import { Color, DataTexture, DoubleSide, MeshBasicMaterial, MeshStandardMaterial, RepeatWrapping, RGBFormat, Texture, TextureLoader, Vector2 } from "three"
import { useLoader, } from '@tresjs/core'
import { getFilename, patterns, } from "~/components/pattern"


const set_metaril_func = (scene: any, material: any) => {
    scene.children.forEach((el: any) => {
        if (el.isMesh) {
            el.castShadow = true
            el.receiveShadow = true
        }
        el.material = material
        set_metaril_func(el, material)
    })
}

const loaded_patterns: { [key: string]: any } = {}
for (let index = 0; index < patterns.length; index++) {
    const element = patterns[index];
    const filename = getFilename(element.id)
    if (filename) {
        loaded_patterns[filename] = useLoader(TextureLoader, filename)
    }
}
Promise.all(Object.keys(loaded_patterns))

function generateNoiseTexture(width: number, height: number) {
    const size = width * height;
    const data = new Uint8Array(4 * size);

    for (let i = 0; i < size; i++) {
        const r = Math.floor(Math.random() * 255) * 0.05;
        const g = 0;
        const b = Math.floor(Math.random() * 255) * 0.05;

        const stride = i * 4;
        data[stride] = r;
        data[stride + 1] = g;
        data[stride + 2] = b;
        data[stride + 3] = 255;
    }

    // used the buffer to create a DataTexture
    const texture = new DataTexture(data, width, height);
    texture.needsUpdate = true;
    return texture;
}

const m = new MeshStandardMaterial({
    // alphaMap: pattern ? texture : null,
    transparent: true,
    opacity: 1,
    roughness: 0.5,
    metalness: 0,
    side: DoubleSide,
})

const m_onBeforeCompile = (shader) => {
    // Добавляем uniform переменную
    shader.uniforms.customUniform = { value: 1.0 };

    // Изменяем вершинный шейдер
    shader.vertexShader = `
        uniform float customUniform;
        varying vec2 vPosition; 
        ${shader.vertexShader}
    `.replace(
        `#include <begin_vertex>`,
        `#include <begin_vertex>
        vPosition = position.xy;
        `
    );

    // Изменяем фрагментный шейдер
    shader.fragmentShader = `
        float random(float p) {
            return fract(sin(p) * 10000.0);
        }

        float noise(vec2 p) {
            return random((p.x + p.y) * 10000.0);
        }
        ${shader.fragmentShader}
    `
        // .replace(
        //     `#include <map_fragment>`,
        //     `
        //     float noise_v = noise(diffuseColor.rg);
        //     float clamped_noise = clamp(noise_v, -0.15, 0.15);
        //     diffuseColor.rgb *= clamped_noise;
        //     #include <map_fragment>
        //     `
        // )
        .replace(
            `#include <dithering_fragment>`,
            `#include <dithering_fragment>

            float noise_v = noise(gl_FragColor.rg);
            float clamped_noise = clamp(noise_v, -0.05, 0.05);
            gl_FragColor.rgb -= clamp(vec3(clamped_noise), 0.0, 1.0);
        `
        );
};
export const set_material = (scene: any, color: any, pattern: { pattern: patternTypes, count: number } | undefined = undefined) => {
    let c = color

    const material = m.clone()
    material.color = new Color(c || '#9c9c00')
    material.onBeforeCompile = m_onBeforeCompile

    const promises = []
    if (pattern && pattern.pattern !== undefined) {
        const filename = getFilename(pattern.pattern)
        if (filename) {
            const texture = loaded_patterns[filename]
            promises.push(texture)
            texture.then((res: Texture) => {
                res.wrapT = RepeatWrapping;
                res.repeat.set(1, pattern.count);
                res.needsUpdate = true
                material.alphaMap = res
                return res
            })
        }
    }

    if (scene) set_metaril_func(scene, material)
    else console.log(scene)

    Promise.all(promises).then((values) => {
        if (scene) set_metaril_func(scene, material)
        else console.log(scene)
    });
}