<?php

namespace App\Http\Controllers;

use App\Models\Workout;
use App\Models\WorkoutExercise;
use App\Models\WorkoutSession;
use App\Models\WorkoutSessionItem;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\View\View;

class WorkoutSessionController extends Controller
{
    public function store(Request $request, Workout $workout): RedirectResponse
    {
        $this->authorizeWorkout($workout);

        $session = WorkoutSession::create([
            'user_id' => Auth::id(),
            'workout_id' => $workout->id,
            'started_at' => now(),
        ]);

        // Pre-create items for convenience
        $workout->loadMissing('items');
        foreach ($workout->items as $item) {
            WorkoutSessionItem::create([
                'session_id' => $session->id,
                'workout_exercise_id' => $item->id,
                'done' => false,
            ]);
        }

        return redirect()->route('sessions.show', $session);
    }

    public function show(WorkoutSession $session): View
    {
        $this->authorizeSession($session);
        $session->load(['workout.items.exercise', 'items']);

        // Index session items by workout_exercise_id for quick lookup
        $doneByItemId = $session->items->keyBy('workout_exercise_id');

        return view('workouts.session', [
            'session' => $session,
            'workout' => $session->workout,
            'doneByItemId' => $doneByItemId,
        ]);
    }

    public function toggleItem(Request $request, WorkoutSession $session, WorkoutExercise $item): RedirectResponse
    {
        $this->authorizeSession($session);
        if ($item->workout_id !== $session->workout_id) {
            abort(404);
        }

        $data = $request->validate([
            'actual_weight' => ['nullable', 'numeric', 'min:0', 'max:9999.99'],
            'actual_reps' => ['nullable', 'integer', 'min:0', 'max:1000'],
        ]);

        $si = WorkoutSessionItem::firstOrCreate([
            'session_id' => $session->id,
            'workout_exercise_id' => $item->id,
        ], [
            'done' => false,
        ]);

        $si->done = !$si->done;
        if ($si->done) {
            if (array_key_exists('actual_weight', $data) && $data['actual_weight'] !== null) {
                $si->actual_weight = $data['actual_weight'];
            }
            if (array_key_exists('actual_reps', $data) && $data['actual_reps'] !== null) {
                $si->actual_reps = $data['actual_reps'];
            }
        }
        $si->save();

        return back();
    }

    public function complete(WorkoutSession $session): RedirectResponse
    {
        $this->authorizeSession($session);
        $session->completed_at = now();
        $session->save();
        return redirect()->route('workouts.show', $session->workout)->with('status', __('app.sessions.completed'));
    }

    protected function authorizeWorkout(Workout $workout): void
    {
        if ($workout->user_id !== Auth::id()) {
            abort(403);
        }
    }

    protected function authorizeSession(WorkoutSession $session): void
    {
        if ($session->user_id !== Auth::id()) {
            abort(403);
        }
    }
}