package api

import (
	"context"
	"git.sxidc.com/go-tools/utils/strutils"
	"git.sxidc.com/service-supports/fserr"
	"github.com/gin-gonic/gin"
	"net/http"
)

type Api struct {
	options Options

	server       *http.Server
	rootRouter   *RootRouter
	prefixRouter *PrefixRouter
}

func New(opts ...Option) *Api {
	options := new(Options)

	for _, opt := range opts {
		opt(options)
	}

	if strutils.IsStringEmpty(options.port) {
		options.port = "8080"
	}

	engine := gin.New()

	server := &http.Server{
		Addr:    ":" + options.port,
		Handler: engine,
	}

	api := &Api{
		options:    *options,
		server:     server,
		rootRouter: newRootRouter(engine),
	}

	if strutils.IsStringNotEmpty(options.urlPrefix) {
		api.prefixRouter = newPrefixRouter(engine.Group(options.urlPrefix))
	}

	return api
}

func NewWithEngine(server *http.Server, engine *gin.Engine, opts ...Option) *Api {
	options := new(Options)

	for _, opt := range opts {
		opt(options)
	}

	if strutils.IsStringEmpty(options.port) {
		options.port = "8080"
	}

	api := &Api{
		options:    *options,
		server:     server,
		rootRouter: newRootRouter(engine),
	}

	if strutils.IsStringNotEmpty(options.urlPrefix) {
		api.prefixRouter = newPrefixRouter(engine.Group(options.urlPrefix))
	}

	return api
}

func (api *Api) Start() error {
	err := api.server.ListenAndServe()
	if err != nil && !fserr.Is(err, http.ErrServerClosed) {
		return fserr.New(err.Error())
	}

	return nil
}

func (api *Api) Finish() error {
	err := api.server.Shutdown(context.Background())
	if err != nil {
		return fserr.New(err.Error())
	}

	return nil
}

func (api *Api) Options() Options {
	return api.options
}

func (api *Api) RootRouter() Router {
	return api.rootRouter
}

func (api *Api) PrefixRouter() Router {
	if api.prefixRouter == nil {
		return api.rootRouter
	}

	return api.prefixRouter
}

const (
	RouterRoot   = "root"
	RouterPrefix = "prefix"
)

func (api *Api) ChooseRouter(routerType string, version string) Router {
	var router Router

	switch routerType {
	case RouterRoot:
		router = api.RootRouter()
	case RouterPrefix:
		router = api.PrefixRouter()
	default:
		router = api.PrefixRouter()
	}

	if strutils.IsStringNotEmpty(version) {
		router = router.VersionedRouter(version)
	}

	return router
}