package uci

import (
	"strings"
)

type UCI struct {
	Packages []*Package `parser:"@@*" json:"packages"`
}

type Package struct {
	Name    string    `parser:"'package' @Ident" json:"name"`
	Configs []*Config `parser:"@@*" json:"configs"`
}

type Config struct {
	Name    string   `parser:"'config' @Ident" json:"name"`
	Section *string  `parser:"@String?" json:"section,omitempty"`
	Options []Option `parser:"@@*" json:"options"`
}

type Option struct {
	Type  string `parser:"@( 'list' | 'option' )" json:"type"`
	Name  string `parser:"@Ident" json:"name"`
	Value string `parser:"@String" json:"value"`
}

func (u *UCI) Export() string {
	var sb strings.Builder

	for pkgIdx, pkg := range u.Packages {
		if pkgIdx > 0 {
			sb.WriteString("\n")
		}

		sb.WriteString("package ")
		sb.WriteString(pkg.Name)
		sb.WriteString("\n")

		for _, cfg := range pkg.Configs {
			sb.WriteString("\n")

			sb.WriteString("config ")
			sb.WriteString(cfg.Name)

			if cfg.Section != nil {
				sb.WriteString(" '")
				sb.WriteString(*cfg.Section)
				sb.WriteString("'")
			}

			for _, opt := range cfg.Options {
				sb.WriteString("\n")

				sb.WriteString("\t")
				sb.WriteString(opt.Type)
				sb.WriteString(" ")
				sb.WriteString(opt.Name)
				sb.WriteString(" '")
				sb.WriteString(opt.Value)
				sb.WriteString("'")
			}

			sb.WriteString("\n")
		}
	}

	return sb.String()
}

func NewUCI() *UCI {
	return &UCI{
		Packages: make([]*Package, 0),
	}
}