use std::time::Duration;

use anyhow::anyhow;
use axum::{
  extract::{Multipart, State},
  Json,
};
use bollard::{
  container::{
    Config as ContainerConfig, CreateContainerOptions, StartContainerOptions,
  },
  image::CreateImageOptions,
  network::CreateNetworkOptions,
  Docker,
};
use entity::{process, service};
use futures::{FutureExt, TryStreamExt};
use migration::OnConflict;
use sea_orm::{ActiveModelTrait, DatabaseConnection, EntityTrait, Set};
use serde_json::{json, Value};
use tokio::time::sleep;
use uuid::Uuid;

use crate::error::Result;
use crate::{
  config::{Config, SourceConfig},
  error::AppError,
  jobs::{Job, Schedule},
  AppState,
};

pub async fn handle_upload_configuration(
  state: State<AppState>,
  form: Multipart,
) -> Result<Json<Value>, AppError> {
  let upload_form = extract_multipart(form).await.unwrap();
  let config_string = serde_json::to_string(&upload_form.config).unwrap();

  let mut result = service::ActiveModel {
    name: Set(upload_form.name),
    config: Set(config_string),
    status: Set("New".into()),
    ..Default::default()
  }
  .save(&state.conn)
  .await
  .unwrap();

  let id = result.id.take().unwrap();

  let conn = state.conn.clone();
  let job = Job {
    code: async move {
      spawn_docker(SpawnDockerOpts {
        service_id: id,
        conn,
        config: &upload_form.config,
      })
      .await
      .unwrap();
      println!("done with job");
    }
    .boxed(),
    schedule: Schedule::ASAP,
  };
  state.queue.push(job).await;
  println!("spawned job");

  Ok(Json(json! ({"id": id})))
}

struct UploadForm {
  name: String,
  config: Config,
}

async fn extract_multipart(mut form: Multipart) -> Result<UploadForm> {
  let mut name = None;
  let mut config = None::<Config>;
  while let Some(field) = form.next_field().await.unwrap() {
    let key = field.name().unwrap().to_owned();
    let value =
      String::from_utf8(field.bytes().await.unwrap().to_vec()).unwrap();
    match key.as_ref() {
      "name" => name = Some(value),
      "config" => config = Some(serde_yaml::from_str(&value).unwrap()),
      _ => return Err(anyhow!("error").into()),
    }
  }

  Ok(UploadForm {
    name: name.unwrap(),
    config: config.unwrap(),
  })
}

struct SpawnDockerOpts<'a> {
  conn: DatabaseConnection,
  config: &'a Config,
  service_id: i32,
}

async fn spawn_docker(opts: SpawnDockerOpts<'_>) -> Result<()> {
  println!("Loading config: {:?}", opts.config);

  let docker = Docker::connect_with_local_defaults().unwrap();
  println!("connected to docker {docker:?}");
  sleep(Duration::from_secs(1)).await;

  // Create a bridge network
  let network_id = format!("aah-network-{}", Uuid::new_v4());
  docker
    .create_network(CreateNetworkOptions {
      name: network_id.clone(),
      ..Default::default()
    })
    .await?;
  println!("Created network.");

  // Create all the services
  for (service_name, service_config) in opts.config.service.iter() {
    // Insert metadata into the db
    let new_process = process::ActiveModel {
      service_id: Set(Some(opts.service_id)),
      name: Set(service_name.clone()),
      status: Set("New".to_owned()),
      ..Default::default()
    };
    process::Entity::insert(new_process)
      .on_conflict(
        OnConflict::columns([
          process::Column::ServiceId,
          process::Column::Name,
        ])
        .update_column(process::Column::Status)
        .to_owned(),
      )
      .exec(&opts.conn)
      .await?;

    println!("preparing config for {}", service_name);
    let SourceConfig::Image { image: from_image } = &service_config.source;

    println!("creating image {}", from_image);
    let mut result_stream = docker.create_image(
      Some(CreateImageOptions {
        from_image: from_image.to_owned(),
        ..Default::default()
      }),
      None,
      None,
    );
    println!("result stream: ");

    while let Ok(Some(v)) = result_stream.try_next().await {
      println!("v: {v:?}");
    }
    println!("completed pulling.");

    // create a container
    let result = docker
      .create_container(
        Some(CreateContainerOptions::<String> {
          ..Default::default()
        }),
        ContainerConfig {
          image: Some(from_image.to_owned()),
          ..Default::default()
        },
      )
      .await
      .unwrap();

    // Start the container
    docker
      .start_container(&result.id, None::<StartContainerOptions<String>>)
      .await
      .unwrap();

    println!("result: {result:?}");
  }

  Ok(())
}