#!/usr/bin/env bash
set -euo pipefail
# POS: docker stack — Containers grouped by compose stack (project); standalone group; -a/--all includes stopped
# POS_FLAGS: -a --all
source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"

usage() {
    cat <<EOF
Usage: pos docker stack [-a|--all]

Show running containers grouped by their Docker Compose stack (project).
Non-compose containers (no stack) are listed under a "Standalone" group
at the end.

Flags:
  -a, --all    Include stopped/exited containers too (like docker ps -a)
  -h, --help   Show this help

Exit codes:
  0   Success (also when no containers are found)

Examples:
  pos docker stack          Grouped view of running containers
  pos docker stack -a       Include stopped/exited containers
EOF
    exit 0
}

command -v docker &>/dev/null || err "docker not found — run 'install.sh --apps' and install Docker first"

ALL=0
case "${1:-}" in
    -h|--help) usage ;;
    -a|--all) ALL=1 ;;
esac

ps_args=()
[ "$ALL" -eq 1 ] && ps_args+=(-a)
ps_args+=(--format '{{.Names}}{{"\u001f"}}{{.Label "com.docker.compose.project"}}{{"\u001f"}}{{.Status}}{{"\u001f"}}{{.Ports}}')

if ! data="$(docker ps "${ps_args[@]}" 2>/dev/null)"; then
    err "docker daemon not reachable — is it running?"
fi

if [ -z "$data" ]; then
    echo "No containers."
    exit 0
fi

# Compose projects (stack names), sorted; empty project label = standalone.
projects="$(printf '%s\n' "$data" | awk -F'\x1f' 'NF>=2 && $2!="" {print $2}' | LC_ALL=C sort -u)"
standalone_rows="$(printf '%s\n' "$data" | awk -F'\x1f' 'NF>=2 && $2==""')"

# Column width for aligned output (global so all stacks line up).
width=0
while IFS=$'\x1f' read -r name _proj _status _ports; do
    [ "${#name}" -gt "$width" ] && width="${#name}"
done <<< "$data"

show_rows() {
    local rows="$1"
    [ -z "$rows" ] && return 0
    while IFS=$'\x1f' read -r name _proj status ports; do
        [ -z "$name" ] && continue
        case "$status" in
            Up*)                 sdisp="${GREEN}${status}${RESET}" ;;
            Exited*|Dead*|Created*) sdisp="${RED}${status}${RESET}" ;;
            Paused*|Restarting*) sdisp="${YELLOW}${status}${RESET}" ;;
            *)                   sdisp="$status" ;;
        esac
        printf "  %-*s  %b  %s\n" "$width" "$name" "$sdisp" "${ports:--}"
    done <<< "$rows"
}

stack_header() {
    local label="$1"
    local pad=$((46 - ${#label}))
    [ "$pad" -lt 1 ] && pad=1
    printf -- "── %s%s%s %s\n" "$CYAN" "$label" "$RESET" "$(printf '%*s' "$pad" '' | sed 's/ /─/g')"
}

stacks=0
while IFS= read -r proj; do
    [ -z "$proj" ] && continue
    stacks=$((stacks + 1))
    rows="$(printf '%s\n' "$data" | awk -F'\x1f' -v p="$proj" '$2==p')"
    stack_header "$proj"
    show_rows "$rows"
    echo
done <<< "$projects"

if [ -n "$standalone_rows" ]; then
    stack_header "Standalone"
    show_rows "$standalone_rows"
    echo
fi

containers="$(printf '%s\n' "$data" | grep -c . || true)"
standalone="$(printf '%s\n' "$standalone_rows" | grep -c . || true)"
printf '%*s\n' 60 '' | sed 's/ /─/g'
echo "Stacks: $stacks   containers: $containers   standalone: $standalone"