const STATE = {
    id: 0,
    chat_id: "",
    observer: null,
    is_loading: false,
    stream_element: null,
    last_message_time: 0,
    last_read_receipt_load: 0,
};

function create_streamer(chat_id, hook_element) {
    STATE.chat_id = chat_id;
    STATE.stream_element = hook_element.parentElement;

    STATE.observer = new IntersectionObserver(
        () => {
            load_messages();
        },
        {
            root: STATE.stream_element,
            rootMargin: "0px",
            scrollMargin: "0px",
            threshold: 1.0,
        },
    );

    STATE.observer.observe(hook_element);
    read_receipt();
}

function load_messages() {
    if (STATE.is_loading) {
        return;
    }

    STATE.is_loading = true;
    STATE.id += 1;

    fetch(
        `/chats/_templates/chat/${STATE.chat_id}/messages/before/${STATE.last_message_time}?use_id=${STATE.id}`,
    )
        .then((res) => res.text())
        .then((res) => {
            setTimeout(() => {
                STATE.is_loading = false;
            }, 2000);

            STATE.stream_element.innerHTML += res;
            STATE.last_message_time = Number.parseInt(
                document
                    .getElementById(`msgs_data_${STATE.id}`)
                    .getAttribute("data-first-message-time"),
            );

            // STATE.stream_element.scrollTo(0, STATE.stream_element.scrollHeight);

            if (document.getElementById(`msgs_quit_${STATE.id}`)) {
                STATE.observer.disconnect();
                console.log("quit");
            } else {
                STATE.observer.unobserve(
                    STATE.stream_element.querySelector(
                        "[ui_ident=data_marker]",
                    ),
                );

                const element = document.createElement("div");
                element.setAttribute("ui_ident", "data_marker");
                STATE.stream_element.append(element);
                STATE.observer.observe(element);
            }
        });
}

function render_message(id) {
    STATE.is_loading = true;
    fetch(`/chats/_templates/message/${id}`)
        .then((res) => res.text())
        .then((res) => {
            STATE.is_loading = false;
            STATE.stream_element.innerHTML = `${res}${STATE.stream_element.innerHTML}`;
            mark_message_read();
            STATE.stream_element.scrollTo(0, STATE.stream_element.scrollHeight);
        });
}

function sock_con() {
    const socket = new WebSocket(
        `//${window.location.origin.split("//")[1]}/api/v1/chats/${STATE.chat_id}/_connect`,
    );

    socket.addEventListener("message", async (event) => {
        if (event.data === "Ping") {
            return socket.send("Pong");
        }

        const msg = JSON.parse(event.data);

        if (msg.method === "MessageCreate") {
            render_message(msg.body);
        } else if (msg.method === "MessageDelete") {
            if (document.getElementById(`message_${msg.body}`)) {
                document.getElementById(`message_${msg.body}`).remove();
            }
        } else if (msg.method === "ReadReceipt") {
            setTimeout(() => {
                read_receipt();
            }, 1500);
        }
    });
}

function create_message(e) {
    e.preventDefault();

    const body = new FormData();

    body.append(
        "body",
        JSON.stringify({
            content: e.target.content.value,
        }),
    );

    fetch(`/api/v1/messages/${STATE.chat_id}`, { method: "POST", body })
        .then((res) => res.json())
        .then((res) => {
            if (res.ok) {
                e.target.reset();
            } else {
                show_message(res.message, res.ok);
            }
        });
}

function mark_message_read() {
    fetch(`/api/v1/chats/${STATE.chat_id}/read_message`, {
        method: "POST",
    })
        .then((res) => res.json())
        .then((res) => {
            if (!res.ok) {
                show_message(res.message, res.ok);
            }
        });
}

function read_receipt() {
    if (new Date().getTime() - STATE.last_read_receipt_load < 150) {
        console.log("too soon");
        return;
    }

    STATE.last_read_receipt_load = new Date().getTime();

    if (document.getElementById("delivered_read_status")) {
        document.getElementById("delivered_read_status").remove();
    }

    fetch(`/chats/_templates/chat/${STATE.chat_id}/read_receipt`)
        .then((res) => res.text())
        .then((res) => {
            STATE.stream_element.innerHTML = `${res}${STATE.stream_element.innerHTML}`;
        });
}

function delete_message(id) {
    if (!confirm("Are you sure you want to do this?")) {
        return;
    }

    fetch(`/api/v1/messages/${id}`, {
        method: "DELETE",
    })
        .then((res) => res.json())
        .then((res) => {
            if (!res.ok) {
                show_message(res.message, res.ok);
            }
        });
}