// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.

package config

import (
	"context"
	"encoding/json"
	"net/url"
	"fmt"
	"decl/internal/data"
	"decl/internal/folio"
	"runtime"
	"decl/internal/system"
)

// Collects facts about the system

var (
	buildValues = map[string]any{
		"GOOS": runtime.GOOS,
		"GOARCH": runtime.GOARCH,
	}
)

func init() {
	folio.DocumentRegistry.ConfigurationTypes.Register([]string{"system"}, func(u *url.URL) data.Configuration {
		s := NewSystem()
		return s
	})
}

type System Generic[any]

func NewSystem() *System {
	s := make(System)
	for k, v := range buildValues {
		s[k] = v
	}
	s.CurrentUser()
	s["importpath"] = []string {
		"/etc/jx/lib",
	}
	return &s
}

func (s *System) CurrentUser() {
	processUser := system.ProcessUser()
	processGroup := system.ProcessGroup(processUser)
	(*s)["user"] = processUser.Username
	(*s)["gecos"] = processUser.Name
	(*s)["home"] = processUser.HomeDir
	(*s)["uid"] = processUser.Uid
	(*s)["group"] = processGroup.Name
	(*s)["gid"] = processUser.Gid
}

func (s *System) URI() string {
	return fmt.Sprintf("%s://%s", s.Type(), "")
}

func (s *System) SetURI(uri string) error {
        return nil
}

func (s *System) SetParsedURI(uri data.URIParser) error {
        return nil
}

func (s *System) Clone() data.Configuration {
	jsonSystem, _ := json.Marshal(s)
	clone := NewSystem()
	if unmarshalErr := json.Unmarshal(jsonSystem, clone); unmarshalErr != nil {
		panic(unmarshalErr)
	}
	return clone
}

func (s *System) Has(key string) (ok bool) {
	_, ok = (*s)[key]
	return
}

func (s *System) Type() string {
	return "system"
}

func (s *System) Read(context.Context) ([]byte, error) {
	return nil, nil
}

func (s *System) GetValue(name string) (result any, err error) {
	var ok bool
	if result, ok = (*s)[name]; !ok {
		err = data.ErrUnknownConfigurationKey
	}
	return
}