"use client";

import { useState, useEffect } from "react";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
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 { toast } from "sonner";
import type { Customer } from "@/lib/types";

interface CustomerDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  customer?: Customer | null;
  onSaved: () => void;
}

export function CustomerDialog({
  open,
  onOpenChange,
  customer,
  onSaved,
}: CustomerDialogProps) {
  const [loading, setLoading] = useState(false);
  const [form, setForm] = useState({
    name: "",
    code: "",
    email: "",
    phone: "",
    address: "",
    contact_person: "",
    notes: "",
  });

  useEffect(() => {
    if (customer) {
      setForm({
        name: customer.name || "",
        code: customer.code || "",
        email: customer.email || "",
        phone: customer.phone || "",
        address: customer.address || "",
        contact_person: customer.contact_person || "",
        notes: customer.notes || "",
      });
    } else {
      setForm({
        name: "",
        code: "",
        email: "",
        phone: "",
        address: "",
        contact_person: "",
        notes: "",
      });
    }
  }, [customer, open]);

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    if (!form.name || !form.code) {
      toast.error("Name and code are required");
      return;
    }
    setLoading(true);
    try {
      const url = customer
        ? `/api/customers/${customer.id}`
        : "/api/customers";
      const res = await fetch(url, {
        method: customer ? "PUT" : "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(form),
      });
      if (!res.ok) {
        const err = await res.json();
        throw new Error(err.error || "Failed to save");
      }
      toast.success(customer ? "Customer updated" : "Customer created");
      onSaved();
      onOpenChange(false);
    } catch (err) {
      toast.error(err instanceof Error ? err.message : "Failed to save customer");
    } finally {
      setLoading(false);
    }
  }

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-lg">
        <DialogHeader>
          <DialogTitle>
            {customer ? "Edit Customer" : "Add Customer"}
          </DialogTitle>
        </DialogHeader>
        <form onSubmit={handleSubmit} className="flex flex-col gap-4 pt-2">
          <div className="grid grid-cols-2 gap-4">
            <div className="flex flex-col gap-2">
              <Label htmlFor="name">
                Company Name <span className="text-destructive">*</span>
              </Label>
              <Input
                id="name"
                value={form.name}
                onChange={(e) => setForm({ ...form, name: e.target.value })}
                placeholder="Acme Electronics"
                required
              />
            </div>
            <div className="flex flex-col gap-2">
              <Label htmlFor="code">
                Customer Code <span className="text-destructive">*</span>
              </Label>
              <Input
                id="code"
                value={form.code}
                onChange={(e) => setForm({ ...form, code: e.target.value.toUpperCase() })}
                placeholder="ACME"
                className="font-mono uppercase"
                required
              />
            </div>
          </div>

          <div className="grid grid-cols-2 gap-4">
            <div className="flex flex-col gap-2">
              <Label htmlFor="email">Email</Label>
              <Input
                id="email"
                type="email"
                value={form.email}
                onChange={(e) => setForm({ ...form, email: e.target.value })}
                placeholder="orders@acme.com"
              />
            </div>
            <div className="flex flex-col gap-2">
              <Label htmlFor="phone">Phone</Label>
              <Input
                id="phone"
                value={form.phone}
                onChange={(e) => setForm({ ...form, phone: e.target.value })}
                placeholder="+1 555-0123"
              />
            </div>
          </div>

          <div className="flex flex-col gap-2">
            <Label htmlFor="contact_person">Contact Person</Label>
            <Input
              id="contact_person"
              value={form.contact_person}
              onChange={(e) => setForm({ ...form, contact_person: e.target.value })}
              placeholder="John Doe"
            />
          </div>

          <div className="flex flex-col gap-2">
            <Label htmlFor="address">Address</Label>
            <Textarea
              id="address"
              value={form.address}
              onChange={(e) => setForm({ ...form, address: e.target.value })}
              placeholder="123 Main St, City, State 12345"
              rows={2}
            />
          </div>

          <div className="flex flex-col gap-2">
            <Label htmlFor="notes">Notes</Label>
            <Textarea
              id="notes"
              value={form.notes}
              onChange={(e) => setForm({ ...form, notes: e.target.value })}
              placeholder="Internal notes about this customer..."
              rows={2}
            />
          </div>

          <div className="flex justify-end gap-2 pt-2">
            <Button
              type="button"
              variant="outline"
              onClick={() => onOpenChange(false)}
            >
              Cancel
            </Button>
            <Button type="submit" disabled={loading}>
              {loading ? "Saving..." : customer ? "Update" : "Create"}
            </Button>
          </div>
        </form>
      </DialogContent>
    </Dialog>
  );
}