#!/bin/bash

set -euo pipefail

if [ "$#" -ne 2 ]; then
  echo "Usage: $0 <source_directory> <s3_destination_uri>"
  echo "Example: $0 ./build s3://my-bucket/optional/basepath"
  exit 1
fi

SOURCE_DIR=${1%/}
DEST_S3_URI=$2

BUCKET="${DEST_S3_URI#s3://}"
BUCKET="${BUCKET%%/*}"

BASE="${DEST_S3_URI#s3://$BUCKET}"
BASE="${BASE#/}"
BASE="${BASE%/}"

prefix_for() {
  local p="$1"
  if [ -n "$BASE" ]; then
    printf "%s/%s" "$BASE" "$p"
  else
    printf "%s" "$p"
  fi
}

LOCK_KEY="$(prefix_for deploy.lock)"
NEW_PREFIX="$(prefix_for new)"
CUR_PREFIX="$(prefix_for current)"
OLD_PREFIX="$(prefix_for old)"

if ! command -v yc >/dev/null 2>&1; then
  echo "Error: yc CLI not found"
  exit 1
fi

while true; do
  LOCK_COUNT=$(yc storage s3api list-objects --bucket "$BUCKET" --prefix "$LOCK_KEY" --max-keys 1 --format json --jq '((.Contents? // .contents?) | length)')
  if [ "${LOCK_COUNT:-0}" -eq 0 ]; then
    break
  fi
  sleep 2
done

TMP_LOCK=$(mktemp) || { echo "mktemp failed"; exit 1; }
trap 'yc storage s3 rm "s3://'"$BUCKET"'/'"$LOCK_KEY"'" >/dev/null 2>&1 || true; rm -f "$TMP_LOCK"' EXIT

printf '%s\n' "$$ $(date -u +%Y-%m-%dT%H:%M:%SZ)" > "$TMP_LOCK"
yc storage s3 cp "$TMP_LOCK" "s3://$BUCKET/$LOCK_KEY"

find "$SOURCE_DIR" -type f -print0 | while IFS= read -r -d '' FILE_PATH; do
  RELATIVE_PATH=${FILE_PATH#"$SOURCE_DIR"/}
  DETECTED_MIME=$(file --brief --mime-type "$FILE_PATH")
  EXT="${FILE_PATH##*.}"
  MIME_TYPE="$DETECTED_MIME"

  if [[ "$DETECTED_MIME" == "text/plain" || "$DETECTED_MIME" == "application/octet-stream" ]]; then
    case "$EXT" in
      css)   MIME_TYPE="text/css" ;;
      js)    MIME_TYPE="application/javascript" ;;
      html)  MIME_TYPE="text/html" ;;
      json)  MIME_TYPE="application/json" ;;
      svg)   MIME_TYPE="image/svg+xml" ;;
      png)   MIME_TYPE="image/png" ;;
      jpg|jpeg) MIME_TYPE="image/jpeg" ;;
      gif)   MIME_TYPE="image/gif" ;;
      woff)  MIME_TYPE="font/woff" ;;
      woff2) MIME_TYPE="font/woff2" ;;
      ttf)   MIME_TYPE="font/ttf" ;;
      eot)   MIME_TYPE="application/vnd.ms-fontobject" ;;
      *)     MIME_TYPE="$DETECTED_MIME" ;;
    esac
  fi

  DEST="s3://$BUCKET/$NEW_PREFIX/$RELATIVE_PATH"
  echo "Uploading $FILE_PATH -> $DEST (Content-Type: $MIME_TYPE)"
  yc storage s3 cp "$FILE_PATH" "$DEST" --content-type="$MIME_TYPE"
done

yc storage s3 rm "s3://$BUCKET/$OLD_PREFIX/" --recursive || true
yc storage s3 mv "s3://$BUCKET/$CUR_PREFIX/" "s3://$BUCKET/$OLD_PREFIX/" --recursive || true
yc storage s3 mv "s3://$BUCKET/$NEW_PREFIX/" "s3://$BUCKET/$CUR_PREFIX/" --recursive

echo "Deploy finished. Serve from s3://$BUCKET/$CUR_PREFIX/"