import { GlobalFonts, createCanvas, loadImage } from '@napi-rs/canvas';
import path from 'path';

// Register Fonts (same as studentID.ts)
const fontDir = path.join(process.cwd(), 'src', 'assets', 'fonts');
GlobalFonts.registerFromPath(path.join(fontDir, 'IBMPlexSansCondensed-SemiBold.ttf'), 'IBMPlexSansCondensed-SemiBold');
GlobalFonts.registerFromPath(path.join(fontDir, 'IBMPlexMono-Bold.ttf'), 'IBMPlexMono-Bold');

export async function generateLootdropCard(amount: number, currency: string): Promise<Buffer> {
    const templatePath = path.join(process.cwd(), 'src', 'assets', 'graphics', 'lootdrop', 'template.png');
    const template = await loadImage(templatePath);

    const canvas = createCanvas(template.width, template.height);
    const ctx = canvas.getContext('2d');

    // Draw Template
    ctx.drawImage(template, 0, 0);

    // Draw Lootdrop Text (Title-ish)
    ctx.save();
    ctx.font = '48px IBMPlexSansCondensed-SemiBold';
    ctx.fillStyle = '#FFFFFF';
    ctx.textAlign = 'center';
    ctx.shadowBlur = 10;
    ctx.shadowColor = 'rgba(255, 255, 255, 0.5)';
    // Center of lower half (512-1024) is roughly 768
    ctx.fillText('A STAR IS FALLING', canvas.width / 2, 660);
    ctx.restore();

    // Draw Reward Amount
    ctx.save();
    ctx.font = '72px IBMPlexMono-Bold';
    ctx.fillStyle = '#DAC7A1';
    ctx.textAlign = 'center';
    //ctx.shadowBlur = 15;
    //ctx.shadowColor = 'rgba(255, 215, 0, 0.8)';
    ctx.fillText(`${amount} ${currency}`, canvas.width / 2, 760); // Below title
    ctx.restore();

    // Crop the image by 64px on all sides
    const croppedWidth = template.width - 128;
    const croppedHeight = template.height - 128;
    const croppedCanvas = createCanvas(croppedWidth, croppedHeight);
    const croppedCtx = croppedCanvas.getContext('2d');

    // Draw the original canvas onto the cropped canvas, shifted by -64
    croppedCtx.drawImage(canvas, -64, -64);

    return croppedCanvas.toBuffer('image/png');
}

export async function generateClaimedLootdropCard(amount: number, currency: string, username: string, avatarUrl: string): Promise<Buffer> {
    const templatePath = path.join(process.cwd(), 'src', 'assets', 'graphics', 'lootdrop', 'template.png');
    const template = await loadImage(templatePath);

    const canvas = createCanvas(template.width, template.height);
    const ctx = canvas.getContext('2d');

    // Draw Template
    ctx.drawImage(template, 0, 0);

    // Add a colored overlay to signify "claimed"
    ctx.fillStyle = 'rgba(10, 10, 20, 0.85)';
    ctx.fillRect(0, 0, canvas.width, canvas.height);

    // Draw Claimed Text (Title-ish)
    ctx.save();
    ctx.font = '48px IBMPlexSansCondensed-SemiBold';
    ctx.fillStyle = '#FFFFFF';
    ctx.textAlign = 'center';
    ctx.shadowBlur = 10;
    ctx.shadowColor = 'rgba(255, 255, 255, 0.5)';
    ctx.fillText('STAR CLAIMED', canvas.width / 2, 660);
    ctx.restore();

    // Draw "by username" with Avatar
    ctx.save();
    ctx.font = '36px IBMPlexSansCondensed-SemiBold';
    ctx.fillStyle = '#AAAAAA';

    // Calculate layout for centering Group (Avatar + Text)
    const text = `by ${username}`;
    const textMetrics = ctx.measureText(text);
    const textWidth = textMetrics.width;
    const avatarSize = 50;
    const gap = 15;
    const totalWidth = avatarSize + gap + textWidth;

    const startX = (canvas.width - totalWidth) / 2;
    const baselineY = 830;

    // Draw Avatar
    try {
        const avatar = await loadImage(avatarUrl);
        ctx.save();
        ctx.beginPath();
        // Center avatar vertically relative to text roughly (baseline - ~half cap height)
        // 36px text ~ 27px cap height. Center roughly at baselineY - 14
        const avatarCenterY = baselineY - 14;
        ctx.arc(startX + avatarSize / 2, avatarCenterY, avatarSize / 2, 0, Math.PI * 2);
        ctx.closePath();
        ctx.clip();
        ctx.drawImage(avatar, startX, avatarCenterY - avatarSize / 2, avatarSize, avatarSize);
        ctx.restore();
    } catch (e) {
        // Fallback if avatar fails to load, just don't draw it (or maybe shift text?)
        // For now, let's just proceed, the text will be off-center if avatar is missing but that's acceptable edge case
        console.error("Failed to load avatar", e);
    }

    // Draw Text
    ctx.textAlign = 'left';
    ctx.fillText(text, startX + avatarSize + gap, baselineY);
    ctx.restore();

    ctx.save();
    ctx.font = '72px IBMPlexMono-Bold'; // Match Amount size
    ctx.fillStyle = '#E6D2B5'; // Lighter gold/beige for better contrast
    ctx.textAlign = 'center';
    ctx.shadowBlur = 10;
    ctx.shadowColor = 'rgba(0, 0, 0, 0.8)'; // Dark shadow for contrast
    ctx.fillText(`${amount} ${currency}`, canvas.width / 2, 760); // Same position as Unclaimed Amount
    ctx.restore();

    // Crop the image by 64px on all sides
    const croppedWidth = template.width - 128;
    const croppedHeight = template.height - 128;
    const croppedCanvas = createCanvas(croppedWidth, croppedHeight);
    const croppedCtx = croppedCanvas.getContext('2d');

    // Draw the original canvas onto the cropped canvas, shifted by -64
    croppedCtx.drawImage(canvas, -64, -64);

    return croppedCanvas.toBuffer('image/png');
}