use std::path::Path;

use crate::command::cmd::Cmd;
use crate::command::env::Env;
use crate::command::error::CmdError;
use crate::error::BabyError;
use crate::share;

pub const CALLER: &str = "gitbaby::merge";

pub fn build_merge_base_cmd(dir: &Path, env: Env, one: &str, two: &str) -> Cmd {
    let args: Vec<String> = vec!["merge-base".into(), one.into(), two.into()];
    share::git_cmd(CALLER, dir, env, None, args)
}

pub fn classify_stderr(stderr: &str, one: &str, two: &str) -> BabyError {
    if stderr.trim().is_empty() {
        return BabyError::MergeBaseNotFound(format!("{}..{}", one, two));
    }
    if stderr.contains("fatal: bad revision") {
        return BabyError::RevisionNotFound(format!("{}..{}", one, two));
    }
    BabyError::Custom(format!("git merge-base failed: {}", stderr.trim()))
}

pub fn classify_cmd_error(err: CmdError, one: &str, two: &str) -> BabyError {
    match err {
        CmdError::NonZeroExit { stderr, .. } => classify_stderr(&stderr, one, two),
        CmdError::Spawn { prog, source } => share::classify_spawn_error(prog, source),
        other => BabyError::from(other),
    }
}