#!/usr/bin/env bash
# gitea-labels-sync.sh — 把 labels.yaml（唯一真相源）同步到 inkstone org 底下的受治理 repo。
#
# 用法：
#   scripts/gitea-labels-sync.sh                 # 同步 org 內全部 repo（自動列舉）
#   scripts/gitea-labels-sync.sh InkStoneCo Arcrun   # 只同步指定的 repo
#   DRY_RUN=1 scripts/gitea-labels-sync.sh        # 只印計畫，不寫入
#
# 規則（見票 inkstone/ISEP#4）：
#   - 名稱在 labels.yaml 裡但 repo 沒有 → 建立
#   - 名稱兩邊都有但 color/description/exclusive 不同 → 更新（PATCH）
#   - repo 有、labels.yaml（含 archive 段）都沒有的名稱 → 只印告警，絕不刪除
#   - labels.yaml 的 archive 段：已知的舊名，不視為「非規範」，但也不會被建立/更新
#   - 冪等：兩次連跑，第二次一定是 0 created / 0 updated
#
# 依賴：curl, jq, python3(+pyyaml)
# Token 來源：與 InkStoneCo 頂層同一顆 gitea remote 密碼（不落地、不進 commit）

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
LABELS_YAML="${LABELS_YAML:-$REPO_ROOT/labels.yaml}"
API_BASE="https://git.uncle6.me/api/v1"
ORG="inkstone"
DRY_RUN="${DRY_RUN:-0}"

if [[ ! -f "$LABELS_YAML" ]]; then
  echo "找不到真相源：$LABELS_YAML" >&2
  exit 1
fi

# --- token：跟 InkStoneCo 頂層 gitea remote 拿同一把（不落地檔案、不印出來） ---
TOKEN="${GITEA_TOKEN:-}"
if [[ -z "$TOKEN" ]]; then
  INKSTONE_TOP="${INKSTONE_TOP:-$HOME/Documents/tech_projects/InkStoneCo}"
  if [[ -d "$INKSTONE_TOP/.git" ]]; then
    TOKEN="$(git -C "$INKSTONE_TOP" remote get-url gitea 2>/dev/null | sed -E 's|.*//[^:]+:([^@]+)@.*|\1|')"
  fi
fi
if [[ -z "$TOKEN" ]]; then
  echo "拿不到 Gitea token——設 GITEA_TOKEN 環境變數，或確認 $INKSTONE_TOP 的 gitea remote 存在" >&2
  exit 1
fi

# --- labels.yaml → JSON（一次轉換，供後面反覆查詢用） ---
LABELS_JSON="$(python3 -c "
import yaml, json, sys
with open('$LABELS_YAML') as f:
    d = yaml.safe_load(f)
print(json.dumps(d))
")"

REPO_NAMES=("$@")
if [[ ${#REPO_NAMES[@]} -eq 0 ]]; then
  # macOS 內建 bash 是 3.2，沒有 mapfile/readarray，改用相容寫法
  REPO_NAMES=()
  while IFS= read -r line; do
    [[ -n "$line" ]] && REPO_NAMES+=("$line")
  done < <(curl -sf -H "Authorization: token $TOKEN" \
    "$API_BASE/orgs/$ORG/repos?limit=50" | python3 -c "
import json, sys
for r in json.load(sys.stdin):
    print(r['name'])
")
fi

echo "受治理 repo（${#REPO_NAMES[@]} 個）：${REPO_NAMES[*]}"
echo "DRY_RUN=$DRY_RUN"
echo "================================================================"

TOTAL_CREATED=0
TOTAL_UPDATED=0
declare -a SUMMARY_LINES=()

for REPO in "${REPO_NAMES[@]}"; do
  echo ""
  echo "── $ORG/$REPO ──────────────────────────────────────────"

  EXISTING_JSON="$(curl -sf -H "Authorization: token $TOKEN" \
    "$API_BASE/repos/$ORG/$REPO/labels?limit=50")"

  # 用 python3 一次算出這個 repo 的 create/update/warn 計畫（純比對，不動網路）
  # 用暫存檔傳資料給 python（避免把含 emoji／引號的 JSON 內嵌進 -c 字串源碼裡出錯）
  LABELS_TMP="$(mktemp)"
  EXISTING_TMP="$(mktemp)"
  printf '%s' "$LABELS_JSON" > "$LABELS_TMP"
  printf '%s' "$EXISTING_JSON" > "$EXISTING_TMP"
  PLAN_JSON="$(python3 -c "
import json, sys

with open('$LABELS_TMP', encoding='utf-8') as f:
    labels_def = json.load(f)
with open('$EXISTING_TMP', encoding='utf-8') as f:
    existing = json.load(f)

canonical = labels_def.get('labels', [])
archived_names = {a['name'] for a in labels_def.get('archive', [])}
canonical_by_name = {l['name']: l for l in canonical}
existing_by_name = {l['name']: l for l in existing}

to_create = []
to_update = []
for name, want in canonical_by_name.items():
    have = existing_by_name.get(name)
    if have is None:
        to_create.append(want)
        continue
    diff = {}
    if have.get('color', '').lstrip('#').lower() != want['color'].lstrip('#').lower():
        diff['color'] = want['color']
    if (have.get('description') or '') != (want.get('description') or ''):
        diff['description'] = want.get('description', '')
    if bool(have.get('exclusive', False)) != bool(want.get('exclusive', False)):
        diff['exclusive'] = bool(want.get('exclusive', False))
    if diff:
        to_update.append({'id': have['id'], 'name': name, 'diff': diff})

extras = []
for name in existing_by_name:
    if name not in canonical_by_name and name not in archived_names:
        extras.append(name)

print(json.dumps({'create': to_create, 'update': to_update, 'extras': extras}))
")"
  rm -f "$LABELS_TMP" "$EXISTING_TMP"

  N_CREATE="$(echo "$PLAN_JSON" | jq '.create | length')"
  N_UPDATE="$(echo "$PLAN_JSON" | jq '.update | length')"
  N_EXTRA="$(echo "$PLAN_JSON" | jq '.extras | length')"

  if [[ "$N_CREATE" -gt 0 ]]; then
    echo "$PLAN_JSON" | jq -c '.create[]' | while read -r item; do
      NAME="$(echo "$item" | jq -r '.name')"
      echo "  + 建立: $NAME"
      if [[ "$DRY_RUN" != "1" ]]; then
        BODY="$(echo "$item" | jq '{name, color, description: (.description // ""), exclusive: (.exclusive // false)}')"
        curl -sf -X POST -H "Authorization: token $TOKEN" -H "Content-Type: application/json" \
          -d "$BODY" "$API_BASE/repos/$ORG/$REPO/labels" > /dev/null
      fi
    done
  fi

  if [[ "$N_UPDATE" -gt 0 ]]; then
    echo "$PLAN_JSON" | jq -c '.update[]' | while read -r item; do
      NAME="$(echo "$item" | jq -r '.name')"
      ID="$(echo "$item" | jq -r '.id')"
      DIFF="$(echo "$item" | jq -c '.diff')"
      echo "  ~ 更新: $NAME ($DIFF)"
      if [[ "$DRY_RUN" != "1" ]]; then
        curl -sf -X PATCH -H "Authorization: token $TOKEN" -H "Content-Type: application/json" \
          -d "$DIFF" "$API_BASE/repos/$ORG/$REPO/labels/$ID" > /dev/null
      fi
    done
  fi

  if [[ "$N_EXTRA" -gt 0 ]]; then
    echo "  ⚠ 非規範標籤（不動手，只告警）：$(echo "$PLAN_JSON" | jq -r '.extras | join(", ")')"
  fi

  echo "  小計：+$N_CREATE created, ~$N_UPDATE updated, ⚠$N_EXTRA extra"
  SUMMARY_LINES+=("$REPO|$N_CREATE|$N_UPDATE|$N_EXTRA")
  TOTAL_CREATED=$((TOTAL_CREATED + N_CREATE))
  TOTAL_UPDATED=$((TOTAL_UPDATED + N_UPDATE))
done

echo ""
echo "================================================================"
echo "總計：${TOTAL_CREATED} created, ${TOTAL_UPDATED} updated（跨 ${#REPO_NAMES[@]} 個 repo）"
echo ""
printf "%-28s %8s %8s %8s\n" "repo" "created" "updated" "extras"
for line in "${SUMMARY_LINES[@]}"; do
  IFS='|' read -r r c u e <<< "$line"
  printf "%-28s %8s %8s %8s\n" "$r" "$c" "$u" "$e"
done