use serde::{Deserialize, Serialize};
use sqlx::FromRow;

// ---------------------------------------------------------------------------
// Database models
// ---------------------------------------------------------------------------

#[derive(Debug, FromRow)]
#[allow(dead_code)]
pub struct User {
    pub id: String,
    pub username: String,
    pub email: String,
    pub password_hash: String,
    pub created_at: String,
}

#[derive(Debug, FromRow)]
#[allow(dead_code)]
pub struct Progress {
    pub user_id: String,
    pub topic_id: String,
    pub lesson_id: String,
    pub completed: i32,
    pub best_score: i32,
    pub completed_at: Option<String>,
}

#[derive(Debug, FromRow)]
#[allow(dead_code)]
pub struct UserStats {
    pub user_id: String,
    pub xp: i32,
    pub streak_days: i32,
    pub last_active_date: Option<String>,
    pub hearts: i32,
    pub streak_freezes: i32,
}

#[derive(Debug, FromRow)]
#[allow(dead_code)]
pub struct LessonState {
    pub user_id: String,
    pub topic_id: String,
    pub lesson_id: String,
    pub current_index: i32,
    pub hearts: i32,
    pub correct_count: i32,
    pub updated_at: String,
}

// ---------------------------------------------------------------------------
// Request DTOs
// ---------------------------------------------------------------------------

#[derive(Debug, Deserialize)]
pub struct RegisterRequest {
    pub username: String,
    pub email: String,
    pub password: String,
}

#[derive(Debug, Deserialize)]
pub struct LoginRequest {
    pub email: String,
    pub password: String,
}

#[derive(Debug, Deserialize)]
pub struct ProgressUpdateRequest {
    pub topic_id: String,
    pub lesson_id: String,
    pub score: i32,
    pub xp_earned: i32,
}

#[derive(Debug, Deserialize)]
pub struct LessonStateSaveRequest {
    pub topic_id: String,
    pub lesson_id: String,
    pub current_index: i32,
    pub hearts: i32,
    pub correct_count: i32,
}

// ---------------------------------------------------------------------------
// Response DTOs
// ---------------------------------------------------------------------------

#[derive(Debug, Serialize)]
pub struct AuthResponse {
    pub token: String,
    pub user: UserResponse,
}

#[derive(Debug, Serialize)]
pub struct UserResponse {
    pub id: String,
    pub username: String,
    pub email: String,
}

#[derive(Debug, Serialize)]
pub struct MeResponse {
    pub user: UserResponse,
    pub stats: StatsResponse,
}

#[derive(Debug, Serialize, Clone)]
pub struct StatsResponse {
    pub xp: i32,
    pub streak_days: i32,
    pub hearts: i32,
    pub streak_freezes: i32,
}

#[derive(Debug, Serialize)]
pub struct ProgressResponse {
    pub lessons: Vec<LessonProgress>,
    pub stats: StatsResponse,
}

#[derive(Debug, Serialize)]
pub struct LessonProgress {
    pub topic_id: String,
    pub lesson_id: String,
    pub completed: bool,
    pub best_score: i32,
    pub completed_at: Option<String>,
}

#[derive(Debug, Serialize)]
pub struct LessonStateResponse {
    pub topic_id: String,
    pub lesson_id: String,
    pub current_index: i32,
    pub hearts: i32,
    pub correct_count: i32,
}

// ---------------------------------------------------------------------------
// Push notification DTOs
// ---------------------------------------------------------------------------

#[derive(Debug, Deserialize)]
pub struct PushSubscribeRequest {
    pub endpoint: String,
    pub p256dh: String,
    pub auth: String,
}

#[derive(Debug, Deserialize)]
pub struct PushPreferencesRequest {
    pub reminder_enabled: bool,
    pub reminder_time: String,
}

#[derive(Debug, Serialize)]
pub struct PushPreferencesResponse {
    pub reminder_enabled: bool,
    pub reminder_time: String,
}