agpm-cli 0.4.14

//! Common utilities and shared functionality for CLI commands.
//!
//! This module provides reusable infrastructure for install and update commands:
//!
//! # Core Components
//!
//! - **`CommandExecutor` trait**: Standardized command execution pattern
//! - **`CommandContext`**: Manifest and lockfile management utilities
//! - **`OperationMode` enum**: Distinguishes install vs update for shared logic
//!
//! # Shared Display Helpers
//!
//! - **`display_dry_run_results()`**: Rich dry-run output with CI exit codes
//! - **`display_no_changes()`**: Context-appropriate "no changes" messages
//!
//! # Legacy Support
//!
//! - **`handle_legacy_ccpm_migration()`**: CCPM to AGPM migration utilities
//! - **`check_for_legacy_ccpm_files()`**: Detects old CCPM installations
//!
//! # Lockfile Management
//!
//! - **`load_lockfile()`**: Loads lockfile with automatic regeneration
//! - **`save_lockfile()`**: Saves lockfile with error handling
//! - **`backup_and_regenerate_lockfile()`**: Recovery from corrupted lockfiles

use anyhow::{Context, Result};
use colored::Colorize;
use std::io::{self, IsTerminal, Write};
use std::path::{Path, PathBuf};
use tokio::io::{AsyncBufReadExt, BufReader};

use crate::manifest::{Manifest, find_manifest};

/// Common trait for CLI command execution pattern
pub trait CommandExecutor: Sized {
    /// Execute the command, finding the manifest automatically
    fn execute(self) -> impl std::future::Future<Output = Result<()>> + Send
    where
        Self: Send,
    {
        async move {
            let manifest_path = if let Ok(path) = find_manifest() {
                path
            } else {
                // Check if legacy CCPM files exist and offer interactive migration
                // Default to interactive mode (yes=false); commands with --yes flag
                // should use their own implementation
                match handle_legacy_ccpm_migration(None, false).await {
                    Ok(Some(path)) => path,
                    Ok(None) => {
                        return Err(anyhow::anyhow!(
                            "No agpm.toml found in current directory or any parent directory. \
                             Run 'agpm init' to create a new project."
                        ));
                    }
                    Err(e) => return Err(e),
                }
            };
            self.execute_from_path(manifest_path).await
        }
    }

    /// Execute the command with a specific manifest path
    fn execute_from_path(
        self,
        manifest_path: PathBuf,
    ) -> impl std::future::Future<Output = Result<()>> + Send;
}

/// Common context for CLI commands that need manifest and project information
#[derive(Debug)]
pub struct CommandContext {
    /// Parsed project manifest (agpm.toml)
    pub manifest: Manifest,
    /// Path to the manifest file
    pub manifest_path: PathBuf,
    /// Project root directory (containing agpm.toml)
    pub project_dir: PathBuf,
    /// Path to the lockfile (agpm.lock)
    pub lockfile_path: PathBuf,
}

impl CommandContext {
    /// Create a new command context from a manifest and project directory
    pub fn new(manifest: Manifest, project_dir: PathBuf) -> Result<Self> {
        let lockfile_path = project_dir.join("agpm.lock");
        Ok(Self {
            manifest,
            manifest_path: project_dir.join("agpm.toml"),
            project_dir,
            lockfile_path,
        })
    }

    /// Create a new command context from a manifest path
    ///
    /// # Errors
    /// Returns an error if the manifest file doesn't exist or cannot be read
    pub fn from_manifest_path(manifest_path: impl AsRef<Path>) -> Result<Self> {
        let manifest_path = manifest_path.as_ref();

        if !manifest_path.exists() {
            return Err(anyhow::anyhow!("Manifest file {} not found", manifest_path.display()));
        }

        let project_dir = manifest_path
            .parent()
            .ok_or_else(|| anyhow::anyhow!("Invalid manifest path"))?
            .to_path_buf();

        let manifest = Manifest::load(manifest_path).with_context(|| {
            format!("Failed to parse manifest file: {}", manifest_path.display())
        })?;

        let lockfile_path = project_dir.join("agpm.lock");

        Ok(Self {
            manifest,
            manifest_path: manifest_path.to_path_buf(),
            project_dir,
            lockfile_path,
        })
    }

    /// Reload the manifest from disk.
    ///
    /// This should be called after any operation that modifies the manifest file,
    /// such as migration updating the tools configuration.
    ///
    /// # Errors
    /// Returns an error if the manifest file cannot be loaded or parsed.
    pub fn reload_manifest(&mut self) -> Result<()> {
        self.manifest = Manifest::load(&self.manifest_path).with_context(|| {
            format!("Failed to reload manifest file: {}", self.manifest_path.display())
        })?;
        Ok(())
    }

    /// Load an existing lockfile if it exists
    ///
    /// # Errors
    /// Returns an error if the lockfile exists but cannot be parsed
    pub fn load_lockfile(&self) -> Result<Option<crate::lockfile::LockFile>> {
        if self.lockfile_path.exists() {
            let lockfile =
                crate::lockfile::LockFile::load(&self.lockfile_path).with_context(|| {
                    format!("Failed to load lockfile: {}", self.lockfile_path.display())
                })?;
            Ok(Some(lockfile))
        } else {
            Ok(None)
        }
    }

    /// Load an existing lockfile with automatic regeneration for invalid files
    ///
    /// If the lockfile exists but is invalid or corrupted, this method will
    /// offer to automatically regenerate it. This provides a better user
    /// experience by recovering from common lockfile issues.
    ///
    /// # Arguments
    ///
    /// * `can_regenerate` - Whether automatic regeneration should be offered
    /// * `operation_name` - Name of the operation for error messages (e.g., "list")
    ///
    /// # Returns
    ///
    /// * `Ok(Some(lockfile))` - Successfully loaded or regenerated lockfile
    /// * `Ok(None)` - No lockfile exists (not an error)
    /// * `Err` - Critical error that cannot be recovered from
    ///
    /// # Behavior
    ///
    /// - **Interactive mode** (TTY): Prompts user with Y/n confirmation
    /// - **Non-interactive mode** (CI/CD): Fails with helpful error message
    /// - **Backup strategy**: Copies invalid lockfile to `agpm.lock.invalid` before regeneration
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # use anyhow::Result;
    /// # use agpm_cli::cli::common::CommandContext;
    /// # use agpm_cli::manifest::Manifest;
    /// # use std::path::PathBuf;
    /// # async fn example() -> Result<()> {
    /// let manifest = Manifest::load(&PathBuf::from("agpm.toml"))?;
    /// let project_dir = PathBuf::from(".");
    /// let ctx = CommandContext::new(manifest, project_dir)?;
    /// match ctx.load_lockfile_with_regeneration(true, "list") {
    ///     Ok(Some(lockfile)) => println!("Loaded lockfile"),
    ///     Ok(None) => println!("No lockfile found"),
    ///     Err(e) => eprintln!("Error: {}", e),
    /// }
    /// # Ok(())
    /// # }
    /// ```
    pub fn load_lockfile_with_regeneration(
        &self,
        can_regenerate: bool,
        operation_name: &str,
    ) -> Result<Option<crate::lockfile::LockFile>> {
        // If lockfile doesn't exist, that's not an error
        if !self.lockfile_path.exists() {
            return Ok(None);
        }

        // Try to load the lockfile
        match crate::lockfile::LockFile::load(&self.lockfile_path) {
            Ok(mut lockfile) => {
                // Also load and merge private lockfile if it exists
                if let Ok(Some(private_lock)) =
                    crate::lockfile::PrivateLockFile::load(&self.project_dir)
                {
                    lockfile.merge_private(&private_lock);
                }
                // If private lockfile fails to load or doesn't exist, we just skip it
                // (it could be corrupted or from a different version)
                Ok(Some(lockfile))
            }
            Err(e) => {
                // Analyze the error to see if it's recoverable
                let error_msg = e.to_string();
                let can_auto_recover = can_regenerate
                    && (error_msg.contains("Invalid TOML syntax")
                        || error_msg.contains("Lockfile version")
                        || error_msg.contains("missing field")
                        || error_msg.contains("invalid type")
                        || error_msg.contains("expected"));

                if !can_auto_recover {
                    // Not a recoverable error, return the original error
                    return Err(e);
                }

                // This is a recoverable error, offer regeneration
                let backup_path = self.lockfile_path.with_extension("lock.invalid");

                // Create user-friendly message
                let regenerate_message = format!(
                    "The lockfile appears to be invalid or corrupted.\n\n\
                     Error: {}\n\n\
                     Note: The lockfile format is not yet stable as this is beta software.\n\n\
                     The invalid lockfile will be backed up to: {}",
                    error_msg,
                    backup_path.display()
                );

                // Check if we're in interactive mode
                if io::stdin().is_terminal() {
                    // Interactive mode: prompt user
                    println!("{}", regenerate_message);
                    print!("Would you like to regenerate the lockfile automatically? [Y/n] ");
                    // Unwrap justified: stdout flush only fails on catastrophic OS errors
                    io::stdout().flush().unwrap();

                    let mut input = String::new();
                    match io::stdin().read_line(&mut input) {
                        Ok(_) => {
                            let response = input.trim().to_lowercase();
                            if response.is_empty() || response == "y" || response == "yes" {
                                // User agreed to regenerate
                                self.backup_and_regenerate_lockfile(&backup_path, operation_name)?;
                                Ok(None) // Return None so caller creates new lockfile
                            } else {
                                // User declined, return the original error
                                Err(crate::core::AgpmError::InvalidLockfileError {
                                    file: self.lockfile_path.display().to_string(),
                                    reason: format!(
                                        "{} (User declined automatic regeneration)",
                                        error_msg
                                    ),
                                    can_regenerate: true,
                                }
                                .into())
                            }
                        }
                        Err(_) => {
                            // Failed to read input, fall back to non-interactive behavior
                            Err(self.create_non_interactive_error(&error_msg, operation_name))
                        }
                    }
                } else {
                    // Non-interactive mode: fail with helpful message
                    Err(self.create_non_interactive_error(&error_msg, operation_name))
                }
            }
        }
    }

    /// Backup the invalid lockfile and display regeneration instructions
    fn backup_and_regenerate_lockfile(
        &self,
        backup_path: &Path,
        operation_name: &str,
    ) -> Result<()> {
        // Backup the invalid lockfile
        if let Err(e) = std::fs::copy(&self.lockfile_path, backup_path) {
            eprintln!("Warning: Failed to backup invalid lockfile: {}", e);
        } else {
            println!("✓ Backed up invalid lockfile to: {}", backup_path.display());
        }

        // Remove the invalid lockfile
        if let Err(e) = std::fs::remove_file(&self.lockfile_path) {
            return Err(anyhow::anyhow!("Failed to remove invalid lockfile: {}", e));
        }

        println!("✓ Removed invalid lockfile");
        println!("Note: Run 'agpm install' to regenerate the lockfile");

        // If this is not an install command, suggest running install
        if operation_name != "install" {
            println!("Alternatively, run 'agpm {} --regenerate' if available", operation_name);
        }

        Ok(())
    }

    /// Create a non-interactive error message for CI/CD environments
    fn create_non_interactive_error(
        &self,
        error_msg: &str,
        _operation_name: &str,
    ) -> anyhow::Error {
        let backup_path = self.lockfile_path.with_extension("lock.invalid");

        crate::core::AgpmError::InvalidLockfileError {
            file: self.lockfile_path.display().to_string(),
            reason: format!(
                "{}\n\n\
                 To fix this issue:\n\
                 1. Backup the invalid lockfile: cp agpm.lock {}\n\
                 2. Remove the invalid lockfile: rm agpm.lock\n\
                 3. Regenerate it: agpm install\n\n\
                 Note: The lockfile format is not yet stable as this is beta software.",
                error_msg,
                backup_path.display()
            ),
            can_regenerate: true,
        }
        .into()
    }

    /// Save a lockfile to the project directory
    ///
    /// # Errors
    /// Returns an error if the lockfile cannot be written
    pub fn save_lockfile(&self, lockfile: &crate::lockfile::LockFile) -> Result<()> {
        lockfile
            .save(&self.lockfile_path)
            .with_context(|| format!("Failed to save lockfile: {}", self.lockfile_path.display()))
    }
}

/// Handle legacy CCPM files by offering interactive migration.
///
/// This function searches for ccpm.toml and ccpm.lock files in the current
/// directory and parent directories. If found, it prompts the user to migrate
/// and performs the migration if they accept.
///
/// # Behavior
///
/// - **Interactive mode**: Prompts user with Y/n confirmation (stdin is a TTY)
/// - **Non-interactive mode**: Returns `Ok(None)` if stdin is not a TTY (e.g., CI/CD)
/// - **Auto-accept mode**: When `yes` is true, accepts migration without prompting
/// - **Search scope**: Traverses from current directory to filesystem root
///
/// # Arguments
///
/// * `from_dir` - Optional starting directory for the search
/// * `yes` - When true, automatically accept migration prompts without user interaction
///
/// # Returns
///
/// - `Ok(Some(PathBuf))` with the path to agpm.toml if migration succeeded
/// - `Ok(None)` if no legacy files were found OR user declined OR non-interactive mode
/// - `Err` if migration failed
///
/// # Examples
///
/// ```no_run
/// # use anyhow::Result;
/// # async fn example() -> Result<()> {
/// use agpm_cli::cli::common::handle_legacy_ccpm_migration;
///
/// // Interactive mode
/// match handle_legacy_ccpm_migration(None, false).await? {
///     Some(path) => println!("Migrated to: {}", path.display()),
///     None => println!("No migration performed"),
/// }
///
/// // Auto-accept mode (for CI/scripts)
/// match handle_legacy_ccpm_migration(None, true).await? {
///     Some(path) => println!("Migrated to: {}", path.display()),
///     None => println!("No legacy files found"),
/// }
/// # Ok(())
/// # }
/// ```
///
/// # Errors
///
/// Returns an error if:
/// - Unable to access current directory (when `from_dir` is None)
/// - Unable to perform migration operations
pub async fn handle_legacy_ccpm_migration(
    from_dir: Option<PathBuf>,
    yes: bool,
) -> Result<Option<PathBuf>> {
    let current_dir = match from_dir {
        Some(dir) => dir,
        None => std::env::current_dir()?,
    };
    let legacy_dir = find_legacy_ccpm_directory(&current_dir);

    let Some(dir) = legacy_dir else {
        return Ok(None);
    };

    // Check if we're in an interactive terminal (unless --yes flag is set)
    if !yes && !std::io::stdin().is_terminal() {
        // Non-interactive mode: Don't prompt, just inform and exit
        eprintln!("{}", "Legacy CCPM files detected (non-interactive mode).".yellow());
        eprintln!(
            "Run {} to migrate manually, or use --yes to auto-accept.",
            format!("agpm migrate --path {}", dir.display()).cyan()
        );
        return Ok(None);
    }

    // Found legacy files - prompt for migration (or auto-accept if --yes)
    let ccpm_toml = dir.join("ccpm.toml");
    let ccpm_lock = dir.join("ccpm.lock");

    let mut files = Vec::new();
    if ccpm_toml.exists() {
        files.push("ccpm.toml");
    }
    if ccpm_lock.exists() {
        files.push("ccpm.lock");
    }

    let files_str = files.join(" and ");

    println!("{}", "Legacy CCPM files detected!".yellow().bold());
    println!("{} {} found in {}", "→".cyan(), files_str, dir.display());
    println!();

    // Auto-accept if --yes flag is set, otherwise prompt
    let should_migrate = if yes {
        true
    } else {
        // Prompt user for migration
        print!("{} ", "Would you like to migrate to AGPM now? [Y/n]:".green());
        io::stdout().flush()?;

        // Use async I/O for proper integration with Tokio runtime
        let mut reader = BufReader::new(tokio::io::stdin());
        let mut response = String::new();
        reader.read_line(&mut response).await?;
        let response = response.trim().to_lowercase();
        response.is_empty() || response == "y" || response == "yes"
    };

    if should_migrate {
        println!();
        println!("{}", "🚀 Starting migration...".cyan());

        // Perform the migration with automatic installation
        let migrate_cmd = super::migrate::MigrateCommand::new(Some(dir.clone()), false, false);

        migrate_cmd.execute().await?;

        // Return the path to the newly created agpm.toml
        Ok(Some(dir.join("agpm.toml")))
    } else {
        println!();
        println!("{}", "Migration cancelled.".yellow());
        println!(
            "Run {} to migrate manually.",
            format!("agpm migrate --path {}", dir.display()).cyan()
        );
        Ok(None)
    }
}

/// Handle legacy format migration (old gitignore-managed → agpm/ subdirectory).
///
/// This function detects if a project has resources at old paths (not in agpm/
/// subdirectory) and offers interactive migration to the new format.
///
/// # Behavior
///
/// - **Interactive mode**: Prompts user with Y/n confirmation (stdin is a TTY)
/// - **Non-interactive mode**: Returns `Ok(false)` if stdin is not a TTY (e.g., CI/CD)
/// - **Auto-accept mode**: When `yes` is true, accepts migration without prompting
/// - **Detection**: Uses lockfile to identify AGPM-managed files at old paths
///
/// # Arguments
///
/// * `project_dir` - Path to the project directory
/// * `yes` - When true, automatically accept migration prompts without user interaction
///
/// # Returns
///
/// - `Ok(true)` if migration was performed
/// - `Ok(false)` if no migration needed OR user declined OR non-interactive mode
/// - `Err` if migration failed
///
/// # Examples
///
/// ```no_run
/// # use anyhow::Result;
/// # async fn example() -> Result<()> {
/// use agpm_cli::cli::common::handle_legacy_format_migration;
/// use std::path::Path;
///
/// // Interactive mode
/// let migrated = handle_legacy_format_migration(Path::new("."), false).await?;
/// if migrated {
///     println!("Format migration complete!");
/// }
///
/// // Auto-accept mode (for CI/scripts)
/// let migrated = handle_legacy_format_migration(Path::new("."), true).await?;
/// # Ok(())
/// # }
/// ```
pub async fn handle_legacy_format_migration(project_dir: &Path, yes: bool) -> Result<bool> {
    use super::migrate::{detect_old_format, run_format_migration};

    let detection = detect_old_format(project_dir);

    if !detection.needs_migration() {
        return Ok(false);
    }

    // Check if we're in an interactive terminal (unless --yes flag is set)
    if !yes && !std::io::stdin().is_terminal() {
        // Non-interactive mode: Don't prompt, just inform
        eprintln!("{}", "Legacy AGPM format detected (non-interactive mode).".yellow());
        eprintln!(
            "Run {} to migrate manually, or use --yes to auto-accept.",
            format!("agpm migrate --path {}", project_dir.display()).cyan()
        );
        return Ok(false);
    }

    // Show what was detected
    println!("{}", "Legacy AGPM format detected!".yellow().bold());

    if !detection.old_resource_paths.is_empty() {
        println!(
            "\n{} Found {} resources at old paths:",
            "→".cyan(),
            detection.old_resource_paths.len()
        );
        for path in &detection.old_resource_paths {
            let rel = path.strip_prefix(project_dir).unwrap_or(path);
            println!("    • {}", rel.display());
        }
    }

    if detection.has_managed_gitignore_section {
        println!("\n{} Found AGPM/CCPM managed section in .gitignore", "→".cyan());
    }

    println!();
    println!(
        "{}",
        "The new format uses agpm/ subdirectories for easier gitignore management.".dimmed()
    );
    println!();

    // Auto-accept if --yes flag is set, otherwise prompt
    let should_migrate = if yes {
        true
    } else {
        // Prompt user for migration
        print!("{} ", "Would you like to migrate to the new format now? [Y/n]:".green());
        io::stdout().flush()?;

        // Use async I/O for proper integration with Tokio runtime
        let mut reader = BufReader::new(tokio::io::stdin());
        let mut response = String::new();
        reader.read_line(&mut response).await?;
        let response = response.trim().to_lowercase();
        response.is_empty() || response == "y" || response == "yes"
    };

    if should_migrate {
        println!();
        run_format_migration(project_dir).await?;
        Ok(true)
    } else {
        println!();
        println!("{}", "Migration cancelled.".yellow());
        println!(
            "Run {} to migrate manually.",
            format!("agpm migrate --path {}", project_dir.display()).cyan()
        );
        Ok(false)
    }
}

/// Check for legacy CCPM files and return a migration message if found.
///
/// This function searches for ccpm.toml and ccpm.lock files in the current
/// directory and parent directories, similar to how `find_manifest` works.
/// If legacy files are found, it returns a helpful error message suggesting
/// to run the migration command.
///
/// # Returns
///
/// - `Some(String)` with migration instructions if legacy files are found
/// - `None` if no legacy files are detected
#[must_use]
pub fn check_for_legacy_ccpm_files() -> Option<String> {
    check_for_legacy_ccpm_files_from(std::env::current_dir().ok()?)
}

/// Find the directory containing legacy CCPM files.
///
/// Searches for ccpm.toml or ccpm.lock starting from the given directory
/// and walking up the directory tree.
///
/// # Returns
///
/// - `Some(PathBuf)` with the directory containing legacy files
/// - `None` if no legacy files are found
fn find_legacy_ccpm_directory(start_dir: &Path) -> Option<PathBuf> {
    let mut dir = start_dir;

    loop {
        let ccpm_toml = dir.join("ccpm.toml");
        let ccpm_lock = dir.join("ccpm.lock");

        if ccpm_toml.exists() || ccpm_lock.exists() {
            return Some(dir.to_path_buf());
        }

        dir = dir.parent()?;
    }
}

/// Check for legacy CCPM files starting from a specific directory.
///
/// This is the internal implementation that allows for testing without
/// changing the current working directory.
fn check_for_legacy_ccpm_files_from(start_dir: PathBuf) -> Option<String> {
    let current = start_dir;
    let mut dir = current.as_path();

    loop {
        let ccpm_toml = dir.join("ccpm.toml");
        let ccpm_lock = dir.join("ccpm.lock");

        if ccpm_toml.exists() || ccpm_lock.exists() {
            let mut files = Vec::new();
            if ccpm_toml.exists() {
                files.push("ccpm.toml");
            }
            if ccpm_lock.exists() {
                files.push("ccpm.lock");
            }

            let files_str = files.join(" and ");
            let location = if dir == current {
                "current directory".to_string()
            } else {
                format!("parent directory: {}", dir.display())
            };

            return Some(format!(
                "{}\n\n{} {} found in {}.\n{}\n  {}\n\n{}",
                "Legacy CCPM files detected!".yellow().bold(),
                "→".cyan(),
                files_str,
                location,
                "Run the migration command to upgrade:".yellow(),
                format!("agpm migrate --path {}", dir.display()).cyan().bold(),
                "Or run 'agpm init' to create a new AGPM project.".dimmed()
            ));
        }

        dir = dir.parent()?;
    }
}

/// Determines the type of operation being performed for user-facing messages.
///
/// This enum distinguishes between install and update operations to provide
/// appropriate feedback messages and exit codes. Used by shared helper functions
/// like `display_dry_run_results()` and `display_no_changes()` to customize
/// behavior based on the operation context.
///
/// # Examples
///
/// ```rust
/// use agpm_cli::cli::common::OperationMode;
///
/// let mode = OperationMode::Install;
/// // Used to determine appropriate "no changes" message:
/// // Install: "No dependencies to install"
/// // Update: "All dependencies are up to date!"
/// ```
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum OperationMode {
    /// Fresh installation operation (agpm install)
    Install,
    /// Dependency update operation (agpm update)
    Update,
}

/// Display dry-run results with rich categorization of changes.
///
/// Shows new resources, updated resources, and unchanged count.
/// **IMPORTANT**: Returns an error (exit code 1) if changes are detected,
/// making this suitable for CI validation workflows.
///
/// # Arguments
///
/// * `new_lockfile` - The lockfile that would be created
/// * `existing_lockfile` - The current lockfile if it exists
/// * `quiet` - Whether to suppress output
///
/// # Returns
///
/// * `Ok(())` - No changes detected (exit code 0)
/// * `Err(...)` - Changes detected (exit code 1 for CI validation)
///
/// # CI/CD Usage
///
/// This function is designed for CI validation workflows where you want
/// to detect if running install/update would make changes:
///
/// ```bash
/// # CI pipeline check - fails if dependencies need updating
/// agpm install --dry-run  # Exit code 1 if changes needed
/// agpm update --dry-run   # Exit code 1 if updates available
/// ```
///
/// # Examples
///
/// ```no_run
/// # use anyhow::Result;
/// # use agpm_cli::cli::common::display_dry_run_results;
/// # use agpm_cli::lockfile::LockFile;
/// # fn example() -> Result<()> {
/// let new_lockfile = LockFile::new();
/// let existing_lockfile = None;
///
/// // In CI: this will return Err if changes detected
/// display_dry_run_results(
///     &new_lockfile,
///     existing_lockfile.as_ref(),
///     false,
/// )?;
/// # Ok(())
/// # }
/// ```
///
/// # Output Format
///
/// When changes are detected, displays:
/// - **New resources**: Resources that would be installed (green)
/// - **Updated resources**: Resources that would be updated (yellow)
/// - **Unchanged count**: Resources that are already up to date (dimmed)
pub fn display_dry_run_results(
    new_lockfile: &crate::lockfile::LockFile,
    existing_lockfile: Option<&crate::lockfile::LockFile>,
    quiet: bool,
) -> Result<()> {
    // 1. Categorize changes
    let (new_resources, updated_resources, unchanged_count) =
        categorize_resource_changes(new_lockfile, existing_lockfile);

    // 2. Display results
    let has_changes = !new_resources.is_empty() || !updated_resources.is_empty();
    display_dry_run_output(&new_resources, &updated_resources, unchanged_count, quiet);

    // 3. Return CI exit code
    if has_changes {
        Err(anyhow::anyhow!("Dry-run detected changes (exit 1)"))
    } else {
        Ok(())
    }
}

/// Represents a new resource to be installed.
#[derive(Debug, Clone)]
struct NewResource {
    resource_type: String,
    name: String,
    version: String,
}

/// Represents a resource being updated.
#[derive(Debug, Clone)]
struct UpdatedResource {
    resource_type: String,
    name: String,
    old_version: String,
    new_version: String,
}

/// Categorize resources into new, updated, and unchanged.
///
/// Compares a new lockfile against an existing lockfile to determine what has changed.
/// Returns tuple of (new_resources, updated_resources, unchanged_count).
fn categorize_resource_changes(
    new_lockfile: &crate::lockfile::LockFile,
    existing_lockfile: Option<&crate::lockfile::LockFile>,
) -> (Vec<NewResource>, Vec<UpdatedResource>, usize) {
    use crate::core::resource_iterator::ResourceIterator;

    let mut new_resources = Vec::new();
    let mut updated_resources = Vec::new();
    let mut unchanged_count = 0;

    // Compare lockfiles to find changes
    if let Some(existing) = existing_lockfile {
        ResourceIterator::for_each_resource(new_lockfile, |resource_type, new_entry| {
            // Find corresponding entry in existing lockfile
            if let Some((_, old_entry)) = ResourceIterator::find_resource_by_name_and_source(
                existing,
                &new_entry.name,
                new_entry.source.as_deref(),
            ) {
                // Check if it was updated
                if old_entry.resolved_commit == new_entry.resolved_commit {
                    unchanged_count += 1;
                } else {
                    let old_version =
                        old_entry.version.clone().unwrap_or_else(|| "latest".to_string());
                    let new_version =
                        new_entry.version.clone().unwrap_or_else(|| "latest".to_string());
                    updated_resources.push(UpdatedResource {
                        resource_type: resource_type.to_string(),
                        name: new_entry.name.clone(),
                        old_version,
                        new_version,
                    });
                }
            } else {
                // New resource
                new_resources.push(NewResource {
                    resource_type: resource_type.to_string(),
                    name: new_entry.name.clone(),
                    version: new_entry.version.clone().unwrap_or_else(|| "latest".to_string()),
                });
            }
        });
    } else {
        // No existing lockfile, everything is new
        ResourceIterator::for_each_resource(new_lockfile, |resource_type, new_entry| {
            new_resources.push(NewResource {
                resource_type: resource_type.to_string(),
                name: new_entry.name.clone(),
                version: new_entry.version.clone().unwrap_or_else(|| "latest".to_string()),
            });
        });
    }

    (new_resources, updated_resources, unchanged_count)
}

/// Format and display dry-run results.
///
/// Displays new resources, updated resources, and unchanged count with rich formatting.
/// Shows nothing if quiet mode is enabled.
fn display_dry_run_output(
    new_resources: &[NewResource],
    updated_resources: &[UpdatedResource],
    unchanged_count: usize,
    quiet: bool,
) {
    if quiet {
        return;
    }

    let has_changes = !new_resources.is_empty() || !updated_resources.is_empty();

    if has_changes {
        println!("{}", "Dry run - the following changes would be made:".yellow());
        println!();

        if !new_resources.is_empty() {
            println!("{}", "New resources:".green().bold());
            for resource in new_resources {
                println!(
                    "  {} {} ({})",
                    "+".green(),
                    resource.name.cyan(),
                    format!("{} {}", resource.resource_type, resource.version).dimmed()
                );
            }
            println!();
        }

        if !updated_resources.is_empty() {
            println!("{}", "Updated resources:".yellow().bold());
            for resource in updated_resources {
                print!(
                    "  {} {} {} → ",
                    "~".yellow(),
                    resource.name.cyan(),
                    resource.old_version.yellow()
                );
                println!("{} ({})", resource.new_version.green(), resource.resource_type.dimmed());
            }
            println!();
        }

        if unchanged_count > 0 {
            println!("{}", format!("{unchanged_count} unchanged resources").dimmed());
        }

        println!();
        println!(
            "{}",
            format!(
                "Total: {} new, {} updated, {} unchanged",
                new_resources.len(),
                updated_resources.len(),
                unchanged_count
            )
            .bold()
        );
        println!();
        println!("{}", "No files were modified (dry-run mode)".yellow());
    } else {
        println!("✓ {}", "No changes would be made".green());
    }
}

/// Display "no changes" message appropriate for the operation mode.
///
/// Shows a message indicating no changes were made, with different messages
/// depending on whether this was an install or update operation.
///
/// # Arguments
///
/// * `mode` - The operation mode (install or update)
/// * `quiet` - Whether to suppress output
///
/// # Examples
///
/// ```no_run
/// use agpm_cli::cli::common::{display_no_changes, OperationMode};
///
/// display_no_changes(OperationMode::Install, false);
/// display_no_changes(OperationMode::Update, false);
/// ```
pub fn display_no_changes(mode: OperationMode, quiet: bool) {
    if quiet {
        return;
    }

    match mode {
        OperationMode::Install => println!("No dependencies to install"),
        OperationMode::Update => println!("All dependencies are up to date!"),
    }
}

/// Handle missing gitignore entries by offering to add them interactively.
///
/// When missing gitignore entries are detected, this function offers to add
/// the standard AGPM managed paths section to the project's `.gitignore` file.
/// It follows the same interactive pattern as the legacy migration handlers.
///
/// # Behavior
///
/// - **Interactive mode** (TTY): Prompts user with Y/n confirmation
/// - **Non-interactive mode** (CI/CD): Prints warning and returns
/// - **Auto-accept mode**: When `yes` is true, adds entries without prompting
///
/// # Arguments
///
/// * `validation` - The `ConfigValidation` result containing missing entries
/// * `project_dir` - Path to the project directory
/// * `yes` - When true, automatically accept without prompting
///
/// # Returns
///
/// - `Ok(true)` if entries were added successfully
/// - `Ok(false)` if no entries were added (user declined, non-interactive, or empty)
/// - `Err` if write operation failed
///
/// # Examples
///
/// ```no_run
/// # use anyhow::Result;
/// # async fn example() -> Result<()> {
/// use agpm_cli::cli::common::handle_missing_gitignore_entries;
/// use agpm_cli::installer::ConfigValidation;
/// use std::path::Path;
///
/// let validation = ConfigValidation::default();
///
/// // Interactive mode
/// let added = handle_missing_gitignore_entries(&validation, Path::new("."), false).await?;
///
/// // Auto-accept mode (for CI/scripts with --yes flag)
/// let added = handle_missing_gitignore_entries(&validation, Path::new("."), true).await?;
/// # Ok(())
/// # }
/// ```
pub async fn handle_missing_gitignore_entries(
    validation: &crate::installer::ConfigValidation,
    project_dir: &Path,
    yes: bool,
) -> Result<bool> {
    use super::migrate::{AGPM_MANAGED_PATHS, AGPM_MANAGED_PATHS_END};
    use tokio::io::AsyncWriteExt;

    // Early return if no missing entries
    if validation.missing_gitignore_entries.is_empty() {
        return Ok(false);
    }

    let missing = &validation.missing_gitignore_entries;
    let gitignore_path = project_dir.join(".gitignore");

    // Check if managed section already exists (avoid duplicates)
    if gitignore_path.exists() {
        if let Ok(content) = tokio::fs::read_to_string(&gitignore_path).await {
            if content.contains(AGPM_MANAGED_PATHS) {
                // Section exists but validation still found missing entries
                // This means user has partial entries - just warn, don't modify
                eprintln!("\n{}", "Warning: Missing gitignore entries detected:".yellow());
                for entry in missing {
                    eprintln!("  {}", entry);
                }
                eprintln!(
                    "\nThe {} section exists but may need manual updates.",
                    AGPM_MANAGED_PATHS.cyan()
                );
                return Ok(false);
            }
        }
    }

    // Check if we're in an interactive terminal (unless --yes flag is set)
    if !yes && !std::io::stdin().is_terminal() {
        // Non-interactive mode: print warning and return
        eprintln!("\n{}", "Missing gitignore entries detected:".yellow());
        for entry in missing {
            eprintln!("  {}", entry);
        }
        eprintln!("\nRun with {} to add them automatically, or add manually.", "--yes".cyan());
        return Ok(false);
    }

    // Show what we found
    println!("\n{}", "Missing .gitignore entries detected:".yellow().bold());
    for entry in missing {
        println!("  {} {}", "→".cyan(), entry);
    }
    println!();

    // Auto-accept if --yes flag is set, otherwise prompt
    let should_add = if yes {
        true
    } else {
        print!("{} ", "Would you like to add them now? [Y/n]:".green());
        io::stdout().flush()?;

        let mut reader = BufReader::new(tokio::io::stdin());
        let mut response = String::new();
        reader.read_line(&mut response).await?;
        let response = response.trim().to_lowercase();
        response.is_empty() || response == "y" || response == "yes"
    };

    if !should_add {
        println!("{}", "Skipped adding gitignore entries.".yellow());
        return Ok(false);
    }

    // Build the managed section content
    let mut content = String::new();

    // Add newline separator if appending to existing file
    if gitignore_path.exists() {
        let existing = tokio::fs::read_to_string(&gitignore_path).await.unwrap_or_default();
        if !existing.is_empty() && !existing.ends_with('\n') {
            content.push('\n');
        }
        content.push('\n');
    }

    content.push_str(AGPM_MANAGED_PATHS);
    content.push('\n');
    content.push_str(".claude/*/agpm/\n");
    content.push_str(".opencode/*/agpm/\n");
    content.push_str(".agpm/\n");
    content.push_str("agpm.private.toml\n");
    content.push_str("agpm.private.lock\n");
    content.push_str(AGPM_MANAGED_PATHS_END);
    content.push('\n');

    // Append to .gitignore (creates if doesn't exist)
    let mut file = tokio::fs::OpenOptions::new()
        .create(true)
        .append(true)
        .open(&gitignore_path)
        .await
        .context("Failed to open .gitignore for writing")?;

    file.write_all(content.as_bytes()).await.context("Failed to write to .gitignore")?;

    // Ensure data is flushed to disk
    file.sync_all().await.context("Failed to sync .gitignore")?;

    println!("{} Added AGPM managed paths section to .gitignore", "✓".green());

    Ok(true)
}

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

    #[test]
    fn test_command_context_from_manifest_path() {
        let temp_dir = TempDir::new().unwrap();
        let manifest_path = temp_dir.path().join("agpm.toml");

        // Create a test manifest
        std::fs::write(
            &manifest_path,
            r#"
[sources]
test = "https://github.com/test/repo.git"

[agents]
"#,
        )
        .unwrap();

        let context = CommandContext::from_manifest_path(&manifest_path).unwrap();

        assert_eq!(context.manifest_path, manifest_path);
        assert_eq!(context.project_dir, temp_dir.path());
        assert_eq!(context.lockfile_path, temp_dir.path().join("agpm.lock"));
        assert!(context.manifest.sources.contains_key("test"));
    }

    #[test]
    fn test_command_context_missing_manifest() {
        let result = CommandContext::from_manifest_path("/nonexistent/agpm.toml");
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("not found"));
    }

    #[test]
    fn test_command_context_invalid_manifest() {
        let temp_dir = TempDir::new().unwrap();
        let manifest_path = temp_dir.path().join("agpm.toml");

        // Create an invalid manifest
        std::fs::write(&manifest_path, "invalid toml {{").unwrap();

        let result = CommandContext::from_manifest_path(&manifest_path);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("Failed to parse manifest"));
    }

    #[test]
    fn test_load_lockfile_exists() {
        let temp_dir = TempDir::new().unwrap();
        let manifest_path = temp_dir.path().join("agpm.toml");
        let lockfile_path = temp_dir.path().join("agpm.lock");

        // Create test files
        std::fs::write(&manifest_path, "[sources]\n").unwrap();
        std::fs::write(
            &lockfile_path,
            r#"
version = 1

[[sources]]
name = "test"
url = "https://github.com/test/repo.git"
commit = "abc123"
fetched_at = "2024-01-01T00:00:00Z"
"#,
        )
        .unwrap();

        let context = CommandContext::from_manifest_path(&manifest_path).unwrap();
        let lockfile = context.load_lockfile().unwrap();

        assert!(lockfile.is_some());
        let lockfile = lockfile.unwrap();
        assert_eq!(lockfile.sources.len(), 1);
        assert_eq!(lockfile.sources[0].name, "test");
    }

    #[test]
    fn test_load_lockfile_not_exists() {
        let temp_dir = TempDir::new().unwrap();
        let manifest_path = temp_dir.path().join("agpm.toml");

        std::fs::write(&manifest_path, "[sources]\n").unwrap();

        let context = CommandContext::from_manifest_path(&manifest_path).unwrap();
        let lockfile = context.load_lockfile().unwrap();

        assert!(lockfile.is_none());
    }

    #[test]
    fn test_save_lockfile() {
        let temp_dir = TempDir::new().unwrap();
        let manifest_path = temp_dir.path().join("agpm.toml");

        std::fs::write(&manifest_path, "[sources]\n").unwrap();

        let context = CommandContext::from_manifest_path(&manifest_path).unwrap();

        let lockfile = crate::lockfile::LockFile {
            version: 1,
            sources: vec![],
            agents: vec![],
            snippets: vec![],
            commands: vec![],
            scripts: vec![],
            hooks: vec![],
            mcp_servers: vec![],
            skills: vec![],
            manifest_hash: None,
            has_mutable_deps: None,
            resource_count: None,
        };

        context.save_lockfile(&lockfile).unwrap();

        assert!(context.lockfile_path.exists());
        let saved_content = std::fs::read_to_string(&context.lockfile_path).unwrap();
        assert!(saved_content.contains("version = 1"));
    }

    #[test]
    fn test_check_for_legacy_ccpm_no_files() {
        let temp_dir = TempDir::new().unwrap();
        let result = check_for_legacy_ccpm_files_from(temp_dir.path().to_path_buf());
        assert!(result.is_none());
    }

    #[test]
    fn test_check_for_legacy_ccpm_toml_only() {
        let temp_dir = TempDir::new().unwrap();
        std::fs::write(temp_dir.path().join("ccpm.toml"), "[sources]\n").unwrap();

        let result = check_for_legacy_ccpm_files_from(temp_dir.path().to_path_buf());
        assert!(result.is_some());
        let msg = result.unwrap();
        assert!(msg.contains("Legacy CCPM files detected"));
        assert!(msg.contains("ccpm.toml"));
        assert!(msg.contains("agpm migrate"));
    }

    #[test]
    fn test_check_for_legacy_ccpm_lock_only() {
        let temp_dir = TempDir::new().unwrap();
        std::fs::write(temp_dir.path().join("ccpm.lock"), "# lock\n").unwrap();

        let result = check_for_legacy_ccpm_files_from(temp_dir.path().to_path_buf());
        assert!(result.is_some());
        let msg = result.unwrap();
        assert!(msg.contains("ccpm.lock"));
    }

    #[test]
    fn test_check_for_legacy_ccpm_both_files() {
        let temp_dir = TempDir::new().unwrap();
        std::fs::write(temp_dir.path().join("ccpm.toml"), "[sources]\n").unwrap();
        std::fs::write(temp_dir.path().join("ccpm.lock"), "# lock\n").unwrap();

        let result = check_for_legacy_ccpm_files_from(temp_dir.path().to_path_buf());
        assert!(result.is_some());
        let msg = result.unwrap();
        assert!(msg.contains("ccpm.toml and ccpm.lock"));
    }

    #[test]
    fn test_find_legacy_ccpm_directory_no_files() {
        let temp_dir = TempDir::new().unwrap();
        let result = find_legacy_ccpm_directory(temp_dir.path());
        assert!(result.is_none());
    }

    #[test]
    fn test_find_legacy_ccpm_directory_in_current_dir() {
        let temp_dir = TempDir::new().unwrap();
        std::fs::write(temp_dir.path().join("ccpm.toml"), "[sources]\n").unwrap();

        let result = find_legacy_ccpm_directory(temp_dir.path());
        assert!(result.is_some());
        assert_eq!(result.unwrap(), temp_dir.path());
    }

    #[test]
    fn test_find_legacy_ccpm_directory_in_parent() {
        let temp_dir = TempDir::new().unwrap();
        let parent = temp_dir.path();
        let child = parent.join("subdir");
        std::fs::create_dir(&child).unwrap();

        // Create legacy file in parent
        std::fs::write(parent.join("ccpm.toml"), "[sources]\n").unwrap();

        // Search from child directory
        let result = find_legacy_ccpm_directory(&child);
        assert!(result.is_some());
        assert_eq!(result.unwrap(), parent);
    }

    #[test]
    fn test_find_legacy_ccpm_directory_finds_lock_file() {
        let temp_dir = TempDir::new().unwrap();
        std::fs::write(temp_dir.path().join("ccpm.lock"), "# lock\n").unwrap();

        let result = find_legacy_ccpm_directory(temp_dir.path());
        assert!(result.is_some());
        assert_eq!(result.unwrap(), temp_dir.path());
    }

    #[tokio::test]
    async fn test_handle_legacy_ccpm_migration_no_files() -> Result<()> {
        let temp_dir = TempDir::new()?;

        // Test directory with no legacy files
        let result = handle_legacy_ccpm_migration(Some(temp_dir.path().to_path_buf()), false).await;

        assert!(result?.is_none());
        Ok(())
    }

    #[cfg(test)]
    mod lockfile_regeneration_tests {
        use super::*;
        use crate::manifest::Manifest;
        use tempfile::TempDir;

        #[test]
        fn test_load_lockfile_with_regeneration_valid_lockfile() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();
            let manifest_path = project_dir.join("agpm.toml");
            let lockfile_path = project_dir.join("agpm.lock");

            // Create a minimal manifest
            let manifest_content = r#"[sources]
example = "https://github.com/example/repo.git"

[agents]
test = { source = "example", path = "test.md", version = "v1.0.0" }
"#;
            std::fs::write(&manifest_path, manifest_content).unwrap();

            // Create a valid lockfile
            let lockfile_content = r#"version = 1

[[sources]]
name = "example"
url = "https://github.com/example/repo.git"
commit = "abc123def456789012345678901234567890abcd"
fetched_at = "2024-01-01T00:00:00Z"

[[agents]]
name = "test"
source = "example"
path = "test.md"
version = "v1.0.0"
resolved_commit = "abc123def456789012345678901234567890abcd"
checksum = "sha256:examplechecksum"
installed_at = ".claude/agents/test.md"
"#;
            std::fs::write(&lockfile_path, lockfile_content).unwrap();

            // Test loading valid lockfile
            let manifest = Manifest::load(&manifest_path).unwrap();
            let ctx = CommandContext::new(manifest, project_dir.to_path_buf()).unwrap();

            let result = ctx.load_lockfile_with_regeneration(true, "test").unwrap();
            assert!(result.is_some());
        }

        #[test]
        fn test_load_lockfile_with_regeneration_invalid_toml() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();
            let manifest_path = project_dir.join("agpm.toml");
            let lockfile_path = project_dir.join("agpm.lock");

            // Create a minimal manifest
            let manifest_content = r#"[sources]
example = "https://github.com/example/repo.git"
"#;
            std::fs::write(&manifest_path, manifest_content).unwrap();

            // Create an invalid TOML lockfile
            std::fs::write(&lockfile_path, "invalid toml [[[").unwrap();

            // Test loading invalid lockfile in non-interactive mode
            let manifest = Manifest::load(&manifest_path).unwrap();
            let ctx = CommandContext::new(manifest, project_dir.to_path_buf()).unwrap();

            // This should return an error in non-interactive mode
            let result = ctx.load_lockfile_with_regeneration(true, "test");
            assert!(result.is_err());

            let error_msg = result.unwrap_err().to_string();
            assert!(error_msg.contains("Invalid or corrupted lockfile detected"));
            assert!(error_msg.contains("beta software"));
            assert!(error_msg.contains("cp agpm.lock"));
        }

        #[test]
        fn test_load_lockfile_with_regeneration_missing_lockfile() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();
            let manifest_path = project_dir.join("agpm.toml");

            // Create a minimal manifest
            let manifest_content = r#"[sources]
example = "https://github.com/example/repo.git"
"#;
            std::fs::write(&manifest_path, manifest_content).unwrap();

            // Test loading non-existent lockfile
            let manifest = Manifest::load(&manifest_path).unwrap();
            let ctx = CommandContext::new(manifest, project_dir.to_path_buf()).unwrap();

            let result = ctx.load_lockfile_with_regeneration(true, "test").unwrap();
            assert!(result.is_none()); // Should return None for missing lockfile
        }

        #[test]
        fn test_load_lockfile_with_regeneration_version_incompatibility() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();
            let manifest_path = project_dir.join("agpm.toml");
            let lockfile_path = project_dir.join("agpm.lock");

            // Create a minimal manifest
            let manifest_content = r#"[sources]
example = "https://github.com/example/repo.git"
"#;
            std::fs::write(&manifest_path, manifest_content).unwrap();

            // Create a lockfile with future version
            let lockfile_content = r#"version = 999

[[sources]]
name = "example"
url = "https://github.com/example/repo.git"
commit = "abc123def456789012345678901234567890abcd"
fetched_at = "2024-01-01T00:00:00Z"
"#;
            std::fs::write(&lockfile_path, lockfile_content).unwrap();

            // Test loading future version lockfile
            let manifest = Manifest::load(&manifest_path).unwrap();
            let ctx = CommandContext::new(manifest, project_dir.to_path_buf()).unwrap();

            let result = ctx.load_lockfile_with_regeneration(true, "test");
            assert!(result.is_err());

            let error_msg = result.unwrap_err().to_string();
            assert!(error_msg.contains("version") || error_msg.contains("newer"));
        }

        #[test]
        fn test_load_lockfile_with_regeneration_cannot_regenerate() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();
            let manifest_path = project_dir.join("agpm.toml");
            let lockfile_path = project_dir.join("agpm.lock");

            // Create a minimal manifest
            let manifest_content = r#"[sources]
example = "https://github.com/example/repo.git"
"#;
            std::fs::write(&manifest_path, manifest_content).unwrap();

            // Create an invalid TOML lockfile
            std::fs::write(&lockfile_path, "invalid toml [[[").unwrap();

            // Test with can_regenerate = false
            let manifest = Manifest::load(&manifest_path).unwrap();
            let ctx = CommandContext::new(manifest, project_dir.to_path_buf()).unwrap();

            let result = ctx.load_lockfile_with_regeneration(false, "test");
            assert!(result.is_err());

            // Should return the original error, not the enhanced one
            let error_msg = result.unwrap_err().to_string();
            assert!(!error_msg.contains("Invalid or corrupted lockfile detected"));
            assert!(
                error_msg.contains("Failed to load lockfile")
                    || error_msg.contains("Invalid TOML syntax")
            );
        }

        #[test]
        fn test_backup_and_regenerate_lockfile() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();
            let manifest_path = project_dir.join("agpm.toml");
            let lockfile_path = project_dir.join("agpm.lock");

            // Create a minimal manifest
            let manifest_content = r#"[sources]
example = "https://github.com/example/repo.git"
"#;
            std::fs::write(&manifest_path, manifest_content).unwrap();

            // Create an invalid lockfile
            std::fs::write(&lockfile_path, "invalid content").unwrap();

            // Test backup and regeneration
            let manifest = Manifest::load(&manifest_path).unwrap();
            let ctx = CommandContext::new(manifest, project_dir.to_path_buf()).unwrap();

            let backup_path = lockfile_path.with_extension("lock.invalid");

            // This should backup the file and remove the original
            ctx.backup_and_regenerate_lockfile(&backup_path, "test").unwrap();

            // Check that backup was created
            assert!(backup_path.exists());
            assert_eq!(std::fs::read_to_string(&backup_path).unwrap(), "invalid content");

            // Check that original was removed
            assert!(!lockfile_path.exists());
        }

        #[test]
        fn test_create_non_interactive_error() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();
            let manifest_path = project_dir.join("agpm.toml");

            // Create a minimal manifest
            let manifest_content = r#"[sources]
example = "https://github.com/example/repo.git"
"#;
            std::fs::write(&manifest_path, manifest_content).unwrap();

            // Test non-interactive error creation
            let manifest = Manifest::load(&manifest_path).unwrap();
            let ctx = CommandContext::new(manifest, project_dir.to_path_buf()).unwrap();

            let error = ctx.create_non_interactive_error("Invalid TOML syntax", "test");
            let error_msg = error.to_string();

            assert!(error_msg.contains("Invalid TOML syntax"));
            assert!(error_msg.contains("beta software"));
            assert!(error_msg.contains("cp agpm.lock"));
            assert!(error_msg.contains("rm agpm.lock"));
            assert!(error_msg.contains("agpm install"));
        }
    }

    /// Tests for CCPM and format migration functions.
    ///
    /// Note: These tests focus on non-interactive mode since mocking stdin
    /// with tokio::io::stdin() is complex. Interactive behavior is implicitly
    /// tested in CI environments which are non-TTY.
    mod migration_tests {
        use super::*;
        use tempfile::TempDir;

        #[tokio::test]
        async fn test_handle_legacy_ccpm_migration_with_files_non_interactive() {
            // Tests run in non-TTY mode, so this tests the non-interactive path
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();

            // Create legacy CCPM files
            std::fs::write(
                project_dir.join("ccpm.toml"),
                "[sources]\ntest = \"https://test.git\"\n",
            )
            .unwrap();
            std::fs::write(project_dir.join("ccpm.lock"), "version = 1\n").unwrap();

            // In non-interactive mode (yes=false), should return None without migrating
            let result = handle_legacy_ccpm_migration(Some(project_dir.to_path_buf()), false).await;
            assert!(result.is_ok());
            assert!(result.unwrap().is_none());

            // Files should NOT be migrated (non-interactive mode)
            assert!(project_dir.join("ccpm.toml").exists());
            assert!(!project_dir.join("agpm.toml").exists());
        }

        #[tokio::test]
        async fn test_handle_legacy_format_migration_no_migration_needed() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();

            // Create project with new format (files in agpm/ subdirectory)
            let agents_dir = project_dir.join(".claude/agents/agpm");
            std::fs::create_dir_all(&agents_dir).unwrap();
            std::fs::write(agents_dir.join("test.md"), "# Test Agent").unwrap();

            // Create a lockfile with new paths
            let lockfile = r#"version = 1

[[agents]]
name = "test"
source = "test"
path = "agents/test.md"
version = "v1.0.0"
resolved_commit = "abc123"
checksum = "sha256:abc"
context_checksum = "sha256:def"
installed_at = ".claude/agents/agpm/test.md"
dependencies = []
resource_type = "Agent"
tool = "claude-code"
"#;
            std::fs::write(project_dir.join("agpm.lock"), lockfile).unwrap();

            // No migration needed
            let result = handle_legacy_format_migration(project_dir, false).await;
            assert!(result.is_ok());
            assert!(!result.unwrap()); // false = no migration performed
        }

        #[tokio::test]
        async fn test_handle_legacy_format_migration_with_old_paths_non_interactive() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();

            // Create resources at OLD paths (not in agpm/ subdirectory)
            let agents_dir = project_dir.join(".claude/agents");
            std::fs::create_dir_all(&agents_dir).unwrap();
            std::fs::write(agents_dir.join("test.md"), "# Test Agent").unwrap();

            // Create a lockfile pointing to old paths
            let lockfile = r#"version = 1

[[agents]]
name = "test"
source = "test"
path = "agents/test.md"
version = "v1.0.0"
resolved_commit = "abc123"
checksum = "sha256:abc"
context_checksum = "sha256:def"
installed_at = ".claude/agents/test.md"
dependencies = []
resource_type = "Agent"
tool = "claude-code"
"#;
            std::fs::write(project_dir.join("agpm.lock"), lockfile).unwrap();

            // In non-interactive mode (yes=false), should return false without migrating
            let result = handle_legacy_format_migration(project_dir, false).await;
            assert!(result.is_ok());
            assert!(!result.unwrap()); // false = no migration performed

            // Files should NOT be migrated (non-interactive mode)
            assert!(agents_dir.join("test.md").exists());
            assert!(!agents_dir.join("agpm/test.md").exists());
        }

        #[tokio::test]
        async fn test_handle_legacy_format_migration_with_gitignore_section_non_interactive() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();

            // Create .gitignore with managed section
            let gitignore = r#"# User entries
node_modules/

# AGPM managed entries - do not edit below this line
.claude/agents/test.md
# End of AGPM managed entries
"#;
            std::fs::write(project_dir.join(".gitignore"), gitignore).unwrap();

            // Create an empty lockfile (gitignore section alone triggers migration)
            std::fs::write(project_dir.join("agpm.lock"), "version = 1\n").unwrap();

            // In non-interactive mode (yes=false), should return false without migrating
            let result = handle_legacy_format_migration(project_dir, false).await;
            assert!(result.is_ok());
            assert!(!result.unwrap()); // false = no migration performed

            // .gitignore should NOT be modified (non-interactive mode)
            let content = std::fs::read_to_string(project_dir.join(".gitignore")).unwrap();
            assert!(content.contains("# AGPM managed entries"));
        }

        #[tokio::test]
        async fn test_handle_legacy_format_migration_no_lockfile() {
            let temp_dir = TempDir::new().unwrap();
            let project_dir = temp_dir.path();

            // Create resources at old paths but NO lockfile
            let agents_dir = project_dir.join(".claude/agents");
            std::fs::create_dir_all(&agents_dir).unwrap();
            std::fs::write(agents_dir.join("test.md"), "# Test Agent").unwrap();

            // Without lockfile, can't detect AGPM-managed files
            // so no migration should be detected
            let result = handle_legacy_format_migration(project_dir, false).await;
            assert!(result.is_ok());
            assert!(!result.unwrap()); // false = no migration needed
        }
    }

    /// Tests for gitignore entry offering functionality.
    mod gitignore_offering_tests {
        use super::*;
        use crate::installer::ConfigValidation;
        use tempfile::TempDir;

        #[tokio::test]
        async fn test_handle_missing_gitignore_no_entries() {
            let temp_dir = TempDir::new().unwrap();
            let validation = ConfigValidation::default(); // Empty missing entries

            let result =
                handle_missing_gitignore_entries(&validation, temp_dir.path(), false).await;

            assert!(result.is_ok());
            assert!(!result.unwrap()); // No entries added
        }

        #[tokio::test]
        async fn test_handle_missing_gitignore_with_yes_flag() {
            let temp_dir = TempDir::new().unwrap();
            let validation = ConfigValidation {
                missing_gitignore_entries: vec![
                    ".claude/agents/agpm/".to_string(),
                    "agpm.private.toml".to_string(),
                ],
                ..Default::default()
            };

            // With --yes flag, should add entries without prompting
            let result = handle_missing_gitignore_entries(
                &validation,
                temp_dir.path(),
                true, // yes=true
            )
            .await;

            assert!(result.is_ok());
            assert!(result.unwrap()); // Entries added

            // Verify .gitignore was created with correct content
            let content = std::fs::read_to_string(temp_dir.path().join(".gitignore")).unwrap();
            assert!(content.contains("# AGPM managed paths"));
            assert!(content.contains(".claude/*/agpm/"));
            assert!(content.contains(".opencode/*/agpm/"));
            assert!(content.contains(".agpm/"));
            assert!(content.contains("agpm.private.toml"));
            assert!(content.contains("agpm.private.lock"));
            assert!(content.contains("# End of AGPM managed paths"));
        }

        #[tokio::test]
        async fn test_handle_missing_gitignore_appends_to_existing() {
            let temp_dir = TempDir::new().unwrap();

            // Create existing .gitignore
            std::fs::write(temp_dir.path().join(".gitignore"), "node_modules/\n.env\n").unwrap();

            let validation = ConfigValidation {
                missing_gitignore_entries: vec![".claude/agents/agpm/".to_string()],
                ..Default::default()
            };

            let result = handle_missing_gitignore_entries(&validation, temp_dir.path(), true).await;

            assert!(result.is_ok());
            assert!(result.unwrap());

            let content = std::fs::read_to_string(temp_dir.path().join(".gitignore")).unwrap();
            // Original content preserved
            assert!(content.contains("node_modules/"));
            assert!(content.contains(".env"));
            // New content added
            assert!(content.contains("# AGPM managed paths"));
            assert!(content.contains(".claude/*/agpm/"));
        }

        #[tokio::test]
        async fn test_handle_missing_gitignore_non_interactive_no_yes() {
            // In test environment, stdin is not a TTY, so this tests non-interactive mode
            let temp_dir = TempDir::new().unwrap();
            let validation = ConfigValidation {
                missing_gitignore_entries: vec![".claude/agents/agpm/".to_string()],
                ..Default::default()
            };

            let result = handle_missing_gitignore_entries(
                &validation,
                temp_dir.path(),
                false, // yes=false, non-TTY
            )
            .await;

            assert!(result.is_ok());
            assert!(!result.unwrap()); // No entries added in non-interactive

            // .gitignore should not be created
            assert!(!temp_dir.path().join(".gitignore").exists());
        }

        #[tokio::test]
        async fn test_handle_missing_gitignore_skips_if_section_exists() {
            let temp_dir = TempDir::new().unwrap();

            // Create .gitignore with existing managed section
            let existing = r#"node_modules/

# AGPM managed paths
.claude/*/agpm/
# End of AGPM managed paths
"#;
            std::fs::write(temp_dir.path().join(".gitignore"), existing).unwrap();

            // Even with missing entries, if section exists, don't add again
            let validation = ConfigValidation {
                missing_gitignore_entries: vec!["agpm.private.toml".to_string()],
                ..Default::default()
            };

            let result = handle_missing_gitignore_entries(&validation, temp_dir.path(), true).await;

            assert!(result.is_ok());
            assert!(!result.unwrap()); // Not added (section exists)

            // Content should be unchanged
            let content = std::fs::read_to_string(temp_dir.path().join(".gitignore")).unwrap();
            assert_eq!(content, existing);
        }

        #[tokio::test]
        async fn test_handle_missing_gitignore_creates_new_file() {
            let temp_dir = TempDir::new().unwrap();

            // No .gitignore exists
            assert!(!temp_dir.path().join(".gitignore").exists());

            let validation = ConfigValidation {
                missing_gitignore_entries: vec![".claude/agents/agpm/".to_string()],
                ..Default::default()
            };

            let result = handle_missing_gitignore_entries(&validation, temp_dir.path(), true).await;

            assert!(result.is_ok());
            assert!(result.unwrap());

            // .gitignore should be created
            assert!(temp_dir.path().join(".gitignore").exists());
            let content = std::fs::read_to_string(temp_dir.path().join(".gitignore")).unwrap();
            assert!(content.contains("# AGPM managed paths"));
        }

        #[tokio::test]
        async fn test_handle_missing_gitignore_handles_file_without_newline() {
            let temp_dir = TempDir::new().unwrap();

            // Create .gitignore without trailing newline
            std::fs::write(temp_dir.path().join(".gitignore"), "node_modules/").unwrap();

            let validation = ConfigValidation {
                missing_gitignore_entries: vec![".claude/agents/agpm/".to_string()],
                ..Default::default()
            };

            let result = handle_missing_gitignore_entries(&validation, temp_dir.path(), true).await;

            assert!(result.is_ok());
            assert!(result.unwrap());

            let content = std::fs::read_to_string(temp_dir.path().join(".gitignore")).unwrap();
            // Should have proper separation (newline added before section)
            assert!(content.contains("node_modules/\n\n# AGPM managed paths"));
        }
    }
}