import { Component, OnInit } from '@angular/core';
import { Logger } from '../core/logger';
import { TransactionService } from '../core/transaction.service';
import { AccountService } from '../core/account.service';
import { OrgService } from '../core/org.service';
import { SessionService } from '../core/session.service';
import { Transaction, Split } from '../shared/transaction';
import { Org } from '../shared/org';
import { Account, AccountTree } from '../shared/account';
import { Util } from '../shared/util';
import { TxListPage } from '../transaction/list';
import { IncomeReport } from '../reports/income';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/take';

class RecentTx {
  split: Split;
  account: Account;
  tx: Transaction;
  hidden: boolean;
}

@Component({
 selector: 'app-dashboard',
 templateUrl: 'dashboard.html',
 styleUrls: ['./dashboard.scss']
})
export class DashboardPage implements OnInit {
  public org: Org;
  public expenseAmount: number;
  public budgetExpanded: boolean = false;
  public recentExpanded: boolean = false;
  public expenseAccounts: Account[] = [];
  public hiddenExpenses: any = {};
  public recentTxs: RecentTx[];
  private numBudgetItems: number = 5;
  private numSplits: number = 5;

  constructor(
    private log: Logger,
    private txService: TransactionService,
    private accountService: AccountService,
    private orgService: OrgService,
    private sessionService: SessionService) {
  }

  ngOnInit() {
    this.sessionService.setLoading(true);
    this.log.debug('dashboard init');

    this.org = this.orgService.getCurrentOrg();
    this.log.debug('org', this.org);

    let periodStart = Util.getPeriodStart(this.org.timezone);

    let tree$ = this.accountService.getAccountTreeWithPeriodBalance(periodStart);

    tree$.do(tree => {
      let expenses = tree.getAccountByName('Expenses', 1);

      this.expenseAmount = expenses.totalNativeBalanceCost;

      this.expenseAccounts = tree.getFlattenedAccounts().filter(account => {
        return tree.accountIsChildOf(account, expenses) && account.recentTxCount;
      }).sort((a, b) => {
        return b.recentTxCount - a.recentTxCount;
      }).slice(0, this.numBudgetItems * 2);

      this.hiddenExpenses = {};

      this.expenseAccounts.forEach((account, index) => {
        if(index >= this.numBudgetItems) {
          this.hiddenExpenses[account.id] = true;
        }
      });
    })
    .switchMap(tree => {
      let expenses = tree.getAccountByName('Expenses', 1);
      let income = tree.getAccountByName('Income', 1);

      return this.txService.getLastTransactions(this.numSplits * 4).take(1)
        .map(txs => {
          this.log.debug('lastTxs');
          this.log.debug(txs);
          return txs.map(tx => {
            let splits = tx.splits.filter(split => {
              let account = tree.accountMap[split.accountId];
              if(!account || !split.amount) {
                return false;
              }

              return tree.accountIsChildOf(account, expenses) || tree.accountIsChildOf(account, income);
            });

            // If it's not an income or expense transaction but it has 2 splits we can still display something
            if(!splits.length && tx.splits.length === 2) {
              splits = tx.splits.filter(split => {
                return split.amount < 0;
              });
            }

            return splits.map(split => {
              let recentTx = new RecentTx();
              recentTx.split = split;
              recentTx.account = tree.accountMap[split.accountId];
              recentTx.tx = tx;
              return recentTx;
            });
          }).reduce((acc, recentTxs) => {
            return acc.concat(recentTxs);
          }, [])
        }).map(recentTxs => {
          return recentTxs.slice(0, this.numSplits * 2);
        }).map(recentTxs => {
          return recentTxs.map((recentTx, index) => {
            if(index >= this.numSplits) {
              recentTx.hidden = true;
            }

            return recentTx;
          })
        });
    })
    .subscribe(recentTxs => {
      this.log.debug('recentTxs', recentTxs);
      this.recentTxs = recentTxs;
      this.sessionService.setLoading(false);
    });
  }

  toggleExpandedBudget() {
    this.budgetExpanded = !this.budgetExpanded;
  }

  toggleExpandedRecent() {
    this.recentExpanded = !this.recentExpanded;
  }
}