<?php

namespace app\inquery\utils;

use support\exception\BusinessException;

class FbLeadHeaderMapper
{
    /**
     * Excel 原始表头 => DB 字段名
     * 注意：key 用的是“原始表头字符串”（包括下划线）
     */
    protected array $headerMap = [
        // ===== 基础公共字段 =====
        'id'             => 'fb_lead_id',
        'created_time'   => 'fb_created_time',
        'ad_id'          => 'ad_id',
        'ad_name'        => 'ad_name',
        'adset_id'       => 'adset_id',
        'adset_name'     => 'adset_name',
        'campaign_id'    => 'campaign_id',
        'campaign_name'  => 'campaign_name',
        'form_id'        => 'form_id',
        'form_name'      => 'form_name',
        'is_organic'     => 'is_organic',
        'platform'       => 'platform',

        'full_name'      => 'full_name',
        'phone'          => 'phone',
        'phone_number'   => 'phone',      // 兼容写法
        'email'          => 'email',
        'lead_status'    => 'lead_status',
        'inbox_url'      => 'inbox_url',

        // ===== 车型相关：全部归到 car_model =====
        'which_model_of_this_car_would_you_like_to_purchase?_' => 'car_model',
        'which_model_of_this_car_would_you_like_to_purchase?'  => 'car_model',
        'which_car_model_would_you_like_to_purchase?'          => 'car_model',
        'which_model_do_you_want_to_purchase?'                 => 'car_model',
        'which_model_would_you_like_to_purchase?'              => 'car_model',
        'which_version_do_you_want_to_buy?'                    => 'car_model', // 这里也归到车型/版本字段

        // ===== 数量相关：全部归到 car_quantity =====
        'how_many_cars_would_you_like_to_buy?_'  => 'car_quantity',
        'how_many_cars_would_you_like_to_buy?'   => 'car_quantity',
        '_how_many_cars_would_you_like_to_buy?'  => 'car_quantity',
        'how_many_cars_do_you_buy?'              => 'car_quantity',
        'how_many_cars_do_you_want_to_purchase?' => 'car_quantity',
        'how_many_cars_do_you_want_to_buy?'      => 'car_quantity',
        'what_quantity_do_you_want_to_buy?'      => 'car_quantity',

        // ===== 颜色相关：归到 favorite_color =====
        'what_color_do_you_like?'                 => 'favorite_color',
        'which_color_would_you_like_to_purchase?' => 'favorite_color',

        // ===== 用途相关：归到 usage_type =====
        'are_you_using_it_for_business_or_personal_use?' => 'usage_type',
        'business_use_or_personal_use?'                  => 'usage_type',
        'personal_use_or_business_use?'                  => 'usage_type',

        // ===== 座位数相关 =====
        'do_you_want_to_buy_six_seats_or_seven_seats?'   => 'seat_preference',
    ];

    /**
     * 返回所有支持的 Excel 表头
     */
    public function getSupportedHeaders(): array
    {
        return array_keys($this->headerMap);
    }

    /**
     * 单个表头映射：原始表头 -> DB 字段名
     */
    public function mapHeader(string $rawHeader): ?string
    {
        $key = $this->normalizeHeader($rawHeader);

        return $this->headerMap[$key] ?? null;
    }

    /**
     * 校验一整行表头：
     *  - 有任何不认识的表头，就抛 BusinessException
     */
    public function validateHeaders(array $rawHeaders): void
    {
        $unsupported = [];

        foreach ($rawHeaders as $header) {
            $header = (string)$header;
            $key    = $this->normalizeHeader($header);

            // 允许空表头（多余空列）
            if ($key === '') {
                continue;
            }

            if (!isset($this->headerMap[$key])) {
                $unsupported[] = $header;
            }
        }

        if (!empty($unsupported)) {
            $msg = 'Excel 表头包含未兼容字段：' . implode('、', $unsupported)
                 . '。请检查这些字段是否需要加入映射配置。';
            throw new BusinessException($msg);
        }
    }

    /**
     * 根据第一行表头，构建 “列索引 => DB 字段” 映射
     */
    public function buildColumnFieldMap(array $rawHeaders): array
    {
        // 先做一遍校验（发现问题直接抛异常）
        $this->validateHeaders($rawHeaders);

        $colToField = [];

        foreach ($rawHeaders as $index => $header) {
            $key = $this->normalizeHeader((string)$header);
            if ($key === '') {
                continue;
            }

            $field = $this->headerMap[$key] ?? null;
            if ($field === null) {
                continue; // 理论上不会到这儿，双保险
            }

            $colToField[$index] = $field;
        }

        return $colToField;
    }

    /**
     * 表头标准化：
     * 目前只去 BOM + trim，保持和 headerMap 中 key 完全一致
     * 如果后面再出现“有空格/大小写”的版本，我们可以在这里做 strtolower / 替换空格 为 _
     */
    protected function normalizeHeader(string $header): string
    {
        // 去掉 UTF-8 BOM
        $header = preg_replace('/^\xEF\xBB\xBF/', '', $header);

        // 去掉前后空白
        $header = trim($header);

        return $header;
    }
}