package dynamic

import (
	"encoding/json"
	"fmt"
	"os"

	coreobjects "github.com/DegustatorPonos/RuinesOfRafdolon/CoreObjects"
	descriptors "github.com/DegustatorPonos/RuinesOfRafdolon/Dynamic/Descriptors"
	ui "github.com/DegustatorPonos/RuinesOfRafdolon/UI"
	rl "github.com/gen2brain/raylib-go/raylib"
)

const MenusDirName string = "Menus"

const RefreshButton int32 = rl.KeyF5

// Represents a menu variant that is loaded from a file
type DynamicMenu struct {
	FileLocation string
	baseMenu *ui.Menu

	manager *coreobjects.SceneManager
}

func (base *DynamicMenu) Create(manager *coreobjects.SceneManager) {
	var err = base.LoadMenu()
	if err != nil {
		rl.TraceLog(rl.LogWarning, "Failed to load the menu from the file %v: %v", base.FileLocation, err.Error())
		base.baseMenu = &ui.Menu { 
			Contents: &ui.Void{},
		}
	}
	base.manager = manager
	base.baseMenu.Create(manager)
}

func (base *DynamicMenu) GetUpdateFunctions() []coreobjects.UpdateFunction {
	return []coreobjects.UpdateFunction{}
}

func (base *DynamicMenu) Destroy() {
	base.baseMenu.Destroy()
}

func (base *DynamicMenu) Update() {
	if rl.IsKeyReleased(RefreshButton) {
		rl.TraceLog(rl.LogInfo, "Reloading the menu '%v'...", base.FileLocation)
		var err = base.Reload()
		if err != nil {
			rl.TraceLog(rl.LogWarning, "Failed to reload a dynamic menu '%v': %v", base.FileLocation, err.Error())
		}
	}
	base.baseMenu.Update()
}

func (base *DynamicMenu) Draw() {
	base.baseMenu.Draw()
}

func (base *DynamicMenu) GetMousePosition() rl.Vector2 {
	return rl.GetMousePosition()
}

func (base *DynamicMenu) String() string {
	var outp, jsonErr = json.Marshal(base)
	if jsonErr != nil {
		return fmt.Sprintf("Failed to parse: %s", jsonErr.Error())
	}
	return string(outp)
}

// Loads the menu from the file. Does not initialize it
func (base *DynamicMenu) LoadMenu() error {
	var parsed, parseErr = base.readMenu()
	if parseErr != nil {
		return parseErr
	}
	base.baseMenu = parsed
	return nil
}

func (base *DynamicMenu) Reload() error {
	var parsed, parseErr = base.readMenu()
	if parseErr != nil {
		return parseErr
	}
	base.baseMenu.Destroy()
	base.baseMenu = parsed
	base.baseMenu.Create(base.manager)
	return nil
}

// Tries to read a base menu from the file
func (base *DynamicMenu) readMenu() (*ui.Menu, error) {
	var file, fErr = os.ReadFile(base.FileLocation)
	if fErr != nil {
		return nil, fErr
	}
	var descriptor = descriptors.MenuDescriptor{}
	if jsonErr := json.Unmarshal(file, &descriptor); jsonErr != nil {
		return nil, jsonErr
	}
	return descriptor.Parse()
}