<?php

namespace App\Services\Wallet;

use App\Models\Tenant;
use App\Models\User;
use App\Models\Wallet;
use App\Models\WalletLedgerEntry;
use App\Models\WalletTransaction;
use App\Models\WalletWithdrawal;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Illuminate\Validation\ValidationException;

class WalletService
{
    public function wallets(User $user, ?int $tenantId)
    {
        $wallets = collect([$this->walletFor($user, 'user')]);
        if ($tenantId && ($user->isMasterAdmin() || $user->isTenantOwner())) {
            $wallets->push($this->walletFor(Tenant::findOrFail($tenantId), 'tenant'));
        }

        return $wallets->values();
    }

    public function ledger(Wallet $wallet, User $actor, ?int $tenantId, array $filters)
    {
        $this->authorizeWallet($wallet, $actor, $tenantId);

        return $wallet->ledgerEntries()->with('transaction:id,uuid,transaction_number,type,status,description,created_at')
            ->latest('id')->paginate($filters['per_page'] ?? 10);
    }

    public function transfer(Wallet $source, Wallet $destination, float $amount, User $actor, ?int $tenantId): WalletTransaction
    {
        $this->authorizeWallet($source, $actor, $tenantId);
        $this->authorizeWallet($destination, $actor, $tenantId);
        if ($source->is($destination)) {
            throw ValidationException::withMessages(['destination_wallet_id' => 'Dompet tujuan harus berbeda.']);
        }
        if ($amount <= 0) {
            throw ValidationException::withMessages(['amount' => 'Nominal harus lebih dari nol.']);
        }

        return DB::transaction(function () use ($source, $destination, $amount, $actor) {
            $wallets = Wallet::whereIn('id', [$source->id, $destination->id])->lockForUpdate()->get()->keyBy('id');
            $from = $wallets[$source->id];
            $to = $wallets[$destination->id];
            if ((float) $from->available_balance < $amount) {
                throw ValidationException::withMessages(['amount' => 'Saldo tidak mencukupi.']);
            }
            $transaction = $this->newTransaction('transfer', $amount, $actor, 'Pindah saldo antar dompet');
            $this->post($from, $transaction, 'debit', $amount);
            $this->post($to, $transaction, 'credit', $amount);
            $transaction->update(['status' => 'completed', 'completed_at' => now()]);

            return $transaction->load('entries.wallet');
        });
    }

    public function requestWithdrawal(Wallet $wallet, array $data, User $actor, ?int $tenantId): WalletWithdrawal
    {
        $this->authorizeWallet($wallet, $actor, $tenantId);

        return DB::transaction(function () use ($wallet, $data, $actor) {
            $locked = Wallet::lockForUpdate()->findOrFail($wallet->id);
            $total = (float) $data['amount'] + (float) ($data['fee'] ?? 0);
            if ((float) $locked->available_balance < $total) {
                throw ValidationException::withMessages(['amount' => 'Saldo tidak mencukupi.']);
            }
            $transaction = $this->newTransaction('withdrawal', $data['amount'], $actor, 'Permintaan penarikan saldo', $data['fee'] ?? 0);
            $this->post($locked, $transaction, 'debit', $total);

            return WalletWithdrawal::create([
                'uuid' => Str::uuid(), 'wallet_id' => $locked->id, 'wallet_transaction_id' => $transaction->id,
                'requested_by' => $actor->id, 'amount' => $data['amount'], 'fee' => $data['fee'] ?? 0,
                'bank_code' => $data['bank_code'], 'account_number' => $data['account_number'],
                'account_name' => $data['account_name'], 'status' => 'pending_approval',
            ]);
        });
    }

    private function walletFor(Model $owner, string $type): Wallet
    {
        return Wallet::firstOrCreate(
            ['owner_type' => $owner->getMorphClass(), 'owner_id' => $owner->getKey(), 'wallet_type' => $type, 'currency' => 'IDR'],
            ['uuid' => Str::uuid(), 'status' => 'active']
        );
    }

    private function newTransaction(string $type, float $amount, User $actor, string $description, float $fee = 0): WalletTransaction
    {
        return WalletTransaction::create([
            'uuid' => Str::uuid(), 'transaction_number' => 'WLT-'.now()->format('YmdHis').'-'.Str::upper(Str::random(6)),
            'type' => $type, 'status' => 'processing', 'initiated_by' => $actor->id, 'amount' => $amount,
            'fee' => $fee, 'idempotency_key' => (string) Str::uuid(), 'description' => $description,
        ]);
    }

    private function post(Wallet $wallet, WalletTransaction $transaction, string $type, float $amount): void
    {
        $before = (float) $wallet->available_balance;
        $after = $type === 'credit' ? $before + $amount : $before - $amount;
        WalletLedgerEntry::create([
            'wallet_id' => $wallet->id, 'wallet_transaction_id' => $transaction->id, 'entry_type' => $type,
            'balance_bucket' => 'available', 'amount' => $amount, 'balance_before' => $before,
            'balance_after' => $after, 'description' => $transaction->description,
        ]);
        $wallet->update(['available_balance' => $after, 'version' => $wallet->version + 1]);
    }

    private function authorizeWallet(Wallet $wallet, User $actor, ?int $tenantId): void
    {
        if ($actor->isMasterAdmin()) {
            return;
        }
        $allowed = ($wallet->owner_type === $actor->getMorphClass() && (int) $wallet->owner_id === (int) $actor->id)
            || ($actor->isTenantOwner() && $wallet->owner_type === (new Tenant)->getMorphClass() && (int) $wallet->owner_id === (int) $tenantId);
        abort_unless($allowed, 403, 'Dompet tidak dapat diakses.');
    }
}