package helper

import (
	"slices"
	"testing"
	"webp_server_go/config"

	"github.com/stretchr/testify/assert"
	"github.com/valyala/fasthttp"
)

func TestMain(m *testing.M) {
	config.ConfigPath = "../config.json"
	config.LoadConfig()
	m.Run()
	config.ConfigPath = "config.json"
}

func TestFileCount(t *testing.T) {
	// test helper dir
	count := FileCount("./")
	assert.Equal(t, int64(4), count)
}

func TestImageExists(t *testing.T) {
	t.Run("file not exists", func(t *testing.T) {
		assert.False(t, ImageExists("dgyuaikdsa"))
	})

	// TODO: how to test lock?

	t.Run("test dir", func(t *testing.T) {
		assert.False(t, ImageExists("/tmp"))
	})

	t.Run("test file", func(t *testing.T) {
		assert.True(t, ImageExists("./helper_test.go"))
	})
}

func TestCheckAllowedType(t *testing.T) {
	t.Run("not allowed type", func(t *testing.T) {
		assert.False(t, CheckAllowedType("./helper_test.go"))
	})

	t.Run("allowed type", func(t *testing.T) {
		assert.True(t, CheckAllowedType("test.jpg"))
	})
}

func TestGuessSupportedFormat(t *testing.T) {
	tests := []struct {
		name      string
		userAgent string
		accept    string
		expected  []string
	}{
		{
			name:      "WebP/AVIF Supported",
			userAgent: "iPhone OS 16",
			accept:    "image/webp, image/png",
			expected:  []string{"raw", "webp", "avif"},
		},
		{
			name:      "Both Supported",
			userAgent: "iPhone OS 16",
			accept:    "image/webp, image/avif",
			expected:  []string{"raw", "webp", "avif"},
		},
		{
			name:      "No Supported Formats",
			userAgent: "Unknown OS",
			accept:    "image/jpeg, image/gif",
			expected:  []string{"raw"},
		},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			header := &fasthttp.RequestHeader{}
			header.Set("user-agent", test.userAgent)
			header.Set("accept", test.accept)

			result := GuessSupportedFormat(header)

			if len(result) != len(test.expected) {
				t.Errorf("Expected %v, but got %v", test.expected, result)
			}

			for _, format := range test.expected {
				if !slices.Contains(result, format) {
					t.Errorf("Expected format %s is not in the result", format)
				}
			}
		})
	}
}