import React, { useState, useEffect, useRef, FormEvent, ChangeEvent } from 'react'
import { useDispatch } from 'react-redux';
import { useNavigate } from 'react-router-dom'
import { setUserSlice } from '../store/userSlice';
import DocVaLogoLight from '../../assets/logo-colored-vertical.svg'
import DocVaLogoDark from '../../assets/logo-white-vertical.svg'
import { useTheme } from '../helper/ThemeToggle';
import { Eye, EyeOff, KeyRound, Mail } from 'lucide-react';

const Login = () => {
  const { theme, setTheme } = useTheme();

  const inputRef = useRef<HTMLFormElement | null>(null)
  const navigate = useNavigate()
  const dispatch = useDispatch();
  const [errorMessage, setErrorMessage] = useState("")
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [isForgotMode, setIsForgotMode] = useState(false);
  const [loading, setLoading] = useState(false);
  const [showPassword, setShowPassword] = useState(false);

  useEffect(() => {
    document.documentElement.setAttribute("data-theme", theme);
  }, [theme]);

  const logo = theme === "dark" ? DocVaLogoDark : DocVaLogoLight;



  const handleLogin = async (e: FormEvent<HTMLFormElement> | KeyboardEvent) => {
    e.preventDefault()

    if (email === "" || password === "") return
    setLoading(true);
    try {
      const response = await window.electron.login({ email, password });
      console.log(response)
      if (response.success) {
        // setUser(response.user);
        dispatch(setUserSlice({
          id: response.user.id,
          name: response.user.name,
          email: response.user.email,
        }));
        navigate("/")
      }
      else if (response.success == false) {
        console.log(response.error.message)
        setErrorMessage(response.error.message)
      }
    } catch (error) {
      console.log(error)
    } finally {
      setLoading(false);
    }

  }


  const handleForgotPassword = async (e: FormEvent<HTMLFormElement> | KeyboardEvent) => {
    e.preventDefault();
    setLoading(true);
    try {
      const res = await window.electron.forgotPassword(email);
      console.log("Forgot password response:", res);
      alert("Password reset link sent to your email");
      setIsForgotMode(false);
    } catch (error) {
      console.error("Forgot password error:", error);
    } finally {
      setLoading(false);
    }
  };

  // Detect Enter key press
  useEffect(() => {
    const handleEnter = (e: KeyboardEvent) => {
      if (e.key === 'Enter') {
        if (!isForgotMode) {
          handleLogin(e)
        } else {
          handleForgotPassword(e)
        }
      }
    }

    const inputElement = inputRef.current
    inputElement?.addEventListener('keydown', handleEnter)

    return () => inputElement?.removeEventListener('keydown', handleEnter)
  }, [email, password])

  return (
    <>
      <div className="min-h-screen flex items-center justify-center bg-linear-to-br from-primary/10 via-base-200 to-secondary/10 p-4">
        <div className="card w-full max-w-md shadow-2xl bg-base-100 backdrop-blur-sm">
          <div className="card-body">
            <div className="flex justify-center items-center mb-4">
              <div className="avatar placeholder">
                {/* <div className="bg-primary text-primary-content rounded-full w-20 h-20 flex items-center justify-center"> */}
                <img src={logo} className='w-35 h-23' />
                {/* </div> */}
              </div>
            </div>

            <h2 className="text-center text-3xl font-bold mb-2">Welcome Back</h2>
            <p className="text-center text-base-content/60 mb-6">Sign in to Employee Tracker</p>

            <form
              ref={inputRef}
              className="flex flex-col items-center justify-center w-full"
              onSubmit={isForgotMode ? handleForgotPassword : handleLogin}
            >
              <div className="form-control w-90 px-5">
                <label className="label">
                  <span className="label-text font-medium">Email Address</span>
                </label>
                <label className="input input-bordered flex items-center gap-2" tabIndex={0}>
                  {/* <Mail size={18} /> */}
                  <input
                    type="email"
                    name="email"
                    placeholder="you@example.com"
                    className="grow"
                    value={email}
                    onChange={(e) => setEmail(e.target.value)}
                    required
                  />
                </label>
              </div>

              {!isForgotMode && (
                <div className="form-control w-90 px-5 mt-3">
                  <label className="label">
                    <span className="label-text font-medium">Password</span>
                  </label>

                  <label className="input input-bordered flex items-center gap-2" tabIndex={0}>
                    {/* <KeyRound size={18} /> */}

                    <input
                      type={showPassword ? "text" : "password"}
                      name="password"
                      placeholder="Enter your password"
                      className="grow"
                      value={password}
                      onChange={(e) => setPassword(e.target.value)}
                      required
                    />

                    {/* Toggle Icon */}
                    <button
                      type="button"
                      className="cursor-pointer"
                      onClick={() => setShowPassword((prev) => !prev)}
                    >
                      {showPassword ? (
                        <EyeOff size={18} className="opacity-70" />
                      ) : (
                        <Eye size={18} className="opacity-70" />
                      )}
                    </button>
                  </label>
                </div>
              )}


              <div className="form-control w-90 px-5 mt-4">
                <button
                  type="submit"
                  disabled={loading}
                  className="btn btn-primary w-full"
                >
                  {loading
                    ? "Please wait..."
                    : isForgotMode
                      ? "Send Reset Link"
                      : "Login"}
                </button>
              </div>
              <div className="text-center mt-4">
                {isForgotMode ? (
                  <button
                    type="button"
                    onClick={() => setIsForgotMode(false)}
                    className="link link-primary text-sm"
                  >
                    Back to Login
                  </button>
                ) : (
                  <button
                    type="button"
                    onClick={() => setIsForgotMode(true)}
                    className="link link-primary text-sm"
                  >
                    Forgot Password?
                  </button>
                )}
              </div>
              {errorMessage && <span className='text-red-500 font-semibold mt-2'>{errorMessage}...!</span>}
            </form>
          </div>
        </div>
      </div>
    </>
  )
}

export default Login