<?php

namespace App\Business;

use App\Models\Business\InputInvoiceReport;
use App\Models\Business\OutputInvoiceReport;
use Illuminate\Support\Collection;
use Throwable;

/**
 * 发票数据报表：发票情况汇总在前，进项/销项明细在后。
 *
 * 汇总按公司名称合并进项报表与销项报表，金额均使用两张报表的合计口径；
 * 差额 = 销项 − 进项，正数表示销项大于进项。
 */
class InvoiceReportsPageData
{
    private const TABS = ['summary', 'input', 'output'];

    public function page(?string $tab): array
    {
        $tab = in_array($tab, self::TABS, true) ? $tab : 'summary';

        $inputRows = $this->reportRows(InputInvoiceReport::class);
        $outputRows = $this->reportRows(OutputInvoiceReport::class);

        if ($tab === 'summary') {
            $allRows = $this->summaryRows($inputRows, $outputRows);
            $filters = $this->summaryFilters();
            $summaryRows = $this->filterSummaryRows($allRows, $filters);

            return [
                'view' => 'business.pages.invoice_reports',
                'summaryRows' => $summaryRows,
                'summaryTotals' => $this->summaryTotals($summaryRows),
                'summaryFilters' => $filters,
                'companyOptions' => $allRows->pluck('company_name')
                    ->filter(static fn ($name): bool => (string) $name !== '')
                    ->unique()
                    ->sort()
                    ->values(),
                'taxpayerTypeOptions' => $allRows->pluck('taxpayer_type')
                    ->filter(static fn ($type): bool => (string) $type !== '' && (string) $type !== '—')
                    ->unique()
                    ->sort()
                    ->values(),
            ];
        }

        return [
            'view' => 'business.pages.invoice_reports',
            'items' => $tab === 'output' ? $outputRows : $inputRows,
        ];
    }

    /**
     * 报表表在部分老环境可能尚未迁移，缺失时保持页面可用并展示空表。
     *
     * @param  class-string  $model
     */
    private function reportRows(string $model): Collection
    {
        try {
            return $model::query()
                ->orderBy('company_name')
                ->orderBy('id')
                ->get();
        } catch (Throwable $exception) {
            report($exception);

            return collect();
        }
    }

    private function summaryRows(Collection $inputRows, Collection $outputRows): Collection
    {
        $inputs = $inputRows->groupBy(fn ($row): string => trim((string) $row->company_name));
        $outputs = $outputRows->groupBy(fn ($row): string => trim((string) $row->company_name));

        $companyNames = $inputs->keys()
            ->merge($outputs->keys())
            ->filter(static fn ($name): bool => $name !== '')
            ->unique()
            ->sort()
            ->values();

        $taxpayerTypes = $this->taxpayerTypes($companyNames);

        return $companyNames->map(function (string $companyName) use ($inputs, $outputs, $taxpayerTypes): object {
            $inputRows = $inputs->get($companyName, collect());
            $outputRows = $outputs->get($companyName, collect());

            $inputAmount = $this->sumField($inputRows, 'input_total_amount');
            $inputTax = $this->sumField($inputRows, 'input_total_tax');
            $outputAmount = $this->sumField($outputRows, 'output_total_amount');
            $outputTax = $this->sumField($outputRows, 'output_total_tax');
            $ratio = $outputAmount > 0 ? $inputAmount / $outputAmount : null;

            return (object) [
                'company_name' => $companyName,
                'taxpayer_type' => $taxpayerTypes->get($companyName, '—'),
                'input_total_amount' => $inputAmount,
                'input_total_tax' => $inputTax,
                'output_total_amount' => $outputAmount,
                'output_total_tax' => $outputTax,
                'input_output_ratio' => $ratio,
                'is_warning' => $ratio !== null && $ratio < 0.8,
            ];
        });
    }

    private function summaryTotals(Collection $rows): object
    {
        return (object) [
            'input_total_amount' => round((float) $rows->sum('input_total_amount'), 2),
            'input_total_tax' => round((float) $rows->sum('input_total_tax'), 2),
            'output_total_amount' => round((float) $rows->sum('output_total_amount'), 2),
            'output_total_tax' => round((float) $rows->sum('output_total_tax'), 2),
        ];
    }

    /**
     * @return array{company:string,taxpayer_type:string,warning:string}
     */
    private function summaryFilters(): array
    {
        $warning = strtolower(trim((string) request()->query('warning', '')));

        return [
            'company' => trim((string) request()->query('company', '')),
            'taxpayer_type' => trim((string) request()->query('taxpayer_type', '')),
            'warning' => in_array($warning, ['yes', 'no'], true) ? $warning : '',
        ];
    }

    /**
     * @param  array{company:string,taxpayer_type:string,warning:string}  $filters
     */
    private function filterSummaryRows(Collection $rows, array $filters): Collection
    {
        return $rows->filter(function (object $row) use ($filters): bool {
            if ($filters['company'] !== '' && $row->company_name !== $filters['company']) {
                return false;
            }

            if ($filters['taxpayer_type'] !== '' && $row->taxpayer_type !== $filters['taxpayer_type']) {
                return false;
            }

            if ($filters['warning'] === 'yes' && ! $row->is_warning) {
                return false;
            }

            if ($filters['warning'] === 'no' && $row->is_warning) {
                return false;
            }

            return true;
        })->values();
    }

    /**
     * 纳税人类型取公司基础信息共享镜像；镜像未就绪或公司未登记时显示「—」。
     */
    private function taxpayerTypes(Collection $companyNames): Collection
    {
        $names = $companyNames
            ->map(static fn ($name): string => trim((string) $name))
            ->filter(static fn (string $name): bool => $name !== '')
            ->unique()
            ->values()
            ->all();

        if ($names === []) {
            return collect();
        }

        try {
            $rows = app(\Modules\EcommerceFinance\Repositories\BusinessInformationMirrorRepository::class)
                ->allCompaniesForClassification(['_company_names' => $names]);

            return collect($rows)
                ->mapWithKeys(static fn (array $row): array => [
                    trim((string) ($row['company_name'] ?? '')) => trim((string) ($row['taxpayer_category'] ?? '')),
                ])
                ->filter(static fn ($value, $key): bool => $key !== '' && (string) $value !== '');
        } catch (Throwable $exception) {
            report($exception);

            return collect();
        }
    }

    private function sumField(Collection $rows, string $field): float
    {
        return round($rows->sum(static fn ($row): float => (float) $row->{$field}), 2);
    }
}