//! [GET /_matrix/media/r0/thumbnail/{serverName}/{mediaId}](https://matrix.org/docs/spec/client_server/r0.6.0#get-matrix-media-r0-thumbnail-servername-mediaid)

use js_int::UInt;
use ruma_api::ruma_api;
use ruma_identifiers::ServerName;
use serde::{Deserialize, Serialize};

/// The desired resizing method.
#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
#[serde(rename_all = "snake_case")]
pub enum Method {
    /// Crop the original to produce the requested image dimensions.
    Crop,

    /// Maintain the original aspect ratio of the source image.
    Scale,
}

ruma_api! {
    metadata: {
        description: "Get a thumbnail of content from the media store.",
        method: GET,
        name: "get_content_thumbnail",
        path: "/_matrix/media/r0/thumbnail/:server_name/:media_id",
        rate_limited: true,
        requires_authentication: false,
    }

    request: {
        /// The media ID from the mxc:// URI (the path component).
        #[ruma_api(path)]
        pub media_id: &'a str,

        /// The server name from the mxc:// URI (the authoritory component).
        #[ruma_api(path)]
        pub server_name: &'a ServerName,

        /// The desired resizing method.
        #[ruma_api(query)]
        #[serde(skip_serializing_if = "Option::is_none")]
        pub method: Option<Method>,

        /// The *desired* width of the thumbnail. The actual thumbnail may not match the size
        /// specified.
        #[ruma_api(query)]
        pub width: UInt,

        /// The *desired* height of the thumbnail. The actual thumbnail may not match the size
        /// specified.
        #[ruma_api(query)]
        pub height: UInt,

        /// Whether to fetch media deemed remote.
        ///
        /// Used to prevent routing loops. Defaults to `true`.
        #[ruma_api(query)]
        #[serde(default = "ruma_serde::default_true", skip_serializing_if = "ruma_serde::is_true")]
        pub allow_remote: bool,
    }

    response: {
        /// The content type of the thumbnail.
        #[ruma_api(header = CONTENT_TYPE)]
        pub content_type: String,

        /// A thumbnail of the requested content.
        #[ruma_api(raw_body)]
        pub file: Vec<u8>,
    }

    error: crate::Error
}

impl<'a> Request<'a> {
    /// Creates a new `Request` with the given media ID, server name, desired thumbnail width and
    /// desired thumbnail height.
    pub fn new(media_id: &'a str, server_name: &'a ServerName, width: UInt, height: UInt) -> Self {
        Self { media_id, server_name, method: None, width, height, allow_remote: true }
    }
}

impl Response {
    /// Creates a new `Response` with the given content type and thumbnail.
    pub fn new(content_type: String, file: Vec<u8>) -> Self {
        Self { content_type, file }
    }
}