<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Carbon;
use Inertia\Inertia;
use Inertia\Response;

class StatsController extends Controller
{
    public function index(Request $request): Response
    {
        $user = $request->user();
        $period = $request->string('period', 'week')->toString();

        [$from, $bucket, $format] = match ($period) {
            'day' => [Carbon::today(), 'hour', 'H\h'],
            'month' => [Carbon::now()->subDays(30), 'day', 'D'],
            'quarter' => [Carbon::now()->subDays(90), 'week', '\SW'],
            default => [Carbon::now()->subDays(7), 'day', 'ddd'],
        };

        $rows = $user->measurements()
            ->where('measured_at', '>=', $from)
            ->orderBy('measured_at')
            ->get();

        $points = $rows->groupBy(fn ($m) => match ($bucket) {
            'hour' => $m->measured_at->format('H'),
            'day' => $m->measured_at->format('Y-m-d'),
            'week' => $m->measured_at->isoWeek(),
        })->map(function ($group) use ($format) {
            $first = $group->first();
            return [
                'l' => $first->measured_at->locale('fr')->isoFormat($format === 'ddd' ? 'dd' : ($format === '\SW' ? '[S]W' : ($format === 'D' ? 'D' : 'HH'))),
                'v' => (int) round($group->avg('value')),
            ];
        })->values();

        $inRange = $rows->filter(fn ($m) => $m->value >= $user->target_min && $m->value <= $user->target_max);
        $stats = [
            'avg' => $rows->count() ? (int) round($rows->avg('value')) : null,
            'in_range_pct' => $rows->count() ? (int) round(($inRange->count() / $rows->count()) * 100) : 0,
            'min' => $rows->min('value') !== null ? (int) $rows->min('value') : null,
            'max' => $rows->max('value') !== null ? (int) $rows->max('value') : null,
        ];

        $history = $user->measurements()
            ->orderByDesc('measured_at')
            ->limit(8)
            ->get()
            ->map(fn ($m) => [
                'id' => $m->id,
                'time' => $m->measured_at->isoFormat('HH:mm'),
                'value' => (int) $m->value,
                'context' => match ($m->context) {
                    'fasting' => 'À jeun',
                    'before_meal' => 'Avant repas',
                    'after_meal' => 'Après repas',
                    'bedtime' => 'Coucher',
                    default => 'Autre',
                },
                'in_range' => $m->isInRange($user->target_min, $user->target_max),
            ]);

        return Inertia::render('Diabetix/Stats', [
            'period' => $period,
            'points' => $points,
            'stats' => $stats,
            'history' => $history,
            'target' => ['min' => (int) $user->target_min, 'max' => (int) $user->target_max],
        ]);
    }
}