use crate::structs::PrivateMessageReportView;
use diesel::{result::Error, ExpressionMethods, JoinOnDsl, NullableExpressionMethods, QueryDsl};
use diesel_async::RunQueryDsl;
use lemmy_db_schema::{
  newtypes::PrivateMessageReportId,
  schema::{person, private_message, private_message_report},
  source::{
    person::Person,
    private_message::PrivateMessage,
    private_message_report::PrivateMessageReport,
  },
  traits::JoinView,
  utils::{get_conn, limit_and_offset, DbPool},
};
use typed_builder::TypedBuilder;

type PrivateMessageReportViewTuple = (
  PrivateMessageReport,
  PrivateMessage,
  Person,
  Person,
  Option<Person>,
);

impl PrivateMessageReportView {
  /// returns the PrivateMessageReportView for the provided report_id
  ///
  /// * `report_id` - the report id to obtain
  pub async fn read(
    pool: &mut DbPool<'_>,
    report_id: PrivateMessageReportId,
  ) -> Result<Self, Error> {
    let conn = &mut get_conn(pool).await?;
    let (person_alias_1, person_alias_2) = diesel::alias!(person as person1, person as person2);

    let (private_message_report, private_message, private_message_creator, creator, resolver) =
      private_message_report::table
        .find(report_id)
        .inner_join(private_message::table)
        .inner_join(person::table.on(private_message::creator_id.eq(person::id)))
        .inner_join(
          person_alias_1
            .on(private_message_report::creator_id.eq(person_alias_1.field(person::id))),
        )
        .left_join(
          person_alias_2.on(
            private_message_report::resolver_id.eq(person_alias_2.field(person::id).nullable()),
          ),
        )
        .select((
          private_message_report::all_columns,
          private_message::all_columns,
          person::all_columns,
          person_alias_1.fields(person::all_columns),
          person_alias_2.fields(person::all_columns).nullable(),
        ))
        .first::<PrivateMessageReportViewTuple>(conn)
        .await?;

    Ok(Self {
      private_message_report,
      private_message,
      private_message_creator,
      creator,
      resolver,
    })
  }

  /// Returns the current unresolved post report count for the communities you mod
  pub async fn get_report_count(pool: &mut DbPool<'_>) -> Result<i64, Error> {
    use diesel::dsl::count;
    let conn = &mut get_conn(pool).await?;

    private_message_report::table
      .inner_join(private_message::table)
      .filter(private_message_report::resolved.eq(false))
      .into_boxed()
      .select(count(private_message_report::id))
      .first::<i64>(conn)
      .await
  }
}

#[derive(TypedBuilder)]
#[builder(field_defaults(default))]
pub struct PrivateMessageReportQuery<'a, 'b: 'a> {
  #[builder(!default)]
  pool: &'a mut DbPool<'b>,
  page: Option<i64>,
  limit: Option<i64>,
  unresolved_only: Option<bool>,
}

impl<'a, 'b: 'a> PrivateMessageReportQuery<'a, 'b> {
  pub async fn list(self) -> Result<Vec<PrivateMessageReportView>, Error> {
    let conn = &mut get_conn(self.pool).await?;
    let (person_alias_1, person_alias_2) = diesel::alias!(person as person1, person as person2);

    let mut query = private_message_report::table
      .inner_join(private_message::table)
      .inner_join(person::table.on(private_message::creator_id.eq(person::id)))
      .inner_join(
        person_alias_1.on(private_message_report::creator_id.eq(person_alias_1.field(person::id))),
      )
      .left_join(
        person_alias_2
          .on(private_message_report::resolver_id.eq(person_alias_2.field(person::id).nullable())),
      )
      .select((
        private_message_report::all_columns,
        private_message::all_columns,
        person::all_columns,
        person_alias_1.fields(person::all_columns),
        person_alias_2.fields(person::all_columns).nullable(),
      ))
      .into_boxed();

    if self.unresolved_only.unwrap_or(false) {
      query = query.filter(private_message_report::resolved.eq(false));
    }

    let (limit, offset) = limit_and_offset(self.page, self.limit)?;

    query = query
      .order_by(private_message::published.desc())
      .limit(limit)
      .offset(offset);

    let res = query.load::<PrivateMessageReportViewTuple>(conn).await?;

    Ok(
      res
        .into_iter()
        .map(PrivateMessageReportView::from_tuple)
        .collect(),
    )
  }
}

impl JoinView for PrivateMessageReportView {
  type JoinTuple = PrivateMessageReportViewTuple;
  fn from_tuple(a: Self::JoinTuple) -> Self {
    Self {
      private_message_report: a.0,
      private_message: a.1,
      private_message_creator: a.2,
      creator: a.3,
      resolver: a.4,
    }
  }
}

#[cfg(test)]
mod tests {
  use crate::private_message_report_view::PrivateMessageReportQuery;
  use lemmy_db_schema::{
    source::{
      instance::Instance,
      person::{Person, PersonInsertForm},
      private_message::{PrivateMessage, PrivateMessageInsertForm},
      private_message_report::{PrivateMessageReport, PrivateMessageReportForm},
    },
    traits::{Crud, Reportable},
    utils::build_db_pool_for_tests,
  };
  use serial_test::serial;

  #[tokio::test]
  #[serial]
  async fn test_crud() {
    let pool = &build_db_pool_for_tests().await;
    let pool = &mut pool.into();

    let inserted_instance = Instance::read_or_create(pool, "my_domain.tld".to_string())
      .await
      .unwrap();

    let new_person_1 = PersonInsertForm::builder()
      .name("timmy_mrv".into())
      .public_key("pubkey".to_string())
      .instance_id(inserted_instance.id)
      .build();
    let inserted_timmy = Person::create(pool, &new_person_1).await.unwrap();

    let new_person_2 = PersonInsertForm::builder()
      .name("jessica_mrv".into())
      .public_key("pubkey".to_string())
      .instance_id(inserted_instance.id)
      .build();
    let inserted_jessica = Person::create(pool, &new_person_2).await.unwrap();

    // timmy sends private message to jessica
    let pm_form = PrivateMessageInsertForm::builder()
      .creator_id(inserted_timmy.id)
      .recipient_id(inserted_jessica.id)
      .content("something offensive".to_string())
      .build();
    let pm = PrivateMessage::create(pool, &pm_form).await.unwrap();

    // jessica reports private message
    let pm_report_form = PrivateMessageReportForm {
      creator_id: inserted_jessica.id,
      original_pm_text: pm.content.clone(),
      private_message_id: pm.id,
      reason: "its offensive".to_string(),
    };
    let pm_report = PrivateMessageReport::report(pool, &pm_report_form)
      .await
      .unwrap();

    let reports = PrivateMessageReportQuery::builder()
      .pool(pool)
      .build()
      .list()
      .await
      .unwrap();
    assert_eq!(1, reports.len());
    assert!(!reports[0].private_message_report.resolved);
    assert_eq!(inserted_timmy.name, reports[0].private_message_creator.name);
    assert_eq!(inserted_jessica.name, reports[0].creator.name);
    assert_eq!(pm_report.reason, reports[0].private_message_report.reason);
    assert_eq!(pm.content, reports[0].private_message.content);

    let new_person_3 = PersonInsertForm::builder()
      .name("admin_mrv".into())
      .public_key("pubkey".to_string())
      .instance_id(inserted_instance.id)
      .build();
    let inserted_admin = Person::create(pool, &new_person_3).await.unwrap();

    // admin resolves the report (after taking appropriate action)
    PrivateMessageReport::resolve(pool, pm_report.id, inserted_admin.id)
      .await
      .unwrap();

    let reports = PrivateMessageReportQuery::builder()
      .pool(pool)
      .unresolved_only(Some(false))
      .build()
      .list()
      .await
      .unwrap();
    assert_eq!(1, reports.len());
    assert!(reports[0].private_message_report.resolved);
    assert!(reports[0].resolver.is_some());
    assert_eq!(
      inserted_admin.name,
      reports[0].resolver.as_ref().unwrap().name
    );

    Instance::delete(pool, inserted_instance.id).await.unwrap();
  }
}