package types

import (
	"encoding/json"
	"fmt"
	"reflect"

	"github.com/tendermint/go-crypto"
	"github.com/tendermint/go-event-meter"
	"github.com/tendermint/go-events"
	client "github.com/tendermint/go-rpc/client"
	"github.com/tendermint/go-wire"
	ctypes "github.com/tendermint/tendermint/rpc/core/types"
)

//------------------------------------------------
// validator types

// validator set (independent of chains)
type ValidatorSet struct {
	Validators []*Validator `json:"validators"`
}

func (vs *ValidatorSet) Validator(valID string) (*Validator, error) {
	for _, v := range vs.Validators {
		if v.ID == valID {
			return v, nil
		}
	}
	return nil, fmt.Errorf("Unknwon validator %s", valID)
}

// validator (independent of chain)
type Validator struct {
	ID     string        `json:"id"`
	PubKey crypto.PubKey `json:"pub_key"`
	Chains []string      `json:"chains"`
}

// Validator on a chain
// Responsible for communication with the validator
// Returned over RPC but also used to manage state
type ChainValidator struct {
	Validator *Validator `json:"validator"`
	Addr      string     `json:"addr"` // do we want multiple addrs?
	Index     int        `json:"index"`

	Latency     float64 `json:"latency" wire:"unsafe"`
	BlockHeight int     `json:"block_height"`

	em     *eventmeter.EventMeter // holds a ws connection to the val
	client *client.ClientURI      // rpc client

}

// Start a new event meter, including the websocket connection
// Also create the http rpc client for convenienve
func (cv *ChainValidator) Start() error {
	em := eventmeter.NewEventMeter(fmt.Sprintf("ws://%s/websocket", cv.Addr), UnmarshalEvent)
	if err := em.Start(); err != nil {
		return err
	}
	cv.em = em
	cv.client = client.NewClientURI(fmt.Sprintf("http://%s", cv.Addr))
	return nil
}

func (cv *ChainValidator) Stop() {
	cv.em.Stop()
}

func (cv *ChainValidator) EventMeter() *eventmeter.EventMeter {
	return cv.em
}

// Return the validators pubkey. If it's not yet set, get it from the node
// TODO: proof that it's the node's key
func (cv *ChainValidator) PubKey() crypto.PubKey {
	if cv.Validator.PubKey != nil {
		return cv.Validator.PubKey
	}

	var result ctypes.TMResult
	_, err := cv.client.Call("status", nil, &result)
	if err != nil {
		log.Error("Error getting validator pubkey", "addr", cv.Addr, "val", cv.Validator.ID, "error", err)
		return nil
	}
	status := result.(*ctypes.ResultStatus)
	cv.Validator.PubKey = status.PubKey
	return cv.Validator.PubKey
}

//---------------------------------------------------
// utilities

// Unmarshal a json event
func UnmarshalEvent(b json.RawMessage) (string, events.EventData, error) {
	var err error
	result := new(ctypes.TMResult)
	wire.ReadJSONPtr(result, b, &err)
	if err != nil {
		return "", nil, err
	}
	event, ok := (*result).(*ctypes.ResultEvent)
	if !ok {
		return "", nil, fmt.Errorf("Result is not type *ctypes.ResultEvent. Got %v", reflect.TypeOf(*result))
	}
	return event.Name, event.Data, nil

}