provider

type ChatMessage struct {
	Role       string     `json:"role"`
	Content    string     `json:"content"`
	ToolCalls  []ToolCall `json:"tool_calls,omitempty"`
	ToolCallID string     `json:"tool_call_id,omitempty"`
}

type ChatRequest struct {
	Messages []ChatMessage
	Tools    []ToolDefinition
}

type ChatResponse struct {
	Content      string
	ToolCalls    []ToolCall
	FinishReason string // "stop" or "tool_calls"
}

type FunctionCall struct {
	Name      string `json:"name"`
	Arguments string `json:"arguments"`
}

type FunctionDef struct {
	Name        string          `json:"name"`
	Description string          `json:"description"`
	Parameters  json.RawMessage `json:"parameters"`
}

type Provider interface {
	ChatCompletion(ctx context.Context, req ChatRequest) (*ChatResponse, error)
}

type ToolCall struct {
	ID       string       `json:"id"`
	Type     string       `json:"type"`
	Function FunctionCall `json:"function"`
}

type ToolDefinition struct {
	Type     string      `json:"type"`
	Function FunctionDef `json:"function"`
}