import { Component, signal, OnInit, OnDestroy, inject } from '@angular/core';
import { CommonModule } from '@angular/common';
import { MatCardModule } from '@angular/material/card';
import { MatIconModule } from '@angular/material/icon';
import { MatButtonModule } from '@angular/material/button';
import { MatTableModule } from '@angular/material/table';
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
import { MatSnackBarModule, MatSnackBar } from '@angular/material/snack-bar';
import { MatTabsModule } from '@angular/material/tabs';
import { ApiService } from '../../services/api.service';
import { interval, Subscription } from 'rxjs';

export interface Position {
  symbol: string;
  quantity: number;
  avgPrice: number;
  currentPrice: number;
  marketValue: number;
  unrealizedPnL: number;
  unrealizedPnLPercent: number;
  dayChange: number;
  dayChangePercent: number;
}

export interface PortfolioSummary {
  totalValue: number;
  totalCost: number;
  totalPnL: number;
  totalPnLPercent: number;
  dayChange: number;
  dayChangePercent: number;
  cash: number;
  positionsCount: number;
}

@Component({
  selector: 'app-portfolio',
  standalone: true,
  imports: [
    CommonModule, 
    MatCardModule, 
    MatIconModule,
    MatButtonModule,
    MatTableModule,
    MatProgressSpinnerModule,
    MatSnackBarModule,
    MatTabsModule
  ],
  templateUrl: './portfolio.component.html',
  styleUrl: './portfolio.component.css'
})
export class PortfolioComponent implements OnInit, OnDestroy {
  private apiService = inject(ApiService);
  private snackBar = inject(MatSnackBar);
  private subscriptions: Subscription[] = [];

  protected portfolioSummary = signal<PortfolioSummary>({
    totalValue: 0,
    totalCost: 0,
    totalPnL: 0,
    totalPnLPercent: 0,
    dayChange: 0,
    dayChangePercent: 0,
    cash: 0,
    positionsCount: 0
  });
  
  protected positions = signal<Position[]>([]);
  protected isLoading = signal<boolean>(true);
  protected error = signal<string | null>(null);
  protected displayedColumns = ['symbol', 'quantity', 'avgPrice', 'currentPrice', 'marketValue', 'unrealizedPnL', 'dayChange'];

  ngOnInit() {
    this.loadPortfolioData();

    // Refresh portfolio data every 30 seconds
    const portfolioSubscription = interval(30000).subscribe(() => {
      this.loadPortfolioData();
    });
    this.subscriptions.push(portfolioSubscription);
  }

  ngOnDestroy() {
    this.subscriptions.forEach(sub => sub.unsubscribe());
  }

  private loadPortfolioData() {
    // Since we don't have a portfolio endpoint yet, let's create mock data
    // In a real implementation, this would call this.apiService.getPortfolio()
    
    setTimeout(() => {
      const mockPositions: Position[] = [
        {
          symbol: 'AAPL',
          quantity: 100,
          avgPrice: 180.50,
          currentPrice: 192.53,
          marketValue: 19253,
          unrealizedPnL: 1203,
          unrealizedPnLPercent: 6.67,
          dayChange: 241,
          dayChangePercent: 1.27
        },
        {
          symbol: 'MSFT',
          quantity: 50,
          avgPrice: 400.00,
          currentPrice: 415.26,
          marketValue: 20763,
          unrealizedPnL: 763,
          unrealizedPnLPercent: 3.82,
          dayChange: 436.50,
          dayChangePercent: 2.15
        },
        {
          symbol: 'GOOGL',
          quantity: 10,
          avgPrice: 2900.00,
          currentPrice: 2847.56,
          marketValue: 28475.60,
          unrealizedPnL: -524.40,
          unrealizedPnLPercent: -1.81,
          dayChange: -123.40,
          dayChangePercent: -0.43
        }
      ];

      const summary: PortfolioSummary = {
        totalValue: mockPositions.reduce((sum, pos) => sum + pos.marketValue, 0) + 25000, // + cash
        totalCost: mockPositions.reduce((sum, pos) => sum + (pos.avgPrice * pos.quantity), 0),
        totalPnL: mockPositions.reduce((sum, pos) => sum + pos.unrealizedPnL, 0),
        totalPnLPercent: 0,
        dayChange: mockPositions.reduce((sum, pos) => sum + pos.dayChange, 0),
        dayChangePercent: 0,
        cash: 25000,
        positionsCount: mockPositions.length
      };

      summary.totalPnLPercent = (summary.totalPnL / summary.totalCost) * 100;
      summary.dayChangePercent = (summary.dayChange / (summary.totalValue - summary.dayChange)) * 100;

      this.positions.set(mockPositions);
      this.portfolioSummary.set(summary);
      this.isLoading.set(false);
      this.error.set(null);
    }, 1000);
  }

  refreshData() {
    this.isLoading.set(true);
    this.loadPortfolioData();
  }

  getPnLColor(value: number): string {
    if (value > 0) return 'text-green-600';
    if (value < 0) return 'text-red-600';
    return 'text-gray-600';
  }
}