const express = require("express");
const cors = require("cors");
const { createCanvas, registerFont } = require("canvas");
const path = require("path");
const fs = require("fs");
const app = express();

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

// Create fonts directory if it doesn't exist
const fontsDir = path.join(__dirname, "fonts");
if (!fs.existsSync(fontsDir)) {
  fs.mkdirSync(fontsDir);
}

// Store available fonts and their variations
const availableFonts = new Map();

function initializeFonts() {
  if (!fs.existsSync(fontsDir)) {
    console.log(
      "Created fonts directory. Please add font files (.ttf or .otf) to the fonts folder."
    );
    return;
  }

  const fontFiles = fs
    .readdirSync(fontsDir)
    .filter(
      (file) =>
        file.toLowerCase().endsWith(".ttf") ||
        file.toLowerCase().endsWith(".otf")
    );

  fontFiles.forEach((file) => {
    const fontPath = path.join(fontsDir, file);
    const fontName = file.replace(/\.(ttf|otf)$/i, "");

    // Parse font variations (Regular, Bold, Italic, etc.)
    let weight = "normal";
    let style = "normal";

    const lowerFontName = fontName.toLowerCase();
    if (lowerFontName.includes("bold")) weight = "bold";
    if (lowerFontName.includes("light")) weight = "light";
    if (lowerFontName.includes("medium")) weight = "medium";
    if (lowerFontName.includes("italic")) style = "italic";

    // Register font with canvas
    registerFont(fontPath, {
      family: fontName.split("-")[0], // Get base font name
      weight,
      style,
    });

    // Store font info
    const familyName = fontName.split("-")[0];
    if (!availableFonts.has(familyName)) {
      availableFonts.set(familyName, []);
    }
    availableFonts.get(familyName).push({
      fullName: fontName,
      weight,
      style,
    });
  });

  console.log("Available font families:", Array.from(availableFonts.keys()));
}

// Initialize fonts
initializeFonts();

// Store requests history
let requestsHistory = [];

function generateQuoteImage(ctx, canvas, data) {
  const {
    text,
    author,
    bgColor,
    barColor,
    textColor,
    authorColor,
    quoteFontFamily,
    quoteFontWeight,
    quoteFontStyle,
    authorFontFamily,
    authorFontWeight,
    authorFontStyle,
    barWidth = 4,
  } = data;

  // Constants for layout
  const margin = 80;
  const quoteMarkSize = 120;
  const padding = 30;
  const lineHeight = 50;

  // Clear canvas
  ctx.fillStyle = bgColor;
  ctx.fillRect(0, 0, canvas.width, canvas.height);

  // Draw bars
  ctx.fillStyle = barColor;
  ctx.fillRect(margin, margin, barWidth, canvas.height - margin * 2);
  ctx.fillRect(
    canvas.width - margin - barWidth,
    margin,
    barWidth,
    canvas.height - margin * 2
  );

  // Set up quote font
  ctx.fillStyle = barColor;
  const quoteMarkFont = [];
  if (quoteFontStyle === "italic") quoteMarkFont.push("italic");
  quoteMarkFont.push(quoteFontWeight);
  quoteMarkFont.push(`${quoteMarkSize}px`);
  quoteMarkFont.push(`"${quoteFontFamily}"`);
  ctx.font = quoteMarkFont.join(" ");
  ctx.textBaseline = "top";

  // Calculate quote mark metrics
  const quoteMarkWidth = ctx.measureText('"').width;
  const textStartX = margin + barWidth + padding + quoteMarkWidth + padding;
  const textEndX = canvas.width - margin - barWidth - padding * 2;
  const maxWidth = textEndX - textStartX;

  // Set up quote text font
  ctx.fillStyle = textColor;
  const quoteFont = [];
  if (quoteFontStyle === "italic") quoteFont.push("italic");
  quoteFont.push(quoteFontWeight);
  quoteFont.push("36px");
  quoteFont.push(`"${quoteFontFamily}"`);
  ctx.font = quoteFont.join(" ");

  // Word wrap text
  const words = text.split(" ");
  const lines = [];
  let currentLine = "";

  for (let word of words) {
    const testLine = currentLine + (currentLine ? " " : "") + word;
    const metrics = ctx.measureText(testLine);

    if (metrics.width > maxWidth) {
      if (currentLine) {
        lines.push(currentLine);
        currentLine = word;
      } else {
        currentLine = word;
      }
    } else {
      currentLine = testLine;
    }
  }
  if (currentLine) {
    lines.push(currentLine);
  }

  // Calculate total height of text block
  const totalTextHeight = lines.length * lineHeight;
  const authorHeight = 60; // Space reserved for author
  const availableHeight = canvas.height - margin * 2;

  // Calculate starting Y position to center text block
  let startY =
    margin + (availableHeight - (totalTextHeight + authorHeight)) / 2;

  // Draw quote mark at the same vertical position as first line
  ctx.fillStyle = barColor;
  ctx.font = quoteMarkFont.join(" ");
  ctx.fillText('"', margin + barWidth + padding, startY);

  // Draw quote lines
  ctx.fillStyle = textColor;
  ctx.font = quoteFont.join(" ");
  lines.forEach((line, index) => {
    ctx.fillText(line.trim(), textStartX, startY + index * lineHeight);
  });

  // Draw author below the quote
  ctx.fillStyle = authorColor;
  const authorFont = [];
  if (authorFontStyle === "italic") authorFont.push("italic");
  authorFont.push(authorFontWeight);
  authorFont.push("28px");
  authorFont.push(`"${authorFontFamily}"`);
  ctx.font = authorFont.join(" ");

  // Ensure author doesn't overflow
  let authorText = `- ${author}`;
  let authorMetrics = ctx.measureText(authorText);
  if (authorMetrics.width > maxWidth) {
    const ellipsis = "...";
    while (authorMetrics.width > maxWidth && author.length > 0) {
      author = author.slice(0, -1);
      authorText = `- ${author}${ellipsis}`;
      authorMetrics = ctx.measureText(authorText);
    }
  }

  // Position author text below quote with spacing
  const authorY = startY + totalTextHeight + 40;
  ctx.fillText(authorText, textStartX, authorY);
}

// API Endpoints
app.get("/api/fonts", (req, res) => {
  const fontDetails = Array.from(availableFonts.entries()).map(
    ([family, variations]) => ({
      family,
      variations: variations.map((v) => ({
        weight: v.weight,
        style: v.style,
        fullName: v.fullName,
      })),
    })
  );
  res.json(fontDetails);
});

app.post("/api/generate-quote", (req, res) => {
  try {
    const data = req.body;

    // Validate fonts exist
    if (!availableFonts.has(data.quoteFontFamily)) {
      throw new Error("Selected quote font is not available");
    }
    if (!availableFonts.has(data.authorFontFamily)) {
      throw new Error("Selected author font is not available");
    }

    // Store request
    requestsHistory.unshift({
      timestamp: new Date(),
      request: data,
    });

    // Keep only last 10 requests
    requestsHistory = requestsHistory.slice(0, 10);

    // Create canvas
    const canvas = createCanvas(1200, 675); // 16:9 ratio
    const ctx = canvas.getContext("2d");

    // Generate quote image
    generateQuoteImage(ctx, canvas, data);

    // Send response
    res.json({
      success: true,
      imageUrl: canvas.toDataURL(),
      timestamp: new Date().toISOString(),
    });
  } catch (error) {
    console.error("Error generating quote:", error);
    res.status(500).json({
      success: false,
      error: error.message,
    });
  }
});

app.get("/api/requests-history", (req, res) => {
  res.json(requestsHistory);
});

// Start server
const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
  console.log(`View the application at http://localhost:${PORT}`);
  console.log("Available fonts:", Array.from(availableFonts.keys()));
});