lean-ctx 3.1.4

use std::path::Path;

use crate::core::compressor;
use crate::core::entropy;
use crate::core::signatures;
use crate::core::symbol_map::{self, SymbolMap};
use crate::core::tokens::count_tokens;
use crate::tools::CrpMode;

pub fn handle(path: &str, crp_mode: CrpMode) -> String {
    let content = match std::fs::read_to_string(path) {
        Ok(c) => c,
        Err(e) => return format!("ERROR: {e}"),
    };

    let line_count = content.lines().count();
    let short = crate::core::protocol::shorten_path(path);
    let ext = Path::new(path)
        .extension()
        .and_then(|e| e.to_str())
        .unwrap_or("");

    let raw_tokens = count_tokens(&content);

    let aggressive = compressor::aggressive_compress(&content, Some(ext));
    let aggressive_tokens = count_tokens(&aggressive);

    let sigs = signatures::extract_signatures(&content, ext);
    let sig_compact: String = sigs
        .iter()
        .map(|s| s.to_compact())
        .collect::<Vec<_>>()
        .join("\n");
    let sig_tokens = count_tokens(&sig_compact);

    let sig_tdd: String = sigs
        .iter()
        .map(|s| s.to_tdd())
        .collect::<Vec<_>>()
        .join("\n");
    let sig_tdd_tokens = count_tokens(&sig_tdd);

    let entropy_result = entropy::entropy_compress(&content);
    let entropy_tokens = entropy_result.compressed_tokens;

    let cache_hit = format!("F? cached 2t {line_count}L");
    let cache_tokens = count_tokens(&cache_hit);

    let mut sym = SymbolMap::new();
    let idents = symbol_map::extract_identifiers(&content, ext);
    for ident in &idents {
        sym.register(ident);
    }
    let tdd_full = sym.apply(&content);
    let tdd_table = sym.format_table();
    let tdd_full_tokens = count_tokens(&tdd_full) + count_tokens(&tdd_table);

    let tdd_agg = sym.apply(&aggressive);
    let tdd_agg_tokens = count_tokens(&tdd_agg) + count_tokens(&tdd_table);

    let mut rows = Vec::new();
    rows.push(format!("Benchmark: {short} ({line_count}L)\n"));

    if crp_mode.is_tdd() {
        rows.push(format!(
            "{:<28} {:>6}  {:>8}",
            "Strategy", "Tokens", "Savings"
        ));
        rows.push("─".repeat(46));
        rows.push(format_row("raw", raw_tokens, raw_tokens));
        rows.push(format_row("aggressive", aggressive_tokens, raw_tokens));
        rows.push(format_row("signatures (compact)", sig_tokens, raw_tokens));
        rows.push(format_row("signatures (tdd)", sig_tdd_tokens, raw_tokens));
        rows.push(format_row("entropy", entropy_tokens, raw_tokens));
        rows.push(format_row("full + §MAP (tdd)", tdd_full_tokens, raw_tokens));
        rows.push(format_row(
            "aggressive + §MAP (tdd)",
            tdd_agg_tokens,
            raw_tokens,
        ));
        rows.push(format_row("cache hit", cache_tokens, raw_tokens));
        rows.push("─".repeat(46));

        let strategies = [
            ("aggressive", aggressive_tokens),
            ("signatures (compact)", sig_tokens),
            ("signatures (tdd)", sig_tdd_tokens),
            ("entropy", entropy_tokens),
            ("full + §MAP", tdd_full_tokens),
            ("aggressive + §MAP", tdd_agg_tokens),
            ("cache hit", cache_tokens),
        ];
        if let Some(best) = strategies.iter().min_by_key(|(_, t)| *t) {
            let saved = raw_tokens.saturating_sub(best.1);
            let pct = if raw_tokens > 0 {
                (saved as f64 / raw_tokens as f64 * 100.0).round() as usize
            } else {
                0
            };
            rows.push(format!(
                "Best: \"{}\" saves {} tokens ({}%)",
                best.0, saved, pct
            ));
        }

        let tdd_extra = sig_tokens.saturating_sub(sig_tdd_tokens);
        let tdd_pct = if sig_tokens > 0 {
            (tdd_extra as f64 / sig_tokens as f64 * 100.0).round() as usize
        } else {
            0
        };
        rows.push(format!(
            "TDD bonus (signatures): {} extra tokens saved ({}%)",
            tdd_extra, tdd_pct
        ));
    } else {
        rows.push(format!(
            "{:<24} {:>6}  {:>8}",
            "Strategy", "Tokens", "Savings"
        ));
        rows.push("─".repeat(42));
        rows.push(format_row("raw", raw_tokens, raw_tokens));
        rows.push(format_row("aggressive", aggressive_tokens, raw_tokens));
        rows.push(format_row("signatures (compact)", sig_tokens, raw_tokens));
        rows.push(format_row("entropy", entropy_tokens, raw_tokens));
        rows.push(format_row("cache hit", cache_tokens, raw_tokens));
        rows.push("─".repeat(42));

        let strategies = [
            ("aggressive", aggressive_tokens),
            ("signatures", sig_tokens),
            ("entropy", entropy_tokens),
            ("cache hit", cache_tokens),
        ];
        if let Some(best) = strategies.iter().min_by_key(|(_, t)| *t) {
            let saved = raw_tokens.saturating_sub(best.1);
            let pct = if raw_tokens > 0 {
                (saved as f64 / raw_tokens as f64 * 100.0).round() as usize
            } else {
                0
            };
            rows.push(format!(
                "Best: \"{}\" saves {} tokens ({}%)",
                best.0, saved, pct
            ));
        }
    }

    rows.join("\n")
}

fn format_row(name: &str, tokens: usize, baseline: usize) -> String {
    if tokens >= baseline {
        format!("{name:<28} {tokens:>6}  —")
    } else {
        let saved = baseline - tokens;
        let pct = (saved as f64 / baseline as f64 * 100.0).round() as usize;
        format!("{name:<28} {tokens:>6}  -{saved} ({pct}%)")
    }
}