// file: kb-app-demo-desktop/src/main_window.rs
// version: 2

//! Main-window helpers and workspace README loading.

pub(crate) fn workspace_root_dir() -> std::path::PathBuf {
    let manifest_dir = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"));
    return match manifest_dir.parent() {
        std::option::Option::Some(parent) => parent.to_path_buf(),
        std::option::Option::None => manifest_dir,
    };
}

pub(crate) fn load_project_readme() -> ks_core::Result<std::string::String> {
    let path = crate::workspace_root_dir().join("README.md");
    let content = match std::fs::read_to_string(&path) {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => {
            return std::result::Result::Err(ks_core::Error::io(format!(
                "cannot read project README '{}': {error}",
                path.display()
            )));
        },
    };
    return std::result::Result::Ok(strip_readme_metadata_comments(content.as_str()));
}

fn strip_readme_metadata_comments(content: &str) -> std::string::String {
    let mut output = std::string::String::new();
    let mut leading_metadata = true;
    for line in content.lines() {
        let trimmed = line.trim();
        if leading_metadata && is_readme_metadata_comment(trimmed) {
            continue;
        }
        leading_metadata = false;
        output.push_str(line);
        output.push('\n');
    }
    return output;
}

fn is_readme_metadata_comment(line: &str) -> bool {
    if line.starts_with("<!-- file:") || line.starts_with("<!--- file:") {
        return true;
    }
    if line.starts_with("<!-- version:") || line.starts_with("<!--- version:") {
        return true;
    }
    return false;
}

#[cfg(test)]
mod tests {
    #[test]
    fn strip_readme_metadata_comments_removes_workspace_header_lines() {
        let content = "<!-- file: README.md -->\n<!-- version: 7 -->\n# Title\nBody\n";
        let cleaned = super::strip_readme_metadata_comments(content);
        assert_eq!(cleaned, "# Title\nBody\n");
    }

    #[test]
    fn strip_readme_metadata_comments_keeps_later_html_comments() {
        let content = "<!-- file: README.md -->\n# Title\n<!-- normal comment -->\nBody\n";
        let cleaned = super::strip_readme_metadata_comments(content);
        assert_eq!(cleaned, "# Title\n<!-- normal comment -->\nBody\n");
    }
}