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

# =============================================================================
# phase3_teardown.sh — Tear down all runners defined in runners.conf
# For each runner: calls manage_runner.sh remove to stop and clean up.
# Clears GITEA_RUNNER_REGISTRATION_TOKEN from .env since it becomes useless
# after all runners are removed.
# Safe to run against already-torn-down runners (no errors).
# =============================================================================

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
source "${SCRIPT_DIR}/lib/common.sh"

# Parse arguments
AUTO_YES=false
for arg in "$@"; do
  case "$arg" in
    --yes|-y) AUTO_YES=true ;;
    --help|-h)
      cat <<EOF
Usage: $(basename "$0") [options]

Options:
  --yes, -y    Skip all confirmation prompts
  --help, -h   Show this help
EOF
      exit 0
      ;;
    *)
      log_error "Unknown argument: $arg"
      exit 1
      ;;
  esac
done

confirm_action() {
  local prompt="$1"
  if [[ "$AUTO_YES" == "true" ]]; then
    log_info "Auto-confirmed (--yes): ${prompt}"
    return 0
  fi
  printf '%s' "$prompt"
  read -r confirm
  [[ "$confirm" =~ ^[Yy]$ ]]
}

load_env

log_warn "=== Phase 3 Teardown: Runners ==="

RUNNERS_CONF="${SCRIPT_DIR}/runners.conf"

if [[ ! -f "$RUNNERS_CONF" ]]; then
  log_info "runners.conf not found — nothing to tear down"
  exit 0
fi

# Track whether teardown encountered operational errors (not user skips).
TEARDOWN_FAILED=false
REMOVED=0
FAILED=0

# ---------------------------------------------------------------------------
# Step 1: Remove each runner via manage_runner.sh
# manage_runner.sh handles its own safety (skips already-removed runners).
# ---------------------------------------------------------------------------
if confirm_action 'This will stop and remove all runners. Continue? [y/N] '; then
  while IFS= read -r name; do
    [[ -z "$name" ]] && continue
    log_info "Removing runner: ${name}"
    if "${SCRIPT_DIR}/manage_runner.sh" remove --name "$name"; then
      REMOVED=$((REMOVED + 1))
    else
      log_error "Failed to remove runner: ${name}"
      FAILED=$((FAILED + 1))
      TEARDOWN_FAILED=true
    fi
  done < <(ini_list_sections "$RUNNERS_CONF")

  TOTAL=$((REMOVED + FAILED))
  log_info "Results: ${REMOVED} removed, ${FAILED} failed (out of ${TOTAL})"
else
  log_info "Skipped runner removal"
fi

# ---------------------------------------------------------------------------
# Step 2: Clear the registration token from .env
# Only clear if no runners failed — a partial teardown should preserve the
# token so the user can retry without needing to regenerate it.
# ---------------------------------------------------------------------------
if $TEARDOWN_FAILED; then
  log_info "Keeping GITEA_RUNNER_REGISTRATION_TOKEN in .env because some runners failed to remove"
elif [[ -n "${GITEA_RUNNER_REGISTRATION_TOKEN:-}" ]]; then
  save_env_var "GITEA_RUNNER_REGISTRATION_TOKEN" ""
  log_success "GITEA_RUNNER_REGISTRATION_TOKEN cleared from .env"
fi

if $TEARDOWN_FAILED; then
  log_error "Phase 3 teardown completed with errors"
  exit 1
fi

log_success "Phase 3 teardown complete"