package game

import (
	"log"
	"math"
	"os"
	"runtime"

	"edgaru089.ml/go/gl01/internal/asset"
	"edgaru089.ml/go/gl01/internal/igwrap"
	"edgaru089.ml/go/gl01/internal/igwrap/backend"
	"edgaru089.ml/go/gl01/internal/io"
	"edgaru089.ml/go/gl01/internal/util/itype"
	"edgaru089.ml/go/gl01/internal/world"
	"github.com/go-gl/glfw/v3.3/glfw"
	"github.com/inkyblackness/imgui-go/v4"
)

type guiState struct {
	showLog, showDebugInfo bool
	logFollow              bool

	lastframeCgoCalls int64

	loadChunkFile string
	loadChunkID   [2]int32

	saveChunkFile string
	saveChunkID   [2]int32
}

func (g *Game) initImgui(win *glfw.Window) {
	imgui.CreateContext(nil)
	g.io = imgui.CurrentIO()

	cfg := imgui.NewFontConfig()
	cfg.SetOversampleH(1)
	cfg.SetOversampleV(1)
	cfg.SetPixelSnapH(true)
	g.io.Fonts().AddFontFromMemoryTTFV(asset.Unifont, 16, cfg, g.io.Fonts().GlyphRangesChineseFull())
	backend.Init(win)

	g.gui = guiState{
		showLog:       true,
		showDebugInfo: false,
		logFollow:     true,
		loadChunkFile: "chunk.gob",
		loadChunkID:   [2]int32{0, 0},
		saveChunkFile: "chunk.gob",
		saveChunkID:   [2]int32{0, 0},
	}
}

func (g *Game) imgui() {
	if io.ShowDebugInfo {
		imgui.SetNextWindowPosV(imgui.Vec2{}, imgui.ConditionAlways, imgui.Vec2{})
		if igwrap.Begin("F3", nil, imgui.WindowFlagsAlwaysAutoResize|imgui.WindowFlagsNoBackground|imgui.WindowFlagsNoNavFocus|imgui.WindowFlagsNoDecoration|imgui.WindowFlagsNoInputs|imgui.WindowFlagsNoSavedSettings|imgui.WindowFlagsNoFocusOnAppearing) {
			igwrap.Text("Gl01(glfw%s, imgui%s) - compiled by %s[%s/%s]", glfw.GetVersionString(), imgui.Version(), runtime.Version(), runtime.GOOS, runtime.GOARCH)
			igwrap.Text("CgoCalls:%d (%d lastframe), Goroutines:%d", runtime.NumCgoCall(), runtime.NumCgoCall()-g.gui.lastframeCgoCalls, runtime.NumGoroutine())
			imgui.Text("")

			pos := g.player.Position()
			igwrap.Text("Player: (%.3f, %.5f, %.3f) - (Y%.2f, Z%.2f)", pos[0], pos[1], pos[2], g.rotY.Degrees(), g.rotZ)
			imgui.End()
		}
	}
	g.gui.lastframeCgoCalls = runtime.NumCgoCall()

	if imgui.BeginV("Player", nil, imgui.WindowFlagsAlwaysAutoResize) {
		pos := g.player.Position()
		vel := g.player.Speed()
		igwrap.Text("Pos: (%.5f, %.5f, %.5f), Vel: (%.5f, %.5f, %.5f)", pos[0], pos[1], pos[2], vel[0], vel[1], vel[2])
		igwrap.Text("VelXZ=%.5f, VelXYZ=%.5f", math.Sqrt(vel[0]*vel[0]+vel[2]*vel[2]), vel.Length())
	}
	imgui.End()

	if igwrap.Begin("Logs", &g.gui.showLog, imgui.WindowFlagsMenuBar) {
		if imgui.BeginMenuBar() {
			if imgui.Button("Clear") {
				logs = ""
			}
			if imgui.Button("Add Logs") {
				for i := 0; i < 8; i++ {
					log.Print("Added logs")
				}
			}
			imgui.Checkbox("Autoscroll", &g.gui.logFollow)
			imgui.EndMenuBar()
		}

		imgui.BeginChildV("LogScroll", imgui.Vec2{}, true, 0)
		imgui.Text(logs)
		if g.gui.logFollow && imgui.ScrollY() >= imgui.ScrollMaxY() {
			imgui.SetScrollHereY(1.0)
		}
		imgui.EndChild()
		imgui.End()
	}

	if imgui.Begin("Actions") {

		imgui.Text("Chunks")
		imgui.Separator()
		imgui.InputText("Load Filename", &g.gui.loadChunkFile)
		imgui.SliderInt2("Load ID", &g.gui.loadChunkID, -10, 10)
		if imgui.ButtonV("Load", imgui.Vec2{X: -2, Y: 0}) {
			c := &world.Chunk{}
			f, err := os.Open(g.gui.loadChunkFile)
			if err != nil {
				log.Print("LoadChunk: ", err)
			} else {
				c.LoadFromGobIndexed(f, int(g.gui.loadChunkID[0]), int(g.gui.loadChunkID[1]))
				g.world.SetChunk(int(g.gui.loadChunkID[0]), int(g.gui.loadChunkID[1]), c)
			}
		}
		imgui.Separator()
		imgui.InputText("Save Filename", &g.gui.saveChunkFile)
		imgui.SliderInt2("Save ID", &g.gui.saveChunkID, -10, 10)
		if imgui.ButtonV("Save", imgui.Vec2{X: -2, Y: 0}) {
			c := g.world.Chunks[itype.Vec2i{int(g.gui.saveChunkID[0]), int(g.gui.saveChunkID[1])}]
			f, _ := os.Create(g.gui.saveChunkFile)
			c.WriteToGob(f)
			f.Close()
		}
		imgui.Separator()

	}
	imgui.End()
}