import { makeAutoObservable, runInAction } from "mobx";
import type { WorldState } from "./worldState";
import { type ObjectInstance, type Pos3, type R3, type V3, type RuntimeScene } from "../types";
import { createObjectInstance } from "../utils/object";
import { randomId } from "../utils";
import { state } from "./rootState";
import { populateRuntimeObject } from "../utils/runtime";

export const ObjectEditModeEnum = [
    'translate',
    'rotate',
    'scale',
] as const;
type ObjectEditModeTuple = typeof ObjectEditModeEnum;
export type ObjectEditMode = ObjectEditModeTuple[number];

export function nextObjectEditMode(mode: ObjectEditMode | undefined): ObjectEditMode {
    if (mode === undefined)
        return ObjectEditModeEnum[0];

    const idx = ObjectEditModeEnum.indexOf(mode);
    return ObjectEditModeEnum[(idx + 1) % ObjectEditModeEnum.length];
}

export const ObjectTypeEditModeEnum = [
    'scripts',
] as const;
type ObjectTypeEditModeTuple = typeof ObjectTypeEditModeEnum;
export type ObjectTypeEditMode = ObjectTypeEditModeTuple[number];

export function nextObjectTypeEditMode(mode: ObjectTypeEditMode | undefined): ObjectTypeEditMode {
    if (mode === undefined)
        return ObjectTypeEditModeEnum[0];

    const idx = ObjectTypeEditModeEnum.indexOf(mode);
    return ObjectTypeEditModeEnum[(idx + 1) % ObjectTypeEditModeEnum.length];
}

export type SelectedObject = {
    type: 'object',
    id: string;
    editMode: ObjectEditMode;
}

export type SelectedObjectType = {
    type: 'objectType',
    id: string;
    editMode: ObjectTypeEditMode;
}

export type Selection = SelectedObject | SelectedObjectType;

export class WorldEditorState {
    private readonly world: WorldState;

    public selection: Selection | undefined;

    constructor(world: WorldState) {
        this.world = world;
        makeAutoObservable(this);
    }

    public get isEnabled(): boolean {
        return !state.game;
    }

    public setCamera(value: Pos3): void {
        this.world.data.editorCamera = value;
    }

    public setSelection(value: Selection | undefined): void {
        this.selection = value;
    }

    public setSelectedObject(value: Omit<SelectedObject, 'type'> | undefined): void {
        this.setSelection(value
            ? {
                type: 'object',
                ...value,
            }
            : undefined,
        );
    }

    public setSelectedObjectType(value: Omit<SelectedObjectType, 'type'> | undefined): void {
        this.setSelection(value
            ? {
                type: 'objectType',
                ...value,
            }
            : undefined,
        );
    }

    public resetSelection() {
        this.setSelection(undefined);
    }

    public get scene(): RuntimeScene {
        return this.world.data.initialScene;
    }

    public get camera(): Pos3 {
        return this.world.data.editorCamera;
    }

    public setObjectTransform(id: string, position: V3, rotation: R3, scale: V3): void {
        const obj = this.scene.objects[id];
        if (!obj)
            return;

        runInAction(() => { // all in one go
            obj.position = position;
            obj.rotation = rotation;
            obj.scale = scale;
        });
    }

    public addObjectInstanceAtRandomPosition(typeId: string): ObjectInstance {
        return this.addObjectInstance(
            typeId,
            { x: Math.random() * 3, y: Math.random() * 3, z: Math.random() * 1 },
        );
    }

    public addObjectInstance(
        typeId: string,
        pos: { x: number; y: number; z: number; },
    ): ObjectInstance {
        const obj = populateRuntimeObject(createObjectInstance(randomId(), typeId), this.world.data);
        obj.position = [pos.x, pos.y, pos.z];
        obj.rotation = [0, 0, 0];

        this.scene.objects[obj.id] = obj;

        this.setSelectedObject({ id: obj.id, editMode: 'translate' });

        return obj;
    }

    public deleteObject(objectId: string) {
        if (this.selection?.type ==='object' && this.selection.id === objectId)
            this.resetSelection();
        delete (this.scene.objects[objectId]);            
    }
}