package claudeconv

import (
	"strings"

	"ds2api/internal/config"
)

func ConvertClaudeToDeepSeek(claudeReq map[string]any, aliasProvider config.ModelAliasReader, defaultClaudeModel string) map[string]any {
	messages, _ := claudeReq["messages"].([]any)
	model, _ := claudeReq["model"].(string)
	if model == "" {
		model = defaultClaudeModel
	}

	dsModel, ok := config.ResolveModel(aliasProvider, model)
	if !ok || strings.TrimSpace(dsModel) == "" {
		dsModel = "deepseek-v4-flash"
	}

	convertedMessages := make([]any, 0, len(messages)+1)
	if system, ok := claudeReq["system"].(string); ok && system != "" {
		convertedMessages = append(convertedMessages, map[string]any{"role": "system", "content": system})
	}
	convertedMessages = append(convertedMessages, messages...)

	out := map[string]any{"model": dsModel, "messages": convertedMessages}
	for _, k := range []string{"temperature", "top_p", "stream"} {
		if v, ok := claudeReq[k]; ok {
			out[k] = v
		}
	}
	if stopSeq, ok := claudeReq["stop_sequences"]; ok {
		out["stop"] = stopSeq
	}
	return out
}