<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Tenant\WorkOrder;
use App\Models\Tenant\WorkOrderWork;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

class MechanicApiController extends Controller
{
    /** GET /api/v1/mechanic/board — only OWN WOs with their works expanded. */
    public function board(): JsonResponse
    {
        $userId = auth()->id();
        $wos = WorkOrder::with(['client:id,name', 'vehicle:id,plate,make,model', 'works'])
            ->where('master_id', $userId)
            ->whereNotIn('status', ['done', 'cancelled'])
            ->orderBy('opened_at')
            ->get()
            ->map(fn ($wo) => [
                'id' => $wo->id, 'number' => $wo->number, 'status' => $wo->status,
                'client_name' => $wo->client?->name,
                'vehicle' => trim(($wo->vehicle?->make ?? '') . ' ' . ($wo->vehicle?->model ?? '')),
                'plate' => $wo->vehicle?->plate,
                'complaint' => $wo->complaint,
                'eta_at' => $wo->eta_at?->toIso8601String(),
                'works' => $wo->works->map(fn ($w) => $this->workPayload($w))->all(),
            ]);
        return response()->json(['data' => $wos]);
    }

    /** POST /api/v1/mechanic/tasks/{work}/start */
    public function startTask(WorkOrderWork $work): JsonResponse
    {
        $this->authorizeOwn($work);
        $work->start();
        return response()->json(['data' => $this->workPayload($work->fresh())]);
    }

    public function pauseTask(WorkOrderWork $work): JsonResponse
    {
        $this->authorizeOwn($work);
        $work->pause();
        return response()->json(['data' => $this->workPayload($work->fresh())]);
    }

    public function resumeTask(WorkOrderWork $work): JsonResponse
    {
        $this->authorizeOwn($work);
        $work->resume();
        return response()->json(['data' => $this->workPayload($work->fresh())]);
    }

    public function doneTask(WorkOrderWork $work): JsonResponse
    {
        $this->authorizeOwn($work);
        $work->markDone();
        return response()->json(['data' => $this->workPayload($work->fresh())]);
    }

    public function blockTask(Request $request, WorkOrderWork $work): JsonResponse
    {
        $this->authorizeOwn($work);
        $data = $request->validate([
            'reason' => 'required|in:' . implode(',', array_keys(WorkOrderWork::BLOCK_REASONS)),
            'note' => 'nullable|string|max:1000',
        ]);
        $work->block($data['reason'], $data['note'] ?? null);
        return response()->json(['data' => $this->workPayload($work->fresh())]);
    }

    /** GET /api/v1/mechanic/kpi?period=2026-06 — own efficiency aggregates. */
    public function kpi(Request $request): JsonResponse
    {
        $userId = auth()->id();
        $period = $request->query('period', now()->format('Y-m'));
        [$y, $m] = explode('-', $period);

        $rows = WorkOrderWork::whereHas('workOrder', fn ($q) => $q->where('master_id', $userId))
            ->where('mechanic_status', 'done')
            ->whereYear('mechanic_done_at', $y)
            ->whereMonth('mechanic_done_at', $m)
            ->get();

        $totalNorm = (float) $rows->sum('hours');
        $totalActual = (float) $rows->sum('actual_hours');
        $tasksDone = $rows->count();
        $totalRevenue = (float) $rows->sum('total');
        $efficiencyPct = $totalNorm > 0 ? round(100 * $totalActual / $totalNorm) : null;

        return response()->json([
            'period' => $period,
            'tasks_done' => $tasksDone,
            'norm_hours' => round($totalNorm, 2),
            'actual_hours' => round($totalActual, 2),
            'efficiency_pct' => $efficiencyPct,
            'revenue_manopere' => round($totalRevenue, 2),
        ]);
    }

    private function workPayload(WorkOrderWork $w): array
    {
        return [
            'id' => $w->id,
            'name' => $w->name,
            'mechanic_status' => $w->mechanic_status,
            'norm_hours' => (float) $w->hours,
            'actual_hours' => (float) $w->actual_hours,
            'efficiency_pct' => $w->efficiencyPct(),
            'efficiency_class' => $w->efficiencyClass(),
            'block_reason' => $w->block_reason,
            'block_note' => $w->block_note,
            'mechanic_started_at' => $w->mechanic_started_at?->toIso8601String(),
            'mechanic_done_at' => $w->mechanic_done_at?->toIso8601String(),
        ];
    }

    private function authorizeOwn(WorkOrderWork $work): void
    {
        if ($work->workOrder?->master_id !== auth()->id()) {
            abort(403, 'Work belongs to a different mechanic.');
        }
    }
}