<?php

namespace Modules\EcommerceFinance\Services;

use Carbon\CarbonImmutable;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Modules\EcommerceFinance\Http\Controllers\AccountBills;
use Modules\EcommerceFinance\Http\Controllers\AlipayBills;
use Modules\EcommerceFinance\Http\Controllers\PinduoduoAccountBills;
use Modules\EcommerceFinance\Http\Controllers\TaobaoWechatAccountBills;
use Modules\EcommerceFinance\Repositories\PinduoduoSettlementBillRepository;
use Modules\EcommerceFinance\Repositories\StoreReceivingAlipayBillMirrorRepository;
use Modules\EcommerceFinance\Repositories\TaobaoWechatOpeningBalanceRepository;
use Modules\EcommerceFinance\Repositories\TaobaoWechatSettlementBillRepository;
use RuntimeException;
use Throwable;

class StoreReceivingBalanceOverviewService
{
    /** @var array<int,array{slug:string,name:string}> */
    public const PLATFORMS = [
        ['slug' => 'taobao-alipay', 'name' => '淘系支付宝账户'],
        ['slug' => 'taobao-wechat', 'name' => '淘系微信账户'],
        ['slug' => 'pinduoduo', 'name' => '拼多多账户'],
        ['slug' => 'jd-wallet', 'name' => '京东网银钱包账户'],
        ['slug' => 'douyin', 'name' => '抖音账户'],
        ['slug' => 'vipshop', 'name' => '唯品会MP账户'],
        ['slug' => 'vipshop-jx', 'name' => '唯品会JX账户'],
        ['slug' => 'xiaohongshu', 'name' => '小红书账户'],
    ];

    public function __construct(
        private readonly AlipayBills $alipayBills,
        private readonly TaobaoWechatAccountBills $taobaoWechatBills,
        private readonly PinduoduoAccountBills $pinduoduoBills,
        private readonly AccountBills $accountBills,
    ) {}

    /** @return array<string,mixed> */
    public function overview(string $month): array
    {
        $start = CarbonImmutable::createFromFormat('!Y-m', $month, 'Asia/Shanghai');
        if (! $start instanceof CarbonImmutable || $start->format('Y-m') !== $month) {
            throw new RuntimeException('invalid_balance_overview_month');
        }

        $periodStart = $start->startOfMonth()->format('Y-m-d');
        $periodEnd = $start->endOfMonth()->format('Y-m-d');
        $platforms = [];
        $availableTotals = [
            'opening_balance' => 0.0,
            'income' => 0.0,
            'expense' => 0.0,
        ];
        $availableCount = 0;

        foreach (self::PLATFORMS as $definition) {
            try {
                $summary = $this->fetchPlatformSummary(
                    $definition['slug'],
                    $periodStart,
                    $periodEnd,
                );
                if ($summary['opening_balance'] === null) {
                    throw new RuntimeException('平台期初余额未就绪');
                }

                $availableCount++;
                $availableTotals['opening_balance'] += (float) $summary['opening_balance'];
                $availableTotals['income'] += (float) $summary['income'];
                $availableTotals['expense'] += (float) $summary['expense'];
                $platforms[] = [
                    'slug' => $definition['slug'],
                    'name' => $definition['name'],
                    'available' => true,
                    'opening_balance' => round((float) $summary['opening_balance'], 2),
                    'income' => round((float) $summary['income'], 2),
                    'expense' => round((float) $summary['expense'], 2),
                    'balance' => round(
                        (float) $summary['opening_balance']
                        + (float) $summary['income']
                        - (float) $summary['expense'],
                        2,
                    ),
                    'error' => null,
                ];
            } catch (Throwable $exception) {
                report($exception);
                $platforms[] = [
                    'slug' => $definition['slug'],
                    'name' => $definition['name'],
                    'available' => false,
                    'opening_balance' => null,
                    'income' => null,
                    'expense' => null,
                    'balance' => null,
                    'error' => $this->safeErrorMessage($exception),
                ];
            }
        }

        $complete = $availableCount === count(self::PLATFORMS);
        $openingBalance = $complete ? round($availableTotals['opening_balance'], 2) : null;
        $income = $complete ? round($availableTotals['income'], 2) : null;
        $expense = $complete ? round($availableTotals['expense'], 2) : null;

        return [
            'month' => $month,
            'period' => [
                'start' => $periodStart,
                'end' => $periodEnd,
            ],
            'summary' => [
                'opening_balance' => $openingBalance,
                'income' => $income,
                'expense' => $expense,
                'balance' => $complete
                    ? round($openingBalance + $income - $expense, 2)
                    : null,
                'platform_count' => count(self::PLATFORMS),
                'available_platform_count' => $availableCount,
                'complete' => $complete,
            ],
            'platforms' => $platforms,
        ];
    }

    /**
     * @return array{opening_balance:float|null,income:float,expense:float}
     */
    protected function fetchPlatformSummary(string $platform, string $start, string $end): array
    {
        $request = Request::create('/ecommerce-finance/account-bills/overview', 'GET', [
            'start' => $start,
            'end' => $end,
            'page' => 1,
            'limit' => 1,
            'sort' => 'occurred_at',
            'dir' => 'desc',
        ], [], [], ['HTTP_ACCEPT' => 'application/json']);

        $response = match ($platform) {
            'taobao-alipay' => $this->alipayBills->index(
                $request,
                app(StoreReceivingAlipayBillMirrorRepository::class),
            ),
            'taobao-wechat' => $this->taobaoWechatBills->index(
                $request,
                app(TaobaoWechatSettlementBillRepository::class),
                app(TaobaoWechatOpeningBalanceRepository::class),
            ),
            'pinduoduo' => $this->pinduoduoBills->index(
                $request,
                app(PinduoduoSettlementBillRepository::class),
            ),
            'jd-wallet', 'douyin', 'vipshop', 'vipshop-jx', 'xiaohongshu' => $this->accountBills->index(
                $request,
                $platform,
            ),
            default => throw new RuntimeException('unsupported_balance_overview_platform'),
        };

        return $this->summaryFromResponse($response);
    }

    /** @return array{opening_balance:float|null,income:float,expense:float} */
    private function summaryFromResponse(JsonResponse $response): array
    {
        $payload = json_decode($response->getContent(), true, 512, JSON_THROW_ON_ERROR);
        if ($response->getStatusCode() !== 200 || ! is_array($payload)) {
            throw new RuntimeException((string) ($payload['message'] ?? '平台账单暂时无法读取'));
        }

        $summary = $payload['summary'] ?? null;
        if (! is_array($summary)
            || ! array_key_exists('opening_balance', $summary)
            || ! is_numeric($summary['income'] ?? null)
            || ! is_numeric($summary['expense'] ?? null)
        ) {
            throw new RuntimeException('平台账单汇总数据不完整');
        }

        return [
            'opening_balance' => is_numeric($summary['opening_balance'])
                ? round((float) $summary['opening_balance'], 2)
                : null,
            'income' => round((float) $summary['income'], 2),
            'expense' => round((float) $summary['expense'], 2),
        ];
    }

    private function safeErrorMessage(Throwable $exception): string
    {
        $message = trim($exception->getMessage());

        return match ($message) {
            '平台期初余额未就绪' => $message,
            '平台账单汇总数据不完整' => $message,
            'invalid_balance_overview_month' => '月份格式无效',
            'unsupported_balance_overview_platform' => '平台类型无效',
            '' => '平台账单暂时无法读取',
            default => mb_substr($message, 0, 160),
        };
    }
}