package app

import (
	"bytes"
	"context"
	"crypto/sha256"
	"encoding/hex"
	"errors"
	"io"
	"os"
	"testing"
	"time"

	"github.com/geo-platform/tenant-api/internal/ops/domain"
	"github.com/stretchr/testify/require"
)

func TestNormalizeDesktopClientReleaseInputOSS(t *testing.T) {
	t.Parallel()

	customURL := "https://download.example.com/client.dmg"
	ossKey := "desktop/stable/client.dmg"
	got, err := normalizeDesktopClientReleaseInput(DesktopClientReleaseInput{
		Platform:          " Darwin ",
		Arch:              "",
		Channel:           "",
		Version:           "1.2.3",
		DownloadSource:    "oss",
		OSSObjectKey:      &ossKey,
		CustomDownloadURL: &customURL,
		Enabled:           true,
	})

	require.NoError(t, err)
	require.Equal(t, "darwin", got.Platform)
	require.Equal(t, "universal", got.Arch)
	require.Equal(t, "stable", got.Channel)
	require.Equal(t, DesktopClientDownloadSourceOSS, got.DownloadSource)
	require.NotNil(t, got.OSSObjectKey)
	require.Equal(t, "desktop/stable/client.dmg", *got.OSSObjectKey)
	require.Nil(t, got.CustomDownloadURL)
}

func TestNormalizeDesktopClientReleaseInputCustom(t *testing.T) {
	t.Parallel()

	customURL := "https://download.example.com/client.exe"
	ossKey := "desktop/stable/client.exe"
	got, err := normalizeDesktopClientReleaseInput(DesktopClientReleaseInput{
		Platform:          "win32",
		Arch:              "x64",
		Channel:           "stable",
		Version:           "1.2.3",
		DownloadSource:    "custom",
		OSSObjectKey:      &ossKey,
		CustomDownloadURL: &customURL,
		Enabled:           true,
	})

	require.NoError(t, err)
	require.Equal(t, DesktopClientDownloadSourceCustom, got.DownloadSource)
	require.Nil(t, got.OSSObjectKey)
	require.NotNil(t, got.CustomDownloadURL)
	require.Equal(t, customURL, *got.CustomDownloadURL)
}

func TestNormalizeDesktopClientReleaseInputRejectsInvalidDownloadTargets(t *testing.T) {
	t.Parallel()

	invalidOSSKey := "../client.dmg"
	_, err := normalizeDesktopClientReleaseInput(DesktopClientReleaseInput{
		Platform:       "darwin",
		Version:        "1.2.3",
		DownloadSource: "oss",
		OSSObjectKey:   &invalidOSSKey,
	})
	require.Error(t, err)

	invalidURL := "javascript:alert(1)"
	_, err = normalizeDesktopClientReleaseInput(DesktopClientReleaseInput{
		Platform:          "win32",
		Version:           "1.2.3",
		DownloadSource:    "custom",
		CustomDownloadURL: &invalidURL,
	})
	require.Error(t, err)
}

func TestDesktopClientReleaseVersionPolicy(t *testing.T) {
	t.Parallel()

	require.Positive(t, compareVersionStrings("1.2.10", "1.2.9"))
	require.Negative(t, compareVersionStrings("1.2.9", "1.2.10"))

	minVersion := "1.2.0"
	require.True(t, minSupportedVersionRequiresUpdate(&minVersion, "1.1.9"))
	require.False(t, minSupportedVersionRequiresUpdate(&minVersion, "1.2.0"))
}

func TestLatestDesktopClientReleasePrefersVersionThenArch(t *testing.T) {
	t.Parallel()

	oldX64 := domain.DesktopClientRelease{
		ID:        1,
		Platform:  "win32",
		Arch:      "x64",
		Channel:   "stable",
		Version:   "0.1.0",
		UpdatedAt: time.Date(2026, 6, 10, 10, 0, 0, 0, time.UTC),
	}
	newX64 := domain.DesktopClientRelease{
		ID:        2,
		Platform:  "win32",
		Arch:      "x64",
		Channel:   "stable",
		Version:   "0.1.1",
		UpdatedAt: time.Date(2026, 6, 10, 9, 0, 0, 0, time.UTC),
	}
	newUniversal := domain.DesktopClientRelease{
		ID:        3,
		Platform:  "win32",
		Arch:      "universal",
		Channel:   "stable",
		Version:   "0.2.0",
		UpdatedAt: time.Date(2026, 6, 10, 11, 0, 0, 0, time.UTC),
	}

	require.Equal(t, newX64.ID, latestDesktopClientRelease([]domain.DesktopClientRelease{
		newUniversal,
		oldX64,
		newX64,
	}).ID)

	latestByTarget := latestDesktopClientReleasesByTarget([]domain.DesktopClientRelease{
		oldX64,
		newX64,
		newUniversal,
	})
	require.Len(t, latestByTarget, 2)
	require.Equal(t, newUniversal.ID, latestByTarget[0].ID)
	require.Equal(t, newX64.ID, latestByTarget[1].ID)
}

func TestNormalizeDesktopClientReleaseUploadInput(t *testing.T) {
	t.Parallel()

	target, fileName, err := normalizeDesktopClientReleaseUploadInput(DesktopClientReleaseUploadInput{
		Platform: "darwin",
		Arch:     "arm64",
		Channel:  "stable",
		Version:  "1.2.3",
		FileName: "省心推-1.2.3-arm64.dmg",
		Content:  []byte("package"),
	})

	require.NoError(t, err)
	require.Equal(t, "darwin", target.Platform)
	require.Equal(t, "arm64", target.Arch)
	require.Equal(t, "stable", target.Channel)
	require.Equal(t, "省心推-1.2.3-arm64.dmg", fileName)
}

func TestNormalizeDesktopClientReleaseUploadInputDecodesFileName(t *testing.T) {
	t.Parallel()

	_, fileName, err := normalizeDesktopClientReleaseUploadInput(DesktopClientReleaseUploadInput{
		Platform: "darwin",
		Arch:     "arm64",
		Channel:  "stable",
		Version:  "1.2.3",
		FileName: "%E7%9C%81%E5%BF%83%E6%8E%A8-mac-0.1.19.zip",
		Content:  []byte("package"),
	})

	require.NoError(t, err)
	require.Equal(t, "省心推-mac-0.1.19.zip", fileName)
}

func TestNormalizeDesktopClientReleaseUploadInputRejectsInvalidFile(t *testing.T) {
	t.Parallel()

	_, _, err := normalizeDesktopClientReleaseUploadInput(DesktopClientReleaseUploadInput{
		Platform: "darwin",
		Arch:     "arm64",
		Channel:  "stable",
		Version:  "1.2.3",
		FileName: "client.txt",
		Content:  []byte("package"),
	})

	require.Error(t, err)
}

func TestBuildDesktopClientUpdaterFeedYAMLUsesSignedURL(t *testing.T) {
	t.Parallel()

	fileName := "省心推-mac-1.2.3.zip"
	sha256 := "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
	size := int64(1024)
	publishedAt := time.Date(2026, 5, 25, 10, 30, 0, 0, time.UTC)
	content, err := buildDesktopClientUpdaterFeedYAML(&domain.DesktopClientRelease{
		Platform:    "darwin",
		Version:     "1.2.3",
		PublishedAt: &publishedAt,
		UpdatedAt:   publishedAt,
	}, desktopClientReleaseAsset{
		FileName:      &fileName,
		FileSizeBytes: &size,
		SHA256:        &sha256,
	}, "https://oss.example.com/desktop/%E7%9C%81%E5%BF%83%E6%8E%A8.zip?Expires=123&Signature=abc")

	require.NoError(t, err)
	text := string(content)
	require.Contains(t, text, "version: 1.2.3")
	require.Contains(t, text, "sha2: "+sha256)
	require.Contains(t, text, "size: 1024")
	require.Contains(t, text, "Expires=123")
	require.Contains(t, text, "Signature=abc")
	require.NotContains(t, text, "%25E7")
}

func TestValidateDesktopClientUpdaterPackage(t *testing.T) {
	t.Parallel()

	zipName := "省心推-mac-1.2.3.zip"
	require.NoError(t, validateDesktopClientUpdaterPackage("darwin", &zipName, ""))

	dmgName := "省心推-mac-1.2.3.dmg"
	require.Error(t, validateDesktopClientUpdaterPackage("darwin", &dmgName, ""))

	exeURL := "https://download.example.com/%E7%9C%81%E5%BF%83%E6%8E%A8%20Setup%201.2.3.exe"
	require.NoError(t, validateDesktopClientUpdaterPackage("win32", nil, exeURL))
}

func TestBuildDesktopClientReleaseObjectKeyReusesContentAddress(t *testing.T) {
	t.Parallel()

	sum := "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"

	first := buildDesktopClientReleaseObjectKey(sum, "省心推 Setup 1.2.3.exe")
	second := buildDesktopClientReleaseObjectKey(sum, "renamed.exe")

	require.Equal(t, first, second)
	require.Equal(t, "desktop-client/releases/blobs/"+sum+".exe", first)
}

func TestResolveDownloadURLResultUsesSignedDownloadURL(t *testing.T) {
	t.Parallel()

	objectKey := "desktop-client/releases/blobs/client.zip"
	storage := &desktopReleaseDownloadURLStorage{}
	svc := &DesktopClientReleaseService{storage: storage}

	result, err := svc.resolveDownloadURLResult(&domain.DesktopClientRelease{
		DownloadSource: DesktopClientDownloadSourceOSS,
		OSSObjectKey:   &objectKey,
	})

	require.NoError(t, err)
	require.Equal(t, "https://oss.example.test/signed/client.zip?Expires=123", result.DownloadURL)
	require.Equal(t, []string{objectKey}, storage.downloadURLCalls)
	require.Empty(t, storage.publicURLCalls)
}

func TestDesktopClientReleaseChunkedUploadCompletesOutOfOrder(t *testing.T) {
	t.Parallel()

	storage := &desktopReleaseDownloadURLStorage{
		existsByKey: map[string]bool{},
		objects:     map[string][]byte{},
	}
	svc := NewDesktopClientReleaseService(nil, storage, nil).WithReleaseUploadDir(t.TempDir())
	content := bytes.Repeat([]byte("release-package-"), 1024*1024)
	sum := sha256.Sum256(content)
	wantSHA := hex.EncodeToString(sum[:])

	initResult, err := svc.InitiateChunkedUpload(context.Background(), DesktopClientReleaseChunkedUploadInitInput{
		Platform:       "darwin",
		Arch:           "arm64",
		Channel:        "stable",
		Version:        "1.2.3",
		Kind:           DesktopClientAssetKindInstaller,
		FileName:       "client.dmg",
		FileSizeBytes:  int64(len(content)),
		ChunkSizeBytes: 5 * 1024 * 1024,
	})
	require.NoError(t, err)
	require.Equal(t, 4, initResult.ChunkCount)

	order := []int{2, 0, 3, 1}
	for _, index := range order {
		start := int64(index) * initResult.ChunkSizeBytes
		end := min(start+initResult.ChunkSizeBytes, int64(len(content)))
		result, err := svc.UploadChunk(context.Background(), DesktopClientReleaseChunkUploadInput{
			UploadID:         initResult.UploadID,
			ChunkIndex:       index,
			ContentReader:    bytes.NewReader(content[start:end]),
			ContentSizeBytes: end - start,
		})
		require.NoError(t, err)
		require.Equal(t, index, result.ChunkIndex)
	}

	result, err := svc.CompleteChunkedUpload(context.Background(), initResult.UploadID)
	require.NoError(t, err)
	require.Equal(t, wantSHA, result.SHA256)
	require.Equal(t, int64(len(content)), result.FileSizeBytes)
	require.Equal(t, "desktop-client/releases/blobs/"+wantSHA+".dmg", result.OSSObjectKey)
	require.Equal(t, content, storage.objects[result.OSSObjectKey])
	_, err = os.Stat(svc.desktopReleaseUploadSessionDir(initResult.UploadID))
	require.True(t, errors.Is(err, os.ErrNotExist))
}

type desktopReleaseDownloadURLStorage struct {
	publicURLCalls   []string
	downloadURLCalls []string
	existsByKey      map[string]bool
	objects          map[string][]byte
}

func (s *desktopReleaseDownloadURLStorage) Validate() error {
	return nil
}

func (s *desktopReleaseDownloadURLStorage) PutBytes(context.Context, string, []byte, string) error {
	return nil
}

func (s *desktopReleaseDownloadURLStorage) PutReader(_ context.Context, objectKey string, reader io.Reader, _ int64, _ string) error {
	if s.objects == nil {
		s.objects = map[string][]byte{}
	}
	content, err := io.ReadAll(reader)
	if err != nil {
		return err
	}
	s.objects[objectKey] = content
	if s.existsByKey == nil {
		s.existsByKey = map[string]bool{}
	}
	s.existsByKey[objectKey] = true
	return nil
}

func (s *desktopReleaseDownloadURLStorage) GetBytes(context.Context, string) ([]byte, error) {
	return nil, errors.New("not implemented")
}

func (s *desktopReleaseDownloadURLStorage) Exists(_ context.Context, objectKey string) (bool, error) {
	if s.existsByKey != nil {
		return s.existsByKey[objectKey], nil
	}
	return true, nil
}

func (s *desktopReleaseDownloadURLStorage) Delete(context.Context, string) error {
	return nil
}

func (s *desktopReleaseDownloadURLStorage) PublicURL(objectKey string) (string, error) {
	s.publicURLCalls = append(s.publicURLCalls, objectKey)
	return "", errors.New("public url should not be used for private release downloads")
}

func (s *desktopReleaseDownloadURLStorage) DownloadURL(objectKey string) (string, error) {
	s.downloadURLCalls = append(s.downloadURLCalls, objectKey)
	return "https://oss.example.test/signed/client.zip?Expires=123", nil
}