use bstr::BStr;

use crate::IsActivePlatform;

/// The error returned by [File::names_and_active_state](crate::File::names_and_active_state()).
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum Error {
    #[error(transparent)]
    NormalizePattern(#[from] gix_pathspec::normalize::Error),
    #[error(transparent)]
    ParsePattern(#[from] gix_pathspec::parse::Error),
}

impl IsActivePlatform {
    /// Returns `true` if the submodule named `name` is active or `false` otherwise.
    /// `config` is the configuration that was passed to the originating [modules file](crate::File).
    /// `attributes(relative_path, case, is_dir, outcome)` provides a way to resolve the attributes mentioned
    /// in `submodule.active` pathspecs that are evaluated in the platforms git configuration.
    ///
    /// A submodule's active state is determined in the following order
    ///
    /// * it's `submodule.<name>.active` is set in `config`
    /// * it matches a `submodule.active` pathspec either positively or negatively via `:!<spec>`
    /// * it's active if it has any `url` set in `config`
    pub fn is_active(
        &mut self,
        config: &gix_config::File<'static>,
        name: &BStr,
        attributes: &mut dyn FnMut(
            &BStr,
            gix_pathspec::attributes::glob::pattern::Case,
            bool,
            &mut gix_pathspec::attributes::search::Outcome,
        ) -> bool,
    ) -> Result<bool, gix_config::value::Error> {
        if let Some(val) = config.boolean("submodule", Some(name), "active").transpose()? {
            return Ok(val);
        };
        if let Some(val) = self.search.as_mut().map(|search| {
            search
                .pattern_matching_relative_path(name, Some(true), attributes)
                .map_or(false, |m| !m.is_excluded())
        }) {
            return Ok(val);
        }
        Ok(config.string("submodule", Some(name), "url").is_some())
    }
}
