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package store

import (
	"os"
	"path/filepath"
	"testing"
	"time"
)

func TestLocalStoreSeqChangesOnEdit(t *testing.T) {
	root := t.TempDir()
	user := "u@d.com"
	dir := filepath.Join(root, user, "repo")
	if err := os.MkdirAll(dir, 0o755); err != nil {
		t.Fatal(err)
	}
	f := filepath.Join(dir, "a.txt")
	if err := os.WriteFile(f, []byte("hello"), 0o644); err != nil {
		t.Fatal(err)
	}

	s := NewLocalStore(root)
	seq1, err := s.Seq(user + "/repo")
	if err != nil {
		t.Fatalf("Seq: %v", err)
	}
	if seq1 == 0 {
		t.Fatal("expected non-zero seq")
	}

	// Touch a file under the dir with a strictly later mtime; Seq must change.
	later := time.Now().Add(2 * time.Second)
	if err := os.Chtimes(f, later, later); err != nil {
		t.Fatal(err)
	}
	seq2, err := s.Seq(user + "/repo")
	if err != nil {
		t.Fatalf("Seq: %v", err)
	}
	if seq2 == seq1 {
		t.Fatalf("expected Seq to change after edit: %d == %d", seq1, seq2)
	}
}

func TestLocalStoreSeqNotFound(t *testing.T) {
	s := NewLocalStore(t.TempDir())
	if _, err := s.Seq("u@d.com/missing"); err != ErrNotFound {
		t.Fatalf("want ErrNotFound, got %v", err)
	}
}

func TestLocalStorePutCreatesParents(t *testing.T) {
	s := NewLocalStore(t.TempDir())
	p := "u@d.com/repo.git/objects/pack/pack-abc.pack"
	if err := s.Put(p, []byte("data")); err != nil {
		t.Fatalf("Put: %v", err)
	}
	got, err := s.Get(p)
	if err != nil {
		t.Fatalf("Get after Put: %v", err)
	}
	if string(got) != "data" {
		t.Fatalf("got %q, want %q", got, "data")
	}
	// The parent directory must have been created.
	if isDir, err := s.Stat("u@d.com/repo.git/objects/pack"); err != nil || !isDir {
		t.Fatalf("parent dir Stat: isDir=%v err=%v", isDir, err)
	}
}

func TestLocalStorePutOverwrites(t *testing.T) {
	s := NewLocalStore(t.TempDir())
	p := "u@d.com/repo.git/HEAD"
	if err := s.Put(p, []byte("ref: refs/heads/main\n")); err != nil {
		t.Fatal(err)
	}
	if err := s.Put(p, []byte("ref: refs/heads/dev\n")); err != nil {
		t.Fatal(err)
	}
	got, err := s.Get(p)
	if err != nil {
		t.Fatal(err)
	}
	if string(got) != "ref: refs/heads/dev\n" {
		t.Fatalf("overwrite failed: got %q", got)
	}
}

func TestLocalStoreDelete(t *testing.T) {
	s := NewLocalStore(t.TempDir())
	p := "u@d.com/repo.git/refs/heads/tmp"
	if err := s.Put(p, []byte("hash")); err != nil {
		t.Fatal(err)
	}
	if err := s.Delete(p); err != nil {
		t.Fatalf("Delete: %v", err)
	}
	if _, err := s.Get(p); err != ErrNotFound {
		t.Fatalf("want ErrNotFound after delete, got %v", err)
	}
	// Deleting a missing path reports ErrNotFound.
	if err := s.Delete(p); err != ErrNotFound {
		t.Fatalf("delete-missing: want ErrNotFound, got %v", err)
	}
}

// Both concrete stores must satisfy WriteStore.
var (
	_ WriteStore = (*LocalStore)(nil)
	_ WriteStore = (*UpspinStore)(nil)
)