<?php

namespace App\Services;

use App\Models\Schedule;
use App\Models\Provider;
use App\Models\ProviderBlockedDay;
use App\Models\ProviderWorkingDay;
use Carbon\Carbon;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

class ScheduleService
{
    public function getAll()
    {
        return Schedule::with(['client.user', 'provider.user', 'address'])
            ->where('schedule_type', 'default')
            ->orderBy('date', 'desc')
            ->orderBy('start_time', 'desc')
            ->get();
    }

    public function getById($id)
    {
        return Schedule::with(['client.user', 'provider.user', 'address'])->findOrFail($id);
    }

    public function create(array $data)
    {
        $data['code'] = str_pad(random_int(0, 9999), 4, '0', STR_PAD_LEFT);
        
        $provider = Provider::findOrFail($data['provider_id']);
        $data['total_amount'] = $this->calculateAmount($provider, $data['period_type']);

        $this->validateProviderAvailability($data);

        return Schedule::create($data);
    }

    public function createMultiple(array $baseData, array $schedules)
    {
        foreach ($schedules as $schedule) {
            $validationData = array_merge($baseData, $schedule);
            try {
                $this->validateProviderAvailability($validationData);
            } catch (\Exception $e) {
                throw new \Exception("Prestador não disponível para a data " . Carbon::parse($schedule['date'])->format('d/m/Y') . ": " . $e->getMessage());
            }
        }

        $createdSchedules = [];
        
        foreach ($schedules as $schedule) {
            $scheduleData = array_merge($baseData, $schedule, [
                'code' => str_pad(random_int(0, 9999), 4, '0', STR_PAD_LEFT),
            ]);
            
            $createdSchedules[] = Schedule::create($scheduleData);
        }

        return $createdSchedules;
    }

    public function update($id, array $data)
    {
        $schedule = Schedule::findOrFail($id);

        if (isset($data['provider_id']) || isset($data['period_type'])) {
            $providerId = $data['provider_id'] ?? $schedule->provider_id;
            $periodType = $data['period_type'] ?? $schedule->period_type;
            $provider = Provider::findOrFail($providerId);
            $data['total_amount'] = $this->calculateAmount($provider, $periodType);
        }

        if (isset($data['date']) || isset($data['start_time']) || isset($data['provider_id'])) {
            $validationData = array_merge($schedule->toArray(), $data);
            $this->validateProviderAvailability($validationData, $id);
        }

        $schedule->update($data);
        return $schedule->fresh(['client.user', 'provider.user', 'address']);
    }

    public function delete($id)
    {
        $schedule = Schedule::findOrFail($id);
        $schedule->delete();
        return $schedule;
    }

    private function calculateAmount(Provider $provider, string $periodType): float
    {
        $hourlyRates = [
            '2' => $provider->daily_price_2h ?? 0,
            '4' => $provider->daily_price_4h ?? 0,
            '6' => $provider->daily_price_6h ?? 0,
            '8' => $provider->daily_price_8h ?? 0,
        ];

        return $hourlyRates[$periodType] ?? 0;
    }

    private function validateProviderAvailability(array $data, $excludeScheduleId = null)
    {
        $provider = Provider::findOrFail($data['provider_id']);
        $date = Carbon::parse($data['date']);
        $startTime = $data['start_time'];
        $endTime = $data['end_time'];
        
        $dayOfWeek = $date->dayOfWeek;

        $startHour = (int) substr($startTime, 0, 2);
        $period = $startHour < 12 ? 'morning' : 'afternoon';

        $workingDay = ProviderWorkingDay::where('provider_id', $data['provider_id'])
            ->where('day', $dayOfWeek)
            ->where('period', $period)
            ->first();

        if (!$workingDay) {
            throw new \Exception("Prestador não trabalha neste dia/período.");
        }

        $blockedDay = ProviderBlockedDay::where('provider_id', $data['provider_id'])
            ->where('date', $date->format('Y-m-d'))
            ->where(function ($query) use ($startTime, $endTime) {
                $query->where('period', 'full')
                    ->orWhere(function ($q) use ($startTime, $endTime) {
                        $q->where('period', 'partial')
                            ->where(function ($q2) use ($startTime, $endTime) {
                                $q2->whereBetween('init_hour', [$startTime, $endTime])
                                    ->orWhereBetween('end_hour', [$startTime, $endTime])
                                    ->orWhere(function ($q3) use ($startTime, $endTime) {
                                        $q3->where('init_hour', '<=', $startTime)
                                            ->where('end_hour', '>=', $endTime);
                                    });
                            });
                    });
            })
            ->first();

        if ($blockedDay) {
            throw new \Exception("Prestador possui bloqueio neste dia/horário.");
        }

        $conflictingSchedule = Schedule::where('provider_id', $data['provider_id'])
            ->where('date', $date->format('Y-m-d'))
            ->whereIn('status', ['pending', 'accepted', 'paid', 'started'])
            ->where(function ($query) use ($startTime, $endTime) {
                $query->whereBetween('start_time', [$startTime, $endTime])
                    ->orWhereBetween('end_time', [$startTime, $endTime])
                    ->orWhere(function ($q) use ($startTime, $endTime) {
                        $q->where('start_time', '<=', $startTime)
                            ->where('end_time', '>=', $endTime);
                    });
            })
            ->when($excludeScheduleId, function ($query) use ($excludeScheduleId) {
                $query->where('id', '!=', $excludeScheduleId);
            })
            ->first();

        if ($conflictingSchedule) {
            throw new \Exception("Prestador já possui agendamento neste horário.");
        }

        return true;
    }

    public function getGroupedByClient()
    {
        $schedules = Schedule::with(['client.user', 'provider.user', 'address'])
            // ->orderBy('date', 'desc')
            ->orderBy('id', 'desc')
            ->select(
                'schedules.*'
                
            )
            ->get();

        $grouped = $schedules->groupBy('client_id')->map(function ($clientSchedules) {
            $firstSchedule = $clientSchedules->first();
            return [
                'client_id' => $firstSchedule->client_id,
                'client_name' => $firstSchedule->client->user->name ?? 'N/A',
                'schedules' => $clientSchedules->map(function ($schedule) {
                    return [
                        'id' => $schedule->id,
                        'date' => $schedule->date ? Carbon::parse($schedule->date)->format('d/m/Y') : null,
                        'start_time' => $schedule->start_time,
                        'end_time' => $schedule->end_time,
                        'period_type' => $schedule->period_type,
                        'status' => $schedule->status,
                        'total_amount' => $schedule->total_amount,
                        'code' => $schedule->code,
                        'code_verified' => $schedule->code_verified,
                        'provider_id' => $schedule->provider_id,
                        'provider_name' => $schedule->provider->user->name ?? 'N/A',
                        'address' => $schedule->address ? [
                            'id' => $schedule->address->id,
                            'address' => $schedule->address->address,
                            'complement' => $schedule->address->complement,
                            'zip_code' => $schedule->address->zip_code,
                            'city' => $schedule->address->city->name ?? '',
                            'state' => $schedule->address->city->state->name ?? '',
                        ] : null,
                        'client_name' => $schedule->client->user->name ?? 'N/A',
                    ];
                })->values()
            ];
        })->sortBy('id')->values();

        return $grouped;
    }

    public function updateStatus($id, string $status)
    {
        $schedule = Schedule::findOrFail($id);
        
        $allowedTransitions = [
            'pending' => ['accepted', 'rejected'],
            'accepted' => ['paid', 'cancelled'],
            'paid' => ['cancelled', 'started'],
            'started' => ['finished'],
            'rejected' => [],
            'cancelled' => [],
            'finished' => [],
        ];

        $currentStatus = $schedule->status;
        
        if (!isset($allowedTransitions[$currentStatus])) {
            throw new \Exception("Status atual inválido.");
        }

        if (!in_array($status, $allowedTransitions[$currentStatus])) {
            throw new \Exception("Transição de status não permitida: {$currentStatus} → {$status}");
        }

        $schedule->update(['status' => $status]);
        return $schedule->fresh(['client.user', 'provider.user', 'address']);
    }
}