package llm

import (
	"context"
	"testing"
)

func TestWithTemperature(t *testing.T) {
	cfg := &requestConfig{}
	WithTemperature(0.7)(cfg)
	if cfg.temperature == nil || *cfg.temperature != 0.7 {
		t.Errorf("expected temperature 0.7, got %v", cfg.temperature)
	}
}

func TestWithMaxTokens(t *testing.T) {
	cfg := &requestConfig{}
	WithMaxTokens(256)(cfg)
	if cfg.maxTokens == nil || *cfg.maxTokens != 256 {
		t.Errorf("expected maxTokens 256, got %v", cfg.maxTokens)
	}
}

func TestWithTopP(t *testing.T) {
	cfg := &requestConfig{}
	WithTopP(0.95)(cfg)
	if cfg.topP == nil || *cfg.topP != 0.95 {
		t.Errorf("expected topP 0.95, got %v", cfg.topP)
	}
}

func TestWithStop(t *testing.T) {
	cfg := &requestConfig{}
	WithStop("END", "STOP", "###")(cfg)
	if len(cfg.stop) != 3 {
		t.Fatalf("expected 3 stop sequences, got %d", len(cfg.stop))
	}
	if cfg.stop[0] != "END" || cfg.stop[1] != "STOP" || cfg.stop[2] != "###" {
		t.Errorf("unexpected stop sequences: %v", cfg.stop)
	}
}

func TestWithTools(t *testing.T) {
	tool := DefineSimple("test", "A test tool", func(ctx context.Context) (string, error) {
		return "ok", nil
	})
	tb := NewToolBox(tool)

	cfg := &requestConfig{}
	WithTools(tb)(cfg)
	if cfg.tools == nil {
		t.Fatal("expected tools to be set")
	}
	if len(cfg.tools.AllTools()) != 1 {
		t.Errorf("expected 1 tool, got %d", len(cfg.tools.AllTools()))
	}
}

func TestBuildProviderRequest(t *testing.T) {
	tool := DefineSimple("greet", "Greets", func(ctx context.Context) (string, error) {
		return "hi", nil
	})
	tb := NewToolBox(tool)

	temp := 0.8
	maxTok := 512
	topP := 0.9

	cfg := &requestConfig{
		tools:       tb,
		temperature: &temp,
		maxTokens:   &maxTok,
		topP:        &topP,
		stop:        []string{"END"},
	}

	msgs := []Message{
		SystemMessage("be nice"),
		UserMessage("hello"),
	}

	req := buildProviderRequest("test-model", msgs, cfg)

	if req.Model != "test-model" {
		t.Errorf("expected model 'test-model', got %q", req.Model)
	}
	if len(req.Messages) != 2 {
		t.Fatalf("expected 2 messages, got %d", len(req.Messages))
	}
	if req.Messages[0].Role != "system" {
		t.Errorf("expected first message role='system', got %q", req.Messages[0].Role)
	}
	if req.Messages[1].Role != "user" {
		t.Errorf("expected second message role='user', got %q", req.Messages[1].Role)
	}
	if req.Temperature == nil || *req.Temperature != 0.8 {
		t.Errorf("expected temperature 0.8, got %v", req.Temperature)
	}
	if req.MaxTokens == nil || *req.MaxTokens != 512 {
		t.Errorf("expected maxTokens 512, got %v", req.MaxTokens)
	}
	if req.TopP == nil || *req.TopP != 0.9 {
		t.Errorf("expected topP 0.9, got %v", req.TopP)
	}
	if len(req.Stop) != 1 || req.Stop[0] != "END" {
		t.Errorf("expected stop=[END], got %v", req.Stop)
	}
	if len(req.Tools) != 1 {
		t.Fatalf("expected 1 tool, got %d", len(req.Tools))
	}
	if req.Tools[0].Name != "greet" {
		t.Errorf("expected tool name 'greet', got %q", req.Tools[0].Name)
	}
}

func TestBuildProviderRequest_EmptyConfig(t *testing.T) {
	cfg := &requestConfig{}
	msgs := []Message{UserMessage("hi")}

	req := buildProviderRequest("model", msgs, cfg)

	if req.Temperature != nil {
		t.Errorf("expected nil temperature, got %v", req.Temperature)
	}
	if req.MaxTokens != nil {
		t.Errorf("expected nil maxTokens, got %v", req.MaxTokens)
	}
	if req.TopP != nil {
		t.Errorf("expected nil topP, got %v", req.TopP)
	}
	if len(req.Stop) != 0 {
		t.Errorf("expected no stop sequences, got %v", req.Stop)
	}
	if len(req.Tools) != 0 {
		t.Errorf("expected no tools, got %d", len(req.Tools))
	}
}