import { useId } from 'react'
import { MapPin, Ticket, Check, Paperclip } from 'lucide-react'
import type { Place, Reservation, Day, TripFile } from '../../types'
import type { FileManagerState } from './useFileManager'
import { TRANSPORT_TYPES } from './FileManager.constants'
import { transportIcon } from './FileManager.helpers'
import { planFileLinkToggle, runFileLinkRecordStep, type FileLinkField } from './fileActions'
import { DialogHeader, DialogShell, DialogTile, NEUTRAL_TINT } from '../shared/DialogShell'
import { EditorField, INPUT } from '../shared/dialogParts'

export function AssignModal(S: FileManagerState) {
  const { files, assignFileId, setAssignFileId, t, days, assignments, places, reservations, tripId, handleAssign, refreshFiles } = S
  const labelId = useId()
  const close = () => setAssignFileId(null)
  // The file's own column goes through handleAssign, which toasts a failure.
  const toggleLink = async (file: TripFile, field: FileLinkField, targetId: number) => {
    const step = planFileLinkToggle(file, field, targetId)
    if (step.kind === 'update') {
      await handleAssign(file.id, step.data)
      return
    }
    try {
      await runFileLinkRecordStep(tripId, file.id, field, targetId, step.kind)
      refreshFiles()
    } catch {
      // A failed link record change stays quiet.
    }
  }
  return (
    <DialogShell
      onClose={close}
      labelledBy={labelId}
      header={(
        <DialogHeader
          tile={<DialogTile><Paperclip size={20} strokeWidth={1.9} className="text-content-muted" /></DialogTile>}
          tint={NEUTRAL_TINT}
          labelId={labelId}
          onClose={close}
          eyebrow={t('files.assignTitle')}
          title={files.find(f => f.id === assignFileId)?.original_name || ''}
        />
      )}
    >
        <EditorField label={t('files.noteLabel') || 'Note'}>
          <input
            type="text"
            placeholder={t('files.notePlaceholder')}
            defaultValue={files.find(f => f.id === assignFileId)?.description || ''}
            onBlur={e => {
              const val = e.target.value.trim()
              const file = files.find(f => f.id === assignFileId)
              if (file && val !== (file.description || '')) {
                void handleAssign(file.id, { description: val } as any)
              }
            }}
            onKeyDown={e => { if (e.key === 'Enter') (e.target as HTMLInputElement).blur() }}
            className={INPUT}
          />
        </EditorField>
        <div className="rounded-[16px] bg-surface-secondary p-2">
          {(() => {
            const file = files.find(f => f.id === assignFileId)
            if (!file) return null
            const assignedPlaceIds = new Set<number>()
            const dayGroups: { day: Day; dayPlaces: Place[] }[] = []
            for (const day of days) {
              const da = assignments[String(day.id)] || []
              const dayPlaces = da.map(a => places.find(p => p.id === a.place?.id || p.id === a.place_id)).filter(Boolean) as Place[]
              if (dayPlaces.length > 0) {
                dayGroups.push({ day, dayPlaces })
                dayPlaces.forEach(p => assignedPlaceIds.add(p.id))
              }
            }
            const unassigned = places.filter(p => !assignedPlaceIds.has(p.id))
            const placeBtn = (p: Place, idx: number) => {
              const isLinked = file.place_id === p.id || (file.linked_place_ids || []).includes(p.id)
              return (
                <button type="button" key={`${p.id}-${idx}`} onClick={() => toggleLink(file, 'place_id', p.id)} style={{
                  width: '100%', textAlign: 'start', paddingBlock: 6, paddingInlineEnd: 10, paddingInlineStart: 20, background: isLinked ? 'var(--bg-hover)' : 'none',
                  border: 'none', cursor: 'pointer', fontSize: 'calc(13px * var(--fs-scale-body, 1))', color: 'var(--text-primary)',
                  borderRadius: 8, fontFamily: 'inherit', fontWeight: isLinked ? 600 : 400,
                  display: 'flex', alignItems: 'center', gap: 6,
                }}
                  onMouseEnter={e => e.currentTarget.style.background = 'var(--bg-hover)'}
                  onMouseLeave={e => e.currentTarget.style.background = isLinked ? 'var(--bg-hover)' : 'transparent'}>
                  <MapPin size={12} style={{ flexShrink: 0, color: 'var(--text-muted)' }} />
                  <span style={{ overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{p.name}</span>
                  {isLinked && <Check size={14} style={{ marginInlineStart: 'auto', flexShrink: 0, color: 'var(--accent)' }} />}
                </button>
              )
            }

            const placesSection = places.length > 0 && (
              <div style={{ flex: 1, minWidth: 0 }}>
                <div style={{ fontSize: 'calc(11px * var(--fs-scale-caption, 1))', fontWeight: 600, color: 'var(--text-faint)', padding: '8px 10px 4px', textTransform: 'uppercase', letterSpacing: 0.5 }}>
                  {t('files.assignPlace')}
                </div>
                {dayGroups.map(({ day, dayPlaces }) => (
                  <div key={day.id}>
                    <div style={{ display: 'flex', alignItems: 'center', gap: 6, fontSize: 'calc(11px * var(--fs-scale-caption, 1))', fontWeight: 600, color: 'var(--text-muted)', padding: '8px 10px 2px' }}>
                      <span>{day.title || t('dayplan.dayN', { n: day.day_number })}</span>
                      {(() => {
                        const badge = day.date || (day.title ? t('dayplan.dayN', { n: day.day_number }) : null)
                        return badge ? (
                          <span style={{
                            fontSize: 'calc(10px * var(--fs-scale-caption, 1))', fontWeight: 600, color: 'var(--text-faint)',
                            background: 'var(--bg-tertiary)', padding: '1px 6px', borderRadius: 999,
                          }}>{badge}</span>
                        ) : null
                      })()}
                    </div>
                    {dayPlaces.map((p, i) => placeBtn(p, i))}
                  </div>
                ))}
                {unassigned.length > 0 && (
                  <div>
                    {dayGroups.length > 0 && <div style={{ fontSize: 'calc(11px * var(--fs-scale-caption, 1))', fontWeight: 600, color: 'var(--text-muted)', padding: '8px 10px 2px' }}>{t('files.unassigned')}</div>}
                    {unassigned.map((p, i) => placeBtn(p, i))}
                  </div>
                )}
              </div>
            )

            const bookingReservations = reservations.filter(r => !TRANSPORT_TYPES.has(r.type))
            const transportReservations = reservations.filter(r => TRANSPORT_TYPES.has(r.type))

            const reservationBtn = (r: Reservation) => {
              const isLinked = file.reservation_id === r.id || (file.linked_reservation_ids || []).includes(r.id)
              const Icon = TRANSPORT_TYPES.has(r.type) ? transportIcon(r.type) : Ticket
              return (
                <button type="button" key={r.id} onClick={() => toggleLink(file, 'reservation_id', r.id)} style={{
                  width: '100%', textAlign: 'start', paddingBlock: 6, paddingInlineEnd: 10, paddingInlineStart: 20, background: isLinked ? 'var(--bg-hover)' : 'none',
                  border: 'none', cursor: 'pointer', fontSize: 'calc(13px * var(--fs-scale-body, 1))', color: 'var(--text-primary)',
                  borderRadius: 8, fontFamily: 'inherit', fontWeight: isLinked ? 600 : 400,
                  display: 'flex', alignItems: 'center', gap: 6,
                }}
                  onMouseEnter={e => e.currentTarget.style.background = 'var(--bg-hover)'}
                  onMouseLeave={e => e.currentTarget.style.background = isLinked ? 'var(--bg-hover)' : 'transparent'}>
                  <Icon size={12} style={{ flexShrink: 0, color: 'var(--text-muted)' }} />
                  <span style={{ overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap' }}>{r.title}</span>
                  {isLinked && <Check size={14} style={{ marginInlineStart: 'auto', flexShrink: 0, color: 'var(--accent)' }} />}
                </button>
              )
            }

            const bookingsSection = reservations.length > 0 && (
              <div style={{ flex: 1, minWidth: 0 }}>
                {bookingReservations.length > 0 && (
                  <>
                    <div style={{ fontSize: 'calc(11px * var(--fs-scale-caption, 1))', fontWeight: 600, color: 'var(--text-faint)', padding: '8px 10px 4px', textTransform: 'uppercase', letterSpacing: 0.5 }}>
                      {t('files.assignBooking')}
                    </div>
                    {bookingReservations.map(reservationBtn)}
                  </>
                )}
                {transportReservations.length > 0 && (
                  <>
                    <div style={{ fontSize: 'calc(11px * var(--fs-scale-caption, 1))', fontWeight: 600, color: 'var(--text-faint)', padding: '8px 10px 4px', textTransform: 'uppercase', letterSpacing: 0.5, marginTop: bookingReservations.length > 0 ? 4 : 0 }}>
                      {t('files.assignTransport')}
                    </div>
                    {transportReservations.map(reservationBtn)}
                  </>
                )}
              </div>
            )

            const hasBoth = placesSection && bookingsSection
            return (
              <div className={hasBoth ? 'md:flex' : ''}>
                <div className={hasBoth ? 'md:w-1/2' : ''} style={{ overflowY: 'auto', maxHeight: '55vh', paddingInlineEnd: hasBoth ? 6 : 0 }}>{placesSection}</div>
                {hasBoth && <div className="hidden md:block" style={{ width: 1, background: 'var(--border-primary)', flexShrink: 0 }} />}
                {hasBoth && <div className="block md:hidden" style={{ height: 1, background: 'var(--border-primary)', margin: '8px 0' }} />}
                <div className={hasBoth ? 'md:w-1/2' : ''} style={{ overflowY: 'auto', maxHeight: '55vh', paddingInlineStart: hasBoth ? 6 : 0 }}>{bookingsSection}</div>
              </div>
            )
          })()}
        </div>
    </DialogShell>
  )
}