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

ROOT=$(CDPATH='' cd -- "$(dirname -- "$0")/.." && pwd)
env_file=${1:-}
expected_domain=${2:-}

if [[ -z "$env_file" || -z "$expected_domain" || ! -f "$env_file" ]]; then
  echo "Usage: $0 ENV_FILE EXPECTED_DOMAIN" >&2
  exit 1
fi

[[ "$(stat -c '%a' "$env_file")" == 600 ]] || {
  echo "Test environment must have mode 0600: $env_file" >&2
  exit 1
}
[[ "$(stat -c '%u' "$env_file")" == "$(id -u)" ]] || {
  echo "Test environment must be owned by the current operator." >&2
  exit 1
}

read_value() {
  local key=$1
  awk -v key="$key" '
    index($0, key "=") == 1 {
      print substr($0, length(key) + 2)
      found = 1
      exit
    }
    END { if (!found) exit 1 }
  ' "$env_file"
}

require_value() {
  local key=$1 value
  value=$(read_value "$key") || true
  [[ -n "$value" ]] || {
    echo "$key is missing or empty in $env_file." >&2
    exit 1
  }
  printf '%s' "$value"
}

[[ "$(require_value DEPLOYMENT_ENV)" == test ]] || {
  echo "Test validation requires DEPLOYMENT_ENV=test." >&2
  exit 1
}
[[ "$(require_value DEPLOYMENT_TARGET)" == compose ]] || {
  echo "Test validation requires DEPLOYMENT_TARGET=compose." >&2
  exit 1
}
[[ "$(require_value COMPOSE_PROJECT_NAME)" == who_need_help_test ]] || {
  echo "The test checkout must use COMPOSE_PROJECT_NAME=who_need_help_test." >&2
  exit 1
}
[[ "$(require_value APP_IMAGE)" == who-need-help:test-* ]] || {
  echo "The test checkout must use a test-specific APP_IMAGE." >&2
  exit 1
}
[[ "$(require_value SOCKET_PROXY_IMAGE)" == who-need-help:socket-proxy-test-* ]] || {
  echo "The test checkout must use a test-specific socket-proxy image." >&2
  exit 1
}
[[ "$(require_value POSTGIS_IMAGE)" == who-need-help:postgis-test-* ]] || {
  echo "The test checkout must use a test-specific PostGIS image." >&2
  exit 1
}
[[ "$(require_value DATABASE_MODE)" == container ]] || {
  echo "The test checkout must use its project-owned database container." >&2
  exit 1
}
[[ "$(require_value POSTGRES_DB)" == who_need_help_test ]] || {
  echo "The test database must be named who_need_help_test." >&2
  exit 1
}
[[ "$(require_value DATABASE_URL)" == ecto://*"@db/who_need_help_test" ]] || {
  echo "The test DATABASE_URL must target its own Compose database." >&2
  exit 1
}
email_delivery_provider=$(require_value EMAIL_DELIVERY_PROVIDER)
case "$email_delivery_provider" in
  smtp)
    smtp_relay=$(require_value SMTP_RELAY)
    if [[ "$smtp_relay" != mailpit ]]; then
      require_value SMTP_PORT >/dev/null
      smtp_auth=$(require_value SMTP_AUTH)
      smtp_username=$(read_value SMTP_USERNAME 2>/dev/null || true)
      smtp_password=$(read_value SMTP_PASSWORD 2>/dev/null || true)

      [[ "$smtp_auth" != always || (-n "$smtp_username" && -n "$smtp_password") ]] || {
        echo "External test SMTP requires SMTP_USERNAME and SMTP_PASSWORD when SMTP_AUTH=always." >&2
        exit 1
      }
      [[ (-z "$smtp_username" && -z "$smtp_password") ||
        (-n "$smtp_username" && -n "$smtp_password") ]] || {
        echo "SMTP_USERNAME and SMTP_PASSWORD must be configured together." >&2
        exit 1
      }
    fi
    ;;

  unisender_go)
    require_value UNISENDER_GO_API_KEY >/dev/null
    unisender_base_url=$(require_value UNISENDER_GO_BASE_URL)
    [[ "$unisender_base_url" == https://* ]] || {
      echo "UNISENDER_GO_BASE_URL must use HTTPS." >&2
      exit 1
    }
    ;;

  *)
    echo "EMAIL_DELIVERY_PROVIDER must be smtp or unisender_go." >&2
    exit 1
    ;;
esac
require_value EMAIL_FROM_ADDRESS >/dev/null
[[ "$(require_value PHX_HOST)" == "$expected_domain" &&
  "$(require_value WNH_BASE_URL)" == "https://$expected_domain" ]] || {
  echo "The test public origin does not match EXPECTED_DOMAIN." >&2
  exit 1
}
[[ "$(require_value PUBLIC_UPSTREAM_NAME)" == who-need-help-test ]] || {
  echo "The test public upstream alias must be who-need-help-test." >&2
  exit 1
}

google_id=$(read_value GOOGLE_OAUTH_CLIENT_ID 2>/dev/null || true)
google_secret=$(read_value GOOGLE_OAUTH_CLIENT_SECRET 2>/dev/null || true)
if [[ -n "$google_id" || -n "$google_secret" ]]; then
  [[ -n "$google_id" && -n "$google_secret" ]] || {
    echo "Test Google OAuth ID and secret must be configured together." >&2
    exit 1
  }
fi

secrets=(
  "$(require_value POSTGRES_PASSWORD)"
  "$(require_value SECRET_KEY_BASE)"
  "$(require_value HANDOVER_SECRET)"
  "$(require_value RELEASE_COOKIE)"
  "$(require_value METRICS_TOKEN)"
)
for ((left = 0; left < ${#secrets[@]}; left++)); do
  for ((right = left + 1; right < ${#secrets[@]}; right++)); do
    [[ "${secrets[$left]}" != "${secrets[$right]}" ]] || {
      echo "Test secrets must be independent." >&2
      exit 1
    }
  done
done

"$ROOT/scripts/compose.sh" "$env_file" config --quiet
echo "Test environment isolation and Compose structure passed validation."