use crate::{
    db::Pool,
    error::{AppError, AppResult},
    models::profile::{coins_for_level, level_for_xp, pack_for_level, LevelUpEvent, Profile},
};
use chrono::Utc;

/// Fetch the active profile for a game. Single-profile-per-game: there is exactly
/// one profile row per `game_id`, so we take the earliest for that game.
pub async fn get_active_profile(pool: &Pool, game_id: &str) -> AppResult<Profile> {
    sqlx::query_as::<_, Profile>(
        "SELECT id, username, level, xp, game_id, created_at, updated_at \
         FROM profiles WHERE game_id = ? ORDER BY created_at ASC LIMIT 1",
    )
    .bind(game_id)
    .fetch_optional(pool)
    .await?
    .ok_or_else(|| AppError::NotFound("no profile exists; call POST /auth/local first".into()))
}

pub async fn create_profile(pool: &Pool, username: &str, game_id: &str) -> AppResult<Profile> {
    // Single-player per game: one profile per game_id, not one globally.
    let existing = sqlx::query_scalar::<_, i64>("SELECT COUNT(*) FROM profiles WHERE game_id = ?")
        .bind(game_id)
        .fetch_one(pool)
        .await?;
    if existing > 0 {
        return Err(AppError::Conflict(
            "a profile already exists for this game; OpenFUT is single-player per game".into(),
        ));
    }

    let profile = Profile::new(username, game_id);
    sqlx::query(
        "INSERT INTO profiles (id, username, level, xp, game_id, created_at, updated_at) \
         VALUES (?, ?, ?, ?, ?, ?, ?)",
    )
    .bind(&profile.id)
    .bind(&profile.username)
    .bind(profile.level)
    .bind(profile.xp)
    .bind(&profile.game_id)
    .bind(profile.created_at)
    .bind(profile.updated_at)
    .execute(pool)
    .await?;

    Ok(profile)
}

pub async fn add_xp(pool: &Pool, profile_id: &str, xp: i64) -> AppResult<()> {
    let now = Utc::now();
    sqlx::query("UPDATE profiles SET xp = xp + ?, updated_at = ? WHERE id = ?")
        .bind(xp)
        .bind(now)
        .bind(profile_id)
        .execute(pool)
        .await?;
    Ok(())
}

/// Add XP, check for level-ups, grant rewards, and return every level gained.
/// Callers should use this instead of `add_xp` when level-up feedback matters.
pub async fn add_xp_with_levelup(
    pool: &Pool,
    profile_id: &str,
    club_id: &str,
    xp_to_add: i64,
) -> AppResult<Vec<LevelUpEvent>> {
    let profile = sqlx::query_as::<_, Profile>(
        "SELECT id, username, level, xp, game_id, created_at, updated_at FROM profiles WHERE id = ?",
    )
    .bind(profile_id)
    .fetch_optional(pool)
    .await?
    .ok_or_else(|| AppError::NotFound(format!("profile '{profile_id}' not found")))?;
    let old_level = level_for_xp(profile.xp);
    let new_total_xp = profile.xp + xp_to_add;
    let new_level = level_for_xp(new_total_xp);

    let now = Utc::now();
    sqlx::query("UPDATE profiles SET xp = ?, level = ?, updated_at = ? WHERE id = ?")
        .bind(new_total_xp)
        .bind(new_level)
        .bind(now)
        .bind(profile_id)
        .execute(pool)
        .await?;

    let mut events = Vec::new();
    for lvl in (old_level + 1)..=new_level {
        let coins = coins_for_level(lvl);
        let pack = pack_for_level(lvl).map(String::from);

        if coins > 0 {
            crate::services::club::add_coins(pool, club_id, coins).await?;
        }
        if let Some(ref pack_id) = pack {
            crate::services::pack::grant_pack(pool, club_id, pack_id).await?;
        }

        tracing::info!(profile_id, new_level = lvl, coins, "level up");
        events.push(LevelUpEvent { new_level: lvl, coins_granted: coins, pack_granted: pack });
    }

    Ok(events)
}