package config

import (
	"errors"
	"reflect"
	"time"

	"git.avsdev.uk/Go/job-search/internal/util"
)

// JSCKServerWebSocket is the websocket section's configuration key.
const JSCKServerWebSocket string = "websocket"

// JSCServerWebSocket configures the server's websocket connections.
// MaxMessageSize is the largest message read from a client; 0 means the
// default (32KiB), and -1 (no limit) is rejected (see validate). A
// WriteTimeout or PongTimeout of 0 or less means no limit, and a
// PingInterval of 0 or less turns pings off.
type JSCServerWebSocket struct {
	EnableCompression bool             `cfg:"enable_compression" default:"false"`
	MaxMessageSize    util.ByteSize    `cfg:"max_message_size"   default:"32KiB"`
	ConnectionLimit   JSCRateLimitRule `cfg:"connection_limit"`
	MessageRateLimit  JSCRateLimitRule `cfg:"message_rate_limit"`
	WriteTimeout      time.Duration    `cfg:"write_timeout"      default:"10s"`
	PingInterval      time.Duration    `cfg:"ping_interval"      default:"30s"`
	PongTimeout       time.Duration    `cfg:"pong_timeout"       default:"10s"`
}

// ---------- Section methods (see Section) ----------

// Map implements Section.
func (c JSCServerWebSocket) Map() map[string]any { return mapOf(c) }

// Flatten implements Section.
func (c JSCServerWebSocket) Flatten() map[string]any {
	return flattenOf(JSCKServerWebSocket, c)
}

// TypeOf implements Section.
func (c JSCServerWebSocket) TypeOf(key string) (reflect.Kind, error) {
	return typeOf(c, key)
}

// ValueOf implements Section.
func (c JSCServerWebSocket) ValueOf(key string) (any, error) {
	return valueOf(c, key)
}

// SetValue implements Section.
func (c *JSCServerWebSocket) SetValue(key string, value any) error {
	return setValue(c, key, value)
}

// ---------- Section specific methods ----------

// validate checks values before they are stored (see validator).
// max_message_size can't be -1 (no limit): a client could then send a
// message of any size, and the server holds each message in memory.
func (c *JSCServerWebSocket) validate(key string, value any) error {
	if key == "max_message_size" &&
		value.(util.ByteSize) == util.ByteSizeNoLimit {
		return errors.New(
			"config: max_message_size can't be -1 (no limit): set an explicit size, or 0 for the default",
		)
	}
	return nil
}