import { useState, useEffect, useRef } from "react";
import Head from "next/head";
import Image from "next/image";
import styles from "../styles/studio.module.css";
import FormData from 'form-data';
import Dropzone from 'react-dropzone';
import { userAgentFromString } from "next/server";
import TextInput from "@/components/textinput";
import { Canvas, useFrame, useThree } from '@react-three/fiber'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader';
import {CanvasComponent} from "@/components/canvascomponent";


const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

export default function Studio(){

    const [gltfModel, setGltfModel] = useState(null);
    const [isResultVisible, setIsResultVisible] = useState(null)
    const [isLoadingVisible, setIsLoadingVisible] = useState(null)
    const [prediction, setPrediction] = useState(null);
    const [error, setError] = useState(null);
    const [inputValue, setInputValue] = useState('');

    // create a canvas reference in the main state
    const [canvasRef, setCanvasRef] = useState(null);

    function handleInputValueChange(newInputValue) {
        setInputValue(newInputValue);
    }

    useEffect(() => {
        console.log("loaded the page");
        setIsResultVisible(false)
        setIsLoadingVisible(false)

    },[]);


    const handleDrop = (event) => {
        event.preventDefault();
    
        const file = event.dataTransfer.files[0];
        if (file && file.name.endsWith('.glb')) {
            const reader = new FileReader();
    
            reader.readAsArrayBuffer(file);
            reader.onload = (event) => {
                const arrayBuffer = event.target.result;
    
                const loader = new GLTFLoader();
                loader.parse(arrayBuffer, '', (gltf) => {
                    setGltfModel(gltf);
                    console.log("gltf model loaded")
                    console.log('Loaded Scene:', gltf.scene);

                }, (error) => {
                    console.error('ArrayBuffer loading error:', error);
                });
            };
        }
    };
    

    const getReplicateResults = async (image, mask) => {

        setIsLoadingVisible(true)

        let promptText = "beautiful living room"

        if (inputValue) {
            promptText = inputValue
        }

        const response = await fetch("/api/predictions", {
          method: "POST",
          headers: {
            "Content-Type": "application/json",
          },
          body: JSON.stringify({
            prompt: promptText + ", photorealistic, high resolution product photography, don't modify product",
            negative_prompt: "blurry, painting, cartoon, abstract, ugly, deformed",
            image: image,
            mask: mask,
            num_outputs: 4,
            guidance_scale: 7.5,
          }),
        });
        let prediction = await response.json();
        if (response.status !== 201) {
          setError(prediction.detail);
          return;
        }
        setPrediction(prediction);
    
        while (
          prediction.status !== "succeeded" &&
          prediction.status !== "failed"
        ) {
          await sleep(1000);
          const response = await fetch("/api/predictions/" + prediction.id);
          prediction = await response.json();
          if (response.status !== 200) {
            setError(prediction.detail);
            return;
          }

          if (prediction.status == "succeeded" && prediction.output) {

            setIsResultVisible(true)
            setIsLoadingVisible(false)
          }

          console.log({prediction})
          setPrediction(prediction);
        }
    };

    async function generateImages() {
        console.log("Called the generate images function")
    
        // Do something with the image data URL
        let snapshotImage = capture3DSnapshot()

        const formData = new FormData();
        formData.append('image', snapshotImage);
        
        if (!snapshotImage) {
            console.log("image file is null")
        }
        // Generate base64 url image for remove bg

        try {

            const response = await fetch('http://127.0.0.1:5000/get_item_mask', {
              method: 'POST',
              body: formData
            });
    
            console.log(response)
            const data = await response.json();
            let maskBase64Url = `data:image/jpeg;base64,${data.ai_mask}`

            setIsResultVisible(false)
            let imageURLTemp = "https://images.unsplash.com/photo-1490730141103-6cac27aaab94?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=2940&q=80"
            
            // Generate base64 image for input image.
            // Filereader converts a file blob into a base64 string
            const reader = new FileReader();
            reader.readAsDataURL(snapshotImage);
            reader.onload = async () => {
                const imageBase64Url = reader.result;

                // now send a request to replicate
                await getReplicateResults(imageBase64Url ,maskBase64Url)

            };
        } catch (error) {
            console.error(error);
        }
    }

    function base64ToBlob(base64Image) {
        const parts = base64Image.split(';base64,');
        const mimeType = parts[0].split(':')[1];
        const byteString = atob(parts[1]);
        const arrayBuffer = new ArrayBuffer(byteString.length);
        const uint8Array = new Uint8Array(arrayBuffer);
      
        for (let i = 0; i < byteString.length; i++) {
          uint8Array[i] = byteString.charCodeAt(i);
        }
      
        return new Blob([arrayBuffer], { type: mimeType });
    }

    function capture3DSnapshot() {
        const dataUrl = canvasRef.toDataURL("image/png")
        const blob = base64ToBlob(dataUrl);
        setIsResultVisible(false)
        return blob
    }

    //download snapshot
    const download3DSnapshot = () => {
        const link = document.createElement("a");
        link.setAttribute("download", "canvas.png");
        link.setAttribute(
          "href",
          canvasRef.toDataURL("image/png").replace("image/png", "image/octet-stream")
        );
        link.click();
    };


    return(
        <div className={styles.page}>
            <div className={styles.inputPanel}>
                <div className={styles.mainImageContainer}>
                    <div
                        className={styles.imageContainer}
                        onDrop={handleDrop}
                        onDragOver={(event) => event.preventDefault()}
                    >
                        {gltfModel ? <CanvasComponent setCanvasRef={setCanvasRef} gltfModel={gltfModel} /> : "Drop your GLB model here"}
                    </div>
                </div>

                <div><TextInput onTextChange={handleInputValueChange} /></div>

                <div className={styles.buttonContainer}>
                    <div 
                        className={styles.generateButton}
                        onClick={()=>generateImages()}
                    >
                            Generate Images
                    </div>
                </div>
            </div>

            <div className={styles.resultsPanel}>
                {isResultVisible? (
                    <>
                    <div>
                    {prediction.output && (
                        <div className={styles.imageResultsContainer}>
                            <div className={styles.imageWrapper}>
                                <Image
                                fill
                                src={prediction.output[0]}
                                alt="output"
                                />
                            </div>
                            <div className={styles.imageWrapper}>
                                <Image
                                fill
                                src={prediction.output[1]}
                                alt="output"
                                />
                            </div>
                            <div className={styles.imageWrapper}>
                                <Image
                                fill
                                src={prediction.output[2]}
                                alt="output"
                                />
                            </div>
                            <div className={styles.imageWrapper}>
                                <Image
                                fill
                                src={prediction.output[3]}
                                alt="output"
                                />
                            </div>
                        </div>
                    )}  
                    </div>
                    
                </>
                ) : (
                    <></>
                )}
                {
                    isLoadingVisible?
                    (<p>Loading...</p>):(<></>)
                }

            </div>
        </div>
    );

}