package web

import (
	"net/http"
	"sync/atomic"

	"git.loafle.net/overflow/server-go"
	"git.loafle.net/overflow/server-go/socket"

	"github.com/valyala/fasthttp"
)

type ServerHandler interface {
	socket.ServerHandler

	OnError(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx, status int, reason error)

	RegisterServlet(path string, servlet Servlet)
	Servlet(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx) Servlet

	CheckOrigin(ctx *fasthttp.RequestCtx) bool
}

type ServerHandlers struct {
	socket.ServerHandlers

	servlets map[string]Servlet

	validated atomic.Value
}

func (sh *ServerHandlers) Init(serverCtx server.ServerCtx) error {
	if err := sh.ServerHandlers.Init(serverCtx); nil != err {
		return err
	}

	if nil != sh.servlets {
		for _, servlet := range sh.servlets {
			if err := servlet.Init(serverCtx); nil != err {
				return err
			}
		}
	}

	return nil
}

func (sh *ServerHandlers) OnStart(serverCtx server.ServerCtx) error {
	if err := sh.ServerHandlers.OnStart(serverCtx); nil != err {
		return err
	}

	if nil != sh.servlets {
		for _, servlet := range sh.servlets {
			if err := servlet.OnStart(serverCtx); nil != err {
				return err
			}
		}
	}

	return nil
}

func (sh *ServerHandlers) OnStop(serverCtx server.ServerCtx) {
	if nil != sh.servlets {
		for _, servlet := range sh.servlets {
			servlet.OnStop(serverCtx)
		}
	}

	sh.ServerHandlers.OnStop(serverCtx)
}

func (sh *ServerHandlers) Destroy(serverCtx server.ServerCtx) {
	if nil != sh.servlets {
		for _, servlet := range sh.servlets {
			servlet.Destroy(serverCtx)
		}
	}

	sh.ServerHandlers.Destroy(serverCtx)
}

func (sh *ServerHandlers) OnError(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx, status int, reason error) {
	ctx.Response.Header.Set("Sec-Websocket-Version", "13")
	ctx.Error(http.StatusText(status), status)
}

func (sh *ServerHandlers) RegisterServlet(path string, servlet Servlet) {
	if nil == sh.servlets {
		sh.servlets = make(map[string]Servlet)
	}
	sh.servlets[path] = servlet
}

func (sh *ServerHandlers) Servlet(serverCtx server.ServerCtx, ctx *fasthttp.RequestCtx) Servlet {
	path := string(ctx.Path())

	var servlet Servlet
	if path == "" && len(sh.servlets) == 1 {
		for _, s := range sh.servlets {
			servlet = s
		}
	} else if servlet = sh.servlets[path]; nil == servlet {
		return nil
	}

	return servlet
}

func (sh *ServerHandlers) CheckOrigin(ctx *fasthttp.RequestCtx) bool {
	return true
}

func (sh *ServerHandlers) Validate() error {
	if nil != sh.validated.Load() {
		return nil
	}
	sh.validated.Store(true)

	if err := sh.ServerHandlers.Validate(); nil != err {
		return err
	}

	return nil
}