// Copyright 2020 - developers of the `grammers` project.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::path::Path;

use tokio::fs;
use tokio::io::AsyncWriteExt;

use grammers_tl_types as tl;

use crate::Client;

pub enum PhotoSize {
    Empty(SizeEmpty),
    Size(Size),
    Cached(CachedSize),
    Stripped(StrippedSize),
    Progressive(ProgressiveSize),
    Path(PathSize),
}

impl PhotoSize {
    pub(crate) fn make_from(
        size: &tl::enums::PhotoSize,
        photo: &tl::types::Photo,
        client: Client,
    ) -> Self {
        match size {
            tl::enums::PhotoSize::Empty(size) => PhotoSize::Empty(SizeEmpty {
                photo_type: size.r#type.clone(),
            }),
            tl::enums::PhotoSize::Size(size) => PhotoSize::Size(Size {
                photo_type: size.r#type.clone(),
                width: size.w,
                height: size.h,
                size: size.size,
                id: photo.id,
                access_hash: photo.access_hash,
                file_reference: photo.file_reference.clone(),
                client,
            }),
            tl::enums::PhotoSize::PhotoCachedSize(size) => PhotoSize::Cached(CachedSize {
                photo_type: size.r#type.clone(),
                width: size.w,
                height: size.h,
                bytes: size.bytes.clone(),
            }),
            tl::enums::PhotoSize::PhotoStrippedSize(size) => PhotoSize::Stripped(StrippedSize {
                photo_type: size.r#type.clone(),
                bytes: size.bytes.clone(),
            }),
            tl::enums::PhotoSize::Progressive(size) => PhotoSize::Progressive(ProgressiveSize {
                photo_type: size.r#type.clone(),
                width: size.w,
                height: size.h,
                sizes: size.sizes.clone(),
            }),
            tl::enums::PhotoSize::PhotoPathSize(size) => PhotoSize::Path(PathSize {
                photo_type: size.r#type.clone(),
                bytes: size.bytes.clone(),
            }),
        }
    }

    /// Size of the photo thumb
    pub fn size(&self) -> usize {
        match self {
            PhotoSize::Empty(_) => 0,
            PhotoSize::Size(size) => size.size as usize,
            PhotoSize::Cached(size) => size.bytes.len(),
            PhotoSize::Stripped(size) => {
                let bytes = &size.bytes;
                if bytes.len() < 3 || bytes[0] != 0x01 {
                    return 0;
                }
                size.bytes.len() + 622
            }
            PhotoSize::Progressive(size) => size.sizes.iter().sum::<i32>() as usize,
            PhotoSize::Path(size) => size.bytes.len(),
        }
    }

    /// Download the photo thumb into the defined location
    ///
    /// # Examples
    /// ```
    /// # use grammers_client::types::Message;
    /// use grammers_client::types::photo_sizes::VecExt;
    /// async fn load_photo(mut message: Message) {
    ///   let location = "/home/username/photos/best_photo.jpg";
    ///   message.photo().unwrap().thumbs().largest().unwrap().download(location).await;
    /// }
    /// ```
    pub async fn download<P: AsRef<Path>>(&self, path: P) {
        match self {
            PhotoSize::Empty(_) => {
                fs::File::create(path).await.unwrap();
            }
            PhotoSize::Size(size) => {
                let input_location = tl::types::InputPhotoFileLocation {
                    id: size.id,
                    access_hash: size.access_hash,
                    file_reference: size.file_reference.clone(),
                    thumb_size: size.photo_type.clone(),
                };
                size.client
                    .clone()
                    .download_media_at_location(input_location.into(), path)
                    .await
                    .unwrap();
            }
            PhotoSize::Cached(size) => {
                let mut file = fs::File::create(path).await.unwrap();
                file.write_all(&size.bytes).await.unwrap();
            }
            PhotoSize::Stripped(size) => {
                // Based on https://core.tlgr.org/api/files#stripped-thumbnails
                let bytes = &size.bytes;
                if bytes.len() < 3 || bytes[0] != 0x01 {
                    return;
                }

                let header = vec![
                    0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01, 0x01,
                    0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0xff, 0xdb, 0x00, 0x43, 0x00, 0x28,
                    0x1c, 0x1e, 0x23, 0x1e, 0x19, 0x28, 0x23, 0x21, 0x23, 0x2d, 0x2b, 0x28, 0x30,
                    0x3c, 0x64, 0x41, 0x3c, 0x37, 0x37, 0x3c, 0x7b, 0x58, 0x5d, 0x49, 0x64, 0x91,
                    0x80, 0x99, 0x96, 0x8f, 0x80, 0x8c, 0x8a, 0xa0, 0xb4, 0xe6, 0xc3, 0xa0, 0xaa,
                    0xda, 0xad, 0x8a, 0x8c, 0xc8, 0xff, 0xcb, 0xda, 0xee, 0xf5, 0xff, 0xff, 0xff,
                    0x9b, 0xc1, 0xff, 0xff, 0xff, 0xfa, 0xff, 0xe6, 0xfd, 0xff, 0xf8, 0xff, 0xdb,
                    0x00, 0x43, 0x01, 0x2b, 0x2d, 0x2d, 0x3c, 0x35, 0x3c, 0x76, 0x41, 0x41, 0x76,
                    0xf8, 0xa5, 0x8c, 0xa5, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8,
                    0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8,
                    0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8,
                    0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8, 0xf8,
                    0xf8, 0xf8, 0xff, 0xc0, 0x00, 0x11, 0x08, 0x00, 0x00, 0x00, 0x00, 0x03, 0x01,
                    0x22, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01, 0xff, 0xc4, 0x00, 0x1f, 0x00,
                    0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00,
                    0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
                    0x0a, 0x0b, 0xff, 0xc4, 0x00, 0xb5, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03, 0x02,
                    0x04, 0x03, 0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7d, 0x01, 0x02, 0x03,
                    0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
                    0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1, 0xc1, 0x15,
                    0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, 0x17, 0x18,
                    0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38,
                    0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55,
                    0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
                    0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87,
                    0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2,
                    0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
                    0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca,
                    0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 0xe3, 0xe4,
                    0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
                    0xf8, 0xf9, 0xfa, 0xff, 0xc4, 0x00, 0x1f, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01,
                    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
                    0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0xff, 0xc4, 0x00,
                    0xb5, 0x11, 0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04, 0x07, 0x05, 0x04,
                    0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
                    0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08,
                    0x14, 0x42, 0x91, 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62,
                    0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a,
                    0x26, 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44,
                    0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
                    0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
                    0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a,
                    0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
                    0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9,
                    0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
                    0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8,
                    0xe9, 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xff, 0xda,
                    0x00, 0x0c, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00,
                ];
                let mut footer = vec![0xff, 0xd9];
                let mut real = header;
                real[164] = bytes[1];
                real[166] = bytes[2];

                let mut bytes_clone = bytes.clone()[3..].to_vec();
                real.append(&mut bytes_clone);
                real.append(&mut footer);

                let mut file = fs::File::create(path).await.unwrap();
                file.write_all(&real).await.unwrap();
            }
            PhotoSize::Progressive(_) => {
                // Nothing
            }
            PhotoSize::Path(size) => {
                // Based on https://core.tlgr.org/api/files#vector-thumbnails
                let lookup = "AACAAAAHAAALMAAAQASTAVAAAZaacaaaahaaalmaaaqastava.az0123456789-,";
                let mut path = String::from("M");
                for num in &size.bytes {
                    let num = *num;
                    if num >= 128 + 64 {
                        path.push(lookup.chars().nth((num - 128 - 64) as usize).unwrap());
                    } else {
                        if num >= 128 {
                            path.push(',');
                        } else if num >= 64 {
                            path.push('-');
                        }
                        path.push((num & 63) as char);
                    }
                }
                path.push('z');
                let res = format!(
                    r###"<?xml version="1.0" encoding="utf-8"?>
  <svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
     viewBox="0 0 512 512" xml:space="preserve">
  <path d="{}"/>
</svg>"###,
                    path
                );
                let mut file = fs::File::create(path).await.unwrap();
                file.write_all(res.as_bytes()).await.unwrap();
            }
        };
    }

    pub fn photo_type(&self) -> String {
        match self {
            PhotoSize::Empty(size) => size.photo_type.clone(),
            PhotoSize::Size(size) => size.photo_type.clone(),
            PhotoSize::Cached(size) => size.photo_type.clone(),
            PhotoSize::Stripped(size) => size.photo_type.clone(),
            PhotoSize::Progressive(size) => size.photo_type.clone(),
            PhotoSize::Path(size) => size.photo_type.clone(),
        }
    }
}

/// Empty thumbnail. Image with this thumbnail is unavailable.
pub struct SizeEmpty {
    photo_type: String,
}

/// Image description. An additional request to Telegram should be perfomed to download the image
pub struct Size {
    photo_type: String,
    pub width: i32,
    pub height: i32,
    pub size: i32,

    id: i64,
    access_hash: i64,
    file_reference: Vec<u8>,

    client: Client,
}

/// Description of an image and its content.
pub struct CachedSize {
    photo_type: String,

    pub width: i32,
    pub height: i32,
    pub bytes: Vec<u8>,
}

/// A low-resolution compressed JPG payload
pub struct StrippedSize {
    photo_type: String,

    pub bytes: Vec<u8>,
}

/// Progressively encoded photosize
pub struct ProgressiveSize {
    photo_type: String,

    pub width: i32,
    pub height: i32,
    pub sizes: Vec<i32>,
}

/// Messages with animated stickers can have a compressed svg (< 300 bytes) to show the outline
/// of the sticker before fetching the actual lottie animation.
pub struct PathSize {
    photo_type: String,

    pub bytes: Vec<u8>,
}

pub trait VecExt {
    /// Helper method to get the largest photo thumb
    fn largest(&self) -> Option<&PhotoSize>;
}

impl VecExt for Vec<PhotoSize> {
    fn largest(&self) -> Option<&PhotoSize> {
        self.iter().max_by_key(|x| x.size())
    }
}