import { Box, Stack, Typography } from "@mui/material";
import { useTheme } from "@emotion/react";
import { createToast } from "../../Utils/toastUtils";
import { useDispatch, useSelector } from "react-redux";
import { forgotPassword } from "../../Features/Auth/authSlice";
import { useEffect, useState } from "react";
import { credentials } from "../../Validation/validation";
import { useNavigate } from "react-router-dom";
import Field from "../../Components/Inputs/Field";
import ButtonSpinner from "../../Components/ButtonSpinner";
import Logo from "../../assets/icons/bwu-icon.svg?react";
import Key from "../../assets/icons/key.svg?react";
import background from "../../assets/Images/background_pattern_decorative.png";
import "./index.css";

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

  const { isLoading } = useSelector((state) => state.auth);
  const [errors, setErrors] = useState({});
  const [form, setForm] = useState({
    email: "",
  });

  useEffect(() => {
    const email = sessionStorage.getItem("email");
    email && setForm({ email: sessionStorage.getItem("email") });
  }, []);

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

    const { error } = credentials.validate(form, { abortEarly: false });

    if (error) {
      // validation errors
      const err =
        error.details && error.details.length > 0
          ? error.details[0].message
          : "Error validating data.";
      setErrors({ email: err });
      createToast({
        body: err,
      });
    } else {
      const action = await dispatch(forgotPassword(form));
      if (action.payload.success) {
        sessionStorage.setItem("email", form.email);
        navigate("/check-email");
        createToast({
          body: `Instructions sent to ${form.email}.`,
        });
      } else {
        if (action.payload) {
          // dispatch errors
          createToast({
            body: action.payload.msg,
          });
        } else {
          // unknown errors
          createToast({
            body: "Unknown error.",
          });
        }
      }
    }
  };

  const handleChange = (event) => {
    const { value } = event.target;
    setForm({ email: value });

    const { error } = credentials.validate(
      { email: value },
      { abortEarly: false }
    );

    if (error) setErrors({ email: error.details[0].message });
    else delete errors.email;
  };

  const handleNavigate = () => {
    sessionStorage.removeItem("email");
    navigate("/login");
  };

  return (
    <Stack className="forgot-password-page auth" overflow="hidden">
      <Box
        className="background-pattern-svg"
        sx={{ backgroundImage: `url(${background})` }}
      />
      <Stack
        direction="row"
        alignItems="center"
        px={theme.gap.large}
        gap={theme.gap.small}
      >
        <Logo style={{ borderRadius: theme.shape.borderRadius }} />
        <Typography sx={{ userSelect: "none" }}>BlueWave Uptime</Typography>
      </Stack>
      <Stack
        width="100%"
        maxWidth={600}
        flex={1}
        justifyContent="center"
        px={{ xs: theme.gap.large, lg: theme.gap.xl }}
        pb={theme.gap.xl}
        mx="auto"
        sx={{
          "& > .MuiStack-root": {
            border: 1,
            borderRadius: theme.shape.borderRadius,
            borderColor: theme.palette.otherColors.graishWhite,
            backgroundColor: theme.palette.otherColors.white,
            padding: {
              xs: theme.gap.large,
              sm: theme.gap.xl,
            },
          },
        }}
      >
        <Stack
          gap={{ xs: theme.gap.ml, sm: theme.gap.large }}
          alignItems="center"
          textAlign="center"
        >
          <Box>
            <Key alt="password key icon" />
            <Typography component="h1">Forgot password?</Typography>
            <Typography>
              No worries, we'll send you reset instructions.
            </Typography>
          </Box>
          <Box width="100%" textAlign="left">
            <form noValidate spellCheck={false} onSubmit={handleSubmit}>
              <Field
                type="email"
                id="forgot-password-email-input"
                label="Email"
                isRequired={true}
                placeholder="Enter your email"
                value={form.email}
                onChange={handleChange}
                error={errors.email}
              />
              <ButtonSpinner
                disabled={errors.email !== undefined}
                onClick={handleSubmit}
                isLoading={isLoading}
                level="primary"
                label="Send instructions"
                sx={{
                  width: "100%",
                  fontWeight: 400,
                  mt: theme.gap.mlplus,
                }}
              />
            </form>
          </Box>
        </Stack>
      </Stack>
      <Box textAlign="center" p={theme.gap.large}>
        <Typography display="inline-block">Go back to —</Typography>
        <Typography
          component="span"
          ml={theme.gap.xs}
          onClick={handleNavigate}
          sx={{ userSelect: "none" }}
        >
          Log In
        </Typography>
      </Box>
    </Stack>
  );
};

export default ForgotPassword;