#!/usr/bin/env sh
# check-wiki-rules — 驗證 wiki repo 解析與 hash-id 規則。
# 涵蓋 TYPES 列的每一種頁面類型，每種三項：專用變數優先、退回共用變數、不得跨類型代用。
# 全部通過印 OK 並 exit 0；任一項不符印出差異並 exit 1。
set -eu

dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
gitea="$dir/gitea.sh"
hash_id="$dir/hash-id"

TYPES='QUESTION PLAN ANALYZE DELIVER MAINTAIN REPO LOG LEARN ERROR CHECK REPORT SKILLSET'

fail() {
  printf '%s\n' "$1" >&2
  exit 1
}

expect_eq() {
  got=$1
  want=$2
  label=$3
  [ "$got" = "$want" ] || fail "$label: want=$want got=$got"
}

check_repo() { # type label want [VAR=值...]
  type=$1
  label=$2
  want=$3
  shift 3
  got=$(env -i PATH="${PATH:-/usr/bin:/bin}" "$@" "$gitea" wiki-repo "$type")
  expect_eq "$got" "$want" "$label"
}

check_no_repo() { # type label [VAR=值...]：期望 exit 3 且不印出任何 {owner}/{repo}
  type=$1
  label=$2
  shift 2
  if got=$(env -i PATH="${PATH:-/usr/bin:/bin}" "$@" "$gitea" wiki-repo "$type" 2>/dev/null); then
    code=0
  else
    code=$?
  fi
  [ "$code" -eq 3 ] || fail "$label: want exit=3 got exit=$code output=$got"
  [ -z "$got" ] || fail "$label: want no output got=$got"
}

check_hash() {
  input=$1
  want=$2
  got=$("$hash_id" "$input")
  expect_eq "$got" "$want" "hash-id $input"
}

# 其餘每一個類型的誘餌值。跨類型代用一旦發生，回傳的就會是 decoy/{別的類型}。
decoys() { # $1=要排除的類型
  for t in $TYPES; do
    [ "$t" = "$1" ] || printf 'JSC_WIKI_REPO_%s=decoy/%s ' "$t" "$t"
  done
}

for ty in $TYPES; do
  # 1. 自己的變數贏過共用變數，也贏過其他類型的誘餌。
  check_repo "$ty" "$ty specific wins" "own/$ty" \
    $(decoys "$ty") "JSC_WIKI_REPO_$ty=own/$ty" JSC_WIKI_REPO='shared/wiki'

  # 2. 自己的變數未設定時，只退回共用變數。
  check_repo "$ty" "$ty falls back to shared only" 'shared/wiki' \
    $(decoys "$ty") JSC_WIKI_REPO='shared/wiki'

  # 3. 自己的變數與共用變數都沒有時，exit 3，不借用別的類型。
  check_no_repo "$ty" "$ty never borrows another type" $(decoys "$ty")
done

# 未知類型 exit 2，與「設定不足」的 exit 3 分開。
if got=$(env -i PATH="${PATH:-/usr/bin:/bin}" JSC_WIKI_REPO='shared/wiki' \
         "$gitea" wiki-repo NOSUCH 2>/dev/null); then
  code=0
else
  code=$?
fi
[ "$code" -eq 2 ] || fail "unknown type: want exit=2 got exit=$code"
[ -z "$got" ] || fail "unknown type: want no output got=$got"

# hash-id：首碼 0-9/A/B/C 改成 H 加前 7 碼；其餘首碼原樣輸出 8 碼大寫。
check_hash 'case-2' 'H5172CB7'
check_hash 'case-11' 'HA9A6662'
check_hash 'case-1' 'HB6EC7FD'
check_hash 'case-12' 'HCCA8D42'
check_hash 'case-3' 'D3E5AA27'
check_hash 'case-7' 'D794C002'

printf '%s\n' 'OK'