package notes

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

	"verstak/internal/core/files"
	"verstak/internal/core/nodes"
	"verstak/internal/core/storage"
)

func setupRenameService(t *testing.T) (*Service, *nodes.Repository, string) {
	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() })
	nodeRepo := nodes.NewRepository(db)
	fileSvc := files.NewService(db, dir, nodeRepo)
	svc := NewService(db, dir, nodeRepo, fileSvc)
	return svc, nodeRepo, dir
}

func TestRenameNote(t *testing.T) {
	svc, nodeRepo, _ := setupRenameService(t)

	node, _, err := svc.Create("", "Original Title", "")
	if err != nil {
		t.Fatalf("Create: %v", err)
	}

	// Rename
	err = svc.Rename(node.ID, "New Title")
	if err != nil {
		t.Fatalf("Rename: %v", err)
	}

	// Verify node title updated
	updated, err := nodeRepo.GetActive(node.ID)
	if err != nil {
		t.Fatalf("GetActive: %v", err)
	}
	if updated.Title != "New Title" {
		t.Errorf("title = %q, want %q", updated.Title, "New Title")
	}

	// Verify slug updated
	if !strings.Contains(updated.Slug, "new") {
		t.Errorf("slug = %q, want containing 'new'", updated.Slug)
	}
}

func TestRenameNoteRenamesFile(t *testing.T) {
	svc, nodeRepo, vaultRoot := setupRenameService(t)

	node, _, err := svc.Create("", "Original Title", "")
	if err != nil {
		t.Fatalf("Create: %v", err)
	}

	// Write content.
	content := "# Original Title\n\nSome content."
	if err := svc.Save(node.ID, content); err != nil {
		t.Fatalf("Save: %v", err)
	}

	// Rename should rename the file on disk.
	if err := svc.Rename(node.ID, "Renamed Title"); err != nil {
		t.Fatalf("Rename: %v", err)
	}

	// Verify node title updated.
	updated, err := nodeRepo.GetActive(node.ID)
	if err != nil {
		t.Fatalf("GetActive: %v", err)
	}
	if updated.Title != "Renamed Title" {
		t.Errorf("title = %q, want %q", updated.Title, "Renamed Title")
	}

	// Verify old file no longer exists.
	oldPath := filepath.Join(vaultRoot, "Notes", "Original Title.md")
	if _, err := os.Stat(oldPath); !os.IsNotExist(err) {
		t.Error("old file should not exist after rename")
	}

	// Verify new file exists with correct content.
	newPath := filepath.Join(vaultRoot, "Notes", "Renamed Title.md")
	data, err := os.ReadFile(newPath)
	if err != nil {
		t.Fatalf("ReadFile: %v", err)
	}
	if string(data) != content {
		t.Errorf("content = %q, want %q", string(data), content)
	}
}

func TestRenameNoteCollisionRejected(t *testing.T) {
	svc, _, _ := setupRenameService(t)

	// Create two notes.
	node1, _, err := svc.Create("", "Note Alpha", "")
	if err != nil {
		t.Fatalf("Create note1: %v", err)
	}
	_, _, err = svc.Create("", "Note Beta", "")
	if err != nil {
		t.Fatalf("Create note2: %v", err)
	}

	// Renaming note1 to "Note Beta" should fail — file already exists.
	err = svc.Rename(node1.ID, "Note Beta")
	if err == nil {
		t.Error("expected error for rename collision, got nil")
	}
	if !strings.Contains(err.Error(), "already exists") {
		t.Errorf("expected 'already exists' error, got: %v", err)
	}
}

func TestRenameNoteEmptyTitle(t *testing.T) {
	svc, _, _ := setupRenameService(t)

	node, _, err := svc.Create("", "Valid Title", "")
	if err != nil {
		t.Fatalf("Create: %v", err)
	}

	// Try to rename with empty title — should fail
	err = svc.Rename(node.ID, "")
	if err == nil {
		t.Error("expected error for empty title")
	}
}

func TestDeleteNoteSoftDeletesNode(t *testing.T) {
	svc, nodeRepo, _ := setupRenameService(t)

	node, _, err := svc.Create("", "To Delete", "")
	if err != nil {
		t.Fatalf("Create: %v", err)
	}

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

	// Verify node is soft-deleted
	_, err = nodeRepo.GetActive(node.ID)
	if err == nil {
		t.Error("expected deleted node to be inactive")
	}
}

func TestDeleteNoteDoesNotAffectOtherNotes(t *testing.T) {
	svc, _, vaultRoot := setupRenameService(t)

	// Create two notes
	node1, _, err := svc.Create("", "Note One", "")
	if err != nil {
		t.Fatalf("Create note1: %v", err)
	}
	node2, _, err := svc.Create("", "Note Two", "")
	if err != nil {
		t.Fatalf("Create note2: %v", err)
	}

	// Save content to both
	svc.Save(node1.ID, "content one")
	svc.Save(node2.ID, "content two")

	// Delete note1
	if err := svc.Delete(node1.ID); err != nil {
		t.Fatalf("Delete: %v", err)
	}

	// Verify note2 content is still readable
	content, err := svc.Read(node2.ID)
	if err != nil {
		t.Fatalf("Read note2: %v", err)
	}
	if content != "content two" {
		t.Errorf("note2 content = %q, want %q", content, "content two")
	}

	_ = vaultRoot
}

func TestPathTraversalBlocked(t *testing.T) {
	svc, _, vaultRoot := setupRenameService(t)

	// Try to create a note with path traversal in title
	node, _, err := svc.Create("", "../../../etc/passwd", "")
	if err != nil {
		t.Fatalf("Create: %v", err)
	}

	// Verify the file was created with sanitized name, not traversing
	content, err := svc.Read(node.ID)
	if err != nil {
		t.Fatalf("Read: %v", err)
	}
	_ = content

	// Check that no file exists outside vault
	suspicious := filepath.Join(vaultRoot, "..", "..", "..", "etc", "passwd.md")
	if _, err := os.Stat(suspicious); err == nil {
		t.Error("path traversal succeeded — file created outside vault")
	}
}

func TestDeleteNoteMovesFileToSharedTrash(t *testing.T) {
	svc, _, vaultRoot := setupRenameService(t)

	node, _, err := svc.Create("", "To Delete", "")
	if err != nil {
		t.Fatalf("Create: %v", err)
	}

	// Write content
	content := "# To Delete\n\nThis content should survive deletion."
	if err := svc.Save(node.ID, content); err != nil {
		t.Fatalf("Save: %v", err)
	}

	// Get the file record to know the trash file name.
	rec, err := svc.Load(node.ID)
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	fileRec, err := svc.files.Get(rec.FileID)
	if err != nil {
		t.Fatalf("Get file: %v", err)
	}

	// Delete (soft-delete + move to shared trash)
	if err := svc.Delete(node.ID); err != nil {
		t.Fatalf("Delete: %v", err)
	}

	// Verify original file no longer exists at original location
	origPath := filepath.Join(vaultRoot, "Notes", "To Delete.md")
	if _, err := os.Stat(origPath); !os.IsNotExist(err) {
		t.Error("original file should not exist at original location after delete")
	}

	// Verify file exists in shared trash (not in trash/notes/)
	trashDir := filepath.Join(vaultRoot, ".verstak", "trash")
	trashFile := filepath.Join(trashDir, fileRec.ID+"_"+fileRec.Filename)
	data, err := os.ReadFile(trashFile)
	if err != nil {
		t.Fatalf("ReadFile trash: %v", err)
	}
	if string(data) != content {
		t.Errorf("trash content = %q, want %q", string(data), content)
	}

	// Verify file record is marked missing=1
	updatedRec, err := svc.files.Get(rec.FileID)
	if err != nil {
		t.Fatalf("Get file after delete: %v", err)
	}
	if !updatedRec.Missing {
		t.Error("file record should be marked missing=1 after delete")
	}
}

func TestDeleteNoteNoActiveNodeForOrphan(t *testing.T) {
	svc, nodeRepo, vaultRoot := setupRenameService(t)

	node, _, err := svc.Create("", "Orphan Test", "")
	if err != nil {
		t.Fatalf("Create: %v", err)
	}

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

	// Node should not be active
	_, err = nodeRepo.GetActive(node.ID)
	if err == nil {
		t.Error("deleted node should not be returned by GetActive")
	}

	// File should be in shared trash, not in Notes/
	notesPath := filepath.Join(vaultRoot, "Notes", "Orphan Test.md")
	if _, err := os.Stat(notesPath); !os.IsNotExist(err) {
		t.Error("file should not remain in Notes/ after delete")
	}

	// Verify file is in shared trash (not trash/notes/)
	trashDir := filepath.Join(vaultRoot, ".verstak", "trash")
	entries, _ := os.ReadDir(trashDir)
	found := false
	for _, e := range entries {
		if e.Name() != "" {
			found = true
			break
		}
	}
	if !found {
		t.Error("file should exist in shared trash/")
	}
}