use std::io::Cursor;

use super::BasePage;
use crate::gallery::Grid;
use crate::hooks::use_user_context;
use gloo_net::http::Request;

use js_sys::{Array, ArrayBuffer, Promise};
use serde::{Deserialize, Serialize};
use wasm_bindgen::{prelude::wasm_bindgen, JsCast, JsValue};
use web_sys::{
    DataTransferItemList, Element, File, FileReader, FileSystemDirectoryEntry, FileSystemEntry,
    HtmlElement,
};
use weblog::console_log;
use yew::prelude::*;
use yew_hooks::prelude::*;

use common::OutputPicture;

pub struct MetaData {
    width: u32,
    height: u32,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct PhotosWrapper {
    photos: Vec<String>,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct PhotosUrlsWrapper {
    photos: Vec<(String, String)>,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct DetailPhoto {
    key: String,
    width: u32,
    height: u32,
}
#[derive(Debug, Deserialize, Serialize)]
pub struct DetailPhotoWrapper {
    photos: Vec<DetailPhoto>,
}

#[function_component(Home)]
pub fn home() -> Html {
    let user_ctx = use_user_context();

    let node = use_node_ref();
    let size = use_size(node.clone());

    let pictures = use_state(std::vec::Vec::new);

    {
        let pictures = pictures.clone();
        use_effect_with_deps(
            move |_| {
                wasm_bindgen_futures::spawn_local(async move {
                    let url = "/api/photos/get";
                    let fetched_pictures: Vec<OutputPicture> = Request::get(url)
                        .send()
                        .await
                        .unwrap()
                        .json()
                        .await
                        .unwrap();
                    pictures.set(fetched_pictures);
                });
                || ()
            },
            (),
        );
    }

    let drag_node = node.clone();
    let ondrop = Callback::from(move |e: DragEvent| {
        e.prevent_default();
        if let Some(element) = drag_node.cast::<HtmlElement>() {
            element.class_list().remove_1("dragover_highlight").unwrap();
        }

        let items = e.data_transfer().unwrap().items();
        wasm_bindgen_futures::spawn_local(async move {
            let promise = get_files_data_transfer_items(items);
            let result = wasm_bindgen_futures::JsFuture::from(promise).await.unwrap();

            console_log!(&result);

            let traverse = |d: JsValue| {
                let mut new_files: Vec<JsValue> = Vec::new();
                let mut files: Vec<File> = Vec::new();

                if let Ok(fse) = d.clone().dyn_into::<File>() {
                    console_log!(&fse);
                    files.push(fse.clone());
                } else if let Ok(a) = d.clone().dyn_into::<js_sys::Array>() {
                    for i in 0..a.length() {
                        let f = a.get(i);
                        new_files.push(f);
                    }
                } else if let Ok(o) = d.clone().dyn_into::<js_sys::Object>() {
                    if let Ok(subfolder) = js_sys::Reflect::get(&o, &JsValue::from_str("subfolder"))
                    {
                        new_files.push(subfolder);
                    }
                }
                (new_files, files)
            };

            let mut files: Vec<File> = Vec::new();
            let mut new_files = vec![result];

            loop {
                console_log!(files.len());
                let Some(current) = new_files.pop() else {
                    console_log!("break");
                    break;
                };

                let (news, fs) = traverse(current);
                news.iter().for_each(|x| new_files.push(x.clone()));
                fs.iter().for_each(|x| files.push(x.clone()));
            }

            let uiae: Vec<String> = files
                .iter()
                .map(|x| {
                    if let Ok(filepath) = js_sys::Reflect::get(x, &JsValue::from_str("filepath")) {
                        filepath.as_string().unwrap_or("".to_string())
                    } else {
                        "".to_string()
                    }
                })
                .collect();
            console_log!("end", uiae.join("\n"));

            let photos: PhotosUrlsWrapper = Request::post("/api/photos/upload")
                .json(&PhotosWrapper {
                    photos: uiae.clone(),
                })
                .unwrap()
                .send()
                .await
                .unwrap()
                .json()
                .await
                .unwrap();
            console_log!("{}", serde_json::to_string(&photos).unwrap());

            let mut metadata: Vec<MetaData> = Vec::new();
            let mut promises: Vec<Promise> = Vec::new();
            for (file, (key, url)) in files.iter().zip(photos.photos) {
                console_log!("uploading: ", &file.name(), &url);
                let promise = read_file(file.clone());
                if let Ok(content) = wasm_bindgen_futures::JsFuture::from(promise).await {
                    let buffer: ArrayBuffer = content.dyn_into().unwrap();
                    let typed_buffer: js_sys::Uint8Array = js_sys::Uint8Array::new(&buffer);
                    let mut buf = vec![0; typed_buffer.length() as usize];
                    typed_buffer.copy_to(&mut buf);
                    // console_log!(
                    //     serde_json::to_string(&buf.len()).unwrap(),
                    //     serde_json::to_string(&buf).unwrap()
                    // );
                    let mut md = MetaData {
                        width: 0,
                        height: 0,
                    };
                    let meta = image_meta::load_from_buf(&buf).unwrap();
                    console_log!(format!(
                        "dims: {}x{}",
                        meta.dimensions.width, meta.dimensions.height
                    ));
                    console_log!(format!("animation: {:?}", meta.is_animation()));
                    console_log!(format!("format: {:?}", meta.format));
                    md.height = meta.dimensions.height;
                    md.width = meta.dimensions.width;

                    let exifreader = exif::Reader::new();
                    let mut cursor = Cursor::new(&buf);
                    if let Ok(exif) = exifreader.read_from_container(&mut cursor) {
                        for f in exif.fields() {
                            console_log!(format!(
                                "{} {} {}",
                                f.tag,
                                f.ifd_num,
                                f.display_value().with_unit(&exif)
                            ));
                        }
                    }
                    metadata.push(md);

                    promises.push(upload(buffer, file.type_(), url.clone()));
                }
            }

            for promise in promises {
                match wasm_bindgen_futures::JsFuture::from(promise).await {
                    Ok(result) => console_log!(result),
                    Err(e) => console_log!("errooooor", e),
                };
            }

            let photos: DetailPhotoWrapper = Request::post("/api/photos/upload/done")
                .json(&DetailPhotoWrapper {
                    photos: uiae
                        .iter()
                        .zip(metadata)
                        .map(|(p, md)| DetailPhoto {
                            key: p.clone(),
                            width: md.width,
                            height: md.height,
                        })
                        .collect(),
                })
                .unwrap()
                .send()
                .await
                .unwrap()
                .json()
                .await
                .unwrap();
            console_log!("all uploaded");
        });
    });

    let drag_node = node.clone();
    let ondragenter = Callback::from(move |e: DragEvent| {
        e.prevent_default();
        // e.data_transfer().unwrap().set_drop_effect("move");
        if let Some(element) = drag_node.cast::<HtmlElement>() {
            element.class_list().remove_1("dragover_highlight").unwrap();
        }
    });

    let drag_node = node.clone();
    let ondragleave = Callback::from(move |e: DragEvent| {
        e.prevent_default();
        if let Some(element) = drag_node.cast::<HtmlElement>() {
            element.class_list().remove_1("dragover_highlight").unwrap();
        }
    });

    let drag_node = node.clone();
    let ondragover = Callback::from(move |e: DragEvent| {
        e.prevent_default();
        if let Some(element) = drag_node.cast::<HtmlElement>() {
            element.class_list().add_1("dragover_highlight").unwrap();
        }
    });

    let body = if user_ctx.is_authenticated() {
        html! {
            <Grid
                pictures={(*pictures).clone()}
                width={size.0}
            />
        }
    } else {
        html! {}
    };
    html! {
        <BasePage>
            <div ref={node} {ondrop} {ondragenter} {ondragleave} {ondragover}>
                {body}
            </div>
        </BasePage>
    }
}

#[wasm_bindgen(module = "/src/components/home.js")]
extern "C" {
    fn get_files_data_transfer_items(data_transfer_items: DataTransferItemList) -> js_sys::Promise;
    fn read_file(file: File) -> js_sys::Promise;
    fn upload(content: ArrayBuffer, content_type: String, url: String) -> js_sys::Promise;
}