#!/bin/bash

# 매개변수 확인
if [ $# -lt 3 ]; then
  echo "Usage: $0 [-u] <token> <new_message> <channel>"
  exit 1
fi

# 옵션 파싱
silent_mode=false
if [ "$1" == "-u" ]; then
  silent_mode=true
  shift
fi

# 매개변수 읽기
token="$1"                      # Slack App 토큰 (xoxb- 또는 xoxp-로 시작)
new_message="$2"                # 새 메시지
channel="$3"                    # 채널 ID 또는 채널 이름
timestamp_file=".slack_last_ts" # 로컬 timestamp 저장 파일

# Slack 메시지 업데이트 함수 (attachments 대체)
update_message_with_attachments() {
  local ts="$1"
  local msg="$2"

  # 새로운 attachment 생성
  new_attachments="[
    {
      \"color\": \"#3bb143\",
      \"text\": \"$msg\"
    }
  ]"

  # 메시지 업데이트 요청
  curl -s -X POST -H "Authorization: Bearer $token" -H 'Content-type: application/json' \
    --data "{
      \"channel\": \"$channel\",
      \"ts\": \"$ts\",
      \"attachments\": $new_attachments
    }" \
    https://slack.com/api/chat.update | jq .
}

# 댓글로 메시지 추가 함수
add_comment() {
  local ts="$1"
  local msg="$2"

  # 댓글 추가 요청
  response=$(curl -s -X POST -H "Authorization: Bearer $token" -H 'Content-type: application/json' \
    --data "{
      \"channel\": \"$channel\",
      \"text\": \"$msg\",
      \"thread_ts\": \"$ts\"
    }" \
    https://slack.com/api/chat.postMessage)

  # 응답 디버깅
  echo "$response" | jq .
}

# 새 메시지 전송 함수
send_message() {
  local msg="$1"
  response=$(curl -s -X POST -H "Authorization: Bearer $token" -H 'Content-type: application/json' \
    --data "{
      \"channel\": \"$channel\",
      \"text\": \"$msg\"
    }" \
    https://slack.com/api/chat.postMessage)

  # 메시지 전송 후 timestamp 추출
  local ts
  ts=$(echo "$response" | jq -r '.ts')
  if [[ "$ts" != "null" ]]; then
    echo "$ts" > "$timestamp_file"
    echo "Message sent with ts: $ts"
  else
    echo "Failed to send message. Response: $response"
  fi
}

if [ -f "$timestamp_file" ]; then
  ts=$(cat "$timestamp_file")
  echo "Found existing timestamp: $ts"

  if [ -z "$ts" ]; then
    echo "Timestamp is empty. Sending new message..."
    send_message "$new_message"
  else
    if $silent_mode; then
      echo "Replacing attachments for ts: $ts"
      update_message_with_attachments "$ts" "$new_message"
    else
      echo "Adding comment to existing message with ts: $ts"
      add_comment "$ts" "$new_message"
    fi
  fi
else
  echo "timestamp file not found. Sending new message..."
  send_message "$new_message"
fi