import { useMemo, useRef, useState } from 'react'
import { downloadDiagramFile, readDiagramFile, DiagramImportError } from '../../data/exportImport'
import { supabase } from '../../data/supabaseClient'
import { useAdminReviewStore } from '../../state/adminReviewStore'
import { useAuthStore } from '../../state/authStore'
import { useDiagramStore } from '../../state/diagramStore'
import { useSubmissionStore } from '../../state/submissionStore'
import AdminUsersModal from '../admin/AdminUsersModal'
import DiagramSharingModal from '../sharing/DiagramSharingModal'
import VersionHistoryModal from '../sharing/VersionHistoryModal'
import AdminReviewModal from '../submissions/AdminReviewModal'
import MySubmissionsModal from '../submissions/MySubmissionsModal'
import DiagramManagerModal from './DiagramManagerModal'

// When "My Submissions" was last opened — a per-user UI preference (like
// hiddenPublicDeviceTemplateIds in catalogStore), used to badge outcomes
// (approved/rejected) you haven't seen yet without a server-side
// notifications table.
const LAST_SEEN_SUBMISSIONS_KEY = 'av-planner:lastSeenSubmissionsAt'
function getLastSeenSubmissionsAt(): string {
  try {
    return window.localStorage.getItem(LAST_SEEN_SUBMISSIONS_KEY) ?? ''
  } catch {
    return ''
  }
}
function setLastSeenSubmissionsAt(iso: string): void {
  try {
    window.localStorage.setItem(LAST_SEEN_SUBMISSIONS_KEY, iso)
  } catch {
    // Not essential — worst case an already-seen outcome stays badged.
  }
}

export default function TopBar() {
  const diagram = useDiagramStore((s) => s.diagram)
  const access = useDiagramStore((s) => s.access)
  const canEdit = access?.myPermission !== 'view'
  const renameDiagram = useDiagramStore((s) => s.renameDiagram)
  const importDiagram = useDiagramStore((s) => s.importDiagram)
  const mySubmissions = useSubmissionStore((s) => s.mySubmissions)
  const username = useAuthStore((s) => s.username)
  const role = useAuthStore((s) => s.role)
  const isAdmin = role === 'admin' || role === 'super_admin'
  const isSuperAdmin = role === 'super_admin'
  const adminPendingCount = useAdminReviewStore((s) => s.allSubmissions.filter((sub) => sub.status === 'pending').length)
  const fileInputRef = useRef<HTMLInputElement>(null)
  const [diagramManagerOpen, setDiagramManagerOpen] = useState(false)
  const [versionHistoryOpen, setVersionHistoryOpen] = useState(false)
  const [sharingOpen, setSharingOpen] = useState(false)
  const [submissionsOpen, setSubmissionsOpen] = useState(false)
  const [adminReviewOpen, setAdminReviewOpen] = useState(false)
  const [adminUsersOpen, setAdminUsersOpen] = useState(false)

  const pendingSubmissionCount = useMemo(
    () => mySubmissions.filter((s) => s.status === 'pending').length,
    [mySubmissions],
  )
  const unseenOutcomeCount = useMemo(() => {
    const lastSeen = getLastSeenSubmissionsAt()
    return mySubmissions.filter((s) => s.status !== 'pending' && s.updatedAt > lastSeen).length
  }, [mySubmissions])

  const openMySubmissions = () => {
    setSubmissionsOpen(true)
    setLastSeenSubmissionsAt(new Date().toISOString())
  }

  const handleExport = () => downloadDiagramFile(diagram)

  const handleImportClick = () => fileInputRef.current?.click()

  const handleFileChange = async (event: React.ChangeEvent<HTMLInputElement>) => {
    const file = event.target.files?.[0]
    event.target.value = ''
    if (!file) return
    try {
      const imported = await readDiagramFile(file)
      await importDiagram(imported)
    } catch (err) {
      const message = err instanceof DiagramImportError ? err.message : 'Could not read that file.'
      window.alert(`Import failed: ${message}`)
    }
  }

  return (
    <header className="flex h-12 shrink-0 items-center justify-between border-b border-slate-200 bg-white px-3">
      <div className="flex items-center gap-2">
        <span className="text-sm font-semibold text-indigo-700">AV Planner</span>
        <input
          value={diagram.name}
          onChange={(e) => renameDiagram(e.target.value)}
          disabled={!canEdit}
          className="rounded border border-transparent px-2 py-1 text-sm text-slate-700 hover:border-slate-200 focus:border-slate-300 focus:outline-none disabled:cursor-not-allowed disabled:opacity-60"
        />
      </div>
      <div className="flex items-center gap-1.5">
        <button
          onClick={() => setDiagramManagerOpen(true)}
          className="rounded px-2.5 py-1.5 text-xs text-slate-600 hover:bg-slate-100"
        >
          Diagrams
        </button>
        <button
          onClick={() => setVersionHistoryOpen(true)}
          className="rounded px-2.5 py-1.5 text-xs text-slate-600 hover:bg-slate-100"
        >
          History
        </button>
        <button
          onClick={() => setSharingOpen(true)}
          className="rounded px-2.5 py-1.5 text-xs text-slate-600 hover:bg-slate-100"
        >
          Share
        </button>
        <button onClick={openMySubmissions} className="rounded px-2.5 py-1.5 text-xs text-slate-600 hover:bg-slate-100">
          My Submissions
          {unseenOutcomeCount > 0 ? (
            <span
              className="ml-1 rounded-full bg-indigo-100 px-1.5 py-0.5 text-[10px] font-semibold text-indigo-700"
              title="Submission(s) reviewed since you last checked"
            >
              {unseenOutcomeCount}
            </span>
          ) : (
            pendingSubmissionCount > 0 && (
              <span className="ml-1 rounded-full bg-amber-100 px-1.5 py-0.5 text-[10px] font-semibold text-amber-700">
                {pendingSubmissionCount}
              </span>
            )
          )}
        </button>
        {isAdmin && (
          <button
            onClick={() => setAdminReviewOpen(true)}
            className="rounded px-2.5 py-1.5 text-xs text-slate-600 hover:bg-slate-100"
          >
            Review Queue
            {adminPendingCount > 0 && (
              <span className="ml-1 rounded-full bg-amber-100 px-1.5 py-0.5 text-[10px] font-semibold text-amber-700">
                {adminPendingCount}
              </span>
            )}
          </button>
        )}
        {isSuperAdmin && (
          <button
            onClick={() => setAdminUsersOpen(true)}
            className="rounded px-2.5 py-1.5 text-xs text-slate-600 hover:bg-slate-100"
          >
            Manage Users
          </button>
        )}
        <button onClick={handleImportClick} className="rounded px-2.5 py-1.5 text-xs text-slate-600 hover:bg-slate-100">
          Import
        </button>
        <input ref={fileInputRef} type="file" accept="application/json,.json" className="hidden" onChange={handleFileChange} />
        <button
          onClick={handleExport}
          className="rounded bg-indigo-600 px-2.5 py-1.5 text-xs font-medium text-white hover:bg-indigo-500"
        >
          Export
        </button>
        {username && <span className="ml-1 text-xs text-slate-400">{username}</span>}
        <button
          onClick={() => supabase.auth.signOut()}
          className="rounded px-2.5 py-1.5 text-xs text-slate-500 hover:bg-slate-100"
        >
          Sign out
        </button>
      </div>
      {diagramManagerOpen && <DiagramManagerModal onClose={() => setDiagramManagerOpen(false)} />}
      {versionHistoryOpen && <VersionHistoryModal onClose={() => setVersionHistoryOpen(false)} />}
      {sharingOpen && <DiagramSharingModal onClose={() => setSharingOpen(false)} />}
      {submissionsOpen && <MySubmissionsModal onClose={() => setSubmissionsOpen(false)} />}
      {adminReviewOpen && <AdminReviewModal onClose={() => setAdminReviewOpen(false)} />}
      {adminUsersOpen && <AdminUsersModal onClose={() => setAdminUsersOpen(false)} />}
    </header>
  )
}