<?php

namespace App\Http\Controllers;

use App\Models\Device;
use App\Models\Command;
use App\Models\CommandReceipt;
use Illuminate\Http\Request;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;

class DeviceApiController extends Controller
{
    // POST /api/device/{imei}/telemetry
    public function telemetry(Request $req, string $imei)
    {
        $data = $req->validate([
            'recorded_at'    => ['nullable','date'],
            'lat'            => ['required','numeric','between:-90,90'],
            'lng'            => ['required','numeric','between:-180,180'],
            'altitude_m'     => ['nullable','numeric'],
            'speed_kmh'      => ['nullable','numeric'],
            'heading_deg'    => ['nullable','numeric'],
            'accuracy_m'     => ['nullable','numeric'],
            'battery_percent'=> ['nullable','integer','between:0,100'],
            'is_car_on'      => ['nullable','boolean'],
            'raw'            => ['nullable'],
        ]);

        $device = Device::firstOrCreate(
            ['imei' => $imei],
            ['name' => $imei, 'is_active' => true]
        );

        $now = now();
        $recordedAt = isset($data['recorded_at'])
            ? Carbon::parse($data['recorded_at'])
            : $now;

        DB::table('device_telemetry')->insert([
            'device_id'   => $device->id,
            'recorded_at' => $recordedAt,
            'lat'         => $data['lat'],
            'lng'         => $data['lng'],
            'altitude_m'  => $data['altitude_m'] ?? null,
            'speed_kmh'   => $data['speed_kmh'] ?? null,
            'heading_deg' => $data['heading_deg'] ?? null,
            'accuracy_m'  => $data['accuracy_m'] ?? null,
            'raw'         => array_key_exists('raw', $data) ? json_encode($data['raw']) : null,
            'created_at'  => $now,
        ]);

        // Upsert status snapshot
        DB::table('device_status')->updateOrInsert(
            ['device_id' => $device->id],
            [
                'is_car_on'         => (bool)($data['is_car_on'] ?? false),
                'battery_percent'   => $data['battery_percent'] ?? null,
                'external_power'    => false,
                'reported_at'       => $now,
                'last_gps_fix_at'   => $recordedAt,
                'updated_at'        => $now,
                'sleep_interval_sec'=> DB::raw('COALESCE(sleep_interval_sec, 60)'),
            ]
        );

        $device->forceFill(['last_seen_at' => $now, 'last_ip' => $req->ip()])->save();

        return response()->json(['ok' => true], 201);
    }

    // GET /api/device/{imei}/commands?since=ISO8601
    public function commands(Request $req, string $imei)
    {
        $since = $req->query('since');

        $device = Device::where('imei', $imei)->first();
        if (!$device) {
            return response()->json(['commands' => []]);
        }

        $q = Command::where('device_id', $device->id)
            ->where('status', 'queued')
            ->where(function ($q) {
                $q->whereNull('not_before_at')->orWhere('not_before_at', '<=', now());
            })
            ->where(function ($q) {
                $q->whereNull('expires_at')->orWhere('expires_at', '>', now());
            })
            ->orderBy('priority', 'asc')
            ->orderBy('id', 'asc');

        if ($since) {
            $ts = Carbon::parse($since);
            $q->where('created_at', '>=', $ts);
        }

        $cmds = $q->limit(50)->get(['id','command_type','payload','priority','created_at']);

        // Mark as sent (optional)
        if ($cmds->count()) {
            Command::whereIn('id', $cmds->pluck('id'))->update(['status' => 'sent', 'updated_at' => now()]);
        }

        return response()->json(['commands' => $cmds]);
    }

    // POST /api/device/{imei}/command-receipts
    public function commandReceipts(Request $req, string $imei)
    {
        $device = Device::where('imei', $imei)->first();
        if (!$device) {
            return response()->json(['ok' => true], 200);
        }

        $data = $req->validate([
            'command_id'   => ['required','integer'],
            'acked_at'     => ['nullable','date'],
            'executed_at'  => ['nullable','date'],
            'result'       => ['nullable','in:ok,error'],
            'result_detail'=> ['nullable','string'],
        ]);

        CommandReceipt::create([
            'command_id'   => $data['command_id'],
            'device_id'    => $device->id,
            'acked_at'     => isset($data['acked_at']) ? Carbon::parse($data['acked_at']) : null,
            'executed_at'  => isset($data['executed_at']) ? Carbon::parse($data['executed_at']) : null,
            'result'       => $data['result'] ?? null,
            'result_detail'=> $data['result_detail'] ?? null,
        ]);

        // If execution OK, mark command acked/acked+executed
        if (!empty($data['result'])) {
            $newStatus = $data['result'] === 'ok' ? 'acked' : 'failed';
            Command::where('id', $data['command_id'])->where('device_id', $device->id)
                ->update(['status' => $newStatus, 'updated_at' => now()]);
        }

        return response()->json(['ok' => true], 200);
    }
}