#!/bin/bash

set -euo pipefail

usage() {
    cat <<'EOF'
Usage:
  git.sh show
  git.sh editor [code|nvim]
EOF
}

set_editor() {
    local editor_name="${1:-code}"

    case "$editor_name" in
        code)
            git config --global core.editor "code --wait"
            printf 'Set git core.editor to: %s\n' 'code --wait'
            ;;
        nvim)
            git config --global core.editor "nvim"
            printf 'Set git core.editor to: %s\n' 'nvim'
            ;;
        *)
            printf 'Unknown editor: %s\n' "$editor_name" >&2
            usage >&2
            exit 1
            ;;
    esac
}

show_config() {
    local name email editor
    local helpers=()
    local helper

    name="$(git config --global --get user.name || true)"
    email="$(git config --global --get user.email || true)"
    editor="$(git config --global --get core.editor || true)"

    while IFS= read -r helper; do
        [ -n "$helper" ] && helpers+=("$helper")
    done < <(git config --global --get-all credential.helper || true)

    printf 'Global git config\n'
    printf '  user.name         %s\n' "${name:-<unset>}"
    printf '  user.email        %s\n' "${email:-<unset>}"
    printf '  core.editor       %s\n' "${editor:-<unset>}"

    if [ "${#helpers[@]}" -eq 0 ]; then
        printf '  credential.helper %s\n' '<unset>'
    else
        printf '  credential.helper %s\n' "${helpers[0]}"
        if [ "${#helpers[@]}" -gt 1 ]; then
            local index
            for (( index=1; index<${#helpers[@]}; index++ )); do
                printf '                    %s\n' "${helpers[$index]}"
            done
        fi
    fi
}

case "${1:-show}" in
    show)
        show_config
        ;;
    editor)
        set_editor "${2:-code}"
        ;;
    *)
        usage >&2
        exit 1
        ;;
esac