package main

import (
	"errors"
	"git.massivebox.net/massivebox/go-catprinter"
	"github.com/makeworld-the-better-one/dither/v2"
	"image"
	"log"
	"strconv"
)

type Project struct {
	Og             image.Image
	User           int64
	Options        *catprinter.PrinterOptions
	DitherStrength float32
}

func (ctx *Context) createProject(fileID string, userID int64) {

	tmpMsgID := ctx.sendMessage(userID, "⏳ Processing...")

	img, err := ctx.fileIDtoImage(fileID)
	if err != nil {
		if errors.Is(err, image.ErrFormat) {
			ctx.sendMessage(userID, "🚫 File can't be parsed as an image. If you've sent a sticker, make sure it's not animated or part of an animated set.")
			return
		}
		log.Println("Got error getting image from FileID", err)
		ctx.sendMessage(userID, "🚫 Got an error obtaining image, try again")
		return
	}

	if float32(img.Bounds().Dx())/float32(img.Bounds().Dy()) < ctx.Settings.MaxRatio {
		ctx.sendMessage(userID, "🚫 Your image is too tall, please send a shorter image.")
		return
	}

	wip := Project{
		Og:             img,
		Options:        catprinter.NewOptions(),
		User:           userID,
		DitherStrength: 1,
	}

	putId := -1
	for i := 0; i < ctx.Settings.MaxProjects; i++ {
		if ctx.Projects[i] == nil {
			putId = i
			break
		}
	}

	if putId == -1 {
		ctx.sendMessage(userID, "🚫 We can't accept this project for now, try again later")
		return
	}

	ctx.Projects[putId] = &wip
	ctx.sendImage(userID, ctx.Client.FormatImage(wip.Og, wip.Options), getEditKeyboard(wip.Options, putId))
	ctx.deleteMessage(tmpMsgID, userID)

}

func changeBlackPointOrDitherStrength(proj *Project, delta float32) bool {
	if proj.Options.Dither() {
		if (proj.DitherStrength < 0.1 && delta < 0) || (proj.DitherStrength > 0.9 && delta > 0) {
			return false
		}
		proj.DitherStrength += delta
		proj.Options.SetDitherAlgo(dither.ErrorDiffusionStrength(dither.FloydSteinberg, proj.DitherStrength))
	} else {
		if (proj.Options.BlackPoint() < 0.1 && delta < 0) || (proj.Options.BlackPoint() > 0.9 && delta > 0) {
			return false
		}
		proj.Options.SetBlackPoint(proj.Options.BlackPoint() + delta)
	}
	return true
}

func (ctx *Context) editWip(queryCmd rune, projID int, userID int64, msgID int, cqID string) {

	proj := ctx.Projects[projID]
	if proj == nil {
		ctx.callbackQuery(cqID, "🤨 Project not found", true)
		return
	}
	if proj.User != userID {
		ctx.callbackQuery(cqID, "🔒 Can't edit this project", true)
		return
	}

	const limitTxt = "🛑 You've reached the limit"

	switch queryCmd {
	case 't': // toggle dithering
		proj.Options.SetBlackPoint(0.5)
		proj.DitherStrength = 1
		proj.Options.SetDitherAlgo(dither.ErrorDiffusionStrength(dither.FloydSteinberg, proj.DitherStrength))
		proj.Options.SetDither(!proj.Options.Dither())
		break
	case 'l': // lighter
		done := changeBlackPointOrDitherStrength(proj, -0.1)
		if !done {
			ctx.callbackQuery(cqID, limitTxt, true)
			return
		}
		break
	case 'b': // darker
		done := changeBlackPointOrDitherStrength(proj, +0.1)
		if !done {
			ctx.callbackQuery(cqID, limitTxt, true)
			return
		}
		break
	case 'p': // print
		if len(ctx.Queue) >= ctx.Settings.MaxQueueLength {
			ctx.callbackQuery(cqID, "🛑 There are already too many projects in queue, please wait...", true)
			return
		}
		ctx.Queue <- projID
		ctx.callbackQuery(cqID, "🖨 Waiting to print... There is/are "+strconv.Itoa(len(ctx.Queue))+" project(s) in queue before you.", true)
		ctx.editImage(userID, msgID, ctx.Client.FormatImage(proj.Og, proj.Options))
		return
	case 'd': // discard
		ctx.Projects[projID] = nil
		ctx.callbackQuery(cqID, "🗑 Project discarded", true)
		ctx.deleteMessage(msgID, userID)
		return
	}

	ctx.callbackQuery(cqID, "⏳ Loading...")
	ctx.editImage(userID, msgID, ctx.Client.FormatImage(proj.Og, proj.Options), getEditKeyboard(proj.Options, projID))

}