use anyhow::Context;
use axum::{
    extract::{Query, State},
    response::{IntoResponse, Json},
    routing::get,
    Router,
};
use diesel::{dsl::insert_into, prelude::*, update};
use serde::Deserialize;
use serde_json::json;
use uuid::Uuid;

use crate::{
    api_keys::ApiKey,
    app_error::AppError,
    app_state::{AppState, DbConn},
    email::{MailSender as _, Mailer},
    projects::Project,
    schema::{api_keys, projects},
    settings::Settings,
};

pub fn new_router(state: AppState) -> Router<AppState> {
    Router::new().route("/say", get(say_get)).with_state(state)
}

#[derive(Deserialize)]
struct SayQuery {
    key: Uuid,
    project: String,
    message: String,
}

async fn say_get(
    State(Settings {
        email: email_settings,
        ..
    }): State<Settings>,
    State(mailer): State<Mailer>,
    DbConn(db_conn): DbConn,
    Query(query): Query<SayQuery>,
) -> Result<impl IntoResponse, AppError> {
    let key = query.key.clone();
    let maybe_api_key = db_conn
        .interact(move |conn| {
            update(api_keys::table.filter(ApiKey::with_id(key)))
                .set(api_keys::last_used_at.eq(diesel::dsl::now))
                .returning(ApiKey::as_returning())
                .get_result(conn)
                .optional()
        })
        .await
        .unwrap()
        .context("unable to get API key")?;
    let api_key = match maybe_api_key {
        Some(api_key) => api_key,
        None => return Err(AppError::ForbiddenError("key not accepted".to_string())),
    };
    let project_name = query.project.to_lowercase();
    let selected_channels = db_conn
        .interact(move |conn| {
            insert_into(projects::table)
                .values((
                    projects::id.eq(Uuid::now_v7()),
                    projects::team_id.eq(api_key.team_id.clone()),
                    projects::name.eq(project_name.clone()),
                ))
                .on_conflict((projects::team_id, projects::name))
                .do_nothing()
                .execute(conn)
                .context("failed to insert project")?;
            // It would be nice to merge these two database operations into one,
            // but it's not trivial to do so without faking an update; refer to:
            // https://stackoverflow.com/a/42217872
            let project = Project::all()
                .filter(Project::with_team(api_key.team_id))
                .filter(Project::with_name(project_name))
                .first(conn)
                .context("failed to load project")?;
            project
                .selected_channels()
                .load(conn)
                .context("failed to load selected channels")
        })
        .await
        .unwrap()
        .context("unable to get project")?;

    for channel in selected_channels {
        if let Some(email_data) = channel.email_data {
            if email_data.verified {
                let recipient: lettre::message::Mailbox = email_data.recipient.parse()?;
                let email = crate::email::Message {
                    from: email_settings.message_from.clone().into(),
                    to: recipient.into(),
                    subject: "Shout".to_string(),
                    text_body: query.message.clone(),
                };
                tracing::info!("Sending email to recipient for channel {}", channel.id);
                mailer.send_batch(vec![email]).await?;
            } else {
                tracing::info!("Email recipient for channel {} is not verified", channel.id);
            }
        }
    }

    Ok(Json(json!({ "ok": true })))
}