package app

import (
	"fmt"
	"testing"

	"github.com/kortschak/ct"
)

type testcase struct {
	Data   powerData
	Result resultType
}

type resultType uint8

func (r resultType) String() string {
	return []string{``, `positive`, `negative`, ` neutral`}[r]
}

const (
	resultPositive = iota + 1
	resultNegative
	resultNeutral
)

func resultTypeFromScore(s float64) resultType {
	switch {
	case s < 1 && s > -1:
		return resultNeutral
	case s >= 1:
		return resultPositive
	case s <= -1:
		return resultNegative
	}
	panic(`Unreachable`)
}

var (
	passColor = ct.Fg(ct.BoldGreen).Paint
	infoColor = ct.Fg(ct.Yellow).Paint
)

func TestProductionScore(t *testing.T) {
	cases := []testcase{
		{powerData{Voltage: 240, MaxAmpere: 10, CosPhi: 0.8}, resultNegative},
		{powerData{Voltage: 230, MaxAmpere: 10, CosPhi: 0.4}, resultNegative},
		{powerData{Voltage: 230, MaxAmpere: 200, CosPhi: 0.8}, resultNegative},

		{powerData{Voltage: 220, MaxAmpere: 10, CosPhi: 0.8}, resultPositive},
		{powerData{Voltage: 230, MaxAmpere: 10, CosPhi: 1}, resultPositive},
		{powerData{Voltage: 230, MaxAmpere: 0, CosPhi: 0.8}, resultNeutral},

		{powerData{Voltage: 234, MaxAmpere: 10, CosPhi: 0.8}, resultNeutral},
		{powerData{Voltage: 226, MaxAmpere: 10, CosPhi: 0.8}, resultNeutral},

		{powerData{Voltage: 230, MaxAmpere: 10, CosPhi: 0.71}, resultNeutral},
		{powerData{Voltage: 230, MaxAmpere: 10, CosPhi: 0.89}, resultNeutral},

		{powerData{Voltage: 230, MaxAmpere: 120, CosPhi: 0.8}, resultNeutral},
	}

	testScore(t, cases, productionScore)
}

func TestUsageScore(t *testing.T) {
	cases := []testcase{
		{powerData{Voltage: 240, MaxAmpere: 10, CosPhi: 0.8}, resultPositive},
		{powerData{Voltage: 230, MaxAmpere: 200, CosPhi: 0.8}, resultNegative},

		{powerData{Voltage: 220, MaxAmpere: 10, CosPhi: 0.8}, resultNegative},
		{powerData{Voltage: 230, MaxAmpere: 0, CosPhi: 0.8}, resultNeutral},

		{powerData{Voltage: 234, MaxAmpere: 10, CosPhi: 0.8}, resultNeutral},
		{powerData{Voltage: 226, MaxAmpere: 10, CosPhi: 0.8}, resultNeutral},

		{powerData{Voltage: 230, MaxAmpere: 120, CosPhi: 0.8}, resultNeutral},
	}

	testScore(t, cases, usageScore)
}

func TestStorageScore(t *testing.T) {
	cases := []testcase{
		{powerData{Voltage: 240, MaxAmpere: 10, CosPhi: 0.8}, resultPositive},
		{powerData{Voltage: 230, MaxAmpere: 10, CosPhi: 0.4}, resultPositive},

		{powerData{Voltage: 220, MaxAmpere: 10, CosPhi: 0.8}, resultNegative},
		{powerData{Voltage: 230, MaxAmpere: 10, CosPhi: 1}, resultNegative},

		{powerData{Voltage: 234, MaxAmpere: 10, CosPhi: 0.8}, resultNeutral},
		{powerData{Voltage: 226, MaxAmpere: 10, CosPhi: 0.8}, resultNeutral},

		{powerData{Voltage: 230, MaxAmpere: 10, CosPhi: 0.71}, resultNeutral},
		{powerData{Voltage: 230, MaxAmpere: 10, CosPhi: 0.89}, resultNeutral},
	}

	testScore(t, cases, storageScore)
}

func testScore(t *testing.T, cases []testcase, f func(powerData) float64) {
	t.Helper()

	for _, v := range cases {
		s := f(v.Data)
		r := resultTypeFromScore(s)
		if r != v.Result {
			t.Error(`Expected a`, v.Result, `score, but got`, s)
			continue
		}

		score := fmt.Sprintf(`%6.2f`, s)
		t.Log(passColor(`PASS`), infoColor(v.Data), `->`, infoColor(r, `(`+score+`)`))
	}
}