'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 { Avatar, AvatarFallback } from '@/components/ui/avatar'
import { Badge } from '@/components/ui/badge'
import { Checkbox } from '@/components/ui/checkbox'
import { Separator } from '@/components/ui/separator'
import { toast } from 'sonner'
import {
  ArrowLeft,
  Save,
  Loader2,
  AlertCircle,
  FolderPlus,
  Users,
  UserPlus,
  Trash2,
  Mail,
} from 'lucide-react'

type TeamMemberEntry = {
  id: string
  name: string
  email: string
  role: 'LEAD' | 'MEMBER' | 'ADVISOR'
  title: string
  phone: string
  sendInvite: boolean
}

const ROLE_COLORS: Record<string, string> = {
  LEAD: 'bg-red-100 text-red-700',
  MEMBER: 'bg-teal-100 text-teal-700',
  ADVISOR: 'bg-blue-100 text-blue-700',
}

const ROLE_AVATAR_COLORS: Record<string, string> = {
  LEAD: 'bg-red-100 text-red-700',
  MEMBER: 'bg-teal-100 text-teal-700',
  ADVISOR: 'bg-blue-100 text-blue-700',
}

const ROLE_LABELS: Record<string, string> = {
  LEAD: 'Lead',
  MEMBER: 'Member',
  ADVISOR: 'Advisor',
}

function getInitials(name: string): string {
  return name
    .split(' ')
    .map((w) => w[0])
    .filter(Boolean)
    .slice(0, 2)
    .join('')
    .toUpperCase()
}

const ROLE_SORT_ORDER: Record<string, number> = { LEAD: 0, MEMBER: 1, ADVISOR: 2 }

function NewProjectPageContent() {
  const router = useRouter()
  const searchParams = useSearchParams()
  const roundIdParam = searchParams.get('stage')
  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 [country, setCountry] = useState('')
  const [institution, setInstitution] = useState('')
  const [competitionCategory, setCompetitionCategory] = useState<string>('')
  const [oceanIssue, setOceanIssue] = useState<string>('')

  // Team members state
  const [teamMembers, setTeamMembers] = useState<TeamMemberEntry[]>([])
  const [memberName, setMemberName] = useState('')
  const [memberEmail, setMemberEmail] = useState('')
  const [memberRole, setMemberRole] = useState<'LEAD' | 'MEMBER' | 'ADVISOR'>('MEMBER')
  const [memberTitle, setMemberTitle] = useState('')
  const [memberPhone, setMemberPhone] = useState('')
  const [memberSendInvite, setMemberSendInvite] = useState(false)

  // Fetch programs
  const { data: programs, isLoading: loadingPrograms } = trpc.program.list.useQuery({
    status: 'ACTIVE',
    includeStages: 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.program.get.invalidate()
      router.push('/admin/projects')
    },
    onError: (error) => {
      toast.error(error.message)
    },
  })

  // Get stages for selected program
  const selectedProgram = programs?.find((p) => p.id === selectedProgramId)
  const stages = (selectedProgram?.stages || []) as Array<{ id: string; name: string }>

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

  const handleAddMember = () => {
    if (!memberName.trim()) {
      toast.error('Please enter a member name')
      return
    }
    if (!memberEmail.trim()) {
      toast.error('Please enter a member email')
      return
    }
    // Basic email validation
    if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(memberEmail.trim())) {
      toast.error('Please enter a valid email address')
      return
    }
    // Check for duplicates
    if (teamMembers.some((m) => m.email.toLowerCase() === memberEmail.trim().toLowerCase())) {
      toast.error('A member with this email already exists')
      return
    }
    if (teamMembers.length >= 10) {
      toast.error('Maximum 10 team members allowed')
      return
    }

    setTeamMembers((prev) => [
      ...prev,
      {
        id: crypto.randomUUID(),
        name: memberName.trim(),
        email: memberEmail.trim(),
        role: memberRole,
        title: memberTitle.trim(),
        phone: memberPhone.trim(),
        sendInvite: memberSendInvite,
      },
    ])

    // Reset form
    setMemberName('')
    setMemberEmail('')
    setMemberRole('MEMBER')
    setMemberTitle('')
    setMemberPhone('')
    setMemberSendInvite(false)
  }

  const handleRemoveMember = (id: string) => {
    setTeamMembers((prev) => prev.filter((m) => m.id !== id))
  }

  const handleToggleInvite = (id: string) => {
    setTeamMembers((prev) =>
      prev.map((m) => (m.id === id ? { ...m, sendInvite: !m.sendInvite } : m))
    )
  }

  const sortedMembers = [...teamMembers].sort(
    (a, b) => (ROLE_SORT_ORDER[a.role] ?? 9) - (ROLE_SORT_ORDER[b.role] ?? 9)
  )

  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,
      teamMembers: teamMembers.length > 0
        ? teamMembers.map(({ name, email, role, title: t, phone, sendInvite }) => ({
            name,
            email,
            role,
            title: t || undefined,
            phone: phone || undefined,
            sendInvite,
          }))
        : undefined,
    })
  }

  if (loadingPrograms) {
    return <NewProjectPageSkeleton />
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex items-center gap-4">
        <Button variant="ghost" className="-ml-4" onClick={() => router.back()}>
          <ArrowLeft className="mr-2 h-4 w-4" />
          Back
        </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 & Stage selection */}
      <Card>
        <CardHeader>
          <CardTitle>Program & Stage</CardTitle>
          <CardDescription>
            Select the program for this project. Stage 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 stage 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>Stage (optional)</Label>
                <Select value={selectedRoundId || '__none__'} onValueChange={(v) => setSelectedRoundId(v === '__none__' ? '' : v)} disabled={!selectedProgramId}>
                  <SelectTrigger>
                    <SelectValue placeholder="No stage assigned" />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="__none__">No stage assigned</SelectItem>
                    {stages.map((s) => (
                      <SelectItem key={s.id} value={s.id}>
                        {s.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>

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

            {/* Team Members */}
            <Card>
              <CardHeader>
                <div className="flex items-center justify-between">
                  <CardTitle>Team Members</CardTitle>
                  <Badge variant="secondary">{teamMembers.length} / 10</Badge>
                </div>
                <CardDescription>
                  Add team members and optionally invite them to the platform
                </CardDescription>
              </CardHeader>
              <CardContent className="space-y-4">
                {teamMembers.length === 0 ? (
                  <div className="flex flex-col items-center justify-center rounded-lg border border-dashed py-8 text-center">
                    <Users className="h-10 w-10 text-muted-foreground/40" />
                    <p className="mt-2 text-sm font-medium">No team members yet</p>
                    <p className="text-xs text-muted-foreground">
                      Add members below to link them to this project
                    </p>
                  </div>
                ) : (
                  <div className="space-y-2">
                    {sortedMembers.map((member) => (
                      <div
                        key={member.id}
                        className="flex items-center gap-3 rounded-lg border p-3"
                      >
                        <Avatar className={`h-9 w-9 ${ROLE_AVATAR_COLORS[member.role]}`}>
                          <AvatarFallback className={ROLE_AVATAR_COLORS[member.role]}>
                            {getInitials(member.name)}
                          </AvatarFallback>
                        </Avatar>
                        <div className="min-w-0 flex-1">
                          <div className="flex items-center gap-2">
                            <span className="truncate text-sm font-medium">{member.name}</span>
                            <Badge variant="outline" className={`text-[10px] px-1.5 py-0 ${ROLE_COLORS[member.role]}`}>
                              {ROLE_LABELS[member.role]}
                            </Badge>
                            {member.title && (
                              <span className="hidden truncate text-xs text-muted-foreground sm:inline">
                                {member.title}
                              </span>
                            )}
                          </div>
                          <p className="truncate text-xs text-muted-foreground">{member.email}</p>
                        </div>
                        <div className="flex items-center gap-2">
                          <button
                            type="button"
                            onClick={() => handleToggleInvite(member.id)}
                            className={`flex items-center gap-1 rounded-md px-2 py-1 text-xs transition-colors ${
                              member.sendInvite
                                ? 'bg-primary/10 text-primary'
                                : 'text-muted-foreground hover:text-foreground'
                            }`}
                            title={member.sendInvite ? 'Invitation will be sent' : 'Click to send invitation'}
                          >
                            <Mail className="h-3.5 w-3.5" />
                            <span className="hidden sm:inline">
                              {member.sendInvite ? 'Invite' : 'No invite'}
                            </span>
                          </button>
                          <Button
                            type="button"
                            variant="ghost"
                            size="icon"
                            className="h-8 w-8 text-muted-foreground hover:text-destructive"
                            onClick={() => handleRemoveMember(member.id)}
                          >
                            <Trash2 className="h-4 w-4" />
                          </Button>
                        </div>
                      </div>
                    ))}
                  </div>
                )}

                {teamMembers.length > 0 && teamMembers.length < 10 && <Separator />}

                {/* Add member form */}
                {teamMembers.length < 10 && (
                  <div className="space-y-3">
                    <p className="text-sm font-medium flex items-center gap-1.5">
                      <UserPlus className="h-4 w-4" />
                      Add Member
                    </p>
                    <div className="grid gap-3 sm:grid-cols-2">
                      <div className="space-y-1.5">
                        <Label htmlFor="memberName" className="text-xs">Name *</Label>
                        <Input
                          id="memberName"
                          value={memberName}
                          onChange={(e) => setMemberName(e.target.value)}
                          placeholder="Full name"
                          className="h-9"
                        />
                      </div>
                      <div className="space-y-1.5">
                        <Label htmlFor="memberEmail" className="text-xs">Email *</Label>
                        <Input
                          id="memberEmail"
                          type="email"
                          value={memberEmail}
                          onChange={(e) => setMemberEmail(e.target.value)}
                          placeholder="email@example.com"
                          className="h-9"
                        />
                      </div>
                    </div>
                    <div className="grid gap-3 sm:grid-cols-2">
                      <div className="space-y-1.5">
                        <Label className="text-xs">Role</Label>
                        <Select value={memberRole} onValueChange={(v) => setMemberRole(v as 'LEAD' | 'MEMBER' | 'ADVISOR')}>
                          <SelectTrigger className="h-9">
                            <SelectValue />
                          </SelectTrigger>
                          <SelectContent>
                            <SelectItem value="LEAD">Lead</SelectItem>
                            <SelectItem value="MEMBER">Member</SelectItem>
                            <SelectItem value="ADVISOR">Advisor</SelectItem>
                          </SelectContent>
                        </Select>
                      </div>
                      <div className="space-y-1.5">
                        <Label htmlFor="memberTitle" className="text-xs">Title (optional)</Label>
                        <Input
                          id="memberTitle"
                          value={memberTitle}
                          onChange={(e) => setMemberTitle(e.target.value)}
                          placeholder="e.g., CEO, CTO"
                          className="h-9"
                        />
                      </div>
                    </div>
                    <div className="flex items-center justify-between">
                      <div className="flex items-center gap-2">
                        <Checkbox
                          id="memberSendInvite"
                          checked={memberSendInvite}
                          onCheckedChange={(checked) => setMemberSendInvite(checked === true)}
                        />
                        <Label htmlFor="memberSendInvite" className="text-xs cursor-pointer">
                          Send platform invitation
                        </Label>
                      </div>
                      <Button
                        type="button"
                        size="sm"
                        onClick={handleAddMember}
                      >
                        <UserPlus className="mr-1.5 h-3.5 w-3.5" />
                        Add
                      </Button>
                    </div>
                  </div>
                )}

                {teamMembers.length >= 10 && (
                  <p className="text-center text-xs text-muted-foreground">
                    Maximum of 10 team members reached
                  </p>
                )}
              </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>
  )
}
