//! Client (organization) database operations

use serde::{Deserialize, Serialize};
use sqlx::PgPool;
use uuid::Uuid;

/// Client record from database
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct Client {
    pub id: Uuid,
    pub name: String,
    pub code: Option<String>,
    pub notes: Option<String>,
    pub is_active: bool,
    pub created_at: chrono::DateTime<chrono::Utc>,
    pub updated_at: chrono::DateTime<chrono::Utc>,
}

/// Client response for API
#[derive(Debug, Clone, Serialize)]
pub struct ClientResponse {
    pub id: Uuid,
    pub name: String,
    pub code: Option<String>,
    pub notes: Option<String>,
    pub is_active: bool,
    pub created_at: chrono::DateTime<chrono::Utc>,
    pub site_count: Option<i64>,
    pub agent_count: Option<i64>,
}

impl From<Client> for ClientResponse {
    fn from(c: Client) -> Self {
        ClientResponse {
            id: c.id,
            name: c.name,
            code: c.code,
            notes: c.notes,
            is_active: c.is_active,
            created_at: c.created_at,
            site_count: None,
            agent_count: None,
        }
    }
}

/// Data for creating a new client
#[derive(Debug, Deserialize)]
pub struct CreateClient {
    pub name: String,
    pub code: Option<String>,
    pub notes: Option<String>,
}

/// Data for updating a client
#[derive(Debug, Deserialize)]
pub struct UpdateClient {
    pub name: Option<String>,
    pub code: Option<String>,
    pub notes: Option<String>,
    pub is_active: Option<bool>,
}

/// Create a new client
pub async fn create_client(pool: &PgPool, client: CreateClient) -> Result<Client, sqlx::Error> {
    sqlx::query_as::<_, Client>(
        r#"
        INSERT INTO clients (name, code, notes)
        VALUES ($1, $2, $3)
        RETURNING *
        "#,
    )
    .bind(&client.name)
    .bind(&client.code)
    .bind(&client.notes)
    .fetch_one(pool)
    .await
}

/// Get a client by ID
pub async fn get_client_by_id(pool: &PgPool, id: Uuid) -> Result<Option<Client>, sqlx::Error> {
    sqlx::query_as::<_, Client>("SELECT * FROM clients WHERE id = $1")
        .bind(id)
        .fetch_optional(pool)
        .await
}

/// Get all clients
pub async fn get_all_clients(pool: &PgPool) -> Result<Vec<Client>, sqlx::Error> {
    sqlx::query_as::<_, Client>("SELECT * FROM clients ORDER BY name")
        .fetch_all(pool)
        .await
}

/// Get all clients with counts
#[derive(Debug, Clone, sqlx::FromRow)]
pub struct ClientWithCounts {
    pub id: Uuid,
    pub name: String,
    pub code: Option<String>,
    pub notes: Option<String>,
    pub is_active: bool,
    pub created_at: chrono::DateTime<chrono::Utc>,
    pub updated_at: chrono::DateTime<chrono::Utc>,
    pub site_count: i64,
    pub agent_count: i64,
}

pub async fn get_all_clients_with_counts(pool: &PgPool) -> Result<Vec<ClientWithCounts>, sqlx::Error> {
    sqlx::query_as::<_, ClientWithCounts>(
        r#"
        SELECT
            c.*,
            COALESCE((SELECT COUNT(*) FROM sites WHERE client_id = c.id), 0) as site_count,
            COALESCE((SELECT COUNT(*) FROM agents a JOIN sites s ON a.site_id = s.id WHERE s.client_id = c.id), 0) as agent_count
        FROM clients c
        ORDER BY c.name
        "#,
    )
    .fetch_all(pool)
    .await
}

/// Update a client
pub async fn update_client(
    pool: &PgPool,
    id: Uuid,
    update: UpdateClient,
) -> Result<Option<Client>, sqlx::Error> {
    sqlx::query_as::<_, Client>(
        r#"
        UPDATE clients
        SET name = COALESCE($1, name),
            code = COALESCE($2, code),
            notes = COALESCE($3, notes),
            is_active = COALESCE($4, is_active)
        WHERE id = $5
        RETURNING *
        "#,
    )
    .bind(&update.name)
    .bind(&update.code)
    .bind(&update.notes)
    .bind(&update.is_active)
    .bind(id)
    .fetch_optional(pool)
    .await
}

/// Delete a client
pub async fn delete_client(pool: &PgPool, id: Uuid) -> Result<bool, sqlx::Error> {
    let result = sqlx::query("DELETE FROM clients WHERE id = $1")
        .bind(id)
        .execute(pool)
        .await?;
    Ok(result.rows_affected() > 0)
}