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

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
REPO_URL="${HUOBAO_WATCH_REPO_URL:-https://github.com/chatfire-AI/huobao-canvas}"
REF_NAME="${HUOBAO_WATCH_REF:-refs/heads/main}"
STATE_DIR="${HUOBAO_WATCH_STATE_DIR:-$ROOT_DIR/.logs/upstream-watch}"
LAST_SHA_FILE="$STATE_DIR/huobao-canvas.last-sha"
LAST_CHECK_FILE="$STATE_DIR/huobao-canvas.last-check"
LATEST_REPORT_FILE="$STATE_DIR/huobao-canvas.latest-update.md"
LOG_FILE="$STATE_DIR/huobao-canvas.watch.log"

mkdir -p "$STATE_DIR"

timestamp() {
  date "+%Y-%m-%d %H:%M:%S %z"
}

log() {
  printf "%s %s\n" "$(timestamp)" "$*" | tee -a "$LOG_FILE"
}

notify() {
  local title="$1"
  local message="$2"

  if [[ "${HUOBAO_WATCH_NOTIFY:-1}" != "1" ]]; then
    return 0
  fi
  if ! command -v osascript >/dev/null 2>&1; then
    return 0
  fi

  /usr/bin/osascript \
    -e 'on run argv' \
    -e 'display notification (item 2 of argv) with title (item 1 of argv)' \
    -e 'end run' \
    "$title" "$message" >/dev/null 2>&1 || true
}

git_no_proxy() {
  git -c http.proxy= -c https.proxy= "$@"
}

remote_line="$(git_no_proxy ls-remote "$REPO_URL" "$REF_NAME" | head -n 1 || true)"
if [[ -z "$remote_line" ]]; then
  log "ERROR failed to query $REPO_URL $REF_NAME"
  notify "huobao-canvas 检查失败" "无法读取 GitHub 上游，请看 $LOG_FILE"
  exit 1
fi

current_sha="$(awk '{print $1}' <<<"$remote_line")"
if [[ -z "$current_sha" ]]; then
  log "ERROR empty sha from $REPO_URL $REF_NAME"
  notify "huobao-canvas 检查失败" "上游返回空提交号，请看 $LOG_FILE"
  exit 1
fi

previous_sha=""
if [[ -f "$LAST_SHA_FILE" ]]; then
  previous_sha="$(tr -d '[:space:]' < "$LAST_SHA_FILE")"
fi

printf "%s %s %s\n" "$(timestamp)" "$REPO_URL" "$current_sha" > "$LAST_CHECK_FILE"

if [[ -z "$previous_sha" ]]; then
  printf "%s\n" "$current_sha" > "$LAST_SHA_FILE"
  log "initialized huobao-canvas upstream watch at $current_sha"
  if [[ "${HUOBAO_WATCH_NOTIFY_ON_INIT:-0}" == "1" ]]; then
    notify "huobao-canvas 已开始关注" "当前 main: ${current_sha:0:7}"
  fi
  exit 0
fi

if [[ "$current_sha" == "$previous_sha" ]]; then
  log "unchanged huobao-canvas main at ${current_sha:0:7}"
  if [[ "${HUOBAO_WATCH_NOTIFY_UNCHANGED:-0}" == "1" ]]; then
    notify "huobao-canvas 无更新" "当前 main 仍是 ${current_sha:0:7}"
  fi
  exit 0
fi

tmp_dir="$(mktemp -d "${TMPDIR:-/tmp}/huobao-canvas-watch.XXXXXX")"
cleanup() {
  rm -rf "$tmp_dir"
}
trap cleanup EXIT

repo_dir="$tmp_dir/repo"
git_no_proxy clone --depth=50 "$REPO_URL" "$repo_dir" >/dev/null 2>&1 || {
  log "ERROR update detected but failed to clone $REPO_URL"
  notify "huobao-canvas 有更新但拉取失败" "${previous_sha:0:7} -> ${current_sha:0:7}，请看 $LOG_FILE"
  exit 1
}

latest_subject="$(git -C "$repo_dir" log -1 --format=%s "$current_sha" 2>/dev/null || echo "unknown commit")"
latest_author="$(git -C "$repo_dir" log -1 --format=%an "$current_sha" 2>/dev/null || echo "unknown author")"
latest_date="$(git -C "$repo_dir" log -1 --date=format-local:"%Y-%m-%d %H:%M:%S %z" --format=%ad "$current_sha" 2>/dev/null || echo "unknown date")"
commit_list="$(git -C "$repo_dir" log --oneline --max-count=20 "$previous_sha..$current_sha" 2>/dev/null || git -C "$repo_dir" log -1 --oneline "$current_sha")"
compare_url="https://github.com/chatfire-AI/huobao-canvas/compare/$previous_sha...$current_sha"

cat > "$LATEST_REPORT_FILE" <<REPORT
# huobao-canvas upstream update

- Checked at: $(timestamp)
- Repository: $REPO_URL
- Ref: $REF_NAME
- Previous: $previous_sha
- Current: $current_sha
- Latest commit: ${current_sha:0:7} $latest_subject
- Author: $latest_author
- Commit date: $latest_date
- Compare: $compare_url

## Commits

\`\`\`
$commit_list
\`\`\`
REPORT

printf "%s\n" "$current_sha" > "$LAST_SHA_FILE"
log "UPDATED huobao-canvas ${previous_sha:0:7} -> ${current_sha:0:7}: $latest_subject"
notify "huobao-canvas 有更新" "${previous_sha:0:7} -> ${current_sha:0:7}: $latest_subject"