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

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PACKAGE_ROOT="${PACKAGE_ROOT:-$SCRIPT_DIR}"
ENV_FILE="${ENV_FILE:-$PACKAGE_ROOT/.env}"

if [[ -f "$ENV_FILE" ]]; then
  # shellcheck disable=SC1090
  source "$ENV_FILE"
fi

RUN_ROOT="${RUN_ROOT:-$PACKAGE_ROOT}"
BIN_DIR="${BIN_DIR:-$PACKAGE_ROOT/bin}"
LOG_ROOT="${LOG_ROOT:-$RUN_ROOT/logs}"
REPORTS_DIR="${HOURLY_REPORTS_DIR:-$RUN_ROOT/hourly_reports}"
INCIDENT_DIR="${INCIDENT_DIR:-$RUN_ROOT/incident_runs}"
MONITOR_DIR="${MONITOR_DIR:-$PACKAGE_ROOT/monitor}"
SOAK_SCRIPT="${SOAK_SCRIPT:-$PACKAGE_ROOT/run_soak.sh}"
HOURLY_REPORT_SCRIPT="${HOURLY_REPORT_SCRIPT:-$PACKAGE_ROOT/scripts/soak/hourly_soak_report.py}"

SOAK_DURATION_SECS="${SOAK_DURATION_SECS:-0}"
HOURLY_REPORT_INTERVAL_SECS="${HOURLY_REPORT_INTERVAL_SECS:-3600}"
SOAK_RETAIN_RUNS="${SOAK_RETAIN_RUNS:-100}"
CLEAN_TMP_AFTER_RUN="${CLEAN_TMP_AFTER_RUN:-1}"
START_MONITOR_STACK="${START_MONITOR_STACK:-1}"
STOP_MONITOR_STACK_ON_EXIT="${STOP_MONITOR_STACK_ON_EXIT:-0}"
START_METRICS_SERVICE="${START_METRICS_SERVICE:-1}"
STOP_METRICS_SERVICE_ON_EXIT="${STOP_METRICS_SERVICE_ON_EXIT:-0}"
METRICS_LISTEN="${METRICS_LISTEN:-0.0.0.0:9556}"
METRICS_POLL_SECS="${METRICS_POLL_SECS:-5}"
METRICS_INSTANCE="${METRICS_INSTANCE:-remote231-24h}"
PROMETHEUS_RETENTION="${PROMETHEUS_RETENTION:-7d}"
SEND_FEISHU="${SEND_FEISHU:-1}"
FEISHU_DRY_RUN="${FEISHU_DRY_RUN:-0}"
FEISHU_WEBHOOK_SCRIPT="${FEISHU_WEBHOOK_SCRIPT:-}"
FEISHU_WEBHOOK_URL="${FEISHU_WEBHOOK_URL:-}"
export FEISHU_WEBHOOK_URL

WALL_WARN_SECS="${WALL_WARN_SECS:-140}"
VRP_MIN="${VRP_MIN:-900000}"
VAPS_MIN="${VAPS_MIN:-1000}"
PP_MIN="${PP_MIN:-50000}"
WARNING_MAX="${WARNING_MAX:--1}"

SOAK_PID=""
METRICS_PID=""
REPORTER_STOP=0

die() {
  echo "error: $*" >&2
  exit 2
}

is_true() {
  case "${1:-}" in
    1|true|TRUE|yes|YES|on|ON) return 0 ;;
    *) return 1 ;;
  esac
}

validate_non_negative_int() {
  local name="$1"
  local value="$2"
  [[ "$value" =~ ^[0-9]+$ ]] || die "$name must be a non-negative integer: $value"
}

cleanup() {
  REPORTER_STOP=1
  if [[ -n "$SOAK_PID" ]] && kill -0 "$SOAK_PID" >/dev/null 2>&1; then
    kill "$SOAK_PID" >/dev/null 2>&1 || true
    wait "$SOAK_PID" >/dev/null 2>&1 || true
  fi
  if is_true "$STOP_METRICS_SERVICE_ON_EXIT" && [[ -n "$METRICS_PID" ]] && kill -0 "$METRICS_PID" >/dev/null 2>&1; then
    kill "$METRICS_PID" >/dev/null 2>&1 || true
    wait "$METRICS_PID" >/dev/null 2>&1 || true
  fi
  if is_true "$START_MONITOR_STACK" && is_true "$STOP_MONITOR_STACK_ON_EXIT" && [[ -f "$MONITOR_DIR/docker-compose.yml" ]]; then
    (cd "$MONITOR_DIR" && PROMETHEUS_RETENTION="$PROMETHEUS_RETENTION" docker compose down) >/dev/null 2>&1 || true
  fi
}

trap cleanup EXIT INT TERM

run_hourly_report() {
  local window_start="$1"
  local window_end="$2"
  local feishu_args=()
  if is_true "$SEND_FEISHU"; then
    feishu_args+=(--send-feishu)
    if is_true "$FEISHU_DRY_RUN"; then
      feishu_args+=(--dry-run-feishu)
    fi
    if [[ -n "$FEISHU_WEBHOOK_SCRIPT" ]]; then
      feishu_args+=(--feishu-script "$FEISHU_WEBHOOK_SCRIPT")
    fi
  fi
  python3 "$HOURLY_REPORT_SCRIPT" \
    --run-root "$RUN_ROOT" \
    --reports-dir "$REPORTS_DIR" \
    --incident-dir "$INCIDENT_DIR" \
    --window-start "$window_start" \
    --window-end "$window_end" \
    --wall-warn-secs "$WALL_WARN_SECS" \
    --vrp-min "$VRP_MIN" \
    --vaps-min "$VAPS_MIN" \
    --pp-min "$PP_MIN" \
    --warning-max "$WARNING_MAX" \
    "${feishu_args[@]}" \
    >> "$LOG_ROOT/hourly-reporter.stdout" 2>> "$LOG_ROOT/hourly-reporter.stderr" || true
}

format_epoch_rfc3339() {
  date -u -d "@$1" +%Y-%m-%dT%H:%M:%SZ
}

main() {
  validate_non_negative_int "SOAK_DURATION_SECS" "$SOAK_DURATION_SECS"
  validate_non_negative_int "HOURLY_REPORT_INTERVAL_SECS" "$HOURLY_REPORT_INTERVAL_SECS"
  [[ "$HOURLY_REPORT_INTERVAL_SECS" != "0" ]] || die "HOURLY_REPORT_INTERVAL_SECS must be > 0"
  [[ -x "$SOAK_SCRIPT" ]] || die "missing executable: $SOAK_SCRIPT"
  [[ -x "$BIN_DIR/rpki_artifact_metrics" ]] || die "missing executable: $BIN_DIR/rpki_artifact_metrics"
  [[ -f "$HOURLY_REPORT_SCRIPT" ]] || die "missing hourly report script: $HOURLY_REPORT_SCRIPT"

  mkdir -p "$LOG_ROOT" "$REPORTS_DIR" "$INCIDENT_DIR"
  df -h > "$LOG_ROOT/24h-df-before.txt" 2>&1 || true
  free -h > "$LOG_ROOT/24h-free-before.txt" 2>&1 || true

  if is_true "$START_METRICS_SERVICE"; then
    "$BIN_DIR/rpki_artifact_metrics" \
      --run-root "$RUN_ROOT" \
      --listen "$METRICS_LISTEN" \
      --poll-secs "$METRICS_POLL_SECS" \
      --instance "$METRICS_INSTANCE" \
      > "$LOG_ROOT/metrics.stdout" 2> "$LOG_ROOT/metrics.stderr" &
    METRICS_PID="$!"
    echo "$METRICS_PID" > "$LOG_ROOT/metrics.pid"
  fi

  if is_true "$START_MONITOR_STACK"; then
    if [[ ! -f "$MONITOR_DIR/docker-compose.yml" ]]; then
      die "missing monitor compose: $MONITOR_DIR/docker-compose.yml"
    fi
    (cd "$MONITOR_DIR" && PROMETHEUS_RETENTION="$PROMETHEUS_RETENTION" docker compose up -d) \
      > "$LOG_ROOT/monitor-start.stdout" 2> "$LOG_ROOT/monitor-start.stderr"
  fi

  local start_epoch
  local deadline_epoch
  local next_report_epoch
  local window_start_epoch
  local now_epoch
  local window_start
  local window_end
  local run_soak_env
  start_epoch="$(date +%s)"
  if (( SOAK_DURATION_SECS > 0 )); then
    deadline_epoch=$((start_epoch + SOAK_DURATION_SECS))
  else
    deadline_epoch=0
  fi
  next_report_epoch=$((start_epoch + HOURLY_REPORT_INTERVAL_SECS))
  window_start_epoch="$start_epoch"

  run_soak_env="$LOG_ROOT/24h-run-soak.env"
  {
    if [[ -f "$ENV_FILE" ]]; then
      cat "$ENV_FILE"
    fi
    printf '\n# Generated by run_24h_soak_with_metrics.sh\n'
    printf 'MAX_RUNS=-1\n'
    printf 'INTERVAL_SECS=0\n'
    if (( SOAK_DURATION_SECS > 0 )); then
      printf 'STOP_AFTER_SECS=%q\n' "$SOAK_DURATION_SECS"
    else
      printf 'STOP_AFTER_SECS=0\n'
    fi
    printf 'RETAIN_RUNS=%q\n' "$SOAK_RETAIN_RUNS"
    printf 'CLEAN_TMP_AFTER_RUN=%q\n' "$CLEAN_TMP_AFTER_RUN"
  } > "$run_soak_env"

  env \
    ENV_FILE="$run_soak_env" \
    "$SOAK_SCRIPT" \
    > "$LOG_ROOT/24h-soak.stdout" 2> "$LOG_ROOT/24h-soak.stderr" &
  SOAK_PID="$!"
  echo "$SOAK_PID" > "$LOG_ROOT/24h-soak.pid"

  while kill -0 "$SOAK_PID" >/dev/null 2>&1; do
    if (( REPORTER_STOP == 1 )); then
      break
    fi
    now_epoch="$(date +%s)"
    if (( now_epoch >= next_report_epoch )); then
      window_start="$(format_epoch_rfc3339 "$window_start_epoch")"
      window_end="$(format_epoch_rfc3339 "$now_epoch")"
      run_hourly_report "$window_start" "$window_end"
      window_start_epoch="$now_epoch"
      next_report_epoch=$((now_epoch + HOURLY_REPORT_INTERVAL_SECS))
    fi
    if (( deadline_epoch > 0 && now_epoch > deadline_epoch + HOURLY_REPORT_INTERVAL_SECS + 300 )); then
      echo "deadline grace exceeded; waiting for soak process pid=$SOAK_PID" >&2
    fi
    sleep 5
  done

  local soak_exit_code
  set +e
  wait "$SOAK_PID"
  soak_exit_code=$?
  set -e
  SOAK_PID=""

  now_epoch="$(date +%s)"
  if (( now_epoch > window_start_epoch )); then
    window_start="$(format_epoch_rfc3339 "$window_start_epoch")"
    window_end="$(format_epoch_rfc3339 "$now_epoch")"
    run_hourly_report "$window_start" "$window_end"
  fi

  df -h > "$LOG_ROOT/24h-df-after.txt" 2>&1 || true
  free -h > "$LOG_ROOT/24h-free-after.txt" 2>&1 || true
  return "$soak_exit_code"
}

main "$@"