package server

import (
	"net/http"
	"strings"

	lib "git.sr.ht/~cco/go-scopes"
	"git.sr.ht/~cco/go-scopes/core"
	"git.sr.ht/~cco/go-scopes/core/message"
	"git.sr.ht/~cco/go-scopes/logging"
	"github.com/gin-gonic/gin"
)

type Data = map[string]interface{}

type ServerState struct {
	server *http.Server
}

func Start(ctx lib.Context) {
	gin.SetMode(gin.ReleaseMode)
	lib.GetCfg[*Cfg](ctx).BaseCfg.WithDoneHandler(HandleDone)
	Serve(ctx)
	lib.RunCtx(ctx, core.Listen)
}

func HandleDone(ctx lib.Context) bool {
	lib.GetState[*ServerState](ctx).server.Shutdown(ctx)
	return false
}

func Serve(ctx lib.Context) {
	r := gin.New()
	r.Use(gin.Recovery())
	r.Use(Logger(ctx))
	cfg := ctx.Config().(*Cfg)
	if cfg.Addr == "" {
		if cfg.Port == "" {
			cfg.Port = "8123"
		}
		cfg.Addr = ":" + cfg.Port
	}
	for _, rcfg := range cfg.routes {
		setRoute(ctx, rcfg, r)
	}
	srv := &http.Server{Addr: cfg.Addr, Handler: r}
	ctx.WithState(&ServerState{server: srv})
	logging.Debug(ctx).Str("addr", cfg.Addr).Msg("server.Serve")
	lib.RunCtx(ctx, func(ctx lib.Context) {
		srv.ListenAndServe()
	})
}

func setRoute(ctx lib.Context, rcfg routeCfg, r *gin.Engine) {
	switch spec := rcfg.spec.(type) {
	case *fsSpec:
		r.Static(rcfg.path, spec.docRoot)
	case *mhSpec:
		r.Match(rcfg.methods, rcfg.path+"/*msg", func(c *gin.Context) {
			handleMsg(ctx, spec, c)
		})
	}
}

// scopes standard request (= message) handler implementation

func handleMsg(ctx lib.Context, cfg *mhSpec, gc *gin.Context) {
	head := strings.Split(gc.Param("msg"), "/")[1:]
	cctx := ctx.ChildContext(cfg)
	msg := message.New(head...).WithSender(cctx)
	// if gc.Request.Method == "POST" && data != "": msg.WithPayload(data)
	core.HandleMessage(cctx, msg)
	code, data := cfg.proc(cctx, msg)
	gc.JSON(code, data)
}

func Async(ctx lib.Context, msg lib.Message) (int, Data) {
	return http.StatusOK, Data{"status": "OK"}
}