use derive_builder::Builder;
use serde::Serialize;
use sqlx::{PgExecutor, postgres::types::Oid, query_as};
use uuid::Uuid;

use crate::field::{Field, FieldType};

#[derive(Clone, Debug, Serialize)]
pub struct Lens {
    pub id: Uuid,
    pub name: String,
    pub base_id: Uuid,
    pub class_oid: Oid,
    pub display_type: LensDisplayType,
}

impl Lens {
    pub fn insertable_builder() -> InsertableLensBuilder {
        InsertableLensBuilder::default()
    }

    pub async fn fetch_by_id<'a, E: PgExecutor<'a>>(
        id: Uuid,
        app_db: E,
    ) -> Result<Option<Self>, sqlx::Error> {
        query_as!(
            Self,
            r#"
select
    id,
    name,
    base_id,
    class_oid,
    display_type as "display_type: LensDisplayType"
from lenses
where id = $1
"#,
            id
        )
        .fetch_optional(app_db)
        .await
    }

    pub async fn fetch_by_rel<'a, E: PgExecutor<'a>>(
        base_id: Uuid,
        rel_oid: Oid,
        app_db: E,
    ) -> Result<Vec<Self>, sqlx::Error> {
        query_as!(
            Self,
            r#"
select
    id,
    name,
    base_id,
    class_oid,
    display_type as "display_type: LensDisplayType"
from lenses
where base_id = $1 and class_oid = $2
"#,
            base_id,
            rel_oid
        )
        .fetch_all(app_db)
        .await
    }

    pub async fn fetch_fields<'a, E: PgExecutor<'a>>(
        &self,
        app_db: E,
    ) -> Result<Vec<Field>, sqlx::Error> {
        query_as!(
            Field,
            r#"
select
    id,
    name,
    label,
    field_type as "field_type: sqlx::types::Json<FieldType>",
    width_px
from fields
where lens_id = $1
"#,
            self.id
        )
        .fetch_all(app_db)
        .await
    }
}

#[derive(Clone, Debug, Serialize, sqlx::Type)]
#[sqlx(type_name = "lens_display_type", rename_all = "lowercase")]
pub enum LensDisplayType {
    Table,
}

#[derive(Builder, Clone, Debug)]
pub struct InsertableLens {
    name: String,
    base_id: Uuid,
    class_oid: Oid,
    display_type: LensDisplayType,
}

impl InsertableLens {
    pub async fn insert<'a, E: PgExecutor<'a>>(self, app_db: E) -> Result<Lens, sqlx::Error> {
        query_as!(
            Lens,
            r#"
insert into lenses
(id, base_id, class_oid, name, display_type)
values ($1, $2, $3, $4, $5)
returning
    id,
    name,
    base_id,
    class_oid,
    display_type as "display_type: LensDisplayType"
"#,
            Uuid::now_v7(),
            self.base_id,
            self.class_oid,
            self.name,
            self.display_type as LensDisplayType
        )
        .fetch_one(app_db)
        .await
    }
}