import { useState, useEffect } from 'react'
import { useNavigate } from 'react-router-dom'
import { ClipboardList, ArrowRight, Clock } from 'lucide-react'
import { sessionsApi } from '@/api/sessions'
import type { Session } from '@/types/session'
import { getTreeNavigatePath } from '@/lib/routing'
import { cn } from '@/lib/utils'

export function PreparedSessions() {
  const navigate = useNavigate()
  const [sessions, setSessions] = useState<Session[]>([])
  const [isLoading, setIsLoading] = useState(true)

  useEffect(() => {
    sessionsApi.list({ status: 'prepared', size: 10 })
      .then(setSessions)
      .catch(() => setSessions([]))
      .finally(() => setIsLoading(false))
  }, [])

  if (isLoading || sessions.length === 0) return null

  const handleStart = (session: Session) => {
    const treeType = (session.tree_snapshot as unknown as Record<string, unknown>)?.tree_type as string | undefined
    navigate(getTreeNavigatePath(session.tree_id, treeType), {
      state: { sessionId: session.id },
    })
  }

  return (
    <div className="card-flat p-5 fade-in" style={{ animationDelay: '200ms' }}>
      <div className="flex items-center justify-between mb-3">
        <div className="flex items-center gap-2">
          <ClipboardList className="h-4 w-4 text-blue-400" />
          <h3 className="font-heading text-sm font-semibold text-foreground">Prepared for You</h3>
          <span className="flex h-5 w-5 items-center justify-center rounded-full bg-blue-400/20 text-[0.625rem] font-bold text-blue-400">
            {sessions.length}
          </span>
        </div>
      </div>

      <div className="space-y-2">
        {sessions.map(session => {
          const snapshot = session.tree_snapshot as unknown as Record<string, unknown>
          const flowName = (snapshot?.name as string) || 'Unknown Flow'
          const filledVars = Object.values(session.session_variables || {}).filter(v => v?.trim()).length
          const treeType = snapshot?.tree_type as string | undefined

          return (
            <button
              key={session.id}
              onClick={() => handleStart(session)}
              className={cn(
                'group flex w-full items-center justify-between gap-3 rounded-lg border border-border px-4 py-3',
                'text-left transition-all hover:border-blue-500/30 hover:bg-blue-500/5'
              )}
            >
              <div className="min-w-0 flex-1">
                <p className="text-sm font-medium text-foreground truncate">{flowName}</p>
                <div className="mt-1 flex items-center gap-3 text-xs text-muted-foreground">
                  {session.ticket_number && (
                    <span>{session.ticket_number}</span>
                  )}
                  {session.client_name && (
                    <span>{session.client_name}</span>
                  )}
                  {filledVars > 0 && (
                    <span>{filledVars} variable{filledVars > 1 ? 's' : ''} pre-filled</span>
                  )}
                  <span className="flex items-center gap-1">
                    <Clock className="h-3 w-3" />
                    {treeType === 'procedural' ? 'Project' : treeType === 'maintenance' ? 'Maintenance' : 'Flow'}
                  </span>
                </div>
              </div>
              <ArrowRight className="h-4 w-4 shrink-0 text-muted-foreground opacity-0 transition-opacity group-hover:opacity-100" />
            </button>
          )
        })}
      </div>
    </div>
  )
}
