//
//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

package models

// ParserConfig maps a protocol to its usage parsers. Drivers select a
// ParserConfig instead of implementing usage extraction individually.
type ParserConfig struct {
	// Protocol is the protocol identifier (e.g. "openai", "claude").
	Protocol string
	// ResponseParser extracts usage from a non-streaming response body.
	ResponseParser func(map[string]any) (*TokenUsage, bool)
	// StreamParser extracts usage from one streaming event.
	StreamParser func(map[string]any) (*TokenUsage, bool)
}

// OpenAIParserConfig is the ParserConfig for OpenAI-compatible APIs
// (NVIDIA NIM, DeepSeek, Aliyun, Moonshot, xAI, OpenRouter, ...).
var OpenAIParserConfig = &ParserConfig{
	Protocol:       "openai",
	ResponseParser: extractOpenAIUsage,
	StreamParser:   extractOpenAIStreamUsage,
}