"use client";

import { useState, useEffect } from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import * as z from "zod";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Switch } from "@/components/ui/switch";
import { User } from "@/types";
import { toast } from "sonner";

const createSchema = z.object({
  name: z.string().min(1, "Name is required"),
  email: z.string().email("Invalid email address"),
  password: z.string().min(8, "Password must be at least 8 characters"),
  role: z.string().min(1, "Role is required"),
  active: z.boolean(),
});

type UserFormValues = z.infer<typeof createSchema>;

interface UserFormDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  user?: User | null;
  onUserCreated?: () => void;
}

export function UserFormDialog({
  open,
  onOpenChange,
  user,
  onUserCreated,
}: UserFormDialogProps) {
  const isEditing = !!user;
  const [submitting, setSubmitting] = useState(false);

  const form = useForm<UserFormValues>({
    resolver: zodResolver(createSchema),
    defaultValues: {
      name: "",
      email: "",
      password: "",
      role: "sales_user",
      active: true,
    },
  });

  useEffect(() => {
    if (user) {
      form.reset({
        name: user.name,
        email: user.email,
        password: "",
        role: user.role,
        active: user.active,
      });
    } else {
      form.reset({
        name: "",
        email: "",
        password: "",
        role: "sales_user",
        active: true,
      });
    }
  }, [user, form]);

  async function onSubmit(values: UserFormValues) {
    setSubmitting(true);
    try {
      const res = await fetch("/api/users", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(values),
      });
      const data = await res.json();
      if (!res.ok) {
        toast.error(data.error || "Failed to create user");
        return;
      }
      toast.success("User created");
      onOpenChange(false);
      onUserCreated?.();
    } catch {
      toast.error("Failed to create user");
    } finally {
      setSubmitting(false);
    }
  }

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-[450px]">
        <DialogHeader>
          <DialogTitle>{isEditing ? "Edit User" : "Add New User"}</DialogTitle>
          <DialogDescription>
            {isEditing
              ? "Update the user's information and permissions."
              : "Create a new user account that can sign in."}
          </DialogDescription>
        </DialogHeader>
        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-4">
            <FormField
              control={form.control}
              name="name"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Name</FormLabel>
                  <FormControl>
                    <Input placeholder="John Doe" {...field} />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name="email"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Email</FormLabel>
                  <FormControl>
                    <Input
                      placeholder="john@coastit.co.za"
                      type="email"
                      {...field}
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name="role"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Role</FormLabel>
                  <Select
                    onValueChange={field.onChange}
                    defaultValue={field.value}
                  >
                    <FormControl>
                      <SelectTrigger>
                        <SelectValue placeholder="Select role" />
                      </SelectTrigger>
                    </FormControl>
                    <SelectContent>
                      <SelectItem value="super_admin">Super Admin</SelectItem>
                      <SelectItem value="admin">Admin</SelectItem>
                      <SelectItem value="sales">Sales</SelectItem>
                    </SelectContent>
                  </Select>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name="password"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Password</FormLabel>
                  <FormControl>
                    <Input
                      type="password"
                      placeholder={
                        isEditing
                          ? "Leave blank to keep current"
                          : "Enter password"
                      }
                      {...field}
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            <FormField
              control={form.control}
              name="active"
              render={({ field }) => (
                <FormItem className="flex items-center justify-between rounded-lg border p-3">
                  <div className="space-y-0.5">
                    <FormLabel>Active</FormLabel>
                    <p className="text-sm text-muted-foreground">
                      User can access the system
                    </p>
                  </div>
                  <FormControl>
                    <Switch
                      checked={field.value}
                      onCheckedChange={field.onChange}
                    />
                  </FormControl>
                </FormItem>
              )}
            />
            <DialogFooter>
              <Button
                type="button"
                variant="outline"
                onClick={() => onOpenChange(false)}
              >
                Cancel
              </Button>
              <Button type="submit" disabled={submitting}>
                {submitting
                  ? "Saving..."
                  : isEditing
                    ? "Save Changes"
                    : "Create User"}
              </Button>
            </DialogFooter>
          </form>
        </Form>
      </DialogContent>
    </Dialog>
  );
}
