/**
 * 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 { Injectable, inject } from '@angular/core';
import { HttpClient, HttpErrorResponse } from '@angular/common/http';
import { Observable, forkJoin } from 'rxjs';
import { map, tap } from 'rxjs/operators';
import {
  InstrumentType,
  InvestmentHolding,
  PARTY_MASTER,
  PartyMaster,
  SCRIPT_MASTER,
  ScriptMaster,
  SlrType
} from './investment-data';

/** Investment party as returned by /investment/parties. */
export interface InvestmentPartyDto {
  id: number;
  partyCode: string;
  bondType: InstrumentType;
  partyName: string;
  address1?: string;
  address2?: string;
  address3?: string;
  city?: string;
  pincode?: string;
  phone?: string;
  fax?: string;
  bankType?: string;
  glAccountId: number;
  glCode: string;
  glName: string;
  rbiCode?: string;
  limit?: number;
  leiNo?: string;
  cpBankName?: string;
  cpBranchName?: string;
  cpAccountNo?: string;
  cpIfsc?: string;
  active: boolean;
}

/** Investment script as returned by /investment/scripts (dates are DD-MM-YYYY). */
export interface InvestmentScriptDto {
  id: number;
  scriptCode: string;
  bondType: InstrumentType;
  slrType?: SlrType;
  scriptDesc: string;
  glAccountId: number;
  glCode: string;
  glName: string;
  isin?: string;
  faceValuePerUnit: number;
  intRate?: number;
  issueDate?: string;
  maturityDate?: string;
  companyName?: string;
  address1?: string;
  address2?: string;
  address3?: string;
  city?: string;
  pincode?: string;
  phone?: string;
  fax?: string;
  corpCode?: string;
  active: boolean;
}

/** Purchase entry (holding) as returned by /investment/purchases (dates are DD-MM-YYYY). */
export interface InvestmentPurchaseDto {
  id: number;
  dealNo: string;
  certNo: string;
  bondType: InstrumentType;
  scriptId: number;
  scriptCode: string;
  scriptDesc: string;
  isin?: string;
  partyId: number;
  partyCode: string;
  partyName: string;
  dealDate: string;
  dealTime?: string;
  settlementType: string;
  settlementDate: string;
  faceValue: number;
  purchaseRate: number;
  units: number;
  balanceUnits: number;
  brokerage?: number;
  stampDuty?: number;
  bookValue: number;
  premiumDiscount?: number;
  intRate?: number;
  issueDate?: string;
  maturityDate?: string;
  lastIntDate?: string;
  accruedDays?: number;
  accruedInterest?: number;
  settlementAmount: number;
  ytm?: number;
  category: string;
  subType?: string;
  investmentGlAccountId: number;
  investmentGlCode: string;
  investmentGlName: string;
  crGlAccountId: number;
  crGlCode: string;
  crGlName: string;
  otherDetails?: string;
  status: string;
}

export interface InvestmentGlAccount {
  id: number;
  glCode: string;
  name: string;
}

/**
 * Backend calls for the Investment masters (Bank / Party Master and Script Master). Results are also copied into the
 * shared PARTY_MASTER / SCRIPT_MASTER lists so screens that still read those lists (Purchase Entry) offer the saved
 * masters.
 */
@Injectable({ providedIn: 'root' })
export class InvestmentService {
  private http = inject(HttpClient);

  // -------------------- Bank / Party Master --------------------
  getParties(): Observable<InvestmentPartyDto[]> {
    return this.http.get<InvestmentPartyDto[]>('/investment/parties');
  }

  createParty(body: object): Observable<{ resourceId: number; resourceIdentifier: string }> {
    return this.http.post<{ resourceId: number; resourceIdentifier: string }>('/investment/parties', body);
  }

  updateParty(id: number, body: object): Observable<{ resourceId: number; resourceIdentifier: string }> {
    return this.http.put<{ resourceId: number; resourceIdentifier: string }>(`/investment/parties/${id}`, body);
  }

  deleteParty(id: number): Observable<unknown> {
    return this.http.delete(`/investment/parties/${id}`);
  }

  // -------------------- Script Master --------------------
  getScripts(): Observable<InvestmentScriptDto[]> {
    return this.http.get<InvestmentScriptDto[]>('/investment/scripts');
  }

  createScript(body: object): Observable<{ resourceId: number; resourceIdentifier: string }> {
    return this.http.post<{ resourceId: number; resourceIdentifier: string }>('/investment/scripts', body);
  }

  updateScript(id: number, body: object): Observable<{ resourceId: number; resourceIdentifier: string }> {
    return this.http.put<{ resourceId: number; resourceIdentifier: string }>(`/investment/scripts/${id}`, body);
  }

  // -------------------- Purchase Entry --------------------
  getPurchases(): Observable<InvestmentPurchaseDto[]> {
    return this.http.get<InvestmentPurchaseDto[]>('/investment/purchases');
  }

  /** Coupon and 31 Mar / 30 Sep provision lines of a holding up to maturity (calculated, not posted). */
  getInterestSchedule(purchaseId: number, asOnDate?: string): Observable<InvestmentInterestScheduleDto> {
    const params = asOnDate ? `?asOnDate=${encodeURIComponent(asOnDate)}` : '';
    return this.http.get<InvestmentInterestScheduleDto>(
      `/investment/purchases/${purchaseId}/interest-schedule${params}`
    );
  }

  createPurchase(body: object): Observable<{ resourceId: number; resourceIdentifier: string }> {
    return this.http.post<{ resourceId: number; resourceIdentifier: string }>('/investment/purchases', body);
  }

  deletePurchase(id: number): Observable<unknown> {
    return this.http.delete(`/investment/purchases/${id}`);
  }

  // -------------------- GL accounts --------------------
  /** Enabled ASSET detail GLs — the only kind an investment party / script can be booked to. */
  getAssetGlAccounts(): Observable<InvestmentGlAccount[]> {
    return this.http
      .get<
        Array<{ id: number; glCode: string; name: string; disabled: boolean }>
      >('/glaccounts', { params: { type: '1', usage: '1', disabled: 'false' } })
      .pipe(
        map((list) =>
          list
            .map((g) => ({ id: g.id, glCode: g.glCode, name: g.name }))
            .sort((a, b) => a.glCode.localeCompare(b.glCode))
        )
      );
  }

  /** Loads both masters from the backend and refreshes the shared lists other screens read. */
  syncSharedMasters(): Observable<{ parties: PartyMaster[]; scripts: ScriptMaster[] }> {
    return forkJoin({ parties: this.getParties(), scripts: this.getScripts() }).pipe(
      map(({ parties, scripts }) => ({ parties: parties.map(toPartyMaster), scripts: scripts.map(toScriptMaster) })),
      tap(({ parties, scripts }) => {
        PARTY_MASTER.splice(0, PARTY_MASTER.length, ...parties);
        SCRIPT_MASTER.splice(0, SCRIPT_MASTER.length, ...scripts);
      })
    );
  }
}

export function toPartyMaster(p: InvestmentPartyDto): PartyMaster {
  return {
    id: p.id,
    partyCode: p.partyCode,
    partyName: p.partyName,
    partyType: 'BANK',
    bondType: p.bondType,
    address1: p.address1,
    address2: p.address2,
    address3: p.address3,
    city: p.city,
    pincode: p.pincode,
    phone: p.phone,
    fax: p.fax,
    bankType: p.bankType,
    glAccountId: p.glAccountId,
    glCode: p.glCode,
    glName: p.glName,
    rbiCode: p.rbiCode,
    limit: p.limit ?? null,
    leiNo: p.leiNo,
    cpBankName: p.cpBankName,
    cpBranchName: p.cpBranchName,
    cpAccountNo: p.cpAccountNo,
    cpIfsc: p.cpIfsc,
    status: p.active ? 'ACTIVE' : 'INACTIVE'
  };
}

export function toScriptMaster(s: InvestmentScriptDto): ScriptMaster {
  return {
    id: s.id,
    scriptCode: s.scriptCode,
    scriptName: s.scriptDesc,
    instrumentType: s.bondType,
    isin: s.isin ?? '',
    faceValuePerUnit: s.faceValuePerUnit,
    slrType: s.slrType,
    glAccountId: s.glAccountId,
    glCode: s.glCode,
    glName: s.glName,
    couponRate: s.intRate,
    issueDate: s.issueDate,
    maturityDate: s.maturityDate,
    companyName: s.companyName,
    address1: s.address1,
    address2: s.address2,
    address3: s.address3,
    city: s.city,
    pincode: s.pincode,
    phone: s.phone,
    fax: s.fax,
    corpCode: s.corpCode,
    active: s.active
  };
}

/** A saved purchase as a row of the Holdings register. */
export function toHolding(p: InvestmentPurchaseDto): InvestmentHolding {
  return {
    id: p.id,
    dealNo: p.dealNo,
    certNo: p.certNo,
    instrumentType: p.bondType,
    scriptCode: p.scriptCode,
    scriptName: p.scriptDesc,
    party: p.partyName,
    partyCode: p.partyCode,
    subType: p.subType ?? '',
    faceValue: p.faceValue,
    purchaseRate: p.purchaseRate,
    units: p.balanceUnits,
    purchaseDate: p.settlementDate,
    maturityDate: p.maturityDate || p.dealDate,
    interestRate: p.intRate ?? 0,
    interestFreq: p.bondType === 'MUTUAL_FUND' ? 'CUMULATIVE' : 'HALF_YEARLY',
    glCode: p.investmentGlCode,
    glName: p.investmentGlName,
    crToAc: p.crGlCode,
    brokerCode: '',
    status: 'ACTIVE',
    category: p.category,
    bookValue: p.bookValue,
    settlementAmount: p.settlementAmount
  };
}

/** One line of a holding's interest schedule (see InvestmentInterestScheduleData in the backend). */
export interface InvestmentInterestRowDto {
  type: 'COUPON' | 'PROVISION';
  intDate: string;
  fromDate: string;
  toDate: string;
  days: number;
  grossInterest: number;
  alreadyBooked: number;
  amount: number;
  due: boolean;
}

export interface InvestmentInterestScheduleDto {
  purchaseId: number;
  dealNo: string;
  certNo: string;
  scriptCode: string;
  scriptDesc: string;
  faceValue: number;
  unitValue: number;
  balanceUnits: number;
  purchaseRate: number;
  bookValue: number;
  intRate: number;
  dealDate: string;
  lastIntDate: string;
  maturityDate: string;
  purchasedAccruedInterest: number;
  couponPerHalfYear: number;
  asOnDate: string;
  interestGlCode: string;
  interestGlName: string;
  rows: InvestmentInterestRowDto[];
}

/** The first validation / domain-rule message from a Fineract error response, for a toast. */
export function apiErrorMessage(err: unknown): string {
  const e = err as HttpErrorResponse;
  const body = e?.error;
  return body?.errors?.[0]?.defaultUserMessage || body?.defaultUserMessage || e?.message || 'Request failed.';
}