#!/usr/bin/env bash
# Tests for Mojang version manifest API
# Covers: vanilla server downloads, Java version detection
# Usage: ./tests/test_mojang.sh [mc_version]

source "$(dirname "$0")/test_utils.sh"

MC_VERSION="${1:-$(get_latest_mc_version)}"

if [[ -z "$MC_VERSION" ]]; then
  echo "Could not determine MC version"
  exit 1
fi

echo -e "\n${BOLD}Mojang API Tests (MC ${MC_VERSION})${NC}"
echo ""

# ---------- Mojang manifest ------------------------------------------------

test_manifest_reachable() {
  local body
  body=$(api_get "https://launchermeta.mojang.com/mc/game/version_manifest.json")
  assert_not_empty "$body" "Manifest body should not be empty"
  assert_json_valid "$body" "Manifest should be valid JSON"
}

test_manifest_has_latest() {
  local body
  body=$(api_get "https://launchermeta.mojang.com/mc/game/version_manifest.json")
  assert_json_field "$body" '.latest.release' "Manifest should have .latest.release"
  assert_json_field "$body" '.latest.snapshot' "Manifest should have .latest.snapshot"
}

test_manifest_has_versions_array() {
  local body
  body=$(api_get "https://launchermeta.mojang.com/mc/game/version_manifest.json")
  local count
  count=$(echo "$body" | jq '.versions | length')
  if [[ "$count" -gt 0 ]]; then
    return 0
  else
    echo "ASSERT FAILED: versions array should have entries, got ${count}"
    return 1
  fi
}

test_manifest_version_entry_format() {
  local body
  body=$(api_get "https://launchermeta.mojang.com/mc/game/version_manifest.json")
  # Each version entry should have id, type, url, time, releaseTime
  local first_entry
  first_entry=$(echo "$body" | jq '.versions[0]')
  assert_json_field "$body" '.versions[0].id' "Version entry should have .id"
  assert_json_field "$body" '.versions[0].type' "Version entry should have .type"
  assert_json_field "$body" '.versions[0].url' "Version entry should have .url"
}

test_manifest_contains_mc_version() {
  local body
  body=$(api_get "https://launchermeta.mojang.com/mc/game/version_manifest.json")
  local found
  found=$(echo "$body" | jq -r ".versions[] | select(.id == \"${MC_VERSION}\") | .id")
  assert_equals "$found" "$MC_VERSION" "Manifest should contain MC ${MC_VERSION}"
}

# ---------- Version data (per-version manifest) ----------------------------

get_version_url() {
  local body
  body=$(api_get "https://launchermeta.mojang.com/mc/game/version_manifest.json")
  echo "$body" | jq -r ".versions[] | select(.id == \"${MC_VERSION}\") | .url"
}

test_version_data_reachable() {
  local version_url
  version_url=$(get_version_url)
  assert_not_empty "$version_url" "Version URL should exist for ${MC_VERSION}"

  local body
  body=$(api_get "$version_url")
  assert_not_empty "$body" "Version data body should not be empty"
  assert_json_valid "$body" "Version data should be valid JSON"
}

test_version_data_has_downloads() {
  local version_url
  version_url=$(get_version_url)
  local body
  body=$(api_get "$version_url")
  assert_json_field "$body" '.downloads.server.url' "Version data should have .downloads.server.url"
}

test_version_data_has_java_version() {
  local version_url
  version_url=$(get_version_url)
  local body
  body=$(api_get "$version_url")
  assert_json_field "$body" '.javaVersion.majorVersion' "Version data should have .javaVersion.majorVersion"
}

test_version_data_has_client() {
  local version_url
  version_url=$(get_version_url)
  local body
  body=$(api_get "$version_url")
  assert_json_field "$body" '.downloads.client.url' "Version data should have .downloads.client.url"
}

# ---------- Server jar URL validation --------------------------------------

test_server_jar_url_format() {
  local version_url
  version_url=$(get_version_url)
  local body
  body=$(api_get "$version_url")
  local server_url
  server_url=$(echo "$body" | jq -r '.downloads.server.url')

  assert_matches "$server_url" "^https://(.*minecraft\\.net|piston-data\\.mojang\\.com)/" \
    "Server URL should be a Mojang CDN or piston-data URL"
}

test_server_jar_url_reachable() {
  local version_url
  version_url=$(get_version_url)
  local body
  body=$(api_get "$version_url")
  local server_url
  server_url=$(echo "$body" | jq -r '.downloads.server.url')

  assert_http_ok "$server_url" "Server jar URL should return HTTP 200"
}

# ---------- Java version detection -----------------------------------------

test_java_version_is_numeric() {
  local version_url
  version_url=$(get_version_url)
  local body
  body=$(api_get "$version_url")
  local java_major
  java_major=$(echo "$body" | jq -r '.javaVersion.majorVersion')

  assert_matches "$java_major" "^[0-9]+$" "Java major version should be numeric"
}

test_java_version_known_values() {
  local version_url
  version_url=$(get_version_url)
  local body
  body=$(api_get "$version_url")
  local java_major
  java_major=$(echo "$body" | jq -r '.javaVersion.majorVersion')

  case "$java_major" in
    8|16|17|21) return 0 ;;
    *)
      echo "ASSERT FAILED: Java version ${java_major} is not a known expected value (8,16,17,21)"
      echo "  This may be valid for a new MC release, but verify it."
      return 1
      ;;
  esac
}

# ---------- Specific version spot checks -----------------------------------

test_known_old_version_java_8() {
  # MC 1.16.5 should use Java 8
  local body
  body=$(api_get "https://launchermeta.mojang.com/mc/game/version_manifest.json")
  local version_url
  version_url=$(echo "$body" | jq -r '.versions[] | select(.id == "1.16.5") | .url')

  if [[ -z "$version_url" || "$version_url" == "null" ]]; then
    echo "Could not fetch 1.16.5 version data"
    return 1
  fi

  local vdata
  vdata=$(api_get "$version_url")
  local java_major
  java_major=$(echo "$vdata" | jq -r '.javaVersion.majorVersion')
  assert_equals "$java_major" "8" "MC 1.16.5 should use Java 8"
}

test_known_new_version_java_21() {
  # MC 1.20.5+ should use Java 21
  local body
  body=$(api_get "https://launchermeta.mojang.com/mc/game/version_manifest.json")
  local version_url
  version_url=$(echo "$body" | jq -r '.versions[] | select(.id == "1.21.1") | .url')

  if [[ -z "$version_url" || "$version_url" == "null" ]]; then
    echo "Could not fetch 1.21.1 version data"
    return 1
  fi

  local vdata
  vdata=$(api_get "$version_url")
  local java_major
  java_major=$(echo "$vdata" | jq -r '.javaVersion.majorVersion')
  assert_equals "$java_major" "21" "MC 1.21.1 should use Java 21"
}

test_known_1_18_version_java_17() {
  # MC 1.18.x should use Java 17
  local body
  body=$(api_get "https://launchermeta.mojang.com/mc/game/version_manifest.json")
  local version_url
  version_url=$(echo "$body" | jq -r '.versions[] | select(.id == "1.18.2") | .url')

  if [[ -z "$version_url" || "$version_url" == "null" ]]; then
    echo "Could not fetch 1.18.2 version data"
    return 1
  fi

  local vdata
  vdata=$(api_get "$version_url")
  local java_major
  java_major=$(echo "$vdata" | jq -r '.javaVersion.majorVersion')
  assert_equals "$java_major" "17" "MC 1.18.2 should use Java 17"
}

# ---------- Run all tests --------------------------------------------------

run_test "Mojang manifest is reachable and valid JSON" test_manifest_reachable
run_test "Manifest has .latest.release and .latest.snapshot" test_manifest_has_latest
run_test "Manifest .versions array is non-empty" test_manifest_has_versions_array
run_test "Manifest version entries have required fields" test_manifest_version_entry_format
run_test "Manifest contains MC ${MC_VERSION}" test_manifest_contains_mc_version
run_test "Version data for ${MC_VERSION} is reachable" test_version_data_reachable
run_test "Version data has .downloads.server.url" test_version_data_has_downloads
run_test "Version data has .javaVersion.majorVersion" test_version_data_has_java_version
run_test "Version data has .downloads.client.url" test_version_data_has_client
run_test "Server jar URL matches Mojang CDN pattern" test_server_jar_url_format
run_test "Server jar URL returns HTTP 200" test_server_jar_url_reachable
run_test "Java version is numeric" test_java_version_is_numeric
run_test "Java version is a known value (8/16/17/21)" test_java_version_known_values
run_test "MC 1.16.5 uses Java 8" test_known_old_version_java_8
run_test "MC 1.21.1 uses Java 21" test_known_new_version_java_21
run_test "MC 1.18.2 uses Java 17" test_known_1_18_version_java_17

print_summary