use std::fs::exists;
use pathbufd::PathBufD;
use crate::{
    get_user_from_token,
    image::{save_webp_buffer, Image},
    routes::api::v1::{auth::images::read_image, UpdateEmojiName},
    State,
};
use axum::{body::Body, extract::Path, response::IntoResponse, Extension, Json};
use axum_extra::extract::CookieJar;
use tetratto_core::model::{
    uploads::{CustomEmoji, MediaType, MediaUpload},
    ApiReturn, Error,
};

/// Expand a unicode emoji into its Gemoji shortcode.
pub async fn get_emoji_shortcode(emoji: String) -> impl IntoResponse {
    match emojis::get(&emoji) {
        Some(e) => match e.shortcode() {
            Some(s) => s.to_string(),
            None => e.name().replace(" ", "-"),
        },
        None => String::new(),
    }
}

pub async fn get_request(
    Path((community, name)): Path<(usize, String)>,
    Extension(data): Extension<State>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;

    if community == 0 {
        return Err((
            [("Content-Type", "image/svg+xml")],
            Body::from(read_image(PathBufD::current().extend(&[
                data.0.0.dirs.media.as_str(),
                "images",
                "default-avatar.svg",
            ]))),
        ));
    }

    let emoji = match data.get_emoji_by_community_name(community, &name).await {
        Ok(ua) => ua,
        Err(_) => {
            return Err((
                [("Content-Type", "image/svg+xml")],
                Body::from(read_image(PathBufD::current().extend(&[
                    data.0.0.dirs.media.as_str(),
                    "images",
                    "default-avatar.svg",
                ]))),
            ));
        }
    };

    let upload = data
        .get_upload_by_id(emoji.0.unwrap().upload_id)
        .await
        .unwrap();
    let path = upload.path(&data.0.0);

    if !exists(&path).unwrap() {
        return Err((
            [("Content-Type", "image/svg+xml")],
            Body::from(read_image(PathBufD::current().extend(&[
                data.0.0.dirs.media.as_str(),
                "images",
                "default-avatar.svg",
            ]))),
        ));
    }

    Ok((
        [("Content-Type", upload.what.mime())],
        Body::from(read_image(path)),
    ))
}

// maximum file dimensions: 512x512px (256KiB)
pub const MAXIMUM_FILE_SIZE: usize = 262144;

pub async fn create_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path((community, name)): Path<(usize, String)>,
    img: Image,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    // check file size
    if img.0.len() > MAXIMUM_FILE_SIZE {
        return Json(Error::DataTooLong("image".to_string()).into());
    }

    // make sure emoji doesn't already exist in community
    if data
        .get_emoji_by_community_name(community, &name)
        .await
        .is_ok()
    {
        return Json(
            Error::MiscError("This emoji name is already in use in this community".to_string())
                .into(),
        );
    }

    // create upload
    let upload = match data
        .create_upload(MediaUpload::new(
            if img.1 == "image/gif" {
                MediaType::Gif
            } else {
                MediaType::Webp
            },
            user.id,
        ))
        .await
    {
        Ok(u) => u,
        Err(e) => return Json(e.into()),
    };

    // create emoji
    let is_animated = img.1 == "image/gif";
    match data
        .create_emoji(CustomEmoji::new(
            user.id,
            community,
            upload.id,
            name,
            is_animated,
        ))
        .await
    {
        Ok(_) => {
            if is_animated {
                if let Err(e) = upload.write(&data.0.0, &img.0) {
                    return Json(Error::MiscError(e.to_string()).into());
                }
            } else {
                if let Err(e) =
                    save_webp_buffer(&upload.path(&data.0.0).to_string(), img.0.to_vec(), None)
                {
                    return Json(Error::MiscError(e.to_string()).into());
                }
            }

            Json(ApiReturn {
                ok: true,
                message: "Emoji created".to_string(),
                payload: (),
            })
        }
        Err(e) => {
            if let Err(e) = upload.remove(&data.0.0) {
                return Json(e.into());
            }

            Json(e.into())
        }
    }
}

pub async fn update_name_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path(id): Path<usize>,
    Json(req): Json<UpdateEmojiName>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    match data.update_emoji_name(id, &user, &req.name).await {
        Ok(_) => Json(ApiReturn {
            ok: true,
            message: "Emoji updated".to_string(),
            payload: (),
        }),
        Err(e) => Json(e.into()),
    }
}

pub async fn delete_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
    Path(id): Path<usize>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    match data.delete_emoji(id, &user).await {
        Ok(_) => Json(ApiReturn {
            ok: true,
            message: "Emoji deleted".to_string(),
            payload: (),
        }),
        Err(e) => Json(e.into()),
    }
}

pub async fn get_my_request(
    jar: CookieJar,
    Extension(data): Extension<State>,
) -> impl IntoResponse {
    let data = &(data.read().await).0;
    let user = match get_user_from_token!(jar, data) {
        Some(ua) => ua,
        None => return Json(Error::NotAllowed.into()),
    };

    match data.get_user_emojis(user.id).await {
        Ok(d) => Json(ApiReturn {
            ok: true,
            message: d.len().to_string(),
            payload: Some(d),
        }),
        Err(e) => Json(e.into()),
    }
}