package main

import (
	"time"

	"github.com/gen2brain/raylib-go/raylib"
)

type ClientAuth struct {
	
}

type Entity struct {
	
}

type LoginState int

const (
	LOGIN_STATE_CREDENTIALS LoginState = iota
	LOGIN_STATE_ATTEMPTING
	LOGIN_STATE_ERROR
)

type ButtonState int

const (
	BUTTON_STATE_IDLE ButtonState = iota
	BUTTON_STATE_HOVER
	BUTTON_STATE_PRESSED
)

type Scale struct {
	window rl.Vector2
	ui uint
}

type ClientState struct {
	auth *ClientAuth
	login LoginState
	login_button ButtonState
	scale Scale
	screen rl.Rectangle
	camera rl.Camera

	command_queue chan interface{}
	network_queue chan interface{}

	context *Entity
	context_pos rl.Vector2
}

const (
	WIDTH  uint = 1600
  HEIGHT uint = 1000
)

func scale(original rl.Rectangle, scale Scale) rl.Rectangle {
	return rl.Rectangle{
		X: original.X,
		Y: original.Y,
		Width: original.Width*float32(scale.ui)/scale.window.X,
		Height: original.Height*float32(scale.ui)/scale.window.Y,
	}
}

func offset(original rl.Rectangle, off_x, off_y int, scale Scale) rl.Rectangle {
	return rl.Rectangle{
		X: original.X + float32(off_x)/scale.window.X,
		Y: original.Y + float32(off_y)/scale.window.Y,
		Width: original.Width,
		Height: original.Height,
	}
}

func center(container, original rl.Rectangle) rl.Rectangle {
	return rl.Rectangle{
		X: (container.Width  - original.Width )/2 + container.X,
		Y: (container.Height - original.Height)/2 + container.Y,
		Width: original.Width,
		Height: original.Height,
	}
}

func button(rectangle rl.Rectangle, idle, hover, pressed rl.Color, text string, font_size int32, text_color rl.Color, last_state ButtonState) (action bool, next_state ButtonState) {
	over := rl.CheckCollisionPointRec(rl.GetMousePosition(), rectangle)
	action = false
	next_state = last_state

	if(rl.IsMouseButtonPressed(rl.MouseButtonLeft) && over) {
		next_state = BUTTON_STATE_PRESSED
	} else if(rl.IsMouseButtonReleased(rl.MouseButtonLeft) && last_state == BUTTON_STATE_PRESSED) {
		next_state = BUTTON_STATE_IDLE
		if(over) {
			action = true
		}
	} else if(rl.IsMouseButtonUp(rl.MouseButtonLeft)) {
		if(last_state == BUTTON_STATE_IDLE && over) {
			next_state = BUTTON_STATE_HOVER
		} else if (last_state == BUTTON_STATE_HOVER && !over) {
			next_state = BUTTON_STATE_IDLE
		}	
	}
	
	var color rl.Color
	switch(next_state) {
	case BUTTON_STATE_HOVER:
		color = hover
	case BUTTON_STATE_PRESSED:
		color = pressed
	default:
		color = idle
	}
	rl.DrawRectangleRec(rectangle, color)
	text_size := rl.MeasureTextEx(rl.GetFontDefault(), text, float32(font_size), 1.0)
	rl.DrawText(text, int32(rectangle.X + rectangle.Width/2 - text_size.X/2), int32(rectangle.Y + rectangle.Height/2 - text_size.Y/2), font_size, text_color)

	return action, next_state
}

func NetworkThread(network_queue chan interface{}) {
	for(true) {
		// TODO: remove
		time.Sleep(time.Millisecond)
	}
}

func LogicThread(state *ClientState) {
	for(true) {
		select {
			case _ = <- state.command_queue:
			case _ = <- state.network_queue:
		}
		time.Sleep(time.Millisecond)
	}
}

func main() {
	state := ClientState{
		auth: nil,
		login: LOGIN_STATE_CREDENTIALS,
		login_button: BUTTON_STATE_IDLE,
		scale: Scale{
			ui: 1,
		},
		camera: rl.NewCamera3D(rl.Vector3{}, rl.Vector3{}, rl.Vector3{}, 90, rl.CameraOrthographic),
		context: nil,
	}

	go LogicThread(&state)

	rl.SetConfigFlags(rl.FlagWindowHighdpi)
	rl.InitWindow(0, 0, "roleplay")
	rl.SetExitKey(0)
	rl.SetTargetFPS(60)

	state.scale.window = rl.GetWindowScaleDPI()
	rl.SetWindowSize(int(float32(WIDTH)/state.scale.window.X), int(float32(HEIGHT)/state.scale.window.Y))

	state.screen.Width  = float32(WIDTH) /state.scale.window.X
	state.screen.Height = float32(HEIGHT)/state.scale.window.Y

	for(rl.WindowShouldClose() == false) {
		if(state.auth == nil) {
			// Draw login
			rl.BeginDrawing()
			rl.ClearBackground(rl.Black)

			logo_rect := scale(rl.Rectangle{Width: 1200, Height: 300}, state.scale)
			logo_rect = center(state.screen, logo_rect)
			logo_rect = offset(logo_rect, 0, -250, state.scale)
			rl.DrawRectangleRec(logo_rect, rl.Gray)

			form_rect := scale(rl.Rectangle{Width: 600, Height: 400}, state.scale)
			form_rect = center(state.screen, form_rect)
			form_rect = offset(form_rect, 0, 200, state.scale)
			rl.DrawRectangleRec(form_rect, rl.Gray)

			switch(state.login) {
			case LOGIN_STATE_CREDENTIALS:
				submit_rect := scale(rl.Rectangle{Width: 100, Height: 50}, state.scale)
				submit_rect = center(form_rect, submit_rect)
				submit_rect = offset(submit_rect, 0, 125, state.scale)
				var submit_action bool
				submit_action, state.login_button = button(submit_rect, rl.Black, rl.Brown, rl.Red, "Submit", 12, rl.White, state.login_button)
				if submit_action {
					// TODO: real auth via network thread
					state.auth = &ClientAuth{}
				}
			case LOGIN_STATE_ATTEMPTING:
				text := "Logging in..."
				text_size := rl.MeasureTextEx(rl.GetFontDefault(), text, 20, 1.0)
				text_rect := center(form_rect, rl.Rectangle{Width: text_size.X, Height: text_size.Y})
				rl.DrawText(text, int32(text_rect.X), int32(text_rect.Y), 20, rl.Black)
			case LOGIN_STATE_ERROR:
				text := "Error: {TODO}"
				text_size := rl.MeasureTextEx(rl.GetFontDefault(), text, 20, 1.0)
				text_rect := center(form_rect, rl.Rectangle{Width: text_size.X, Height: text_size.Y})
				rl.DrawText(text, int32(text_rect.X), int32(text_rect.Y), 20, rl.Black)
			}

			rl.EndDrawing()
		} else {
			rl.BeginDrawing()
			rl.ClearBackground(rl.Black)
			rl.BeginMode3D(state.camera)

			if rl.IsMouseButtonPressed(rl.MouseButtonRight) {
				state.context_pos = rl.GetMousePosition()
				// TODO: Cast a ray into the bounding boxes
			}

			if state.context != nil {
				
			}

			rl.EndMode3D()
			rl.EndDrawing()
		}
	}
}