import { useId, useState } from 'react'
import { CalendarDays, CalendarPlus, ChevronRight, Download, FileText, Loader2, MapPin, Route as RouteIcon, UserRound } from 'lucide-react'
import type { LucideIcon } from 'lucide-react'
import { DialogHeader, DialogSection, DialogShell, DialogTile, NEUTRAL_TINT, fs } from '../shared/DialogShell'
import { IcsSubscribeModal } from './IcsSubscribeModal'
import { SoftPill } from './planParts'
import { useToast } from '../shared/Toast'
import type { Trip, Day, Place, Category, AssignmentsMap, Reservation, DayNote } from '../../types'
import { useTripExport } from './useTripExport'

/**
 * What a GPX download can carry. Worded by what someone wants on their device
 * rather than by the GPX element it maps to: "everything", "just the places" for
 * an offline map, "just the days" for following a plan. An omitted flag defaults
 * to true server-side, so the first entry needs no query at all.
 */
const GPX_SCOPES = [
  { key: 'all', query: '', labelKey: 'dayplan.gpxAll', icon: Download },
  { key: 'places', query: '?dayRoutes=false', labelKey: 'dayplan.gpxPlaces', icon: MapPin },
  { key: 'days', query: '?waypoints=false&tracks=false', labelKey: 'dayplan.gpxDays', icon: RouteIcon },
] as const

interface TripExportModalProps {
  isOpen: boolean
  onClose: () => void
  tripId: number
  trip: Trip
  days: Day[]
  places: Place[]
  categories: Category[]
  assignments: AssignmentsMap
  reservations: Reservation[]
  dayNotes: Record<string, DayNote[]>
  t: (key: string, params?: Record<string, string | number>) => string
  locale: string
  toast: ReturnType<typeof useToast>
  /**
   * Gates "Subscribe to calendar" only. The one-off ICS download above it stays
   * open to every member: it is a file they already have the right to read,
   * while the subscription mints a link that works without an account.
   */
  canManageShare?: boolean
}

/**
 * Every way a trip leaves TREK, in one dialog: the day plan as a PDF, the
 * bookings as a calendar (a one-off .ics or a live subscription) and the map
 * data as GPX in the three scopes a device actually wants.
 *
 * It replaces three separate toolbar buttons, two of which opened hover menus of
 * their own. On a narrow sidebar that row simply ran out of width and the
 * exports dropped off the edge; one button cannot.
 */
export function TripExportModal({
  isOpen, onClose, tripId, trip, days, places, categories, assignments, reservations, dayNotes,
  t, locale, toast, canManageShare = true,
}: TripExportModalProps) {
  const [subscribeOpen, setSubscribeOpen] = useState(false)
  const titleId = useId()
  const {
    fileBase, offerMine, isRunning, anyRunning, exportPdf, downloadIcs, downloadGpx,
  } = useTripExport({
    tripId,
    data: { trip, days, places, assignments, categories, reservations, dayNotes },
    t,
    locale,
    toast,
    exclusive: true,
    onExported: onClose,
    requireTrip: false,
    closeAfterPdf: true,
    logPdfErrors: true,
  })

  const header = (
    <DialogHeader
      tile={<DialogTile><Download size={20} strokeWidth={1.9} className="text-content-muted" /></DialogTile>}
      tint={NEUTRAL_TINT}
      labelId={titleId}
      onClose={onClose}
      title={t('dayplan.export')}
      sub={t('dayplan.exportIntro')}
      subWraps
    />
  )

  return (
    <>
      {/* While the subscription dialog sits on top, Escape and the backdrop are
          its own: one key press closes only the dialog in front. */}
      <DialogShell open={isOpen} onClose={onClose} labelledBy={titleId} width="narrow" blocked={subscribeOpen} header={header}>
        <DialogSection label={t('dayplan.exportDocument')}>
          <div className="flex flex-col gap-1.5">
            <ExportRow
              icon={FileText}
              title={t('dayplan.pdf')}
              sub={t('dayplan.pdfTooltip')}
              busy={isRunning('pdf')}
              disabled={anyRunning}
              onClick={() => exportPdf()}
            />
            {offerMine && (
              <ExportRow
                icon={UserRound}
                title={t('dayplan.pdfMine')}
                sub={t('dayplan.pdfMineSub')}
                busy={isRunning('pdf:mine')}
                disabled={anyRunning}
                onClick={() => exportPdf(true)}
              />
            )}
          </div>
        </DialogSection>

        <DialogSection label={t('dayplan.exportCalendar')}>
          <div className="flex flex-col gap-1.5">
            <ExportRow
              icon={CalendarDays}
              title={t('mobileTrip.icsDownload')}
              sub={`${fileBase}.ics`}
              busy={isRunning('ics')}
              disabled={anyRunning}
              onClick={downloadIcs}
            />
            {canManageShare && (
              <ExportRow
                icon={CalendarPlus}
                title={t('mobileTrip.icsSubscribe')}
                sub={t('mobileTrip.icsSubscribeSub')}
                disabled={anyRunning}
                onClick={() => setSubscribeOpen(true)}
              />
            )}
          </div>
        </DialogSection>

        {/* GPX: the counterpart to the GPX import in the places sidebar. The
            format name carries more than a translated heading would, so it
            stands beside the plain-language one as a pill of its own. */}
        <DialogSection label={<span className="inline-flex items-center gap-1.5">{t('dayplan.exportMaps')}<SoftPill caps>GPX</SoftPill></span>}>
          <div className="flex flex-col gap-1.5">
            {GPX_SCOPES.map(scope => (
              <ExportRow
                key={scope.key}
                icon={scope.icon}
                title={t(scope.labelKey)}
                busy={isRunning(`gpx:${scope.key}`)}
                disabled={anyRunning}
                onClick={() => downloadGpx(scope.key, scope.query)}
              />
            ))}
          </div>
        </DialogSection>
      </DialogShell>

      {/* Mounted after the export dialog, so its backdrop stacks above it. */}
      {subscribeOpen && canManageShare && (
        <IcsSubscribeModal
          endpoint={`/api/trips/${tripId}/feed`}
          title={t('mobileTrip.icsSubscribe')}
          description={t('mobileTrip.icsSubscribeSub')}
          onClose={() => setSubscribeOpen(false)}
        />
      )}
    </>
  )
}

/** One export as a card: its icon tile (a spinner while it works), what it makes, and the chevron. */
function ExportRow({ icon: Icon, title, sub, busy = false, disabled = false, onClick }: {
  icon: LucideIcon
  title: string
  sub?: string
  busy?: boolean
  disabled?: boolean
  onClick: () => void
}) {
  return (
    <button
      type="button"
      onClick={onClick}
      disabled={disabled}
      className="group flex w-full items-center gap-3 rounded-[14px] border border-edge-faint bg-surface-card px-3 py-2.5 text-start transition-colors enabled:hover:bg-surface-hover disabled:cursor-default disabled:opacity-50"
    >
      <span className="grid h-9 w-9 flex-none place-items-center rounded-[10px] bg-surface-tertiary text-content-secondary transition-colors group-enabled:group-hover:bg-surface-card group-enabled:group-hover:text-content">
        {busy ? <Loader2 size={16} strokeWidth={2} className="animate-spin" /> : <Icon size={16} strokeWidth={1.9} />}
      </span>
      <span className="min-w-0 flex-1">
        <span className="block truncate font-semibold text-content" style={fs(13.5, 'body')}>{title}</span>
        {sub && <span className="block truncate text-content-muted" style={fs(11.5)}>{sub}</span>}
      </span>
      <ChevronRight size={15} strokeWidth={2} className="flex-none text-content-faint transition-transform group-enabled:group-hover:translate-x-0.5" />
    </button>
  )
}