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

use crate::{
    app::AppState,
    error::AppResult,
    services::{club as club_svc, fut_champs as champs_svc, profile as profile_svc, season as season_svc},
};

/// GET /fut-champs — current active session, or null if none.
pub async fn get_fut_champs(State(state): State<AppState>) -> AppResult<Json<Value>> {
    let profile = profile_svc::get_active_profile(&state.pool).await?;
    let session = champs_svc::get_active_session(&state.pool, &profile.id).await?;

    Ok(Json(json!({
        "session": session,
        "max_matches": crate::models::fut_champs::MAX_MATCHES,
    })))
}

/// POST /fut-champs/start — open a new FUT Champions week.
pub async fn post_start_fut_champs(State(state): State<AppState>) -> AppResult<Json<Value>> {
    let profile = profile_svc::get_active_profile(&state.pool).await?;
    let session = champs_svc::start_session(&state.pool, &profile.id).await?;

    Ok(Json(json!({
        "session": session,
        "message": "FUT Champions week started — play up to 30 matches",
    })))
}

#[derive(Deserialize)]
pub struct ChampsMatchRequest {
    pub goals_for: i64,
    pub goals_against: i64,
}

/// POST /fut-champs/:session_id/result — record a match in this session.
pub async fn post_champs_result(
    State(state): State<AppState>,
    Path(session_id): Path<String>,
    Json(req): Json<ChampsMatchRequest>,
) -> AppResult<Json<Value>> {
    let profile = profile_svc::get_active_profile(&state.pool).await?;

    let session = champs_svc::record_match(
        &state.pool,
        &profile.id,
        &session_id,
        req.goals_for,
        req.goals_against,
    )
    .await?;

    let outcome = if req.goals_for > req.goals_against {
        "win"
    } else if req.goals_for == req.goals_against {
        "draw"
    } else {
        "loss"
    };

    Ok(Json(json!({
        "session": session,
        "outcome": outcome,
        "matches_remaining": session.matches_remaining(),
        "auto_completed": session.is_complete(),
    })))
}

/// POST /fut-champs/:session_id/claim — claim end-of-week rewards.
pub async fn post_claim_champs_rewards(
    State(state): State<AppState>,
    Path(session_id): Path<String>,
) -> AppResult<Json<Value>> {
    let profile = profile_svc::get_active_profile(&state.pool).await?;
    let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;

    let result = champs_svc::claim_rewards(
        &state.pool,
        &profile.id,
        &session_id,
        &club.id,
        &state.pack_defs,
    )
    .await?;

    Ok(Json(result))
}

/// GET /fut-champs/history — past sessions, newest first.
pub async fn get_champs_history(State(state): State<AppState>) -> AppResult<Json<Value>> {
    let profile = profile_svc::get_active_profile(&state.pool).await?;
    let history = champs_svc::get_history(&state.pool, &profile.id).await?;

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

/// POST /rivals/claim-weekly — claim weekly Division Rivals reward.
pub async fn post_claim_rivals_reward(State(state): State<AppState>) -> AppResult<Json<Value>> {
    let profile = profile_svc::get_active_profile(&state.pool).await?;
    let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;

    // Ensure a season row exists
    season_svc::get_or_create(&state.pool, &profile.id).await?;

    let result = champs_svc::claim_rivals_reward(
        &state.pool,
        &profile.id,
        &club.id,
        &state.pack_defs,
    )
    .await?;

    Ok(Json(result))
}