/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import {Inject, Injectable} from '@angular/core';
import {HttpClient} from '../http/http.service';
import {Ledger} from './domain/ledger.model';
import {Observable} from 'rxjs/Observable';
import {Account} from './domain/account.model';
import {RequestOptionsArgs, URLSearchParams} from '@angular/http';
import {AccountCommand} from './domain/account-command.model';
import {JournalEntry} from './domain/journal-entry.model';
import {TrialBalance} from './domain/trial-balance.model';
import {AccountEntryPage} from './domain/account-entry-page.model';
import {AccountPage} from './domain/account-page.model';
import {FetchRequest} from '../domain/paging/fetch-request.model';
import {buildDateRangeParam, buildSearchParams} from '../domain/paging/search-param.builder';
import {LedgerPage} from './domain/ledger-page.model';
import {ChartOfAccountEntry} from './domain/chart-of-account-entry.model';
import {TransactionType} from './domain/transaction-type.model';
import {TransactionTypePage} from './domain/transaction-type-page.model';
import {AccountType} from './domain/account-type.model';
import {IncomeStatement} from './domain/income-statement.model';
import {FinancialCondition} from './domain/financial-condition.model';

@Injectable()
export class AccountingService {

  constructor(private http: HttpClient, @Inject('accountingBaseUrl') private baseUrl: string) {
  }

  public createLedger(ledger: Ledger): Observable<void> {
    return this.http.post(`${this.baseUrl}/ledgers`, ledger);
  }

  public fetchLedgers(includeSubLedgers = false, fetchRequest?: FetchRequest, type?: AccountType): Observable<LedgerPage> {
    const params: URLSearchParams = buildSearchParams(fetchRequest);

    params.append('includeSubLedgers', String(includeSubLedgers));
    params.append('type', type);

    const requestOptions: RequestOptionsArgs = {
      params
    };

    return this.http.get(`${this.baseUrl}/ledgers`, requestOptions);
  }

  public findLedger(identifier: string, silent?: boolean): Observable<Ledger> {
    return this.http.get(`${this.baseUrl}/ledgers/${identifier}`, {}, silent);
  }

  public addSubLedger(identifier: string, subLedger: Ledger): Observable<void> {
    return this.http.post(`${this.baseUrl}/ledgers/${identifier}`, subLedger);
  }

  public modifyLedger(ledger: Ledger): Observable<void> {
    return this.http.put(`${this.baseUrl}/ledgers/${ledger.identifier}`, ledger);
  }

  public deleteLedger(identifier: string): Observable<void> {
    return this.http.delete(`${this.baseUrl}/ledgers/${identifier}`);
  }

  public fetchAccountsOfLedger(identifier: string, fetchRequest?: FetchRequest): Observable<AccountPage> {
    const params: URLSearchParams = buildSearchParams(fetchRequest);

    const requestOptions: RequestOptionsArgs = {
      params
    };
    return this.http.get(`${this.baseUrl}/ledgers/${identifier}/accounts`, requestOptions);
  }

  public createAccount(account: Account): Observable<void> {
    return this.http.post(`${this.baseUrl}/accounts`, account);
  }

  public fetchAccounts(fetchRequest?: FetchRequest, type?: AccountType): Observable<AccountPage> {
    const params: URLSearchParams = buildSearchParams(fetchRequest);

    params.append('type', type);

    const requestOptions: RequestOptionsArgs = {
      params
    };
    return this.http.get(`${this.baseUrl}/accounts`, requestOptions)
      .share();
  }

  public findAccount(identifier: string, silent?: boolean): Observable<Account> {
    return this.http.get(`${this.baseUrl}/accounts/${identifier}`, {}, silent);
  }

  public modifyAccount(account: Account): Observable<void> {
    return this.http.put(`${this.baseUrl}/accounts/${account.identifier}`, account);
  }

  public deleteAccount(account: Account): Observable<void> {
    return this.http.delete(`${this.baseUrl}/accounts/${account.identifier}`);
  }

  public fetchAccountEntries(identifier: string, startDate: string, endDate: string,
                             fetchRequest?: FetchRequest): Observable<AccountEntryPage> {
    const params: URLSearchParams = buildSearchParams(fetchRequest);
    const dateRange = buildDateRangeParam(startDate, endDate);
    params.append('dateRange', dateRange);

    const requestOptions: RequestOptionsArgs = {
      params
    };
    return this.http.get(`${this.baseUrl}/accounts/${identifier}/entries`, requestOptions);
  }

  public fetchAccountCommands(identifier: string): Observable<AccountCommand[]> {
    return this.http.get(`${this.baseUrl}/accounts/${identifier}/commands`);
  }

  public accountCommand(identifier: string, command: AccountCommand): Observable<void> {
    return this.http.post(`${this.baseUrl}/accounts/${identifier}/commands`, command);
  }

  public createJournalEntry(journalEntry: JournalEntry): Observable<void> {
    return this.http.post(`${this.baseUrl}/journal`, journalEntry);
  }

  public fetchJournalEntries(startDate: string, endDate: string, account?: string, amount?: string): Observable<JournalEntry[]> {
    const params: URLSearchParams = new URLSearchParams();

    params.append('dateRange', buildDateRangeParam(startDate, endDate));
    params.append('account', account && account.length > 0 ? account : undefined);
    params.append('amount', amount && amount.length > 0 ? amount : undefined);

    const requestOptions: RequestOptionsArgs = {
      params
    };
    return this.http.get(`${this.baseUrl}/journal`, requestOptions);
  }

  public findJournalEntry(transactionIdentifier: string): Observable<JournalEntry> {
    return this.http.get(`${this.baseUrl}/journal/${transactionIdentifier}`);
  }

  public getTrialBalance(includeEmptyEntries?: boolean): Observable<TrialBalance> {
    const params: URLSearchParams = new URLSearchParams();
    params.append('includeEmptyEntries', includeEmptyEntries ? 'true' : 'false');

    const requestOptions: RequestOptionsArgs = {
      params
    };
    return this.http.get(`${this.baseUrl}/trialbalance`, requestOptions);
  }

  public getChartOfAccounts(): Observable<ChartOfAccountEntry[]> {
    return this.http.get(`${this.baseUrl}/chartofaccounts`);
  }

  public findTransactionType(code: string, silent?: boolean): Observable<Account> {
    return this.http.get(`${this.baseUrl}/transactiontypes/${code}`, {}, silent);
  }

  public createTransactionType(transactionType: TransactionType): Observable<void> {
    return this.http.post(`${this.baseUrl}/transactiontypes`, transactionType);
  }

  public fetchTransactionTypes(fetchRequest?: FetchRequest): Observable<TransactionTypePage> {
    const params: URLSearchParams = buildSearchParams(fetchRequest);

    const requestOptions: RequestOptionsArgs = {
      params
    };

    return this.http.get(`${this.baseUrl}/transactiontypes`, requestOptions);
  }

  public changeTransactionType(transactionType: TransactionType): Observable<void> {
    return this.http.put(`${this.baseUrl}/transactiontypes/${transactionType.code}`, transactionType);
  }

  public getIncomeStatement(): Observable<IncomeStatement> {
    return this.http.get(`${this.baseUrl}/incomestatement`);
  }

  public getFinancialCondition(): Observable<FinancialCondition> {
    return this.http.get(`${this.baseUrl}/financialcondition`);
  }

}