package server

import (
	"fmt"
	"net"
	"time"
)

type ServerHandler interface {
	GetName() string
	GetConcurrency() int
	GetHandshakeTimeout() time.Duration
	GetMaxMessageSize() int64
	GetReadBufferSize() int
	GetWriteBufferSize() int
	GetReadTimeout() time.Duration
	GetWriteTimeout() time.Duration
	GetPongTimeout() time.Duration
	GetPingTimeout() time.Duration
	GetPingPeriod() time.Duration

	IsEnableCompression() bool

	ServerCtx() ServerCtx

	Init(serverCtx ServerCtx) error
	OnStart(serverCtx ServerCtx) error
	OnStop(serverCtx ServerCtx)
	Destroy(serverCtx ServerCtx)

	Listener(serverCtx ServerCtx) (net.Listener, error)

	Validate() error
}

type ServerHandlers struct {
	ServerHandler

	// Server name for sending in response headers.
	//
	// Default server name is used if left blank.
	Name string

	// The maximum number of concurrent connections the server may serve.
	//
	// DefaultConcurrency is used if not set.
	Concurrency int

	HandshakeTimeout time.Duration

	MaxMessageSize int64
	// Per-connection buffer size for requests' reading.
	// This also limits the maximum header size.
	//
	// Increase this buffer if your clients send multi-KB RequestURIs
	// and/or multi-KB headers (for example, BIG cookies).
	//
	// Default buffer size is used if not set.
	ReadBufferSize int
	// Per-connection buffer size for responses' writing.
	//
	// Default buffer size is used if not set.
	WriteBufferSize int
	// Maximum duration for reading the full request (including body).
	//
	// This also limits the maximum duration for idle keep-alive
	// connections.
	//
	// By default request read timeout is unlimited.
	ReadTimeout time.Duration

	// Maximum duration for writing the full response (including body).
	//
	// By default response write timeout is unlimited.
	WriteTimeout time.Duration

	PongTimeout time.Duration
	PingTimeout time.Duration
	PingPeriod  time.Duration

	EnableCompression bool
}

func (sh *ServerHandlers) ServerCtx() ServerCtx {
	return NewServerCtx(nil)
}

func (sh *ServerHandlers) Init(serverCtx ServerCtx) error {
	return nil
}

func (sh *ServerHandlers) OnStart(serverCtx ServerCtx) error {
	return nil
}

func (sh *ServerHandlers) OnStop(serverCtx ServerCtx) {

}

func (sh *ServerHandlers) Destroy(serverCtx ServerCtx) {

}

func (sh *ServerHandlers) Listener(serverCtx ServerCtx) (net.Listener, error) {
	return nil, fmt.Errorf("Server: Method[ServerHandler.Listener] is not implemented")
}

func (sh *ServerHandlers) GetName() string {
	return sh.Name
}

func (sh *ServerHandlers) GetConcurrency() int {
	return sh.Concurrency
}

func (sh *ServerHandlers) GetHandshakeTimeout() time.Duration {
	return sh.HandshakeTimeout
}

func (sh *ServerHandlers) GetMaxMessageSize() int64 {
	return sh.MaxMessageSize
}

func (sh *ServerHandlers) GetReadBufferSize() int {
	return sh.ReadBufferSize
}

func (sh *ServerHandlers) GetWriteBufferSize() int {
	return sh.WriteBufferSize
}

func (sh *ServerHandlers) GetReadTimeout() time.Duration {
	return sh.ReadTimeout
}
func (sh *ServerHandlers) GetWriteTimeout() time.Duration {
	return sh.WriteTimeout
}
func (sh *ServerHandlers) GetPongTimeout() time.Duration {
	return sh.PongTimeout
}
func (sh *ServerHandlers) GetPingTimeout() time.Duration {
	return sh.PingTimeout
}
func (sh *ServerHandlers) GetPingPeriod() time.Duration {
	return sh.PingPeriod
}

func (sh *ServerHandlers) IsEnableCompression() bool {
	return sh.EnableCompression
}

func (sh *ServerHandlers) Validate() error {
	if "" == sh.Name {
		sh.Name = "Server"
	}

	if sh.Concurrency <= 0 {
		sh.Concurrency = DefaultConcurrency
	}

	if sh.HandshakeTimeout <= 0 {
		sh.HandshakeTimeout = DefaultHandshakeTimeout
	}
	if sh.MaxMessageSize <= 0 {
		sh.MaxMessageSize = DefaultMaxMessageSize
	}
	if sh.ReadBufferSize <= 0 {
		sh.ReadBufferSize = DefaultReadBufferSize
	}
	if sh.WriteBufferSize <= 0 {
		sh.WriteBufferSize = DefaultWriteBufferSize
	}
	if sh.ReadTimeout <= 0 {
		sh.ReadTimeout = DefaultReadTimeout
	}
	if sh.WriteTimeout <= 0 {
		sh.WriteTimeout = DefaultWriteTimeout
	}
	if sh.PongTimeout <= 0 {
		sh.PongTimeout = DefaultPongTimeout
	}
	if sh.PingTimeout <= 0 {
		sh.PingTimeout = DefaultPingTimeout
	}
	if sh.PingPeriod <= 0 {
		sh.PingPeriod = (sh.PingTimeout * 9) / 10
	}

	return nil
}