<?php

namespace App\Module\Mex\Metrics;

use App\Module\Fund\Enums\FUND_CURRENCY_TYPE;
use App\Module\Mex\Models\MexTransaction;
use App\Module\Mex\Enums\TransactionType;
use Dcat\Admin\Widgets\Metrics\Line;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

/**
 * 农贸市场成交趋势图表 - 多线图（买入，卖出）
 */
class VolumeTrendChart extends Line
{
    /**
     * 商品ID
     */
    protected $itemId;

    /**
     * 商品名称
     */
    protected $itemName;

    /**
     * 构造函数
     */
    public function __construct($itemId = null, $itemName = null)
    {
        $this->itemId = $itemId;
        $this->itemName = $itemName;
        parent::__construct();
    }

    /**
     * 初始化卡片内容
     *
     * @return void
     */
    protected function init()
    {
        parent::init();

        $title = $this->itemName ? "{$this->itemName} - 成交趋势" : '成交趋势';
        $this->title($title);
        $this->height(400);
        $this->chartHeight(300);
        
        // 设置下拉选项
        $this->dropdown([
            '7' => '最近 7 天',
            '14' => '最近 14 天',
            '30' => '最近 30 天',
            '90' => '最近 90 天',
        ]);
    }

    /**
     * 处理请求
     *
     * @param Request $request
     * @return mixed|void
     */
    public function handle(Request $request)
    {
        $days = (int) $request->get('option', 7);
        $itemId = $this->itemId ?? $request->get('item_id');
        $currencyType = $request->get('currency_type', FUND_CURRENCY_TYPE::ZUANSHI->value);

        $data = $this->getVolumeTrendData($days, $itemId, $currencyType);

        // 卡片内容 - 显示总成交量
        $totalVolume = $data['total_volume'] ?? 0;
        $volumeChange = $data['volume_change'] ?? 0;
        $changePercent = $data['change_percent'] ?? 0;

        $changeText = $volumeChange >= 0 ? "+{$changePercent}%" : "{$changePercent}%";
        $this->withContent(number_format($totalVolume), $changeText);

        // 添加详细信息
        $dataCount = count($data['dates']);
        $this->subTitle("数据点: {$dataCount} | 时间范围: {$days}天");

        // 图表数据 - 多线图
        $this->withMultiLineChart($data);
    }

    /**
     * 获取成交趋势数据
     *
     * @param int $days
     * @param int|null $itemId
     * @param int $currencyType
     * @return array
     */
    protected function getVolumeTrendData(int $days, ?int $itemId = null, int $currencyType = 2): array
    {
        $startDate = now()->subDays($days - 1)->toDateString();
        $endDate = now()->toDateString();

        // 构建基础查询
        $query = MexTransaction::selectRaw('
                DATE(created_at) as trade_date,
                transaction_type,
                SUM(quantity) as total_quantity,
                COUNT(*) as transaction_count
            ')
            ->whereBetween(DB::raw('DATE(created_at)'), [$startDate, $endDate])
            ->where('currency_type', $currencyType)
            ->groupBy(DB::raw('DATE(created_at)'), 'transaction_type')
            ->orderBy(DB::raw('DATE(created_at)'));

        if ($itemId) {
            $query->where('item_id', $itemId);
        }

        $transactions = $query->get();

        // 生成日期范围
        $dates = [];
        $current = now()->subDays($days - 1);
        for ($i = 0; $i < $days; $i++) {
            $dates[] = $current->format('m-d');
            $current->addDay();
        }

        // 初始化数据数组
        $buyVolumes = array_fill(0, $days, 0);
        $sellVolumes = array_fill(0, $days, 0);

        // 填充数据
        foreach ($transactions as $transaction) {
            $tradeDate = \Carbon\Carbon::parse($transaction->trade_date);
            $dateIndex = now()->subDays($days - 1)->diffInDays($tradeDate);
            if ($dateIndex >= 0 && $dateIndex < $days) {
                if ($transaction->transaction_type == TransactionType::USER_BUY->value) {
                    $buyVolumes[$dateIndex] = (int) $transaction->total_quantity;
                } elseif ($transaction->transaction_type == TransactionType::USER_SELL->value) {
                    $sellVolumes[$dateIndex] = (int) $transaction->total_quantity;
                }
            }
        }

        // 计算总成交量和变化
        $totalVolume = array_sum($buyVolumes) + array_sum($sellVolumes);
        $recentVolume = end($buyVolumes) + end($sellVolumes);
        $firstVolume = $buyVolumes[0] + $sellVolumes[0];
        
        $volumeChange = $recentVolume - $firstVolume;
        $changePercent = $firstVolume > 0 ? round(($volumeChange / $firstVolume) * 100, 2) : 0;

        return [
            'dates' => $dates,
            'buy_volumes' => $buyVolumes,
            'sell_volumes' => $sellVolumes,
            'total_volume' => $totalVolume,
            'volume_change' => $volumeChange,
            'change_percent' => $changePercent,
        ];
    }

    /**
     * 设置多线图表数据
     *
     * @param array $data
     * @return $this
     */
    public function withMultiLineChart(array $data)
    {
        $series = [
            [
                'name' => '买入量',
                'data' => $data['buy_volumes'],
            ],
            [
                'name' => '卖出量',
                'data' => $data['sell_volumes'],
            ],
        ];

        // 定义不同线条的颜色
        $colors = [
            '#52c41a', // 绿色 - 买入量
            '#f5222d', // 红色 - 卖出量
        ];

        return $this->chart([
            'series' => $series,
            'colors' => $colors,
            'xaxis' => [
                'categories' => $data['dates'],
                'labels' => [
                    'show' => true,
                ],
            ],
            'legend' => [
                'show' => true,
                'position' => 'bottom',
                'horizontalAlign' => 'center'
            ],
            'tooltip' => [
                'shared' => true,
                'intersect' => false,
            ],
            'yaxis' => [
                'title' => [
                    'text' => '成交量'
                ]
            ],
        ]);
    }
}