use crate::extractors::GameId;
use axum::{
    extract::{Path, State},
    Json,
};
use serde::Deserialize;
use serde_json::{json, Value};

use crate::{
    app::AppState,
    error::AppResult,
    models::pack::PackOpenResult,
    services::{club as club_svc, objective, pack as pack_svc, profile as profile_svc, statistics},
};

#[derive(Deserialize)]
pub struct BuyPackRequest {
    pub pack_definition_id: String,
}

pub async fn post_buy_pack(
    State(state): State<AppState>,
    game: GameId,
    Json(req): Json<BuyPackRequest>,
) -> AppResult<Json<Value>> {
    let profile = profile_svc::get_active_profile(&state.pool, game.as_str()).await?;
    let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;
    let pack = pack_svc::buy_pack(
        &state.pool,
        &state.pack_defs,
        &club.id,
        &req.pack_definition_id,
    )
    .await?;
    Ok(Json(
        json!({ "pack": pack, "message": "Pack purchased successfully" }),
    ))
}

/// List all purchasable pack definitions with their coin costs.
pub async fn get_pack_store(State(state): State<AppState>) -> AppResult<Json<Value>> {
    let store: Vec<Value> = state
        .pack_defs
        .iter()
        .map(|d| {
            let total_cards: u8 = d.slots.iter().map(|s| s.count).sum();
            json!({
                "id": d.id,
                "name": d.name,
                "description": d.description,
                "cost_coins": d.cost_coins,
                "total_cards": total_cards,
            })
        })
        .collect();
    Ok(Json(json!({ "packs": store })))
}

pub async fn get_packs(State(state): State<AppState>, game: GameId) -> AppResult<Json<Value>> {
    let profile = profile_svc::get_active_profile(&state.pool, game.as_str()).await?;
    let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;
    let packs = pack_svc::get_unopened_packs(&state.pool, &club.id).await?;

    let with_defs: Vec<Value> = packs
        .iter()
        .map(|p| {
            let def = state.pack_defs.iter().find(|d| d.id == p.definition_id);
            json!({
                "pack_id": p.id,
                "definition_id": p.definition_id,
                "name": def.map(|d| &d.name),
                "description": def.map(|d| &d.description),
                "created_at": p.created_at,
            })
        })
        .collect();

    Ok(Json(json!({ "packs": with_defs })))
}

/// Return recently opened packs with the card IDs they contained.
pub async fn get_pack_history(State(state): State<AppState>, game: GameId) -> AppResult<Json<Value>> {
    let profile = profile_svc::get_active_profile(&state.pool, game.as_str()).await?;
    let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;

    let opened = sqlx::query_as::<_, crate::models::pack::Pack>(
        "SELECT id, club_id, definition_id, opened, created_at, opened_cards, opened_at \
         FROM packs WHERE club_id = ? AND opened = 1 ORDER BY opened_at DESC LIMIT 50",
    )
    .bind(&club.id)
    .fetch_all(&state.pool)
    .await?;

    let history: Vec<Value> = opened
        .iter()
        .map(|p| {
            let def = state.pack_defs.iter().find(|d| d.id == p.definition_id);
            // Expand card_ids into full card definitions
            let cards: Vec<Value> = p
                .opened_cards
                .as_deref()
                .and_then(|s| serde_json::from_str::<Vec<String>>(s).ok())
                .unwrap_or_default()
                .iter()
                .map(|id| {
                    json!({
                        "card_id": id,
                        "card": state.card_db.get(id),
                    })
                })
                .collect();
            json!({
                "pack_id": p.id,
                "definition_id": p.definition_id,
                "name": def.map(|d| &d.name),
                "opened_at": p.opened_at,
                "cards": cards,
            })
        })
        .collect();

    Ok(Json(json!({ "history": history, "total": history.len() })))
}

pub async fn post_open_pack(
    State(state): State<AppState>,
    game: GameId,
    Path(pack_id): Path<String>,
) -> AppResult<Json<PackOpenResult>> {
    let profile = profile_svc::get_active_profile(&state.pool, game.as_str()).await?;
    let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;

    let result = pack_svc::open_pack(
        &state.pool,
        &state.card_db,
        &state.pack_defs,
        &club.id,
        &pack_id,
    )
    .await?;

    statistics::increment_packs_opened(&state.pool, &profile.id).await?;
    objective::increment_metric(&state.pool, &profile.id, &state.obj_defs, "packsopened", 1)
        .await?;
    let _ = crate::services::achievement::check_and_unlock(
        &state.pool, &state.achievement_defs, &profile.id, &club.id,
    ).await;

    Ok(Json(result))
}