import { useState } from 'react'
import { FaChevronDown, FaPlay, FaStop, FaPlus, FaClockRotateLeft, FaPen } from 'react-icons/fa6'
import { formatDistanceToNow, format } from 'date-fns'
import { de } from 'date-fns/locale'
import StatusDropdown from './StatusDropdown'
import PriorityDropdown from './PriorityDropdown'
import EditorDropdown from './EditorDropdown'
import ResponseDropdown from './ResponseDropdown'
import CreateWorksheetModal from './CreateWorksheetModal'
import StatusHistoryModal from './StatusHistoryModal'
import WorksheetList from './WorksheetList'
import WorksheetStats from './WorksheetStats'
import TicketAssignedProjectsPanel from './TicketAssignedProjectsPanel'
import TicketProjectsModal from './TicketProjectsModal'
import InvoicePanel from './InvoicePanel'
import DocumentsPanel from './DocumentsPanel'
import Tabs from './ui/Tabs'
import Badge from './ui/Badge'
import { StatusPill, PriorityPill } from './ui/StatusPill'
import { useWorksheets } from '../hooks/useWorksheets'

const TABS = [
  { id: 'details', label: 'Details' },
  { id: 'worksheets', label: 'Arbeitsblaetter' },
  { id: 'invoices', label: 'Rechnungen' },
  { id: 'documents', label: 'Dokumente' },
  { id: 'project', label: 'Projekt / Preview' },
]

export default function TicketCard({ ticket, onUpdate }) {
  const [expanded, setExpanded] = useState(false)
  const [activeTab, setActiveTab] = useState('details')
  const [showCreateWorksheet, setShowCreateWorksheet] = useState(false)
  const [showHistoryModal, setShowHistoryModal] = useState(false)
  const [showProjectsModal, setShowProjectsModal] = useState(false)
  const [projectsRefreshKey, setProjectsRefreshKey] = useState(0)

  const { worksheets, loading: worksheetsLoading, createWorksheet, getTotalTime } = useWorksheets(
    expanded ? ticket.woid : null
  )

  const createdAt = new Date(ticket.$createdAt || ticket.createdAt)
  const elapsed = formatDistanceToNow(createdAt, { locale: de, addSuffix: true })

  const stop = (e) => e.stopPropagation()

  const handleCreateWorksheet = async (worksheetData, currentUser) => {
    const result = await createWorksheet(worksheetData, currentUser)
    if (result.success && worksheetData.newStatus !== ticket.status) {
      await onUpdate(ticket.$id, {
        status: worksheetData.newStatus,
        responseLevel: worksheetData.newResponseLevel || ticket.responseLevel,
      })
    }
    return result
  }

  return (
    <div className={`tcard ${expanded ? 'open' : ''}`}>
      <div className="tcard-main" onClick={() => setExpanded((e) => !e)}>
        <div className="tcard-woid">
          <span className="id">{ticket.woid || ticket.$id?.slice(-5)}</span>
          <span className="age">{elapsed}</span>
        </div>

        <div className="tcard-body">
          <div className="tcard-row1">
            <span className="tcard-customer">{ticket.customerName || 'Unbekannt'}</span>
            {ticket.customerLocation && <span className="tcard-loc">· {ticket.customerLocation}</span>}
          </div>
          <div className="tcard-topic">{ticket.topic || ticket.title || 'Kein Betreff'}</div>
          <div className="tcard-badges">
            <StatusPill status={ticket.status} />
            <PriorityPill priority={ticket.priority} />
            {ticket.type && <Badge tone="muted">{ticket.type}</Badge>}
            {ticket.systemType && ticket.systemType !== 'n/a' && <Badge tone="muted">{ticket.systemType}</Badge>}
            {ticket.serviceType && <Badge tone="info">{ticket.serviceType}</Badge>}
          </div>
        </div>

        <div className="tcard-side" onClick={stop}>
          <div style={{ minWidth: 120 }}>
            <StatusDropdown value={ticket.status} onChange={(v) => onUpdate(ticket.$id, { status: v })} />
          </div>
          <div style={{ minWidth: 110 }}>
            <PriorityDropdown value={ticket.priority} onChange={(v) => onUpdate(ticket.$id, { priority: v })} />
          </div>
          <FaChevronDown className={`chevron ${expanded ? 'up' : ''}`} onClick={() => setExpanded((e) => !e)} style={{ cursor: 'pointer' }} />
        </div>
      </div>

      {expanded && (
        <div className="tcard-detail">
          <div className="flex gap-3 wrap" style={{ marginBottom: 16, fontSize: 13 }}>
            <span className="muted"><FaPlay style={{ color: 'var(--ok)' }} /> {ticket.startDate || format(createdAt, 'dd.MM.yyyy')}</span>
            <span className="muted"><FaStop style={{ color: 'var(--danger)' }} /> {ticket.deadline || '-'}</span>
            {ticket.requestedBy && <span className="muted">Angefragt von: {ticket.requestedBy}</span>}
            <span className="grow" />
            <div style={{ minWidth: 150 }}><EditorDropdown value={ticket.assignedTo} onChange={(v) => onUpdate(ticket.$id, { assignedTo: v })} /></div>
            <div style={{ minWidth: 150 }}><ResponseDropdown value={ticket.responseLevel} onChange={(v) => onUpdate(ticket.$id, { responseLevel: v })} /></div>
          </div>

          <Tabs tabs={TABS} active={activeTab} onChange={setActiveTab} />

          <div className="ticket-tab-content">
            {activeTab === 'details' && (
              <div className="ui-card pad">
                <h5 style={{ fontWeight: 700, marginBottom: 12 }}>Ticket-Beschreibung</h5>
                <p style={{ whiteSpace: 'pre-wrap', color: 'var(--text-muted)', lineHeight: 1.7, margin: 0 }}>
                  {ticket.details || 'Keine Details vorhanden.'}
                </p>
              </div>
            )}

            {activeTab === 'worksheets' && (
              <div>
                <div className="flex gap-2" style={{ marginBottom: 16 }}>
                  <button className="ui-btn ui-btn-primary grow" onClick={() => setShowCreateWorksheet(true)}>
                    <FaPlus /> Arbeitsblatt hinzufuegen
                  </button>
                  <button className="ui-btn" onClick={() => setShowProjectsModal(true)} title="Projekte"><FaPen /></button>
                  <button className="ui-btn" onClick={() => setShowHistoryModal(true)} title="Verlauf"><FaClockRotateLeft /></button>
                </div>
                {worksheets.length > 0 && (
                  <div className="ui-card pad" style={{ marginBottom: 16 }}>
                    <WorksheetStats worksheets={worksheets} />
                  </div>
                )}
                <WorksheetList worksheets={worksheets} totalTime={getTotalTime()} loading={worksheetsLoading} />
              </div>
            )}

            {activeTab === 'invoices' && <InvoicePanel ticket={ticket} />}
            {activeTab === 'documents' && <DocumentsPanel ticket={ticket} />}
            {activeTab === 'project' && (
              <div>
                <button className="ui-btn ui-btn-primary" style={{ marginBottom: 12 }} onClick={() => setShowProjectsModal(true)}>
                  <FaPen /> Projekte zuweisen / bearbeiten
                </button>
                <TicketAssignedProjectsPanel ticket={ticket} refreshKey={projectsRefreshKey} />
              </div>
            )}
          </div>
        </div>
      )}

      <CreateWorksheetModal isOpen={showCreateWorksheet} onClose={() => setShowCreateWorksheet(false)} workorder={ticket} onCreate={handleCreateWorksheet} />
      <StatusHistoryModal isOpen={showHistoryModal} onClose={() => setShowHistoryModal(false)} worksheets={worksheets} ticket={ticket} />
      <TicketProjectsModal isOpen={showProjectsModal} onClose={() => setShowProjectsModal(false)} ticket={ticket} onUpdated={() => setProjectsRefreshKey((k) => k + 1)} />
    </div>
  )
}