use crate::bare::GitBare;
use crate::error::{GitError, GitResult};
use crate::pb::*;

impl GitBare {
    /// Find a single commit by revision.
    pub fn find_commit(&self, request: FindCommitRequest) -> GitResult<Commit> {
        let revision = match request.revision.and_then(|s| s.selector) {
            Some(object_selector::Selector::Oid(oid)) => oid.hex,
            Some(object_selector::Selector::Revision(name)) => name.revision,
            None => "HEAD".to_string(),
        };
        crate::sanitize::validate_revision(&revision)?;

        let repo = self.gix_repo()?;
        let oid = repo
            .rev_parse_single(revision.as_str())
            .map_err(|e| GitError::Gix(e.to_string()))?;
        let commit = oid
            .object()
            .map_err(|e| GitError::Gix(e.to_string()))?
            .try_into_commit()
            .map_err(|e| GitError::Gix(format!("not a commit: {e}")))?;

        Ok(crate::commit::get_commit::commit_to_pb(
            self,
            &commit,
            request.include_stats,
        ))
    }

    /// Batch lookup commits by OID list.
    pub fn list_commits_by_oid(
        &self,
        request: ListCommitsByOidRequest,
    ) -> GitResult<ListCommitsByOidResponse> {
        let repo = self.gix_repo()?;
        let mut commits = Vec::new();

        for oid_bytes in &request.oids {
            let hex: String = oid_bytes.iter().map(|b| format!("{b:02x}")).collect();
            if let Ok(oid) = gix::ObjectId::from_hex(hex.as_bytes()) {
                if let Ok(obj) = repo.find_object(oid) {
                    if let Ok(commit) = obj.try_into_commit() {
                        commits.push(crate::commit::get_commit::commit_to_pb(
                            self,
                            &commit,
                            request.include_stats,
                        ));
                    }
                }
            }
            if commits.len() >= 100 {
                break;
            }
        }

        Ok(ListCommitsByOidResponse { commits })
    }
}