#!/bin/sh
# mirror [REPO] to [URL]     - set up hourly push mirror
# mirror [REPO] from [URL]   - set up hourly fetch mirror
# mirror [REPO] delete       - remove any mirror

_usage() {
    echo "Usage:"
    echo "  mirror [REPO] to [URL]     set up hourly push mirror"
    echo "  mirror [REPO] from [URL]   set up hourly fetch mirror"
    echo "  mirror [REPO] delete       remove any mirror"
    exit "${1:-0}"
}

[ -z "$1" ] && _usage
[ -z "$2" ] && _usage

REPO="$1"
CMD="$2"
ARG="$3"
REPO_PATH="$HOME/$REPO.git"

if [ ! -d "$REPO_PATH" ]; then
    echo "Repository $REPO does not exist"
    exit 1
fi

cd "$REPO_PATH" || exit 1

case "$CMD" in
to)
    [ -z "$ARG" ] && _usage 1
    if git remote get-url mirror-from >/dev/null 2>&1; then
        echo "Error: $REPO already has a mirror-from. Remove it first with: mirror $REPO delete"
        exit 1
    fi
    if git remote get-url mirror-to >/dev/null 2>&1; then
        git remote set-url mirror-to "$ARG"
    else
        git remote add mirror-to "$ARG"
    fi
    echo "Configured $REPO to mirror to $ARG"
    echo "Runs hourly. Logs: /var/log/git-mirrors.log"
    ;;
from)
    [ -z "$ARG" ] && _usage 1
    if git remote get-url mirror-to >/dev/null 2>&1; then
        echo "Error: $REPO already has a mirror-to. Remove it first with: mirror $REPO delete"
        exit 1
    fi
    if git remote get-url mirror-from >/dev/null 2>&1; then
        git remote set-url mirror-from "$ARG"
    else
        git remote add mirror-from "$ARG"
    fi
    echo "Configured $REPO to mirror from $ARG"
    echo "Runs hourly. Logs: /var/log/git-mirrors.log"
    ;;
delete)
    removed=0
    if git remote get-url mirror-to >/dev/null 2>&1; then
        git remote remove mirror-to
        echo "Removed mirror-to for $REPO"
        removed=1
    fi
    if git remote get-url mirror-from >/dev/null 2>&1; then
        git remote remove mirror-from
        echo "Removed mirror-from for $REPO"
        removed=1
    fi
    [ "$removed" -eq 0 ] && echo "No mirror configured for $REPO"
    ;;
*)
    _usage 1
    ;;
esac