use std::fs::File;
use std::io::{ BufRead, BufReader};

pub fn load_knowledge() -> String {
    let path = "output/english_master.jsonl";

    let file = match File::open(path) {
        Ok(f) => f,
        Err(e) => {
            eprintln!("❌ Could not open {}: {}", path, e);
            return "Knowledge base not found.".to_string();
        }
    };

    let reader = BufReader::new(file);
    let mut knowledge = String::from("=== ENGLISH MASTERY KNOWLEDGE BASE ===\n\n");
    let mut count = 0;

    for line in reader.lines() {
        let line = match line {
            Ok(l) => l,
            Err(_) => continue,
        };

        let trimmed = line.trim();
        if trimmed.is_empty() {
            continue;
        }

        // Just add the raw line as-is (since it's JSONL)
        knowledge.push_str(trimmed);
        knowledge.push_str("\n\n");
        count += 1;
    }

    knowledge.push_str(&format!("\n=== TOTAL: {} EXAMPLES LOADED ===\n", count));
    println!("📚 Successfully loaded {} examples from english_master.jsonl", count);

    knowledge
}