<?php

namespace app\support;

use support\think\Db;

class ExpressCompanyService
{
    public function __construct()
    {
        $this->ensureTable();
        $this->bootstrapDefaults();
    }

    public function list(bool $enabledOnly = false): array
    {
        $query = Db::name('express_companies')
            ->order('is_default', 'desc')
            ->order('sort_order', 'asc')
            ->order('id', 'asc');

        if ($enabledOnly) {
            $query->where('status', 'enabled');
        }

        return array_map(fn (array $item) => $this->format($item), $query->select()->toArray());
    }

    public function save(array $payload, int $id = 0): int
    {
        $now = date('Y-m-d H:i:s');
        $companyName = trim((string)($payload['company_name'] ?? ''));
        $companyCode = trim((string)($payload['company_code'] ?? ''));
        $status = trim((string)($payload['status'] ?? 'enabled'));
        $isDefault = !empty($payload['is_default']);

        if ($companyName === '') {
            throw new \RuntimeException('快递公司名称不能为空');
        }
        if (!in_array($status, ['enabled', 'disabled'], true)) {
            throw new \RuntimeException('快递公司状态无效');
        }
        if ($isDefault && $status !== 'enabled') {
            throw new \RuntimeException('默认快递公司必须保持启用');
        }
        if ($companyCode === '') {
            $companyCode = $this->generateCompanyCode($companyName);
        }

        $existsByName = Db::name('express_companies')
            ->where('company_name', $companyName)
            ->when($id > 0, fn ($query) => $query->where('id', '<>', $id))
            ->find();
        if ($existsByName) {
            throw new \RuntimeException('快递公司名称已存在');
        }

        $existsByCode = Db::name('express_companies')
            ->where('company_code', $companyCode)
            ->when($id > 0, fn ($query) => $query->where('id', '<>', $id))
            ->find();
        if ($existsByCode) {
            throw new \RuntimeException('快递公司编码已存在');
        }

        $data = [
            'company_name' => $companyName,
            'company_code' => $companyCode,
            'status' => $status,
            'is_default' => $isDefault ? 1 : 0,
            'sort_order' => (int)($payload['sort_order'] ?? 0),
            'remark' => trim((string)($payload['remark'] ?? '')),
            'updated_at' => $now,
        ];

        Db::startTrans();
        try {
            if ($isDefault) {
                Db::name('express_companies')->update([
                    'is_default' => 0,
                    'updated_at' => $now,
                ]);
            }

            if ($id > 0) {
                Db::name('express_companies')->where('id', $id)->update($data);
                $companyId = $id;
            } else {
                $data['created_at'] = $now;
                $companyId = (int)Db::name('express_companies')->insertGetId($data);
            }

            $this->ensureEnabledDefault($now);
            Db::commit();
        } catch (\Throwable $e) {
            Db::rollback();
            throw $e;
        }

        return $companyId;
    }

    public function defaultName(): string
    {
        $row = Db::name('express_companies')
            ->where('status', 'enabled')
            ->where('is_default', 1)
            ->find();

        if (!$row) {
            $row = Db::name('express_companies')
                ->where('status', 'enabled')
                ->order('sort_order', 'asc')
                ->order('id', 'asc')
                ->find();
        }

        return trim((string)($row['company_name'] ?? ''));
    }

    private function format(array $item): array
    {
        $status = (string)($item['status'] ?? 'enabled');

        return [
            'id' => (int)$item['id'],
            'company_name' => (string)$item['company_name'],
            'company_code' => (string)$item['company_code'],
            'status' => $status,
            'status_text' => $status === 'enabled' ? '启用中' : '已停用',
            'is_default' => (bool)$item['is_default'],
            'sort_order' => (int)$item['sort_order'],
            'remark' => (string)($item['remark'] ?? ''),
            'created_at' => (string)($item['created_at'] ?? ''),
            'updated_at' => (string)($item['updated_at'] ?? ''),
        ];
    }

    private function bootstrapDefaults(): void
    {
        $now = date('Y-m-d H:i:s');
        $exists = Db::name('express_companies')->where('company_name', '顺丰速运')->find();
        if (!$exists) {
            Db::name('express_companies')->insert([
                'company_name' => '顺丰速运',
                'company_code' => 'sf_express',
                'status' => 'enabled',
                'is_default' => 1,
                'sort_order' => 1,
                'remark' => '系统默认快递公司',
                'created_at' => $now,
                'updated_at' => $now,
            ]);
        }

        $this->ensureEnabledDefault($now);
    }

    private function ensureEnabledDefault(string $now): void
    {
        $default = Db::name('express_companies')
            ->where('status', 'enabled')
            ->where('is_default', 1)
            ->find();
        if ($default) {
            return;
        }

        $firstEnabled = Db::name('express_companies')
            ->where('status', 'enabled')
            ->order('sort_order', 'asc')
            ->order('id', 'asc')
            ->find();
        if ($firstEnabled) {
            Db::name('express_companies')->where('id', $firstEnabled['id'])->update([
                'is_default' => 1,
                'updated_at' => $now,
            ]);
        }
    }

    private function generateCompanyCode(string $companyName): string
    {
        return 'express_' . substr(hash('sha256', $companyName), 0, 12);
    }

    private function ensureTable(): void
    {
        Db::execute(<<<'SQL'
CREATE TABLE IF NOT EXISTS express_companies (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  company_name VARCHAR(64) NOT NULL DEFAULT '',
  company_code VARCHAR(64) NOT NULL DEFAULT '',
  status VARCHAR(32) NOT NULL DEFAULT 'enabled',
  is_default TINYINT(1) NOT NULL DEFAULT 0,
  sort_order INT NOT NULL DEFAULT 0,
  remark VARCHAR(255) NOT NULL DEFAULT '',
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (id),
  UNIQUE KEY uk_express_companies_name (company_name),
  UNIQUE KEY uk_express_companies_code (company_code),
  KEY idx_express_companies_status (status),
  KEY idx_express_companies_default (is_default)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='快递公司字典'
SQL);
    }
}