// Configuration
// ---------------------------------------------------------------------------------
const config = {
    logoSrc: 'img/logo.png',            // Path to the logo image
    logoHeight: 50,                     // Logo height
    backgroundColor: '#090909',         // Canvas background color
    lineColor: '#159262',               // Default dashed line color
    lineThickness: 3,                   // Dashed line thickness
    randomizeYellowLines: true,         // Enable or disable random yellow lines
    yellowLineColor: '#9d921d',         // Yellow line color
    avatarBackgroundColor: '#090909',   // Background color behind the avatar
    borderThickness: 5,                 // Border thickness around avatars
    borderColor: '#1bec99',             // Border color around avatars
    urlText: '[ Create your own at ccc.cyber.to ]', // Text to display on the canvas
    urlFont: '16px monospace',          // Font for URL text
    urlColor: '#159262',                // URL text color
    avatarScale: 75,                    // Avatar scale percentage
    drawMazeBackground: true,           // Whether to draw a random maze background
    mazeColor: '#05130f',               // Color of the maze lines
    mazeThickness: 2,                   // Thickness of the maze lines
    drawRedLine: true,                  // Enable or disable the red line
    redLineColor: '#9B283C',            // Red line color
    consoleLogging: false,              // Enable or disable console logging
};
// ---------------------------------------------------------------------------------

// Converts degrees to radians
const toRad = (x) => {
    if (config.consoleLogging) console.log('Function call: toRad');
    return x * (Math.PI / 180);
};

const dist = [200, 330, 450]; // Distance of each user layer from the center
const numb = [8, 15, 26]; // Number of users in each layer
const radius = [64, 58, 50]; // Radius of avatars in each layer
let userNum = 0; // Counter for the number of users rendered
let remainingImg = 0; // Counter for remaining images to load
let totalImg = 0; // Total images to load

function render(users, selfUser) {
    if (config.consoleLogging) console.log('Function call: render');
    userNum = 0;
    remainingImg = 0;

    // Get canvas element
    const canvas = document.getElementById("canvas");
    if (!canvas) return;
    const ctx = canvas.getContext("2d"); // Get canvas context

    const width = canvas.width;
    const height = canvas.height;

    // Draw maze if enabled
    if (config.drawMazeBackground) {
        drawMazeBackground(ctx, width, height);
    }

    // Configure canvas background
    ctx.fillStyle = config.backgroundColor;
    ctx.globalCompositeOperation = 'destination-over';
    ctx.fillRect(0, 0, width, height);
    ctx.globalCompositeOperation = 'source-over'; 

    const userPositions = [];
    const tasks = [];
    const mainAvatarRadius = 110 * (config.avatarScale / 100); // Scale main avatar

    totalImg += 1;
    remainingImg += 1;
    loadImage(
        ctx,
        selfUser.avatar,
        (width / 2) - mainAvatarRadius,
        (height / 2) - mainAvatarRadius,
        mainAvatarRadius,
        null, 
        tasks
    );

    // Position and render user avatars
    for (let layerIndex = 0; layerIndex < 3; layerIndex++) {
        const angleSize = 360 / numb[layerIndex];

        for (let i = 0; i < numb[layerIndex]; i++) {
            if (userNum >= users.length) break;

            totalImg += 1;
            remainingImg += 1;

            const offset = layerIndex * 30;
            const r = toRad(i * angleSize + offset);

            const centerX = Math.cos(r) * dist[layerIndex] + width / 2;
            const centerY = Math.sin(r) * dist[layerIndex] + height / 2;
            userPositions.push({ x: centerX, y: centerY });

            // Render connecting lines
            ctx.beginPath();
            ctx.setLineDash([10, 3]);
            ctx.moveTo(width / 2, height / 2);
            ctx.lineTo(centerX, centerY);
            ctx.strokeStyle = config.lineColor;
            ctx.lineWidth = config.lineThickness;
            ctx.stroke();
            ctx.setLineDash([]);

            loadImage(
                ctx,
                users[userNum].avatar,
                centerX - radius[layerIndex] * (config.avatarScale / 100),
                centerY - radius[layerIndex] * (config.avatarScale / 100),
                radius[layerIndex] * (config.avatarScale / 100),
                null,
                tasks
            );

            userNum++;
        }
    }

    // Draw random yellow lines if enabled
    if (config.randomizeYellowLines) {
        randomizeYellowLines(ctx, userPositions, 10); 
    }

    // Draw red line if enabled
    if (config.drawRedLine) {
        drawRedLine(ctx, width, height, userPositions);
    }

    const logo = new Image();
    logo.onload = function () {
        // Load and draw logo
        const aspectRatio = logo.width / logo.height;
        const logoWidth = config.logoHeight * aspectRatio;
        ctx.drawImage(logo, 10, 10, logoWidth, config.logoHeight);
    };
    logo.src = config.logoSrc;

    // Draw URL text
    ctx.font = config.urlFont;
    ctx.fillStyle = config.urlColor;
    const textWidth = ctx.measureText(config.urlText).width;
    const textXPosition = width - textWidth - 10; 
    const textYPosition = height - 10; 

    ctx.fillText(config.urlText, textXPosition, textYPosition);
}

// Draws a maze background
function drawMazeBackground(ctx, width, height) {
    if (config.consoleLogging) console.log('Function call: drawMazeBackground');
    const cellSize = 20;
    ctx.strokeStyle = config.mazeColor;
    ctx.lineWidth = config.mazeThickness;
    for (let y = 0; y < height; y += cellSize) {
        for (let x = 0; x < width; x += cellSize) {
            if (Math.random() > 0.5) {
                ctx.beginPath();
                ctx.moveTo(x, y);
                ctx.lineTo(x + cellSize, y + cellSize);
                ctx.stroke();
            } else {
                ctx.beginPath();
                ctx.moveTo(x + cellSize, y);
                ctx.lineTo(x, y + cellSize);
                ctx.stroke();
            }
        }
    }
}

// Draw random yellow lines
function randomizeYellowLines(ctx, userPositions, maxLines) {
    if (config.consoleLogging) console.log('Function call: randomizeYellowLines');
    const numberOfLines = Math.min(maxLines, Math.floor(Math.random() * userPositions.length));

    for (let i = 0; i < numberOfLines; i++) {
        const index1 = Math.floor(Math.random() * userPositions.length);
        let index2;
        do {
            index2 = Math.floor(Math.random() * userPositions.length);
        } while (index2 === index1);

        const startPos = userPositions[index1];
        const endPos = userPositions[index2];

        ctx.beginPath();
        ctx.setLineDash([10, 3]);
        ctx.moveTo(startPos.x, startPos.y);
        ctx.lineTo(endPos.x, endPos.y);
        ctx.strokeStyle = config.yellowLineColor;
        ctx.lineWidth = config.lineThickness;
        ctx.stroke();
        ctx.setLineDash([]);
    }
}

// Draw a random red line
function drawRedLine(ctx, width, height, userPositions) {
    if (config.consoleLogging) console.log('Function call: drawRedLine');
    if (userPositions.length === 0) return; 

    const selectedPosition = userPositions[Math.floor(Math.random() * userPositions.length)];
    
    ctx.beginPath();
    ctx.setLineDash([10, 3]); 
    ctx.moveTo(width / 2, height / 2);
    ctx.lineTo(selectedPosition.x, selectedPosition.y);
    ctx.strokeStyle = config.redLineColor;
    ctx.lineWidth = config.lineThickness;
    ctx.stroke();
    ctx.setLineDash([]); 
}

// Load and draw user images
function loadImage(ctx, url, x, y, r, name, tasks) {
    if (config.consoleLogging) console.log('Function call: loadImage');
    let progress = document.getElementById("outInfo");
    if (!progress) return;

    tasks.push(() => { /* No text addition here */ });

    // Decrement image counter
    const decrementRemaining = () => {
        remainingImg -= 1;
        progress.innerText = `Loading avatars: ${totalImg - remainingImg}/${totalImg}`;

        if (remainingImg <= 0) {
            progress.innerText = "";
            tasks.forEach((task) => task());
        }
    };

    const img = new Image();

    // Handle image loading errors
    const drawImageWithFallback = (imageSrc) => {
        img.onload = function() {
            ctx.save();
            ctx.beginPath();
            ctx.arc(x + r, y + r, r, 0, Math.PI * 2, true);
            ctx.closePath();
            ctx.clip();

            ctx.fillStyle = config.avatarBackgroundColor;
            ctx.beginPath();
            ctx.arc(x + r, y + r, r, 0, Math.PI * 2, true);
            ctx.fill();
            ctx.closePath();

            ctx.drawImage(img, x, y, r * 2, r * 2);

            ctx.beginPath();
            ctx.arc(x + r, y + r, r, 0, Math.PI * 2, true);
            ctx.lineWidth = config.borderThickness;
            ctx.strokeStyle = config.borderColor;
            ctx.stroke();
            ctx.closePath();

            ctx.restore();

            decrementRemaining();
        };

        img.onerror = function() {
            console.error(`IMG Error: ${imageSrc}`);
            if (imageSrc !== 'img/placeholder.png') {
                drawImageWithFallback('img/placeholder.png');
            } else {
                decrementRemaining();
            }
        };

        img.src = imageSrc;
    };

    drawImageWithFallback(url);
}