import { GridCard } from "@/components/Card";
import { useState } from "react";
import { Button } from "@components/Button";
import LogoBlueIcon from "@/assets/logo-blue.svg";
import LogoWhiteIcon from "@/assets/logo-white.svg";
import { InputFieldWithLabel } from "@/components/InputField";
import api from "@/api";
import { useLocalAuthModalStore } from "@/hooks/stores";
import { useNavigate } from "react-router-dom";

export default function LocalAuthRoute() {
  const navigate = useNavigate();

  return (
    <GridCard cardClassName="relative mx-auto max-w-md text-left pointer-events-auto">
      {/* TODO: Migrate to using URLs instead of the global state. To simplify the refactoring, we'll keep the global state for now. */}
      <Dialog
        // Effectively fetch the loaders from devices.$id.tsx to get new settings
        onClose={open => {
          if (!open) navigate("..");
        }}
      />
    </GridCard>
  );
}

export function Dialog({ onClose }: { onClose: (open: boolean) => void }) {
  const { modalView, setModalView } = useLocalAuthModalStore();
  const [error, setError] = useState<string | null>(null);

  const handleCreatePassword = async (password: string, confirmPassword: string) => {
    if (password === "") {
      setError("Please enter a password");
      return;
    }

    if (password !== confirmPassword) {
      setError("Passwords do not match");
      return;
    }

    try {
      const res = await api.POST("/auth/password-local", { password });
      if (res.ok) {
        setModalView("creationSuccess");
      } else {
        const data = await res.json();
        setError(data.error || "An error occurred while setting the password");
      }
    } catch (error) {
      setError("An error occurred while setting the password");
    }
  };

  const handleUpdatePassword = async (
    oldPassword: string,
    newPassword: string,
    confirmNewPassword: string,
  ) => {
    if (newPassword !== confirmNewPassword) {
      setError("Passwords do not match");
      return;
    }

    if (oldPassword === "") {
      setError("Please enter your old password");
      return;
    }

    if (newPassword === "") {
      setError("Please enter a new password");
      return;
    }

    try {
      const res = await api.PUT("/auth/password-local", {
        oldPassword,
        newPassword,
      });

      if (res.ok) {
        setModalView("updateSuccess");
      } else {
        const data = await res.json();
        setError(data.error || "An error occurred while changing the password");
      }
    } catch (error) {
      setError("An error occurred while changing the password");
    }
  };

  const handleDeletePassword = async (password: string) => {
    if (password === "") {
      setError("Please enter your current password");
      return;
    }

    try {
      const res = await api.DELETE("/auth/local-password", { password });
      if (res.ok) {
        setModalView("deleteSuccess");
      } else {
        const data = await res.json();
        setError(data.error || "An error occurred while disabling the password");
      }
    } catch (error) {
      setError("An error occurred while disabling the password");
    }
  };

  return (
    <GridCard cardClassName="relative max-w-lg mx-auto text-left pointer-events-auto dark:bg-slate-800">
      <div className="p-10">
        {modalView === "createPassword" && (
          <CreatePasswordModal
            onSetPassword={handleCreatePassword}
            onCancel={() => onClose(false)}
            error={error}
          />
        )}

        {modalView === "deletePassword" && (
          <DeletePasswordModal
            onDeletePassword={handleDeletePassword}
            onCancel={() => onClose(false)}
            error={error}
          />
        )}

        {modalView === "updatePassword" && (
          <UpdatePasswordModal
            onUpdatePassword={handleUpdatePassword}
            onCancel={() => onClose(false)}
            error={error}
          />
        )}

        {modalView === "creationSuccess" && (
          <SuccessModal
            headline="Password Set Successfully"
            description="You've successfully set up local device protection. Your device is now secure against unauthorized local access."
            onClose={() => onClose(false)}
          />
        )}

        {modalView === "deleteSuccess" && (
          <SuccessModal
            headline="Password Protection Disabled"
            description="You've successfully disabled the password protection for local access. Remember, your device is now less secure."
            onClose={() => onClose(false)}
          />
        )}

        {modalView === "updateSuccess" && (
          <SuccessModal
            headline="Password Updated Successfully"
            description="You've successfully changed your local device protection password. Make sure to remember your new password for future access."
            onClose={() => onClose(false)}
          />
        )}
      </div>
    </GridCard>
  );
}

function CreatePasswordModal({
  onSetPassword,
  onCancel,
  error,
}: {
  onSetPassword: (password: string, confirmPassword: string) => void;
  onCancel: () => void;
  error: string | null;
}) {
  const [password, setPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");

  return (
    <div className="flex flex-col items-start justify-start space-y-4 text-left">
      <div>
        <img src={LogoWhiteIcon} alt="" className="hidden h-[24px] dark:block" />
        <img src={LogoBlueIcon} alt="" className="h-[24px] dark:hidden" />
      </div>
      <div className="space-y-4">
        <div>
          <h2 className="text-lg font-semibold dark:text-white">
            Local Device Protection
          </h2>
          <p className="text-sm text-slate-600 dark:text-slate-400">
            Create a password to protect your device from unauthorized local access.
          </p>
        </div>
        <InputFieldWithLabel
          label="New Password"
          type="password"
          placeholder="Enter a strong password"
          value={password}
          autoFocus
          onChange={e => setPassword(e.target.value)}
        />
        <InputFieldWithLabel
          label="Confirm New Password"
          type="password"
          placeholder="Re-enter your password"
          value={confirmPassword}
          onChange={e => setConfirmPassword(e.target.value)}
        />

        <div className="flex gap-x-2">
          <Button
            size="SM"
            theme="primary"
            text="Secure Device"
            onClick={() => onSetPassword(password, confirmPassword)}
          />
          <Button size="SM" theme="light" text="Not Now" onClick={onCancel} />
        </div>
        {error && <p className="text-sm text-red-500">{error}</p>}
      </div>
    </div>
  );
}

function DeletePasswordModal({
  onDeletePassword,
  onCancel,
  error,
}: {
  onDeletePassword: (password: string) => void;
  onCancel: () => void;
  error: string | null;
}) {
  const [password, setPassword] = useState("");

  return (
    <div className="flex flex-col items-start justify-start space-y-4 text-left">
      <div>
        <img src={LogoWhiteIcon} alt="" className="hidden h-[24px] dark:block" />
        <img src={LogoBlueIcon} alt="" className="h-[24px] dark:hidden" />
      </div>
      <div className="space-y-4">
        <div>
          <h2 className="text-lg font-semibold dark:text-white">
            Disable Local Device Protection
          </h2>
          <p className="text-sm text-slate-600 dark:text-slate-400">
            Enter your current password to disable local device protection.
          </p>
        </div>
        <InputFieldWithLabel
          label="Current Password"
          type="password"
          placeholder="Enter your current password"
          value={password}
          onChange={e => setPassword(e.target.value)}
        />
        <div className="flex gap-x-2">
          <Button
            size="SM"
            theme="danger"
            text="Disable Protection"
            onClick={() => onDeletePassword(password)}
          />
          <Button size="SM" theme="light" text="Cancel" onClick={onCancel} />
        </div>
        {error && <p className="text-sm text-red-500">{error}</p>}
      </div>
    </div>
  );
}

function UpdatePasswordModal({
  onUpdatePassword,
  onCancel,
  error,
}: {
  onUpdatePassword: (
    oldPassword: string,
    newPassword: string,
    confirmNewPassword: string,
  ) => void;
  onCancel: () => void;
  error: string | null;
}) {
  const [oldPassword, setOldPassword] = useState("");
  const [newPassword, setNewPassword] = useState("");
  const [confirmNewPassword, setConfirmNewPassword] = useState("");

  return (
    <div className="flex flex-col items-start justify-start space-y-4 text-left">
      <div>
        <img src={LogoWhiteIcon} alt="" className="hidden h-[24px] dark:block" />
        <img src={LogoBlueIcon} alt="" className="h-[24px] dark:hidden" />
      </div>
      <div className="space-y-4">
        <div>
          <h2 className="text-lg font-semibold dark:text-white">
            Change Local Device Password
          </h2>
          <p className="text-sm text-slate-600 dark:text-slate-400">
            Enter your current password and a new password to update your local device
            protection.
          </p>
        </div>
        <InputFieldWithLabel
          label="Current Password"
          type="password"
          placeholder="Enter your current password"
          value={oldPassword}
          onChange={e => setOldPassword(e.target.value)}
        />
        <InputFieldWithLabel
          label="New Password"
          type="password"
          placeholder="Enter a new strong password"
          value={newPassword}
          onChange={e => setNewPassword(e.target.value)}
        />
        <InputFieldWithLabel
          label="Confirm New Password"
          type="password"
          placeholder="Re-enter your new password"
          value={confirmNewPassword}
          onChange={e => setConfirmNewPassword(e.target.value)}
        />
        <div className="flex gap-x-2">
          <Button
            size="SM"
            theme="primary"
            text="Update Password"
            onClick={() => onUpdatePassword(oldPassword, newPassword, confirmNewPassword)}
          />
          <Button size="SM" theme="light" text="Cancel" onClick={onCancel} />
        </div>
        {error && <p className="text-sm text-red-500">{error}</p>}
      </div>
    </div>
  );
}

function SuccessModal({
  headline,
  description,
  onClose,
}: {
  headline: string;
  description: string;
  onClose: () => void;
}) {
  return (
    <div className="flex w-full max-w-lg flex-col items-start justify-start space-y-4 text-left">
      <div>
        <img src={LogoWhiteIcon} alt="" className="hidden h-[24px] dark:block" />
        <img src={LogoBlueIcon} alt="" className="h-[24px] dark:hidden" />
      </div>
      <div className="space-y-4">
        <div>
          <h2 className="text-lg font-semibold dark:text-white">{headline}</h2>
          <p className="text-sm text-slate-600 dark:text-slate-400">{description}</p>
        </div>
        <Button size="SM" theme="primary" text="Close" onClick={onClose} />
      </div>
    </div>
  );
}