"use client";

import { useState, useEffect } from "react";
import { Button } from "@/components/ui/button";
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 { Sheet, SheetContent, SheetHeader, SheetTitle, SheetDescription } from "@/components/ui/sheet";
import { Command, CommandEmpty, CommandGroup, CommandInput, CommandItem, CommandList } from "@/components/ui/command";
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
import { toast } from "sonner";
import { Loader2, ChevronsUpDown, Check } from "lucide-react";
import getPocketBase from "@/lib/pocketbase";
import {
  getAllCustomers,
  getAllCompanies,
  getAllSuppliers,
  generateOrderNumber,
} from "@/lib/pb-helpers";
import { cn } from "@/lib/utils";
import type { Customer, Company, Supplier, Order, OrderStatus } from "@/lib/types";

interface OrderFormProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  order?: Order | null;
  onSaved: () => void;
}

export function OrderForm({ open, onOpenChange, order, onSaved }: OrderFormProps) {
  const [loading, setLoading] = useState(false);
  const [customers, setCustomers] = useState<Customer[]>([]);
  const [companies, setCompanies] = useState<Company[]>([]);
  const [suppliers, setSuppliers] = useState<Supplier[]>([]);
  const [customerOpen, setCustomerOpen] = useState(false);
  const [companyOpen, setCompanyOpen] = useState(false);

  const [form, setForm] = useState({
    order_number: "",
    customer: "",
    company: "",
    quote: "",
    status: "new" as OrderStatus,
    notes: "",
  });

  useEffect(() => {
    if (open) {
      loadDropdowns();
      if (order) {
        setForm({
          order_number: order.order_number,
          customer: order.customer || "",
          company: order.company,
          quote: order.quote || "",
          status: order.status,
          notes: order.notes || "",
        });
      } else {
        initNewOrder();
      }
    }
  }, [open, order]);

  const loadDropdowns = async () => {
    try {
      const [custs, comps, supps] = await Promise.all([
        getAllCustomers(),
        getAllCompanies(),
        getAllSuppliers(),
      ]);
      setCustomers(custs);
      setCompanies(comps);
      setSuppliers(supps);
    } catch {
      toast.error("Failed to load dropdowns");
    }
  };

  const initNewOrder = async () => {
    try {
      const orderNum = await generateOrderNumber();
      setForm({
        order_number: orderNum,
        customer: "",
        company: "",
        quote: "",
        status: "new",
        notes: "",
      });
    } catch {
      toast.error("Failed to generate order number");
    }
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!form.company) {
      toast.error("Please select a company");
      return;
    }

    setLoading(true);
    try {
      const pb = getPocketBase();
      if (order) {
        await pb.collection("orders").update(order.id, form);
        toast.success("Order updated");
      } else {
        await pb.collection("orders").create(form);
        toast.success("Order created");
      }
      onSaved();
      onOpenChange(false);
    } catch (err: unknown) {
      const message = err instanceof Error ? err.message : "Failed to save order";
      toast.error(message);
    } finally {
      setLoading(false);
    }
  };

  const getCustomerName = (id: string) => customers.find((c) => c.id === id)?.customer || "";
  const getCompanyName = (id: string) => companies.find((c) => c.id === id)?.company || "";

  return (
    <Sheet open={open} onOpenChange={onOpenChange}>
      <SheetContent className="w-full sm:max-w-lg overflow-y-auto">
        <SheetHeader>
          <SheetTitle>{order ? "Edit Order" : "New Order"}</SheetTitle>
          <SheetDescription>
            {order ? `Editing ${order.order_number}` : "Create a new order"}
          </SheetDescription>
        </SheetHeader>
        <form onSubmit={handleSubmit} className="space-y-6 mt-6">
          <div className="space-y-2">
            <Label>Order Number</Label>
            <Input value={form.order_number} readOnly className="bg-muted" />
          </div>

          <div className="grid grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label>Customer</Label>
              <Popover open={customerOpen} onOpenChange={setCustomerOpen}>
                <PopoverTrigger
                  className="w-full justify-between inline-flex items-center rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 [&>span]:line-clamp-1"
                >
                  {form.customer ? getCustomerName(form.customer) : "Select customer..."}
                  <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
                </PopoverTrigger>
                <PopoverContent className="w-full p-0">
                  <Command>
                    <CommandInput placeholder="Search customers..." />
                    <CommandList>
                      <CommandEmpty>No customer found.</CommandEmpty>
                      <CommandGroup>
                        {customers.map((c) => (
                          <CommandItem
                            key={c.id}
                            value={c.customer}
                            onSelect={() => {
                              setForm({ ...form, customer: c.id });
                              setCustomerOpen(false);
                            }}
                          >
                            <Check className={cn("mr-2 h-4 w-4", form.customer === c.id ? "opacity-100" : "opacity-0")} />
                            {c.customer}
                          </CommandItem>
                        ))}
                      </CommandGroup>
                    </CommandList>
                  </Command>
                </PopoverContent>
              </Popover>
            </div>

            <div className="space-y-2">
              <Label>Company *</Label>
              <Popover open={companyOpen} onOpenChange={setCompanyOpen}>
                <PopoverTrigger
                  className="w-full justify-between inline-flex items-center rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 [&>span]:line-clamp-1"
                >
                  {form.company ? getCompanyName(form.company) : "Select company..."}
                  <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
                </PopoverTrigger>
                <PopoverContent className="w-full p-0">
                  <Command>
                    <CommandInput placeholder="Search companies..." />
                    <CommandList>
                      <CommandEmpty>No company found.</CommandEmpty>
                      <CommandGroup>
                        {companies.map((c) => (
                          <CommandItem
                            key={c.id}
                            value={c.company}
                            onSelect={() => {
                              setForm({ ...form, company: c.id });
                              setCompanyOpen(false);
                            }}
                          >
                            <Check className={cn("mr-2 h-4 w-4", form.company === c.id ? "opacity-100" : "opacity-0")} />
                            {c.company}
                          </CommandItem>
                        ))}
                      </CommandGroup>
                    </CommandList>
                  </Command>
                </PopoverContent>
              </Popover>
            </div>
          </div>

          {order && (
            <div className="space-y-2">
              <Label>Status</Label>
              <Select value={form.status} onValueChange={(v) => setForm({ ...form, status: (v || "new") as OrderStatus })}>
                <SelectTrigger>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="new">New</SelectItem>
                  <SelectItem value="processing">Processing</SelectItem>
                  <SelectItem value="order_ready">Order Ready</SelectItem>
                  <SelectItem value="po_generated">PO Generated</SelectItem>
                  <SelectItem value="completed">Completed</SelectItem>
                  <SelectItem value="cancelled">Cancelled</SelectItem>
                </SelectContent>
              </Select>
            </div>
          )}

          <div className="space-y-2">
            <Label>Notes</Label>
            <Textarea
              value={form.notes}
              onChange={(e) => setForm({ ...form, notes: e.target.value })}
              rows={3}
            />
          </div>

          <div className="flex gap-3 pt-4">
            <Button type="submit" disabled={loading} className="flex-1">
              {loading && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
              {order ? "Update" : "Create"} Order
            </Button>
            <Button type="button" variant="outline" onClick={() => onOpenChange(false)}>
              Cancel
            </Button>
          </div>
        </form>
      </SheetContent>
    </Sheet>
  );
}