import { useState, useEffect } from "react";
import { useAuth } from "@/hooks/useAuth";
import { supabase } from "@/integrations/supabase/client";
import { UserTopList, UserTopListItem } from "@/types/database";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
import { Plus, Trash2, Edit, Eye, EyeOff } from "lucide-react";
import { toast } from "sonner";
import { ListItemEditor } from "./ListItemEditor";
import { ListDisplay } from "./ListDisplay";
import { handleError } from "@/lib/errorHandler";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog";
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 { Switch } from "@/components/ui/switch";

export function UserListManager() {
  const { user } = useAuth();
  const [lists, setLists] = useState<UserTopList[]>([]);
  const [loading, setLoading] = useState(true);
  const [editingList, setEditingList] = useState<UserTopList | null>(null);
  const [isCreateDialogOpen, setIsCreateDialogOpen] = useState(false);
  
  const [newListTitle, setNewListTitle] = useState("");
  const [newListDescription, setNewListDescription] = useState("");
  const [newListType, setNewListType] = useState<string>("mixed");
  const [newListIsPublic, setNewListIsPublic] = useState(true);

  useEffect(() => {
    if (user) {
      fetchLists();
    }
  }, [user]);

  const fetchLists = async () => {
    if (!user) return;

    setLoading(true);
    const { data, error } = await supabase
      .from("user_top_lists")
      .select(`
        *,
        list_items (
          id,
          entity_type,
          entity_id,
          position,
          notes,
          created_at,
          updated_at
        )
      `)
      .eq("user_id", user.id)
      .order("created_at", { ascending: false });

    if (error) {
      handleError(error, {
        action: 'Load User Lists',
        userId: user.id
      });
    } else {
      // Map Supabase data to UserTopList interface
      const mappedLists: UserTopList[] = (data || []).map(list => ({
        id: list.id,
        user_id: list.user_id,
        title: list.title,
        description: list.description,
        list_type: list.list_type as 'parks' | 'rides' | 'coasters' | 'companies' | 'mixed',
        is_public: list.is_public,
        created_at: list.created_at,
        updated_at: list.updated_at,
        items: (list.list_items || []).map(item => ({
          id: item.id,
          list_id: list.id, // Add the parent list ID
          entity_type: item.entity_type as 'park' | 'ride' | 'company',
          entity_id: item.entity_id,
          position: item.position,
          notes: item.notes,
          created_at: item.created_at || new Date().toISOString(),
          updated_at: item.updated_at || new Date().toISOString(),
        })),
      }));
      setLists(mappedLists);
    }
    setLoading(false);
  };

  const handleCreateList = async () => {
    if (!user || !newListTitle.trim()) {
      toast.error("Please enter a list title");
      return;
    }

    const { data, error } = await supabase
      .from("user_top_lists")
      .insert([{
        user_id: user.id,
        title: newListTitle,
        description: newListDescription || null,
        list_type: newListType,
        is_public: newListIsPublic,
      }])
      .select()
      .single();

    if (error) {
      handleError(error, {
        action: 'Create List',
        userId: user.id,
        metadata: { title: newListTitle }
      });
    } else {
      toast.success("List created successfully");
      const newList: UserTopList = {
        id: data.id,
        user_id: data.user_id,
        title: data.title,
        description: data.description,
        list_type: data.list_type as 'parks' | 'rides' | 'coasters' | 'companies' | 'mixed',
        is_public: data.is_public,
        created_at: data.created_at,
        updated_at: data.updated_at,
        items: [],
      };
      setLists([newList, ...lists]);
      setIsCreateDialogOpen(false);
      setNewListTitle("");
      setNewListDescription("");
      setNewListType("mixed");
      setNewListIsPublic(true);
    }
  };

  const handleDeleteList = async (listId: string) => {
    const { error } = await supabase
      .from("user_top_lists")
      .delete()
      .eq("id", listId);

    if (error) {
      handleError(error, {
        action: 'Delete List',
        userId: user?.id,
        metadata: { listId }
      });
    } else {
      toast.success("List deleted");
      setLists(lists.filter(l => l.id !== listId));
    }
  };

  const handleToggleVisibility = async (list: UserTopList) => {
    const { error } = await supabase
      .from("user_top_lists")
      .update({ is_public: !list.is_public })
      .eq("id", list.id);

    if (error) {
      handleError(error, {
        action: 'Toggle List Visibility',
        userId: user?.id,
        metadata: { listId: list.id }
      });
    } else {
      toast.success(`List is now ${!list.is_public ? "public" : "private"}`);
      setLists(lists.map(l => 
        l.id === list.id ? { ...l, is_public: !l.is_public } : l
      ));
    }
  };

  if (loading) {
    return <div className="text-center py-8">Loading lists...</div>;
  }

  return (
    <div className="space-y-6">
      <div className="flex justify-between items-center">
        <h2 className="text-2xl font-bold">My Lists</h2>
        <Dialog open={isCreateDialogOpen} onOpenChange={setIsCreateDialogOpen}>
          <DialogTrigger asChild>
            <Button>
              <Plus className="h-4 w-4 mr-2" />
              Create List
            </Button>
          </DialogTrigger>
          <DialogContent>
            <DialogHeader>
              <DialogTitle>Create New List</DialogTitle>
              <DialogDescription>
                Create a new list to organize your favorite parks, rides, or companies.
              </DialogDescription>
            </DialogHeader>
            <div className="space-y-4">
              <div>
                <Label htmlFor="title">Title</Label>
                <Input
                  id="title"
                  value={newListTitle}
                  onChange={(e) => setNewListTitle(e.target.value)}
                  placeholder="My Top 10 Coasters"
                />
              </div>
              <div>
                <Label htmlFor="description">Description (optional)</Label>
                <Textarea
                  id="description"
                  value={newListDescription}
                  onChange={(e) => setNewListDescription(e.target.value)}
                  placeholder="A list of my all-time favorite roller coasters"
                />
              </div>
              <div>
                <Label htmlFor="type">List Type</Label>
                <Select value={newListType} onValueChange={setNewListType}>
                  <SelectTrigger>
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent>
                    <SelectItem value="parks">Parks</SelectItem>
                    <SelectItem value="rides">Rides</SelectItem>
                    <SelectItem value="coasters">Coasters</SelectItem>
                    <SelectItem value="companies">Companies</SelectItem>
                    <SelectItem value="mixed">Mixed</SelectItem>
                  </SelectContent>
                </Select>
              </div>
              <div className="flex items-center space-x-2">
                <Switch
                  id="public"
                  checked={newListIsPublic}
                  onCheckedChange={setNewListIsPublic}
                />
                <Label htmlFor="public">Make this list public</Label>
              </div>
              <Button onClick={handleCreateList} className="w-full">
                Create List
              </Button>
            </div>
          </DialogContent>
        </Dialog>
      </div>

      {lists.length === 0 ? (
        <Card>
          <CardContent className="py-8 text-center">
            <p className="text-muted-foreground mb-4">You haven't created any lists yet.</p>
            <Button onClick={() => setIsCreateDialogOpen(true)}>
              <Plus className="h-4 w-4 mr-2" />
              Create Your First List
            </Button>
          </CardContent>
        </Card>
      ) : (
        <div className="grid gap-4">
          {lists.map((list) => (
            <Card key={list.id}>
              <CardHeader>
                <div className="flex justify-between items-start">
                  <div>
                    <CardTitle>{list.title}</CardTitle>
                    {list.description && (
                      <CardDescription>{list.description}</CardDescription>
                    )}
                    <div className="flex gap-2 mt-2">
                      <span className="text-xs bg-secondary px-2 py-1 rounded">
                        {list.list_type}
                      </span>
                      <span className="text-xs bg-secondary px-2 py-1 rounded">
                        {list.items?.length || 0} items
                      </span>
                    </div>
                  </div>
                  <div className="flex gap-2">
                    <Button
                      variant="ghost"
                      size="icon"
                      onClick={() => handleToggleVisibility(list)}
                      title={list.is_public ? "Make private" : "Make public"}
                    >
                      {list.is_public ? (
                        <Eye className="h-4 w-4" />
                      ) : (
                        <EyeOff className="h-4 w-4" />
                      )}
                    </Button>
                    <Button
                      variant="ghost"
                      size="icon"
                      onClick={() => setEditingList(list)}
                    >
                      <Edit className="h-4 w-4" />
                    </Button>
                    <Button
                      variant="ghost"
                      size="icon"
                      onClick={() => handleDeleteList(list.id)}
                    >
                      <Trash2 className="h-4 w-4" />
                    </Button>
                  </div>
                </div>
              </CardHeader>
              <CardContent>
                {editingList?.id === list.id ? (
                  <ListItemEditor
                    list={list}
                    onUpdate={fetchLists}
                    onClose={() => setEditingList(null)}
                  />
                ) : (
                  <ListDisplay list={list} />
                )}
              </CardContent>
            </Card>
          ))}
        </div>
      )}
    </div>
  );
}
