package dcf_test

import (
	"crypto/sha256"
	"encoding/hex"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"git.eeqj.de/sneak/dcf/pkg/dcf"
)

// newStore builds a store with two images and one video of known sizes,
// so the count and size accessors have something deterministic to
// report.
func newStore(root string) *dcf.Store {
	return &dcf.Store{
		RootDirectory: root,
		Images: []*dcf.Image{
			{Object: dcf.Object{
				StoreRoot: root,
				Path:      "DCIM/100MSDCF/DSC00001.ARW",
				Size:      2000,
				Extension: ".ARW",
			}},
			{Object: dcf.Object{
				StoreRoot: root,
				Path:      "DCIM/100MSDCF/DSC00002.JPG",
				Size:      500,
				Extension: ".JPG",
			}},
		},
		Videos: []*dcf.Video{
			{Object: dcf.Object{
				StoreRoot: root,
				Path:      "PRIVATE/M4ROOT/CLIP/C0001.MP4",
				Size:      9000,
				Extension: ".MP4",
			}},
		},
	}
}

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

	object := dcf.Object{
		StoreRoot: filepath.Join("/mnt", "card"),
		Path:      filepath.Join("DCIM", "100MSDCF", "DSC00001.ARW"),
	}

	want := filepath.Join("/mnt", "card", "DCIM", "100MSDCF", "DSC00001.ARW")
	if got := object.FullFilePath(); got != want {
		t.Fatalf("FullFilePath() = %q, want %q", got, want)
	}
}

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

	store := newStore("/mnt/card")

	if got := store.ImagesCount(); got != 2 {
		t.Errorf("ImagesCount() = %d, want 2", got)
	}

	if got := store.VideosCount(); got != 1 {
		t.Errorf("VideosCount() = %d, want 1", got)
	}
}

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

	store := newStore("/mnt/card")

	if got := store.TotalImageSize(); got != 2500 {
		t.Errorf("TotalImageSize() = %d, want 2500", got)
	}

	if got := store.TotalVideoSize(); got != 9000 {
		t.Errorf("TotalVideoSize() = %d, want 9000", got)
	}

	if got := store.TotalSize(); got != 11500 {
		t.Errorf("TotalSize() = %d, want 11500", got)
	}
}

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

	store := dcf.Store{RootDirectory: "/mnt/empty"}
	if got := store.TotalSize(); got != 0 {
		t.Fatalf("TotalSize() = %d, want 0", got)
	}
}

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

	got := newStore("/mnt/card").String()
	for _, want := range []string{"/mnt/card", "Images: 2", "Videos: 1", "12 kB"} {
		if !strings.Contains(got, want) {
			t.Errorf("String() = %q, want it to contain %q", got, want)
		}
	}
}

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

	image := dcf.Image{Object: dcf.Object{
		Path:      "DCIM/100MSDCF/DSC00001.ARW",
		Size:      2000,
		Extension: ".ARW",
	}}

	want := "Image{Path: DCIM/100MSDCF/DSC00001.ARW, Size: 2000, " +
		"Extension: .ARW}"
	if got := image.String(); got != want {
		t.Errorf("Image.String() = %q, want %q", got, want)
	}

	video := dcf.Video{Object: dcf.Object{
		Path:      "PRIVATE/M4ROOT/CLIP/C0001.MP4",
		Size:      9000,
		Extension: ".MP4",
	}}

	want = "Video{Path: PRIVATE/M4ROOT/CLIP/C0001.MP4, Size: 9000, " +
		"Extension: .MP4}"
	if got := video.String(); got != want {
		t.Errorf("Video.String() = %q, want %q", got, want)
	}
}

func TestObjectHashMatchesSHA256OfFile(t *testing.T) {
	t.Parallel()

	root := t.TempDir()
	contents := []byte("DSC00001.ARW contents")

	err := os.MkdirAll(filepath.Join(root, "DCIM"), 0o750)
	if err != nil {
		t.Fatalf("MkdirAll: %v", err)
	}

	err = os.WriteFile(filepath.Join(root, "DCIM", "a.arw"), contents, 0o600)
	if err != nil {
		t.Fatalf("WriteFile: %v", err)
	}

	object := dcf.Object{StoreRoot: root, Path: filepath.Join("DCIM", "a.arw")}

	got, err := object.Hash()
	if err != nil {
		t.Fatalf("Hash() returned error: %v", err)
	}

	sum := sha256.Sum256(contents)
	if want := hex.EncodeToString(sum[:]); got != want {
		t.Fatalf("Hash() = %q, want %q", got, want)
	}
}

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

	object := dcf.Object{StoreRoot: t.TempDir(), Path: "absent.jpg"}

	_, err := object.Hash()
	if err == nil {
		t.Fatal("Hash() on a missing file returned no error")
	}
}