#!/usr/bin/env bash

set -eu


log() {
    echo ">> [local]" $@
}

cleanup() {
    set +e
    log "Killing ssh agent."
    ssh-agent -k
    log "Removing workspace archive."
    rm -f /tmp/workspace.tar.bz2
}

trap cleanup EXIT

compress_workdir() {
    log "Packing workspace into archive to transfer to remove machine."
    tar jcvf /tmp/workspace.tar.bz2 --exclude .git --exclude vendor .
}

start_ssh_agent() {
    log "Launching SSH agent"
    eval $(ssh-agent -s)
    ssh-add <(echo "$SSH_PRIVATE_KEY")
}

compose_up() {
    echo "set -e ; log() { echo '>> [remote]' \$@ ; } ; cleanup() { log 'Removing workspace...'; rm -rf \"\$HOME/workspace\" ; } ; log 'Creating workspace directory...' ; mkdir -p \"\$HOME/workspace\" ; trap cleanup EXIT ; log 'Unpacking workspace...' ; tar -C \"\$HOME/workspace\" -xjv ; log 'Launching docker compose...' ; cd \"\$HOME/workspace\" ; docker compose -f \"$DOCKER_COMPOSE_FILENAME\" -p \"$DOCKER_COMPOSE_PROJECT\" pull ; docker compose -f \"$DOCKER_COMPOSE_FILENAME\" -p \"$DOCKER_COMPOSE_PROJECT\" up -d --remove-orphans --build"
}

compose_down() {
    echo "set -e ; log() { echo '>> [remote]' \$@ ; } ; cleanup() { log 'Removing workspace...'; rm -rf \"\$HOME/workspace\" ; } ; log 'Creating workspace directory...' ; mkdir -p \"\$HOME/workspace\" ; trap cleanup EXIT ; log 'Unpacking workspace...' ; tar -C \"\$HOME/workspace\" -xjv ; log 'Launching docker compose...' ; cd \"\$HOME/workspace\" ; docker compose -f \"$DOCKER_COMPOSE_FILENAME\" -p \"$DOCKER_COMPOSE_PROJECT\" down"
}

stack_up() {
    echo "set -e ; log() { echo '>> [remote]' \$@ ; } ; cleanup() { log 'Removing workspace...'; rm -rf \"\$HOME/workspace\" ; } ; log 'Creating workspace directory...' ; mkdir -p \"\$HOME/workspace/$DOCKER_COMPOSE_PROJECT\" ; trap cleanup EXIT ; log 'Unpacking workspace...' ; tar -C \"\$HOME/workspace/$DOCKER_COMPOSE_PROJECT\" -xjv ; log 'Launching docker stack deploy...' ; cd \"\$HOME/workspace/$DOCKER_COMPOSE_PROJECT\" ; docker stack deploy -c \"$DOCKER_COMPOSE_FILENAME\" --prune \"$DOCKER_COMPOSE_PROJECT\""
}

stack_down() {
    # It is not at all necessary to transfer and unpack the workspace here, but I'll do it anyway for simplicity's sake.
    echo "set -e ; log() { echo '>> [remote]' \$@ ; } ; cleanup() { log 'Removing workspace...'; rm -rf \"\$HOME/workspace\" ; } ; log 'Creating workspace directory...' ; mkdir -p \"\$HOME/workspace/$DOCKER_COMPOSE_PROJECT\" ; trap cleanup EXIT ; log 'Unpacking workspace...' ; tar -C \"\$HOME/workspace/$DOCKER_COMPOSE_PROJECT\" -xjv ; log 'Launching docker stack rm...' ; cd \"\$HOME/workspace/$DOCKER_COMPOSE_PROJECT\" ; docker stack rm \"$DOCKER_COMPOSE_PROJECT\""
}

deploy() {
    local remote_command
    if $SWARM_MODE; then
        if [ "$DEPLOY_ACTION" == "up" ]; then
            log "Deploying docker swarm stack ${DOCKER_COMPOSE_PROJECT}."
            remote_command=$(stack_up)
        else
            log "Removing docker swarm stack ${DOCKER_COMPOSE_PROJECT}"
            remote_command=$(stack_down)
        fi
    else
        if [ "$DEPLOY_ACTION" == "up" ]; then
            log "Deploying docker compose project ${DOCKER_COMPOSE_PROJECT}."
            remote_command=$(compose_up)
        else
            log "Removing docker compose project ${DOCKER_COMPOSE_PROJECT}."
            remote_command=$(compose_down)
        fi
    fi
    ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
        "$SSH_USER@$SSH_HOST" -p "$SSH_PORT" \
        "$remote_command" \
        < /tmp/workspace.tar.bz2

}

if [ -n "${RUN_DIR:-}" ]; then
    cd ${RUN_DIR}
    log "Running action from ${RUN_DIR}"
fi

log "Starting deployment main function."
compress_workdir
start_ssh_agent
deploy