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

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
# shellcheck source=scripts/github/_gh_env.sh
source "$SCRIPT_DIR/_gh_env.sh"
# shellcheck source=scripts/github/_gh_target.sh
source "$SCRIPT_DIR/_gh_target.sh"

TARGET_REPO=""
ISSUE_NUMBER=""
BODY_TEXT=""
BODY_FILE=""
DRY_RUN=0
SKIP_PREFLIGHT=0

usage() {
  cat <<'EOF'
Usage:
  bash scripts/github/issue-comment.sh [options]

Options:
  --repo OWNER/REPO   Target repository, default from git remote
  --issue NUMBER      Issue number
  --body TEXT         Comment body text
  --body-file FILE    Comment body file
  --dry-run           Print request payload without sending
  --skip-preflight    Skip GitHub preflight checks
  -h, --help          Show help
EOF
}

fail() {
  echo "[错误] $1" >&2
  exit 1
}

parse_args() {
  while [[ $# -gt 0 ]]; do
    case "$1" in
      --repo)
        TARGET_REPO="${2:?missing value for --repo}"
        shift 2
        ;;
      --issue)
        ISSUE_NUMBER="${2:?missing value for --issue}"
        shift 2
        ;;
      --body)
        BODY_TEXT="${2:?missing value for --body}"
        shift 2
        ;;
      --body-file)
        BODY_FILE="${2:?missing value for --body-file}"
        shift 2
        ;;
      --dry-run)
        DRY_RUN=1
        shift
        ;;
      --skip-preflight)
        SKIP_PREFLIGHT=1
        shift
        ;;
      -h|--help)
        usage
        exit 0
        ;;
      *)
        fail "未知参数: $1"
        ;;
    esac
  done

  if [[ -z "$TARGET_REPO" ]]; then
    TARGET_REPO="$(gh_target_resolve_repo_from_remote)"
  fi

  if [[ -z "$ISSUE_NUMBER" ]]; then
    fail "必须提供 --issue"
  fi

  if [[ -n "$BODY_TEXT" && -n "$BODY_FILE" ]]; then
    fail "--body 与 --body-file 只能使用一个"
  fi

  if [[ -z "$BODY_TEXT" && -z "$BODY_FILE" ]]; then
    fail "必须提供 --body 或 --body-file"
  fi
}

comment_body() {
  if [[ -n "$BODY_FILE" ]]; then
    cat "$BODY_FILE"
    return 0
  fi

  printf '%s' "$BODY_TEXT"
}

main() {
  local body=""
  local payload=""
  local response=""
  parse_args "$@"

  gh_env_prepare
  gh_env_require_token

  if [[ "$SKIP_PREFLIGHT" != "1" ]]; then
    bash "$SCRIPT_DIR/preflight.sh" --repo "$TARGET_REPO" >/dev/null
  fi

  body="$(comment_body)"
  payload="$(jq -nc --arg body "$body" '{body: $body}')"

  if [[ "$DRY_RUN" == "1" ]]; then
    echo "[dry-run] POST repos/${TARGET_REPO}/issues/${ISSUE_NUMBER}/comments"
    printf '%s\n' "$payload" | jq .
    exit 0
  fi

  response="$(
    bash "$SCRIPT_DIR/github_api.sh" \
      --method POST \
      "repos/${TARGET_REPO}/issues/${ISSUE_NUMBER}/comments" \
      --data "$payload"
  )"

  echo "[完成] 已创建 issue 评论: $(printf '%s' "$response" | jq -r '.html_url // .url')"
}

main "$@"