import { Component, OnInit } from '@angular/core';
import { Router, ActivatedRoute, RouterLink } from '@angular/router';
import { FormBuilder, ReactiveFormsModule, Validators } from '@angular/forms';
import { MatCardModule } from '@angular/material/card';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatButtonModule } from '@angular/material/button';
import { MatProgressSpinnerModule } from '@angular/material/progress-spinner';
import { AuthService } from '../../core/services/auth.service';
import { NgIf } from '@angular/common';

@Component({
  selector: 'app-login',
  standalone: true,
  imports: [
    RouterLink, ReactiveFormsModule, NgIf,
    MatCardModule, MatFormFieldModule, MatInputModule, MatButtonModule,
    MatProgressSpinnerModule,
  ],
  template: `
    <div class="min-h-screen flex items-center justify-center bg-gray-50 px-4">
      <mat-card class="w-full max-w-md p-8">
        <div class="text-center mb-8">
          <h1 class="text-3xl font-bold text-indigo-600">Indie</h1>
          <p class="text-gray-500 mt-1">Sign in to your account</p>
        </div>

        <div *ngIf="showVerifiedMessage" class="bg-green-50 border border-green-200 text-green-700 text-sm rounded-lg p-3 mb-4">
          Your account is ready. Please sign in.
        </div>

        <form [formGroup]="loginForm" (ngSubmit)="onSubmit()" class="flex flex-col gap-4">
          <mat-form-field appearance="outline" class="w-full">
            <mat-label>Email</mat-label>
            <input matInput type="email" formControlName="email" placeholder="you@example.com" />
            <mat-error *ngIf="loginForm.get('email')?.hasError('required')">Email is required</mat-error>
            <mat-error *ngIf="loginForm.get('email')?.hasError('email')">Invalid email format</mat-error>
          </mat-form-field>

          <mat-form-field appearance="outline" class="w-full">
            <mat-label>Password</mat-label>
            <input matInput type="password" formControlName="password" />
            <mat-error *ngIf="loginForm.get('password')?.hasError('required')">Password is required</mat-error>
          </mat-form-field>

          <div *ngIf="error" class="text-red-600 text-sm">{{ error }}</div>

          <div *ngIf="showResendLink" class="text-sm text-center">
            <a (click)="resendVerification()" class="text-indigo-600 font-medium hover:underline cursor-pointer">
              Resend verification email
            </a>
            <div *ngIf="resendMessage" class="text-green-600 mt-1">{{ resendMessage }}</div>
          </div>

          <button mat-flat-button color="primary" type="submit" [disabled]="loading" class="w-full py-2">
            <mat-spinner *ngIf="loading" diameter="20" class="inline-block mr-2"></mat-spinner>
            {{ loading ? 'Signing in...' : 'Sign In' }}
          </button>
        </form>

        <p class="text-center mt-6 text-sm text-gray-500">
          Don't have an account?
          <a routerLink="/register" class="text-indigo-600 font-medium hover:underline">Register</a>
        </p>
      </mat-card>
    </div>
  `,
})
export class LoginComponent implements OnInit {
  loginForm = this.fb.group({
    email: ['', [Validators.required, Validators.email]],
    password: ['', Validators.required],
  });
  loading = false;
  error = '';
  showResendLink = false;
  resendMessage = '';
  showVerifiedMessage = false;
  private unverifiedEmail = '';

  constructor(
    private fb: FormBuilder,
    private authService: AuthService,
    private router: Router,
    private route: ActivatedRoute,
  ) {}

  ngOnInit(): void {
    if (this.route.snapshot.queryParams['verified'] === 'true') {
      this.showVerifiedMessage = true;
    }
  }

  onSubmit(): void {
    if (this.loginForm.invalid) return;
    this.loading = true;
    this.error = '';
    this.showResendLink = false;
    this.resendMessage = '';
    const { email, password } = this.loginForm.value;
    this.authService.login(email!, password!).subscribe({
      next: () => this.router.navigate(['/dashboard']),
      error: (err) => {
        const msg = err.error?.detail || err.error?.message || 'Invalid email or password';
        if (msg.toLowerCase().includes('verify your email')) {
          this.error = 'Please verify your email address before logging in.';
          this.showResendLink = true;
          this.unverifiedEmail = email!;
        } else {
          this.error = msg;
        }
        this.loading = false;
      },
    });
  }

  resendVerification(): void {
    if (!this.unverifiedEmail) return;
    this.authService.resendVerification(this.unverifiedEmail).subscribe({
      next: () => {
        this.resendMessage = 'Verification email resent.';
      },
      error: () => {
        this.resendMessage = 'Failed to resend. Please try again later.';
      },
    });
  }
}