#!/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 pr-depend <owner>/<repo> <pr-index> <dep-owner>/<dep-repo> <dep-index>
#       把 PR 掛上前置 PR 依賴；依賴未關閉前 Gitea 會阻擋合併
#   gitea.sh repo-set <owner>/<repo> <description> [website]             # 設定 repo 描述與網頁
#   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
#   GITEA_TOKEN 未設定，或請求遇 401/403 時，自動退回 tea CLI 的登入 token
#   （~/.config/tea/config.yml，優先取 default: true 的登入）；兩者皆無才失敗。
set -eu

tea_token() { # 取 tea CLI 設定檔的 token（優先 default: true 的登入，否則第一個）
  cfg="${HOME}/.config/tea/config.yml"
  [ -f "$cfg" ] || return 1
  t=$(awk '
    /^ *- /             { if (def && tok != "") { print tok; found=1; exit } tok=""; def=0 }
    /^ *token: */       { line=$0; sub(/^ *token: */,"",line); gsub(/"/,"",line)
                          tok=line; if (first=="") first=line }
    /^ *default: *true/ { def=1 }
    END { if (!found) { if (def && tok != "") print tok; else print first } }
  ' "$cfg")
  [ -n "$t" ] && printf '%s\n' "$t"
}

: "${GITEA_HOST:?GITEA_HOST is required}"
TEA_TOKEN=$(tea_token 2>/dev/null || true)
if [ -z "${GITEA_TOKEN:-}" ]; then
  if [ -n "$TEA_TOKEN" ]; then GITEA_TOKEN="$TEA_TOKEN"; else
    : "${GITEA_TOKEN:?GITEA_TOKEN is required}"
  fi
fi
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；401/403 以 tea token 重試一次）
  method="$1"; path="$2"; body_file="${3:-}"
  retried=0
  while :; do
    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' "$out" | tail -n1)
    if [ "$retried" -eq 0 ] && { [ "$code" = 401 ] || [ "$code" = 403 ]; } \
      && [ -n "$TEA_TOKEN" ] && [ "$TEA_TOKEN" != "$GITEA_TOKEN" ]; then
      GITEA_TOKEN="$TEA_TOKEN"; retried=1; continue
    fi
    break
  done
  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 "$tmp" ;;
  pr-depend)
    or="${1:?owner/repo required}"; idx="${2:?pr index required}"
    dep_or="${3:?dep owner/repo required}"; dep_idx="${4:?dep index required}"
    tmp=$(mktemp)
    python3 -c '
import json,sys
o,r=sys.argv[1].split("/",1)
print(json.dumps({"owner":o,"repo":r,"index":int(sys.argv[2])}))
' "$dep_or" "$dep_idx" > "$tmp"
    if ! out=$(req POST "/repos/$or/issues/$idx/dependencies" "$tmp"); then
      rm -f "$tmp"; printf '%s\n' "$out" >&2; exit 4
    fi
    rm -f "$tmp"
    echo "OK $or#$idx depends on $dep_or#$dep_idx" ;;
  repo-set)
    or="${1:?owner/repo required}"; desc="${2:?description required}"; site="${3:-}"
    tmp=$(mktemp)
    python3 -c '
import json,sys
b={"description":sys.argv[1]}
if len(sys.argv)>2 and sys.argv[2]: b["website"]=sys.argv[2]
print(json.dumps(b))
' "$desc" "$site" > "$tmp"
    if ! out=$(req PATCH "/repos/$or" "$tmp"); then
      rm -f "$tmp"; printf '%s\n' "$out" >&2; exit 4
    fi
    rm -f "$tmp"
    echo "OK $or" ;;
  api)
    method="${1:?METHOD}"; path="${2:?path}"; body="${3:-}"
    req "$method" "$path" $body ;;
  *)
    echo "unknown command: $cmd" >&2; exit 2 ;;
esac