use std::path::Path;

use crate::core::compressor;
use crate::core::deps as dep_extract;
use crate::core::entropy;
use crate::core::io_boundary;
use crate::core::patterns::deps_cmd;
use crate::core::protocol;
use crate::core::roles;
use crate::core::signatures;

fn resolve_cli_path(raw: &str) -> String {
    if let Ok(abs) = std::path::Path::new(raw).canonicalize() {
        return abs.to_string_lossy().to_string();
    }
    if Path::new(raw).is_relative() {
        if let Ok(cwd) = std::env::current_dir() {
            return cwd.join(raw).to_string_lossy().into_owned();
        }
    }
    raw.to_string()
}
use crate::core::tokens::count_tokens;

use super::common::print_savings;

pub fn cmd_read(args: &[String]) {
    if args.is_empty() {
        eprintln!(
            "Usage: lean-ctx read <file> [--mode auto|full|map|signatures|aggressive|entropy] [--fresh]"
        );
        std::process::exit(1);
    }

    let raw_path = &args[0];
    let path = if Path::new(raw_path).is_relative() {
        std::env::current_dir().ok().map_or_else(
            || raw_path.clone(),
            |cwd| cwd.join(raw_path).to_string_lossy().into_owned(),
        )
    } else {
        raw_path.clone()
    };
    let path = path.as_str();
    let mode = args
        .iter()
        .position(|a| a == "--mode" || a == "-m")
        .and_then(|i| args.get(i + 1))
        .map_or("auto", std::string::String::as_str);
    let force_fresh = args.iter().any(|a| a == "--fresh" || a == "--no-cache");

    let short = protocol::shorten_path(path);

    // Apply the same secret-path policy in CLI mode as in MCP tools.
    // Default is warn; enforce depends on active role/policy.
    if let Ok(abs) = std::fs::canonicalize(path) {
        match io_boundary::check_secret_path_for_tool("cli_read", &abs) {
            Ok(Some(w)) => eprintln!("{w}"),
            Ok(None) => {}
            Err(e) => {
                eprintln!("{e}");
                std::process::exit(1);
            }
        }
    } else {
        // Best-effort: still check the raw path string.
        let raw = std::path::Path::new(path);
        match io_boundary::check_secret_path_for_tool("cli_read", raw) {
            Ok(Some(w)) => eprintln!("{w}"),
            Ok(None) => {}
            Err(e) => {
                eprintln!("{e}");
                std::process::exit(1);
            }
        }
    }

    #[cfg(unix)]
    {
        #[cfg(unix)]
        if let Some(out) = crate::daemon_client::try_daemon_tool_call_blocking_text(
            "ctx_read",
            Some(serde_json::json!({
                "path": path,
                "mode": mode,
                "fresh": force_fresh,
            })),
        ) {
            let filtered = super::common::filter_daemon_output(&out);
            if !filtered.trim().is_empty() {
                println!("{filtered}");
                return;
            }
        }
    }
    super::common::daemon_fallback_hint();

    if !force_fresh && mode == "full" {
        use crate::core::cli_cache::{self, CacheResult};
        match cli_cache::check_and_read(path) {
            CacheResult::Hit { entry, file_ref } => {
                let msg = cli_cache::format_hit(&entry, &file_ref, &short);
                println!("{msg}");
                let sent = count_tokens(&msg);
                super::common::cli_track_read_cached(path, "full", entry.original_tokens, sent);
                return;
            }
            CacheResult::Miss { content } if content.is_empty() => {
                eprintln!("Error: could not read {path}");
                std::process::exit(1);
            }
            CacheResult::Miss { content } => {
                let line_count = content.lines().count();
                println!("{short} [{line_count}L]");
                println!("{content}");
                let tok = count_tokens(&content);
                super::common::cli_track_read(path, "full", tok, tok);
                return;
            }
        }
    }

    let content = match crate::tools::ctx_read::read_file_lossy(path) {
        Ok(c) => c,
        Err(e) => {
            eprintln!("Error: {e}");
            std::process::exit(1);
        }
    };

    let ext = Path::new(path)
        .extension()
        .and_then(|e| e.to_str())
        .unwrap_or("");
    let line_count = content.lines().count();
    let original_tokens = count_tokens(&content);

    let mode = if mode == "auto" {
        if crate::tools::ctx_read::is_instruction_file(path) {
            "full".to_string()
        } else {
            let sig = crate::core::mode_predictor::FileSignature::from_path(path, original_tokens);
            let predictor = crate::core::mode_predictor::ModePredictor::new();
            predictor
                .predict_best_mode(&sig)
                .unwrap_or_else(|| "full".to_string())
        }
    } else if mode != "full" && crate::tools::ctx_read::is_instruction_file(path) {
        "full".to_string()
    } else {
        mode.to_string()
    };
    let mode = mode.as_str();

    match mode {
        "map" => {
            let sigs = signatures::extract_signatures(&content, ext);
            let dep_info = dep_extract::extract_deps(&content, ext);

            let mut output_buf = format!("{short} [{line_count}L]");
            if !dep_info.imports.is_empty() {
                output_buf.push_str(&format!("\n  deps: {}", dep_info.imports.join(", ")));
            }
            if !dep_info.exports.is_empty() {
                output_buf.push_str(&format!("\n  exports: {}", dep_info.exports.join(", ")));
            }
            let key_sigs: Vec<_> = sigs
                .iter()
                .filter(|s| s.is_exported || s.indent == 0)
                .collect();
            if !key_sigs.is_empty() {
                output_buf.push_str("\n  API:");
                for sig in &key_sigs {
                    output_buf.push_str(&format!("\n    {}", sig.to_compact()));
                }
            }
            println!("{output_buf}");
            let sent = count_tokens(&output_buf);
            print_savings(original_tokens, sent);
            super::common::cli_track_read(path, "map", original_tokens, sent);
        }
        "signatures" => {
            let sigs = signatures::extract_signatures(&content, ext);
            let mut output_buf = format!("{short} [{line_count}L]");
            for sig in &sigs {
                output_buf.push_str(&format!("\n{}", sig.to_compact()));
            }
            println!("{output_buf}");
            let sent = count_tokens(&output_buf);
            print_savings(original_tokens, sent);
            super::common::cli_track_read(path, "signatures", original_tokens, sent);
        }
        "aggressive" => {
            let compressed = compressor::aggressive_compress(&content, Some(ext));
            println!("{short} [{line_count}L]");
            println!("{compressed}");
            let sent = count_tokens(&compressed);
            print_savings(original_tokens, sent);
            super::common::cli_track_read(path, "aggressive", original_tokens, sent);
        }
        "entropy" => {
            let result = entropy::entropy_compress(&content);
            let avg_h = entropy::analyze_entropy(&content).avg_entropy;
            println!("{short} [{line_count}L] (H̄={avg_h:.1})");
            for tech in &result.techniques {
                println!("{tech}");
            }
            println!("{}", result.output);
            let sent = count_tokens(&result.output);
            print_savings(original_tokens, sent);
            super::common::cli_track_read(path, "entropy", original_tokens, sent);
        }
        _ => {
            let mut output = format!("{short} [{line_count}L]\n{content}");
            let config = crate::core::config::Config::load();
            let level = crate::core::config::CompressionLevel::effective(&config);
            if level.is_active() {
                let terse_result = crate::core::terse::pipeline::compress(&output, &level, None);
                if terse_result.quality_passed && terse_result.savings_pct >= 3.0 {
                    output = terse_result.output;
                }
            }
            println!("{output}");
            let sent = count_tokens(&output);
            super::common::cli_track_read(path, "full", original_tokens, sent);
        }
    }
}

pub fn cmd_diff(args: &[String]) {
    if args.len() < 2 {
        eprintln!("Usage: lean-ctx diff <file1> <file2>");
        std::process::exit(1);
    }

    let content1 = match crate::tools::ctx_read::read_file_lossy(&args[0]) {
        Ok(c) => c,
        Err(e) => {
            eprintln!("Error reading {}: {e}", args[0]);
            std::process::exit(1);
        }
    };

    let content2 = match crate::tools::ctx_read::read_file_lossy(&args[1]) {
        Ok(c) => c,
        Err(e) => {
            eprintln!("Error reading {}: {e}", args[1]);
            std::process::exit(1);
        }
    };

    let diff = compressor::diff_content(&content1, &content2);
    let original = count_tokens(&content1) + count_tokens(&content2);
    let sent = count_tokens(&diff);

    println!(
        "diff {} {}",
        protocol::shorten_path(&args[0]),
        protocol::shorten_path(&args[1])
    );
    println!("{diff}");
    print_savings(original, sent);
    crate::core::stats::record("cli_diff", original, sent);
}

pub fn cmd_grep(args: &[String]) {
    if args.is_empty() {
        eprintln!("Usage: lean-ctx grep <pattern> [path]");
        std::process::exit(1);
    }

    let pattern = &args[0];
    let raw_path = args.get(1).map_or(".", std::string::String::as_str);
    let abs_path = resolve_cli_path(raw_path);
    let path = abs_path.as_str();

    #[cfg(unix)]
    {
        #[cfg(unix)]
        if let Some(out) = crate::daemon_client::try_daemon_tool_call_blocking_text(
            "ctx_search",
            Some(serde_json::json!({
                "pattern": pattern,
                "path": path,
            })),
        ) {
            let out = super::common::filter_daemon_output(&out);
            println!("{out}");
            if out.trim_start().starts_with("0 matches") {
                std::process::exit(1);
            }
            return;
        }
    }
    super::common::daemon_fallback_hint();

    let (out, original) = crate::tools::ctx_search::handle(
        pattern,
        path,
        None,
        20,
        crate::tools::CrpMode::effective(),
        true,
        roles::active_role().io.allow_secret_paths,
    );
    println!("{out}");
    super::common::cli_track_search(original, count_tokens(&out));
    if original == 0 && out.trim_start().starts_with("0 matches") {
        std::process::exit(1);
    }
}

pub fn cmd_find(args: &[String]) {
    if args.is_empty() {
        eprintln!("Usage: lean-ctx find <pattern> [path]");
        std::process::exit(1);
    }

    let raw_pattern = &args[0];
    let path = args.get(1).map_or(".", std::string::String::as_str);

    let is_glob = raw_pattern.contains('*') || raw_pattern.contains('?');
    let glob_matcher = if is_glob {
        glob::Pattern::new(&raw_pattern.to_lowercase()).ok()
    } else {
        None
    };
    let substring = raw_pattern.to_lowercase();

    let mut found = false;
    for entry in ignore::WalkBuilder::new(path)
        .hidden(true)
        .git_ignore(true)
        .git_global(true)
        .git_exclude(true)
        .max_depth(Some(10))
        .build()
        .flatten()
    {
        let name = entry.file_name().to_string_lossy().to_lowercase();
        let matches = if let Some(ref g) = glob_matcher {
            g.matches(&name)
        } else {
            name.contains(&substring)
        };
        if matches {
            println!("{}", entry.path().display());
            found = true;
        }
    }

    crate::core::stats::record("cli_find", 0, 0);

    if !found {
        std::process::exit(1);
    }
}

pub fn cmd_ls(args: &[String]) {
    let mut raw_path = ".";
    let mut depth = 3usize;
    let mut show_hidden = false;
    let mut i = 0;

    while i < args.len() {
        let arg = &args[i];
        if arg == "--depth" {
            i += 1;
            if let Some(d) = args.get(i).and_then(|s| s.parse::<usize>().ok()) {
                depth = d.min(10);
            }
        } else if arg == "--all" || arg == "-a" {
            show_hidden = true;
        } else if arg.starts_with('-') {
            eprintln!("Error: lean-ctx ls does not support flag '{arg}'.\n");
            eprintln!("lean-ctx ls is a compressed directory tree viewer for AI context, not a drop-in ls replacement.");
            eprintln!("The shell hook (lean-ctx -t ls {arg} ...) passes flags to system ls transparently.\n");
            eprintln!("Usage: lean-ctx ls [path] [--depth N] [--all]");
            std::process::exit(1);
        } else {
            raw_path = arg;
        }
        i += 1;
    }

    let abs_path = resolve_cli_path(raw_path);
    let path = abs_path.as_str();

    #[cfg(unix)]
    {
        #[cfg(unix)]
        if let Some(out) = crate::daemon_client::try_daemon_tool_call_blocking_text(
            "ctx_tree",
            Some(serde_json::json!({
                "path": path,
                "depth": depth,
                "show_hidden": show_hidden,
            })),
        ) {
            println!("{}", super::common::filter_daemon_output(&out));
            return;
        }
    }
    super::common::daemon_fallback_hint();

    let (out, _original) = crate::tools::ctx_tree::handle(path, depth, show_hidden);
    println!("{out}");
    super::common::cli_track_tree(0, count_tokens(&out));
}

pub fn cmd_deps(args: &[String]) {
    let path = args.first().map_or(".", std::string::String::as_str);

    if let Some(result) = deps_cmd::detect_and_compress(path) {
        println!("{result}");
        crate::core::stats::record("cli_deps", 0, 0);
    } else {
        eprintln!("No dependency file found in {path}");
        std::process::exit(1);
    }
}
