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use chrono::{DateTime, Utc};
use jid::JID;
use sqlx::Sqlite;
use uuid::Uuid;

#[derive(Debug, sqlx::FromRow, Clone)]
pub struct Message {
    pub id: Uuid,
    // does not contain full user information
    #[sqlx(rename = "from_jid")]
    // bare jid (for now)
    pub from: JID,
    pub delivery: Option<Delivery>,
    pub timestamp: DateTime<Utc>,
    // TODO: originally_from
    // TODO: message edits
    // TODO: message timestamp
    #[sqlx(flatten)]
    pub body: Body,
}

#[derive(Debug, Clone, Copy)]
pub enum Delivery {
    Sending,
    Written,
    Sent,
    Delivered,
    Read,
    Failed,
    Queued,
}

impl sqlx::Type<Sqlite> for Delivery {
    fn type_info() -> <Sqlite as sqlx::Database>::TypeInfo {
        <&str as sqlx::Type<Sqlite>>::type_info()
    }
}

impl sqlx::Decode<'_, Sqlite> for Delivery {
    fn decode(
        value: <Sqlite as sqlx::Database>::ValueRef<'_>,
    ) -> Result<Self, sqlx::error::BoxDynError> {
        let value = <&str as sqlx::Decode<Sqlite>>::decode(value)?;
        match value {
            "sending" => Ok(Self::Sending),
            "written" => Ok(Self::Written),
            "sent" => Ok(Self::Sent),
            "delivered" => Ok(Self::Delivered),
            "read" => Ok(Self::Read),
            "failed" => Ok(Self::Failed),
            "queued" => Ok(Self::Queued),
            _ => unreachable!(),
        }
    }
}

impl sqlx::Encode<'_, Sqlite> for Delivery {
    fn encode_by_ref(
        &self,
        buf: &mut <Sqlite as sqlx::Database>::ArgumentBuffer<'_>,
    ) -> Result<sqlx::encode::IsNull, sqlx::error::BoxDynError> {
        let value = match self {
            Delivery::Sending => "sending",
            Delivery::Written => "written",
            Delivery::Sent => "sent",
            Delivery::Delivered => "delivered",
            Delivery::Read => "read",
            Delivery::Failed => "failed",
            Delivery::Queued => "queued",
        };
        <&str as sqlx::Encode<Sqlite>>::encode(value, buf)
    }
}

// TODO: user migrations
// pub enum Migrated {
//     Jabber(User),
//     Outside,
// }

#[derive(Debug, sqlx::FromRow, Clone)]
pub struct Body {
    // TODO: rich text, other contents, threads
    pub body: String,
}

#[derive(sqlx::FromRow, Debug, Clone)]
pub struct Chat {
    pub correspondent: JID,
    pub have_chatted: bool,
    // pub unread_messages: i32,
    // pub latest_message: Message,
    // when a new message is received, the chat should be updated, and the new message should be delivered too.
    // message history is not stored in chat, retreived separately.
    // pub message_history: Vec<Message>,
}

pub enum ChatUpdate {}

impl Chat {
    pub fn new(correspondent: JID, have_chatted: bool) -> Self {
        Self {
            correspondent,
            have_chatted,
        }
    }
    pub fn correspondent(&self) -> &JID {
        &self.correspondent
    }
}

// TODO: group chats
// pub enum Chat {
//     Direct(DirectChat),
//     Channel(Channel),
// }
// pub struct Channel {}