use axum::{extract::State, routing::get, Router};
use maud::Markup;
use sqlx::sqlite::SqlitePool;

use crate::{channel::repo::Provider as _, error::InternalError, login::repo::logins::Login};

async fn index(
    State(db): State<SqlitePool>,
    login: Option<Login>,
) -> Result<Markup, InternalError> {
    match login {
        None => Ok(templates::unauthenticated()),
        Some(login) => index_authenticated(db, login).await,
    }
}

async fn index_authenticated(db: SqlitePool, login: Login) -> Result<Markup, InternalError> {
    let mut tx = db.begin().await?;
    let joined_channels = tx.channels().joined(&login.id).await?;
    let unjoined_channels = tx.channels().unjoined(&login.id).await?;
    tx.commit().await?;

    Ok(templates::authenticated(
        login,
        &joined_channels,
        &unjoined_channels,
    ))
}

pub fn router() -> Router<SqlitePool> {
    Router::new().route("/", get(index))
}

mod templates {
    use maud::{html, Markup, DOCTYPE};

    use crate::{channel::repo::Channel, login::repo::logins::Login};

    pub fn authenticated<'c>(
        login: Login,
        joined_channels: impl IntoIterator<Item = &'c Channel>,
        unjoined_channels: impl IntoIterator<Item = &'c Channel>,
    ) -> Markup {
        html! {
            (DOCTYPE)
            head {
                title { "hi" }
            }
            body {
                section {
                    (channel_list(joined_channels))
                    (join_channel(unjoined_channels))
                    (create_channel())
                }
                section {
                    (logout_form(&login.name))
                }
            }
        }
    }

    fn channel_list<'c>(joined_channels: impl IntoIterator<Item = &'c Channel>) -> Markup {
        html! {
            ul {
                @for channel in joined_channels {
                    (joined_channel_entry(&channel))
                }
            }
        }
    }

    fn joined_channel_entry(channel: &Channel) -> Markup {
        let leave_url = format!("/{}/leave", channel.id);
        html! {
            li {
                (channel.name) " (" (channel.id) ")"
                form action=(leave_url) method="post" {
                    button {
                        "leave"
                    }
                }
            }
        }
    }

    fn join_channel<'c>(unjoined_channels: impl IntoIterator<Item = &'c Channel>) -> Markup {
        html! {
            form action="join" method="post" {
                select name="channel" required {
                    option value="" { "channel" }
                    @for channel in unjoined_channels {
                        option value=(channel.id) {
                            (channel.name) " (" (channel.id) ")"
                        }
                    }
                }
                button {
                    "join"
                }
            }
        }
    }

    fn create_channel() -> Markup {
        html! {
            form action="/create" method="post" {
                label {
                    "name"
                    input name="name" type="text" {}
                }
                button {
                    "start channel"
                }
            }
        }
    }

    fn logout_form(name: &str) -> Markup {
        html! {
            form action="/logout" method="post" {
                button { "bye, " (name) }
            }
        }
    }

    pub fn unauthenticated() -> Markup {
        html! {
            (DOCTYPE)
            head {
                title { "hi" }
            }
            body {
                (login_form())
            }
        }
    }

    fn login_form() -> Markup {
        html! {
            form action="/login" method="post" {
                label {
                    "login"
                    input name="name" type="text" {}
                }
                label {
                    "password"
                    input name="password" type="password" {}
                }
                button { "hi" }
            }
        }
    }
}