#!/usr/bin/env bash
set -euo pipefail

usage() {
  cat <<EOF
Usage: $(basename "$0") [options]

Test Minecraft server loader integrations in isolated Docker containers.

Options:
  -m, --mc-version <ver>    Minecraft version (default: auto-detect latest)
  -l, --loader <name>       Loader to test (default: all)
  -v, --loader-version <v>  Loader version (default: auto-detect latest)
  -t, --timeout <sec>       Max wait for server jar (default: 180)
  -h, --help                Show this help

Examples:
  $(basename "$0")                              Test all loaders (latest MC)
  $(basename "$0") -m 1.21.1                    Test all loaders on MC 1.21.1
  $(basename "$0") -m 1.21.1 -l fabric          Test Fabric on MC 1.21.1
  $(basename "$0") -m 1.21.1 -l fabric -v 0.19.3  Test Fabric 0.19.3 on MC 1.21.1

Loaders: vanilla paper fabric forge neoforge bedrock
EOF
  exit 0
}

detect_mc_version() {
  curl -sf --connect-timeout 10 --max-time 30 \
    "https://launchermeta.mojang.com/mc/game/version_manifest.json" |
    jq -r '.latest.release'
}

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"

IMAGE="dockercraft-test:latest"
MC_VERSION=""
LOADER=""
LOADER_VERSION=""
TIMEOUT=180
PASS=0
FAIL=0

while [[ $# -gt 0 ]]; do
  case "$1" in
    -h|--help) usage ;;
    -m|--mc-version) MC_VERSION="$2"; shift 2 ;;
    -l|--loader) LOADER="$2"; shift 2 ;;
    -v|--loader-version) LOADER_VERSION="$2"; shift 2 ;;
    -t|--timeout) TIMEOUT="$2"; shift 2 ;;
    *) echo "Unknown option: $1"; usage ;;
  esac
done

if [[ -z "$MC_VERSION" ]]; then
  echo "Detecting latest Minecraft version..."
  MC_VERSION=$(detect_mc_version)
  echo "  -> ${MC_VERSION}"
fi

if [[ -z "$LOADER" ]]; then
  tests=("vanilla" "paper" "fabric" "forge" "neoforge" "bedrock")
else
  tests=("$LOADER")
fi

cleanup() {
  local name="$1"
  docker kill "dc-test-${name}" 2>/dev/null || true
  docker rm "dc-test-${name}" 2>/dev/null || true
  docker volume rm "dc-test-vol-${name}" 2>/dev/null || true
}

run_test() {
  local name="$1"
  shift

  echo "=== Testing: ${name} ==="
  cleanup "$name"

  # Use a named volume instead of a bind mount (avoids host filesystem quirks)
  docker volume create "dc-test-vol-${name}" >/dev/null

  local CONTAINER_ID
  if CONTAINER_ID=$(docker run -d --name "dc-test-${name}" \
    -e EULA=true \
    -e MC_VERSION="${MC_VERSION}" \
    "$@" \
    -v "dc-test-vol-${name}:/data" \
    "${IMAGE}" 2>&1); then

    local waited=0
    local jar_found=false
    while [[ $waited -lt $TIMEOUT ]]; do
      # Check inside the container for the server binary
      if docker exec "dc-test-${name}" test -f /data/server/server.jar 2>/dev/null || \
         docker exec "dc-test-${name}" find /data/server -name 'forge-*-server.jar' 2>/dev/null | grep -q . || \
         docker exec "dc-test-${name}" test -f /data/server/bedrock_server 2>/dev/null; then
        jar_found=true
        break
      fi
      sleep 3
      waited=$((waited + 3))
      echo -n "."
    done
    echo ""

    if $jar_found; then
      if docker exec "dc-test-${name}" test -f /data/server/bedrock_server 2>/dev/null; then
        echo "  PASS (bedrock_server found in ~${waited}s)"
      else
        echo "  PASS (server jar found in ~${waited}s)"
      fi
      PASS=$((PASS + 1))
    else
      echo ""
      echo "  FAIL: server binary not found after ${TIMEOUT}s"
      echo "  --- container logs ---"
      docker logs "dc-test-${name}" 2>&1 | tail -50 || true
      echo "  ---------------------"
      FAIL=$((FAIL + 1))
    fi
  else
    echo ""
    echo "  FAIL: container failed to start"
    echo "  ${CONTAINER_ID}"
    FAIL=$((FAIL + 1))
  fi

  cleanup "$name"
}

echo "Building image..."
DOCKER_BUILDKIT=0 docker build -t "${IMAGE}" "${PROJECT_ROOT}"

for t in "${tests[@]}"; do
  case $t in
    vanilla)
      run_test "vanilla" -e MC_LOADER=vanilla
      ;;
    paper)
      run_test "paper" -e MC_LOADER=paper
      ;;
    fabric)
      run_test "fabric" \
        -e MC_LOADER=fabric \
        -e FABRIC_LOADER_VERSION="${LOADER_VERSION}"
      ;;
    forge)
      run_test "forge" \
        -e MC_LOADER=forge \
        -e FORGE_VERSION="${LOADER_VERSION}"
      ;;
    neoforge)
      run_test "neoforge" \
        -e MC_LOADER=neoforge \
        -e NEOFORGE_VERSION="${LOADER_VERSION}"
      ;;
    bedrock)
      run_test "bedrock" \
        -e MC_LOADER=bedrock \
        -e MC_VERSION=
      ;;
    *)
      echo "Unknown loader: ${t}"
      echo "Valid: vanilla paper fabric forge neoforge bedrock"
      exit 1
      ;;
  esac
done

echo ""
echo "Results: ${PASS} passed, ${FAIL} failed"
[[ $FAIL -eq 0 ]]