"use client";

import { useState } from "react";
import { CalendarIcon } from "lucide-react";
import { format } from "date-fns";
import { useMutation, useQueryClient } from "@tanstack/react-query";

import { Button } from "@/components/ui/button";
import { Calendar } from "@/components/ui/calendar";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
import {
  Select,
  SelectContent,
  SelectGroup,
  SelectItem,
  SelectLabel,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { cn } from "@/lib/utils";
import { createInventoryItem } from "@/api/inventory";
import type { CreateInventoryItemInput } from "@/types";

export function AddInventoryItem() {
  const [date, setDate] = useState<Date | undefined>();
  const [open, setOpen] = useState(false);
  const [itemName, setItemName] = useState("");
  const [itemType, setItemType] = useState("");
  const [itemCategory, setItemCategory] = useState("");
  const [itemQuantity, setItemQuantity] = useState(0);
  const [itemUnit, setItemUnit] = useState("");

  const queryClient = useQueryClient();

  const mutation = useMutation({
    mutationFn: (item: CreateInventoryItemInput) => createInventoryItem(item),
    onSuccess: () => {
      // Invalidate queries to refresh inventory data.
      queryClient.invalidateQueries({ queryKey: ["inventoryItems"] });
      // Reset form fields and close dialog.
      setItemName("");
      setItemType("");
      setItemCategory("");
      setItemQuantity(0);
      setItemUnit("");
      setDate(undefined);
      setOpen(false);
    },
  });

  const handleSave = () => {
    // Basic validation (you can extend this as needed)
    if (!itemName || !itemType || !itemCategory || !itemUnit) return;
    mutation.mutate({
      name: itemName,
      type: itemType,
      category: itemCategory,
      quantity: itemQuantity,
      unit: itemUnit,
    });
  };

  return (
    <Dialog open={open} onOpenChange={setOpen}>
      <DialogTrigger asChild>
        <Button>Add New Item</Button>
      </DialogTrigger>
      <DialogContent className="sm:max-w-[425px]">
        <DialogHeader>
          <DialogTitle>Add Inventory Item</DialogTitle>
          <DialogDescription>Add a new plantation or fertilizer item to your inventory.</DialogDescription>
        </DialogHeader>
        <div className="grid gap-4 py-4">
          <div className="grid grid-cols-4 items-center gap-4">
            <Label htmlFor="name" className="text-right">
              Name
            </Label>
            <Input id="name" className="col-span-3" value={itemName} onChange={(e) => setItemName(e.target.value)} />
          </div>
          <div className="grid grid-cols-4 items-center gap-4">
            <Label htmlFor="type" className="text-right">
              Type
            </Label>
            <Select value={itemType} onValueChange={setItemType}>
              <SelectTrigger className="col-span-3">
                <SelectValue placeholder="Select type" />
              </SelectTrigger>
              <SelectContent>
                <SelectGroup>
                  <SelectLabel>Type</SelectLabel>
                  <SelectItem value="plantation">Plantation</SelectItem>
                  <SelectItem value="fertilizer">Fertilizer</SelectItem>
                </SelectGroup>
              </SelectContent>
            </Select>
          </div>
          <div className="grid grid-cols-4 items-center gap-4">
            <Label htmlFor="category" className="text-right">
              Category
            </Label>
            <Input
              id="category"
              className="col-span-3"
              placeholder="e.g., Seeds, Organic"
              value={itemCategory}
              onChange={(e) => setItemCategory(e.target.value)}
            />
          </div>
          <div className="grid grid-cols-4 items-center gap-4">
            <Label htmlFor="quantity" className="text-right">
              Quantity
            </Label>
            <Input
              id="quantity"
              type="number"
              className="col-span-3"
              value={itemQuantity}
              onChange={(e) => setItemQuantity(Number(e.target.value))}
            />
          </div>
          <div className="grid grid-cols-4 items-center gap-4">
            <Label htmlFor="unit" className="text-right">
              Unit
            </Label>
            <Input
              id="unit"
              className="col-span-3"
              placeholder="e.g., kg, packets"
              value={itemUnit}
              onChange={(e) => setItemUnit(e.target.value)}
            />
          </div>
          <div className="grid grid-cols-4 items-center gap-4">
            <Label htmlFor="date" className="text-right">
              Date
            </Label>
            <Popover>
              <PopoverTrigger asChild>
                <Button
                  variant={"outline"}
                  className={cn("col-span-3 justify-start text-left font-normal", !date && "text-muted-foreground")}>
                  <CalendarIcon className="mr-2 h-4 w-4" />
                  {date ? format(date, "PPP") : "Pick a date"}
                </Button>
              </PopoverTrigger>
              <PopoverContent className="w-auto p-0">
                <Calendar mode="single" selected={date} onSelect={setDate} initialFocus />
              </PopoverContent>
            </Popover>
          </div>
        </div>
        <DialogFooter>
          <Button type="submit" onClick={handleSave}>
            Save Item
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}