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

import { ImpsEntryComponent } from '../imps-entry/imps-entry.component';

/** Person-to-Account, Person-to-Person (MMID+Mobile), Person-to-Aadhaar. */
export type ImpsTxnType = 'P2A' | 'P2P' | 'P2AADHAAR';
export type ImpsState = 'INITIATED' | 'SENT' | 'SUCCESS' | 'PENDING' | 'FAILED' | 'REVERSED';

export interface ImpsTxn {
  rrn: string;
  utr: string;
  remitterAcc: string;
  remitterBranch: string;
  remitterUser: string;
  remitterChannel: 'BRANCH' | 'MOBILE';
  /** P2A populates these. */
  beneAcc?: string;
  beneIfsc?: string;
  /** P2P populates these. */
  beneMmid?: string;
  beneMobile?: string;
  /** P2AADHAAR populates this. */
  beneAadhaar?: string;
  beneName: string;
  beneBank: string;
  txnType: ImpsTxnType;
  amount: number;
  valueDate: string;
  purposeCode: string;
  state: ImpsState;
  failureCode?: string;
  failureReason?: string;
  sentTimestamp: string;
}

type ReportTab = 'trends' | 'bank' | 'date' | 'pending' | 'channel' | 'user';

interface BankRow {
  bank: string;
  count: number;
  amount: number;
  success: number;
  pending: number;
  failed: number;
}

interface DateRow {
  date: string;
  count: number;
  amount: number;
  p2a: number;
  p2p: number;
}

interface UserRow {
  user: string;
  count: number;
  amount: number;
  branch: string;
}

interface ChannelRow {
  channel: 'BRANCH' | 'MOBILE';
  count: number;
  amount: number;
  share: number;
}

@Component({
  selector: 'mifosx-imps-report',
  templateUrl: './imps-report.component.html',
  styleUrls: ['../neft-rtgs-report/neft-rtgs-report.component.scss'],
  imports: [
    ...STANDALONE_SHARED_IMPORTS,
    FormsModule,
    FaIconComponent,
    MatTooltip
  ]
})
export class ImpsReportComponent implements OnInit {
  private dialog = inject(MatDialog);

  activeTab: ReportTab = 'trends';

  search = '';
  typeFilter: '' | ImpsTxnType = '';
  stateFilter: '' | ImpsState = '';

  txns: ImpsTxn[] = [];

  readonly tabs: { id: ReportTab; label: string; icon: string }[] = [
    { id: 'trends', label: 'Trends', icon: 'chart-line' },
    { id: 'bank', label: 'Bank-wise', icon: 'university' },
    { id: 'date', label: 'Date-wise', icon: 'calendar-alt' },
    { id: 'pending', label: 'Success / Pending / Failed', icon: 'tasks' },
    { id: 'channel', label: 'Branch / Mobile', icon: 'mobile-alt' },
    { id: 'user', label: 'User-wise', icon: 'user-tie' }
  ];

  ngOnInit(): void {
    this.txns = seedImpsTransactions();
  }

  // ───────────────────── KPIs ─────────────────────
  get totalCount(): number {
    return this.txns.length;
  }
  get totalAmount(): number {
    return this.txns.reduce((s, t) => s + t.amount, 0);
  }
  get successCount(): number {
    return this.txns.filter((t) => t.state === 'SUCCESS').length;
  }
  get pendingCount(): number {
    return this.txns.filter((t) => [
        'INITIATED',
        'SENT',
        'PENDING'
      ].includes(t.state)).length;
  }
  get failedCount(): number {
    return this.txns.filter((t) => t.state === 'FAILED' || t.state === 'REVERSED').length;
  }
  get p2aCount(): number {
    return this.txns.filter((t) => t.txnType === 'P2A').length;
  }
  get p2pCount(): number {
    return this.txns.filter((t) => t.txnType === 'P2P').length;
  }
  get successRate(): number {
    if (this.totalCount === 0) return 0;
    return (this.successCount / this.totalCount) * 100;
  }
  get avgTicket(): number {
    if (this.totalCount === 0) return 0;
    return this.totalAmount / this.totalCount;
  }

  // ───────────────────── Filtered list ─────────────────────
  get filteredTxns(): ImpsTxn[] {
    const q = this.search.trim().toLowerCase();
    return this.txns.filter((t) => {
      if (this.typeFilter && t.txnType !== this.typeFilter) return false;
      if (this.stateFilter && t.state !== this.stateFilter) return false;
      if (!q) return true;
      return (
        t.rrn.toLowerCase().includes(q) ||
        t.utr.toLowerCase().includes(q) ||
        (t.beneAcc || '').toLowerCase().includes(q) ||
        (t.beneIfsc || '').toLowerCase().includes(q) ||
        (t.beneMmid || '').toLowerCase().includes(q) ||
        (t.beneMobile || '').toLowerCase().includes(q) ||
        t.beneName.toLowerCase().includes(q) ||
        t.remitterAcc.toLowerCase().includes(q)
      );
    });
  }

  // ───────────────────── Aggregations ─────────────────────
  get bankRows(): BankRow[] {
    const map = new Map<string, BankRow>();
    for (const t of this.txns) {
      const key = t.beneBank;
      if (!map.has(key)) {
        map.set(key, { bank: key, count: 0, amount: 0, success: 0, pending: 0, failed: 0 });
      }
      const r = map.get(key)!;
      r.count++;
      r.amount += t.amount;
      if (t.state === 'SUCCESS') r.success++;
      else if (t.state === 'FAILED' || t.state === 'REVERSED') r.failed++;
      else r.pending++;
    }
    return Array.from(map.values()).sort((a, b) => b.amount - a.amount);
  }

  get dateRows(): DateRow[] {
    const map = new Map<string, DateRow>();
    for (const t of this.txns) {
      if (!map.has(t.valueDate)) {
        map.set(t.valueDate, { date: t.valueDate, count: 0, amount: 0, p2a: 0, p2p: 0 });
      }
      const r = map.get(t.valueDate)!;
      r.count++;
      r.amount += t.amount;
      if (t.txnType === 'P2A') r.p2a++;
      else if (t.txnType === 'P2P') r.p2p++;
    }
    return Array.from(map.values()).sort((a, b) => (a.date < b.date ? 1 : -1));
  }

  get userRows(): UserRow[] {
    const map = new Map<string, UserRow>();
    for (const t of this.txns) {
      const key = `${t.remitterUser}|${t.remitterBranch}`;
      if (!map.has(key)) {
        map.set(key, { user: t.remitterUser, branch: t.remitterBranch, count: 0, amount: 0 });
      }
      const r = map.get(key)!;
      r.count++;
      r.amount += t.amount;
    }
    return Array.from(map.values()).sort((a, b) => b.amount - a.amount);
  }

  get channelRows(): ChannelRow[] {
    const total = this.totalAmount || 1;
    const map = new Map<'BRANCH' | 'MOBILE', ChannelRow>();
    for (const t of this.txns) {
      if (!map.has(t.remitterChannel)) {
        map.set(t.remitterChannel, { channel: t.remitterChannel, count: 0, amount: 0, share: 0 });
      }
      const r = map.get(t.remitterChannel)!;
      r.count++;
      r.amount += t.amount;
    }
    map.forEach((r) => (r.share = (r.amount / total) * 100));
    return Array.from(map.values());
  }

  get trendBuckets(): DateRow[] {
    return this.dateRows.slice(0, 7).reverse();
  }

  get trendMaxAmount(): number {
    const buckets = this.trendBuckets;
    if (!buckets.length) return 1;
    return Math.max(...buckets.map((b) => b.amount));
  }

  get failureCodeRows(): { code: string; reason: string; count: number; amount: number }[] {
    const map = new Map<string, { code: string; reason: string; count: number; amount: number }>();
    for (const t of this.txns) {
      if (!(t.state === 'FAILED' || t.state === 'REVERSED') || !t.failureCode) continue;
      if (!map.has(t.failureCode)) {
        map.set(t.failureCode, {
          code: t.failureCode,
          reason: t.failureReason || '',
          count: 0,
          amount: 0
        });
      }
      const r = map.get(t.failureCode)!;
      r.count++;
      r.amount += t.amount;
    }
    return Array.from(map.values()).sort((a, b) => b.count - a.count);
  }

  // ───────────────────── Actions ─────────────────────
  showTab(tab: ReportTab): void {
    this.activeTab = tab;
  }

  openInitiateDialog(): void {
    const ref = this.dialog.open(ImpsEntryComponent, {
      width: '880px',
      maxWidth: '94vw',
      maxHeight: '88vh',
      disableClose: true,
      autoFocus: false,
      restoreFocus: true,
      panelClass: 'nr-entry-dialog',
      backdropClass: 'nr-entry-backdrop'
    });
    ref.afterClosed().subscribe((result) => {
      if (result && result.submitted && result.payload) {
        this.txns = [
          this.toTxn(result.payload),
          ...this.txns
        ];
      }
    });
  }

  exportCsv(): void {
    const headers = [
      'RRN',
      'UTR',
      'Remitter Acc',
      'Bene Acc / MMID / Aadhaar',
      'Bene IFSC / Mobile',
      'Bene Name',
      'Txn Type',
      'Amount',
      'Value Date',
      'Purpose Code',
      'State',
      'Failure Code',
      'Sent Timestamp'
    ];
    const rows: string[][] = [headers];
    for (const t of this.filteredTxns) {
      rows.push([
        t.rrn,
        t.utr,
        t.remitterAcc,
        t.beneAcc || t.beneMmid || t.beneAadhaar || '',
        t.beneIfsc || t.beneMobile || '',
        t.beneName,
        t.txnType,
        t.amount.toFixed(2),
        t.valueDate,
        t.purposeCode,
        t.state,
        t.failureCode || '',
        t.sentTimestamp
      ]);
    }
    const escape = (v: string): string => {
      const s = (v || '').replace(/"/g, '""');
      return /[,"\n]/.test(s) ? `"${s}"` : s;
    };
    const csv = rows.map((r) => r.map(escape).join(',')).join('\n') + '\n';
    const blob = new Blob([csv], { type: 'text/csv;charset=utf-8' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = `IMPS_Report_${new Date().toISOString().slice(0, 10)}.csv`;
    a.click();
    URL.revokeObjectURL(url);
  }

  clearFilters(): void {
    this.search = '';
    this.typeFilter = '';
    this.stateFilter = '';
  }

  // ───────────────────── Helpers ─────────────────────
  stateColor(state: ImpsState): string {
    switch (state) {
      case 'SUCCESS':
        return 'green';
      case 'FAILED':
      case 'REVERSED':
        return 'red';
      case 'SENT':
        return 'blue';
      case 'INITIATED':
        return 'teal';
      case 'PENDING':
        return 'amber';
    }
  }

  trendBarHeight(amount: number): number {
    return Math.max(6, Math.round((amount / this.trendMaxAmount) * 100));
  }

  private toTxn(p: any): ImpsTxn {
    const valueDate = p.valueDate
      ? new Date(p.valueDate).toISOString().slice(0, 10)
      : new Date().toISOString().slice(0, 10);
    const ts = new Date();
    const pad = (n: number) => String(n).padStart(2, '0');
    return {
      rrn: 'IMPS' + Date.now().toString().slice(-10),
      utr: 'UTR' + Date.now().toString().slice(-11),
      remitterAcc: p.senderAccount || '',
      remitterBranch: 'Main Branch',
      remitterUser: 'Current User',
      remitterChannel: 'BRANCH',
      beneAcc: p.beneficiaryAccount,
      beneIfsc: (p.ifscCode || '').toUpperCase() || undefined,
      beneMmid: p.beneMmid,
      beneMobile: p.beneMobile,
      beneAadhaar: p.beneAadhaar,
      beneName: p.beneficiaryName || '',
      beneBank: this.bankFromIfsc(p.ifscCode || ''),
      txnType: p.txnType || 'P2A',
      amount: Number(p.amount) || 0,
      valueDate,
      purposeCode: this.purposeCodeFor(p.purposeOfRemittance),
      state: 'INITIATED',
      sentTimestamp:
        ts.getFullYear() +
        '-' +
        pad(ts.getMonth() + 1) +
        '-' +
        pad(ts.getDate()) +
        ' ' +
        pad(ts.getHours()) +
        ':' +
        pad(ts.getMinutes()) +
        ':' +
        pad(ts.getSeconds())
    };
  }

  private bankFromIfsc(ifsc: string): string {
    const code = ifsc.slice(0, 4).toUpperCase();
    const map: Record<string, string> = {
      HDFC: 'HDFC Bank',
      ICIC: 'ICICI Bank',
      SBIN: 'State Bank of India',
      KKBK: 'Kotak Mahindra Bank',
      AXIS: 'Axis Bank',
      UTIB: 'Axis Bank',
      PUNB: 'Punjab National Bank',
      BARB: 'Bank of Baroda',
      CNRB: 'Canara Bank',
      YESB: 'YES Bank',
      IDFB: 'IDFC FIRST Bank'
    };
    return map[code] || code + ' Bank';
  }

  private purposeCodeFor(p: string): string {
    const map: Record<string, string> = {
      CAPITAL_TRANSFER: 'P0102',
      FAMILY_MAINTENANCE: 'P1301',
      TRADE_SETTLEMENT: 'P0801',
      SALARY_PAYMENT: 'P1006',
      LOAN_REPAYMENT: 'P0103',
      TAX_PAYMENT: 'P1099',
      VENDOR_PAYMENT: 'P0802',
      INVESTMENT: 'P0202',
      GIFT: 'P1302',
      OTHER: 'P0099'
    };
    return map[p] || 'P0099';
  }

  // ───────────────────── Mock seed data ─────────────────────
  /** @deprecated Use the exported `seedImpsTransactions()` instead. */
  private seedTransactions(): ImpsTxn[] {
    return seedImpsTransactions();
  }
}

// ───────────────────── Shared mock seed (top-level export) ─────────────────────
/**
 * Mock IMPS history. Exported so the entry form (and any per-sender history dialogs)
 * can render from the same dataset. Replace with an API call when the back-end is wired.
 */
export function seedImpsTransactions(): ImpsTxn[] {
  const today = new Date();
  const dt = (offset: number, h = 10, m = 0): string => {
    const d = new Date(today);
    d.setDate(d.getDate() - offset);
    const pad = (n: number) => String(n).padStart(2, '0');
    return d.getFullYear() + '-' + pad(d.getMonth() + 1) + '-' + pad(d.getDate()) + ' ' + pad(h) + ':' + pad(m) + ':00';
  };
  const vd = (offset: number): string => dt(offset).slice(0, 10);

  return [
    {
      rrn: 'IMPS2608517721',
      utr: 'UTRKKBK52026081',
      remitterAcc: '50200012345678',
      remitterBranch: 'Mumbai — BKC',
      remitterUser: 'Anita Desai',
      remitterChannel: 'MOBILE',
      beneMmid: '9234567',
      beneMobile: '9821234567',
      beneName: 'Rohan S. Mehta',
      beneBank: 'HDFC Bank',
      txnType: 'P2P',
      amount: 12500,
      valueDate: vd(0),
      purposeCode: 'P1301',
      state: 'SUCCESS',
      sentTimestamp: dt(0, 14, 5)
    },
    {
      rrn: 'IMPS2608517722',
      utr: 'UTRHDFC2608712',
      remitterAcc: '50200012345678',
      remitterBranch: 'Mumbai — BKC',
      remitterUser: 'Anita Desai',
      remitterChannel: 'BRANCH',
      beneAcc: '345678901234',
      beneIfsc: 'ICIC0000567',
      beneName: 'Bluestone Trading Co.',
      beneBank: 'ICICI Bank',
      txnType: 'P2A',
      amount: 78500,
      valueDate: vd(0),
      purposeCode: 'P0802',
      state: 'SENT',
      sentTimestamp: dt(0, 14, 6)
    },
    {
      rrn: 'IMPS2608517723',
      utr: 'UTRSBIN2608902',
      remitterAcc: '50200099887766',
      remitterBranch: 'Bengaluru — MG Road',
      remitterUser: 'Karthik Rao',
      remitterChannel: 'MOBILE',
      beneMmid: '9128831',
      beneMobile: '9845112233',
      beneName: 'Anita Verma',
      beneBank: 'State Bank of India',
      txnType: 'P2P',
      amount: 4500,
      valueDate: vd(1),
      purposeCode: 'P1301',
      state: 'SUCCESS',
      sentTimestamp: dt(1, 11, 22)
    },
    {
      rrn: 'IMPS2608517724',
      utr: 'UTRAXIS2608811',
      remitterAcc: '50200099887766',
      remitterBranch: 'Bengaluru — MG Road',
      remitterUser: 'Karthik Rao',
      remitterChannel: 'MOBILE',
      beneAcc: '6789012345',
      beneIfsc: 'UTIB0000456',
      beneName: 'Rakesh Industries',
      beneBank: 'Axis Bank',
      txnType: 'P2A',
      amount: 195000,
      valueDate: vd(1),
      purposeCode: 'P0801',
      state: 'FAILED',
      failureCode: 'E03',
      failureReason: 'Beneficiary Bank Not Available',
      sentTimestamp: dt(1, 11, 25)
    },
    {
      rrn: 'IMPS2608517725',
      utr: 'UTRPUNB2608619',
      remitterAcc: '50100221122334',
      remitterBranch: 'Delhi — Connaught',
      remitterUser: 'Sushma Iyer',
      remitterChannel: 'BRANCH',
      beneAcc: '50100998877665',
      beneIfsc: 'PUNB0123400',
      beneName: 'Madhavi Singh',
      beneBank: 'Punjab National Bank',
      txnType: 'P2A',
      amount: 42000,
      valueDate: vd(2),
      purposeCode: 'P1006',
      state: 'SUCCESS',
      sentTimestamp: dt(2, 9, 35)
    },
    {
      rrn: 'IMPS2608517726',
      utr: 'UTRYESB2608520',
      remitterAcc: '50100221122334',
      remitterBranch: 'Delhi — Connaught',
      remitterUser: 'Sushma Iyer',
      remitterChannel: 'BRANCH',
      beneMmid: '9001122',
      beneMobile: '9818877665',
      beneName: 'Sigma Constructions',
      beneBank: 'YES Bank',
      txnType: 'P2P',
      amount: 18500,
      valueDate: vd(2),
      purposeCode: 'P0102',
      state: 'PENDING',
      sentTimestamp: dt(2, 9, 38)
    },
    {
      rrn: 'IMPS2608517727',
      utr: 'UTRCNRB2608417',
      remitterAcc: '50100887766554',
      remitterBranch: 'Chennai — T. Nagar',
      remitterUser: 'Ramesh Krishnan',
      remitterChannel: 'MOBILE',
      beneMmid: '9889911',
      beneMobile: '9840012345',
      beneName: 'Padma Rao',
      beneBank: 'Canara Bank',
      txnType: 'P2P',
      amount: 2800,
      valueDate: vd(3),
      purposeCode: 'P1302',
      state: 'SUCCESS',
      sentTimestamp: dt(3, 16, 15)
    },
    {
      rrn: 'IMPS2608517728',
      utr: 'UTRBARB2608318',
      remitterAcc: '50100887766554',
      remitterBranch: 'Chennai — T. Nagar',
      remitterUser: 'Ramesh Krishnan',
      remitterChannel: 'BRANCH',
      beneAcc: '50100123456987',
      beneIfsc: 'BARB0VJVATA',
      beneName: 'Vijaya Traders',
      beneBank: 'Bank of Baroda',
      txnType: 'P2A',
      amount: 125000,
      valueDate: vd(3),
      purposeCode: 'P0802',
      state: 'INITIATED',
      sentTimestamp: dt(3, 16, 20)
    },
    {
      rrn: 'IMPS2608517729',
      utr: 'UTRIDFB2608215',
      remitterAcc: '50200445566778',
      remitterBranch: 'Pune — Koregaon Park',
      remitterUser: 'Vikram Joshi',
      remitterChannel: 'BRANCH',
      beneAadhaar: 'XXXX-XXXX-7891',
      beneName: 'Pinnacle Realty Pvt Ltd',
      beneBank: 'IDFC FIRST Bank',
      txnType: 'P2AADHAAR',
      amount: 145000,
      valueDate: vd(4),
      purposeCode: 'P0202',
      state: 'SUCCESS',
      sentTimestamp: dt(4, 12, 45)
    },
    {
      rrn: 'IMPS2608517730',
      utr: 'UTRHDFC2608116',
      remitterAcc: '50200445566778',
      remitterBranch: 'Pune — Koregaon Park',
      remitterUser: 'Vikram Joshi',
      remitterChannel: 'MOBILE',
      beneMmid: '9650432',
      beneMobile: '9890065432',
      beneName: 'Neha Kapoor',
      beneBank: 'HDFC Bank',
      txnType: 'P2P',
      amount: 6500,
      valueDate: vd(4),
      purposeCode: 'P1301',
      state: 'SUCCESS',
      sentTimestamp: dt(4, 12, 50)
    },
    {
      rrn: 'IMPS2608517731',
      utr: 'UTRKKBK2608013',
      remitterAcc: '50200778899001',
      remitterBranch: 'Hyderabad — Banjara',
      remitterUser: 'Lakshmi Naidu',
      remitterChannel: 'BRANCH',
      beneAcc: '12345678900011',
      beneIfsc: 'KKBK0001899',
      beneName: 'Aarav Enterprises',
      beneBank: 'Kotak Mahindra Bank',
      txnType: 'P2A',
      amount: 67000,
      valueDate: vd(5),
      purposeCode: 'P0802',
      state: 'REVERSED',
      failureCode: 'E11',
      failureReason: 'Beneficiary Account Closed',
      sentTimestamp: dt(5, 10, 5)
    },
    {
      rrn: 'IMPS2608517732',
      utr: 'UTRSBIN2607914',
      remitterAcc: '50200778899001',
      remitterBranch: 'Hyderabad — Banjara',
      remitterUser: 'Lakshmi Naidu',
      remitterChannel: 'BRANCH',
      beneMmid: '9445566',
      beneMobile: '9849988776',
      beneName: 'Spectra Components',
      beneBank: 'State Bank of India',
      txnType: 'P2P',
      amount: 9800,
      valueDate: vd(5),
      purposeCode: 'P0801',
      state: 'SUCCESS',
      sentTimestamp: dt(5, 10, 10)
    },
    {
      rrn: 'IMPS2608517733',
      utr: 'UTRICIC2607812',
      remitterAcc: '50100334455667',
      remitterBranch: 'Kolkata — Park Street',
      remitterUser: 'Arjun Banerjee',
      remitterChannel: 'MOBILE',
      beneAcc: '88990011223344',
      beneIfsc: 'ICIC0001234',
      beneName: 'Eastern Logistics',
      beneBank: 'ICICI Bank',
      txnType: 'P2A',
      amount: 88000,
      valueDate: vd(6),
      purposeCode: 'P0802',
      state: 'SUCCESS',
      sentTimestamp: dt(6, 14, 30)
    },
    {
      rrn: 'IMPS2608517734',
      utr: 'UTRAXIS2607711',
      remitterAcc: '50100334455667',
      remitterBranch: 'Kolkata — Park Street',
      remitterUser: 'Arjun Banerjee',
      remitterChannel: 'BRANCH',
      beneMmid: '9009988',
      beneMobile: '9831100225',
      beneName: 'Indrani Sen',
      beneBank: 'Axis Bank',
      txnType: 'P2P',
      amount: 2200,
      valueDate: vd(6),
      purposeCode: 'P1302',
      state: 'SUCCESS',
      sentTimestamp: dt(6, 14, 32)
    }
  ];
}