use serde::Deserialize;
type PostId = String;
type UserId = String;

#[derive(Deserialize, Debug, PartialEq, Eq)]
#[serde(untagged)]
pub enum WebsocketMessage {
    Update(WebsocketUpdate),
    Reply(WebsocketReply),
}
#[derive(Deserialize, Debug, PartialEq, Eq)]
pub struct WebsocketReply {
    pub status: String,
    pub seq_reply: u32,
}
#[derive(Deserialize, Debug, PartialEq, Eq)]
pub struct Broadcast {
    pub channel_id: String,
    pub connection_id: String,
    pub omit_connection_id: String,
    // omit_users:
    pub team_id: String,
    pub user_id: String,
}
#[derive(Deserialize, Debug, PartialEq, Eq)]
pub struct WebsocketUpdateStuff {
    pub broadcast: Broadcast,
    pub seq: u32,
}
#[derive(Deserialize, Debug, PartialEq, Eq)]
pub struct WebsocketUpdate {
    #[serde(flatten)]
    pub stuff: WebsocketUpdateStuff,
    #[serde(flatten)]
    pub update: Update,
}
#[derive(Deserialize, Debug, PartialEq, Eq)]
#[serde(tag = "event", content = "data")]
pub enum Update {
    #[serde(rename = "posted")]
    Posted(Posted),
    #[serde(rename = "hello")]
    Hello(Hello),
    #[serde(rename = "status_change")]
    StatusChange {},
    #[serde(rename = "typing")]
    Typing {},
    #[serde(rename = "channel_viewed")]
    ChannelViewed {},
    #[serde(other)]
    Other,
}

#[derive(Deserialize, Debug, PartialEq, Eq)]
pub struct Posted {
    pub channel_display_name: String,
    pub channel_name: String,
    pub channel_type: String,
    #[serde(deserialize_with = "deserialize_json_field", default)]
    pub mentions: Vec<String>,
    #[serde(deserialize_with = "deserialize_json_field")]
    pub post: Post,
}
fn deserialize_json_field<'de, D, T>(deserializer: D) -> Result<T, D::Error>
where
    D: serde::Deserializer<'de>,
    T: serde::de::DeserializeOwned,
{
    let buf: String = String::deserialize(deserializer)?;
    serde_json::from_str(&buf).map_err(|x| {
        serde::de::Error::custom(format!("Error while deserializing json encoded field {x}"))
    })
}

#[derive(Deserialize, Debug, PartialEq, Eq)]
pub struct Post {
    pub id: String,
    pub create_at: u64,
    pub update_at: u64,
    pub edit_at: u64,
    pub delete_at: u64,
    pub is_pinned: bool,
    pub user_id: String,
    pub channel_id: String,
    // pub hashtags: String,
    // pub last_reply_at: u64,
    pub message: String,
    // pub metadata:,
    // pub original_id: String,
    // pub participants:,
    // pub pending_post_id: String,
    // pub preops
    // pub reply_count: u64,
    pub root_id: String,
    #[serde(rename = "type")]
    pub ttype: String,
}

#[derive(Deserialize, Debug, PartialEq, Eq)]
pub struct Hello {
    pub connection_id: String,
    pub server_version: String,
}
#[cfg(test)]
mod tests {
    use serde_json::Value;

    use crate::mattermost::model::{
        Broadcast, Post, Update, WebsocketUpdate, WebsocketUpdateStuff,
    };
    #[test]
    fn parse_post() {
        let post = Post {
            id: "a".to_owned(),
            create_at: 1,
            update_at: 2,
            edit_at: 3,
            delete_at: 4,
            is_pinned: true,
            user_id: "b".to_owned(),
            channel_id: "c".to_owned(),
            message: "d".to_owned(),
            root_id: "e".to_owned(),
            ttype: "f".to_owned(),
        };
        let post_str = r#"{
                    "id":"a",
                    "create_at":1,
                    "update_at":2,
                    "edit_at":3,
                    "delete_at":4,
                    "is_pinned":true,
                    "user_id":"b",
                    "channel_id":"c",
                    "message":"d",
                    "root_id":"e",
                    "type":"f"
                }"#;
        let d: Result<Post, _> = serde_json::from_str(post_str);
        assert_eq!(d.unwrap(), post);
        let data = format!(
            "\"{}\"",
            post_str.replace('\n', "\\n").replace('\"', "\\\"")
        );
        let x: Value = serde_json::from_str(&data).unwrap();
        let s = x.as_str().unwrap();
        let d: Result<Post, _> = serde_json::from_str(s);
        assert_eq!(d.unwrap(), post);
    }

    #[test]
    fn parse_update() {
        let post = Post {
            id: "a".to_owned(),
            create_at: 1,
            update_at: 2,
            edit_at: 3,
            delete_at: 4,
            is_pinned: true,
            user_id: "b".to_owned(),
            channel_id: "c".to_owned(),
            message: "d".to_owned(),
            root_id: "e".to_owned(),
            ttype: "f".to_owned(),
        };
        let data = r#"
        {
            "data":{
                "connection_id":  "aaaa",
                "server_version": "2137"
            },
            "event":"hello"
        }"#;
        let update: Result<Update, _> = serde_json::from_str(data);
        assert_eq!(
            update.unwrap(),
            Update::Hello(super::Hello {
                connection_id: "aaaa".to_owned(),
                server_version: "2137".to_owned()
            })
        );
        let data = r#"
        {
            "data":{
                "channel_display_name":"a",
                "channel_name":"b",
                "channel_type":"c",
                "mentions":"[\"d\"]",
                "post": "{\"id\":\"a\",\"create_at\":1,\"update_at\":2,\"edit_at\":3,\"delete_at\":4,\"is_pinned\":true,\"user_id\":\"b\",\"channel_id\":\"c\",\"message\":\"d\",\"root_id\":\"e\",\"type\":\"f\"}"
            },
            "event":"posted"
        }"#;
        let update: Result<Update, _> = serde_json::from_str(&data);
        assert_eq!(
            update.unwrap(),
            Update::Posted(super::Posted {
                channel_display_name: "a".to_owned(),
                channel_name: "b".to_owned(),
                channel_type: "c".to_owned(),
                mentions: vec!["d".to_owned()],
                post: post
            })
        );
    }
    #[test]
    fn parse_websocketupdate() {
        let post = Post {
            id: "a".to_owned(),
            create_at: 1,
            update_at: 2,
            edit_at: 3,
            delete_at: 4,
            is_pinned: true,
            user_id: "b".to_owned(),
            channel_id: "c".to_owned(),
            message: "d".to_owned(),
            root_id: "e".to_owned(),
            ttype: "f".to_owned(),
        };
        let data = r#"
        {
            "broadcast":{
                "channel_id":"a",
                "connection_id":"b",
                "omit_connection_id":"c",
                "team_id":"d",
                "user_id":"e"
            },
            "data":{
                "connection_id":  "aaaa",
                "server_version": "2137"
            },
            "event":"hello",
            "seq":2137
        }"#;
        let update: Result<WebsocketUpdate, _> = serde_json::from_str(data);
        assert_eq!(
            update.unwrap(),
            WebsocketUpdate {
                stuff: WebsocketUpdateStuff {
                    broadcast: Broadcast {
                        channel_id: "a".to_owned(),
                        connection_id: "b".to_owned(),
                        omit_connection_id: "c".to_owned(),
                        team_id: "d".to_owned(),
                        user_id: "e".to_owned()
                    },
                    seq: 2137,
                },
                update: Update::Hello(super::Hello {
                    connection_id: "aaaa".to_owned(),
                    server_version: "2137".to_owned()
                })
            }
        );
        let data = r#"
        {
            "broadcast":{
                "channel_id":"a",
                "connection_id":"b",
                "omit_connection_id":"c",
                "team_id":"d",
                "user_id":"e"
            },
            "data":{
                "channel_display_name":"a",
                "channel_name":"b",
                "channel_type":"c",
                "mentions":"[\"d\"]",
                "post": "{\"id\":\"a\",\"create_at\":1,\"update_at\":2,\"edit_at\":3,\"delete_at\":4,\"is_pinned\":true,\"user_id\":\"b\",\"channel_id\":\"c\",\"message\":\"d\",\"root_id\":\"e\",\"type\":\"f\"}"
            },
            "event":"posted",
            "seq": 2137
        }"#;
        let update: Result<WebsocketUpdate, _> = serde_json::from_str(&data);
        assert_eq!(
            update.unwrap(),
            WebsocketUpdate {
                stuff: WebsocketUpdateStuff {
                    broadcast: Broadcast {
                        channel_id: "a".to_owned(),
                        connection_id: "b".to_owned(),
                        omit_connection_id: "c".to_owned(),
                        team_id: "d".to_owned(),
                        user_id: "e".to_owned()
                    },
                    seq: 2137,
                },
                update: Update::Posted(super::Posted {
                    channel_display_name: "a".to_owned(),
                    channel_name: "b".to_owned(),
                    channel_type: "c".to_owned(),
                    mentions: vec!["d".to_owned()],
                    post: post
                })
            }
        );
    }
    #[test]
    fn parse_realexamples() {
        let data = r#"{"event":"posted","data":{"channel_display_name":"a","channel_name":"a","channel_type":"O","post":"{\"id\":\"b\",\"create_at\":1,\"update_at\":2,\"edit_at\":0,\"delete_at\":0,\"is_pinned\":false,\"user_id\":\"b\",\"channel_id\":\"c\",\"root_id\":\"\",\"original_id\":\"\",\"message\":\"blah\",\"type\":\"\",\"props\":{\"disable_group_highlight\":true},\"hashtags\":\"\",\"pending_post_id\":\"d\",\"reply_count\":0,\"last_reply_at\":0,\"participants\":null,\"metadata\":{}}","sender_name":"@blah","set_online":true,"team_id":"e"},"broadcast":{"omit_users":null,"user_id":"","channel_id":"f","team_id":"","connection_id":"","omit_connection_id":""},"seq":3}"#;

        serde_json::from_str::<WebsocketUpdate>(data).unwrap();
    }
}