package doormen

import (
	"encoding/json"
	"math"
	"testing"

	"github.com/didiercrunch/doorman/shared"
	"gopkg.in/mgo.v2/bson"
)

func TestNewDoormanDefinition(t *testing.T) {
	dmd := NewDoormanDefinition("some_name")
	if dmd.Id == "" {
		t.Error("need id at all time")
	}
	if dmd.Name != "some_name" {
		t.Error("bad name")
	}
}

func TestValidate(t *testing.T) {
	dmd := &DoormanDefinition{Name: ""}
	if err := dmd.Validate(); err.Error() != "name cannot be empty" {
		t.Error(err)
	}
	dmd = &DoormanDefinition{Name: "foo"}
	if err := dmd.Validate(); err.Error() != "need at least 2 values" {
		t.Error(err)
	}
	dmd = &DoormanDefinition{Name: "foo", Values: []*DoormanValue{nil}}
	if err := dmd.Validate(); err.Error() != "need at least 2 values" {
		t.Error(err)
	}

	dmd = &DoormanDefinition{Name: "foo", Values: []*DoormanValue{&DoormanValue{"foo", 0}, &DoormanValue{"foo", 0}}}
	if err := dmd.Validate(); err.Error() != "doorman value names must be unique within a doorman" {
		t.Error(err)
	}

	dmd = &DoormanDefinition{Name: "foo", Values: []*DoormanValue{&DoormanValue{"foo", 0}, &DoormanValue{"", 0}}}
	if err := dmd.Validate(); err.Error() != "doorman value cannot be empty" {
		t.Error(err)
	}

	dmd = &DoormanDefinition{Name: "foo", Values: []*DoormanValue{&DoormanValue{"foo", -0.25}, &DoormanValue{"bar", 0.5}}}
	if err := dmd.Validate(); err.Error() != "doorman value -0.25 is out of range" {
		t.Error(err)
	}

	dmd = &DoormanDefinition{Name: "foo", Values: []*DoormanValue{&DoormanValue{"foo", 2.5}, &DoormanValue{"bar", 0.5}}}
	if err := dmd.Validate(); err.Error() != "doorman value 2.5 is out of range" {
		t.Error(err)
	}

	dmd = &DoormanDefinition{Name: "foo", Values: []*DoormanValue{&DoormanValue{"foo", 0.75}, &DoormanValue{"bar", 0.5}}}
	if err := dmd.Validate(); err.Error() != "the sum of the probability must be 1.0" {
		t.Error(err)
	}
}

func TestAsJson(t *testing.T) {
	id := &DoormanId{}
	if `{}` != id.AsJson() {
		t.Fail()
	}
	id.Name = "bob"
	if `{}` != id.AsJson() {
		t.Fail()
	}

	id.Id = bson.ObjectIdHex("54af464af6fb5e20c4000003")
	if `{"54af464af6fb5e20c4000003":"bob"}` != id.AsJson() {
		t.Error(id.AsJson())
	}
}

func TestAsDoormanUpdatePayload(t *testing.T) {
	wd := &DoormanDefinition{}
	wd.Id = bson.NewObjectId()
	wd.Values = []*DoormanValue{&DoormanValue{"C", 0.25}, &DoormanValue{"T1", 0.75}}
	data, err := wd.AsDoormanUpdatePayload()
	if err != nil {
		t.Error(err)
		return
	}
	wu := &shared.DoormanUpdater{}
	if err := json.Unmarshal(data, wu); err != nil {
		t.Error(err)
	}
	if wd.Id.Hex() != wu.Id {
		t.Error("bad id", wu.Id)
	}
	if len(wu.Probabilities) != 2 {
		t.Error("bad probability length")
	} else if math.Abs(wu.Probabilities[0]-0.25) > epsilon {
		t.Error("bad first probability")
	} else if math.Abs(wu.Probabilities[1]-0.75) > epsilon {
		t.Error("bad second probability")
	} else if wu.Timestamp == 0 {
		t.Error("no time specify")
	} else if wu.Timestamp < 1421537442 {
		t.Error("timestamp looks weird")
	}
}

func TestQuickNewDoormanDefinition(t *testing.T) {
	dmd := QuickNewDoormanDefinition("foo", 0.75, 0.25)
	if dmd.Name != "foo" {
		t.Error()
	}

	if len(dmd.Values) != 2 {
		t.Error()
	}

	if dmd.Values[0].Name != "T0" || dmd.Values[0].Probability != 0.75 {
		t.Error()
	}

	if dmd.Values[1].Name != "T1" || dmd.Values[1].Probability != 0.25 {
		t.Error()
	}
}