#!/usr/bin/env bash
# Phase 1 helper: migrate '@material-ui/*' imports to MUI v5 packages.
# Usage: bash $0 --dry   (default)   |   bash $0 --apply
set -euo pipefail

MODE="dry"
[[ "${1-}" == "--apply" ]] && MODE="apply"

ROOT="$(git rev-parse --show-toplevel 2>/dev/null || echo .)"
REPORT_DIR="$ROOT/reports/phase1-$(date +%Y%m%d-%H%M%S)-mui"
mkdir -p "$REPORT_DIR"

# Find candidates: use reports list if present, otherwise grep.
LIST=""
LATEST_REPORT="$(ls -d $ROOT/reports/phase1-* 2>/dev/null | sort | tail -n1 || true)"
if [[ -n "$LATEST_REPORT" && -f "$LATEST_REPORT/mui_v4_imports.txt" ]]; then
  LIST="$(awk -F: '{print $1}' "$LATEST_REPORT/mui_v4_imports.txt" | sort -u)"
else
  LIST="$(grep -RIl --include='*.{ts,tsx,js,jsx}' -e '@material-ui/' "$ROOT/src" || true)"
fi

echo "Files:" > "$REPORT_DIR/changes.log"
echo "$LIST" | sed '/^$/d' | tee -a "$REPORT_DIR/changes.log"

convert_file() {(
  f="$1"
  tmp="$f.__mui_tmp__"
  cp "$f" "$tmp"

  # Core/icon packages
  sed -i 's#@material-ui/core/#@mui/material/#g' "$tmp"
  sed -i 's#@material-ui/core#@mui/material#g' "$tmp"
  sed -i 's#@material-ui/icons/#@mui/icons-material/#g' "$tmp"
  sed -i 's#@material-ui/icons#@mui/icons-material#g' "$tmp"

  # Styles (best-effort): makeStyles/theme from @mui/styles (legacy). Emit a note.
  if grep -q "makeStyles\|withStyles" "$tmp"; then
    echo "NOTE: $f uses makeStyles/withStyles → @mui/styles (legacy) or migrate to sx/Styled API." >> "$REPORT_DIR/notes.txt"
  fi

  if [[ "$MODE" == "apply" ]]; then
    mv "$tmp" "$f"
    echo "[APPLY] $f" >> "$REPORT_DIR/changes.log"
  else
    echo "[DRY]   diff $f"
    git --no-pager diff --no-index "$f" "$tmp" || true
    rm -f "$tmp"
  fi
)}

echo
echo "== Processing =="
echo "$LIST" | while read -r f; do
  [[ -z "$f" ]] && continue
  [[ -f "$f" ]] || continue
  convert_file "$f"
done

echo
echo "Report: $REPORT_DIR"