package tmpls

import (
	"fmt"
	"github.com/kercylan98/minotaur/planner/pce"
	"strings"
)

// NewGolang 创建一个 Golang 配置导出模板
func NewGolang(packageName string) *Golang {
	return &Golang{
		Package: packageName,
	}
}

// Golang 配置导出模板
type Golang struct {
	Package   string
	Templates []*pce.TmplStruct
}

func (slf *Golang) Render(templates ...*pce.TmplStruct) (string, error) {
	slf.Templates = templates
	return render(`// Code generated by minotaur. DO NOT EDIT.
		package {{.Package}}
		
		import (
			jsonIter "github.com/json-iterator/go"
			"github.com/kercylan98/minotaur/utils/log"
			"sync"
		)

		type Sign string

		const (
			{{- range .Templates}}
				{{.Name}}Sign Sign = "{{.Name}}"
			{{- end}}
		)
		
		var (
			json = jsonIter.ConfigCompatibleWithStandardLibrary
			configs map[Sign]any
			signs = []Sign{
				{{- range .Templates}}	
					{{.Name}}Sign,
				{{- end}}
			}
			mutex sync.Mutex
		)
		
		var (
			{{- range .Templates}}
				{{- if $.HasIndex .}}
					{{.Name}} {{$.GetVariable .}}
				{{- end}}
			{{- end}}
		)

		var (
			{{- range .Templates}}
				{{- if $.HasIndex .}}{{- else}}
					{{.Name}} *{{$.GetConfigName .}}
				{{- end}}
			{{- end}}
		)
		
		var (
			{{- range .Templates}}
				{{- if $.HasIndex .}}
					_{{.Name}} {{$.GetVariable .}}
				{{- end}}
			{{- end}}
		)

		var (
			{{- range .Templates}}
				{{- if $.HasIndex .}}{{- else}}
					_{{.Name}} *{{$.GetConfigName .}}
				{{- end}}
			{{- end}}
		)
		
		{{- range .Templates}}
			type {{$.GetConfigName .}} struct {
				{{- range .Fields}}
					{{- if .IsSlice}}
						{{- if .IsStruct}}
							{{.Name}} []*{{.Struct.Name}} // {{.Desc}}
						{{- else}}
							{{.Name}} []{{.Type}} // {{.Desc}}
						{{- end}}
					{{- else}}
						{{- if .IsStruct}}	
							{{.Name}} *{{.Struct.Name}} // {{.Desc}}	
						{{- else}}	
							{{.Name}} {{.Type}} // {{.Desc}}	
						{{- end}}
					{{- end}}
				{{- end}}
			}

			func (slf *{{$.GetConfigName .}}) String() string {
				if data, err := json.Marshal(slf); err == nil {
					return string(data)
				}
				return "{}"
			}
		{{- end}}

		{{- range .Templates}}
			{{- range .AllChildren}}
				type {{.Name}} struct {
					{{- range .Fields}}
						{{- if .IsSlice}}
							{{- if .IsStruct}}
								{{.Name}} []*{{.Struct.Name}} // {{.Desc}}
							{{- else}}
								{{.Name}} []{{.Type}} // {{.Desc}}
							{{- end}}
						{{- else}}
							{{- if .IsStruct}}	
								{{.Name}} *{{.Struct.Name}} // {{.Desc}}	
							{{- else}}	
								{{.Name}} {{.Type}} // {{.Desc}}	
							{{- end}}
						{{- end}}
					{{- end}}
				}
				
			{{- end}}
		{{- end}}

		// Load 通过自定义的方式加载配置
		//  - 通常建议使用该方法加载配置，因为仅执行一次加解锁
		func LoadWithHandle(handle func(sign Sign, config any, json jsonIter.API) error) {
			mutex.Lock()
			defer mutex.Unlock()
			for _, sign := range signs {
				switch sign {
					{{- range .Templates}}
						case {{.Name}}Sign:
							{{- if $.HasIndex .}}
								temp := make({{$.GetVariable .}})
							{{- else}}
								temp := new({{$.GetConfigName .}})
							{{- end}}
							if err := handle(sign, &temp, json);err != nil {
								log.Error("Config", log.String("Name", "{{.Name}}"), log.Bool("Invalid", true), log.Err(err))
							}else {
								_{{.Name}} = temp
							}
					{{- end}}	
				}
			}
		}

		// LoadIndexConfig 通过 JSON 加载配置
		func LoadWithJSON(sign Sign, data []byte) {
			switch sign {
				{{- range .Templates}}
					case {{.Name}}Sign:
						{{- if $.HasIndex .}}
							temp := make({{$.GetVariable .}})
						{{- else}}
							temp := new({{$.GetConfigName .}})
						{{- end}}
						if err := json.Unmarshal(data, &{{.Name}}); err != nil {
							log.Error("Config", log.String("Name", "{{.Name}}"), log.Bool("Invalid", true), log.Err(err))
							return
						}
						_{{.Name}} = temp
				{{- end}}
			}
		}

		// Refresh 将加载后的配置刷新到线上
		func Refresh() {
			mutex.Lock()
			defer mutex.Unlock()
			cs := make(map[Sign]any)

			{{- range .Templates}}
				{{.Name}} = _{{.Name}}
				cs[{{.Name}}Sign] = {{.Name}}
			{{- end}}

			configs = cs
		}

		// GetConfigs 获取所有配置
		func GetConfigs() map[Sign]any {
			return configs
		}

		// GetConfigSigns 获取所有配置的标识
		func GetConfigSigns() []Sign {
			return signs
		}
	`, slf)
}

func (slf *Golang) GetVariable(config *pce.TmplStruct) string {
	var prefix string
	for _, field := range config.Fields {
		if field.IsIndex() {
			prefix += fmt.Sprintf("map[%s]", field.Type)
		}
	}
	return fmt.Sprintf("%s*%s", prefix, slf.GetConfigName(config))
}

func (slf *Golang) GetConfigName(config *pce.TmplStruct) string {
	return strings.ReplaceAll(config.Name, "Config", "Configuration")
}

func (slf *Golang) HasIndex(config *pce.TmplStruct) bool {
	return config.IndexCount > 0
}