limit-cli 0.0.46

use frizbee::Config as FrizbeeConfig;
use ignore::WalkBuilder;
use std::path::{Path, PathBuf};
use std::time::{Duration, Instant};

/// Represents a matched file with fuzzy score
#[derive(Debug, Clone)]
pub struct FileMatch {
    /// Relative path from working directory
    pub path: PathBuf,
    /// Whether it's a directory
    pub is_dir: bool,
    /// Fuzzy match score (higher is better)
    pub score: i64,
}

/// File finder with fuzzy matching and caching
/// Uses the `ignore` crate from ripgrep to automatically respect .gitignore
pub struct FileFinder {
    /// Working directory for file scanning
    working_dir: PathBuf,
    /// Cached file list
    cached_files: Vec<PathBuf>,
    /// Last scan timestamp
    last_scan: Option<Instant>,
    /// Cache time-to-live
    cache_ttl: Duration,
    /// Maximum scan depth
    max_depth: usize,
}

impl FileFinder {
    /// Create a new FileFinder for the given working directory
    /// Automatically respects .gitignore, .ignore, and other standard ignore files
    pub fn new(working_dir: PathBuf) -> Self {
        Self {
            working_dir,
            cached_files: Vec::new(),
            last_scan: None,
            cache_ttl: Duration::from_secs(5),
            max_depth: 10,
        }
    }

    /// Scan directory and return all files (relative paths)
    /// The `ignore` crate automatically handles .gitignore, .ignore, etc.
    pub fn scan_files(&mut self) -> &Vec<PathBuf> {
        // Check cache
        if let Some(last_scan) = self.last_scan {
            if last_scan.elapsed() < self.cache_ttl {
                return &self.cached_files;
            }
        }

        // Rescan
        self.cached_files.clear();

        // Use ignore crate's WalkBuilder which respects .gitignore automatically
        for result in WalkBuilder::new(&self.working_dir)
            .max_depth(Some(self.max_depth))
            .hidden(true) // Skip hidden files
            .git_ignore(true) // Respect .gitignore
            .git_global(true) // Respect global gitignore
            .git_exclude(true) // Respect .git/info/exclude
            .ignore(true) // Respect .ignore files
            .build()
        {
            match result {
                Ok(entry) => {
                    let path = entry.path();

                    // Get relative path
                    if let Ok(rel_path) = path.strip_prefix(&self.working_dir) {
                        // Skip the root directory itself (empty path)
                        if rel_path.as_os_str().is_empty() {
                            continue;
                        }

                        self.cached_files.push(rel_path.to_path_buf());
                    }
                }
                Err(err) => {
                    tracing::debug!("Error scanning directory: {}", err);
                }
            }
        }

        // Sort for consistent ordering
        self.cached_files.sort();

        self.last_scan = Some(Instant::now());
        &self.cached_files
    }

    /// Filter files by query using fuzzy matching with frizbee
    pub fn filter_files(&self, files: &[PathBuf], query: &str) -> Vec<FileMatch> {
        if query.is_empty() {
            // Return first 20 files if no query
            return files
                .iter()
                .take(20)
                .map(|p| FileMatch {
                    path: p.clone(),
                    is_dir: p.to_string_lossy().ends_with('/'),
                    score: 0,
                })
                .collect();
        }

        // Use frizbee for fuzzy matching
        // Convert paths to strings first (owned)
        let haystacks: Vec<String> = files
            .iter()
            .map(|p| p.to_string_lossy().to_string())
            .collect();

        // Create a slice of &str for frizbee
        let haystack_refs: Vec<&str> = haystacks.iter().map(|s| s.as_str()).collect();

        // Configure frizbee for fuzzy matching
        let config = FrizbeeConfig::default();

        // Match files against query
        let fuzzy_matches = frizbee::match_list(query, &haystack_refs, &config);

        // Convert frizbee matches to our FileMatch type
        let mut matches: Vec<FileMatch> = fuzzy_matches
            .into_iter()
            .filter_map(|m| {
                // frizbee returns Match with index, score, and exact
                if (m.index as usize) < files.len() {
                    let path = files[m.index as usize].clone();
                    let path_str = haystacks[m.index as usize].clone();

                    Some(FileMatch {
                        path,
                        is_dir: path_str.ends_with('/'),
                        score: m.score as i64,
                    })
                } else {
                    None
                }
            })
            .collect();

        // Sort by score (descending) - frizbee returns higher scores for better matches
        matches.sort_by(|a, b| b.score.cmp(&a.score));

        // Limit to 20 results
        matches.truncate(20);
        matches
    }

    /// Get the working directory
    pub fn working_dir(&self) -> &Path {
        &self.working_dir
    }

    /// Force refresh the cache
    pub fn refresh_cache(&mut self) {
        self.last_scan = None;
        self.scan_files();
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_file_finder_basic() {
        let dir = std::env::current_dir().unwrap();
        let mut finder = FileFinder::new(dir);
        let files = finder.scan_files();

        // Should find Cargo.toml in current directory
        assert!(files.iter().any(|p| p.to_string_lossy() == "Cargo.toml"));

        // Should NOT include .git directory (respects .gitignore)
        assert!(!files
            .iter()
            .any(|p| p.to_string_lossy().starts_with(".git/")));

        // Should NOT include target directory (respects .gitignore)
        assert!(!files
            .iter()
            .any(|p| p.to_string_lossy().starts_with("target/")));
    }

    #[test]
    fn test_filter_files() {
        let dir = std::env::current_dir().unwrap();
        let mut finder = FileFinder::new(dir);
        let files = finder.scan_files().clone();

        let matches = finder.filter_files(&files, "Cargo");
        assert!(!matches.is_empty());
        assert!(matches
            .iter()
            .any(|m| m.path.to_string_lossy() == "Cargo.toml"));
    }

    #[test]
    fn test_cache_ttl() {
        let dir = std::env::current_dir().unwrap();
        let mut finder = FileFinder::new(dir);
        finder.cache_ttl = std::time::Duration::from_millis(50);

        // First scan
        let files1 = finder.scan_files().clone();

        // Should use cache immediately
        let files2 = finder.scan_files().clone();
        assert_eq!(files1.len(), files2.len());

        // Wait for cache to expire
        std::thread::sleep(std::time::Duration::from_millis(60));

        // Should have rescanned
        let files3 = finder.scan_files().clone();
        assert!(!files3.is_empty());
    }

    #[test]
    fn test_gitignore_respected() {
        let dir = std::env::current_dir().unwrap();
        let mut finder = FileFinder::new(dir);
        let files = finder.scan_files();

        // These directories should be excluded by .gitignore
        let file_paths: Vec<String> = files
            .iter()
            .map(|p| p.to_string_lossy().to_string())
            .collect();

        // Check that common ignored patterns are not present
        for path in &file_paths {
            assert!(
                !path.starts_with("target/"),
                "Found target/ in results: {}",
                path
            );
            assert!(
                !path.starts_with(".git/"),
                "Found .git/ in results: {}",
                path
            );
        }
    }
}