'use client'

import { Suspense, useState } from 'react'
import Link from 'next/link'
import { useRouter, useSearchParams } from 'next/navigation'
import { trpc } from '@/lib/trpc/client'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import { Textarea } from '@/components/ui/textarea'
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card'
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select'
import { Skeleton } from '@/components/ui/skeleton'
import { TagInput } from '@/components/shared/tag-input'
import { CountrySelect } from '@/components/ui/country-select'
import { PhoneInput } from '@/components/ui/phone-input'
import { toast } from 'sonner'
import {
  ArrowLeft,
  Save,
  Loader2,
  AlertCircle,
  FolderPlus,
} from 'lucide-react'

function NewProjectPageContent() {
  const router = useRouter()
  const searchParams = useSearchParams()
  const roundIdParam = searchParams.get('round')
  const programIdParam = searchParams.get('program')

  const [selectedProgramId, setSelectedProgramId] = useState<string>(programIdParam || '')
  const [selectedRoundId, setSelectedRoundId] = useState<string>(roundIdParam || '')

  // Form state
  const [title, setTitle] = useState('')
  const [teamName, setTeamName] = useState('')
  const [description, setDescription] = useState('')
  const [tags, setTags] = useState<string[]>([])
  const [contactEmail, setContactEmail] = useState('')
  const [contactName, setContactName] = useState('')
  const [contactPhone, setContactPhone] = useState('')
  const [country, setCountry] = useState('')
  const [city, setCity] = useState('')
  const [institution, setInstitution] = useState('')
  const [competitionCategory, setCompetitionCategory] = useState<string>('')
  const [oceanIssue, setOceanIssue] = useState<string>('')

  // Fetch programs
  const { data: programs, isLoading: loadingPrograms } = trpc.program.list.useQuery({
    status: 'ACTIVE',
    includeRounds: true,
  })

  // Fetch wizard config for selected program (dropdown options)
  const { data: wizardConfig } = trpc.program.getWizardConfig.useQuery(
    { programId: selectedProgramId },
    { enabled: !!selectedProgramId }
  )

  // Create mutation
  const utils = trpc.useUtils()
  const createProject = trpc.project.create.useMutation({
    onSuccess: () => {
      toast.success('Project created successfully')
      utils.project.list.invalidate()
      utils.round.get.invalidate()
      router.push('/admin/projects')
    },
    onError: (error) => {
      toast.error(error.message)
    },
  })

  // Get rounds for selected program
  const selectedProgram = programs?.find((p) => p.id === selectedProgramId)
  const rounds = selectedProgram?.rounds || []

  // Get dropdown options from wizard config
  const categoryOptions = wizardConfig?.competitionCategories || []
  const oceanIssueOptions = wizardConfig?.oceanIssues || []

  const handleSubmit = () => {
    if (!title.trim()) {
      toast.error('Please enter a project title')
      return
    }
    if (!selectedProgramId) {
      toast.error('Please select a program')
      return
    }

    createProject.mutate({
      programId: selectedProgramId,
      roundId: selectedRoundId || undefined,
      title: title.trim(),
      teamName: teamName.trim() || undefined,
      description: description.trim() || undefined,
      tags: tags.length > 0 ? tags : undefined,
      country: country || undefined,
      competitionCategory: competitionCategory as 'STARTUP' | 'BUSINESS_CONCEPT' | undefined || undefined,
      oceanIssue: oceanIssue as 'POLLUTION_REDUCTION' | 'CLIMATE_MITIGATION' | 'TECHNOLOGY_INNOVATION' | 'SUSTAINABLE_SHIPPING' | 'BLUE_CARBON' | 'HABITAT_RESTORATION' | 'COMMUNITY_CAPACITY' | 'SUSTAINABLE_FISHING' | 'CONSUMER_AWARENESS' | 'OCEAN_ACIDIFICATION' | 'OTHER' | undefined || undefined,
      institution: institution.trim() || undefined,
      contactPhone: contactPhone.trim() || undefined,
      contactEmail: contactEmail.trim() || undefined,
      contactName: contactName.trim() || undefined,
      city: city.trim() || undefined,
    })
  }

  if (loadingPrograms) {
    return <NewProjectPageSkeleton />
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center gap-4">
        <Button variant="ghost" asChild className="-ml-4">
          <Link href="/admin/projects">
            <ArrowLeft className="mr-2 h-4 w-4" />
            Back to Projects
          </Link>
        </Button>
      </div>

      <div className="flex items-center gap-2">
        <FolderPlus className="h-6 w-6 text-primary" />
        <div>
          <h1 className="text-2xl font-semibold tracking-tight">Add Project</h1>
          <p className="text-muted-foreground">
            Manually create a new project submission
          </p>
        </div>
      </div>

      {/* Program & Round selection */}
      <Card>
        <CardHeader>
          <CardTitle>Program & Round</CardTitle>
          <CardDescription>
            Select the program for this project. Round assignment is optional.
          </CardDescription>
        </CardHeader>
        <CardContent className="space-y-4">
          {!programs || programs.length === 0 ? (
            <div className="flex flex-col items-center justify-center py-8 text-center">
              <AlertCircle className="h-12 w-12 text-muted-foreground/50" />
              <p className="mt-2 font-medium">No Active Programs</p>
              <p className="text-sm text-muted-foreground">
                Create a program first before adding projects
              </p>
            </div>
          ) : (
            <div className="grid gap-4 sm:grid-cols-2">
              <div className="space-y-2">
                <Label>Program *</Label>
                <Select value={selectedProgramId} onValueChange={(v) => {
                  setSelectedProgramId(v)
                  setSelectedRoundId('') // Reset round on program change
                }}>
                  <SelectTrigger>
                    <SelectValue placeholder="Select a program" />
                  </SelectTrigger>
                  <SelectContent>
                    {programs.map((p) => (
                      <SelectItem key={p.id} value={p.id}>
                        {p.name} {p.year}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              </div>

              <div className="space-y-2">
                <Label>Round (optional)</Label>
                <Select value={selectedRoundId || '__none__'} onValueChange={(v) => setSelectedRoundId(v === '__none__' ? '' : v)} disabled={!selectedProgramId}>
                  <SelectTrigger>
                    <SelectValue placeholder="No round assigned" />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="__none__">No round assigned</SelectItem>
                    {rounds.map((r: { id: string; name: string }) => (
                      <SelectItem key={r.id} value={r.id}>
                        {r.name}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              </div>
            </div>
          )}
        </CardContent>
      </Card>

      {selectedProgramId && (
        <>
          <div className="grid gap-6 lg:grid-cols-2">
            {/* Basic Info */}
            <Card>
              <CardHeader>
                <CardTitle>Project Details</CardTitle>
                <CardDescription>
                  Basic information about the project
                </CardDescription>
              </CardHeader>
              <CardContent className="space-y-4">
                <div className="space-y-2">
                  <Label htmlFor="title">Project Title *</Label>
                  <Input
                    id="title"
                    value={title}
                    onChange={(e) => setTitle(e.target.value)}
                    placeholder="e.g., Ocean Cleanup Initiative"
                  />
                </div>

                <div className="space-y-2">
                  <Label htmlFor="teamName">Team/Organization Name</Label>
                  <Input
                    id="teamName"
                    value={teamName}
                    onChange={(e) => setTeamName(e.target.value)}
                    placeholder="e.g., Blue Ocean Foundation"
                  />
                </div>

                <div className="space-y-2">
                  <Label htmlFor="description">Description</Label>
                  <Textarea
                    id="description"
                    value={description}
                    onChange={(e) => setDescription(e.target.value)}
                    placeholder="Brief description of the project..."
                    rows={4}
                    maxLength={2000}
                  />
                </div>

                <div className="space-y-2">
                  <Label>Tags</Label>
                  <TagInput
                    value={tags}
                    onChange={setTags}
                    placeholder="Select project tags..."
                    maxTags={10}
                  />
                </div>

                {categoryOptions.length > 0 && (
                  <div className="space-y-2">
                    <Label>Competition Category</Label>
                    <Select value={competitionCategory} onValueChange={setCompetitionCategory}>
                      <SelectTrigger>
                        <SelectValue placeholder="Select category..." />
                      </SelectTrigger>
                      <SelectContent>
                        {categoryOptions.map((opt: { value: string; label: string }) => (
                          <SelectItem key={opt.value} value={opt.value}>
                            {opt.label}
                          </SelectItem>
                        ))}
                      </SelectContent>
                    </Select>
                  </div>
                )}

                {oceanIssueOptions.length > 0 && (
                  <div className="space-y-2">
                    <Label>Ocean Issue</Label>
                    <Select value={oceanIssue} onValueChange={setOceanIssue}>
                      <SelectTrigger>
                        <SelectValue placeholder="Select ocean issue..." />
                      </SelectTrigger>
                      <SelectContent>
                        {oceanIssueOptions.map((opt: { value: string; label: string }) => (
                          <SelectItem key={opt.value} value={opt.value}>
                            {opt.label}
                          </SelectItem>
                        ))}
                      </SelectContent>
                    </Select>
                  </div>
                )}

                <div className="space-y-2">
                  <Label htmlFor="institution">Institution</Label>
                  <Input
                    id="institution"
                    value={institution}
                    onChange={(e) => setInstitution(e.target.value)}
                    placeholder="e.g., University of Monaco"
                  />
                </div>
              </CardContent>
            </Card>

            {/* Contact Info */}
            <Card>
              <CardHeader>
                <CardTitle>Contact Information</CardTitle>
                <CardDescription>
                  Contact details for the project team
                </CardDescription>
              </CardHeader>
              <CardContent className="space-y-4">
                <div className="space-y-2">
                  <Label htmlFor="contactName">Contact Name</Label>
                  <Input
                    id="contactName"
                    value={contactName}
                    onChange={(e) => setContactName(e.target.value)}
                    placeholder="e.g., John Smith"
                  />
                </div>

                <div className="space-y-2">
                  <Label htmlFor="contactEmail">Contact Email</Label>
                  <Input
                    id="contactEmail"
                    type="email"
                    value={contactEmail}
                    onChange={(e) => setContactEmail(e.target.value)}
                    placeholder="e.g., john@example.com"
                  />
                </div>

                <div className="space-y-2">
                  <Label>Contact Phone</Label>
                  <PhoneInput
                    value={contactPhone}
                    onChange={setContactPhone}
                    defaultCountry="MC"
                  />
                </div>

                <div className="space-y-2">
                  <Label>Country</Label>
                  <CountrySelect
                    value={country}
                    onChange={setCountry}
                  />
                </div>

                <div className="space-y-2">
                  <Label htmlFor="city">City</Label>
                  <Input
                    id="city"
                    value={city}
                    onChange={(e) => setCity(e.target.value)}
                    placeholder="e.g., Monaco"
                  />
                </div>
              </CardContent>
            </Card>
          </div>

          {/* Actions */}
          <div className="flex justify-end gap-4">
            <Button variant="outline" asChild>
              <Link href="/admin/projects">Cancel</Link>
            </Button>
            <Button
              onClick={handleSubmit}
              disabled={createProject.isPending || !title.trim() || !selectedProgramId}
            >
              {createProject.isPending ? (
                <Loader2 className="mr-2 h-4 w-4 animate-spin" />
              ) : (
                <Save className="mr-2 h-4 w-4" />
              )}
              Create Project
            </Button>
          </div>
        </>
      )}
    </div>
  )
}

function NewProjectPageSkeleton() {
  return (
    <div className="space-y-6">
      <div className="flex items-center gap-4">
        <Skeleton className="h-9 w-32" />
      </div>
      <Skeleton className="h-8 w-48" />
      <Card>
        <CardHeader>
          <Skeleton className="h-6 w-32" />
          <Skeleton className="h-4 w-64" />
        </CardHeader>
        <CardContent>
          <Skeleton className="h-10 w-full" />
        </CardContent>
      </Card>
    </div>
  )
}

export default function NewProjectPage() {
  return (
    <Suspense fallback={<NewProjectPageSkeleton />}>
      <NewProjectPageContent />
    </Suspense>
  )
}