openmw-config 1.0.0

// SPDX-License-Identifier: MIT OR Apache-2.0
// Copyright (c) 2025 Dave Corley (S3kshun8)

use crate::config::strings;
use std::{fmt, path::PathBuf};

/// A directory path entry from an `openmw.cfg` file (`data=`, `config=`, `user-data=`, etc.).
///
/// Stores both the *original* string exactly as it appeared in the file (for round-trip
/// serialisation) and a *parsed* `PathBuf` with quotes stripped, token substitution applied
/// (`?local?`, `?global?`, `?userdata?`, `?userconfig?`), and the path resolved relative to the
/// config file's directory.
#[derive(Debug, Clone)]
pub struct DirectorySetting {
    pub meta: crate::GameSettingMeta,
    original: String,
    parsed: PathBuf,
}

impl std::fmt::Display for DirectorySetting {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        writeln!(f, "{}", self.original)
    }
}

impl crate::GameSetting for DirectorySetting {
    fn meta(&self) -> &crate::GameSettingMeta {
        &self.meta
    }
}

impl DirectorySetting {
    /// Parses `value` as a directory path relative to `source_config`.
    ///
    /// Consumes the accumulated `comment` string (via [`std::mem::take`]) and stores it in the
    /// setting's metadata so comments are preserved through serialisation.
    pub fn new<S: Into<String>>(value: S, source_config: PathBuf, comment: &mut String) -> Self {
        let original = value.into();
        let parse_base = if source_config.file_name().is_some_and(|f| f == "openmw.cfg") {
            source_config.parent().unwrap_or(source_config.as_path())
        } else {
            source_config.as_path()
        };
        let parsed = strings::parse_data_directory(&parse_base, &original);

        let meta = crate::GameSettingMeta {
            source_config,
            comment: std::mem::take(comment),
        };

        Self {
            meta,
            original,
            parsed,
        }
    }

    /// The raw string exactly as it appeared in the `openmw.cfg` file, including any quotes.
    ///
    /// Use this when serialising back to `openmw.cfg` format to preserve the original style.
    #[must_use]
    pub fn original(&self) -> &String {
        &self.original
    }

    /// Borrowed string view of [`Self::original`].
    #[must_use]
    pub fn original_str(&self) -> &str {
        &self.original
    }

    /// The resolved, normalised path after quote-stripping, token substitution, and
    /// relative-to-config-dir resolution.
    ///
    /// Use this when working with the filesystem.
    #[must_use]
    pub fn parsed(&self) -> &std::path::Path {
        &self.parsed
    }
}

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

    #[test]
    fn test_directory_setting_basic_construction() {
        let config_path = PathBuf::from("/my/config");
        let mut comment = "some comment".to_string();

        let setting = DirectorySetting::new("data", config_path.clone(), &mut comment);

        assert_eq!(setting.original, "data");
        assert_eq!(setting.parsed, config_path.join("data"));
        assert_eq!(setting.meta.source_config, config_path);
        assert_eq!(setting.meta.comment, "some comment");
        assert!(comment.is_empty()); // Should have been cleared
    }

    #[test]
    fn test_directory_setting_with_user_data_token() {
        let config_path = PathBuf::from("/irrelevant");
        let mut comment = String::new();

        let setting = DirectorySetting::new("?userdata?/foo", config_path, &mut comment);

        let expected_prefix = crate::default_userdata_path();
        assert!(setting.parsed.starts_with(expected_prefix));
        assert!(setting.parsed.ends_with("foo/"));
    }

    #[test]
    fn test_directory_setting_with_user_config_token() {
        let config_path = PathBuf::from("/config/dir");
        let mut comment = String::new();

        let setting = DirectorySetting::new("?userconfig?/bar", config_path, &mut comment);
        dbg!(setting.parsed());

        let expected_prefix = crate::default_config_path();
        assert!(setting.parsed.starts_with(expected_prefix));
        assert!(setting.parsed.ends_with("bar"));
    }

    #[test]
    fn test_directory_setting_quoted_path() {
        let config_path = PathBuf::from("/my/config");
        let mut comment = String::new();

        let setting =
            DirectorySetting::new("\"path/with spaces\"", config_path.clone(), &mut comment);

        assert_eq!(setting.original, "\"path/with spaces\"");
        assert_eq!(setting.parsed, config_path.join("path").join("with spaces"));
    }

    #[test]
    fn test_directory_setting_relative_path_normalization() {
        let config_path = PathBuf::from("/my/config");
        let mut comment = String::new();

        let setting = DirectorySetting::new("subdir\\nested", config_path.clone(), &mut comment);

        let expected = config_path.join("subdir").join("nested");
        assert_eq!(setting.parsed, expected);
    }

    fn mock_path(path: &str) -> PathBuf {
        PathBuf::from(path)
    }

    #[test]
    fn test_dot_component_is_removed() {
        let config = mock_path("/etc/openmw");
        let mut comment = String::from("comment");
        let setting = DirectorySetting::new("./data", config.clone(), &mut comment);
        assert_eq!(setting.parsed(), &config.join("data"));
    }

    #[test]
    fn test_double_dot_not_normalized() {
        // OpenMW does not normalize .. — the raw joined path is preserved
        let config = mock_path("/home/user/.config/openmw");
        let mut comment = String::from("comment");
        let setting = DirectorySetting::new("../common", config.clone(), &mut comment);
        let expected = config.join("../common");
        assert_eq!(setting.parsed(), &expected);
    }

    #[test]
    fn test_dot_components_not_normalized() {
        // OpenMW does not normalize . or .. in the middle of a path
        let config = mock_path("/opt/game/config");
        let mut comment = String::new();
        let setting = DirectorySetting::new("foo/./bar/../baz", config.clone(), &mut comment);
        let expected = config.join("foo/./bar/../baz");
        assert_eq!(setting.parsed(), &expected);
    }

    // --- Absolute paths ---

    #[test]
    fn test_absolute_path_not_joined_to_config() {
        // An absolute value must not be prepended with the config dir
        let config = mock_path("/etc/openmw");
        let mut comment = String::new();
        let setting = DirectorySetting::new("/absolute/path/to/data", config, &mut comment);
        assert_eq!(setting.parsed(), &PathBuf::from("/absolute/path/to/data"));
    }

    #[test]
    fn test_absolute_path_original_preserved() {
        let config = mock_path("/etc/openmw");
        let mut comment = String::new();
        let setting = DirectorySetting::new("/absolute/data", config, &mut comment);
        assert_eq!(setting.original(), "/absolute/data");
        assert_eq!(setting.original_str(), "/absolute/data");
    }

    // --- Backslash / separator normalisation ---

    #[test]
    fn test_backslash_normalised_to_separator() {
        // Backslashes in values must be converted to the platform separator
        let config = mock_path("/my/config");
        let mut comment = String::new();
        let setting = DirectorySetting::new("subdir\\nested\\leaf", config.clone(), &mut comment);
        let expected = config.join("subdir").join("nested").join("leaf");
        assert_eq!(setting.parsed(), &expected);
    }

    #[test]
    fn test_mixed_separators_normalised() {
        let config = mock_path("/my/config");
        let mut comment = String::new();
        let setting = DirectorySetting::new("a\\b/c", config.clone(), &mut comment);
        let expected = config.join("a").join("b").join("c");
        assert_eq!(setting.parsed(), &expected);
    }

    // --- Quote handling ---

    #[test]
    fn test_quoted_path_stripped_of_quotes() {
        let config = mock_path("/cfg");
        let mut comment = String::new();
        let setting = DirectorySetting::new("\"simple\"", config.clone(), &mut comment);
        assert_eq!(setting.parsed(), &config.join("simple"));
    }

    #[test]
    fn test_quoted_path_ampersand_escapes_next_char() {
        // & inside quotes escapes the following character (OpenMW quote escape rule)
        let config = mock_path("/cfg");
        let mut comment = String::new();
        // "&"" inside the quoted string should yield a literal "
        let setting = DirectorySetting::new("\"foo&\"bar\"", config.clone(), &mut comment);
        assert_eq!(setting.parsed(), &config.join("foo\"bar"));
    }

    #[test]
    fn test_quoted_path_ampersand_escapes_ampersand() {
        let config = mock_path("/cfg");
        let mut comment = String::new();
        let setting = DirectorySetting::new("\"foo&&bar\"", config.clone(), &mut comment);
        assert_eq!(setting.parsed(), &config.join("foo&bar"));
    }

    #[test]
    fn test_original_preserves_quotes() {
        // original() must round-trip back exactly as it appeared in openmw.cfg
        let config = mock_path("/cfg");
        let mut comment = String::new();
        let setting = DirectorySetting::new("\"path with spaces\"", config, &mut comment);
        assert_eq!(setting.original(), "\"path with spaces\"");
    }

    // --- Token expansion ---

    #[test]
    fn test_userdata_token_only() {
        let config = mock_path("/irrelevant");
        let mut comment = String::new();
        let setting = DirectorySetting::new("?userdata?", config, &mut comment);
        // With no suffix, should resolve exactly to the userdata base dir
        assert_eq!(setting.parsed(), &crate::default_userdata_path());
    }

    #[test]
    fn test_userconfig_token_only() {
        let config = mock_path("/irrelevant");
        let mut comment = String::new();
        let setting = DirectorySetting::new("?userconfig?", config, &mut comment);
        assert_eq!(setting.parsed(), &crate::default_config_path());
    }

    #[test]
    fn test_userdata_token_with_nested_path() {
        let config = mock_path("/irrelevant");
        let mut comment = String::new();
        let setting = DirectorySetting::new("?userdata?/saves/slot1", config, &mut comment);
        let expected = crate::default_userdata_path().join("saves").join("slot1");
        assert_eq!(setting.parsed(), &expected);
    }

    #[test]
    fn test_local_token_only() {
        let config = mock_path("/irrelevant");
        let mut comment = String::new();
        let setting = DirectorySetting::new("?local?", config, &mut comment);
        assert_eq!(setting.parsed(), &crate::default_local_path());
    }

    #[test]
    fn test_local_token_with_nested_path() {
        let config = mock_path("/irrelevant");
        let mut comment = String::new();
        let setting = DirectorySetting::new("?local?/mods/common", config, &mut comment);
        let expected = crate::default_local_path().join("mods").join("common");
        assert_eq!(setting.parsed(), &expected);
    }

    #[test]
    #[cfg(not(windows))]
    fn test_global_token_only_on_supported_platforms() {
        let config = mock_path("/irrelevant");
        let mut comment = String::new();
        let setting = DirectorySetting::new("?global?", config, &mut comment);
        assert_eq!(setting.parsed(), &crate::default_global_path());
    }

    #[test]
    #[cfg(not(windows))]
    fn test_global_token_with_nested_path_on_supported_platforms() {
        let config = mock_path("/irrelevant");
        let mut comment = String::new();
        let setting = DirectorySetting::new("?global?/openmw", config, &mut comment);
        let expected = crate::default_global_path().join("openmw");
        assert_eq!(setting.parsed(), &expected);
    }

    #[test]
    #[cfg(windows)]
    fn test_global_token_is_left_unexpanded_on_windows() {
        let config = mock_path(r"C:\OpenMW");
        let mut comment = String::new();
        let setting = DirectorySetting::new("?global?/data", config.clone(), &mut comment);
        let expected = config.join("?global?").join("data");
        assert_eq!(setting.parsed(), &expected);
    }

    // --- Meta / comment handling ---

    #[test]
    fn test_source_config_stored_verbatim() {
        let config = mock_path("/etc/openmw/openmw.cfg");
        let mut comment = String::new();
        let setting = DirectorySetting::new("data", config.clone(), &mut comment);
        assert_eq!(setting.meta.source_config, config);
    }

    #[test]
    fn test_comment_cleared_after_new() {
        let config = mock_path("/etc/openmw");
        let mut comment = String::from("# a comment\n");
        let setting = DirectorySetting::new("data", config, &mut comment);
        assert_eq!(setting.meta.comment, "# a comment\n");
        assert!(
            comment.is_empty(),
            "comment should be cleared after construction"
        );
    }

    #[test]
    fn test_empty_comment_stays_empty() {
        let config = mock_path("/etc/openmw");
        let mut comment = String::new();
        let setting = DirectorySetting::new("data", config, &mut comment);
        assert!(setting.meta.comment.is_empty());
    }
}