sinProject-Inc/talk

import beach from '../assets/beach-30.avif'
import chair from '../assets/chair-30.avif'
import cloudy from '../assets/cloudy-30.avif'
import dog from '../assets/dog-30.avif'
import electric_circuit from '../assets/electric-circuit-30.avif'
import flower from '../assets/flower-30.avif'
import gradient_geometric_shapes from '../assets/gradient-geometric-shapes.avif'
import lake from '../assets/lake-30.avif'
import matrix from '../assets/matrix-30.avif'
import mountain from '../assets/mountain-30.avif'
import purple from '../assets/purple-30.avif'
import purple2 from '../assets/purple2-30.avif'
import { BackgroundIndex } from '../background/background_index'

export class Background {
    private readonly _background_urls: string[] = [
        beach,
        chair,
        cloudy,
        dog,
        electric_circuit,
        flower,
        gradient_geometric_shapes,
        lake,
        matrix,
        mountain,
        purple,
        purple2,
    ]

    private _background_url: string

    public constructor(private readonly _background_index: BackgroundIndex) {
        if (this._background_urls[_background_index.index] === undefined) {
            throw new Error('Invalid Background index')
        } else {
            this._background_url = this._background_urls[_background_index.index] as string
        }
    }

    public static from_local_storage(): Background {
        const saved_index = localStorage.getItem('background_index')

        if (!saved_index) {
            const new_background = new Background(new BackgroundIndex(0))

            new_background._save_to_local_storage()

            return new_background
        }

        const background_index = BackgroundIndex.from_string(saved_index)
        const background = new Background(background_index)

        return background
    }

    private _save_to_local_storage(): void {
        localStorage.setItem('background_index', this._background_index.index.toString())
    }

    public get_next_background(): Background {
        const next_index = (this._background_index.index + 1) % this._background_urls.length
        const next_background_index = new BackgroundIndex(next_index)
        const next_background = new Background(next_background_index)

        return next_background
    }

    public transition_background(): Background {
        const next_background = this.get_next_background()

        next_background._save_to_local_storage()

        return next_background
    }

    public get background_url(): string {
        return this._background_url
    }

    public get background_index(): BackgroundIndex {
        return this._background_index
    }
}