#!/usr/bin/env node
/**
 * Fetches POE2 trade API data and generates Tesseract user-words and user-patterns
 * files to improve OCR accuracy for tooltip text.
 *
 * Usage: node generate-words.mjs
 * Output: poe2.user-words, poe2.user-patterns (in same directory)
 */

import { writeFileSync } from "fs";
import { dirname, join } from "path";
import { fileURLToPath } from "url";

const __dirname = dirname(fileURLToPath(import.meta.url));
const UA = "OAuth poe2trade/1.0 (contact: poe2trade@users.noreply.github.com)";

async function fetchJson(path) {
  const url = `https://www.pathofexile.com/api/trade2/data/${path}`;
  const res = await fetch(url, { headers: { "User-Agent": UA } });
  if (!res.ok) throw new Error(`${url}: ${res.status}`);
  return res.json();
}

async function main() {
  console.log("Fetching POE2 trade API data...");
  const [items, stats, static_, filters] = await Promise.all([
    fetchJson("items"),
    fetchJson("stats"),
    fetchJson("static"),
    fetchJson("filters"),
  ]);

  const words = new Set();

  // Helper: split text into individual words and add each
  function addWords(text) {
    if (!text) return;
    // Remove # placeholders and special chars, split on whitespace
    const cleaned = text
      .replace(/#/g, "")
      .replace(/[{}()\[\]]/g, "")
      .replace(/[+\-]/g, " ");
    for (const word of cleaned.split(/\s+/)) {
      // Only keep words that are actual words (not numbers, not single chars)
      const trimmed = word.replace(/^[^a-zA-Z]+|[^a-zA-Z]+$/g, "");
      if (trimmed.length >= 2) words.add(trimmed);
    }
  }

  // Helper: add a full phrase (multi-word item name) as-is
  function addPhrase(text) {
    if (!text) return;
    addWords(text);
  }

  // Items: type names (base types like "Tribal Mask", "Leather Vest")
  for (const cat of items.result) {
    addPhrase(cat.label);
    for (const entry of cat.entries) {
      addPhrase(entry.type);
      addPhrase(entry.name);
      addPhrase(entry.text);
    }
  }

  // Stats: mod text like "+#% to Chaos Resistance", "# to maximum Life"
  for (const cat of stats.result) {
    for (const entry of cat.entries) {
      addPhrase(entry.text);
    }
  }

  // Static: currency/fragment names like "Divine Orb", "Scroll of Wisdom"
  for (const cat of static_.result) {
    addPhrase(cat.label);
    for (const entry of cat.entries) {
      addPhrase(entry.text);
    }
  }

  // Filters: filter labels and option texts
  for (const cat of filters.result) {
    addPhrase(cat.title);
    if (cat.filters) {
      for (const f of cat.filters) {
        addPhrase(f.text);
        if (f.option?.options) {
          for (const opt of f.option.options) {
            addPhrase(opt.text);
          }
        }
      }
    }
  }

  // Add common tooltip keywords not in trade API
  const extraWords = [
    // Section headers
    "Quality", "Requires", "Level", "Asking", "Price",
    "Corrupted", "Mirrored", "Unmodifiable",
    "Twice", "Sockets",
    // Attributes
    "Strength", "Dexterity", "Intelligence", "Spirit",
    // Defense types
    "Armour", "Evasion", "Rating", "Energy", "Shield",
    // Damage types
    "Physical", "Elemental", "Lightning", "Cold", "Fire", "Chaos",
    // Common mod words
    "increased", "reduced", "more", "less",
    "added", "converted", "regeneration",
    "maximum", "minimum", "total",
    "Resistance", "Damage", "Speed", "Duration",
    "Critical", "Hit", "Chance", "Multiplier",
    "Attack", "Cast", "Spell", "Minion", "Skill",
    "Mana", "Life", "Rarity",
    // Item classes
    "Helmet", "Gloves", "Boots", "Body", "Belt",
    "Ring", "Amulet", "Shield", "Quiver",
    "Sword", "Axe", "Mace", "Dagger", "Wand", "Staff", "Bow",
    "Sceptre", "Crossbow", "Flail", "Spear",
    // Rarity
    "Normal", "Magic", "Rare", "Unique",
  ];
  for (const w of extraWords) words.add(w);

  // Sort and write user-words
  const sortedWords = [...words].sort((a, b) => a.toLowerCase().localeCompare(b.toLowerCase()));
  const wordsPath = join(__dirname, "poe2.user-words");
  writeFileSync(wordsPath, sortedWords.join("\n") + "\n");
  console.log(`Wrote ${sortedWords.length} words to ${wordsPath}`);

  // Generate user-patterns for common tooltip formats
  const patterns = [
    // Stat values: "+12% to Chaos Resistance", "+3 to Level"
    "\\+\\d+%",
    "\\+\\d+",
    "\\-\\d+%",
    "\\-\\d+",
    // Ranges: "10-20"
    "\\d+-\\d+",
    // Currency amounts: "7x Divine Orb", "35x Divine Orb"
    "\\d+x",
    // Quality: "+20%"
    "\\d+%",
    // Level requirements: "Level \\d+"
    "Level \\d+",
    // Asking Price section
    "Asking Price:",
    // Item level
    "Item Level: \\d+",
    // Requires line
    "Requires:",
    // Rating values
    "Rating: \\d+",
    "Shield: \\d+",
    "Quality: \\+\\d+%",
  ];
  const patternsPath = join(__dirname, "poe2.user-patterns");
  writeFileSync(patternsPath, patterns.join("\n") + "\n");
  console.log(`Wrote ${patterns.length} patterns to ${patternsPath}`);
}

main().catch((e) => {
  console.error(e);
  process.exit(1);
});