//! User model and related types.

use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use uuid::Uuid;

/// User role enum matching the Postgres `user_role` CHECK constraint.
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum UserRole {
    User,
    Admin,
}

impl UserRole {
    /// Convert from database string representation.
    pub fn from_db(s: &str) -> Self {
        match s {
            "admin" => UserRole::Admin,
            _ => UserRole::User,
        }
    }

    /// Convert to database string representation.
    pub fn as_str(&self) -> &'static str {
        match self {
            UserRole::User => "user",
            UserRole::Admin => "admin",
        }
    }
}

impl std::fmt::Display for UserRole {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.as_str())
    }
}

/// A user record from the database.
#[derive(Debug, Clone, Serialize)]
pub struct User {
    pub id: Uuid,
    pub email: String,
    pub display_name: Option<String>,
    pub role: UserRole,
    pub created_at: DateTime<Utc>,
    pub updated_at: DateTime<Utc>,
}

/// Response shape for `GET /api/v1/auth/me`.
#[derive(Debug, Serialize)]
pub struct MeResponse {
    pub id: Uuid,
    pub email: String,
    pub display_name: Option<String>,
    pub role: String,
    pub created_at: DateTime<Utc>,
}