package config

import (
	"errors"
	"reflect"

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

// JSCKServer is the server section's configuration key.
const JSCKServer string = "server"

// JSCServer configures the outward server. Host is the address to listen
// on (empty means every interface) and Port the port (0 means any free
// port). MaxHeaderBytes is the largest request header block; 0 means the
// default (8KB), and -1 (no limit) is rejected (see validate). MaxBodyBytes is
// the largest request body; 0 means the default (1MB) and -1 no limit.
type JSCServer struct {
	Host           string              `cfg:"host"             default:"127.0.0.1"`
	Port           int                 `cfg:"port"             default:"9393"`
	MaxHeaderBytes util.ByteSize       `cfg:"max_header_bytes" default:"8KB"`
	MaxBodyBytes   util.ByteSize       `cfg:"max_body_bytes"   default:"1MB"`
	Timeouts       JSCServerTimeouts   `cfg:"timeouts"`
	RateLimits     JSCServerRateLimits `cfg:"rate_limits"`
	Proxy          JSCServerProxy      `cfg:"proxy"`
	CSRF           JSCServerCSRF       `cfg:"csrf"`
	TLS            JSCServerTLS        `cfg:"tls"`
	Headers        JSCServerHeaders    `cfg:"headers"`
	Frontend       JSCServerFrontend   `cfg:"frontend"`
	WebSocket      JSCServerWebSocket  `cfg:"websocket"`
}

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

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

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

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

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

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

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

// validate checks values before they are stored (see validator).
// max_header_bytes can't be -1 (no limit): the HTTP server always limits the
// header block, so -1 would quietly mean its own default instead.
func (c *JSCServer) validate(key string, value any) error {
	if key == "max_header_bytes" &&
		value.(util.ByteSize) == util.ByteSizeNoLimit {
		return errors.New(
			"config: max_header_bytes can't be -1 (no limit): set an explicit size, or 0 for the default",
		)
	}
	return nil
}