package cmd

import (
	"errors"
	"fmt"
	"io/fs"
	"os"
	"path/filepath"
	"strings"
	"text/template"

	"go.ipao.vip/atomctl/templates"
	"github.com/iancoleman/strcase"
	"github.com/spf13/cobra"
)

// CommandNewProvider 注册 new_provider 命令
func CommandNewProvider(root *cobra.Command) {
	cmd := &cobra.Command{
		Use:   "provider",
		Short: "创建新的 provider",
		Args:  cobra.ExactArgs(1),
		RunE:  commandNewProviderE,
	}

	root.AddCommand(cmd)
}

func commandNewProviderE(cmd *cobra.Command, args []string) error {
    providerName := args[0]
    // shared flags
    dryRun, _ := cmd.Flags().GetBool("dry-run")
    baseDir, _ := cmd.Flags().GetString("dir")

    targetPath := filepath.Join(baseDir, "providers", providerName)

    if _, err := os.Stat(targetPath); err == nil {
        return fmt.Errorf("目录 %s 已存在", targetPath)
    }

    if dryRun {
        fmt.Printf("[dry-run] mkdir -p %s\n", targetPath)
    } else {
        if err := os.MkdirAll(targetPath, os.ModePerm); err != nil {
            return err
        }
    }

	err := fs.WalkDir(templates.Provider, "provider", func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() {
			return nil
		}

		relPath, err := filepath.Rel("provider", path)
		if err != nil {
			return err
		}

        destPath := filepath.Join(targetPath, strings.TrimSuffix(relPath, ".tpl"))
        if dryRun {
            fmt.Printf("[dry-run] mkdir -p %s\n", filepath.Dir(destPath))
        } else {
            if err := os.MkdirAll(filepath.Dir(destPath), os.ModePerm); err != nil {
                return err
            }
        }

		tmpl, err := template.ParseFS(templates.Provider, path)
		if err != nil {
			return err
		}

        if dryRun {
            fmt.Printf("[dry-run] render > %s\n", destPath)
            return nil
        }

        destFile, err := os.Create(destPath)
        if err != nil {
            return err
        }
        defer destFile.Close()

        return tmpl.Execute(destFile, map[string]string{
            "Name":      providerName,
            "CamelName": strcase.ToCamel(providerName),
        })
	})
	if err != nil {
		return errors.New("渲染 provider 模板失败")
	}

	fmt.Printf("Provider 已创建: %s\n", targetPath)
	return nil
}