<?php

namespace Modules\EcommerceFinance\Repositories;

use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Modules\EcommerceFinance\Services\GoodsProfitAfsLookupSchema;

/**
 * 订单售后费用明细：聚水潭「商品利润 → 导出明细数据 → 订单售后费用数据」原表。
 *
 * 原表 rpt.jst_goods_profit_kpi_items_afs 的列名是 undefined1..undefinedN，
 * 中文表头放在 rpt.jst_goods_profit_kpi_items_afs_schemas（column → name）。
 * 两张表都镜像到共享业务库后，页面按 schemas 映射读取字段。
 */
class GoodsProfitAfsRepository
{
    public const MAIN_DATASET = 'operations_replica.rpt.jst_goods_profit_kpi_items_afs';

    public const SCHEMA_DATASET = 'operations_replica.rpt.jst_goods_profit_kpi_items_afs_schemas';

    private const MAIN_TABLE = 'ops_jst_goods_profit_kpi_items_afs';

    private const SCHEMA_TABLE = 'ops_jst_goods_profit_kpi_items_afs_schemas';

    /** @var array<string,string>|null */
    private ?array $fieldColumns = null;

    private ?bool $hasDateLookup = null;

    public function ready(): bool
    {
        try {
            return Schema::connection($this->connectionName())->hasTable(self::MAIN_TABLE)
                && Schema::connection($this->connectionName())->hasTable(self::SCHEMA_TABLE)
                && $this->initialSyncCompleted()
                && $this->connection()->table(self::MAIN_TABLE)->exists();
        } catch (\Throwable) {
            return false;
        }
    }

    /** 首次全量同步完成前不对外使用，避免页面读到不完整的数据。 */
    private function initialSyncCompleted(): bool
    {
        $state = $this->connection()->table('business_mirror_table_states')
            ->where('dataset_key', self::MAIN_DATASET)
            ->first(['initial_completed_at']);

        return $state !== null && $state->initial_completed_at !== null;
    }

    /**
     * 页面字段键 => 上游列名（undefinedN）。
     *
     * @return array<string,string>
     */
    public function fieldColumns(): array
    {
        if ($this->fieldColumns !== null) {
            return $this->fieldColumns;
        }

        $headers = (array) config('order_after_sales_cost.headers', []);
        $map = [];
        $existing = array_map(
            'strtolower',
            Schema::connection($this->connectionName())->getColumnListing(self::MAIN_TABLE),
        );

        foreach ($this->connection()->table(self::SCHEMA_TABLE)->orderBy('id')->get(['column', 'name']) as $schema) {
            $label = self::normalizeLabel((string) $schema->name);
            $field = $headers[$label] ?? null;
            $column = (string) $schema->column;

            // 同一科目出现多次（如 800105佣金 / 800105平台佣金）时保留第一次映射。
            // schemas 里有 170 条，但原表只有 160 列，提前过滤掉不存在的列。
            if ($field !== null && ! isset($map[$field]) && in_array(strtolower($column), $existing, true)) {
                $map[$field] = $column;
            }
        }

        return $this->fieldColumns = $map;
    }

    /** @param array<string,mixed> $filters */
    public function covers(array $filters): bool
    {
        if (! $this->ready()) {
            return false;
        }

        $columns = $this->fieldColumns();
        $orderNo = trim((string) ($filters['order_no'] ?? ''));

        // 单号查询走各自列的索引，避免 undefined2 OR undefined1 触发全表扫描。
        if ($orderNo !== '') {
            foreach ($this->orderNumberFields($orderNo) as $field) {
                if (! isset($columns[$field])) {
                    continue;
                }

                $query = $this->connection()->table(self::MAIN_TABLE)
                    ->where($columns[$field], 'like', $orderNo . '%');
                $this->applyDateRange($query, $filters, $columns);

                if ($query->limit(1)->exists()) {
                    return true;
                }
            }

            return false;
        }

        return $this->filtered($filters, $columns)->limit(1)->exists();
    }

    /**
     * @param array<string,mixed> $filters
     * @return array{rows:list<array<string,mixed>>,has_more:bool}
     */
    public function paginate(array $filters, int $page, int $limit): array
    {
        $page = max($page, 1);
        $limit = min(max($limit, 1), 100);
        $columns = $this->fieldColumns();
        $select = array_values(array_unique(array_merge(['id'], array_values($columns))));
        $orderColumn = $columns['order_time'] ?? null;
        $orderNo = trim((string) ($filters['order_no'] ?? ''));

        if ($orderNo !== '') {
            return $this->paginateByOrderNumber($orderNo, $filters, $columns, $select, $page, $limit);
        }

        $query = $this->filtered($filters, $columns)->select($select);

        if ($orderColumn !== null) {
            $query->orderByRaw($this->dateExpression($orderColumn) . ' desc');
        }

        $records = $query->orderByDesc('id')->offset(($page - 1) * $limit)->limit($limit + 1)->get();
        $numberKeys = array_flip((array) config('order_after_sales_cost.number_keys', []));
        $rows = [];

        foreach ($records as $record) {
            $row = [];

            foreach ($columns as $field => $column) {
                $value = $record->{$column} ?? null;

                if (isset($numberKeys[$field])) {
                    $value = $value === null ? null : (float) $value;
                }

                $row[$field] = is_string($value) ? trim($value) : $value;
            }

            $rows[] = $row;
        }

        return [
            'rows' => array_slice($rows, 0, $limit),
            'has_more' => count($rows) > $limit,
        ];
    }

    /**
     * 单号查询：分别走 online/internal 两个索引，合并后在 PHP 排序分页。
     *
     * @param array<string,mixed> $filters
     * @param array<string,string> $columns
     * @param list<string> $select
     * @return array{rows:list<array<string,mixed>>,has_more:bool}
     */
    private function paginateByOrderNumber(
        string $orderNo,
        array $filters,
        array $columns,
        array $select,
        int $page,
        int $limit,
    ): array {
        $records = [];
        $cap = max($limit * 4, 400);

        foreach ($this->orderNumberFields($orderNo) as $field) {
            if (! isset($columns[$field])) {
                continue;
            }

            $query = $this->connection()->table(self::MAIN_TABLE)
                ->select($select)
                ->where($columns[$field], 'like', $orderNo . '%');
            $this->applyDateRange($query, $filters, $columns);

            foreach ($query->limit($cap)->get() as $record) {
                $records[(int) $record->id] = $record;
            }
        }

        $timeColumn = $columns['order_time'] ?? null;
        usort($records, static function ($left, $right) use ($timeColumn): int {
            $leftTime = $timeColumn !== null ? strtotime(str_replace('/', '-', (string) ($left->{$timeColumn} ?? ''))) : false;
            $rightTime = $timeColumn !== null ? strtotime(str_replace('/', '-', (string) ($right->{$timeColumn} ?? ''))) : false;

            return [$rightTime ?: 0, (int) $right->id] <=> [$leftTime ?: 0, (int) $left->id];
        });

        $numberKeys = array_flip((array) config('order_after_sales_cost.number_keys', []));
        $rows = [];

        foreach ($records as $record) {
            $row = [];

            foreach ($columns as $field => $column) {
                $value = $record->{$column} ?? null;

                if (isset($numberKeys[$field])) {
                    $value = $value === null ? null : (float) $value;
                }

                $row[$field] = is_string($value) ? trim($value) : $value;
            }

            $rows[] = $row;
        }

        $offset = ($page - 1) * $limit;

        return [
            'rows' => array_slice($rows, $offset, $limit),
            'has_more' => count($rows) > $offset + $limit,
        ];
    }

    /**
     * @param array<string,mixed> $filters
     * @param array<string,string> $columns
     */
    private function filtered(array $filters, array $columns): \Illuminate\Database\Query\Builder
    {
        $query = $this->connection()->table(self::MAIN_TABLE);
        $from = trim((string) ($filters['from'] ?? ''));
        $to = trim((string) ($filters['to'] ?? ''));
        $orderNo = trim((string) ($filters['order_no'] ?? ''));
        $sku = trim((string) ($filters['sku_id'] ?? ''));
        $shops = array_values(array_filter((array) ($filters['shop_names'] ?? []), static fn ($v) => trim((string) $v) !== ''));

        // 原表的订单时间是字符串（如 2026/8/23 14:58:51，不补零），不能直接和 ISO 日期做字符串比较。
        if (($from !== '' || $to !== '') && isset($columns['order_time'])) {
            $expression = $this->dateExpression($columns['order_time']);

            if ($from !== '') {
                $query->whereRaw($expression . ' >= ?', [$from . ' 00:00:00']);
            }

            if ($to !== '') {
                $query->whereRaw($expression . ' <= ?', [$to . ' 23:59:59']);
            }
        }

        if ($shops !== [] && isset($columns['shop_name'])) {
            $query->whereIn($columns['shop_name'], $shops);
        }

        if ($orderNo !== '') {
            $query->where(function ($inner) use ($columns, $orderNo): void {
                $matched = false;

                foreach (['online_order_no', 'internal_order_no'] as $field) {
                    if (! isset($columns[$field])) {
                        continue;
                    }

                    $inner->orWhere($columns[$field], 'like', $orderNo . '%');
                    $matched = true;
                }

                if (! $matched) {
                    $inner->whereRaw('1 = 0');
                }
            });
        }

        if ($sku !== '' && isset($columns['product_code'])) {
            $query->where($columns['product_code'], 'like', '%' . addcslashes($sku, '%_\\') . '%');
        }

        return $query;
    }

    /**
     * @param array<string,mixed> $filters
     * @param array<string,string> $columns
     */
    private function applyDateRange(\Illuminate\Database\Query\Builder $query, array $filters, array $columns): void
    {
        $from = trim((string) ($filters['from'] ?? ''));
        $to = trim((string) ($filters['to'] ?? ''));

        if (($from === '' && $to === '') || ! isset($columns['order_time'])) {
            return;
        }

        $expression = $this->dateExpression($columns['order_time']);

        if ($from !== '') {
            $query->whereRaw($expression . ' >= ?', [$from . ' 00:00:00']);
        }

        if ($to !== '') {
            $query->whereRaw($expression . ' <= ?', [$to . ' 23:59:59']);
        }
    }

    private function dateExpression(string $column): string
    {
        // Dynamic schemas can move the source field. Keep the original parser
        // until the matching additive lookup has been installed.
        if ($column === 'undefined7') {
            $this->hasDateLookup ??= Schema::connection($this->connectionName())
                ->hasColumn(self::MAIN_TABLE, GoodsProfitAfsLookupSchema::DATE_COLUMN);
            if ($this->hasDateLookup) {
                return '`' . GoodsProfitAfsLookupSchema::DATE_COLUMN . '`';
            }
        }

        return "STR_TO_DATE(REPLACE(`{$column}`, '/', '-'), '%Y-%m-%d %H:%i:%s')";
    }

    private function connection(): \Illuminate\Database\ConnectionInterface
    {
        return DB::connection($this->connectionName());
    }

    private function connectionName(): string
    {
        return (string) config('upstream_mirrors.connection', 'business_mirror');
    }

    private static function normalizeLabel(string $label): string
    {
        $label = str_replace(["\u{3000}", "\u{00A0}"], ' ', $label);
        $label = preg_replace('/\s+/u', ' ', $label) ?? $label;

        return trim($label);
    }

    /**
     * 线上订单号和内部订单号长度差很多（19 位 vs 7~8 位）。长单号只查线上订单号，
     * 避免用内部订单号列做 `like '长单号%'` 的全表扫描。
     *
     * @return list<string>
     */
    private function orderNumberFields(string $orderNo): array
    {
        return mb_strlen($orderNo) >= 12
            ? ['online_order_no']
            : ['online_order_no', 'internal_order_no'];
    }
}