import { Component, inject, signal } from '@angular/core';
import { RouterLink, ActivatedRoute } from '@angular/router';
import { FormsModule } from '@angular/forms';
import { MailService } from '../../services/mail.service';
import { Message, Folder } from '../../models/mail.models';
import { DatePipe, SlicePipe } from '@angular/common';
import { map, switchMap } from 'rxjs/operators';
import { of } from 'rxjs';

@Component({
  selector: 'app-inbox',
  standalone: true,
  imports: [RouterLink, FormsModule, DatePipe, SlicePipe],
  providers: [MailService],
  template: `
    <div class="space-y-4">
      <!-- Поиск -->
      <div class="glass-panel p-4">
        <div class="flex gap-3">
          <input [(ngModel)]="searchQuery" (keyup.enter)="loadMessages()"
            class="flex-1 bg-slate-950/80 border border-cyan-500/40 rounded-xl px-4 py-2 text-sm text-slate-200 font-mono focus:outline-none focus:ring-2 focus:ring-pink-500 focus:border-cyan-400 transition-all"
            placeholder="Search messages...">
          <button (click)="loadMessages()" class="cyber-btn px-6 py-2 rounded-xl text-xs font-bold">
            <i class="fa-solid fa-magnifying-glass mr-1"></i> SEARCH
          </button>
        </div>
      </div>

      <!-- Список писем -->
      <div class="glass-panel p-4">
        <h2 class="text-lg font-orbitron font-bold text-cyan-300 mb-4 flex items-center gap-2">
          <i class="fa-solid fa-inbox text-pink-500"></i> {{ folderName() }}
          <span class="text-sm font-mono text-slate-400 ml-auto">{{ messages()?.length || 0 }} messages</span>
        </h2>

        @if (!messages() || messages().length === 0) {
          <div class="text-center py-12 text-slate-400 font-mono">
            <i class="fa-solid fa-envelope-open-text text-4xl mb-4 text-slate-600"></i>
            <p>No messages yet</p>
          </div>
        } @else {
          <div class="space-y-2">
            @for (msg of messages() || []; track msg.id) {
              <a routerLink="/message/{{ msg.id }}"
                 class="block p-4 rounded-xl border border-cyan-500/10 hover:border-cyan-500/40 hover:bg-cyan-500/5 transition-all cursor-pointer group">
                <div class="flex items-start gap-3">
                  <!-- Индикатор прочитанности -->
                  <div class="mt-1">
                    @if (!msg.read) {
                      <span class="w-3 h-3 rounded-full bg-pink-500 inline-block shadow-[0_0_8px_rgba(255,0,127,0.8)]"></span>
                    } @else {
                      <span class="w-3 h-3 rounded-full border border-slate-500 inline-block"></span>
                    }
                  </div>

                  <div class="flex-1 min-w-0">
                    <div class="flex items-center gap-2 mb-1">
                      <span class="font-bold text-sm text-slate-200 font-rajdhani truncate">
                        {{ msg.senderName || msg.sender }}
                      </span>
                      @if (msg.spam) {
                        <span class="px-2 py-0.5 text-xs rounded-full bg-yellow-500/20 text-yellow-400 font-mono">
                          SPAM
                        </span>
                      }
                      @if (msg.flagged) {
                        <i class="fa-solid fa-star text-yellow-400 text-xs"></i>
                      }
                    </div>
                    <div class="text-sm text-cyan-400 font-rajdhani truncate group-hover:text-pink-400 transition-colors">
                      {{ msg.subject || '(No subject)' }}
                    </div>
                    <div class="text-xs text-slate-400 font-mono truncate">
                      {{ msg.body || '' | slice:0:100 }}{{ (msg.body || '').length > 100 ? '...' : '' }}
                    </div>
                  </div>

                  <div class="text-right flex-shrink-0">
                    <div class="text-xs text-slate-400 font-mono">
                      {{ msg.sentAt | date:'MMM d, HH:mm' }}
                    </div>
                    @if (msg.hasAttachments) {
                      <span class="text-xs text-purple-400 font-mono"><i class="fa-solid fa-paperclip mr-1"></i>{{ msg.attachmentCount }}</span>
                    }
                  </div>
                </div>
              </a>
            }
          </div>
        }
      </div>

      <!-- Пагинация -->
      @if (totalPages() > 1) {
        <div class="glass-panel p-4 flex items-center justify-center gap-2">
          <button (click)="goToPage(page() - 1)" [disabled]="page() === 0"
            class="px-3 py-1 rounded-lg text-xs font-mono text-cyan-400 border border-cyan-500/30 hover:bg-cyan-500/10 disabled:opacity-30 disabled:cursor-not-allowed transition-all">
            <i class="fa-solid fa-chevron-left mr-1"></i> Prev
          </button>
          @for (p of pageNumbers; track p) {
            <button (click)="goToPage(p)"
              [class.bg-pink-500/20]="p === page()" [class.text-pink-400]="p === page()"
              [class.border-pink-500]="p === page()"
              class="px-3 py-1 rounded-lg text-xs font-mono text-slate-400 border border-cyan-500/20 hover:bg-cyan-500/10 hover:text-cyan-300 transition-all">
              {{ p + 1 }}
            </button>
          }
          <button (click)="goToPage(page() + 1)" [disabled]="page() >= totalPages() - 1"
            class="px-3 py-1 rounded-lg text-xs font-mono text-cyan-400 border border-cyan-500/30 hover:bg-cyan-500/10 disabled:opacity-30 disabled:cursor-not-allowed transition-all">
            Next <i class="fa-solid fa-chevron-right ml-1"></i>
          </button>
          <span class="text-xs font-mono text-slate-500 ml-2">
            Page {{ page() + 1 }} of {{ totalPages() }}
          </span>
        </div>
      }
    </div>
  `,
  styles: ``
})
export default class InboxComponent {
  private route = inject(ActivatedRoute);
  private mailService = inject(MailService);
  messages = signal<Message[]>([]);
  folderName = signal<string>('INBOX');
  searchQuery = '';
  folderId = signal<number>(1);
  page = signal<number>(0);
  totalPages = signal<number>(1);
  pageSize = 20;

  constructor() {
    // Подписываемся на изменения folderId в queryParams
    this.route.queryParams.subscribe(params => {
      const newFolderId = params['folderId'] ? Number(params['folderId']) : 1;
      if (newFolderId !== this.folderId()) {
        this.folderId.set(newFolderId);
        this.loadFolderName(newFolderId);
        this.loadMessages();
      }
    });
    // Начальная загрузка
    const initialFolderId = this.route.snapshot.queryParams['folderId'] ? Number(this.route.snapshot.queryParams['folderId']) : 1;
    this.folderId.set(initialFolderId);
    this.loadFolderName(initialFolderId);
    this.loadMessages();
  }

  loadFolderName(folderId: number): void {
    this.mailService.getFolders().subscribe({
      next: (folders) => {
        const folder = folders.find(f => f.id === folderId);
        this.folderName.set(folder ? folder.name : 'INBOX');
      },
      error: () => this.folderName.set('INBOX')
    });
  }

  loadMessages(): void {
    const currentFolderId = this.folderId();
    const currentPage = this.page();
    if (this.searchQuery.trim()) {
      this.mailService.searchMessages(currentFolderId, this.searchQuery.trim()).subscribe({
        next: (msgs) => this.messages.set(msgs),
        error: () => console.error('Search failed')
      });
    } else {
      this.mailService.getMessages(currentFolderId, currentPage, this.pageSize).subscribe({
        next: (result) => {
          this.messages.set(result.content);
          this.totalPages.set(result.totalPages);
        },
        error: () => console.error('Failed to load messages')
      });
    }
  }

  goToPage(page: number): void {
    if (page >= 0 && page < this.totalPages()) {
      this.page.set(page);
      this.loadMessages();
    }
  }

  get pageNumbers(): number[] {
    const pages: number[] = [];
    const total = this.totalPages();
    const current = this.page();
    const start = Math.max(0, current - 2);
    const end = Math.min(total - 1, current + 2);
    for (let i = start; i <= end; i++) {
      pages.push(i);
    }
    return pages;
  }
}