import { FormEvent, useRef, useState } from "react"
import { BASE } from "../Constants.ts"
import { fetchAPI, redirect } from "../Fetcher.ts"
import { Failure } from "../api/failure.ts"
import { getSession, saveSession } from "../api/session.ts"
import "../style/form.css"

export default function LoginApp() {
    const [errors, setErrors] = useState<Failure[]>([])

    const emailRef = useRef<HTMLInputElement>(null)
    const passwordRef = useRef<HTMLInputElement>(null)

    async function handleSubmit(e: FormEvent) {
        e.preventDefault()

        const email = emailRef.current!.value
        const password = passwordRef.current!.value

        const response = await fetchAPI(
            "auth/token",
            { email, password },
            "POST",
            false,
        )

        if (response.ok) {
            const session = getSession()
            const { token, expirationDate } = await response.json()
            saveSession({ ...session, auth: { token, expirationDate } })
            redirect(session.urlTarget ?? "/")
            return
        }

        // if unauthorized :
        if (response.status === 401) {
            setErrors([
                {
                    type: "Non autorisé",
                    messages: [
                        "L'adresse email ou le mot de passe sont invalide.",
                    ],
                },
            ])
            return
        }

        try {
            const failures = await response.json()
            setErrors(
                Object.entries<string[]>(failures).map(([type, messages]) => ({
                    type,
                    messages,
                })),
            )
        } catch (e) {
            setErrors([
                {
                    type: "internal error",
                    messages: ["an internal error occurred."],
                },
            ])
        }
    }

    return (
        <div className="container">
            <center>
                <h2>Se connecter</h2>
            </center>

            {errors.map(({ type, messages }) =>
                messages.map((message) => (
                    <p key={type} style={{ color: "red" }}>
                        {type} : {message}
                    </p>
                )),
            )}

            <form onSubmit={handleSubmit}>
                <div className="form-group">
                    <label htmlFor="email">Email :</label>
                    <input
                        ref={emailRef}
                        type="text"
                        id="email"
                        name="email"
                        required
                    />

                    <label htmlFor="password">Mot de passe :</label>
                    <input
                        ref={passwordRef}
                        type="password"
                        id="password"
                        name="password"
                        required
                    />

                    <a href={BASE + "/register"} className="inscr">
                        Vous n'avez pas de compte ?
                    </a>
                    <br />
                    <br />
                    <div id="buttons">
                        <input
                            className="button"
                            type="submit"
                            value="Se connecter"
                        />
                    </div>
                </div>
            </form>
        </div>
    )
}