package service

import (
	"net/http/httptest"
	"testing"

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/require"
)

func buildChannelAffinityTemplateContextForTest(meta channelAffinityMeta) *gin.Context {
	rec := httptest.NewRecorder()
	ctx, _ := gin.CreateTestContext(rec)
	setChannelAffinityContext(ctx, meta)
	return ctx
}

func TestApplyChannelAffinityOverrideTemplate_NoTemplate(t *testing.T) {
	ctx := buildChannelAffinityTemplateContextForTest(channelAffinityMeta{
		RuleName: "rule-no-template",
	})
	base := map[string]interface{}{
		"temperature": 0.7,
	}

	merged, applied := ApplyChannelAffinityOverrideTemplate(ctx, base)
	require.False(t, applied)
	require.Equal(t, base, merged)
}

func TestApplyChannelAffinityOverrideTemplate_MergeTemplate(t *testing.T) {
	ctx := buildChannelAffinityTemplateContextForTest(channelAffinityMeta{
		RuleName: "rule-with-template",
		ParamTemplate: map[string]interface{}{
			"temperature": 0.2,
			"top_p":       0.95,
		},
		UsingGroup:     "default",
		ModelName:      "gpt-4.1",
		RequestPath:    "/v1/responses",
		KeySourceType:  "gjson",
		KeySourcePath:  "prompt_cache_key",
		KeyHint:        "abcd...wxyz",
		KeyFingerprint: "abcd1234",
	})
	base := map[string]interface{}{
		"temperature": 0.7,
		"max_tokens":  2000,
	}

	merged, applied := ApplyChannelAffinityOverrideTemplate(ctx, base)
	require.True(t, applied)
	require.Equal(t, 0.2, merged["temperature"])
	require.Equal(t, 0.95, merged["top_p"])
	require.Equal(t, 2000, merged["max_tokens"])
	require.Equal(t, 0.7, base["temperature"])

	anyInfo, ok := ctx.Get(ginKeyChannelAffinityLogInfo)
	require.True(t, ok)
	info, ok := anyInfo.(map[string]interface{})
	require.True(t, ok)
	overrideInfoAny, ok := info["override_template"]
	require.True(t, ok)
	overrideInfo, ok := overrideInfoAny.(map[string]interface{})
	require.True(t, ok)
	require.Equal(t, true, overrideInfo["applied"])
	require.Equal(t, "rule-with-template", overrideInfo["rule_name"])
	require.EqualValues(t, 2, overrideInfo["param_override_keys"])
}