package tins2020

import (
	"fmt"
	"math/rand"
	"strconv"
	"strings"
	"time"

	"opslag.de/schobers/geom"

	"opslag.de/schobers/zntg"
	"opslag.de/schobers/zntg/ui"
)

type Research struct {
	ui.StackPanel

	game     *Game
	botanist Specialist
	farmer   Specialist

	description ui.Paragraph
	specialists ui.Paragraph
	dial        *Dial
	input       ui.Label

	animate        zntg.Animation
	closeRequested ui.Events
}

type Dialer interface {
	CanUserType(int) bool
	UserGaveWrongInput()
	UserTyped(ui.Context, int)
}

func NewResearch(game *Game) *LargeDialog {
	research := &Research{game: game}
	research.animate.Interval = 20 * time.Millisecond
	research.animate.Start()

	research.description.Text = "Call a specialist to conduct research with."
	research.dial = NewDial(research)
	research.Children = []ui.Control{&research.description, &research.specialists, research.dial, &research.input}

	dialog := NewLargeDialog("Research", ui.Stretch(research))
	research.closeRequested.AddHandlerEmpty(func(ctx ui.Context) { dialog.closeRequested.Notify(ctx, nil) })
	return dialog
}

type Specialist struct {
	Cost   int
	Number string
}

func (r *Research) Arrange(ctx ui.Context, bounds geom.RectangleF32, offset geom.PointF32, parent ui.Control) {
	r.input.TextAlignment = ui.AlignCenter
	r.StackPanel.Arrange(ctx, bounds, offset, parent)
}

func (r *Research) CanUserType(digit int) bool {
	typing := strconv.Itoa(digit)
	return strings.HasPrefix(r.botanist.Number, r.input.Text+typing)
}

func (r *Research) Hidden() {}

func (r *Research) Render(ctx ui.Context) {
	r.animate.AnimateFn(r.dial.Tick)
	r.StackPanel.Render(ctx)
}

func (r *Research) Shown() {
	generateNumber := func() string {
		var number string
		for i := 0; i < 3; i++ {
			number += strconv.Itoa(rand.Intn(9) + 1)
		}
		return number
	}

	r.input.Text = ""
	r.dial.Reset()

	var specialists string
	defer func() {
		r.specialists.Text = specialists
	}()

	_, _, price := r.game.Herbarium.NextFlowerToUnlock()
	if price == 0 {
		specialists += "Botanist (unlocks next flower; unavailable)\n"
		specialists += "Farmer (fertilizes land; unavailable)\n"
		return
	}

	r.botanist.Cost = price
	if r.game.Balance < r.botanist.Cost {
		r.botanist.Number = "**unavailable**"
	} else {
		r.botanist.Number = generateNumber()
	}

	specialists += fmt.Sprintf("Botanist: no. %s (unlocks next flower; $ %d)\n", r.botanist.Number, r.botanist.Cost)
	specialists += "Farmer: no. **unavailable** (fertilizes land; $ ---)\n"
}

func (r *Research) UserGaveWrongInput() {
	r.input.Text = ""
}

func (r *Research) UserTyped(ctx ui.Context, digit int) {
	r.input.Text += strconv.Itoa(digit)
	if r.input.Text == r.botanist.Number {
		r.game.UnlockNextFlower(ctx)
		r.input.Text = ""
		r.closeRequested.Notify(ctx, nil)
	}
}