<?php

namespace Modules\EcommerceFinance\Services;

use Illuminate\Support\Carbon;
use Illuminate\Support\Str;
use Modules\EcommerceFinance\Repositories\JushuitanCostPriceHistoryMirrorRepository;
use RuntimeException;
use Throwable;

class JushuitanCostPriceHistorySynchronizer
{
    public function __construct(
        private readonly JushuitanOpenApiClient $upstream,
        private readonly JushuitanCostPriceHistoryMirrorRepository $mirror,
    ) {
    }

    /** @return array{status:string,mode:string,pages:int,source_rows:int,rows:int} */
    public function sync(bool $full = false, ?int $pageSize = null, ?int $maxPages = null): array
    {
        if (! $this->mirror->available()) {
            throw new RuntimeException('jushuitan_cost_price_history_mirror_schema_missing');
        }

        $state = $this->mirror->state();
        if (! $full && ($state['initial_completed_at'] ?? null) === null) {
            return ['status' => 'requires_full_sync', 'mode' => 'incremental', 'pages' => 0, 'source_rows' => 0, 'rows' => 0];
        }

        $mode = $full ? 'full' : 'incremental';
        $resume = is_array($state)
            && ($state['run_mode'] ?? null) === $mode
            && in_array($state['status'] ?? null, ['running', 'failed'], true)
            && ($state['window_started_at'] ?? null) !== null
            && ($state['window_ends_at'] ?? null) !== null;
        $generation = $resume && is_string($state['generation'] ?? null)
            ? (string) $state['generation']
            : (string) Str::uuid();
        if ($resume) {
            $since = Carbon::parse((string) $state['window_started_at']);
            $until = Carbon::parse((string) $state['window_ends_at']);
        } elseif ($full) {
            $since = $this->historyStart();
            $until = now();
        } else {
            $overlap = max((int) config('services.jushuitan.cost_price_history_overlap_hours', 48), 1);
            $since = Carbon::parse((string) $state['last_succeeded_at'])->subHours($overlap);
            $until = now();
        }

        $state = $this->mirror->startRun($mode, $generation, $since, $until, $resume);
        $windowStartedAt = ($state['cursor_window_started_at'] ?? null) === null
            ? $since->copy()
            : Carbon::parse((string) $state['cursor_window_started_at']);
        $page = max((int) ($state['cursor_page'] ?? 1), 1);
        $pageSize = min(max(
            $pageSize ?? (int) config('services.jushuitan.cost_price_history_page_size', 50),
            1,
        ), 50);
        $maxPages = max(
            $maxPages ?? (int) config('services.jushuitan.cost_price_history_max_pages', 30),
            0,
        );
        $pages = 0;
        $processedSourceRows = (int) ($state['last_processed_source_rows'] ?? 0);
        $upsertedRows = (int) ($state['last_upserted_rows'] ?? 0);
        $windowDays = min(max(
            (int) config('services.jushuitan.cost_price_history_window_days', 7),
            1,
        ), 7);

        try {
            while ($windowStartedAt->lt($until)) {
                $windowEndsAt = $windowStartedAt->copy()->addDays($windowDays);
                if ($windowEndsAt->gte($until)) {
                    $windowEndsAt = $until->copy();
                }

                $result = $this->upstream->getCostPriceOperationHistory(
                    $windowStartedAt,
                    $windowEndsAt,
                    $page,
                    $pageSize,
                );
                $records = $result['records'];
                $processedSourceRows += $result['source_rows'];
                $upsertedRows += count($records);
                $pages++;

                $hasNextPage = $result['has_next'];
                // 相邻窗口在边界秒保留一次重叠，避免接口时间精度高于秒时漏掉记录；
                // operation_id 的幂等 upsert 会消除边界重复。
                $nextWindowStartedAt = $hasNextPage
                    ? $windowStartedAt->copy()
                    : $windowEndsAt->copy();
                $nextPage = $hasNextPage ? $page + 1 : 1;
                $this->mirror->storePage(
                    $records,
                    $nextWindowStartedAt,
                    $nextPage,
                    $generation,
                    $processedSourceRows,
                    $upsertedRows,
                );
                $windowStartedAt = $nextWindowStartedAt;
                $page = $nextPage;

                if ($maxPages > 0 && $pages >= $maxPages && $windowStartedAt->lt($until)) {
                    return [
                        'status' => 'running',
                        'mode' => $mode,
                        'pages' => $pages,
                        'source_rows' => $processedSourceRows,
                        'rows' => $upsertedRows,
                    ];
                }
            }

            $this->mirror->complete(
                $mode,
                $generation,
                $until,
                $processedSourceRows,
                $upsertedRows,
            );

            return [
                'status' => 'succeeded',
                'mode' => $mode,
                'pages' => $pages,
                'source_rows' => $processedSourceRows,
                'rows' => $upsertedRows,
            ];
        } catch (Throwable $exception) {
            $message = trim($exception->getMessage());
            $errorCode = preg_match('/^[a-z0-9_]+$/', $message) === 1
                ? $message
                : $exception::class;
            $this->mirror->fail($errorCode);
            throw $exception;
        }
    }

    private function historyStart(): Carbon
    {
        $configured = trim((string) config(
            'services.jushuitan.cost_price_history_start',
            '2000-01-01 00:00:00',
        ));

        return Carbon::parse($configured === '' ? '2000-01-01 00:00:00' : $configured);
    }
}