//! Administrator repository operations.

use crate::error::{DbError, Result};
use crate::models::{format_datetime, parse_datetime};
use chrono::Utc;
use nx9_wg_core::types::auth::Admin;
use sqlx::{Row, SqlitePool};

/// Retrieve the single administrator record, if initialized.
pub async fn get_admin(pool: &SqlitePool) -> Result<Option<Admin>> {
    let row = sqlx::query(
        r#"
        SELECT id, username, password_hash, totp_secret, totp_enabled,
               last_login_at, last_login_ip, created_at, updated_at
        FROM admin
        WHERE id = 1
        "#,
    )
    .fetch_optional(pool)
    .await
    .map_err(DbError::Sqlx)?;

    match row {
        Some(r) => {
            let id: i64 = r.try_get("id")?;
            let username: String = r.try_get("username")?;
            let password_hash: String = r.try_get("password_hash")?;
            let totp_secret: Option<String> = r.try_get("totp_secret")?;
            let totp_enabled_int: i64 = r.try_get("totp_enabled")?;
            let last_login_at_str: Option<String> = r.try_get("last_login_at")?;
            let last_login_ip: Option<String> = r.try_get("last_login_ip")?;
            let created_at_str: String = r.try_get("created_at")?;
            let updated_at_str: String = r.try_get("updated_at")?;

            let last_login_at = match last_login_at_str {
                Some(s) => Some(parse_datetime(&s)?),
                None => None,
            };

            Ok(Some(Admin {
                id,
                username,
                password_hash,
                totp_secret,
                totp_enabled: totp_enabled_int != 0,
                last_login_at,
                last_login_ip,
                created_at: parse_datetime(&created_at_str)?,
                updated_at: parse_datetime(&updated_at_str)?,
            }))
        }
        None => Ok(None),
    }
}

/// Retrieve the administrator record by username.
pub async fn get_admin_by_username(pool: &SqlitePool, username: &str) -> Result<Option<Admin>> {
    let admin = get_admin(pool).await?;
    match admin {
        Some(a) if a.username == username => Ok(Some(a)),
        _ => Ok(None),
    }
}

/// Check whether the single administrator has already been initialized.
pub async fn admin_exists(pool: &SqlitePool) -> Result<bool> {
    let row = sqlx::query("SELECT COUNT(*) as count FROM admin WHERE id = 1")
        .fetch_one(pool)
        .await
        .map_err(DbError::Sqlx)?;

    let count: i64 = row.try_get("count")?;
    Ok(count > 0)
}

/// Create the single administrator record.
///
/// Fails if an administrator already exists.
pub async fn create_admin(pool: &SqlitePool, username: &str, password_hash: &str) -> Result<Admin> {
    if admin_exists(pool).await? {
        return Err(DbError::Conflict(
            "Administrator has already been initialized".to_string(),
        ));
    }

    let now = Utc::now().naive_utc();
    let now_str = format_datetime(&now);

    sqlx::query(
        r#"
        INSERT INTO admin (id, username, password_hash, totp_secret, totp_enabled, created_at, updated_at)
        VALUES (1, ?, ?, NULL, 0, ?, ?)
        "#,
    )
    .bind(username)
    .bind(password_hash)
    .bind(&now_str)
    .bind(&now_str)
    .execute(pool)
    .await
    .map_err(|e| match &e {
        sqlx::Error::Database(dbe) if dbe.is_unique_violation() => {
            DbError::Conflict("Administrator already exists or username conflict".to_string())
        }
        _ => DbError::Sqlx(e),
    })?;

    Ok(Admin {
        id: 1,
        username: username.to_string(),
        password_hash: password_hash.to_string(),
        totp_secret: None,
        totp_enabled: false,
        last_login_at: None,
        last_login_ip: None,
        created_at: now,
        updated_at: now,
    })
}

/// Update the administrator's password hash.
pub async fn update_admin_password(pool: &SqlitePool, new_password_hash: &str) -> Result<()> {
    let now = Utc::now().naive_utc();
    let now_str = format_datetime(&now);

    let result = sqlx::query(
        r#"
        UPDATE admin
        SET password_hash = ?, updated_at = ?
        WHERE id = 1
        "#,
    )
    .bind(new_password_hash)
    .bind(&now_str)
    .execute(pool)
    .await
    .map_err(DbError::Sqlx)?;

    if result.rows_affected() == 0 {
        return Err(DbError::NotFound(
            "Administrator record does not exist".to_string(),
        ));
    }

    Ok(())
}

/// Update administrator TOTP configuration.
pub async fn update_admin_totp(
    pool: &SqlitePool,
    totp_secret: Option<&str>,
    totp_enabled: bool,
) -> Result<()> {
    let now = Utc::now().naive_utc();
    let now_str = format_datetime(&now);

    let result = sqlx::query(
        r#"
        UPDATE admin
        SET totp_secret = ?, totp_enabled = ?, updated_at = ?
        WHERE id = 1
        "#,
    )
    .bind(totp_secret)
    .bind(if totp_enabled { 1 } else { 0 })
    .bind(&now_str)
    .execute(pool)
    .await
    .map_err(DbError::Sqlx)?;

    if result.rows_affected() == 0 {
        return Err(DbError::NotFound(
            "Administrator record does not exist".to_string(),
        ));
    }

    Ok(())
}

/// Record a successful administrator login timestamp and IP address.
pub async fn record_admin_login(pool: &SqlitePool, ip_address: Option<&str>) -> Result<()> {
    let now = Utc::now().naive_utc();
    let now_str = format_datetime(&now);

    let result = sqlx::query(
        r#"
        UPDATE admin
        SET last_login_at = ?, last_login_ip = ?, updated_at = ?
        WHERE id = 1
        "#,
    )
    .bind(&now_str)
    .bind(ip_address)
    .bind(&now_str)
    .execute(pool)
    .await
    .map_err(DbError::Sqlx)?;

    if result.rows_affected() == 0 {
        return Err(DbError::NotFound(
            "Administrator record does not exist".to_string(),
        ));
    }

    Ok(())
}

/// Delete administrator record (if explicitly supported).
pub async fn delete_admin(pool: &SqlitePool) -> Result<()> {
    sqlx::query("DELETE FROM admin WHERE id = 1")
        .execute(pool)
        .await
        .map_err(DbError::Sqlx)?;
    Ok(())
}