const express = require("express");
const cors = require("cors");
const { createCanvas } = require("canvas");

const app = express();
app.use(cors());
app.use(express.json());
app.use(express.static("public"));

function generateBratImage(text) {
    const width = 1000;
    const height = 1400;
    const canvas = createCanvas(width, height);
    const ctx = canvas.getContext("2d");

    ctx.fillStyle = "#ffffff";
    ctx.fillRect(0, 0, width, height);

    ctx.fillStyle = "#000000";
    ctx.font = "60px Arial";

    let x = 50;
    let y = 120;

    text.split(" ").forEach((word, i) => {
        // RANDOM JITTER
        const jitterX = Math.random() * 30 - 15;
        const jitterY = Math.random() * 30 - 15;

        // RANDOM LINE BREAK
        if (Math.random() < 0.15) {
            y += 110;
            x = 50;
        }

        ctx.fillText(word, x + jitterX, y + jitterY);

        x += ctx.measureText(word).width + 40;

        // NEW LINE if too long
        if (x > 800) {
            y += 110;
            x = 50;
        }
    });

    return canvas.toBuffer("image/png");
}

app.post("/api/brat", (req, res) => {
    const { text } = req.body;

    if (!text) return res.json({ error: "Masukkan text" });

    const img = generateBratImage(text);

    res.set("Content-Type", "image/png");
    res.send(img);
});

// Home page
app.get("/", (req, res) => {
    res.sendFile(__dirname + "/public/index.html");
});

// HuggingFace uses port 7860
app.listen(7860, () => console.log("Running brat generator on 7860"));