'use client'

import Link from 'next/link'
import type { Route } from 'next'
import { trpc } from '@/lib/trpc/client'
import { Card, CardContent } from '@/components/ui/card'
import { Button } from '@/components/ui/button'
import {
  CircleDot,
  AlertTriangle,
  Upload,
  UserPlus,
  Settings,
  ClipboardCheck,
  Users,
  Send,
  FileDown,
  Calendar,
  Eye,
  Presentation,
  Vote,
  Play,
  Lock,
} from 'lucide-react'
import { GeographicSummaryCard } from '@/components/charts'
import { AnimatedCard } from '@/components/shared/animated-container'
import { motion } from 'motion/react'

import { CompetitionPipeline } from '@/components/dashboard/competition-pipeline'
import { RoundStats } from '@/components/dashboard/round-stats'
import { ActiveRoundPanel } from '@/components/dashboard/active-round-panel'
import { SmartActions } from '@/components/dashboard/smart-actions'
import { ProjectListCompact } from '@/components/dashboard/project-list-compact'
import { ActivityFeed } from '@/components/dashboard/activity-feed'
import { CategoryBreakdown } from '@/components/dashboard/category-breakdown'
import { DashboardSkeleton } from '@/components/dashboard/dashboard-skeleton'
import { RecentEvaluations } from '@/components/dashboard/recent-evaluations'
import { RoundUserTracker } from '@/components/dashboard/round-user-tracker'

type DashboardContentProps = {
  editionId: string
  sessionName: string
}

type QuickAction = {
  label: string
  href: string
  icon: React.ElementType
}

function getContextualActions(
  activeRound: { id: string; roundType: string } | null
): QuickAction[] {
  if (!activeRound) {
    return [
      { label: 'Rounds', href: '/admin/rounds', icon: CircleDot },
      { label: 'Import', href: '/admin/projects/new', icon: Upload },
      { label: 'Invite', href: '/admin/members', icon: UserPlus },
    ]
  }

  const roundHref = `/admin/rounds/${activeRound.id}`

  switch (activeRound.roundType) {
    case 'INTAKE':
      return [
        { label: 'Import Projects', href: '/admin/projects/new', icon: Upload },
        { label: 'Review', href: roundHref, icon: ClipboardCheck },
        { label: 'Configure', href: `${roundHref}?tab=config`, icon: Settings },
      ]
    case 'FILTERING':
      return [
        { label: 'Run Screening', href: roundHref, icon: ClipboardCheck },
        { label: 'Review Results', href: `${roundHref}?tab=filtering`, icon: Eye },
        { label: 'Configure', href: `${roundHref}?tab=config`, icon: Settings },
      ]
    case 'EVALUATION':
      return [
        { label: 'Assignments', href: `${roundHref}?tab=assignments`, icon: Users },
        { label: 'Send Reminders', href: `${roundHref}?tab=assignments`, icon: Send },
        { label: 'Export', href: roundHref, icon: FileDown },
      ]
    case 'SUBMISSION':
      return [
        { label: 'Submissions', href: roundHref, icon: ClipboardCheck },
        { label: 'Deadlines', href: `${roundHref}?tab=config`, icon: Calendar },
        { label: 'Status', href: `${roundHref}?tab=projects`, icon: Eye },
      ]
    case 'MENTORING':
      return [
        { label: 'Mentors', href: `${roundHref}?tab=projects`, icon: Users },
        { label: 'Progress', href: roundHref, icon: Eye },
        { label: 'Configure', href: `${roundHref}?tab=config`, icon: Settings },
      ]
    case 'LIVE_FINAL':
      return [
        { label: 'Live Control', href: roundHref, icon: Presentation },
        { label: 'Results', href: `${roundHref}?tab=projects`, icon: Vote },
        { label: 'Configure', href: `${roundHref}?tab=config`, icon: Settings },
      ]
    case 'DELIBERATION':
      return [
        { label: 'Sessions', href: roundHref, icon: Play },
        { label: 'Results', href: `${roundHref}?tab=projects`, icon: Eye },
        { label: 'Lock Results', href: roundHref, icon: Lock },
      ]
    default:
      return [
        { label: 'Rounds', href: '/admin/rounds', icon: CircleDot },
        { label: 'Import', href: '/admin/projects/new', icon: Upload },
        { label: 'Invite', href: '/admin/members', icon: UserPlus },
      ]
  }
}

export function DashboardContent({ editionId, sessionName }: DashboardContentProps) {
  const { data, isLoading, error } = trpc.dashboard.getStats.useQuery(
    { editionId },
    { enabled: !!editionId, refetchInterval: 60_000 }
  )
  const { data: recentEvals } = trpc.dashboard.getRecentEvaluations.useQuery(
    { editionId, limit: 8 },
    { enabled: !!editionId, refetchInterval: 60_000 }
  )
  const { data: liveActivity } = trpc.dashboard.getRecentActivity.useQuery(
    { limit: 8 },
    { enabled: !!editionId, refetchInterval: 30_000 }
  )
  // Round User Tracker is self-contained — it fetches its own data

  if (isLoading) {
    return <DashboardSkeleton />
  }

  if (error) {
    return (
      <Card>
        <CardContent className="flex flex-col items-center justify-center py-12 text-center">
          <AlertTriangle className="h-12 w-12 text-destructive/50" />
          <p className="mt-2 font-medium">Failed to load dashboard</p>
          <p className="text-sm text-muted-foreground">
            {error.message || 'An unexpected error occurred. Please try refreshing the page.'}
          </p>
        </CardContent>
      </Card>
    )
  }

  if (!data) {
    return (
      <Card>
        <CardContent className="flex flex-col items-center justify-center py-12 text-center">
          <CircleDot className="h-12 w-12 text-muted-foreground/50" />
          <p className="mt-2 font-medium">Edition not found</p>
          <p className="text-sm text-muted-foreground">
            The selected edition could not be found
          </p>
        </CardContent>
      </Card>
    )
  }

  const {
    edition,
    pipelineRounds,
    activeRoundId,
    nextActions,
    projectCount,
    newProjectsThisWeek,
    totalJurors,
    activeJurors,
    evaluationStats,
    totalAssignments,
    latestProjects,
    recentlyActiveProjects,
    categoryBreakdown,
    oceanIssueBreakdown,
    recentActivity,
  } = data

  const activeRound = activeRoundId
    ? pipelineRounds.find((r) => r.id === activeRoundId) ?? null
    : null

  // Find next draft round for summary panel
  const lastActiveSortOrder = Math.max(
    ...pipelineRounds.filter((r) => r.status === 'ROUND_ACTIVE').map((r) => r.sortOrder),
    -1
  )
  const nextDraftRound = pipelineRounds.find(
    (r) => r.status === 'ROUND_DRAFT' && r.sortOrder > lastActiveSortOrder
  ) ?? null

  const quickActions = getContextualActions(activeRound)

  return (
    <>
      {/* Page Header */}
      <motion.div
        initial={{ opacity: 0, y: -6 }}
        animate={{ opacity: 1, y: 0 }}
        transition={{ duration: 0.3 }}
        className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between"
      >
        <div>
          <h1 className="text-xl font-bold tracking-tight md:text-2xl">
            {edition.name} {edition.year}
          </h1>
          <p className="text-sm text-muted-foreground">
            Welcome back, {sessionName}
          </p>
        </div>
        <div className="flex flex-wrap gap-2">
          {quickActions.map((action) => (
            <Link key={action.label} href={action.href as Route}>
              <Button size="sm" variant="outline">
                <action.icon className="mr-1.5 h-3.5 w-3.5" />
                {action.label}
              </Button>
            </Link>
          ))}
        </div>
      </motion.div>

      {/* Competition Pipeline */}
      <AnimatedCard index={0}>
        <CompetitionPipeline rounds={pipelineRounds} />
      </AnimatedCard>

      {/* Round-Specific Stats */}
      <AnimatedCard index={1}>
        <RoundStats
          activeRound={activeRound}
          projectCount={projectCount}
          newProjectsThisWeek={newProjectsThisWeek}
          totalJurors={totalJurors}
          activeJurors={activeJurors}
          totalAssignments={totalAssignments}
          evaluationStats={evaluationStats}
          actionsCount={nextActions.length}
          nextDraftRound={nextDraftRound ? { name: nextDraftRound.name, roundType: nextDraftRound.roundType } : null}
        />
      </AnimatedCard>

      {/* Two-Column Layout */}
      <div className="grid gap-6 lg:grid-cols-12">
        {/* Left Column */}
        <div className="space-y-6 lg:col-span-8">
          {activeRound && (
            <AnimatedCard index={2}>
              <ActiveRoundPanel round={activeRound} />
            </AnimatedCard>
          )}

          <AnimatedCard index={3}>
            <ProjectListCompact
              projects={latestProjects}
              activeProjects={recentlyActiveProjects}
              mode={activeRound && activeRound.roundType !== 'INTAKE' ? 'active' : 'recent'}
            />
          </AnimatedCard>

          {recentEvals && recentEvals.length > 0 && (
            <AnimatedCard index={4}>
              <RecentEvaluations evaluations={recentEvals} />
            </AnimatedCard>
          )}
        </div>

        {/* Right Column */}
        <div className="space-y-6 lg:col-span-4">
          <AnimatedCard index={5}>
            <SmartActions actions={nextActions} />
          </AnimatedCard>

          <AnimatedCard index={6}>
            <RoundUserTracker editionId={editionId} />
          </AnimatedCard>

          <AnimatedCard index={7}>
            <ActivityFeed activity={liveActivity ?? recentActivity} />
          </AnimatedCard>
        </div>
      </div>

      {/* Bottom Full Width */}
      <div className="grid gap-6 lg:grid-cols-12">
        <div className="lg:col-span-8">
          <AnimatedCard index={8}>
            <GeographicSummaryCard programId={editionId} />
          </AnimatedCard>
        </div>
        <div className="lg:col-span-4">
          <AnimatedCard index={9}>
            <CategoryBreakdown
              categories={categoryBreakdown}
              issues={oceanIssueBreakdown}
            />
          </AnimatedCard>
        </div>
      </div>
    </>
  )
}
