code.js

let ARM9_BIN_PATH = null;
let ARM_VALUES = [];
const ARM_OFFSETS = {
    "Grand Prix Flyover": 0x153171,
    "Grand Prix Flyover (Figure-8 Circuit, GCN Luigi Circuit, Mario Circuit)": 0x153175,
    "Wario Stadium Flyover": 0x153179,
    "Battle Mode Flyover": 0x153181,
    "Boss Intro": 0x153185,
    "Figure-8 Circuit": 0x153189,
    "GCN Yoshi Circuit": 0x153191,
    "Cheep Cheep Beach": 0x153195,
    "Yoshi Falls": 0x153199,
    "Bowser Castle": 0x153201,
    "GBA Sky Garden": 0x153205,
    "Battle Mode": 0x153209,
    "New Reward": 0x153211,
    "Grand Prix Results": 0x153215,
    "Credits (50cc + 100cc)": 0x153219,
    "Wi-Fi Menu": 0x153221,
    "Multiplayer Menu": 0x153225,
    "Records Menu": 0x153229,
    "Game Intro": 0x153231,
    "Singleplayer Menu": 0x153235,
    "Grand Prix Flyover (Waluigi Pinball)": 0x15317D,
    "GCN Luigi Circuit": 0x15318D,
    "GCN Baby Park": 0x15319D,
    "N64 Moo Moo Farm": 0x1531A1,
    "N64 Frappe Snowland": 0x1531A5,
    "Delfino Square": 0x1531A9,
    "Airship Fortress": 0x1531AD,
    "Wario Stadium": 0x1531B1,
    "GCN Mushroom Bridge": 0x1531B5,
    "Peach Gardens": 0x1531B9,
    "Luigi's Mansion": 0x1531BD,
    "SNES Mario Circuit 1": 0x1531C1,
    "SNES Koopa Beach 2": 0x1531C5,
    "SNES Donut Plains 1": 0x1531C9,
    "SNES Choco Island 2": 0x1531CD,
    "GBA Peach Circuit": 0x1531D1,
    "GBA Luigi Circuit": 0x1531D5,
    "Shroom Ridge": 0x1531D9,
    "N64 Choco Mountain": 0x1531DD,
    "N64 Banshee Boardwalk": 0x1531E1,
    "DK Pass": 0x1531E5,
    "Desert Hills": 0x1531E9,
    "Waluigi Pinball": 0x1531ED,
    "Tick Tock Clock": 0x1531F1,
    "Mario Circuit": 0x1531F5,
    "Rainbow Road": 0x1531F9,
    "GBA Bowser Castle 2": 0x1531FD,
    "Boss Battle": 0x15320D,
    "Credits (150cc + Mirror)": 0x15321D
};

function openFile() {
    const fileInput = document.getElementById('fileInput');
    fileInput.click();
}

function readBinaryFile(file) {
    return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onload = () => resolve(new Uint8Array(reader.result));
        reader.onerror = reject;
        reader.readAsArrayBuffer(file);
    });
}

async function saveFile() {
    if (ARM9_BIN_PATH) {
        try {
            const uint8Array = new Uint8Array(ARM_VALUES);
            const blob = new Blob([uint8Array], { type: 'application/octet-stream' });
            const url = window.URL.createObjectURL(blob);

            const a = document.createElement('a');
            a.href = url;
            a.download = ARM9_BIN_PATH;
            document.body.appendChild(a);
            a.click();
            document.body.removeChild(a);
            window.URL.revokeObjectURL(url);
        } catch (error) {
            console.error('Error saving file:', error);
        }
    } else {
        console.error('No file is opened to save.');
    }
}

function openHelp() {
    const helpMessage = `
    This program allows you to edit the music track SEQ IDs in the arm9.bin file of Mario Kart DS.\n\n
    1. To get started, click the open button and select the arm9.bin file you want to edit.\n\n
    2. Once the file is opened, click on a track in the list to change its SEQ ID.\n\n
    3. After making changes, click the save button to save the modified file.\n\n
    Original Code: Ermelber, Yami, MkDasher\n
    Fixed and made into a Web app by Landon & Emma`;
    alert(helpMessage);
}

function openRepository() {
    const repositoryUrl = 'https://github.com/LandonAndEmma/MKDS-ARM9-Music-Editor';
    window.open(repositoryUrl, '_blank');
}

function onListboxSelect() {
    const selectedTrack = trackList.options[trackList.selectedIndex].text;
    if (selectedTrack) {
        openPopup();
    }
}

function refreshListbox() {
    const trackList = document.getElementById('trackList');
    trackList.innerHTML = '';
    for (const [track, offset] of Object.entries(ARM_OFFSETS)) {
        const option = document.createElement('option');
        option.text = track;
        trackList.add(option);
    }
}

async function openPopup() {
    const selectedTrack = trackList.options[trackList.selectedIndex].text;
    const offset = ARM_OFFSETS[selectedTrack];

    const newSeqValue = prompt(`Enter new course value for ${selectedTrack}:`, ARM_VALUES[offset]);
    if (newSeqValue !== null) {
        const intValue = parseInt(newSeqValue);
        if (!isNaN(intValue) && intValue > -1 && intValue < 76) {
            ARM_VALUES[offset] = intValue;
            refreshListbox();
            alert(`SEQ value for ${selectedTrack} changed to ${intValue}`);
        } else {
            alert('Invalid SEQ value. Value must be between 0 and 75.');
        }
    }
}

document.getElementById('fileInput').addEventListener('change', async (event) => {
    const file = event.target.files[0];
    if (file) {
        ARM9_BIN_PATH = file.name;
        const fileContent = await readBinaryFile(file);
        ARM_VALUES = Array.from(fileContent);
        refreshListbox();
    }
});