use crate::domain::models::Column;
use common_telemetry::AppError;
use sqlx::PgPool;
use uuid::Uuid;

pub async fn create_column(
    pool: &PgPool,
    tenant_id: Uuid,
    name: String,
    slug: String,
    description: Option<String>,
    parent_id: Option<Uuid>,
    sort_order: i32,
) -> Result<Column, AppError> {
    let column = sqlx::query_as::<_, Column>(
        r#"
        INSERT INTO cms_columns (tenant_id, name, slug, description, parent_id, sort_order)
        VALUES ($1, $2, $3, $4, $5, $6)
        RETURNING tenant_id, id, name, slug, description, parent_id, sort_order, created_at, updated_at
        "#,
    )
    .bind(tenant_id)
    .bind(name)
    .bind(slug)
    .bind(description)
    .bind(parent_id)
    .bind(sort_order)
    .fetch_one(pool)
    .await?;

    Ok(column)
}

pub async fn get_column(pool: &PgPool, tenant_id: Uuid, id: Uuid) -> Result<Column, AppError> {
    let column = sqlx::query_as::<_, Column>(
        r#"
        SELECT tenant_id, id, name, slug, description, parent_id, sort_order, created_at, updated_at
        FROM cms_columns
        WHERE tenant_id = $1 AND id = $2
        "#,
    )
    .bind(tenant_id)
    .bind(id)
    .fetch_one(pool)
    .await?;

    Ok(column)
}

pub async fn update_column(
    pool: &PgPool,
    tenant_id: Uuid,
    id: Uuid,
    name: Option<String>,
    slug: Option<String>,
    description: Option<Option<String>>,
    parent_id: Option<Option<Uuid>>,
    sort_order: Option<i32>,
) -> Result<Column, AppError> {
    let column = sqlx::query_as::<_, Column>(
        r#"
        UPDATE cms_columns
        SET
            name = COALESCE($3, name),
            slug = COALESCE($4, slug),
            description = COALESCE($5, description),
            parent_id = COALESCE($6, parent_id),
            sort_order = COALESCE($7, sort_order),
            updated_at = now()
        WHERE tenant_id = $1 AND id = $2
        RETURNING tenant_id, id, name, slug, description, parent_id, sort_order, created_at, updated_at
        "#,
    )
    .bind(tenant_id)
    .bind(id)
    .bind(name)
    .bind(slug)
    .bind(description)
    .bind(parent_id)
    .bind(sort_order)
    .fetch_one(pool)
    .await?;

    Ok(column)
}

pub async fn delete_column(pool: &PgPool, tenant_id: Uuid, id: Uuid) -> Result<(), AppError> {
    let res = sqlx::query(
        r#"
        DELETE FROM cms_columns
        WHERE tenant_id = $1 AND id = $2
        "#,
    )
    .bind(tenant_id)
    .bind(id)
    .execute(pool)
    .await?;

    if res.rows_affected() == 0 {
        return Err(AppError::NotFound("column:not_found".into()));
    }
    Ok(())
}

#[derive(Debug, Clone)]
pub struct ListColumnsQuery {
    pub page: u32,
    pub page_size: u32,
    pub search: Option<String>,
    pub parent_id: Option<Uuid>,
}

#[derive(Debug, Clone, serde::Serialize, utoipa::ToSchema)]
pub struct Paged<T> {
    pub items: Vec<T>,
    pub page: u32,
    pub page_size: u32,
    pub total: i64,
}

pub async fn list_columns(
    pool: &PgPool,
    tenant_id: Uuid,
    q: ListColumnsQuery,
) -> Result<Paged<Column>, AppError> {
    let page = q.page.max(1);
    let page_size = q.page_size.clamp(1, 200);
    let offset = ((page - 1) * page_size) as i64;
    let limit = page_size as i64;

    let like = q.search.map(|s| format!("%{}%", s));

    let total: i64 = sqlx::query_scalar(
        r#"
        SELECT COUNT(*)
        FROM cms_columns
        WHERE tenant_id = $1
          AND ($2::uuid IS NULL OR parent_id = $2)
          AND ($3::text IS NULL OR name ILIKE $3 OR slug ILIKE $3)
        "#,
    )
    .bind(tenant_id)
    .bind(q.parent_id)
    .bind(like.as_deref())
    .fetch_one(pool)
    .await?;

    let items = sqlx::query_as::<_, Column>(
        r#"
        SELECT tenant_id, id, name, slug, description, parent_id, sort_order, created_at, updated_at
        FROM cms_columns
        WHERE tenant_id = $1
          AND ($2::uuid IS NULL OR parent_id = $2)
          AND ($3::text IS NULL OR name ILIKE $3 OR slug ILIKE $3)
        ORDER BY sort_order ASC, updated_at DESC
        OFFSET $4
        LIMIT $5
        "#,
    )
    .bind(tenant_id)
    .bind(q.parent_id)
    .bind(like.as_deref())
    .bind(offset)
    .bind(limit)
    .fetch_all(pool)
    .await?;

    Ok(Paged {
        items,
        page,
        page_size,
        total,
    })
}