package toolbox

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

	toolutil "git.mlow.ca/mlow/lmcli/pkg/agent/toolbox/util"
	"git.mlow.ca/mlow/lmcli/pkg/api"
)

const READ_DIR_DESCRIPTION = `Return the contents of the CWD (current working directory).

Example result:
{
	"message": "success",
	"result": [
		{"name": "a_file.txt", "type": "file", "size": 123},
		{"name": "a_directory/", "type": "dir", "size": 11},
		...
	]
}

For files, size represents the size of the file, in bytes.
For directories, size represents the number of entries in that directory.`

var ReadDirTool = api.ToolSpec{
	Name:        "read_dir",
	Description: READ_DIR_DESCRIPTION,
	Parameters: []api.ToolParameter{
		{
			Name:        "relative_dir",
			Type:        "string",
			Description: "If set, read the contents of a directory relative to the current one.",
		},
	},
	Impl: func(tool *api.ToolSpec, args map[string]interface{}) (string, error) {
		var relativeDir string
		tmp, ok := args["relative_dir"]
		if ok {
			relativeDir, ok = tmp.(string)
			if !ok {
				return "", fmt.Errorf("Invalid relative_dir in function arguments: %v", tmp)
			}
		}
		result := readDir(relativeDir)
		ret, err := result.ToJson()
		if err != nil {
			return "", fmt.Errorf("Could not serialize result: %v", err)
		}
		return ret, nil
	},
}

func readDir(path string) api.CallResult {
	if path == "" {
		path = "."
	}
	ok, reason := toolutil.IsPathWithinCWD(path)
	if !ok {
		return api.CallResult{Message: reason}
	}

	files, err := os.ReadDir(path)
	if err != nil {
		return api.CallResult{
			Message: err.Error(),
		}
	}

	var dirContents []map[string]interface{}
	for _, f := range files {
		info, _ := f.Info()

		name := f.Name()
		if strings.HasPrefix(name, ".") {
			// skip hidden files
			continue
		}

		entryType := "file"
		size := info.Size()

		if info.IsDir() {
			name += "/"
			entryType = "dir"
			subdirfiles, _ := os.ReadDir(filepath.Join(".", path, info.Name()))
			size = int64(len(subdirfiles))
		}

		dirContents = append(dirContents, map[string]interface{}{
			"name": name,
			"type": entryType,
			"size": size,
		})
	}

	return api.CallResult{Result: dirContents}
}