package energy

import (
	"context"
	"fmt"
	"log"
	"math"
	"strings"
	"time"

	"github.com/amigan/energyd/pkg/isoclient"
	"github.com/lucasb-eyer/go-colorful"
	"github.com/mazznoer/colorgrad"
)

type Energy struct {
	iso isoclient.Client
}

type LoadProfile struct {
	Time     time.Time
	Current  int
	Peak     int
	Lowest   int
	PeakHr   int
	LowestHr int

	PctPeak       int
	HoursAway     int
	HighFuel      string
	MarginalFuels MarginalFuels
}

type MarginalFuels []string

func (mf MarginalFuels) String() string {
	return strings.Join(mf, ", ")
}

func (e *Energy) Compute() error {
	ic := e.iso

	load, err := ic.GetCurrentLoad()
	if err != nil {
		return err
	}

	gphd, err := ic.GetHourlyLoadForecast()
	if err != nil {
		return err
	}

	fm, err := ic.GetGenFuelMixes()
	if err != nil {
		return err
	}

	lp := LoadProfile{
		Time:     load.BeginDate,
		Current:  int(load.LoadMW),
		LowestHr: -1,
	}

	if len(fm) > 0 {
		highGen := int(fm[0].GenMW)
		highFuel := fm[0]

		for _, mix := range fm {
			if int(mix.GenMW) > highGen {
				highGen = int(mix.GenMW)
				highFuel = mix
			}

			if mix.Marginal {
				lp.MarginalFuels = append(lp.MarginalFuels, mix.FuelCategory)
			}
		}

		lp.HighFuel = highFuel.FuelCategory
	}

	for h, hf := range gphd.HourlyLoadForecast {
		if int(hf.LoadMW) > lp.Peak {
			lp.Peak = int(hf.LoadMW)
			lp.PeakHr = h
		}

		if int(hf.LoadMW) < lp.Lowest || lp.LowestHr == -1 {
			lp.LowestHr = h
			lp.Lowest = int(hf.LoadMW)
		}
	}

	hour := time.Now().Hour()
	lp.PctPeak = int(float32(load.LoadMW/float32(lp.Peak)) * 100)
	lp.HoursAway = int(math.Abs(float64(hour) - float64(lp.PeakHr)))
	fmt.Println(lp.String())

	return nil
}

type Colors struct {
	Mix  [2]colorful.Color
	Peak [2]colorful.Color
}

func vaporwavePalette() []string {
	return []string{
		"#01cdfe", // blue
		"#05ffa1", // green
		"#fffb96", // gold
		"#ff71ce", // pinkred
		"#b967ff", // purple
	}
}

func outrunPalette() []string {
	return []string{
		"#2de2e6", // blue
		"#00ff1b", // green
		"#ff6c11", // gold
		"#ff3864", // pinkred
		"#7930ff", // purple
	}
}

func (lp *LoadProfile) PeakScaleColors() []string {
	var scale []string
	palette := outrunPalette()

	nowHr := time.Now().Hour() // XXX: get this from lp

	//if lp.HoursAway >

	_, _ = palette, nowHr

	return scale
}

func (lp *LoadProfile) String() string {
	return fmt.Sprintf("%s\tC: %d\tP: %d\tL: %d\tPeakHr: %d\tLowestHr: %d\t%%Pk: %d\tHrAway: %d\tPkFuel: %s\tMarginal: %s",
		lp.Time.String(), lp.Current, lp.Peak, lp.Lowest, lp.PeakHr, lp.LowestHr, lp.PctPeak, lp.HoursAway, lp.HighFuel, lp.MarginalFuels)
}

func (lp *LoadProfile) Colors() Colors {
	c := Colors{}

	peak, err := colorgrad.NewGradient().Domain(float64(lp.Lowest), float64(lp.Peak)).HtmlColors(lp.PeakScaleColors()...).Build()

	if err != nil {
		panic(err)
	}

	c.Peak[0] = peak.At(float64(time.Now().Hour()))

	return c
}

func (e *Energy) Go(ctx context.Context) {
	tick := time.NewTicker(time.Minute * 15)
	err := e.Compute()
	if err != nil {
		log.Println(err)
	}

	for {
		select {
		case <-tick.C:
			err := e.Compute()
			if err != nil {
				log.Println(err)
			}
		case <-ctx.Done():
			return
		}
	}
}

func New(ic isoclient.Client) *Energy {
	return &Energy{
		iso: ic,
	}
}