add model config profiles and cost tracking

- models.json: named profiles with base url/key/model and per-million token pricing
- support --config <Name> to load a profile, replacing --model/--base-url/--api-key
- accumulate input/output token usage across all API calls in the client
- compute time + token cost per case, written to {out}_cost.json behind opt-in --cost flag

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -3,3 +3,4 @@
 *.html
 
 result.yaml
+__pycache__/

hk_case_extractor.py

@@ -67,7 +67,8 @@ import argparse
 import json
 import re
 import sys
-from dataclasses import dataclass
+import time
+from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Any
 
@@ -85,6 +86,45 @@ DEFAULT_API_KEY = "ollama"  # Ollama 不需要真實 key，但 API 需要提供
 DEFAULT_TIMEOUT = 600  # 增加到 10 分鐘，適應遠程服務器
 MAX_RETRIES = 2
 
+DEFAULT_MODELS_FILE = "models.json"
+
+
+# =============================================================================
+# 模型配置（models.json）：按配置名加載 base_url / api_key / model / 計費價格
+# =============================================================================
+
+def load_model_profile(name: str, models_file: str = DEFAULT_MODELS_FILE) -> dict:
+    """從 models.json 按 Name 加載一個模型配置。
+
+    配置格式（數組）：
+      [{"Name":..., "source":..., "BaseApiUrl":..., "ApiKey":...,
+        "model":..., "input_price":..., "output_price":..., "price_unit":...}]
+
+    找不到文件或配置名時直接退出並提示可用配置。
+    """
+    path = Path(models_file)
+    if not path.exists():
+        print(f"❌ 找不到模型配置文件：{models_file}", file=sys.stderr)
+        sys.exit(1)
+
+    try:
+        profiles = json.loads(path.read_text(encoding="utf-8"))
+    except json.JSONDecodeError as e:
+        print(f"❌ 模型配置文件不是有效的 JSON：{e}", file=sys.stderr)
+        sys.exit(1)
+
+    if not isinstance(profiles, list):
+        print("❌ 模型配置文件應為配置對象組成的數組", file=sys.stderr)
+        sys.exit(1)
+
+    for p in profiles:
+        if p.get("Name") == name:
+            return p
+
+    available = [p.get("Name") for p in profiles]
+    print(f"❌ 配置 '{name}' 不存在。可用配置：{available}", file=sys.stderr)
+    sys.exit(1)
+
 
 # =============================================================================
 # 0. 語言檢測
@@ -450,6 +490,15 @@ class OpenAICompatibleClient:
     api_key: str = DEFAULT_API_KEY
     timeout: int = DEFAULT_TIMEOUT
 
+    # token 用量累計（跨所有調用，含重試）
+    total_input_tokens: int = field(default=0, init=False)
+    total_output_tokens: int = field(default=0, init=False)
+    num_calls: int = field(default=0, init=False)
+
+    @property
+    def total_tokens(self) -> int:
+        return self.total_input_tokens + self.total_output_tokens
+
     def chat_json(self, system: str, user: str, schema: dict,
                   temperature: float = 0.0,
                   max_tokens: int = 4096) -> dict:
@@ -494,6 +543,12 @@ class OpenAICompatibleClient:
             print(f"   響應內容: {r.text[:500]}", file=sys.stderr)
             raise
         
+        # 累計 token 用量（OpenAI 兼容端點通常在 usage 字段返回）
+        usage = response_data.get("usage") or {}
+        self.total_input_tokens += int(usage.get("prompt_tokens", 0) or 0)
+        self.total_output_tokens += int(usage.get("completion_tokens", 0) or 0)
+        self.num_calls += 1
+
         # 提取內容
         if "choices" not in response_data or not response_data["choices"]:
             print(f"❌ API 響應缺少 choices 字段", file=sys.stderr)
@@ -1213,7 +1268,7 @@ def run_pipeline(text: str, model: str, base_url: str, api_key: str,
                  entities_window: int = 400,
                  entities_max: int = 6500,
                  analysis_window: int = 500,
-                 analysis_max: int = 6500) -> dict:
+                 analysis_max: int = 6500) -> tuple[dict, OpenAICompatibleClient]:
     log = lambda m: print(m, file=sys.stderr)
 
     log("[0/7] 檢測語言...")
@@ -1277,7 +1332,55 @@ def run_pipeline(text: str, model: str, base_url: str, api_key: str,
     for w in warnings:
         log(f"  ⚠️  {w}")
 
-    return final
+    return final, client
+
+
+# =============================================================================
+# 5.5 成本統計：根據 models.json 計費價格計算本次抽取消耗
+# =============================================================================
+
+def compute_cost(client: OpenAICompatibleClient,
+                 elapsed_seconds: float,
+                 profile: dict | None) -> dict:
+    """根據 token 用量、耗時和模型計費價格計算本次抽取成本。
+
+    價格單位為「每百萬 token 價格」：
+      input_cost  = input_tokens  / 1_000_000 * input_price
+      output_cost = output_tokens / 1_000_000 * output_price
+    profile 為 None（未使用 --config）時，價格相關字段為 null。
+    """
+    input_tokens = client.total_input_tokens
+    output_tokens = client.total_output_tokens
+
+    input_price = output_price = None
+    price_unit = None
+    if profile is not None:
+        input_price = float(profile.get("input_price") or 0)
+        output_price = float(profile.get("output_price") or 0)
+        price_unit = profile.get("price_unit")
+
+    input_cost = output_cost = total_cost = None
+    if input_price is not None and output_price is not None:
+        input_cost = round(input_tokens / 1_000_000 * input_price, 6)
+        output_cost = round(output_tokens / 1_000_000 * output_price, 6)
+        total_cost = round(input_cost + output_cost, 6)
+
+    return {
+        "config_name": profile.get("Name") if profile else None,
+        "source": profile.get("source") if profile else None,
+        "model": client.model,
+        "elapsed_seconds": round(elapsed_seconds, 3),
+        "num_api_calls": client.num_calls,
+        "input_tokens": input_tokens,
+        "output_tokens": output_tokens,
+        "total_tokens": client.total_tokens,
+        "input_price_per_million": input_price,
+        "output_price_per_million": output_price,
+        "price_unit": price_unit,
+        "input_cost": input_cost,
+        "output_cost": output_cost,
+        "total_cost": total_cost,
+    }
 
 
 # =============================================================================
@@ -1322,6 +1425,10 @@ def main() -> None:
         description="香港判決書結構化抽取（OpenAI 兼容 API）",
         epilog="""
 示例用法：
+  # 使用 models.json 中的配置名稱（推薦，省去多個參數）
+  python hk_case_extractor.py case.txt --config openrouter-claude-sonnet --out result.yaml
+  # 成本統計會寫入 result_cost.json
+
   # 使用本地 Ollama
   python hk_case_extractor.py case.txt --model qwen2.5:7b-instruct
 
@@ -1347,6 +1454,11 @@ def main() -> None:
         formatter_class=argparse.RawDescriptionHelpFormatter
     )
     ap.add_argument("input", help="判決書文本路徑（.txt 或 .json）")
+    ap.add_argument("--config", default=None,
+                    help="models.json 中的配置名稱（Name），"
+                         "使用後可省略 --model/--base-url/--api-key")
+    ap.add_argument("--models-file", default=DEFAULT_MODELS_FILE,
+                    help=f"模型配置文件路徑（默認：{DEFAULT_MODELS_FILE}）")
     ap.add_argument("--model", default=DEFAULT_MODEL,
                     help=f"模型名稱（默認：{DEFAULT_MODEL}）")
     ap.add_argument("--base-url", default=DEFAULT_BASE_URL,
@@ -1354,6 +1466,8 @@ def main() -> None:
     ap.add_argument("--api-key", default=DEFAULT_API_KEY,
                     help="API key（Ollama 可忽略）")
     ap.add_argument("--out", default=None, help="輸出 YAML 路徑（默認 stdout）")
+    ap.add_argument("--cost", action="store_true",
+                    help="輸出成本統計到 {輸出文件名}_cost.json（默認不輸出）")
     ap.add_argument("--debug-dump", default=None,
                     help="額外輸出原始 JSON 結果到該路徑（便於 diff）")
     
@@ -1373,6 +1487,20 @@ def main() -> None:
     
     args = ap.parse_args()
 
+    # 解析模型配置：--config 優先，未命中的字段回退到命令行/默認值
+    profile: dict | None = None
+    if args.config:
+        profile = load_model_profile(args.config, args.models_file)
+        model = profile.get("model") or args.model
+        base_url = profile.get("BaseApiUrl") or args.base_url
+        api_key = profile.get("ApiKey") or args.api_key
+        print(f"使用配置 '{args.config}'：model={model}, base_url={base_url}",
+              file=sys.stderr)
+    else:
+        model = args.model
+        base_url = args.base_url
+        api_key = args.api_key
+
     # 支持从 .json 文件的 content 字段读取
     input_path = Path(args.input)
     if input_path.suffix.lower() == '.json':
@@ -1385,10 +1513,27 @@ def main() -> None:
     else:
         text = input_path.read_text(encoding="utf-8")
     
-    result = run_pipeline(text, args.model, args.base_url, args.api_key,
+    start = time.perf_counter()
-                          args.head_length, args.tail_length,
+    result, client = run_pipeline(text, model, base_url, api_key,
-                          args.entities_window, args.entities_max,
+                                  args.head_length, args.tail_length,
-                          args.analysis_window, args.analysis_max)
+                                  args.entities_window, args.entities_max,
+                                  args.analysis_window, args.analysis_max)
+    elapsed = time.perf_counter() - start
+
+    # 成本統計：僅在 --cost 時輸出到 {summary_file_name}_cost.json
+    if args.cost:
+        cost = compute_cost(client, elapsed, profile)
+        if args.out:
+            cost_path = Path(args.out).with_name(Path(args.out).stem + "_cost.json")
+        else:
+            cost_path = input_path.with_name(input_path.stem + "_cost.json")
+        cost_path.parent.mkdir(parents=True, exist_ok=True)
+        cost_path.write_text(json.dumps(cost, ensure_ascii=False, indent=2),
+                             encoding="utf-8")
+        print(f"💰 成本統計已寫入 {cost_path}：耗時 {cost['elapsed_seconds']}s，"
+              f"input={cost['input_tokens']} output={cost['output_tokens']} "
+              f"total_cost={cost['total_cost']} {cost['price_unit'] or ''}",
+              file=sys.stderr)
 
     if args.debug_dump:
         debug_path = Path(args.debug_dump)

models.json

@@ -0,0 +1,42 @@
+[
+  {
+    "Name": "ollama-qwen",
+    "source": "ollama",
+    "BaseApiUrl": "http://localhost:11434/v1",
+    "ApiKey": "ollama",
+    "model": "qwen2.5:7b-instruct",
+    "input_price": 0,
+    "output_price": 0,
+    "price_unit": "USD"
+  },
+  {
+    "Name": "openrouter-claude-sonnet",
+    "source": "openrouter",
+    "BaseApiUrl": "https://openrouter.ai/api/v1",
+    "ApiKey": "",
+    "model": "anthropic/claude-3.5-sonnet",
+    "input_price": 3.0,
+    "output_price": 15.0,
+    "price_unit": "USD"
+  },
+  {
+    "Name": "openai-gpt-4o",
+    "source": "openai",
+    "BaseApiUrl": "https://api.openai.com/v1",
+    "ApiKey": "",
+    "model": "gpt-4o",
+    "input_price": 2.5,
+    "output_price": 10.0,
+    "price_unit": "USD"
+  },
+  {
+    "Name": "deepseek-chat",
+    "source": "deepseek",
+    "BaseApiUrl": "https://api.deepseek.com/v1",
+    "ApiKey": "",
+    "model": "deepseek-chat",
+    "input_price": 2.0,
+    "output_price": 8.0,
+    "price_unit": "CNY"
+  }
+]