"use client";

import { useState } from "react";
import { Plus, ShoppingCart } from "lucide-react";
import { useRouter } from "next/navigation";
import { toast } from "sonner";
import { Button } from "@/components/ui/button";
import { Dialog, DialogContent, DialogHeader, DialogTitle } from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";

export function NewShoppingListButton() {
  const router = useRouter();
  const [open, setOpen] = useState(false);
  const [name, setName] = useState("");
  const [weekStart, setWeekStart] = useState("");
  const [saving, setSaving] = useState(false);

  async function create() {
    if (!name.trim()) return;
    setSaving(true);
    try {
      const res = await fetch("/api/v1/shopping-lists", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          name: name.trim(),
          fromMealPlanWeek: weekStart || undefined,
        }),
      });
      if (!res.ok) { toast.error("Failed to create"); return; }
      const { id } = await res.json() as { id: string };
      toast.success("List created");
      setOpen(false);
      setName(""); setWeekStart("");
      router.push(`/shopping-lists/${id}`);
    } finally {
      setSaving(false);
    }
  }

  return (
    <>
      <Button size="sm" onClick={() => setOpen(true)}>
        <Plus className="h-4 w-4" /> New list
      </Button>
      <Dialog open={open} onOpenChange={setOpen}>
        <DialogContent className="max-w-md">
          <DialogHeader><DialogTitle>New shopping list</DialogTitle></DialogHeader>
          <div className="space-y-4">
            <div className="space-y-2">
              <Label>Name</Label>
              <Input value={name} onChange={(e) => setName(e.target.value)} placeholder="Weekly groceries" />
            </div>
            <div className="space-y-2">
              <Label>Generate from meal plan week (optional)</Label>
              <Input type="date" value={weekStart} onChange={(e) => setWeekStart(e.target.value)} />
              <p className="text-xs text-muted-foreground">Picks Monday of the selected week</p>
            </div>
            <div className="flex gap-2 justify-end">
              <Button variant="outline" onClick={() => setOpen(false)}>Cancel</Button>
              <Button onClick={create} disabled={!name.trim() || saving}>{saving ? "Creating…" : "Create"}</Button>
            </div>
          </div>
        </DialogContent>
      </Dialog>
    </>
  );
}