<?php

namespace App\Http\Controllers;

use App\Models\Program;
use App\Models\WorkoutSession;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\View\View;

class ProgramController extends Controller
{
    public function index(): View
    {
        $programs = Auth::user()->programs()->withCount('workouts')->latest()->paginate(10);

        return view('programs.index', compact('programs'));
    }

    public function create(): View
    {
        return view('programs.create');
    }

    public function store(Request $request): RedirectResponse
    {
        $data = $request->validate([
            'title' => ['required', 'string', 'max:255'],
            'description' => ['nullable', 'string'],
            'weeks' => ['required', 'integer', 'min:1', 'max:52'],
        ]);

        $program = Auth::user()->programs()->create($data);

        return redirect()->route('programs.show', $program)->with('status', 'Program created');
    }

    public function show(Program $program): View
    {
        $this->authorizeProgram($program);
        $program->load('workouts');

        $completedWorkoutIds = WorkoutSession::query()
            ->where('user_id', Auth::id())
            ->whereIn('workout_id', $program->workouts->pluck('id'))
            ->whereNotNull('completed_at')
            ->pluck('workout_id')
            ->unique();

        $workoutsByWeek = $program->workouts->groupBy('week_number');

        $totalWorkouts = $program->workouts->count();
        $completedCount = $completedWorkoutIds->count();
        $progressPct = $totalWorkouts > 0 ? (int) round(($completedCount / $totalWorkouts) * 100) : 0;

        return view('programs.show', [
            'program' => $program,
            'workoutsByWeek' => $workoutsByWeek,
            'completedWorkoutIds' => $completedWorkoutIds,
            'progressPct' => $progressPct,
            'completedCount' => $completedCount,
            'totalWorkouts' => $totalWorkouts,
        ]);
    }

    public function destroy(Program $program): RedirectResponse
    {
        $this->authorizeProgram($program);
        $program->delete();

        return redirect()->route('programs.index')->with('status', 'Program deleted');
    }

    public function addWorkout(Request $request, Program $program): RedirectResponse
    {
        $this->authorizeProgram($program);
        $data = $request->validate([
            'title' => ['required', 'string', 'max:255'],
            'week_number' => ['required', 'integer', 'min:1', 'max:' . $program->weeks],
            'day_number' => ['required', 'integer', 'min:1', 'max:14'],
            'estimated_minutes' => ['nullable', 'integer', 'min:1', 'max:600'],
        ]);

        $program->workouts()->create([
            'user_id' => Auth::id(),
            'title' => $data['title'],
            'estimated_minutes' => $data['estimated_minutes'] ?? null,
            'week_number' => $data['week_number'],
            'day_number' => $data['day_number'],
        ]);

        return back()->with('status', 'Workout added to program');
    }

    protected function authorizeProgram(Program $program): void
    {
        if ($program->user_id !== Auth::id()) {
            abort(403);
        }
    }
}