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

# =============================================================================
# teardown_all.sh — Tear down migration in reverse order
# Runs phase teardown scripts from phase 9 → phase 1 (or a subset).
#
# Usage:
#   ./teardown_all.sh                # Tear down everything (phases 9 → 1)
#   ./teardown_all.sh --through=5    # Tear down phases 9 → 5 (leave 1-4)
#   ./teardown_all.sh --yes          # Skip confirmation prompts
# =============================================================================

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

# ---------------------------------------------------------------------------
# Parse arguments
# ---------------------------------------------------------------------------
THROUGH=1
AUTO_YES=false

for arg in "$@"; do
  case "$arg" in
    --through=*)
      THROUGH="${arg#*=}"
      if ! [[ "$THROUGH" =~ ^[0-9]+$ ]] || [[ "$THROUGH" -lt 1 ]] || [[ "$THROUGH" -gt 9 ]]; then
        log_error "--through must be a number between 1 and 9"
        exit 1
      fi
      ;;
    --yes|-y) AUTO_YES=true ;;
    --help|-h)
      cat <<EOF
Usage: $(basename "$0") [options]

Options:
  --through=N     Only tear down phases N through 9 (default: 1 = everything)
  --yes, -y       Skip all confirmation prompts
  --help          Show this help

Examples:
  $(basename "$0")              Tear down everything
  $(basename "$0") --through=5  Tear down phases 5-9, leave 1-4
  $(basename "$0") --yes        Non-interactive teardown
EOF
      exit 0 ;;
    *) log_error "Unknown argument: $arg"; exit 1 ;;
  esac
done

# ---------------------------------------------------------------------------
# Confirmation (unless --yes)
# ---------------------------------------------------------------------------
if [[ "$AUTO_YES" == "false" ]]; then
  if [[ "$THROUGH" -eq 1 ]]; then
    log_warn "This will tear down ALL phases (9 → 1)."
  else
    log_warn "This will tear down phases 9 → ${THROUGH}."
  fi
  printf 'Are you sure? [y/N] '
  read -r confirm
  if [[ ! "$confirm" =~ ^[Yy]$ ]]; then
    log_info "Teardown cancelled"
    exit 0
  fi
fi

# ---------------------------------------------------------------------------
# Export YES=true so individual teardown scripts skip their own prompts
# when --yes is passed. Each teardown script checks for interactive input,
# but when called from here with --yes, we pipe 'y' to them instead.
# ---------------------------------------------------------------------------

# Teardown scripts in reverse order (9 → 1)
# Each entry: phase_num|script_path
TEARDOWNS=(
  "9|phase9_teardown.sh"
  "8|phase8_teardown.sh"
  "7|phase7_teardown.sh"
  "6|phase6_teardown.sh"
  "5|phase5_teardown.sh"
  "4|phase4_teardown.sh"
  "3|phase3_teardown.sh"
  "2|phase2_teardown.sh"
  "1|phase1_teardown.sh"
)

PASS=0
FAIL=0

for entry in "${TEARDOWNS[@]}"; do
  IFS='|' read -r phase_num script <<< "$entry"

  # Skip phases outside the teardown range
  if [[ "$phase_num" -lt "$THROUGH" ]]; then
    log_info "Skipping Phase ${phase_num} teardown (--through=${THROUGH})"
    continue
  fi

  log_info ">>> Tearing down Phase ${phase_num}..."

  if [[ "$AUTO_YES" == "true" ]]; then
    # Pipe 'y' to all prompts in the teardown script
    if echo "y" | "${SCRIPT_DIR}/${script}"; then
      PASS=$((PASS + 1))
    else
      log_warn "Phase ${phase_num} teardown had issues (continuing)"
      FAIL=$((FAIL + 1))
    fi
  else
    # Run interactively — let user respond to each prompt
    if "${SCRIPT_DIR}/${script}"; then
      PASS=$((PASS + 1))
    else
      log_warn "Phase ${phase_num} teardown had issues (continuing)"
      FAIL=$((FAIL + 1))
    fi
  fi

  printf '\n'
done

# ---------------------------------------------------------------------------
# Summary
# ---------------------------------------------------------------------------
printf '\n'
log_info "Teardown summary: ${PASS} succeeded, ${FAIL} had issues"

if [[ $FAIL -gt 0 ]]; then
  log_warn "Some teardowns had issues — check logs above"
else
  log_success "All teardowns completed successfully"
fi