#!/bin/sh

set -e
set -u

RED="$(tput setaf 1)"
GREEN="$(tput setaf 2)"
YELLOW="$(tput setaf 3)"
BLUE="$(tput setaf 4)"
RESET="$(tput sgr0)"

usage() {
    echo "usage: $(basename "$0") [-v] <target> [<target>...]"
    exit 1
}

root_path() {
    if [ -z "${APPLY_ROOT:-}" ]; then
        cd -- "$(dirname "$0")" >/dev/null 2>&1 && pwd
    else
        echo "$APPLY_ROOT"
    fi
}

read_group() {
    local target="$*"

    while read -r item; do
        # Ignore comments
        case "$item" in
            '#'*)
                ;;
            *)
                echo "$item"
                ;;
        esac
    done < "$(root_path)/$target"
}

run_group() {
    local target="$*"

    for item in $(read_group "$target"); do
        # Ignore comments
        case "$item" in
            '#'*)
                ;;
            *)
                run_pretty "$item"
                ;;
        esac
    done
}

run_unit() {
    /bin/sh -l -c "set -e; set -u; set -o pipefail; . ./lib; . '$(root_path)/$*'"
}

log_file() {
    echo -n "$LOG_DIR/"
    echo -n "$(echo "$1" | sed 's/\//_/g')"
    echo ".log"
}

check_target() {
    local target="$*"

    if [ ! -f "$(root_path)/$target" ]; then
        echo "missing $target"
        return 1
    fi

    case "$target" in
        groups/*)
            for item in $(read_group "$target"); do
                check_target "$item"
            done
            ;;
    esac
}

run_pretty() {
    local target="$*"

    case "$target" in
        groups/*)
            printf "${YELLOW}** ${BLUE}%s ${YELLOW}processing...${RESET}\n" "$target"
            run_group "$target"
            printf "${YELLOW}** ${BLUE}%s ${GREEN}OK${RESET}\n" "$target"
            ;;

        units/*)
            run_pretty_unit "$target"
            ;;
        *)
            echo "unsupported command: $target"
            ;;
    esac
}

run_pretty_unit() {
    local rc
    local log_file
    local target="$*"

    printf "${YELLOW}** ${BLUE}%s${RESET}" "$target"
    [ "$VERBOSE" = "1" ] && echo ": ${YELLOW}starting...${RESET}"

    log_file=$(log_file "$@")

    if [ "$VERBOSE" = "1" ]; then
        set +e
        run_unit "$@"
        rc=$?
        set -e
    else
        set +e
        run_unit "$@" >"$log_file" 2>&1
        rc=$?
        set -e
    fi

    if [ "$VERBOSE" = "1" ]; then
        printf "${YELLOW}** ${BLUE}%s${RESET}: " "$target"
    else
        printf " "
    fi

    if [ $rc -eq 0 ]; then
        echo "${GREEN}OK${RESET}"
    else
        echo "${RED}FAILED${RESET}"
        if [ "$VERBOSE" = "1" ]; then
            echo "For details, see output above" 1>&2
        else
            echo "Here are the last lines of output:" 1>&2
            tail -n20 "$log_file" 1>&2
            echo "For details, see $log_file" 1>&2
        fi
        exit $rc
    fi
}

if [ $# -lt 1 ]; then
    usage
fi

if [ "$1" = "-v" ]; then
    VERBOSE="1"
    shift
else
    VERBOSE="0"
fi

if [ $# -lt 1 ]; then
    usage
fi

# pre-flight checks
for target in "$@"; do
    check_target "$target"
done

# fly!
LOG_DIR="$(mktemp -d)"
for target in "$@"; do
    run_pretty "$target"
done