' },
    { code: 'MENU_RBI', label: 'RBI', icon: 'university' },
    { code: 'MENU_INVESTMENT', label: 'Investment', icon: 'chart-line' },
    { code: 'MENU_REPORTS', label: 'Reports', icon: 'chart-bar' },
    { code: 'MENU_OTHERS', label: 'Others', icon: 'folder-open' },
    { code: 'MENU_CONFIG_WIZARD', label: 'Reconciliation', icon: 'sync-alt' },
    { code: 'MENU_CHEQUEBOOK', label: 'Cheque Book', icon: 'book' },
    { code: 'MENU_LETTER_MGMT', label: 'Documents Hub', icon: 'envelope' }
  ];

  apiKey = '';
  tenants: TenantOption[] = [];
  selectedTenant = '';
  rows: MenuRow[] = [];

  loadingTenants = false;
  loadingMenus = false;
  saving = false;
  error: string | null = null;
  savedMessage: string | null = null;

  constructor() {
    this.apiKey = localStorage.getItem(PlatformMenuAccessComponent.KEY_STORAGE) ?? '';
  }

  private headers(tenantForFilter?: string): Record<string, string> {
    return {
      'X-Api-Key': this.apiKey,
      // Any real tenant satisfies the platform's tenant-resolution filter; the target tenant for
      // read/write is this header's own value, so it is set to whichever tenant is actually in play.
      'Fineract-Platform-TenantId':
        tenantForFilter || this.selectedTenant || this.tenants[0]?.identifier || environment.fineractPlatformTenantId
    };
  }

  private apiUrl(path: string): string {
    return `${environment.serverUrl}${path}`;
  }

  rememberKey(): void {
    localStorage.setItem(PlatformMenuAccessComponent.KEY_STORAGE, this.apiKey);
  }

  async loadTenants(): Promise<void> {
    this.error = null;
    this.savedMessage = null;
    if (!this.apiKey.trim()) {
      this.error = 'Enter the platform API key first.';
      return;
    }
    this.rememberKey();
    this.loadingTenants = true;
    try {
      const res = await fetch(this.apiUrl('/tenant-menu-access/tenants'), {
        headers: this.headers(environment.fineractPlatformTenantId)
      });
      if (!res.ok) {
        throw new Error(
          res.status === 403 || res.status === 401 ? 'Invalid or inactive API key.' : `Server error (${res.status}).`
        );
      }
      this.tenants = await res.json();
      if (this.tenants.length > 0 && !this.selectedTenant) {
        this.selectedTenant = this.tenants[0].identifier;
        await this.loadMenusForSelectedTenant();
      }
    } catch (e: any) {
      this.error = e?.message ?? 'Could not load the tenant list.';
      this.tenants = [];
    } finally {
      this.loadingTenants = false;
    }
  }

  async loadMenusForSelectedTenant(): Promise<void> {
    this.error = null;
    this.savedMessage = null;
    if (!this.selectedTenant) {
      return;
    }
    this.loadingMenus = true;
    try {
      const res = await fetch(this.apiUrl('/tenant-menu-access'), { headers: this.headers() });
      if (!res.ok) {
        throw new Error(`Could not read this tenant's menu list (${res.status}).`);
      }
      const saved: { menuCode: string; enabled: boolean }[] = await res.json();
      const enabledByCode = new Map(
        saved.map((r) => [
          r.menuCode,
          r.enabled
        ])
      );
      // A code the tenant has never had a row saved for yet reads as enabled — matches the backend's
      // own default (0541 seeds every existing tenant with everything on), so a freshly onboarded
      // bank that nobody has touched here shows its real, unrestricted state, not a false "all off".
      this.rows = PlatformMenuAccessComponent.ALL_MENUS.map((m) => ({
        code: m.code,
        label: m.label,
        icon: m.icon,
        enabled: enabledByCode.has(m.code) ? !!enabledByCode.get(m.code) : true
      }));
    } catch (e: any) {
      this.error = e?.message ?? "Could not load this tenant's menu list.";
      this.rows = [];
    } finally {
      this.loadingMenus = false;
    }
  }

  async save(): Promise<void> {
    this.error = null;
    this.savedMessage = null;
    this.saving = true;
    try {
      const body = this.rows.map((r) => ({ menuCode: r.code, enabled: r.enabled }));
      const res = await fetch(this.apiUrl('/tenant-menu-access'), {
        method: 'PUT',
        headers: { ...this.headers(), 'Content-Type': 'application/json' },
        body: JSON.stringify(body)
      });
      if (!res.ok) {
        throw new Error(`Save failed (${res.status}).`);
      }
      this.savedMessage = `Saved for "${this.selectedTenant}".`;
    } catch (e: any) {
      this.error = e?.message ?? 'Could not save.';
    } finally {
      this.saving = false;
    }
  }

  setAll(enabled: boolean): void {
    this.rows = this.rows.map((r) => ({ ...r, enabled }));
  }

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

  get selectedTenantName(): string {
    return this.tenants.find((t) => t.identifier === this.selectedTenant)?.name ?? this.selectedTenant;
  }
}