package files

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

	"verstak/internal/core/storage"
)

func openTestDB(t *testing.T) *storage.DB {
	t.Helper()
	dir := t.TempDir()
	db, err := storage.Open(filepath.Join(dir, "test.db"))
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	t.Cleanup(func() { db.Close() })
	return db
}

func TestAddExternal(t *testing.T) {
	db := openTestDB(t)
	// Run migration 002 manually since storage.Open already applied it.
	// We can verify the table exists by inserting.
	filesSvc := NewService(db, t.TempDir())

	// Create a real temp file to register.
	tmpDir := t.TempDir()
	tmpFile := filepath.Join(tmpDir, "test.txt")
	if err := os.WriteFile(tmpFile, []byte("hello world"), 0o640); err != nil {
		t.Fatal(err)
	}

	rec, err := filesSvc.AddExternal("node-1", tmpFile)
	if err != nil {
		t.Fatalf("AddExternal: %v", err)
	}
	if rec.ID == "" {
		t.Fatal("empty id")
	}
	if rec.Filename != "test.txt" {
		t.Errorf("filename = %q", rec.Filename)
	}
	if rec.StorageMode != "external" {
		t.Errorf("mode = %q", rec.StorageMode)
	}
	if rec.Size != 11 {
		t.Errorf("size = %d, want 11", rec.Size)
	}

	// Verify stored.
	got, err := filesSvc.Get(rec.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.Filename != "test.txt" {
		t.Errorf("got filename = %q", got.Filename)
	}
}

func TestCopyIntoVault(t *testing.T) {
	db := openTestDB(t)
	vaultRoot := t.TempDir()
	svc := NewService(db, vaultRoot)

	// Source file.
	srcDir := t.TempDir()
	srcFile := filepath.Join(srcDir, "doc.pdf")
	os.WriteFile(srcFile, []byte("PDF content here"), 0o640)

	rec, err := svc.CopyIntoVault("node-1", srcFile, "my-node")
	if err != nil {
		t.Fatalf("CopyIntoVault: %v", err)
	}
	if rec.SHA256 == "" {
		t.Error("expected sha256")
	}
	if rec.StorageMode != "vault" {
		t.Errorf("mode = %q", rec.StorageMode)
	}

	// Verify file on disk.
	if _, err := os.Stat(filepath.Join(vaultRoot, rec.Path)); err != nil {
		t.Errorf("file on disk: %v", err)
	}
}

func TestListByNode(t *testing.T) {
	db := openTestDB(t)
	svc := NewService(db, t.TempDir())

	os.WriteFile(filepath.Join(t.TempDir(), "a.txt"), []byte("a"), 0o640)
	f1 := filepath.Join(t.TempDir(), "a1.txt")
	f2 := filepath.Join(t.TempDir(), "a2.txt")
	os.WriteFile(f1, []byte("a"), 0o640)
	os.WriteFile(f2, []byte("bb"), 0o640)

	svc.AddExternal("node-a", f1)
	svc.AddExternal("node-a", f2)

	list, err := svc.ListByNode("node-a")
	if err != nil {
		t.Fatal(err)
	}
	if len(list) != 2 {
		t.Errorf("list len = %d, want 2", len(list))
	}
}

func TestDeleteToTrash(t *testing.T) {
	db := openTestDB(t)
	vaultRoot := t.TempDir()
	svc := NewService(db, vaultRoot)

	src := filepath.Join(t.TempDir(), "important.pdf")
	os.WriteFile(src, []byte("important data"), 0o640)

	rec, _ := svc.CopyIntoVault("node-x", src, "node-x")

	if err := svc.DeleteToTrash(rec.ID); err != nil {
		t.Fatalf("DeleteToTrash: %v", err)
	}

	// File record should be gone.
	if _, err := svc.Get(rec.ID); err == nil {
		t.Error("expected error after trash")
	}

	// Original file should not exist anymore (moved to trash).
	if _, err := os.Stat(filepath.Join(vaultRoot, rec.Path)); !os.IsNotExist(err) {
		t.Error("expected file to be moved from original location")
	}

	// Trash dir should have it.
	trashDir := filepath.Join(vaultRoot, ".verstak", "trash")
	entries, _ := os.ReadDir(trashDir)
	if len(entries) != 1 {
		t.Errorf("trash entries = %d, want 1", len(entries))
	}
}

func TestGuessMIME(t *testing.T) {
	cases := map[string]string{
		"a.md":    "text/plain",
		"a.png":   "image/png",
		"a.pdf":   "application/pdf",
		"a.docx":  "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
		"a.go":    "text/plain",
		"a.unknown": "application/octet-stream",
	}
	for name, want := range cases {
		got := guessMIME(name)
		if got != want {
			t.Errorf("guessMIME(%q) = %q, want %q", name, got, want)
		}
	}
}