// Path: Backend/internal/bootstrap/project_disk_items.go

package bootstrap

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

	"github.com/google/uuid"
)

func (service *Service) createProjectTreeItemOnDisk(projectSlug, parentFolderPath, name, itemType string) (string, error) {
	posixRoot := strings.TrimSpace(service.posixRoot)
	if posixRoot == "" {
		return "", fmt.Errorf("POSIX root is not configured")
	}
	trimmedName := strings.TrimSpace(name)
	if trimmedName == "" {
		return "", fmt.Errorf("item name is required")
	}
	canonicalItemType := normalizeProjectTreeItemType(itemType)
	containerProjectionPath := projectTreeRootPath(projectSlug)
	parentDir := filepath.Join(posixRoot, filepath.FromSlash(containerProjectionPath))
	if trimmedParentFolderPath := strings.TrimSpace(parentFolderPath); trimmedParentFolderPath != "" {
		containerProjectionPath = trimmedParentFolderPath
		parentDir = filepath.Join(posixRoot, filepath.FromSlash(containerProjectionPath))
		info, err := os.Stat(parentDir)
		if err != nil {
			if os.IsNotExist(err) {
				return "", ErrProjectFolderNotFound
			}
			return "", fmt.Errorf("stat parent project folder: %w", err)
		}
		if !info.IsDir() {
			return "", ErrProjectFolderNotFound
		}
	}
	if err := os.MkdirAll(parentDir, 0o755); err != nil {
		return "", fmt.Errorf("create parent project item path: %w", err)
	}
	baseSlug := normalizePOSIXSlug(trimmedName)
	itemDirName := slugDir("item", baseSlug)
	itemDir := filepath.Join(parentDir, itemDirName)
	itemSlug := baseSlug
	for attempt := 2; ; attempt += 1 {
		if _, err := os.Stat(itemDir); os.IsNotExist(err) {
			break
		} else if err != nil {
			return "", fmt.Errorf("stat candidate project item: %w", err)
		}
		itemSlug = fmt.Sprintf("%s-%d", baseSlug, attempt)
		itemDirName = slugDir("item", itemSlug)
		itemDir = filepath.Join(parentDir, itemDirName)
	}
	if err := os.MkdirAll(itemDir, 0o755); err != nil {
		return "", fmt.Errorf("create project item: %w", err)
	}
	itemID := uuid.NewString()
	if err := writeCBORFile(filepath.Join(itemDir, posixItemFileName), map[string]any{"id": itemID, "name": trimmedName, "slug": itemSlug, "type": canonicalItemType}); err != nil {
		return "", fmt.Errorf("write project %s: %w", posixItemFileName, err)
	}
	if err := writeJSONFile(filepath.Join(itemDir, posixSchemaFileName), defaultProjectTreeItemSchema(canonicalItemType)); err != nil {
		return "", fmt.Errorf("write project %s: %w", posixSchemaFileName, err)
	}
	if err := writeCBORFile(filepath.Join(itemDir, posixDataFileName), defaultProjectTreeItemData(canonicalItemType, trimmedName)); err != nil {
		return "", fmt.Errorf("write project %s: %w", posixDataFileName, err)
	}
	return filepath.ToSlash(filepath.Join(containerProjectionPath, itemDirName)), nil
}

func (service *Service) deleteProjectTreeItemOnDisk(projectSlug, itemPath string) (string, error) {
	posixRoot := strings.TrimSpace(service.posixRoot)
	if posixRoot == "" {
		return "", fmt.Errorf("POSIX root is not configured")
	}
	rootProjectionPath := projectTreeRootPath(projectSlug)
	itemProjectionPath := strings.TrimPrefix(filepath.ToSlash(filepath.Clean("/"+strings.TrimSpace(itemPath))), "/")
	if itemProjectionPath == "." || itemProjectionPath == rootProjectionPath || !strings.HasPrefix(itemProjectionPath, rootProjectionPath+"/") {
		return "", ErrProjectItemNotFound
	}
	itemDir := filepath.Join(posixRoot, filepath.FromSlash(itemProjectionPath))
	info, err := os.Stat(itemDir)
	if err != nil {
		if os.IsNotExist(err) {
			return "", ErrProjectItemNotFound
		}
		return "", fmt.Errorf("stat project item: %w", err)
	}
	if !info.IsDir() {
		return "", ErrProjectItemNotFound
	}
	if err := os.RemoveAll(itemDir); err != nil {
		return "", fmt.Errorf("delete project item: %w", err)
	}
	return itemProjectionPath, nil
}

func (service *Service) moveProjectTreeItemOnDisk(projectSlug, itemPath, parentFolderPath string) (string, string, error) {
	posixRoot := strings.TrimSpace(service.posixRoot)
	if posixRoot == "" {
		return "", "", fmt.Errorf("POSIX root is not configured")
	}
	rootProjectionPath := projectTreeRootPath(projectSlug)
	itemProjectionPath := strings.TrimPrefix(filepath.ToSlash(filepath.Clean("/"+strings.TrimSpace(itemPath))), "/")
	if itemProjectionPath == "." || itemProjectionPath == rootProjectionPath || !strings.HasPrefix(itemProjectionPath, rootProjectionPath+"/") {
		return "", "", ErrProjectItemNotFound
	}
	itemDir := filepath.Join(posixRoot, filepath.FromSlash(itemProjectionPath))
	info, err := os.Stat(itemDir)
	if err != nil {
		if os.IsNotExist(err) {
			return "", "", ErrProjectItemNotFound
		}
		return "", "", fmt.Errorf("stat project item: %w", err)
	}
	if !info.IsDir() {
		return "", "", ErrProjectItemNotFound
	}
	trimmedParentFolderPath := strings.TrimSpace(parentFolderPath)
	parentProjectionPath := rootProjectionPath
	parentDir := filepath.Join(posixRoot, filepath.FromSlash(parentProjectionPath))
	if trimmedParentFolderPath != "" {
		parentProjectionPath = strings.TrimPrefix(filepath.ToSlash(filepath.Clean("/"+trimmedParentFolderPath)), "/")
		if parentProjectionPath == "." || parentProjectionPath == rootProjectionPath || !strings.HasPrefix(parentProjectionPath, rootProjectionPath+"/") {
			return "", "", ErrProjectFolderNotFound
		}
		parentDir = filepath.Join(posixRoot, filepath.FromSlash(parentProjectionPath))
	}
	parentInfo, err := os.Stat(parentDir)
	if err != nil {
		if os.IsNotExist(err) {
			return "", "", ErrProjectFolderNotFound
		}
		return "", "", fmt.Errorf("stat project item parent: %w", err)
	}
	if !parentInfo.IsDir() {
		return "", "", ErrProjectFolderNotFound
	}
	currentParentDir := filepath.Dir(itemDir)
	currentBase := filepath.Base(itemDir)
	itemPayload := readStructuredFileMap(filepath.Join(itemDir, posixItemFileName))
	itemID, _ := itemPayload["id"].(string)
	if strings.TrimSpace(itemID) == "" {
		itemID = uuid.NewString()
	}
	itemName, _ := itemPayload["name"].(string)
	if strings.TrimSpace(itemName) == "" {
		itemName = fallbackItemLabel(itemProjectionPath)
	}
	itemType, _ := itemPayload["type"].(string)
	canonicalItemType := normalizeProjectTreeItemType(itemType)
	baseSlug := strings.TrimPrefix(currentBase, "item-")
	if strings.TrimSpace(baseSlug) == "" {
		baseSlug = normalizePOSIXSlug(itemName)
	}
	itemSlug := baseSlug
	itemDirName := slugDir("item", itemSlug)
	destinationDir := filepath.Join(parentDir, itemDirName)
	for attempt := 2; ; attempt += 1 {
		if samePath(destinationDir, itemDir) {
			break
		}
		if _, err := os.Stat(destinationDir); os.IsNotExist(err) {
			break
		} else if err != nil {
			return "", "", fmt.Errorf("stat candidate moved project item: %w", err)
		}
		itemSlug = fmt.Sprintf("%s-%d", baseSlug, attempt)
		itemDirName = slugDir("item", itemSlug)
		destinationDir = filepath.Join(parentDir, itemDirName)
	}
	movedProjectionPath := filepath.ToSlash(filepath.Join(parentProjectionPath, itemDirName))
	if samePath(currentParentDir, parentDir) && currentBase == itemDirName {
		return itemProjectionPath, itemProjectionPath, nil
	}
	if err := os.Rename(itemDir, destinationDir); err != nil {
		return "", "", fmt.Errorf("move project item: %w", err)
	}
	itemPayload["id"] = itemID
	itemPayload["name"] = itemName
	itemPayload["slug"] = itemSlug
	itemPayload["type"] = canonicalItemType
	if err := writeCBORFile(filepath.Join(destinationDir, posixItemFileName), itemPayload); err != nil {
		return "", "", fmt.Errorf("write moved project %s: %w", posixItemFileName, err)
	}
	return itemProjectionPath, movedProjectionPath, nil
}