import { CommonModule } from '@angular/common';
import {
  ChangeDetectionStrategy,
  Component,
  effect,
  input,
  output,
  signal,
} from '@angular/core';
import { MatBadgeModule } from '@angular/material/badge';
import { MatButtonModule } from '@angular/material/button';
import { MatDividerModule } from '@angular/material/divider';
import { MatExpansionModule } from '@angular/material/expansion';
import { MatIconModule } from '@angular/material/icon';
import { CommentResponse, TaskResponse, User } from '@org/shared/api';
import { TaskCommentComponent } from './task-comment.component';

@Component({
  selector: 'lib-task-card',
  imports: [
    CommonModule,
    MatExpansionModule,
    MatIconModule,
    MatDividerModule,
    MatBadgeModule,
    MatButtonModule,
    TaskCommentComponent,
  ],
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <mat-expansion-panel class="task-panel">
      <mat-expansion-panel-header>
        <mat-panel-title>
          <div class="task-title-container">
            <mat-icon>assignment</mat-icon>
            <span>{{ task().tasks.title }}</span>
          </div>
        </mat-panel-title>
        <mat-panel-description>
          <div class="task-info">
            <div class="task-info-row">
              <span class="task-author"
                >By {{ getUserName(task().tasks.userId) }}</span
              >
              @if (taskComments().length) {
              <mat-icon
                class="comment-badge"
                matBadge="{{ taskComments().length }}"
                matBadgeColor="accent"
              >
                comment
              </mat-icon>
              }
            </div>
            <span class="task-timestamp">{{
              formatDate(task().tasks.timestamp)
            }}</span>
          </div>
        </mat-panel-description>
      </mat-expansion-panel-header>

      <div class="task-details">
        <p class="task-description">
          {{ task().tasks.description }}
        </p>

        <mat-divider></mat-divider>

        <div class="comments-section">
          <h3>
            <mat-icon>forum</mat-icon>
            Comments
          </h3>

          <lib-task-comment
            [taskId]="task().tasks.id"
            [comments]="taskComments()"
            [users]="users()"
            [submitting]="addingComment()"
            (addComment)="handleAddComment($event)"
          ></lib-task-comment>
        </div>
      </div>
    </mat-expansion-panel>
  `,
  styles: [
    `
      .task-panel {
        margin-bottom: 1rem;
        border-radius: var(--mat-sys-corner-small);
        box-shadow: var(--mat-sys-level1);
        transition: all 0.3s ease;
      }

      .task-panel:hover {
        box-shadow: var(--mat-sys-level3);
      }

      .task-panel .mat-expansion-panel-header {
        height: auto;
        min-height: 64px;
        padding: 0.75rem 1rem;
      }

      .task-title-container {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        flex: 1;
        min-width: 0;
        margin-right: 1rem;
      }

      .task-title-container mat-icon {
        color: #1976d2;
      }

      .task-title-container span {
        font-weight: 500;
        font-size: 1.1rem;
        overflow-wrap: break-word;
        word-wrap: break-word;
        word-break: break-word;
      }

      .task-info {
        display: flex;
        flex-direction: column;
        align-items: flex-end;
        gap: 0.25rem;
        min-width: 150px;
        text-align: right;
      }

      .task-info-row {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        justify-content: flex-end;
        margin-top: 0.5rem;
      }

      .task-author {
        font-weight: 500;
        color: #424242;
      }

      .task-timestamp {
        font-size: 0.8rem;
        color: var(--mat-sys-on-surface-variant);
      }

      .task-details {
        padding: 1rem 0;
      }

      .task-description {
        font-size: var(--mat-sys-body-large-size);
        line-height: 1.6;
        margin-bottom: 1.5rem;
        white-space: pre-line;
        color: var(--mat-sys-on-surface);
        background-color: var(--mat-sys-surface-container-low);
        padding: 1rem;
        border-radius: var(--mat-sys-corner-small);
        border-left: 4px solid var(--mat-sys-primary);
      }

      .comments-section {
        margin-top: 1.5rem;
      }

      .comments-section h3 {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        font-size: var(--mat-sys-title-medium-size);
        margin-bottom: 1rem;
        color: var(--mat-sys-on-surface);
      }

      .comments-section h3 mat-icon {
        color: #1976d2;
      }

      @media (max-width: 768px) {
        .task-info {
          align-items: flex-start;
        }
      }
    `,
  ],
})
export class TaskCardComponent {
  readonly task = input.required<TaskResponse>();
  readonly users = input<User[]>([]);
  readonly comments = input<CommentResponse[]>([]);
  readonly addingComment = input<boolean>(false);
  readonly commentAdded = output<{
    taskId: number;
    content: string;
    userId: number;
  }>();

  readonly taskComments = signal<CommentResponse[]>([]);

  constructor() {
    // Update task comments whenever comments or task changes
    effect(() => {
      const taskId = this.task()?.tasks?.id;
      if (taskId && this.comments()) {
        this.taskComments.set(
          this.comments().filter(
            (comment) => comment.comments.taskId === taskId
          )
        );
      }
    });
  }

  getUserName(userId: number): string {
    const user = this.users().find((u) => u.id === userId);
    return user ? user.name : 'Unknown User';
  }

  formatDate(timestamp?: string): string {
    if (!timestamp) return 'Unknown date';

    const date = new Date(timestamp);
    const now = new Date();
    const diffMs = now.getTime() - date.getTime();
    const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));

    if (diffDays === 0) {
      return (
        'Today at ' +
        date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
      );
    } else if (diffDays === 1) {
      return (
        'Yesterday at ' +
        date.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
      );
    } else if (diffDays < 7) {
      return `${diffDays} days ago`;
    } else {
      return date.toLocaleDateString([], {
        day: 'numeric',
        month: 'short',
        year: 'numeric',
      });
    }
  }

  handleAddComment(commentData: { content: string; userId: number }) {
    this.commentAdded.emit({
      taskId: this.task().tasks.id,
      ...commentData,
    });
  }
}