diff --git a/src/core/parse_mode.rs b/src/core/parse_mode.rs
deleted file mode 100644
index 3a4f7054..00000000
--- a/src/core/parse_mode.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub enum ParseMode {
-    HTML,
-    Markdown,
-}
\ No newline at end of file
diff --git a/src/core/types/input_file.rs b/src/core/types/input_file.rs
index 5475c572..0c3110f1 100644
--- a/src/core/types/input_file.rs
+++ b/src/core/types/input_file.rs
@@ -1,8 +1,25 @@
 use serde::Deserialize;
 
-#[derive(Debug, Deserialize, Hash, PartialEq, Eq)]
+#[derive(Debug, Hash, PartialEq, Eq)]
 pub enum InputFile {
-    File(std::fs::File),
+    File(std::path::PathBuf),
     Url(String),
     FileId(String),
 }
+
+impl serde::Serialize for InputFile {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: serde::Serializer {
+        match self {
+            InputFile::File(path) => {
+                // NOTE: file should be actually attached with multipart/form-data
+                serializer.serialize_str(
+                    // TODO: remove unwrap (?)
+                    &format!("attach://{}", path.file_name().unwrap().to_string_lossy())
+                )
+            },
+            InputFile::Url(url) => serializer.serialize_str(url),
+            InputFile::FileId(id) => serializer.serialize_str(id),
+        }
+    }
+
+}
diff --git a/src/core/types/input_media.rs b/src/core/types/input_media.rs
index 435fb48f..e9cdc5fd 100644
--- a/src/core/types/input_media.rs
+++ b/src/core/types/input_media.rs
@@ -1,69 +1,245 @@
 use serde::Deserialize;
-use crate::core::types::InputFile;
+use crate::core::types::{InputFile, ParseMode};
 
+// TODO: should variants use new-type?
+#[derive(Debug, Serialize, PartialEq, Eq)]
+#[serde(tag = "type")]
+#[serde(rename_all = "snake_case")]
+/// This object represents the content of a media message to be sent.
+/// [More](https://core.telegram.org/bots/api#inputmedia)
 pub enum InputMedia {
-    InputMediaPhoto(InputMediaPhoto),
-    InputMediaVideo(InputMediaVideo),
-    InputMediaAnimation(InputMediaAnimation),
-    InputMediaAudio(InputMediaAudiotype),
-    InputMediaDocument(InputMediaDocument),
+    /// Represents a photo to be sent.
+    Photo {
+        /// File to send.
+        media: InputFile,
+        /// Caption of the photo to be sent, 0-1024 characters
+        #[serde(skip_serializing_if = "Option::is_none")]
+        caption: Option<String>,
+        /// Send [Markdown] or [HTML],
+        /// if you want Telegram apps to show [bold, italic, fixed-width text or inline URLs]
+        /// in the media caption.
+        ///
+        /// [Markdown]: crate::core::types::ParseMode::Markdown
+        /// [Html]: crate::core::types::ParseMode::Html
+        /// [bold, italic, fixed-width text or inline URLs]: crate::core::types::ParseMode
+        #[serde(skip_serializing_if = "Option::is_none")]
+        parse_mode: Option<ParseMode>,
+    },
+    Video {
+        /// File to send.File to send.
+        media: InputFile,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        /// Thumbnail of the file sent; can be ignored if thumbnail generation for the file is
+        /// supported server-side.
+        /// The thumbnail should be in JPEG format and less than 200 kB in size.
+        /// A thumbnail‘s width and height should not exceed 320.
+        /// Ignored if the file is not uploaded using [InputFile::File].
+        ///
+        /// [InputFile::File]: crate::core::types::InputFile::File
+        thumb: Option<InputFile>,
+        /// Caption of the video to be sent, 0-1024 characters.
+        #[serde(skip_serializing_if = "Option::is_none")]
+        caption: Option<String>,
+        /// Send [Markdown] or [HTML],
+        /// if you want Telegram apps to show [bold, italic, fixed-width text or inline URLs]
+        /// in the media caption.
+        ///
+        /// [Markdown]: crate::core::types::ParseMode::Markdown
+        /// [Html]: crate::core::types::ParseMode::Html
+        /// [bold, italic, fixed-width text or inline URLs]: crate::core::types::ParseMode
+        #[serde(skip_serializing_if = "Option::is_none")]
+        parse_mode: Option<ParseMode>,
+        /// Video width
+        #[serde(skip_serializing_if = "Option::is_none")]
+        width: Option<u16>,
+        /// Video height
+        #[serde(skip_serializing_if = "Option::is_none")]
+        height: Option<u16>,
+        /// Video duration
+        #[serde(skip_serializing_if = "Option::is_none")]
+        duration: Option<u16>,
+        /// Pass `true`, if the uploaded video is suitable for streaming
+        #[serde(skip_serializing_if = "Option::is_none")]
+        supports_streaming: Option<bool>,
+    },
+    /// Represents an animation file (GIF or H.264/MPEG-4 AVC video without sound) to be sent.
+    Animation {
+        /// File to send.
+        media: InputFile,
+        /// Thumbnail of the file sent; can be ignored if thumbnail generation for the file is
+        /// supported server-side.
+        /// The thumbnail should be in JPEG format and less than 200 kB in size.
+        /// A thumbnail‘s width and height should not exceed 320.
+        /// Ignored if the file is not uploaded using [InputFile::File].
+        ///
+        /// [InputFile::File]: crate::core::types::InputFile::File
+        #[serde(skip_serializing_if = "Option::is_none")]
+        thumb: Option<InputFile>,
+        /// Caption of the animation to be sent, 0-1024 characters
+        #[serde(skip_serializing_if = "Option::is_none")]
+        caption: Option<String>,
+        /// Send [Markdown] or [HTML],
+        /// if you want Telegram apps to show [bold, italic, fixed-width text or inline URLs]
+        /// in the media caption.
+        ///
+        /// [Markdown]: crate::core::types::ParseMode::Markdown
+        /// [Html]: crate::core::types::ParseMode::Html
+        /// [bold, italic, fixed-width text or inline URLs]: crate::core::types::ParseMode
+        #[serde(skip_serializing_if = "Option::is_none")]
+        parse_mode: Option<ParseMode>,
+        /// Animation width
+        #[serde(skip_serializing_if = "Option::is_none")]
+        width: Option<u16>,
+        /// Animation height
+        #[serde(skip_serializing_if = "Option::is_none")]
+        height: Option<u16>,
+        /// Animation duration
+        #[serde(skip_serializing_if = "Option::is_none")]
+        duration: Option<u16>,
+    },
+    /// Represents an audio file to be treated as music to be sent.
+    Audio {
+        /// File to send,
+        media: InputFile,
+        /// Thumbnail of the file sent; can be ignored if thumbnail generation for the file is
+        /// supported server-side.
+        /// The thumbnail should be in JPEG format and less than 200 kB in size.
+        /// A thumbnail‘s width and height should not exceed 320.
+        /// Ignored if the file is not uploaded using [InputFile::File].
+        ///
+        /// [InputFile::File]: crate::core::types::InputFile::File
+        #[serde(skip_serializing_if = "Option::is_none")]
+        thumb: Option<InputFile>,
+        /// Caption of the audio to be sent, 0-1024 characters
+        #[serde(skip_serializing_if = "Option::is_none")]
+        caption: Option<String>,
+        /// Send [Markdown] or [HTML],
+        /// if you want Telegram apps to show [bold, italic, fixed-width text or inline URLs]
+        /// in the media caption.
+        ///
+        /// [Markdown]: crate::core::types::ParseMode::Markdown
+        /// [Html]: crate::core::types::ParseMode::Html
+        /// [bold, italic, fixed-width text or inline URLs]: crate::core::types::ParseMode
+        #[serde(skip_serializing_if = "Option::is_none")]
+        parse_mode: Option<String>,
+        /// Duration of the audio in seconds
+        #[serde(skip_serializing_if = "Option::is_none")]
+        duration: Option<u16>,
+        /// Performer of the audio
+        #[serde(skip_serializing_if = "Option::is_none")]
+        performer: Option<String>,
+        /// Title of the audio
+        #[serde(skip_serializing_if = "Option::is_none")]
+        title: Option<String>
+    },
+    /// Represents a general file to be sent.
+    Document {
+        /// File to send.
+        media: InputFile,
+        /// Thumbnail of the file sent; can be ignored if thumbnail generation for the file is
+        /// supported server-side.
+        /// The thumbnail should be in JPEG format and less than 200 kB in size.
+        /// A thumbnail‘s width and height should not exceed 320.
+        /// Ignored if the file is not uploaded using [InputFile::File].
+        ///
+        /// [InputFile::File]: crate::core::types::InputFile::File
+        #[serde(skip_serializing_if = "Option::is_none")]
+        thumb: Option<InputFile>,
+        /// Caption of the document to be sent, 0-1024 characters
+        #[serde(skip_serializing_if = "Option::is_none")]
+        caption: Option<String>,
+        /// Send [Markdown] or [HTML],
+        /// if you want Telegram apps to show [bold, italic, fixed-width text or inline URLs]
+        /// in the media caption.
+        ///
+        /// [Markdown]: crate::core::types::ParseMode::Markdown
+        /// [Html]: crate::core::types::ParseMode::Html
+        /// [bold, italic, fixed-width text or inline URLs]: crate::core::types::ParseMode
+        #[serde(skip_serializing_if = "Option::is_none")]
+        parse_mode: Option<ParseMode>,
+    },
 }
 
-pub enum ThumbKind {
-    InputFile,
-    String,
-}
+#[cfg(test)]
+mod tests {
+    use super::*;
 
-#[derive(Debug, Serialize, Deserialize)]
-pub struct  InputMediaPhoto {
-    type_: String,
-    media: String,
-    caption: Option<String>,
-    parse_mode: Option<String>,
-}
+    #[test]
+    fn photo_serialize() {
+        let expected_json = r#"{"type":"photo","media":"123456"}"#;
+        let photo = InputMedia::Photo {
+            media: InputFile::FileId(String::from("123456")),
+            caption: None,
+            parse_mode: None,
+        };
 
-#[derive(Debug, Serialize), Deserialize]
-pub struct InputMediaVideo {
-    type_: String,
-    media: String,
-    thumb: ThumbKind,
-    caption: Option<String>,
-    parse_mode: Option<String>,
-    width: Option<i64>,
-    height: Option<i64>,
-    duration: Option<i64>,
-    supports_streaming: Option<bool>,
-}
+        let actual_json = serde_json::to_string(&photo).unwrap();
+        assert_eq!(expected_json, actual_json);
+    }
 
-#[derive(Debug, Serialize, Deserialize)]
-pub struct InputMediaAnimation {
-    type_: String,
-    media: String,
-    thumb: Option<ThumbKind>,
-    caption: Option<String>,
-    parse_mode: Option<String>,
-    width: Option<i64>,
-    height: Option<i64>,
-    duration: Option<i64>,
-}
+    #[test]
+    fn video_serialize() {
+        let expected_json = r#"{"type":"video","media":"123456"}"#;
+        let video = InputMedia::Video {
+            media: InputFile::FileId(String::from("123456")),
+            thumb: None,
+            caption: None,
+            parse_mode: None,
+            width: None,
+            height: None,
+            duration: None,
+            supports_streaming: None,
+        };
 
-#[derive(Debug, Serialize, Deserialize)]
-pub struct InputMediaAudio {
-    type_: String,
-    media: String,
-    thumb: Option<ThumbKind>,
-    caption: Option<String>,
-    parse_mode: Option<String>,
-    duration: Option<i64>,
-    performer: Option<i64>,
-    title: Option<String>
-}
+        let actual_json = serde_json::to_string(&video).unwrap();
+        assert_eq!(expected_json, actual_json);
+    }
 
-#[derive(Debug, Serialize, Deserialize)]
-pub struct InputMediaDocument {
-    type_: String,
-    media: String,
-    thumb: Option<ThumbKind>,
-    caption: Option<String>,
-    parse_mode: parse_mode,
-}
\ No newline at end of file
+    #[test]
+    fn animation_serialize() {
+        let expected_json = r#"{"type":"animation","media":"123456"}"#;
+        let video = InputMedia::Animation {
+            media: InputFile::FileId(String::from("123456")),
+            thumb: None,
+            caption: None,
+            parse_mode: None,
+            width: None,
+            height: None,
+            duration: None,
+        };
+
+        let actual_json = serde_json::to_string(&video).unwrap();
+        assert_eq!(expected_json, actual_json);
+    }
+
+    #[test]
+    fn audio_serialize() {
+        let expected_json = r#"{"type":"audio","media":"123456"}"#;
+        let video = InputMedia::Audio {
+            media: InputFile::FileId(String::from("123456")),
+            thumb: None,
+            caption: None,
+            parse_mode: None,
+            duration: None,
+            performer: None,
+            title: None
+        };
+
+        let actual_json = serde_json::to_string(&video).unwrap();
+        assert_eq!(expected_json, actual_json);
+    }
+
+    #[test]
+    fn document_serialize() {
+        let expected_json = r#"{"type":"document","media":"123456"}"#;
+        let video = InputMedia::Document {
+            media: InputFile::FileId(String::from("123456")),
+            thumb: None,
+            caption: None,
+            parse_mode: None,
+        };
+
+        let actual_json = serde_json::to_string(&video).unwrap();
+        assert_eq!(expected_json, actual_json);
+    }
+}
diff --git a/src/core/types/mod.rs b/src/core/types/mod.rs
index 3d815491..568022a3 100644
--- a/src/core/types/mod.rs
+++ b/src/core/types/mod.rs
@@ -22,6 +22,9 @@ pub use self::{
     sticker::Sticker,
     successful_payment::SuccessfulPayment,
     user::User,
+    input_file::InputFile,
+    input_media::InputMedia,
+    parse_mode::ParseMode,
 };
 
 mod answer_pre_checkout_query;
@@ -43,3 +46,6 @@ mod shipping_query;
 mod sticker;
 mod successful_payment;
 mod user;
+mod input_file;
+mod input_media;
+mod parse_mode;
diff --git a/src/core/types/parse_mode.rs b/src/core/types/parse_mode.rs
new file mode 100644
index 00000000..5c885cfe
--- /dev/null
+++ b/src/core/types/parse_mode.rs
@@ -0,0 +1,63 @@
+use serde::{Serialize, Deserialize};
+
+#[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
+/// ## Formatting options
+/// The Bot API supports basic formatting for messages.
+/// You can use **bold** and *italic* text, as well as [inline links](https://example.com) and `pre-formatted code` in
+/// your bots' messages. Telegram clients will render them accordingly. You can use either
+/// markdown-style or HTML-style formatting.
+///
+/// Note that Telegram clients will display an alert to the user before opening an inline link
+/// (‘Open this link?’ together with the full URL).
+///
+/// Links `tg://user?id=<user_id>` can be used to mention a user by their id without using a username.
+/// Please note:
+///
+/// - These links will work only if they are used inside an inline link.
+///   For example, they will not work, when used in an inline keyboard button or in a message text.
+/// - The mentions are only guaranteed to work if: **A**. the user is a member in the group where he
+///   was mentioned or **B**. the user has contacted the bot in the past or has sent a callback
+///   query to the bot via inline button and has not restricted linking to their account in
+///   `Settings > Privacy & Security > Forwarded Messages`.
+///
+/// ## Markdown style
+/// To use this mode, pass [Markdown] in the `parse_mode` field when using [SendMessage] (or other methods).
+///
+/// Use the following syntax in your message:
+///
+/// ```ignore
+/// *bold text*
+/// _italic text_
+/// [inline URL](http://www.example.com/)
+/// [inline mention of a user](tg://user?id=123456789)
+/// `inline fixed-width code`
+/// &#96;&#96;&#96;block_language
+/// pre-formatted fixed-width code block
+/// &#96;&#96;&#96;
+/// ```
+///
+/// ## HTML style
+/// To use this mode, pass [HTML] in the `parse_mode` field when using [SendMessage] (or other methods).
+///
+/// The following tags are currently supported:
+///
+/// ```ignore
+/// <b>bold</b>, <strong>bold</strong>
+/// <i>italic</i>, <em>italic</em>
+/// <a href="http://www.example.com/">inline URL</a>
+/// <a href="tg://user?id=123456789">inline mention of a user</a>
+/// <code>inline fixed-width code</code>
+/// <pre>pre-formatted fixed-width code block</pre>
+/// ```
+///
+/// Please note:
+///
+/// - Only the tags mentioned above are currently supported.
+/// - Tags must not be nested.
+/// - All `<`, `>` and `&` symbols that are not a part of a tag or an HTML entity must be replaced with the corresponding HTML entities (`<` with `&lt;`, `>` with `&gt;` and `&` with `&amp;`).
+/// - All numerical HTML entities are supported.
+/// - The API currently supports only the following named HTML entities: `&lt;`, `&gt;`, `&amp;` and `&quot;`.
+pub enum ParseMode {
+    HTML,
+    Markdown,
+}
\ No newline at end of file