use crate::domain::entities::user::User;
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use utoipa::ToSchema;
use uuid::Uuid;

#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
pub struct UserDto {
    pub id: String,
    /// Optional handle. `None` for users who have not claimed one
    /// (externals, fresh email-only signups). Frontend display callers
    /// should walk `username → given/family → email` as their fallback
    /// chain. Omitted from JSON when None (consistent with the existing
    /// given_name / family_name fields).
    #[serde(skip_serializing_if = "Option::is_none")]
    pub username: Option<String>,
    pub email: String,
    pub role: String,
    pub storage_quota_bytes: i64,
    pub storage_used_bytes: i64,
    pub created_at: DateTime<Utc>,
    pub updated_at: DateTime<Utc>,
    pub last_login_at: Option<DateTime<Utc>>,
    pub active: bool,
    pub auth_provider: String,
    pub image: Option<String>,
    pub can_edit_image: bool,
    /// `true` for grant-only external recipients (magic-link, OIDC-only,
    /// future OCM federated). External users have no home folder and
    /// can't own storage; their quota is always 0. Internal users
    /// default to `false`.
    pub is_external: bool,
    /// Optional first/given name. Populated from the OIDC `given_name`
    /// claim at JIT provisioning, or via a profile-edit endpoint.
    /// `None` until explicitly set — `skip_serializing_if = "Option::is_none"`
    /// keeps the wire format compact for the common case.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub given_name: Option<String>,
    /// Optional last/family name. Same provenance + serde rules as
    /// `given_name`.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub family_name: Option<String>,
}

impl From<User> for UserDto {
    fn from(user: User) -> Self {
        Self {
            id: user.id().to_string(),
            username: user.username().map(str::to_string),
            email: user.email().to_string(),
            role: format!("{}", user.role()),
            storage_quota_bytes: user.storage_quota_bytes(),
            storage_used_bytes: user.storage_used_bytes(),
            created_at: user.created_at(),
            updated_at: user.updated_at(),
            last_login_at: user.last_login_at(),
            active: user.is_active(),
            auth_provider: user.oidc_provider().unwrap_or("local").to_string(),
            image: user.image().map(|s| s.to_string()),
            can_edit_image: !user.is_oidc_user(),
            is_external: user.is_external(),
            given_name: user.given_name().map(str::to_string),
            family_name: user.family_name().map(str::to_string),
        }
    }
}

#[derive(Debug, Serialize, Deserialize, Clone, ToSchema)]
pub struct LoginDto {
    pub username: String,
    pub password: String,
}

#[derive(Debug, Serialize, Deserialize, Clone, ToSchema)]
pub struct RegisterDto {
    pub username: String,
    pub email: String,
    pub password: String,
}

/// DTO for the one-time initial admin setup endpoint (`/api/setup`).
/// Available only when the system is not yet initialized (no admin exists).
#[derive(Debug, Serialize, Deserialize, Clone, ToSchema)]
pub struct SetupAdminDto {
    pub username: String,
    pub email: String,
    pub password: String,
}

#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
pub struct AuthResponseDto {
    pub user: UserDto,
    pub access_token: String,
    pub refresh_token: String,
    pub token_type: String,
    pub expires_in: i64,
}

#[derive(Debug, Serialize, Deserialize, ToSchema)]
pub struct ChangePasswordDto {
    pub current_password: String,
    pub new_password: String,
}

#[derive(Debug, Serialize, Deserialize, ToSchema)]
pub struct RefreshTokenDto {
    pub refresh_token: String,
}

/// Authenticated current user data (for use in application services)
#[derive(Clone, Debug, Serialize, Deserialize, ToSchema)]
pub struct CurrentUser {
    pub id: Uuid,
    pub username: String,
    pub email: String,
    pub role: String,
}

// ============================================================================
// App Password DTOs
// ============================================================================

#[derive(Debug, Serialize, Deserialize, ToSchema)]
pub struct CreateAppPasswordDto {
    pub label: String,
}

#[derive(Debug, Serialize, Deserialize, ToSchema)]
pub struct AppPasswordCreatedDto {
    pub id: String,
    pub label: String,
    pub password: String,
}

#[derive(Debug, Serialize, Deserialize, ToSchema)]
pub struct AppPasswordDto {
    pub id: String,
    pub label: String,
    pub created_at: DateTime<Utc>,
    pub last_used_at: Option<DateTime<Utc>>,
}

// ============================================================================
// OIDC DTOs
// ============================================================================

/// Response with the OIDC authorization URL for client redirect
#[derive(Debug, Serialize, Deserialize, ToSchema)]
pub struct OidcAuthorizeResponseDto {
    pub authorize_url: String,
    pub state: String,
}

/// Query parameters received on the OIDC callback
#[derive(Debug, Serialize, Deserialize, ToSchema)]
pub struct OidcCallbackQueryDto {
    pub code: String,
    pub state: String,
}

/// Request body for the OIDC one-time code exchange endpoint
#[derive(Debug, Serialize, Deserialize, ToSchema)]
pub struct OidcExchangeDto {
    pub code: String,
}

/// Information about available OIDC providers
#[derive(Debug, Serialize, Deserialize, ToSchema)]
pub struct OidcProviderInfoDto {
    pub enabled: bool,
    pub provider_name: String,
    pub authorize_endpoint: String,
    pub password_login_enabled: bool,
}

/// Claims extracted from the validated OIDC ID token
#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
pub struct OidcUserInfoDto {
    pub sub: String,
    pub preferred_username: Option<String>,
    pub email: Option<String>,
    pub name: Option<String>,
    pub groups: Vec<String>,
}