#!/usr/bin/env sh
# gitea.sh — Gitea API 工具（curl + GITEA_TOKEN）。
# 用法:
#   gitea.sh owners                                  # 列出可讀取的 owner（自己 + 組織）
#   gitea.sh repos <owner>                           # 列出 owner 底下可讀取的 repo（全名）
#   gitea.sh default-branch <owner>/<repo>           # 印出預設分支
#   gitea.sh clone-url <owner>/<repo>                # 印出 clone URL
#   gitea.sh wiki-repo <TYPE>                        # 解析頁面類型的 wiki 位置：
#       TYPE = QUESTION|PLAN|ANALYZE|MAINTAIN|REPO|LOG（即頁名前綴）
#       依序取 JSC_WIKI_REPO_{TYPE} > JSC_WIKI_REPO；都未設定 exit 3（呼叫端須詢問使用者）
#   gitea.sh wiki-list <owner>/<repo>                # 列出 wiki 頁名
#   gitea.sh wiki-get <owner>/<repo> <page>          # 印出 wiki 頁 markdown；不存在時 exit 4
#   gitea.sh wiki-put <owner>/<repo> <page> <file>   # 建立或更新 wiki 頁（內容取自檔案）
#   gitea.sh pr-create <owner>/<repo> <head> <base> <title> <body-file>  # 建立 PR，印出 PR URL
#   gitea.sh api <METHOD> <path> [json-file]         # 原始 API 呼叫（path 以 /repos/... 起始）
# 環境變數: GITEA_HOST（例 https://gitea.jsc.idv.tw）、GITEA_TOKEN
set -eu

: "${GITEA_HOST:?GITEA_HOST is required}"
: "${GITEA_TOKEN:?GITEA_TOKEN is required}"
case "$GITEA_HOST" in http://*|https://*) HOST="$GITEA_HOST" ;; *) HOST="https://$GITEA_HOST" ;; esac
API="${HOST%/}/api/v1"

req() { # METHOD path [json-file] -> body（HTTP >= 400 時 exit 4）
  method="$1"; path="$2"; body_file="${3:-}"
  if [ -n "$body_file" ]; then
    out=$(curl -sS -w '\n%{http_code}' -X "$method" \
      -H "Authorization: token $GITEA_TOKEN" -H "Content-Type: application/json" \
      --data-binary "@$body_file" "$API$path")
  else
    out=$(curl -sS -w '\n%{http_code}' -X "$method" \
      -H "Authorization: token $GITEA_TOKEN" "$API$path")
  fi
  code=$(printf '%s' "$out" | tail -n1)
  printf '%s\n' "$out" | sed '$d'
  [ "$code" -lt 400 ]
}

json_field() { # stdin JSON -> 每個物件的指定欄位一行（陣列或單一物件皆可）
  python3 -c '
import json,sys
d=json.load(sys.stdin); k=sys.argv[1]
items=d if isinstance(d,list) else [d]
for i in items:
    v=i.get(k,"")
    if v!="" and v is not None: print(v)
' "$1"
}

cmd="${1:?usage: gitea.sh <command> ...}"; shift
case "$cmd" in
  owners)
    { req GET "/user" | json_field login
      req GET "/user/orgs?limit=50" | json_field username; } | sort -u ;;
  repos)
    owner="${1:?owner required}"
    # 分頁抓 owner 的 repo（org 與 user 端點擇一成功）
    page=1
    while :; do
      out=$(req GET "/orgs/$owner/repos?limit=50&page=$page" 2>/dev/null) \
        || out=$(req GET "/users/$owner/repos?limit=50&page=$page")
      names=$(printf '%s' "$out" | json_field full_name)
      [ -n "$names" ] || break
      printf '%s\n' "$names"
      page=$((page+1))
    done ;;
  default-branch)
    or="${1:?owner/repo required}"
    req GET "/repos/$or" | json_field default_branch ;;
  clone-url)
    or="${1:?owner/repo required}"
    req GET "/repos/$or" | json_field clone_url ;;
  wiki-repo)
    type=$(printf '%s' "${1:?TYPE required}" | tr a-z A-Z)
    eval "v=\${JSC_WIKI_REPO_$type:-}"
    [ -n "$v" ] || v="${JSC_WIKI_REPO:-}"
    if [ -n "$v" ]; then printf '%s\n' "$v"; else
      echo "no wiki repo configured for $type (set JSC_WIKI_REPO_$type or JSC_WIKI_REPO)" >&2; exit 3
    fi ;;
  wiki-list)
    or="${1:?owner/repo required}"
    req GET "/repos/$or/wiki/pages?limit=200" | json_field title ;;
  wiki-get)
    or="${1:?owner/repo required}"; page="${2:?page required}"
    if ! out=$(req GET "/repos/$or/wiki/page/$page" 2>/dev/null); then
      echo "wiki page not found: $page" >&2; exit 4
    fi
    printf '%s' "$out" | python3 -c '
import json,sys,base64
d=json.load(sys.stdin)
sys.stdout.write(base64.b64decode(d.get("content_base64","")).decode("utf-8"))
' ;;
  wiki-put)
    or="${1:?owner/repo required}"; page="${2:?page required}"; file="${3:?content file required}"
    tmp=$(mktemp)
    python3 -c '
import json,sys,base64
title,path=sys.argv[1],sys.argv[2]
content=open(path,"rb").read()
print(json.dumps({"title":title,"content_base64":base64.b64encode(content).decode()}))
' "$page" "$file" > "$tmp"
    if req GET "/repos/$or/wiki/page/$page" >/dev/null 2>&1; then
      req PATCH "/repos/$or/wiki/page/$page" "$tmp" >/dev/null
    else
      req POST "/repos/$or/wiki/new" "$tmp" >/dev/null
    fi
    rm -f "$tmp"
    echo "OK $page" ;;
  pr-create)
    or="${1:?owner/repo required}"; head="${2:?head required}"; base="${3:?base required}"
    title="${4:?title required}"; body_file="${5:?body file required}"
    tmp=$(mktemp)
    python3 -c '
import json,sys
print(json.dumps({"head":sys.argv[1],"base":sys.argv[2],"title":sys.argv[3],
                  "body":open(sys.argv[4],encoding="utf-8").read()}))
' "$head" "$base" "$title" "$body_file" > "$tmp"
    req POST "/repos/$or/pulls" "$tmp" | json_field html_url
    rm -f "$tmp" ;;
  api)
    method="${1:?METHOD}"; path="${2:?path}"; body="${3:-}"
    req "$method" "$path" $body ;;
  *)
    echo "unknown command: $cmd" >&2; exit 2 ;;
esac