import { useState, useEffect } from "react";
import { useNavigate } from "react-router-dom";

import "./index.css";
import BackgroundPattern from "../../Components/BackgroundPattern/BackgroundPattern";
import Logomark from "../../assets/Images/bwl-logo-2.svg?react";
import Check from "../../Components/Check/Check";
import Button from "../../Components/Button";
import Google from "../../assets/Images/Google.png";
import { credentials } from "../../Validation/validation";
import axiosInstance from "../../Utils/axiosConfig";
import { useDispatch } from "react-redux";
import { register } from "../../Features/Auth/authSlice";
import { createToast } from "../../Utils/toastUtils";
import Field from "../../Components/Inputs/Field";
import { useTheme } from "@emotion/react";
import { Divider, Stack, Typography } from "@mui/material";

const Register = () => {
  const dispatch = useDispatch();
  const navigate = useNavigate();
  const theme = useTheme();

  // TODO If possible, change the IDs of these fields to match the backend
  const idMap = {
    "register-firstname-input": "firstname",
    "register-lastname-input": "lastname",
    "register-email-input": "email",
    "register-password-input": "password",
    "register-confirm-input": "confirm",
  };

  const [form, setForm] = useState({
    firstname: "",
    lastname: "",
    email: "",
    password: "",
    confirm: "",
    role: "",
  });
  const [errors, setErrors] = useState({});

  useEffect(() => {
    axiosInstance
      .get("/auth/users/admin")
      .then((response) => {
        if (response.data.data === true) {
          navigate("/login");
        }
      })
      .catch((error) => {
        console.log(error);
      });
  }, [form, navigate]);

  const handleSubmit = async (e) => {
    e.preventDefault();

    const adminForm = { ...form, role: "admin" };
    const { error } = credentials.validate(adminForm, {
      abortEarly: false,
      context: { password: form.password },
    });

    if (error) {
      // validation errors
      const newErrors = {};
      error.details.forEach((err) => {
        newErrors[err.path[0]] = err.message;
      });
      setErrors(newErrors);
      createToast({
        variant: "info",
        body:
          error.details && error.details.length > 0
            ? error.details[0].message
            : "Error validating data.",
        hasIcon: false,
      });
    } else {
      delete adminForm.confirm;
      const action = await dispatch(register(adminForm));
      if (action.payload.success) {
        const token = action.payload.data;
        localStorage.setItem("token", token);
        navigate("/");
        createToast({
          variant: "info",
          body: "Welcome! Your account was created successfully.",
          hasIcon: false,
        });
      } else {
        if (action.payload) {
          // dispatch errors
          createToast({
            variant: "info",
            body: action.payload.msg,
            hasIcon: false,
          });
        } else {
          // unknown errors
          createToast({
            variant: "info",
            body: "Unknown error.",
            hasIcon: false,
          });
        }
      }
    }
  };

  const handleChange = (event) => {
    const { value, id } = event.target;
    const name = idMap[id];
    setForm((prev) => ({
      ...prev,
      [name]: value,
    }));

    const { error } = credentials.validate(
      { [name]: value },
      { abortEarly: false, context: { password: form.password } }
    );

    setErrors((prev) => {
      const prevErrors = { ...prev };
      if (error) prevErrors[name] = error.details[0].message;
      else delete prevErrors[name];
      return prevErrors;
    });
  };

  return (
    <div className="register-page">
      <BackgroundPattern></BackgroundPattern>
      <form className="register-form" onSubmit={handleSubmit} noValidate>
        <Stack gap={theme.gap.large} direction="column">
          <Logomark alt="BlueWave Uptime Icon" />
          <Button
            level="secondary"
            label="Sign up with Google"
            sx={{ fontWeight: 600, mt: theme.gap.xxl }}
            img={<img className="google-enter" src={Google} alt="Google" />}
          />
          <Divider>
            <Typography>or</Typography>
          </Divider>
          <Field
            id="register-firstname-input"
            label="Name"
            isRequired={true}
            placeholder="Daniel"
            autoComplete="given-name"
            value={form.firstname}
            onChange={handleChange}
            error={errors.firstname}
          />
          <Field
            id="register-lastname-input"
            label="Surname"
            isRequired={true}
            placeholder="Cojocea"
            autoComplete="family-name"
            value={form.lastname}
            onChange={handleChange}
            error={errors.lastname}
          />
          <Field
            type="email"
            id="register-email-input"
            label="Email"
            isRequired={true}
            placeholder="daniel.cojocea@domain.com"
            autoComplete="email"
            value={form.email}
            onChange={handleChange}
            error={errors.email}
          />
          <Field
            type="password"
            id="register-password-input"
            label="Password"
            isRequired={true}
            placeholder="Create a password"
            autoComplete="current-password"
            value={form.password}
            onChange={handleChange}
            error={errors.password}
          />
          <Field
            type="password"
            id="register-confirm-input"
            label="Confirm password"
            isRequired={true}
            placeholder="Confirm your password"
            autoComplete="current-password"
            value={form.confirm}
            onChange={handleChange}
            error={errors.confirm}
          />
          <Stack gap={theme.gap.small}>
            <Check
              text="Must be at least 8 characters long"
              variant={
                errors?.password === "Password is required"
                  ? "error"
                  : form.password === ""
                  ? "info"
                  : form.password.length < 8
                  ? "error"
                  : "success"
              }
            />
            <Check
              text="Must contain one special character and a number"
              variant={
                errors?.password === "Password is required"
                  ? "error"
                  : form.password === ""
                  ? "info"
                  : !/^(?=.*[!@#$%^&*(),.?":{}|])(?=.*\d).+$/.test(
                      form.password
                    )
                  ? "error"
                  : "success"
              }
            />
            <Check
              text="Must contain at least one upper and lower character"
              variant={
                errors?.password === "Password is required"
                  ? "error"
                  : form.password === ""
                  ? "info"
                  : !/^(?=.*[A-Z])(?=.*[a-z]).+$/.test(form.password)
                  ? "error"
                  : "success"
              }
            />
          </Stack>
          <Button
            type="submit"
            level="primary"
            label="Get started"
            sx={{ marginBottom: theme.gap.large }}
            disabled={Object.keys(errors).length !== 0 && true}
          />
        </Stack>
      </form>
    </div>
  );
};

export default Register;