<?php

namespace App\Http\Controllers;

use App\Http\Controllers\Concerns\SortsLists;
use App\Models\Engine;
use App\Models\Manufacturer;
use App\Models\Pump;
use App\Services\PumpService;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

/**
 * Katalog agregatow (legacy site205 / site205E) - "agregat" = pompa + przypisane
 * silniki (seg_pump_engine_rel). Uklad lista -> szczegoly (jak pozostale katalogi).
 */
class AggregateController extends Controller
{
    use SortsLists;

    private const MCF_ALL = 100;

    /** Sortowalne kolumny listy: klucz nagłówka => kolumna/alias SQL. */
    private const SORTABLE = [
        'name'    => 'PUP_NAME',
        'flow'    => 'PUP_Q_N',
        'mcf'     => 'm.MCF_NAME',
        'engines' => 'engines_count',
    ];

    public function __construct(private readonly PumpService $pumps) {}

    public function index(Request $request)
    {
        $by  = $request->query('by', 'name');
        $q   = trim((string) $request->query('q', ''));
        $mcf = (int) $request->query('mcf', self::MCF_ALL);

        [$sort, $dir] = $this->sortParams($request);

        $aggregates = Pump::query()
            ->visible()->with('manufacturer')->where('PUP_Q_N', '>', 0)
            ->select('seg_pumps.*')
            ->selectSub(
                DB::connection('softspm')->table('seg_pump_engine_rel')
                    ->whereColumn('RPE_PUP_ID', 'seg_pumps.PUP_ID')->selectRaw('count(*)'),
                'engines_count'
            )
            ->when($q !== '' && $by === 'name', fn ($w) => $w->where('PUP_NAME', 'like', '%'.$q.'%'))
            ->when($q !== '' && $by === 'flow', function ($w) use ($q) {
                $v = (float) str_replace(',', '.', $q);
                $w->whereBetween('PUP_Q_N', [$v - $v * 0.1, $v + $v * 0.1]);
            })
            ->when($mcf !== self::MCF_ALL, fn ($w) => $w->where('PUP_MCF_ID', $mcf))
            // Sortowanie po producencie wymaga joinu (relacja nie jest w FROM).
            ->when($sort === 'mcf', fn ($w) => $w
                ->leftJoin('seg_manufacturers as m', 'm.MCF_ID', '=', 'seg_pumps.PUP_MCF_ID'))
            ->when($sort !== null, fn ($w) => $w->orderBy(self::SORTABLE[$sort], $dir))
            ->orderBy('PUP_Q_N')->orderBy('PUP_NAME')
            ->paginate(20)->withQueryString();

        return view('catalog.aggregates.index', [
            'aggregates'    => $aggregates,
            'manufacturers' => Manufacturer::orderBy('MCF_NAME')->pluck('MCF_NAME', 'MCF_ID'),
            'by'            => $by, 'q' => $q, 'mcf' => $mcf, 'mcfAll' => self::MCF_ALL,
        ]);
    }

    public function show(Request $request, Pump $pump)
    {
        $pump->load('manufacturer');

        $h = $this->pumps->curve($pump, 'H');
        $eta = $this->pumps->curve($pump, 'ETA');
        $hDrawable = $this->pumps->curveDrawable($h, 0);
        $etaDrawable = $this->pumps->curveDrawable($eta, 1);

        $engines = $this->assignedEngines($pump->PUP_ID);
        $engineId = (int) $request->query('engine') ?: (int) ($engines->first()->ENG_ID ?? 0);
        $engine = $engineId && $engines->firstWhere('ENG_ID', $engineId)
            ? Engine::with('manufacturer')->find($engineId)
            : null;

        return view('catalog.aggregates.show', [
            'pump'        => $pump,
            'engines'     => $engines,
            'engine'      => $engine,
            'h'           => $h, 'eta' => $eta,
            'hDrawable'   => $hDrawable, 'etaDrawable' => $etaDrawable,
            'hPlot'       => $hDrawable ? $this->pumps->plot($h) : null,
            'etaPlot'     => $etaDrawable ? $this->pumps->plot($eta) : null,
        ]);
    }

    public function edit(Pump $pump)
    {
        $allEngines = Engine::query()->visible()->with('manufacturer')
            ->orderBy('ENG_POWER')->orderBy('ENG_NAME')->get();

        $assigned = DB::connection('softspm')->table('seg_pump_engine_rel')
            ->where('RPE_PUP_ID', $pump->PUP_ID)->pluck('RPE_ENG_ID')->all();

        return view('catalog.aggregates.edit', [
            'pump'       => $pump->load('manufacturer'),
            'allEngines' => $allEngines,
            'assigned'   => array_map('intval', $assigned),
        ]);
    }

    public function update(Request $request, Pump $pump)
    {
        $engineIds = collect($request->input('engines', []))->map(fn ($v) => (int) $v)->filter()->unique();

        DB::connection('softspm')->transaction(function () use ($pump, $engineIds) {
            DB::connection('softspm')->table('seg_pump_engine_rel')->where('RPE_PUP_ID', $pump->PUP_ID)->delete();
            foreach ($engineIds as $eid) {
                DB::connection('softspm')->table('seg_pump_engine_rel')
                    ->insert(['RPE_PUP_ID' => $pump->PUP_ID, 'RPE_ENG_ID' => $eid]);
            }
        });

        return redirect()->route('aggregates.show', $pump)
            ->with('status', 'Zaktualizowano silniki dla pompy "'.$pump->PUP_NAME.'".');
    }

    private function assignedEngines(int $pumpId)
    {
        return DB::connection('softspm')->table('seg_pump_engine_rel as r')
            ->join('seg_engines as e', 'e.ENG_ID', '=', 'r.RPE_ENG_ID')
            ->leftJoin('seg_manufacturers as m', 'm.MCF_ID', '=', 'e.ENG_MCF_ID')
            ->where('r.RPE_PUP_ID', $pumpId)
            ->select('e.ENG_ID', 'e.ENG_NAME', 'e.ENG_VOLTAGE', 'e.ENG_POWER', 'e.ENG_ETA', 'm.MCF_NAME')
            ->orderBy('e.ENG_POWER')->orderBy('e.ENG_NAME')->get();
    }
}