<?php

namespace Modules\EcommerceFinance\Services;

use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;
use Modules\EcommerceFinance\Services\SupplierBookkeepingDeductionRule as Rule;

/** 供应商应付「厂家记账」配置：每个供应商一条记账方式，删除可恢复，操作留痕。 */
class SupplierBookkeepingConfigStore
{
    public const TABLE = 'business_supplier_bookkeeping_configs';
    public const EVENTS = 'business_supplier_bookkeeping_config_events';

    private const FIELDS = ['mode', 'effective_from', 'effective_to', 'source_text'];

    public function query()
    {
        return DB::table(self::TABLE);
    }

    /** @return array<string,array<string,mixed>> 供应商名称 => 生效中的配置（未删除） */
    public function activeConfigs(): array
    {
        $result = [];
        foreach ($this->query()->whereNull('deleted_at')->get() as $row) {
            $result[trim($row->supplier_name)] = (array) $row;
        }

        return $result;
    }

    public function filtered(array $filters)
    {
        $query = $this->query();
        $status = $filters['deleted_status'] ?? 'active';
        if ($status === 'deleted') {
            $query->whereNotNull('deleted_at');
        } elseif ($status !== 'all') {
            $query->whereNull('deleted_at');
        }
        if (($filters['supplier_name'] ?? '') !== '') {
            $query->where('supplier_name', 'like', '%' . addcslashes($filters['supplier_name'], '\\%_') . '%');
        }
        if (($filters['mode'] ?? '') !== '') {
            $query->where('mode', $filters['mode']);
        }

        return $query->orderBy('supplier_name')->orderBy('id');
    }

    /** @param array{supplier_name:string,mode:string,effective_from:?string,effective_to:?string,source_text?:string} $data */
    public function save(array $data, string $actor, ?int $id = null): int
    {
        return DB::transaction(function () use ($data, $actor, $id): int {
            $before = $id === null ? null : $this->query()->where('id', $id)->whereNull('deleted_at')->lockForUpdate()->first();
            abort_if($id !== null && $before === null, 404);
            $name = trim($data['supplier_name']);
            $duplicate = $this->query()->where('supplier_name', $name)->when($id !== null, fn ($q) => $q->where('id', '<>', $id))->exists();
            if ($duplicate) {
                throw ValidationException::withMessages(['supplier_name' => '该供应商已有配置（含已删除），请编辑或恢复原配置。']);
            }
            $time = $this->time();
            $values = ['supplier_name' => $name, 'updated_at' => $time] + $this->values($data);
            if ($id === null) {
                $id = $this->query()->insertGetId($values + ['creator' => $actor, 'created_at' => $time]);
            } else {
                $this->query()->where('id', $id)->update($values);
            }
            $this->event($id, $actor, $before ? 'update' : 'create', ($before ? '修改' : '新增') . '厂家记账配置：' . $name . ' → ' . Rule::describe($values), ['before' => $before, 'after' => $values]);

            return $id;
        });
    }

    public function changeDeleted(int $id, bool $deleted, string $actor): void
    {
        DB::transaction(function () use ($id, $deleted, $actor): void {
            $row = $this->query()->where('id', $id)->lockForUpdate()->first();
            abort_if($row === null, 404);
            if (($row->deleted_at !== null) === $deleted) {
                return;
            }
            $this->query()->where('id', $id)->update(['deleted_at' => $deleted ? $this->time() : null, 'updated_at' => $this->time()]);
            $this->event($id, $actor, $deleted ? 'delete' : 'restore', ($deleted ? '删除' : '恢复') . '厂家记账配置：' . $row->supplier_name, ['supplier_name' => $row->supplier_name, 'mode' => $row->mode]);
        });
    }

    /**
     * 整批导入：新供应商新增；已有供应商记账方式或生效期不同则按文件更新（已删除的一并恢复）；相同则跳过。
     *
     * @param list<array{supplier_name:string,mode:string,effective_from:?string,effective_to:?string,source_text:string}> $rows
     * @return array{added:int,updated:int,skipped:int}
     */
    public function import(array $rows, string $actor, string $sourceHash): array
    {
        return DB::transaction(function () use ($rows, $actor, $sourceHash): array {
            $added = $updated = $skipped = 0;
            $time = $this->time();
            foreach ($rows as $row) {
                $name = trim($row['supplier_name']);
                $values = $this->values($row);
                $existing = $this->query()->where('supplier_name', $name)->lockForUpdate()->first();
                if ($existing === null) {
                    $this->query()->insert(['supplier_name' => $name, 'creator' => $actor, 'created_at' => $time, 'updated_at' => $time] + $values);
                    $added++;
                    continue;
                }
                $same = $existing->deleted_at === null;
                foreach (['mode', 'effective_from', 'effective_to'] as $field) {
                    $same = $same && (string) $existing->{$field} === (string) $values[$field];
                }
                if ($same) {
                    $skipped++;
                    continue;
                }
                $this->query()->where('id', $existing->id)->update($values + ['deleted_at' => null, 'updated_at' => $time]);
                $updated++;
            }
            $this->event(null, $actor, 'import', "导入厂家记账配置：新增{$added}条，更新{$updated}条，未变化{$skipped}条", compact('added', 'updated', 'skipped') + ['source_sha256' => $sourceHash]);

            return compact('added', 'updated', 'skipped');
        });
    }

    public function events()
    {
        return DB::table(self::EVENTS)->orderByDesc('id');
    }

    private function values(array $data): array
    {
        $values = [];
        foreach (self::FIELDS as $field) {
            $value = $data[$field] ?? null;
            $values[$field] = $field === 'source_text' ? mb_substr(trim((string) $value), 0, 255) : (($value === '' || $value === null) ? null : (string) $value);
        }
        abort_unless(isset(Rule::MODES[$values['mode']]), 422, '记账方式无效。');
        if ($values['effective_from'] !== null && $values['effective_to'] !== null && $values['effective_from'] > $values['effective_to']) {
            throw ValidationException::withMessages(['effective_to' => '生效结束日期不能早于开始日期。']);
        }

        return $values;
    }

    private function event(?int $id, string $actor, string $action, string $description, array $details): void
    {
        DB::table(self::EVENTS)->insert(['config_id' => $id, 'actor' => $actor, 'action' => $action, 'description' => mb_substr($description, 0, 1000), 'details' => json_encode($details, JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR), 'created_at' => $this->time()]);
    }

    private function time(): string
    {
        return Carbon::now(config('app.platform_timezone', 'Asia/Shanghai'))->format('Y-m-d H:i:s');
    }
}