"use client";

import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";
import {
  Field,
  FieldDescription,
  FieldGroup,
  FieldLabel,
  FieldSeparator,
} from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import Link from "next/link";
import { useState } from "react";
import { authClient } from "@/lib/auth-session/auth-client";
import { toast } from "sonner";
import { Loader2 } from "lucide-react";

export function SignupForm({
  className,
  ...props
}: React.ComponentProps<"form">) {
  const [name, setName] = useState("");
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");
  const [showPassword, setShowPassword] = useState(false);
  const [showConfirm, setShowConfirm] = useState(false);
  const [isLoading, setIsLoading] = useState(false);
  const [isGoogleLoading, setIsGoogleLoading] = useState(false);
  const [showVerifyNotice, setShowVerifyNotice] = useState(false);
  const [resendLoading, setResendLoading] = useState(false);
  const [resendSuccess, setResendSuccess] = useState(false);

  function togglePassword(e: React.MouseEvent<HTMLButtonElement>) {
    e.preventDefault();
    setShowPassword((s) => !s);
  }

  function toggleConfirm(e: React.MouseEvent<HTMLButtonElement>) {
    e.preventDefault();
    setShowConfirm((s) => !s);
  }

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setIsLoading(true);

    // Validate passwords match
    if (password !== confirmPassword) {
      toast.error("Passwords don't match", {
        description: "Please make sure both passwords are the same.",
      });
      setIsLoading(false);
      return;
    }
    if (!/[^A-Za-z0-9]/.test(password)) {
      toast.error("Password must contain at least one special character", {
        description:
          "Please include at least one special character in your password.",
      });
      setIsLoading(false);
      return;
    }
    // Validate password length
    if (password.length < 8) {
      toast.error("Password too short", {
        description: "Password must be at least 8 characters long.",
      });
      setIsLoading(false);
      return;
    }

    try {
      const { error } = await authClient.signUp.email({
        email,
        password,
        name,
      });

      if (error) {
        if (error.status === 403) {
          setShowVerifyNotice(true);
          toast.error("Please verify your email address", {
            description: "Check your inbox for the verification link.",
          });
        } else {
          setShowVerifyNotice(false);
          toast.error("Sign up failed", {
            description:
              error.message || "Unable to create account. Please try again.",
          });
        }
      } else {
        setShowVerifyNotice(false);
        toast.success("Account created successfully!", {
          description: "Please check your email to verify your account.",
        });
        // Redirect to login page after successful signup using full page reload
        setTimeout(() => {
          window.location.href = "/sign-in";
        }, 2000);
      }
    } catch {
      toast.error("An unexpected error occurred", {
        description: "Please try again later.",
      });
    } finally {
      setIsLoading(false);
    }
  }

  async function handleResendVerification(
    e: React.MouseEvent<HTMLButtonElement>
  ) {
    e.preventDefault();
    setResendLoading(true);
    setResendSuccess(false);
    try {
      const res = await fetch("/api/auth/resend-verification", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ email }),
      });
      if (res.ok) {
        setResendSuccess(true);
        toast.success("Verification email sent!", {
          description: "Check your inbox for the verification link.",
        });
      } else {
        toast.error("Failed to resend verification email.");
      }
    } catch {
      toast.error("Failed to resend verification email.");
    } finally {
      setResendLoading(false);
    }
  }

  async function handleGoogleSignUp() {
    try {
      setIsGoogleLoading(true);
      // Google OAuth will redirect to Google, then back to callback
      // The onAfterSignUp hook in auth.ts assigns "patient" role to new users
      // After callback, the auth layout redirects to the role-specific dashboard
      await authClient.signIn.social({
        provider: "google",
      });
    } catch (error) {
      console.error("Google sign-up failed:", error);
      toast.error("Google sign-up failed", {
        description: "Please try again.",
      });
      setIsGoogleLoading(false);
    }
  }

  return (
    <form
      className={cn("flex flex-col gap-3", className)}
      {...props}
      onSubmit={handleSubmit}
    >
      {showVerifyNotice && (
        <div className="bg-yellow-100 border border-yellow-300 text-yellow-800 rounded p-3 text-center mb-2">
          <div className="mb-2">
            Your email is not verified. Please check your inbox for the
            verification link.
          </div>
          <button
            type="button"
            className="underline text-sm text-blue-700 disabled:opacity-60"
            onClick={handleResendVerification}
            disabled={resendLoading || resendSuccess}
          >
            {resendLoading
              ? "Resending..."
              : resendSuccess
                ? "Verification Sent!"
                : "Resend Verification Email"}
          </button>
        </div>
      )}
      <FieldGroup className="gap-3">
        <div className="flex flex-col items-center text-center mb-2">
          <h1 className="text-2xl font-bold">Create your account</h1>
          <p className="text-muted-foreground text-sm">
            Fill in the form below to create your account
          </p>
        </div>
        <Field className="gap-1">
          <FieldLabel htmlFor="name" className="text-xs">
            Full Name
          </FieldLabel>
          <Input
            id="name"
            type="text"
            placeholder="Name"
            value={name}
            onChange={(e) => setName(e.target.value)}
            disabled={isLoading}
            required
          />
        </Field>
        <Field className="gap-1">
          <FieldLabel htmlFor="email" className="text-xs">
            Email
          </FieldLabel>
          <Input
            id="email"
            type="email"
            placeholder="e.g m@gmail.com"
            value={email}
            onChange={(e) => setEmail(e.target.value)}
            disabled={isLoading}
            required
            className="h-9"
          />
          <FieldDescription className="text-xs leading-tight">
            We&apos;ll use this to contact you.
          </FieldDescription>
        </Field>
        <Field className="gap-1">
          <FieldLabel htmlFor="password" className="text-xs">
            Password
          </FieldLabel>
          <div className="relative">
            <Input
              id="password"
              type={showPassword ? "text" : "password"}
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              disabled={isLoading}
              minLength={8}
              required
              className="h-9"
            />
            <button
              aria-label={showPassword ? "Hide password" : "Show password"}
              onClick={togglePassword}
              type="button"
              className="absolute right-2 top-1/2 -translate-y-1/2 inline-flex items-center justify-center p-1 text-sm opacity-70 hover:opacity-100"
            >
              {showPassword ? (
                <svg
                  xmlns="http://www.w3.org/2000/svg"
                  width="14"
                  height="14"
                  fill="none"
                  viewBox="0 0 24 24"
                  stroke="currentColor"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth="2"
                    d="M13.875 18.825A10.05 10.05 0 0112 19c-5.523 0-10-4.477-10-10a9.97 9.97 0 012.175-5.875M6.343 6.343A9.97 9.97 0 0112 5c5.523 0 10 4.477 10 10 0 1.042-.161 2.045-.463 2.998M3 3l18 18"
                  />
                </svg>
              ) : (
                <svg
                  xmlns="http://www.w3.org/2000/svg"
                  width="14"
                  height="14"
                  fill="none"
                  viewBox="0 0 24 24"
                  stroke="currentColor"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth="2"
                    d="M15 12a3 3 0 11-6 0 3 3 0 016 0z"
                  />
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth="2"
                    d="M2.458 12C3.732 7.943 7.523 5 12 5c4.477 0 8.268 2.943 9.542 7-1.274 4.057-5.065 7-9.542 7-4.477 0-8.268-2.943-9.542-7z"
                  />
                </svg>
              )}
            </button>
          </div>
          <FieldDescription className="text-xs leading-tight">
            Must be at least 8 characters long.
          </FieldDescription>
        </Field>
        <Field className="gap-1">
          <FieldLabel htmlFor="confirm-password" className="text-xs">
            Confirm Password
          </FieldLabel>
          <div className="relative">
            <Input
              id="confirm-password"
              type={showConfirm ? "text" : "password"}
              value={confirmPassword}
              onChange={(e) => setConfirmPassword(e.target.value)}
              disabled={isLoading}
              minLength={8}
              required
              className="h-9"
            />
            <button
              aria-label={
                showConfirm ? "Hide confirm password" : "Show confirm password"
              }
              onClick={toggleConfirm}
              type="button"
              className="absolute right-2 top-1/2 -translate-y-1/2 inline-flex items-center justify-center p-1 text-sm opacity-70 hover:opacity-100"
            >
              {showConfirm ? (
                <svg
                  xmlns="http://www.w3.org/2000/svg"
                  width="14"
                  height="14"
                  fill="none"
                  viewBox="0 0 24 24"
                  stroke="currentColor"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth="2"
                    d="M13.875 18.825A10.05 10.05 0 0112 19c-5.523 0-10-4.477-10-10a9.97 9.97 0 012.175-5.875M6.343 6.343A9.97 9.97 0 0112 5c5.523 0 10 4.477 10 10 0 1.042-.161 2.045-.463 2.998M3 3l18 18"
                  />
                </svg>
              ) : (
                <svg
                  xmlns="http://www.w3.org/2000/svg"
                  width="14"
                  height="14"
                  fill="none"
                  viewBox="0 0 24 24"
                  stroke="currentColor"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth="2"
                    d="M15 12a3 3 0 11-6 0 3 3 0 016 0z"
                  />
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth="2"
                    d="M2.458 12C3.732 7.943 7.523 5 12 5c4.477 0 8.268 2.943 9.542 7-1.274 4.057-5.065 7-9.542 7-4.477 0-8.268-2.943-9.542-7z"
                  />
                </svg>
              )}
            </button>
          </div>
          <FieldDescription className="text-xs leading-tight">
            Please confirm your password.
          </FieldDescription>
        </Field>
        <Field className="gap-1">
          <Button
            type="submit"
            disabled={isLoading || isGoogleLoading}
            className="h-9"
          >
            {isLoading ? (
              <>
                <Loader2 className="size-4 animate-spin mr-2" />
                Creating account...
              </>
            ) : (
              "Create Account"
            )}
          </Button>
        </Field>
        <FieldSeparator>Or continue with</FieldSeparator>
        <Field>
          <Button
            variant="outline"
            type="button"
            onClick={handleGoogleSignUp}
            disabled={isLoading || isGoogleLoading}
          >
            <svg
              width="800px"
              height="800px"
              viewBox="-3 0 262 262"
              xmlns="http://www.w3.org/2000/svg"
              preserveAspectRatio="xMidYMid"
            >
              <path
                d="M255.878 133.451c0-10.734-.871-18.567-2.756-26.69H130.55v48.448h71.947c-1.45 12.04-9.283 30.172-26.69 42.356l-.244 1.622 38.755 30.023 2.685.268c24.659-22.774 38.875-56.282 38.875-96.027"
                fill="#4285F4"
              />
              <path
                d="M130.55 261.1c35.248 0 64.839-11.605 86.453-31.622l-41.196-31.913c-11.024 7.688-25.82 13.055-45.257 13.055-34.523 0-63.824-22.773-74.269-54.25l-1.531.13-40.298 31.187-.527 1.465C35.393 231.798 79.49 261.1 130.55 261.1"
                fill="#34A853"
              />
              <path
                d="M56.281 156.37c-2.756-8.123-4.351-16.827-4.351-25.82 0-8.994 1.595-17.697 4.206-25.82l-.073-1.73L15.26 71.312l-1.335.635C5.077 89.644 0 109.517 0 130.55s5.077 40.905 13.925 58.602l42.356-32.782"
                fill="#FBBC05"
              />
              <path
                d="M130.55 50.479c24.514 0 41.05 10.589 50.479 19.438l36.844-35.974C195.245 12.91 165.798 0 130.55 0 79.49 0 35.393 29.301 13.925 71.947l42.211 32.783c10.59-31.477 39.891-54.251 74.414-54.251"
                fill="#EB4335"
              />
            </svg>
            {isGoogleLoading ? "Signing up..." : "Sign up with Google"}
          </Button>
          <FieldDescription className="px-6 text-center">
            Already have an account? <Link href="/sign-in">Sign in</Link>
          </FieldDescription>
        </Field>
      </FieldGroup>
    </form>
  );
}