use sqlx::{sqlite::Sqlite, SqliteConnection, Transaction};

use crate::{
    clock::DateTime,
    event::{Instant, ResumePoint, Sequence},
    login::{password::StoredHash, History, Id, Login},
};

pub trait Provider {
    fn logins(&mut self) -> Logins;
}

impl<'c> Provider for Transaction<'c, Sqlite> {
    fn logins(&mut self) -> Logins {
        Logins(self)
    }
}

pub struct Logins<'t>(&'t mut SqliteConnection);

impl<'c> Logins<'c> {
    pub async fn create(
        &mut self,
        name: &str,
        password_hash: &StoredHash,
        created: &Instant,
    ) -> Result<History, sqlx::Error> {
        let id = Id::generate();

        let login = sqlx::query!(
            r#"
                insert
                into login (id, name, password_hash, created_sequence, created_at)
                values ($1, $2, $3, $4, $5)
                returning
                    id as "id: Id",
                    name,
                    created_sequence as "created_sequence: Sequence",
                    created_at as "created_at: DateTime"
            "#,
            id,
            name,
            password_hash,
            created.sequence,
            created.at,
        )
        .map(|row| History {
            login: Login {
                id: row.id,
                name: row.name,
            },
            created: Instant {
                at: row.created_at,
                sequence: row.created_sequence,
            },
        })
        .fetch_one(&mut *self.0)
        .await?;

        Ok(login)
    }

    pub async fn all(&mut self, resume_at: ResumePoint) -> Result<Vec<History>, sqlx::Error> {
        let channels = sqlx::query!(
            r#"
                select
                    id as "id: Id",
                    name,
                    created_sequence as "created_sequence: Sequence",
                    created_at as "created_at: DateTime"
                from login
                    where coalesce(created_sequence <= $1, true)
                    order by created_sequence
            "#,
            resume_at,
        )
        .map(|row| History {
            login: Login {
                id: row.id,
                name: row.name,
            },
            created: Instant {
                at: row.created_at,
                sequence: row.created_sequence,
            },
        })
        .fetch_all(&mut *self.0)
        .await?;

        Ok(channels)
    }
    pub async fn replay(&mut self, resume_at: ResumePoint) -> Result<Vec<History>, sqlx::Error> {
        let messages = sqlx::query!(
            r#"
                select
                    id as "id: Id",
                    name,
                    created_sequence as "created_sequence: Sequence",
                    created_at as "created_at: DateTime"
                from login
                where coalesce(login.created_sequence > $1, true)
            "#,
            resume_at,
        )
        .map(|row| History {
            login: Login {
                id: row.id,
                name: row.name,
            },
            created: Instant {
                at: row.created_at,
                sequence: row.created_sequence,
            },
        })
        .fetch_all(&mut *self.0)
        .await?;

        Ok(messages)
    }
}

impl<'t> From<&'t mut SqliteConnection> for Logins<'t> {
    fn from(tx: &'t mut SqliteConnection) -> Self {
        Self(tx)
    }
}