heroforge-core 0.2.2

//! File finding and pattern matching operations.
//!
//! This module provides a powerful find API for searching files in Heroforge repositories
//! using glob patterns, ignore rules, and various filters.
//!
//! # Examples
//!
//! ```no_run
//! use heroforge_core::Repository;
//! use heroforge_core::fs::Find;
//!
//! let repo = Repository::open("project.forge")?;
//!
//! // Find all Rust files
//! let rust_files = Find::new(&repo)
//!     .pattern("**/*.rs")
//!     .paths()?;
//!
//! // Find with filters
//! let filtered = Find::new(&repo)
//!     .pattern("**/*.rs")
//!     .ignore("target/**")
//!     .ignore_hidden()
//!     .max_depth(5)
//!     .paths()?;
//! # Ok::<(), heroforge_core::FossilError>(())
//! ```

use crate::error::Result;
use crate::repo::Repository;
use std::collections::HashSet;

/// Unix-style file permissions.
///
/// # Examples
///
/// ```
/// use heroforge_core::fs::Permissions;
///
/// // Create from octal
/// let perms = Permissions::from_octal(0o755);
/// assert_eq!(perms.to_string_repr(), "rwxr-xr-x");
///
/// // Use preset
/// let exec = Permissions::executable();
/// assert_eq!(exec.to_octal(), 0o755);
/// ```
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Permissions {
    /// Read permission for owner
    pub owner_read: bool,
    /// Write permission for owner
    pub owner_write: bool,
    /// Execute permission for owner
    pub owner_exec: bool,
    /// Read permission for group
    pub group_read: bool,
    /// Write permission for group
    pub group_write: bool,
    /// Execute permission for group
    pub group_exec: bool,
    /// Read permission for others
    pub other_read: bool,
    /// Write permission for others
    pub other_write: bool,
    /// Execute permission for others
    pub other_exec: bool,
}

impl Permissions {
    /// Create permissions from octal (e.g., 0o755).
    pub fn from_octal(mode: u32) -> Self {
        Self {
            owner_read: mode & 0o400 != 0,
            owner_write: mode & 0o200 != 0,
            owner_exec: mode & 0o100 != 0,
            group_read: mode & 0o040 != 0,
            group_write: mode & 0o020 != 0,
            group_exec: mode & 0o010 != 0,
            other_read: mode & 0o004 != 0,
            other_write: mode & 0o002 != 0,
            other_exec: mode & 0o001 != 0,
        }
    }

    /// Convert to octal representation.
    pub fn to_octal(&self) -> u32 {
        let mut mode = 0u32;
        if self.owner_read {
            mode |= 0o400;
        }
        if self.owner_write {
            mode |= 0o200;
        }
        if self.owner_exec {
            mode |= 0o100;
        }
        if self.group_read {
            mode |= 0o040;
        }
        if self.group_write {
            mode |= 0o020;
        }
        if self.group_exec {
            mode |= 0o010;
        }
        if self.other_read {
            mode |= 0o004;
        }
        if self.other_write {
            mode |= 0o002;
        }
        if self.other_exec {
            mode |= 0o001;
        }
        mode
    }

    /// Convert to string representation (e.g., "rwxr-xr-x").
    pub fn to_string_repr(&self) -> String {
        format!(
            "{}{}{}{}{}{}{}{}{}",
            if self.owner_read { 'r' } else { '-' },
            if self.owner_write { 'w' } else { '-' },
            if self.owner_exec { 'x' } else { '-' },
            if self.group_read { 'r' } else { '-' },
            if self.group_write { 'w' } else { '-' },
            if self.group_exec { 'x' } else { '-' },
            if self.other_read { 'r' } else { '-' },
            if self.other_write { 'w' } else { '-' },
            if self.other_exec { 'x' } else { '-' },
        )
    }

    /// Create permissions for a regular file (644 = rw-r--r--).
    pub fn file() -> Self {
        Self::from_octal(0o644)
    }

    /// Create permissions for an executable file (755 = rwxr-xr-x).
    pub fn executable() -> Self {
        Self::from_octal(0o755)
    }

    /// Create permissions for a read-only file (444 = r--r--r--).
    pub fn readonly() -> Self {
        Self::from_octal(0o444)
    }
}

/// Type of file entry in the repository.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum FileType {
    /// Regular file
    Regular,
    /// Executable file
    Executable,
    /// Symbolic link with target path
    Symlink(String),
}

/// Extended file information including permissions and type.
#[derive(Debug, Clone)]
pub struct FileEntry {
    /// File path relative to repository root
    pub path: String,
    /// SHA3-256 hash of file content
    pub hash: String,
    /// Type of file (regular, executable, symlink)
    pub file_type: FileType,
    /// Unix permissions (if tracked)
    pub permissions: Option<Permissions>,
    /// File size in bytes
    pub size: Option<usize>,
}

/// Result of a find operation with metadata.
#[derive(Debug, Clone)]
pub struct FindResult {
    /// Matched files with metadata
    pub files: Vec<FileEntry>,
    /// Total number of matches
    pub count: usize,
    /// Number of directories traversed during search
    pub dirs_traversed: usize,
}

/// File finder with pattern matching support.
///
/// Create via [`Find::new()`] and chain methods to configure the search.
///
/// # Examples
///
/// ## Basic Pattern Matching
///
/// ```no_run
/// use heroforge_core::Repository;
/// use heroforge_core::fs::Find;
///
/// let repo = Repository::open("project.forge")?;
///
/// // Find all Rust source files
/// let rust_files = Find::new(&repo)
///     .pattern("**/*.rs")
///     .paths()?;
///
/// // Find multiple patterns
/// let source_files = Find::new(&repo)
///     .patterns(&["**/*.rs", "**/*.toml", "**/*.md"])
///     .paths()?;
/// # Ok::<(), heroforge_core::FossilError>(())
/// ```
///
/// ## Ignore Patterns
///
/// ```no_run
/// # use heroforge_core::Repository;
/// # use heroforge_core::fs::Find;
/// # let repo = Repository::open("project.forge")?;
/// // Exclude build artifacts
/// let files = Find::new(&repo)
///     .pattern("**/*.rs")
///     .ignore("target/**")
///     .ignore("**/generated/**")
///     .paths()?;
///
/// // Use common gitignore patterns
/// let clean = Find::new(&repo)
///     .pattern("**/*")
///     .use_gitignore()
///     .ignore_hidden()
///     .paths()?;
/// # Ok::<(), heroforge_core::FossilError>(())
/// ```
///
/// ## Directory and Depth Limits
///
/// ```no_run
/// # use heroforge_core::Repository;
/// # use heroforge_core::fs::Find;
/// # let repo = Repository::open("project.forge")?;
/// // Search only in src directory
/// let src_files = Find::new(&repo)
///     .in_dir("src")
///     .pattern("**/*.rs")
///     .paths()?;
///
/// // Limit depth to 2 levels
/// let shallow = Find::new(&repo)
///     .pattern("**/*")
///     .max_depth(2)
///     .paths()?;
/// # Ok::<(), heroforge_core::FossilError>(())
/// ```
pub struct Find<'a> {
    repo: &'a Repository,
    base_commit: Option<String>,
    patterns: Vec<String>,
    ignore_patterns: Vec<String>,
    ignore_hidden: bool,
    ignore_case: bool,
    max_depth: Option<usize>,
    file_type_filter: Option<FileType>,
    min_size: Option<usize>,
    max_size: Option<usize>,
    base_dir: Option<String>,
}

impl<'a> Find<'a> {
    /// Create a new Find instance for the given repository.
    pub fn new(repo: &'a Repository) -> Self {
        Self {
            repo,
            base_commit: None,
            patterns: Vec::new(),
            ignore_patterns: Vec::new(),
            ignore_hidden: false,
            ignore_case: false,
            max_depth: None,
            file_type_filter: None,
            min_size: None,
            max_size: None,
            base_dir: None,
        }
    }

    /// Search at a specific commit hash.
    pub fn at_commit(mut self, hash: &str) -> Self {
        self.base_commit = Some(hash.to_string());
        self
    }

    /// Search on trunk (default).
    pub fn on_trunk(mut self) -> Self {
        self.base_commit = None;
        self
    }

    /// Search on a specific branch.
    pub fn on_branch(mut self, branch: &str) -> Result<Self> {
        let tip = self.repo.branch_tip_internal(branch)?;
        self.base_commit = Some(tip.hash);
        Ok(self)
    }

    /// Add a glob pattern to match files.
    ///
    /// Supports standard glob syntax:
    /// - `*` matches any sequence of characters in a path segment
    /// - `**` matches any sequence of path segments
    /// - `?` matches any single character
    /// - `[abc]` matches any character in the brackets
    pub fn pattern(mut self, pattern: &str) -> Self {
        self.patterns.push(pattern.to_string());
        self
    }

    /// Add multiple glob patterns at once.
    pub fn patterns(mut self, patterns: &[&str]) -> Self {
        for p in patterns {
            self.patterns.push(p.to_string());
        }
        self
    }

    /// Exclude files matching this pattern.
    pub fn ignore(mut self, pattern: &str) -> Self {
        self.ignore_patterns.push(pattern.to_string());
        self
    }

    /// Add multiple ignore patterns at once.
    pub fn ignore_patterns(mut self, patterns: &[&str]) -> Self {
        for p in patterns {
            self.ignore_patterns.push(p.to_string());
        }
        self
    }

    /// Exclude hidden files (files starting with `.`).
    pub fn ignore_hidden(mut self) -> Self {
        self.ignore_hidden = true;
        self
    }

    /// Apply common gitignore-style patterns.
    pub fn use_gitignore(mut self) -> Self {
        self.ignore_patterns.extend(vec![
            ".git/**".to_string(),
            ".gitignore".to_string(),
            "node_modules/**".to_string(),
            "target/**".to_string(),
            "*.pyc".to_string(),
            "__pycache__/**".to_string(),
            ".DS_Store".to_string(),
            "*.swp".to_string(),
            "*.swo".to_string(),
            "*~".to_string(),
        ]);
        self
    }

    /// Enable case-insensitive pattern matching.
    pub fn ignore_case(mut self) -> Self {
        self.ignore_case = true;
        self
    }

    /// Limit search to a maximum directory depth.
    pub fn max_depth(mut self, depth: usize) -> Self {
        self.max_depth = Some(depth);
        self
    }

    /// Only match regular files (exclude executables and symlinks).
    pub fn files_only(mut self) -> Self {
        self.file_type_filter = Some(FileType::Regular);
        self
    }

    /// Only match executable files.
    pub fn executables_only(mut self) -> Self {
        self.file_type_filter = Some(FileType::Executable);
        self
    }

    /// Only match symbolic links.
    pub fn symlinks_only(mut self) -> Self {
        self.file_type_filter = Some(FileType::Symlink(String::new()));
        self
    }

    /// Filter to files at least this size (in bytes).
    pub fn min_size(mut self, bytes: usize) -> Self {
        self.min_size = Some(bytes);
        self
    }

    /// Filter to files at most this size (in bytes).
    pub fn max_size(mut self, bytes: usize) -> Self {
        self.max_size = Some(bytes);
        self
    }

    /// Restrict search to a specific directory.
    pub fn in_dir(mut self, dir: &str) -> Self {
        self.base_dir = Some(dir.trim_end_matches('/').to_string());
        self
    }

    /// Execute the search and return full results with metadata.
    pub fn execute(&self) -> Result<FindResult> {
        let commit_hash = if let Some(ref hash) = self.base_commit {
            hash.clone()
        } else {
            let tip = self.repo.branch_tip_internal("trunk")?;
            tip.hash
        };

        let all_files = self.repo.list_files_internal(&commit_hash)?;
        let mut matched_files = Vec::new();
        let mut dirs_seen = HashSet::new();

        let match_patterns: Vec<glob::Pattern> = self
            .patterns
            .iter()
            .filter_map(|p| {
                let p = if self.ignore_case {
                    p.to_lowercase()
                } else {
                    p.clone()
                };
                glob::Pattern::new(&p).ok()
            })
            .collect();

        let ignore_patterns: Vec<glob::Pattern> = self
            .ignore_patterns
            .iter()
            .filter_map(|p| {
                let p = if self.ignore_case {
                    p.to_lowercase()
                } else {
                    p.clone()
                };
                glob::Pattern::new(&p).ok()
            })
            .collect();

        for file in all_files {
            let file_path = if self.ignore_case {
                file.name.to_lowercase()
            } else {
                file.name.clone()
            };

            if let Some(idx) = file.name.rfind('/') {
                dirs_seen.insert(file.name[..idx].to_string());
            }

            if let Some(ref base) = self.base_dir {
                if !file.name.starts_with(base) && !file.name.starts_with(&format!("{}/", base)) {
                    continue;
                }
            }

            if let Some(max_depth) = self.max_depth {
                let depth = file.name.matches('/').count();
                let base_depth = self
                    .base_dir
                    .as_ref()
                    .map(|b| b.matches('/').count())
                    .unwrap_or(0);
                if depth - base_depth > max_depth {
                    continue;
                }
            }

            if self.ignore_hidden {
                let file_name = file.name.rsplit('/').next().unwrap_or(&file.name);
                if file_name.starts_with('.') {
                    continue;
                }
            }

            let ignored = ignore_patterns.iter().any(|p| p.matches(&file_path));
            if ignored {
                continue;
            }

            let matches = if match_patterns.is_empty() {
                true
            } else {
                match_patterns.iter().any(|p| p.matches(&file_path))
            };

            if matches {
                matched_files.push(FileEntry {
                    path: file.name.clone(),
                    hash: file.hash.clone(),
                    file_type: FileType::Regular,
                    permissions: file.permissions.as_ref().map(|p| {
                        Permissions::from_octal(u32::from_str_radix(p, 8).unwrap_or(0o644))
                    }),
                    size: file.size,
                });
            }
        }

        Ok(FindResult {
            count: matched_files.len(),
            files: matched_files,
            dirs_traversed: dirs_seen.len(),
        })
    }

    /// Execute and return just the file paths.
    pub fn paths(&self) -> Result<Vec<String>> {
        Ok(self.execute()?.files.into_iter().map(|f| f.path).collect())
    }

    /// Execute and return only the count of matching files.
    pub fn count(&self) -> Result<usize> {
        Ok(self.execute()?.count)
    }
}

/// Convenience function to find files matching a pattern.
///
/// # Examples
///
/// ```no_run
/// use heroforge_core::Repository;
/// use heroforge_core::fs::find;
///
/// let repo = Repository::open("project.forge")?;
/// let rust_files = find(&repo, "**/*.rs")?;
/// # Ok::<(), heroforge_core::FossilError>(())
/// ```
pub fn find(repo: &Repository, pattern: &str) -> Result<Vec<String>> {
    Find::new(repo).pattern(pattern).paths()
}

/// Convenience function to count files matching a pattern.
pub fn count(repo: &Repository, pattern: &str) -> Result<usize> {
    Find::new(repo).pattern(pattern).count()
}

/// Check if a file exists at the given path.
pub fn exists(repo: &Repository, path: &str) -> Result<bool> {
    let tip = repo.branch_tip_internal("trunk")?;
    let files = repo.list_files_internal(&tip.hash)?;
    Ok(files.iter().any(|f| f.name == path))
}

/// Check if a path represents a directory.
pub fn is_dir(repo: &Repository, path: &str) -> Result<bool> {
    let tip = repo.branch_tip_internal("trunk")?;
    let files = repo.list_files_internal(&tip.hash)?;
    let prefix = format!("{}/", path.trim_end_matches('/'));
    Ok(files.iter().any(|f| f.name.starts_with(&prefix)))
}

/// Get detailed information about a file.
pub fn stat(repo: &Repository, path: &str) -> Result<Option<FileEntry>> {
    let tip = repo.branch_tip_internal("trunk")?;
    let files = repo.list_files_internal(&tip.hash)?;

    for file in files {
        if file.name == path {
            let content = repo.read_file_internal(&tip.hash, path)?;
            let file_type = if let Ok(text) = String::from_utf8(content.clone()) {
                if text.starts_with("link ") {
                    FileType::Symlink(text[5..].trim().to_string())
                } else {
                    FileType::Regular
                }
            } else {
                FileType::Regular
            };

            return Ok(Some(FileEntry {
                path: file.name,
                hash: file.hash,
                file_type,
                permissions: file
                    .permissions
                    .as_ref()
                    .map(|p| Permissions::from_octal(u32::from_str_radix(p, 8).unwrap_or(0o644))),
                size: Some(content.len()),
            }));
        }
    }

    Ok(None)
}

/// Calculate total size of files matching a glob pattern.
pub fn du(repo: &Repository, pattern: &str) -> Result<usize> {
    let tip = repo.branch_tip_internal("trunk")?;
    let files = repo.find_files_internal(&tip.hash, pattern)?;
    let mut total = 0;

    for file in files {
        if let Ok(content) = repo.read_file_internal(&tip.hash, &file.name) {
            total += content.len();
        }
    }

    Ok(total)
}

/// List all symbolic links in the repository.
pub fn list_symlinks(repo: &Repository) -> Result<Vec<(String, String)>> {
    let tip = repo.branch_tip_internal("trunk")?;
    let files = repo.list_files_internal(&tip.hash)?;
    let mut symlinks = Vec::new();

    for file in files {
        if let Ok(content) = repo.read_file_internal(&tip.hash, &file.name) {
            if let Ok(text) = String::from_utf8(content) {
                if text.starts_with("link ") {
                    let target = text[5..].trim().to_string();
                    symlinks.push((file.name, target));
                }
            }
        }
    }

    Ok(symlinks)
}

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

    #[test]
    fn test_permissions_from_octal() {
        let perms = Permissions::from_octal(0o755);
        assert!(perms.owner_read);
        assert!(perms.owner_write);
        assert!(perms.owner_exec);
        assert!(perms.group_read);
        assert!(!perms.group_write);
        assert!(perms.group_exec);
        assert!(perms.other_read);
        assert!(!perms.other_write);
        assert!(perms.other_exec);
    }

    #[test]
    fn test_permissions_to_octal() {
        let perms = Permissions::from_octal(0o644);
        assert_eq!(perms.to_octal(), 0o644);
    }

    #[test]
    fn test_permissions_string_repr() {
        assert_eq!(Permissions::from_octal(0o755).to_string_repr(), "rwxr-xr-x");
        assert_eq!(Permissions::from_octal(0o644).to_string_repr(), "rw-r--r--");
        assert_eq!(Permissions::from_octal(0o600).to_string_repr(), "rw-------");
    }

    #[test]
    fn test_permissions_presets() {
        assert_eq!(Permissions::file().to_octal(), 0o644);
        assert_eq!(Permissions::executable().to_octal(), 0o755);
        assert_eq!(Permissions::readonly().to_octal(), 0o444);
    }

    #[test]
    fn test_permissions_roundtrip() {
        for mode in [0o000, 0o111, 0o222, 0o333, 0o444, 0o555, 0o666, 0o777] {
            let perms = Permissions::from_octal(mode);
            assert_eq!(perms.to_octal(), mode);
        }
    }

    #[test]
    fn test_permissions_all_bits() {
        let perms = Permissions::from_octal(0o777);
        assert!(perms.owner_read);
        assert!(perms.owner_write);
        assert!(perms.owner_exec);
        assert!(perms.group_read);
        assert!(perms.group_write);
        assert!(perms.group_exec);
        assert!(perms.other_read);
        assert!(perms.other_write);
        assert!(perms.other_exec);
        assert_eq!(perms.to_string_repr(), "rwxrwxrwx");
    }

    #[test]
    fn test_permissions_no_bits() {
        let perms = Permissions::from_octal(0o000);
        assert!(!perms.owner_read);
        assert!(!perms.owner_write);
        assert!(!perms.owner_exec);
        assert!(!perms.group_read);
        assert!(!perms.group_write);
        assert!(!perms.group_exec);
        assert!(!perms.other_read);
        assert!(!perms.other_write);
        assert!(!perms.other_exec);
        assert_eq!(perms.to_string_repr(), "---------");
    }

    #[test]
    fn test_file_type_equality() {
        assert_eq!(FileType::Regular, FileType::Regular);
        assert_eq!(FileType::Executable, FileType::Executable);
        assert_eq!(
            FileType::Symlink("target".to_string()),
            FileType::Symlink("target".to_string())
        );
        assert_ne!(FileType::Regular, FileType::Executable);
        assert_ne!(
            FileType::Symlink("a".to_string()),
            FileType::Symlink("b".to_string())
        );
    }

    #[test]
    fn test_find_result_empty() {
        let result = FindResult {
            files: vec![],
            count: 0,
            dirs_traversed: 0,
        };
        assert_eq!(result.count, 0);
        assert!(result.files.is_empty());
    }

    #[test]
    fn test_find_result_with_files() {
        let result = FindResult {
            files: vec![
                FileEntry {
                    path: "src/main.rs".to_string(),
                    hash: "abc123".to_string(),
                    file_type: FileType::Regular,
                    permissions: Some(Permissions::file()),
                    size: Some(100),
                },
                FileEntry {
                    path: "src/lib.rs".to_string(),
                    hash: "def456".to_string(),
                    file_type: FileType::Regular,
                    permissions: Some(Permissions::file()),
                    size: Some(200),
                },
            ],
            count: 2,
            dirs_traversed: 1,
        };
        assert_eq!(result.count, 2);
        assert_eq!(result.files.len(), 2);
        assert_eq!(result.dirs_traversed, 1);
    }

    #[test]
    fn test_file_entry_with_symlink() {
        let entry = FileEntry {
            path: "link".to_string(),
            hash: "hash".to_string(),
            file_type: FileType::Symlink("target/path".to_string()),
            permissions: None,
            size: None,
        };
        assert_eq!(entry.path, "link");
        if let FileType::Symlink(target) = entry.file_type {
            assert_eq!(target, "target/path");
        } else {
            panic!("Expected symlink");
        }
    }
}