#!/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"
}

valid_fcm_service_account_json() {
  jq -e '
    .type == "service_account" and
    (.project_id | type == "string" and length > 0) and
    (.client_email | type == "string" and length > 0) and
    (.private_key | type == "string" and length > 0)
  ' >/dev/null 2>&1
}

[[ "$(require_value DEPLOYMENT_ENV)" == test ]] || {
  echo "Test validation requires DEPLOYMENT_ENV=test." >&2
  exit 1
}
[[ "$(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
    ;;

  *)
    echo "EMAIL_DELIVERY_PROVIDER must be smtp." >&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

firebase_values=(
  "$(read_value WNH_FIREBASE_APPLICATION_ID 2>/dev/null || true)"
  "$(read_value WNH_FIREBASE_API_KEY 2>/dev/null || true)"
  "$(read_value WNH_FIREBASE_PROJECT_ID 2>/dev/null || true)"
  "$(read_value WNH_FIREBASE_GCM_SENDER_ID 2>/dev/null || true)"
)
firebase_nonempty=0
for candidate in "${firebase_values[@]}"; do
  [[ -z "$candidate" ]] || firebase_nonempty=$((firebase_nonempty + 1))
done
if ((firebase_nonempty != 0 && firebase_nonempty != ${#firebase_values[@]})); then
  echo "All four test WNH_FIREBASE_* Android client values must be configured together." >&2
  exit 1
fi
if ((firebase_nonempty == ${#firebase_values[@]})); then
  firebase_application_id=${firebase_values[0]}
  firebase_project_id=${firebase_values[2]}
  firebase_sender_id=${firebase_values[3]}
  firebase_prefix="1:$firebase_sender_id:android:"
  [[ "$firebase_sender_id" =~ ^[0-9]+$ &&
    "$firebase_application_id" == "$firebase_prefix"* &&
    -n "${firebase_application_id#"$firebase_prefix"}" ]] || {
    echo "Test WNH_FIREBASE_APPLICATION_ID does not belong to WNH_FIREBASE_GCM_SENDER_ID." >&2
    exit 1
  }
fi

vapid_values=(
  "$(read_value WEB_PUSH_VAPID_PUBLIC_KEY 2>/dev/null || true)"
  "$(read_value WEB_PUSH_VAPID_PRIVATE_KEY 2>/dev/null || true)"
  "$(read_value WEB_PUSH_VAPID_SUBJECT 2>/dev/null || true)"
)
vapid_nonempty=0
for candidate in "${vapid_values[@]}"; do
  [[ -z "$candidate" ]] || vapid_nonempty=$((vapid_nonempty + 1))
done
if ((vapid_nonempty != 0 && vapid_nonempty != ${#vapid_values[@]})); then
  echo "All three test WEB_PUSH_VAPID_* values must be configured together." >&2
  exit 1
fi
if ((vapid_nonempty == ${#vapid_values[@]})) &&
  [[ ! "${vapid_values[2]}" =~ ^(mailto:|https://) ]]; then
  echo "WEB_PUSH_VAPID_SUBJECT must start with mailto: or https://." >&2
  exit 1
fi

fcm_project_id=$(read_value FCM_PROJECT_ID 2>/dev/null || true)
fcm_service_account_file=$(read_value FCM_SERVICE_ACCOUNT_FILE 2>/dev/null || true)
fcm_service_account_json_base64=$(
  read_value FCM_SERVICE_ACCOUNT_JSON_BASE64 2>/dev/null || true
)
if [[ -n "$fcm_service_account_file" && -n "$fcm_service_account_json_base64" ]]; then
  echo "Set only one test FCM service-account credential source." >&2
  exit 1
fi
if [[ -n "$fcm_project_id" || -n "$fcm_service_account_file" ||
  -n "$fcm_service_account_json_base64" ]]; then
  [[ -n "$fcm_project_id" &&
    (-n "$fcm_service_account_file" || -n "$fcm_service_account_json_base64") ]] || {
    echo "Test FCM project ID and exactly one credential source are required together." >&2
    exit 1
  }

  fcm_credential_project_id=
  if [[ -n "$fcm_service_account_file" ]]; then
    command -v jq >/dev/null 2>&1 || {
      echo "Required command is unavailable for FCM validation: jq" >&2
      exit 1
    }
    [[ "$fcm_service_account_file" == /* && -r "$fcm_service_account_file" ]] || {
      echo "Test FCM_SERVICE_ACCOUNT_FILE must be an absolute readable file." >&2
      exit 1
    }
    valid_fcm_service_account_json <"$fcm_service_account_file" || {
      echo "Test FCM_SERVICE_ACCOUNT_FILE is not a complete service-account JSON document." >&2
      exit 1
    }
    fcm_credential_project_id=$(jq --raw-output '.project_id' "$fcm_service_account_file")
  else
    for command in base64 jq; do
      command -v "$command" >/dev/null 2>&1 || {
        echo "Required command is unavailable for FCM validation: $command" >&2
        exit 1
      }
    done
    fcm_decoded_json=$(
      printf '%s' "$fcm_service_account_json_base64" |
        base64 --decode 2>/dev/null
    ) || {
      echo "Test FCM_SERVICE_ACCOUNT_JSON_BASE64 is not valid Base64." >&2
      exit 1
    }
    printf '%s' "$fcm_decoded_json" |
      valid_fcm_service_account_json || {
      echo "Test FCM_SERVICE_ACCOUNT_JSON_BASE64 is not a complete service-account JSON document." >&2
      exit 1
    }
    fcm_credential_project_id=$(printf '%s' "$fcm_decoded_json" | jq --raw-output '.project_id')
  fi

  [[ "$fcm_credential_project_id" == "$fcm_project_id" ]] || {
    echo "Test FCM service-account project does not match FCM_PROJECT_ID." >&2
    exit 1
  }
  if ((firebase_nonempty == ${#firebase_values[@]})); then
    [[ "$fcm_project_id" == "$firebase_project_id" ]] || {
      echo "Test FCM_PROJECT_ID does not match WNH_FIREBASE_PROJECT_ID." >&2
      exit 1
    }
  fi
fi

android_package=$(read_value ANDROID_APP_LINKS_PACKAGE_NAME 2>/dev/null || true)
android_fingerprints=$(read_value ANDROID_APP_LINKS_SHA256_CERT_FINGERPRINTS 2>/dev/null || true)
if [[ -n "$android_package" || -n "$android_fingerprints" ]]; then
  [[ -n "$android_package" && -n "$android_fingerprints" ]] || {
    echo "Test Android App Links package and fingerprints must be configured together." >&2
    exit 1
  }
  [[ "$android_package" =~ ^[A-Za-z][A-Za-z0-9_]*(\.[A-Za-z][A-Za-z0-9_]*)+$ ]] || {
    echo "ANDROID_APP_LINKS_PACKAGE_NAME is not a valid Android application ID." >&2
    exit 1
  }
  [[ "$android_package" == org.whoneedhelp.mobile.staging ]] || {
    echo "Test Android App Links must use org.whoneedhelp.mobile.staging." >&2
    exit 1
  }

  IFS=',' read -r -a android_fingerprint_values <<<"$android_fingerprints"
  for fingerprint in "${android_fingerprint_values[@]}"; do
    compact_fingerprint=${fingerprint//:/}
    compact_fingerprint=${compact_fingerprint//[[:space:]]/}
    [[ "$compact_fingerprint" =~ ^[0-9A-Fa-f]{64}$ ]] || {
      echo "ANDROID_APP_LINKS_SHA256_CERT_FINGERPRINTS contains an invalid SHA-256 fingerprint." >&2
      exit 1
    }
  done
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."