"use client"

import { useState, useEffect } from 'react'
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
import { Button } from '@/components/ui/button'
import { Badge } from '@/components/ui/badge'
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import { Textarea } from '@/components/ui/textarea'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
import { 
  CheckCircle, 
  XCircle, 
  Clock,
  RefreshCw,
  AlertCircle,
  Copy,
  Filter,
  Search,
  Edit,
  Plus,
  Save,
  Files,
  Settings,
  ChevronLeft,
  ChevronRight
} from 'lucide-react'
import { adminApi, formatDate, getStatusColor, getComplexityColor } from '@/lib/api/admin'
import { AdminTemplate, AdminStats } from '@/types/admin.types'
import { TemplateEditDialog } from './template-edit-dialog'
import { RejectDialog } from './reject-dialog'
import { TemplateFeaturesManager } from './template-features-manager'
import { AdminTemplatesList } from './admin-templates-list'
import { useAdminNotifications } from '@/contexts/AdminNotificationContext'

export function AdminTemplatesManager() {
  const [activeTab, setActiveTab] = useState("admin-templates")
  const [customTemplates, setCustomTemplates] = useState<AdminTemplate[]>([])
  const [_templateStats, setTemplateStats] = useState<AdminStats | null>(null)
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState<string | null>(null)
  const [selectedTemplate, setSelectedTemplate] = useState<AdminTemplate | null>(null)
  const [showTemplateEditDialog, setShowTemplateEditDialog] = useState(false)
  const [showRejectDialog, setShowRejectDialog] = useState(false)
  const [rejectItem, setRejectItem] = useState<{ id: string; name: string; type: 'template' } | null>(null)
  const [searchQuery, setSearchQuery] = useState('')
  const [statusFilter, setStatusFilter] = useState<string>('all')
  const [showFeaturesManager, setShowFeaturesManager] = useState(false)
  const [selectedTemplateForFeatures, setSelectedTemplateForFeatures] = useState<AdminTemplate | null>(null)
  // Pagination state
  const [page, setPage] = useState(1)
  const [limit, setLimit] = useState(6)
  const [hasMore, setHasMore] = useState(false)
  
  // Create template form state
  const [newTemplate, setNewTemplate] = useState({
    title: '',
    description: '',
    category: '',
    type: '',
    complexity: 'low',
    icon: '',
    gradient: '',
    border: '',
    text: '',
    subtext: ''
  })
  
  const { removeByReference } = useAdminNotifications()

  // Load templates data
  const loadTemplatesData = async () => {
    try {
      setLoading(true)
      setError(null)

      console.log('Loading templates data...')
      
      const offset = (page - 1) * limit
      const effectiveStatus = statusFilter === 'all' ? undefined : statusFilter
      const [templatesResponse, templateStatsResponse] = await Promise.all([
        adminApi.getCustomTemplates(effectiveStatus, limit, offset),
        adminApi.getTemplateStats()
      ])

      console.log('Templates response:', templatesResponse)
      console.log('Template stats response:', templateStatsResponse)

      setCustomTemplates(templatesResponse || [])
      setHasMore((templatesResponse || []).length === limit)
      setTemplateStats(templateStatsResponse)
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load templates data')
      console.error('Error loading templates data:', err)
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    loadTemplatesData()
  }, [page, statusFilter])

  // Handle template review
  const handleTemplateReview = async (templateId: string, reviewData: { status: 'pending' | 'approved' | 'rejected' | 'duplicate'; admin_notes?: string }) => {
    try {
      await adminApi.reviewTemplate(templateId, reviewData)
      
      // Update the template in the list
      setCustomTemplates(prev => prev.map(t => 
        t.id === templateId ? { ...t, status: reviewData.status as AdminTemplate['status'], admin_notes: reviewData.admin_notes } : t
      ))
      
      // Reload stats
      const newStats = await adminApi.getTemplateStats()
      setTemplateStats(newStats)
      
    } catch (err) {
      console.error('Error reviewing template:', err)
      alert('Error reviewing template')
    }
  }

  // Handle template update
  const handleTemplateUpdate = (templateId: string, updatedTemplate: AdminTemplate) => {
    setCustomTemplates(prev => prev.filter(t => t.id !== templateId))
  }

  // Handle reject action
  const handleReject = async (adminNotes: string) => {
    if (!rejectItem) return

    try {
      await adminApi.rejectTemplate(rejectItem.id, adminNotes)
      setCustomTemplates(prev => prev.map(t => 
        t.id === rejectItem.id ? { ...t, status: 'rejected', admin_notes: adminNotes } : t
      ))
      // Reload template stats
      const newStats = await adminApi.getTemplateStats()
      setTemplateStats(newStats)
    } catch (err) {
      console.error('Error rejecting template:', err)
      alert('Error rejecting template')
    }
  }

  // Handle approve action
  const handleApprove = async (templateId: string) => {
    // Optimistic UI: remove immediately
    setCustomTemplates(prev => prev.filter(t => t.id !== templateId))
    
    try {
      // Get the template details first
      const template = customTemplates.find(t => t.id === templateId)
      if (template) {
        // Create new approved template in main templates table
        await adminApi.createApprovedTemplate(templateId, {
          title: template.title || '',
          description: template.description,
          category: template.category || '',
          type: template.type || '',
          icon: template.icon,
          gradient: template.gradient,
          border: template.border,
          text: template.text,
          subtext: template.subtext
        })
        
        // Update the custom template status to approved
        await adminApi.reviewTemplate(templateId, { status: 'approved', admin_notes: 'Approved and created in main templates' })
        
        // Remove related notifications for this template
        removeByReference('custom_template', templateId)
      }
      
      // Reload template stats
      const newStats = await adminApi.getTemplateStats()
      setTemplateStats(newStats)
    } catch (err) {
      console.error('Error approving template:', err)
      // Recover UI by reloading if optimistic removal was wrong
      await loadTemplatesData()
    }
  }

  // Handle create template
  const handleCreateTemplate = async (e: React.FormEvent) => {
    e.preventDefault()
    
    try {
      // Validate required fields
      if (!newTemplate.title || !newTemplate.description || !newTemplate.category || !newTemplate.type) {
        alert('Please fill in all required fields (Title, Description, Category, Type)')
        return
      }

      // Call API to create new custom template using the correct endpoint
      await adminApi.createCustomTemplate({
        title: newTemplate.title,
        description: newTemplate.description,
        category: newTemplate.category,
        type: newTemplate.type,
        complexity: newTemplate.complexity,
        icon: newTemplate.icon,
        gradient: newTemplate.gradient,
        border: newTemplate.border,
        text: newTemplate.text,
        subtext: newTemplate.subtext
      })
      
      // Reset form
      setNewTemplate({
        title: '',
        description: '',
        category: '',
        type: '',
        complexity: 'low',
        icon: '',
        gradient: '',
        border: '',
        text: '',
        subtext: ''
      })
      
      // Reload templates
      await loadTemplatesData()
      
      // Switch to manage tab
      setActiveTab("manage")
      
      alert('Template created successfully!')
    } catch (err) {
      console.error('Error creating template:', err)
      const errorMessage = err instanceof Error ? err.message : 'Failed to create template'
      alert(`Error creating template: ${errorMessage}`)
    }
  }

  // Filter templates based on search and status
  const filteredTemplates = customTemplates.filter(template => {
    const matchesSearch = template.title?.toLowerCase().includes(searchQuery.toLowerCase()) ||
                         template.description?.toLowerCase().includes(searchQuery.toLowerCase()) ||
                         template.category?.toLowerCase().includes(searchQuery.toLowerCase())
    
    const matchesStatus = statusFilter === 'all' || template.status === statusFilter
    
    return matchesSearch && matchesStatus
  })

  // Get status counts for CUSTOM templates only (computed on client)
  const getCustomStatusCount = (status: 'pending' | 'approved' | 'rejected' | 'duplicate') => {
    return customTemplates.filter((t) => t.status === status).length
  }

  if (loading) {
    return (
      <div className="flex items-center justify-center min-h-[400px]">
        <div className="flex items-center space-x-2">
          <RefreshCw className="h-6 w-6 animate-spin" />
          <span>Loading templates...</span>
        </div>
      </div>
    )
  }

  if (error) {
    return (
      <div className="flex items-center justify-center min-h-[400px]">
        <Card className="w-full max-w-md">
          <CardContent className="pt-6">
            <div className="flex items-center space-x-2 text-red-600">
              <AlertCircle className="h-6 w-6" />
              <span>Error loading templates</span>
            </div>
            <p className="mt-2 text-sm text-gray-600">{error}</p>
            <Button onClick={loadTemplatesData} className="mt-4">
              <RefreshCw className="h-4 w-4 mr-2" />
              Retry
            </Button>
          </CardContent>
        </Card>
      </div>
    )
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      {/* <div className="flex items-center justify-between">
        <div>
          <h1 className="text-3xl font-bold text-white">Templates Management</h1>
          <p className="text-white/70">Manage templates and create new ones</p>
        </div>
        <div className="flex items-center space-x-2">
          <Button onClick={loadTemplatesData} className="bg-orange-500 text-black hover:bg-orange-600">
            <RefreshCw className="h-4 w-4 mr-2" />
            Refresh
          </Button>
        </div>
      </div> */}

      {/* Stats Cards - only for Custom Templates tab */}
      {activeTab === 'manage' && (
        <div className="grid grid-cols-1 md:grid-cols-4 gap-6">
          <Card className="bg-gray-900 border-gray-800">
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium text-white">Total Templates</CardTitle>
              <Files className="h-4 w-4 text-white/60" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold text-white">{customTemplates.length}</div>
            </CardContent>
          </Card>

          <Card className="bg-gray-900 border-gray-800">
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium text-white">Pending</CardTitle>
              <Clock className="h-4 w-4 text-yellow-600" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold text-white">{getCustomStatusCount('pending')}</div>
            </CardContent>
          </Card>

          <Card className="bg-gray-900 border-gray-800">
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium text-white">Approved</CardTitle>
              <CheckCircle className="h-4 w-4 text-green-500" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold text-white">{getCustomStatusCount('approved')}</div>
            </CardContent>
          </Card>

          <Card className="bg-gray-900 border-gray-800">
            <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
              <CardTitle className="text-sm font-medium text-white">Rejected</CardTitle>
              <XCircle className="h-4 w-4 text-red-500" />
            </CardHeader>
            <CardContent>
              <div className="text-2xl font-bold text-white">{getCustomStatusCount('rejected')}</div>
            </CardContent>
          </Card>
        </div>
      )}

      {/* Main Content */}
      <Tabs value={activeTab} onValueChange={setActiveTab} className="space-y-4">
        <TabsList className="bg-gray-900 border-gray-800">
          <TabsTrigger value="admin-templates" className="flex items-center space-x-2 data-[state=active]:bg-orange-500 data-[state=active]:text-black text-white/70">
            <Settings className="h-4 w-4" />
            <span>Admin Templates</span>
          </TabsTrigger>
          <TabsTrigger value="manage" className="flex items-center space-x-2 data-[state=active]:bg-orange-500 data-[state=active]:text-black text-white/70">
            <Filter className="h-4 w-4" />
            <span>Custom Templates ({customTemplates.length})</span>
          </TabsTrigger>
        </TabsList>

        <TabsContent value="admin-templates" className="space-y-4">
          <AdminTemplatesList />
        </TabsContent>

        <TabsContent value="manage" className="space-y-4">
          {/* Filters */}
          <div className="flex items-center space-x-4">
            <div className="flex-1">
              <div className="relative">
                <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 h-4 w-4 text-gray-400" />
                <Input
                  placeholder="Search templates..."
                  value={searchQuery}
                  onChange={(e) => { setSearchQuery(e.target.value); setPage(1) }}
                  className="pl-10"
                />
              </div>
            </div>
            <Select value={statusFilter} onValueChange={(v) => { setStatusFilter(v); setPage(1) }}>
              <SelectTrigger className="w-48">
                <SelectValue placeholder="Filter by status" />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="all">All Status</SelectItem>
                <SelectItem value="pending">Pending</SelectItem>
                <SelectItem value="approved">Approved</SelectItem>
                <SelectItem value="rejected">Rejected</SelectItem>
                <SelectItem value="duplicate">Duplicate</SelectItem>
              </SelectContent>
            </Select>
          </div>

          {/* Templates List */}
          <div className="space-y-4">
            {filteredTemplates.length === 0 ? (
              <Card>
                <CardContent className="pt-6">
                  <div className="text-center text-gray-500">
                    <Copy className="h-12 w-12 mx-auto mb-4 text-gray-300" />
                    <p>No templates found</p>
                    <p className="text-sm">All templates have been reviewed or no templates match your filters.</p>
                  </div>
                </CardContent>
              </Card>
            ) : (
              filteredTemplates.map((template) => (
                <Card key={template.id} className="hover:shadow-md transition-shadow">
                  <CardContent className="pt-6">
                    <div className="flex items-start justify-between">
                      <div className="flex-1">
                        <div className="flex items-center space-x-2 mb-2">
                          <h3 className="text-lg font-semibold">{template.title}</h3>
                          <Badge className={getStatusColor(template.status)}>
                            {template.status}
                          </Badge>
                          <Badge className={getComplexityColor(template.complexity)}>
                            {template.complexity}
                          </Badge>
                          {template.category && (
                            <Badge variant="outline">{template.category}</Badge>
                          )}
                        </div>
                        
                        {template.description && (
                          <p className="text-gray-600 mb-2">{template.description}</p>
                        )}
                        
                        <div className="flex items-center space-x-4 text-sm text-gray-500">
                          <span>Type: {template.type || 'Unknown'}</span>
                          <span>Submitted: {formatDate(template.created_at)}</span>
                          <span>Usage: {template.usage_count || 0}</span>
                        </div>

                        {template.admin_notes && (
                          <div className="mt-2 p-2 bg-gray-50 rounded">
                            <p className="text-sm text-gray-600">
                              <strong>Admin Notes:</strong> {template.admin_notes}
                            </p>
                          </div>
                        )}
                      </div>
                      
                      <div className="flex items-center space-x-2">
                        <Button
                          variant="outline"
                          size="sm"
                          onClick={() => handleApprove(template.id)}
                          className="text-green-600 hover:text-green-700 hover:bg-green-50"
                        >
                          <CheckCircle className="h-4 w-4 mr-1" />
                          Approve
                        </Button>
                        <Button
                          variant="outline"
                          size="sm"
                          onClick={() => {
                            setRejectItem({ id: template.id, name: template.title, type: 'template' })
                            setShowRejectDialog(true)
                          }}
                          className="text-red-600 hover:text-red-700 hover:bg-red-50"
                        >
                          <XCircle className="h-4 w-4 mr-1" />
                          Reject
                        </Button>
                        <Button
                          variant="outline"
                          size="sm"
                          onClick={() => {
                            setSelectedTemplateForFeatures(template)
                            setShowFeaturesManager(true)
                          }}
                          className="text-green-600 hover:text-green-700 hover:bg-green-50"
                        >
                          <Settings className="h-4 w-4 mr-1" />
                          Features
                        </Button>
                        <Button
                          variant="outline"
                          size="sm"
                          onClick={() => {
                            setSelectedTemplate(template)
                            setShowTemplateEditDialog(true)
                          }}
                          className="text-blue-600 hover:text-blue-700 hover:bg-blue-50"
                        >
                          <Edit className="h-4 w-4 mr-1" />
                          Edit
                        </Button>
                      </div>
                    </div>
                  </CardContent>
                </Card>
              ))
            )}
            {/* Pagination Controls */}
            <div className="flex items-center justify-between pt-2">
              <div className="text-sm text-gray-500">Page {page}</div>
              <div className="space-x-2">
                <Button
                  variant="outline"
                  size="sm"
                  disabled={page === 1}
                  onClick={() => setPage((p) => Math.max(1, p - 1))}
                >
                  <span className="flex items-center"><ChevronLeft className="h-4 w-4 mr-1" /> Prev</span>
                </Button>
                <Button
                  variant="outline"
                  size="sm"
                  disabled={!hasMore}
                  onClick={() => setPage((p) => p + 1)}
                >
                  <span className="flex items-center">Next <ChevronRight className="h-4 w-4 ml-1" /></span>
                </Button>
              </div>
            </div>
          </div>
        </TabsContent>

        <TabsContent value="create" className="space-y-4">
          <Card className="bg-gray-900 border-gray-800">
            <CardHeader>
              <CardTitle className="text-white">Create New Template</CardTitle>
            </CardHeader>
            <CardContent>
              <form onSubmit={handleCreateTemplate} className="space-y-4">
                <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div className="space-y-2">
                    <Label htmlFor="title" className="text-white">Template Title</Label>
                    <Input
                      id="title"
                      value={newTemplate.title}
                      onChange={(e) => setNewTemplate(prev => ({ ...prev, title: e.target.value }))}
                      className="bg-white/5 border-white/10 text-white"
                      placeholder="Enter template title"
                      required
                    />
                  </div>
                  
                  <div className="space-y-2">
                    <Label htmlFor="category" className="text-white">Category</Label>
                    <Select value={newTemplate.category} onValueChange={(value) => setNewTemplate(prev => ({ ...prev, category: value }))}>
                      <SelectTrigger className="bg-white/5 border-white/10 text-white">
                        <SelectValue placeholder="Select category" />
                      </SelectTrigger>
                      <SelectContent>
                        <SelectItem value="marketing">Marketing</SelectItem>
                        <SelectItem value="software">Software</SelectItem>
                        <SelectItem value="seo">SEO</SelectItem>
                        <SelectItem value="ecommerce">E-commerce</SelectItem>
                        <SelectItem value="portfolio">Portfolio</SelectItem>
                      </SelectContent>
                    </Select>
                  </div>
                </div>

                <div className="space-y-2">
                  <Label htmlFor="description" className="text-white">Description</Label>
                  <Textarea
                    id="description"
                    value={newTemplate.description}
                    onChange={(e) => setNewTemplate(prev => ({ ...prev, description: e.target.value }))}
                    className="bg-white/5 border-white/10 text-white"
                    placeholder="Enter template description"
                    rows={3}
                    required
                  />
                </div>

                <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div className="space-y-2">
                    <Label htmlFor="type" className="text-white">Type</Label>
                    <Select value={newTemplate.type} onValueChange={(value) => setNewTemplate(prev => ({ ...prev, type: value }))}>
                      <SelectTrigger className="bg-white/5 border-white/10 text-white">
                        <SelectValue placeholder="Select template type" />
                      </SelectTrigger>
                      <SelectContent>
                        <SelectItem value="Business Website">Business Website</SelectItem>
                        <SelectItem value="E-commerce Store">E-commerce Store</SelectItem>
                        <SelectItem value="Landing Page">Landing Page</SelectItem>
                        <SelectItem value="Blog Platform">Blog Platform</SelectItem>
                        <SelectItem value="Portfolio Site">Portfolio Site</SelectItem>
                        <SelectItem value="SaaS Platform">SaaS Platform</SelectItem>
                        <SelectItem value="Mobile App">Mobile App</SelectItem>
                        <SelectItem value="Web Application">Web Application</SelectItem>
                        <SelectItem value="Marketing Site">Marketing Site</SelectItem>
                        <SelectItem value="Corporate Website">Corporate Website</SelectItem>
                        <SelectItem value="Educational Platform">Educational Platform</SelectItem>
                        <SelectItem value="Social Media App">Social Media App</SelectItem>
                      </SelectContent>
                    </Select>
                  </div>
                  
                  <div className="space-y-2">
                    <Label htmlFor="complexity" className="text-white">Complexity</Label>
                    <Select value={newTemplate.complexity} onValueChange={(value) => setNewTemplate(prev => ({ ...prev, complexity: value }))}>
                      <SelectTrigger className="bg-white/5 border-white/10 text-white">
                        <SelectValue placeholder="Select complexity" />
                      </SelectTrigger>
                      <SelectContent>
                        <SelectItem value="low">Low</SelectItem>
                        <SelectItem value="medium">Medium</SelectItem>
                        <SelectItem value="high">High</SelectItem>
                      </SelectContent>
                    </Select>
                  </div>
                </div>

                <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div className="space-y-2">
                    <Label htmlFor="icon" className="text-white">Icon</Label>
                    <Input
                      id="icon"
                      value={newTemplate.icon}
                      onChange={(e) => setNewTemplate(prev => ({ ...prev, icon: e.target.value }))}
                      className="bg-white/5 border-white/10 text-white"
                      placeholder="Icon name or URL"
                    />
                  </div>
                  
                  <div className="space-y-2">
                    <Label htmlFor="gradient" className="text-white">Gradient</Label>
                    <Input
                      id="gradient"
                      value={newTemplate.gradient}
                      onChange={(e) => setNewTemplate(prev => ({ ...prev, gradient: e.target.value }))}
                      className="bg-white/5 border-white/10 text-white"
                      placeholder="CSS gradient value"
                    />
                  </div>
                </div>

                <div className="flex justify-end space-x-2">
                  <Button type="button" variant="outline" onClick={() => setActiveTab("manage")}>
                    Cancel
                  </Button>
                  <Button type="submit" className="bg-orange-500 text-black hover:bg-orange-600">
                    <Save className="h-4 w-4 mr-2" />
                    Create Template
                  </Button>
                </div>
              </form>
            </CardContent>
          </Card>
        </TabsContent>
      </Tabs>

      {/* Template Edit Dialog */}
      {selectedTemplate && (
        <TemplateEditDialog
          template={selectedTemplate}
          open={showTemplateEditDialog}
          onOpenChange={setShowTemplateEditDialog}
          onUpdate={handleTemplateUpdate}
        />
      )}

      {/* Reject Dialog */}
      {rejectItem && (
        <RejectDialog
          open={showRejectDialog}
          onOpenChange={setShowRejectDialog}
          onReject={handleReject}
          title="Reject Template"
          itemName={rejectItem.name}
          itemType={rejectItem.type}
        />
      )}

      {/* Template Features Manager */}
      {selectedTemplateForFeatures && (
        <TemplateFeaturesManager
          template={selectedTemplateForFeatures}
          open={showFeaturesManager}
          onOpenChange={setShowFeaturesManager}
        />
      )}
    </div>
  )
}
