const $form = document.querySelector(".form")

const $validationBox = document.querySelector("#validationBox")
const $validationMsg = document.querySelector("#validationMsg")

const $successBox = document.querySelector("#successBox")
const $successMsg = document.querySelector("#successMsg")

const showError = (message) => {
    $validationBox.style.display = "block"
    $validationMsg.innerText = message
}

const clearError = () => {
    $validationMsg.innerText = ""
    $validationBox.style.display = "none"
}

const showSuccess = (message) => {
    $successBox.style.display = "block"
    $successMsg.innerText = message
}

const clearSuccess = () => {
    $successMsg.innerText = ""
    $successBox.style.display = "none"
}

document.addEventListener("DOMContentLoaded", (e) => {
    $form.addEventListener("submit", async (e) => {
        e.preventDefault()

        clearError()
        clearSuccess()

        const formData = new FormData($form)
        const data = Object.fromEntries(formData)

        if ([{key: "email", name: "Email"}, {key: "password", name: "Password"}].some(({key, name}) => {
            if (!data[key]) {
                showError(`${name} is required`)
                return true
            }
            return false;
        })) {
            return
        }

        try {
            const response = await fetch("/api/v1/login", {
                method: "POST",
                body: JSON.stringify(data),
                headers: {
                    "Content-Type": "application/json",
                },
            })
            if (response.status != 200) {
                const json = await response.json()
                const text = json.error || "Unexpected error happened"
                showError(`Failed to log into account. ${text[0].toUpperCase() + text.slice(1)}`)
            } else {
                showSuccess("Successfully logged into your account")
                $form.reset()
            }
        } catch(err) {
            showError("Failed to log into account. Unexpected error happened")
        }
    })
})