code.js

(() => {
    'use strict';
    let arm9FileName = null;
    let armDataView = null;
    const ARM_OFFSETS = {
        "Rain Slot": 0x082B80,
        "Snow Slot": 0x082B78,
        "Flashing Camera Slot": 0x08BBC0
    };
    const COURSE_REFERENCE = [
        "1 - gcn yoshi circuit", "2 - old_mario_gc", "3 - luigi_course", "4 - dokan_course",
        "5 - test1_course", "6 - donkey_course", "7 - wario_course", "8 - nokonoko_course",
        "9 - gcn baby park", "10 - snes mario circuit 1", "11 - n64 moo mario farm",
        "12 - gba bowser castle 2", "13 - gba peach circuit", "14 - gcn luigi circuit",
        "15 - snes koopa beach 2", "16 - n64 frappe snowland (snow default)", "17 - tick-tock clock",
        "18 - luigi's mansion", "19 - airship fortress", "20 - figure-8 circuit",
        "21 - test_circle", "22 - yoshi falls", "23 - n64 banshee boardwalk", "24 - shroom ridge",
        "25 - mario circuit", "26 - peach gardens", "27 - desert hills", "28 - delfino square",
        "29 - rainbow road", "30 - dk pass", "31 - cheep cheep beach", "32 - bowser castle",
        "33 - waluigi pinball", "34 - wario stadium (flashing lights default)", "35 - snes donut plains 1",
        "36 - n64 choco mountain", "37 - gba luigi circuit (rain default)", "38 - gcn mushroom bridge",
        "39 - snes choco island 2", "40 - gba sky garden", "41 - mini_block_course", "42 - block fort",
        "43 - pipe plaza", "44 - nintendo ds", "45 - twilight house", "46 - palm shore",
        "47 - tart top", "48 - mr_stage1", "49 - mr_stage2", "50 - mr_stage3",
        "51 - mr_stage4", "52 - award", "53 - staffroll", "54 - staffrolltrue"
    ];
    const elements = {
        fileInput: document.getElementById('fileInput'),
        btnOpen: document.getElementById('btnOpen'),
        btnSave: document.getElementById('btnSave'),
        btnHelp: document.getElementById('btnHelp'),
        btnRepo: document.getElementById('btnRepo'),
        trackList: document.getElementById('trackList'),
        courseList: document.getElementById('courseList'),
        mainContent: document.getElementById('mainContent')
    };
    function init() {
        populateCourseReference();
        bindEvents();
    }
    function bindEvents() {
        elements.btnOpen.addEventListener('click', () => elements.fileInput.click());
        elements.btnSave.addEventListener('click', saveFile);
        elements.btnHelp.addEventListener('click', showHelp);
        elements.btnRepo.addEventListener('click', () => window.open('https://github.com/LandonAndEmma/MKDS-ARM9-Slots-Swapper', '_blank'));
        elements.fileInput.addEventListener('change', handleFileOpen);
        elements.trackList.addEventListener('change', handleSlotSelection);
    }
    function populateCourseReference() {
        const fragment = document.createDocumentFragment();
        COURSE_REFERENCE.forEach(course => {
            const li = document.createElement('li');
            li.textContent = course;
            fragment.appendChild(li);
        });
        elements.courseList.appendChild(fragment);
    }
    function refreshTrackList() {
        elements.trackList.innerHTML = '';
        for (const [trackName, offset] of Object.entries(ARM_OFFSETS)) {
            const currentVal = armDataView ? armDataView[offset] : '?';
            const option = document.createElement('option');
            option.value = offset;
            option.text = `${trackName} (Current ID: ${currentVal})`;
            elements.trackList.add(option);
        }
    }
    async function handleFileOpen(event) {
        const file = event.target.files[0];
        if (!file) return;
        arm9FileName = file.name;
        try {
            const arrayBuffer = await file.arrayBuffer();
            armDataView = new Uint8Array(arrayBuffer);
            refreshTrackList();
            elements.btnSave.disabled = false;
            elements.mainContent.classList.remove('hidden');
        } catch (error) {
            alert('Failed to read file: ' + error.message);
        }
        event.target.value = '';
    }
    function handleSlotSelection(event) {
        const selectedOption = event.target.options[event.target.selectedIndex];
        if (!selectedOption) return;
        const offset = parseInt(selectedOption.value, 10);
        const trackName = Object.keys(ARM_OFFSETS).find(key => ARM_OFFSETS[key] === offset);
        const currentVal = armDataView[offset];
        const input = prompt(`Enter new course ID (1-54) for ${trackName}:`, currentVal);
        if (input !== null) {
            const intValue = parseInt(input, 10);
            if (!isNaN(intValue) && intValue >= 1 && intValue <= 54) {
                armDataView[offset] = intValue;
                alert(`Success! ${trackName} updated to ID: ${intValue}`);
            } else {
                alert('Invalid input. Course ID must be a number between 1 and 54.');
            }
        }
        refreshTrackList();
        elements.trackList.selectedIndex = -1;
    }
    function saveFile() {
        if (!armDataView || !arm9FileName) return;
        const blob = new Blob([armDataView], { type: 'application/octet-stream' });
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = arm9FileName;
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        URL.revokeObjectURL(url);
    }
    function showHelp() {
        alert(
            "MKDS ARM9 Slot Swapper\n\n" +
            "1. Click 'Open arm9.bin' and select your file.\n" +
            "2. Click a slot in the dropdown list to edit its course ID.\n" +
            "3. Enter a valid ID (1-54) based on the provided reference list.\n" +
            "4. Click 'Save' to download your modified file.\n\n" +
            "Documentation: Southport\nCode by Landon & Emma"
        );
    }
    init();
})();