package main

import (
	"context"
	"net/http"
	"time"

	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
	httputil "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/http"
	"go.uber.org/zap"
)

type httpComponent struct {
	srv         *httputil.Server
	address     string
	name        string
	handler     http.Handler
	shutdownDur time.Duration
	enabled     bool
}

const (
	enabledKeyPostfix         = ".enabled"
	addressKeyPostfix         = ".address"
	shutdownTimeoutKeyPostfix = ".shutdown_timeout"
)

func (c *httpComponent) init() {
	log.Info(context.Background(), "init "+c.name)
	c.enabled = cfg.GetBool(c.name + enabledKeyPostfix)
	c.address = cfg.GetString(c.name + addressKeyPostfix)
	c.shutdownDur = cfg.GetDuration(c.name + shutdownTimeoutKeyPostfix)

	if c.enabled {
		c.srv = httputil.New(
			httputil.HTTPSrvPrm{
				Address: c.address,
				Handler: c.handler,
			},
			httputil.WithShutdownTimeout(c.shutdownDur),
		)
	} else {
		log.Info(context.Background(), c.name+" is disabled, skip")
		c.srv = nil
	}
}

func (c *httpComponent) start() {
	if c.srv != nil {
		log.Info(context.Background(), "start "+c.name)
		wg.Add(1)
		go func() {
			defer wg.Done()
			exitErr(c.srv.Serve())
		}()
	}
}

func (c *httpComponent) shutdown() error {
	if c.srv != nil {
		log.Info(context.Background(), "shutdown "+c.name)
		return c.srv.Shutdown()
	}
	return nil
}

func (c *httpComponent) needReload() bool {
	enabled := cfg.GetBool(c.name + enabledKeyPostfix)
	address := cfg.GetString(c.name + addressKeyPostfix)
	dur := cfg.GetDuration(c.name + shutdownTimeoutKeyPostfix)
	return enabled != c.enabled || enabled && (address != c.address || dur != c.shutdownDur)
}

func (c *httpComponent) reload() {
	log.Info(context.Background(), "reload "+c.name)
	if c.needReload() {
		log.Info(context.Background(), c.name+" config updated")
		if err := c.shutdown(); err != nil {
			log.Debug(context.Background(), logs.FrostFSIRCouldNotShutdownHTTPServer,
				zap.String("error", err.Error()),
			)
		} else {
			c.init()
			c.start()
		}
	}
}