import { format, isPast, parseISO } from 'date-fns';
import { ChevronRight, GripVertical } from 'lucide-react';
import type { ProjectTask } from '@/types';
import { Checkbox } from '@/components/ui/checkbox';
import { Badge } from '@/components/ui/badge';
import { AssigneeAvatars } from './AssignmentPicker';

const taskStatusColors: Record<string, string> = {
  pending: 'bg-gray-500/10 text-gray-400 border-gray-500/20',
  in_progress: 'bg-blue-500/10 text-blue-400 border-blue-500/20',
  completed: 'bg-green-500/10 text-green-400 border-green-500/20',
  blocked: 'bg-red-500/10 text-red-400 border-red-500/20',
  review: 'bg-yellow-500/10 text-yellow-400 border-yellow-500/20',
  on_hold: 'bg-orange-500/10 text-orange-400 border-orange-500/20',
};

const priorityColors: Record<string, string> = {
  none: 'bg-gray-500/20 text-gray-400',
  low: 'bg-green-500/20 text-green-400',
  medium: 'bg-yellow-500/20 text-yellow-400',
  high: 'bg-red-500/20 text-red-400',
};

interface TaskRowProps {
  task: ProjectTask;
  isSelected: boolean;
  isExpanded: boolean;
  showDragHandle: boolean;
  onSelect: () => void;
  onToggleExpand: () => void;
  onToggleStatus: () => void;
  togglePending: boolean;
  dragHandleProps?: Record<string, unknown>;
}

export default function TaskRow({
  task,
  isSelected,
  isExpanded,
  showDragHandle,
  onSelect,
  onToggleExpand,
  onToggleStatus,
  togglePending,
  dragHandleProps,
}: TaskRowProps) {
  const hasSubtasks = task.subtasks && task.subtasks.length > 0;
  const completedSubtasks = hasSubtasks
    ? task.subtasks.filter((s) => s.status === 'completed').length
    : 0;
  const isOverdue =
    task.due_date && task.status !== 'completed' && isPast(parseISO(task.due_date));

  return (
    <div
      className={`relative flex items-center gap-1.5 sm:gap-2 px-2 sm:px-3 py-2 rounded-lg cursor-pointer transition-colors duration-150 ${
        isSelected
          ? 'bg-accent/5 border-l-2 border-accent'
          : 'border-l-2 border-transparent hover:bg-card-elevated'
      }`}
      onClick={onSelect}
    >
      {/* Drag handle */}
      {showDragHandle && (
        <div
          {...dragHandleProps}
          className="cursor-grab active:cursor-grabbing text-muted-foreground hover:text-foreground shrink-0"
          onClick={(e) => e.stopPropagation()}
        >
          <GripVertical className="h-4 w-4" />
        </div>
      )}

      {/* Expand chevron */}
      <button
        onClick={(e) => {
          e.stopPropagation();
          if (hasSubtasks) onToggleExpand();
        }}
        className={`shrink-0 transition-colors ${
          hasSubtasks
            ? 'text-muted-foreground hover:text-foreground cursor-pointer'
            : 'text-transparent cursor-default'
        }`}
      >
        <ChevronRight
          className={`h-3.5 w-3.5 transition-transform duration-200 ${
            isExpanded ? 'rotate-90' : ''
          }`}
        />
      </button>

      {/* Checkbox */}
      <div onClick={(e) => e.stopPropagation()} className="shrink-0">
        <Checkbox
          checked={task.status === 'completed'}
          onChange={onToggleStatus}
          disabled={togglePending}
        />
      </div>

      {/* Title */}
      <span
        className={`flex-1 text-sm font-medium truncate ${
          task.status === 'completed' ? 'line-through text-muted-foreground' : ''
        }`}
      >
        {task.title}
      </span>

      {/* Metadata columns */}
      <Badge className={`text-[9px] px-1.5 py-0.5 shrink-0 w-16 text-center hidden sm:inline-flex ${taskStatusColors[task.status]}`}>
        {task.status.replace('_', ' ')}
      </Badge>

      <Badge
        className={`text-[9px] px-1.5 py-0.5 rounded-full shrink-0 w-14 text-center hidden sm:inline-flex ${priorityColors[task.priority]}`}
      >
        {task.priority}
      </Badge>

      <span
        className={`text-[11px] shrink-0 tabular-nums w-12 text-right hidden sm:block ${
          task.due_date
            ? isOverdue ? 'text-red-400' : 'text-muted-foreground'
            : 'text-transparent'
        }`}
      >
        {task.due_date ? format(parseISO(task.due_date), 'MMM d') : '—'}
      </span>

      <span className={`text-[11px] shrink-0 tabular-nums w-8 text-right hidden sm:block ${
        hasSubtasks ? 'text-muted-foreground' : 'text-transparent'
      }`}>
        {hasSubtasks ? `${completedSubtasks}/${task.subtasks.length}` : '—'}
      </span>

      {/* Assignee avatars */}
      {task.assignments && task.assignments.length > 0 && (
        <span className="hidden sm:flex shrink-0">
          <AssigneeAvatars assignments={task.assignments} max={3} />
        </span>
      )}

      {/* Mobile-only: compact priority dot + overdue indicator */}
      <div className="flex items-center gap-1.5 sm:hidden shrink-0">
        <div className={`h-2 w-2 rounded-full ${
          task.priority === 'high' ? 'bg-red-400' :
          task.priority === 'medium' ? 'bg-yellow-400' :
          task.priority === 'low' ? 'bg-green-400' : 'bg-gray-500'
        }`} />
        {isOverdue && <span className="text-[10px] text-red-400 tabular-nums">{task.due_date ? format(parseISO(task.due_date), 'M/d') : ''}</span>}
      </div>

      {/* Subtask progress bar */}
      {hasSubtasks && (
        <div className="absolute bottom-0 left-0 right-0 h-[2px] bg-secondary/50 rounded-full overflow-hidden">
          <div
            className="h-full bg-accent rounded-full transition-all duration-300"
            style={{ width: `${(completedSubtasks / task.subtasks.length) * 100}%` }}
          />
        </div>
      )}
    </div>
  );
}