'use client';

import { use, useState } from 'react';
import Link from 'next/link';
import { useRouter } from 'next/navigation';
import {
  ArrowLeft,
  Edit,
  Trash2,
  FolderKanban,
  Calendar,
  Loader2,
  ListTodo,
} from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { Skeleton } from '@/components/ui/skeleton';
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from '@/components/ui/alert-dialog';
import { useProject, useDeleteProject } from '@/lib/hooks/use-projects';
import { useEpics } from '@/lib/hooks/use-epics';
import { ProjectForm } from '@/components/projects/project-form';
import { formatDistanceToNow, format } from 'date-fns';
import { toast } from 'sonner';

interface ProjectDetailPageProps {
  params: Promise<{ id: string }>;
}

export default function ProjectDetailPage({ params }: ProjectDetailPageProps) {
  const { id } = use(params);
  const router = useRouter();
  const [isEditDialogOpen, setIsEditDialogOpen] = useState(false);
  const [isDeleteDialogOpen, setIsDeleteDialogOpen] = useState(false);

  const { data: project, isLoading, error } = useProject(id);
  const { data: epics, isLoading: epicsLoading } = useEpics(id);
  const deleteProject = useDeleteProject();

  const handleDelete = async () => {
    try {
      await deleteProject.mutateAsync(id);
      toast.success('Project deleted successfully');
      router.push('/projects');
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Failed to delete project';
      toast.error(message);
    }
  };

  if (isLoading) {
    return (
      <div className="space-y-6">
        <Skeleton className="h-10 w-24" />
        <div className="flex items-start justify-between">
          <div className="space-y-2 flex-1">
            <Skeleton className="h-10 w-64" />
            <Skeleton className="h-6 w-32" />
          </div>
          <div className="flex gap-2">
            <Skeleton className="h-10 w-24" />
            <Skeleton className="h-10 w-24" />
          </div>
        </div>
        <div className="grid gap-6 md:grid-cols-3">
          <div className="md:col-span-2">
            <Card>
              <CardHeader>
                <Skeleton className="h-6 w-32" />
              </CardHeader>
              <CardContent>
                <Skeleton className="h-24 w-full" />
              </CardContent>
            </Card>
          </div>
          <Card>
            <CardHeader>
              <Skeleton className="h-6 w-24" />
            </CardHeader>
            <CardContent className="space-y-4">
              <Skeleton className="h-16 w-full" />
              <Skeleton className="h-16 w-full" />
            </CardContent>
          </Card>
        </div>
      </div>
    );
  }

  if (error || !project) {
    return (
      <div className="flex items-center justify-center min-h-[400px]">
        <Card className="w-full max-w-md">
          <CardHeader>
            <CardTitle className="text-destructive">Error Loading Project</CardTitle>
            <CardDescription>
              {error instanceof Error ? error.message : 'Project not found'}
            </CardDescription>
          </CardHeader>
          <CardContent className="flex gap-2">
            <Button onClick={() => router.back()}>Go Back</Button>
            <Button onClick={() => window.location.reload()} variant="outline">
              Retry
            </Button>
          </CardContent>
        </Card>
      </div>
    );
  }

  return (
    <div className="space-y-6">
      {/* Breadcrumb / Back button */}
      <Button variant="ghost" asChild>
        <Link href="/projects">
          <ArrowLeft className="mr-2 h-4 w-4" />
          Back to Projects
        </Link>
      </Button>

      {/* Header */}
      <div className="flex items-start justify-between">
        <div className="space-y-2">
          <div className="flex items-center gap-3">
            <h1 className="text-3xl font-bold tracking-tight">{project.name}</h1>
            <Badge variant="secondary" className="text-sm">
              {project.key}
            </Badge>
          </div>
          <div className="flex items-center text-sm text-muted-foreground">
            <Calendar className="mr-1 h-4 w-4" />
            Created {formatDistanceToNow(new Date(project.createdAt), { addSuffix: true })}
          </div>
        </div>
        <div className="flex gap-2">
          <Button variant="outline" onClick={() => setIsEditDialogOpen(true)}>
            <Edit className="mr-2 h-4 w-4" />
            Edit
          </Button>
          <Button
            variant="destructive"
            onClick={() => setIsDeleteDialogOpen(true)}
            disabled={deleteProject.isPending}
          >
            {deleteProject.isPending ? (
              <Loader2 className="mr-2 h-4 w-4 animate-spin" />
            ) : (
              <Trash2 className="mr-2 h-4 w-4" />
            )}
            Delete
          </Button>
        </div>
      </div>

      {/* Content */}
      <div className="grid gap-6 md:grid-cols-3">
        {/* Main content */}
        <div className="md:col-span-2 space-y-6">
          {/* Project details */}
          <Card>
            <CardHeader>
              <CardTitle>Project Details</CardTitle>
            </CardHeader>
            <CardContent className="space-y-4">
              <div>
                <h3 className="text-sm font-medium mb-1">Description</h3>
                {project.description ? (
                  <p className="text-sm text-muted-foreground">{project.description}</p>
                ) : (
                  <p className="text-sm text-muted-foreground italic">No description provided</p>
                )}
              </div>
              <div className="grid grid-cols-2 gap-4 pt-4 border-t">
                <div>
                  <h3 className="text-sm font-medium mb-1">Created</h3>
                  <p className="text-sm text-muted-foreground">
                    {format(new Date(project.createdAt), 'PPP')}
                  </p>
                </div>
                <div>
                  <h3 className="text-sm font-medium mb-1">Last Updated</h3>
                  <p className="text-sm text-muted-foreground">
                    {format(new Date(project.updatedAt), 'PPP')}
                  </p>
                </div>
              </div>
            </CardContent>
          </Card>

          {/* Epics preview */}
          <Card>
            <CardHeader>
              <div className="flex items-center justify-between">
                <CardTitle>Epics</CardTitle>
                <Button variant="outline" size="sm" asChild>
                  <Link href={`/projects/${project.id}/epics`}>View All</Link>
                </Button>
              </div>
              <CardDescription>
                Track major features and initiatives in this project
              </CardDescription>
            </CardHeader>
            <CardContent>
              {epicsLoading ? (
                <div className="space-y-3">
                  {Array.from({ length: 3 }).map((_, i) => (
                    <Skeleton key={i} className="h-16 w-full" />
                  ))}
                </div>
              ) : epics && epics.length > 0 ? (
                <div className="space-y-2">
                  {epics.slice(0, 5).map((epic) => (
                    <Link
                      key={epic.id}
                      href={`/epics/${epic.id}`}
                      className="block p-3 rounded-lg border hover:bg-accent transition-colors"
                    >
                      <div className="flex items-start justify-between">
                        <div className="space-y-1 flex-1">
                          <p className="text-sm font-medium line-clamp-1">{epic.name}</p>
                          <div className="flex items-center gap-2">
                            <Badge variant="outline" className="text-xs">
                              {epic.status}
                            </Badge>
                            <Badge variant="outline" className="text-xs">
                              {epic.priority}
                            </Badge>
                          </div>
                        </div>
                      </div>
                    </Link>
                  ))}
                  {epics.length > 5 && (
                    <p className="text-xs text-muted-foreground text-center pt-2">
                      And {epics.length - 5} more...
                    </p>
                  )}
                </div>
              ) : (
                <div className="text-center py-8">
                  <ListTodo className="h-8 w-8 text-muted-foreground mx-auto mb-2" />
                  <p className="text-sm text-muted-foreground">No epics yet</p>
                  <Button variant="outline" size="sm" className="mt-4" asChild>
                    <Link href={`/projects/${project.id}/epics`}>Create First Epic</Link>
                  </Button>
                </div>
              )}
            </CardContent>
          </Card>
        </div>

        {/* Sidebar */}
        <div className="space-y-6">
          {/* Quick actions */}
          <Card>
            <CardHeader>
              <CardTitle>Quick Actions</CardTitle>
            </CardHeader>
            <CardContent className="space-y-2">
              <Button variant="outline" className="w-full justify-start" asChild>
                <Link href={`/projects/${project.id}/kanban`}>
                  <FolderKanban className="mr-2 h-4 w-4" />
                  View Kanban Board
                </Link>
              </Button>
              <Button variant="outline" className="w-full justify-start" asChild>
                <Link href={`/projects/${project.id}/epics`}>
                  <ListTodo className="mr-2 h-4 w-4" />
                  Manage Epics
                </Link>
              </Button>
            </CardContent>
          </Card>

          {/* Project stats */}
          <Card>
            <CardHeader>
              <CardTitle>Statistics</CardTitle>
            </CardHeader>
            <CardContent className="space-y-4">
              <div className="flex items-center justify-between">
                <span className="text-sm text-muted-foreground">Total Epics</span>
                <span className="text-2xl font-bold">{epics?.length || 0}</span>
              </div>
              <div className="flex items-center justify-between">
                <span className="text-sm text-muted-foreground">Active</span>
                <span className="text-lg font-semibold">
                  {epics?.filter((e) => e.status === 'InProgress').length || 0}
                </span>
              </div>
              <div className="flex items-center justify-between">
                <span className="text-sm text-muted-foreground">Completed</span>
                <span className="text-lg font-semibold">
                  {epics?.filter((e) => e.status === 'Done').length || 0}
                </span>
              </div>
            </CardContent>
          </Card>
        </div>
      </div>

      {/* Edit Project Dialog */}
      <Dialog open={isEditDialogOpen} onOpenChange={setIsEditDialogOpen}>
        <DialogContent className="max-w-2xl">
          <DialogHeader>
            <DialogTitle>Edit Project</DialogTitle>
            <DialogDescription>
              Update your project details
            </DialogDescription>
          </DialogHeader>
          <ProjectForm
            project={project}
            onSuccess={() => setIsEditDialogOpen(false)}
            onCancel={() => setIsEditDialogOpen(false)}
          />
        </DialogContent>
      </Dialog>

      {/* Delete Confirmation Dialog */}
      <AlertDialog open={isDeleteDialogOpen} onOpenChange={setIsDeleteDialogOpen}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>Are you sure?</AlertDialogTitle>
            <AlertDialogDescription>
              This action cannot be undone. This will permanently delete the project
              <span className="font-semibold"> {project.name}</span> and all its associated data
              (epics, stories, and tasks).
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>Cancel</AlertDialogCancel>
            <AlertDialogAction
              onClick={handleDelete}
              className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
            >
              Delete Project
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </div>
  );
}