package globalconfig

import (
	"encoding/json"
	"iter"
	"net"
	"os"
	"strconv"
	"strings"
	"time"

	"github.com/evcc-io/evcc/api"
	"github.com/evcc-io/evcc/charger/ocpp"
	"github.com/evcc-io/evcc/hems/shm"
	"github.com/evcc-io/evcc/plugin/mqtt"
	"github.com/evcc-io/evcc/server/eebus"
	"github.com/evcc-io/evcc/util"
	"github.com/evcc-io/evcc/util/config"
	"github.com/evcc-io/evcc/util/modbus"
)

// ConfigStatus for publishing config, status and source to UI and external systems
type ConfigStatus struct {
	Config     any        `json:"config,omitempty"`
	Status     any        `json:"status,omitempty"`
	YamlSource YamlSource `json:"yamlSource,omitempty"`
}

type YamlSource string

const (
	YamlSourceFile YamlSource = "file"
	YamlSourceDb   YamlSource = "db"
	YamlSourceNone YamlSource = ""
)

type All struct {
	Network         Network
	Ocpp            ocpp.Config
	Log             string
	SponsorToken    string
	Plant           string // telemetry plant id
	Telemetry       bool
	Mcp             bool
	Metrics         bool
	Profile         bool
	Levels          map[string]string
	Interval        time.Duration
	Database        DB
	Mqtt            Mqtt
	ModbusProxy     []ModbusProxy
	Javascript      []Javascript
	Go              []Go
	Influx          Influx
	EEBus           eebus.Config
	HEMS            Hems
	SHM             shm.Config
	Messaging       Messaging
	MessagingEvents MessagingEvents
	Meters          []config.Named
	Chargers        []config.Named
	Vehicles        []config.Named
	Tariffs         Tariffs
	Site            map[string]any
	Loadpoints      []config.Named
	Circuits        []config.Named
}

type Javascript struct {
	VM     string
	Script string
}

type Go struct {
	VM     string
	Script string
}

type ModbusProxy struct {
	Port            int    `json:"port"`
	ReadOnly        string `yaml:",omitempty" json:"readonly,omitempty"`
	modbus.Settings `mapstructure:",squash" yaml:",inline,omitempty" json:"settings,omitempty"`
}

var _ api.Redactor = (*Hems)(nil)

type Hems config.Typed

func (c Hems) Redacted() any {
	return struct {
		Type string `json:"type,omitempty"`
	}{
		Type: c.Type,
	}
}

var _ api.Redactor = (*Mqtt)(nil)

type Mqtt struct {
	mqtt.Config `mapstructure:",squash"`
	Topic       string `json:"topic"`
}

// Redacted implements the redactor interface used by the tee publisher
func (m Mqtt) Redacted() any {
	return Mqtt{
		Config: mqtt.Config{
			Broker:     m.Broker,
			User:       m.User,
			Password:   util.Masked(m.Password),
			ClientID:   m.ClientID,
			Insecure:   m.Insecure,
			CaCert:     util.Masked(m.CaCert),
			ClientCert: util.Masked(m.ClientCert),
			ClientKey:  util.Masked(m.ClientKey),
		},
		Topic: m.Topic,
	}
}

// Influx is the influx db configuration
type Influx struct {
	URL      string `json:"url"`
	Database string `json:"database"`
	Token    string `json:"token"`
	Org      string `json:"org"`
	User     string `json:"user"`
	Password string `json:"password"`
	Insecure bool   `json:"insecure"`
}

// Redacted implements the redactor interface used by the tee publisher
func (c Influx) Redacted() any {
	return Influx{
		URL:      c.URL,
		Database: c.Database,
		Token:    util.Masked(c.Token),
		Org:      c.Org,
		User:     c.User,
		Password: util.Masked(c.Password),
		Insecure: c.Insecure,
	}
}

type DB struct {
	Type string
	Dsn  string
}

type Messaging struct {
	Events   MessagingEvents
	Services []config.Typed
}

type MessagingEvents = map[string]MessagingEventTemplate

// MessagingEventTemplate is the push message configuration for an event
type MessagingEventTemplate struct {
	Title    string `json:"title"`
	Msg      string `json:"msg"`
	Disabled bool   `json:"disabled"`
}

func (c Messaging) IsConfigured() bool {
	return len(c.Services) > 0 || len(c.Events) > 0
}

type Tariffs struct {
	Currency string
	Grid     config.Typed
	FeedIn   config.Typed
	Co2      config.Typed
	Planner  config.Typed
	Solar    []config.Typed
}

func (c Tariffs) IsConfigured() bool {
	return c.Currency != "" || c.Grid.Type != "" || c.FeedIn.Type != "" || c.Co2.Type != "" || c.Planner.Type != "" || len(c.Solar) > 0
}

type TariffRefs struct {
	Grid    string   `json:"grid"`
	FeedIn  string   `json:"feedIn"`
	Co2     string   `json:"co2"`
	Planner string   `json:"planner"`
	Solar   []string `json:"solar"`
}

func (refs TariffRefs) IsConfigured() bool {
	return refs.Grid != "" || refs.FeedIn != "" || refs.Co2 != "" || refs.Planner != "" || len(refs.Solar) > 0
}

func (refs TariffRefs) Used() iter.Seq[string] {
	return func(yield func(string) bool) {
		for _, ref := range append([]string{refs.Grid, refs.FeedIn, refs.Co2, refs.Planner}, refs.Solar...) {
			if ref != "" {
				if !yield(ref) {
					return
				}
			}
		}
	}
}

type Network struct {
	Schema_     string `json:"schema,omitempty" mapstructure:"schema"` // TODO deprecated
	ExternalUrl string `json:"externalUrl"`
	Host        string `json:"host"`
	Port        int    `json:"port"`
}

func (c Network) HostPort() string {
	host := "localhost"
	if h, err := os.Hostname(); err == nil {
		host = h
	}
	if ips := util.LocalIPs(); len(ips) > 0 {
		host = ips[0].IP.String()
	}
	if c.Port == 80 {
		return host
	}
	return net.JoinHostPort(host, strconv.Itoa(c.Port))
}

func (c Network) InternalURL() string {
	return "http://" + c.HostPort()
}

func (c Network) ExternalURL() string {
	if c.ExternalUrl != "" {
		return strings.TrimRight(c.ExternalUrl, "/")
	}
	return c.InternalURL()
}

// MarshalJSON includes the computed InternalUrl field in JSON output
func (c Network) MarshalJSON() ([]byte, error) {
	type networkAlias Network
	return json.Marshal(struct {
		networkAlias
		InternalUrl string `json:"internalUrl"`
	}{
		networkAlias: networkAlias(c),
		InternalUrl:  c.InternalURL(),
	})
}