<?php
namespace App\Services;

use Db\Database;

class ReportService {
    private $db;

    public function __construct(Database $db) {
        $this->db = $db;
    }

    /**
     * 前台用户报表：按投注类型分组统计
     *
     * @param int    $userId    用户ID
     * @param string $dateFrom  开始日期 (Y-m-d)
     * @param string $dateTo    结束日期 (Y-m-d)
     * @return array
     */
    public function getUserReport(int $userId, string $dateFrom, string $dateTo): array
    {
        $rangeFrom = $dateFrom . ' 00:00:00';
        $rangeTo = $dateTo . ' 23:59:59';

        $pdo = $this->db->medoo->pdo;
        try {
            // 投注统计（有效流水 = 已结算投注额，排除 pending）
            $stmt = $pdo->prepare("
                SELECT
                    bet_type as type,
                    COUNT(*) as bet_count,
                    SUM(amount) as amount,
                    SUM(CASE WHEN status IN ('win','lose') THEN amount ELSE 0 END) as effective_flow,
                    SUM(CASE
                        WHEN status='win' THEN win_amount
                        WHEN status='lose' THEN -amount
                        ELSE 0
                    END) as win_loss
                FROM bets
                WHERE user_id = ? AND created_at BETWEEN ? AND ?
                GROUP BY bet_type
                ORDER BY bet_type
            ");
            $stmt->execute([$userId, $rangeFrom, $rangeTo]);
            $rows = $stmt->fetchAll(\PDO::FETCH_ASSOC);

            // 退水（代理返佣给该用户的金额）
            $rebateTotal = 0;
            try {
                $stmt2 = $pdo->prepare("
                    SELECT COALESCE(SUM(commission), 0) as total
                    FROM agent_commissions
                    WHERE from_user_id = ? AND type = 'rebate' AND created_at BETWEEN ? AND ?
                ");
                $stmt2->execute([$userId, $rangeFrom, $rangeTo]);
                $rebateTotal = floatval($stmt2->fetch(\PDO::FETCH_ASSOC)['total'] ?? 0);
            } catch (\Exception $e) {
                $rebateTotal = 0;
            }

            // 将退水按比例分配到各类型（或全部放在第一行）
            $totalBet = array_sum(array_column($rows, 'amount'));
            foreach ($rows as &$row) {
                $row['amount'] = floatval($row['amount']);
                $row['effective_flow'] = floatval($row['effective_flow']);
                $row['win_loss'] = floatval($row['win_loss']);
                // 按投注额占比分配退水
                $ratio = $totalBet > 0 ? $row['amount'] / $totalBet : 0;
                $row['rebate'] = round($rebateTotal * $ratio, 2);
            }
            unset($row);

            return $rows;
        } catch (\Exception $e) {
            return [];
        }
    }

    /**
     * 后台总体统计
     *
     * @param string $dateFrom  开始日期 (Y-m-d)
     * @param string $dateTo    结束日期 (Y-m-d)
     * @return array
     */
    public function getOverviewStats(string $dateFrom, string $dateTo): array
    {
        $range = [$dateFrom . ' 00:00:00', $dateTo . ' 23:59:59'];
        $pdo = $this->db->medoo->pdo;

        // 总投注（排除虚拟）
        $totalBet = $this->db->sum('bets', 'amount', [
            'is_virtual' => 0, 'created_at[<>]' => $range
        ]) ?: 0;

        // 总派奖
        $totalWin = $this->db->sum('bets', 'win_amount', [
            'is_virtual' => 0, 'status' => 'win', 'created_at[<>]' => $range
        ]) ?: 0;

        // 平台利润
        $profit = $totalBet - $totalWin;
        $profitRate = $totalBet > 0 ? round($profit / $totalBet * 100, 2) : 0;

        // 总充值
        $totalDeposit = $this->db->sum('transactions', 'amount', [
            'is_virtual' => 0, 'type[~]' => '%deposit%', 'amount[>]' => 0,
            'created_at[<>]' => $range
        ]) ?: 0;

        // 总提现
        $totalWithdraw = abs($this->db->sum('transactions', 'amount', [
            'is_virtual' => 0, 'type[~]' => '%withdraw%', 'amount[<]' => 0,
            'created_at[<>]' => $range
        ]) ?: 0);

        // 代理佣金
        $totalCommission = $this->db->sum('agent_commissions', 'commission', [
            'created_at[<>]' => $range
        ]) ?: 0;

        // 反水
        $totalRebate = $this->db->sum('agent_commissions', 'commission', [
            'type' => 'rebate', 'created_at[<>]' => $range
        ]) ?: 0;

        // 用户统计
        $totalUsers = $this->db->count('users', ['is_virtual' => 0]);
        $newUsers = $this->db->count('users', [
            'is_virtual' => 0, 'created_at[<>]' => $range
        ]);

        // 活跃用户数（有投注记录的非虚拟用户）
        $activeUsers = 0;
        try {
            $stmt = $pdo->prepare("SELECT COUNT(DISTINCT user_id) as cnt FROM bets WHERE is_virtual = 0 AND created_at BETWEEN ? AND ?");
            $stmt->execute([$range[0], $range[1]]);
            $activeUsers = (int)($stmt->fetch(\PDO::FETCH_ASSOC)['cnt'] ?? 0);
        } catch (\Exception $e) {
            $activeUsers = 0;
        }

        return compact(
            'totalBet', 'totalWin', 'profit', 'profitRate',
            'totalDeposit', 'totalWithdraw', 'totalCommission', 'totalRebate',
            'totalUsers', 'newUsers', 'activeUsers'
        );
    }

    /**
     * 日明细统计
     *
     * @param string $dateFrom  开始日期 (Y-m-d)
     * @param string $dateTo    结束日期 (Y-m-d)
     * @return array
     */
    public function getDailyStats(string $dateFrom, string $dateTo): array
    {
        $range = [$dateFrom . ' 00:00:00', $dateTo . ' 23:59:59'];
        $pdo = $this->db->medoo->pdo;

        $dailyStats = [];
        try {
            $stmt = $pdo->prepare("
                SELECT
                    DATE(created_at) as date,
                    SUM(amount) as total_bet,
                    SUM(CASE WHEN status='win' THEN win_amount ELSE 0 END) as total_win,
                    COUNT(*) as bet_count,
                    SUM(CASE WHEN status='win' THEN 1 ELSE 0 END) as win_count
                FROM bets
                WHERE is_virtual = 0 AND created_at BETWEEN ? AND ?
                GROUP BY DATE(created_at)
                ORDER BY date DESC
            ");
            $stmt->execute([$range[0], $range[1]]);
            $dailyStats = $stmt->fetchAll(\PDO::FETCH_ASSOC);
        } catch (\Exception $e) {
            return [];
        }

        // 补充每日充提数据
        foreach ($dailyStats as &$day) {
            $dr = [$day['date'] . ' 00:00:00', $day['date'] . ' 23:59:59'];
            $day['deposits'] = $this->db->sum('transactions', 'amount', [
                'is_virtual' => 0, 'type[~]' => '%deposit%', 'amount[>]' => 0,
                'created_at[<>]' => $dr
            ]) ?: 0;
            $day['withdraws'] = abs($this->db->sum('transactions', 'amount', [
                'is_virtual' => 0, 'type[~]' => '%withdraw%', 'amount[<]' => 0,
                'created_at[<>]' => $dr
            ]) ?: 0);
            $day['total_bet'] = floatval($day['total_bet'] ?? 0);
            $day['total_win'] = floatval($day['total_win'] ?? 0);
            $day['bet_count'] = intval($day['bet_count'] ?? 0);
            $day['win_count'] = intval($day['win_count'] ?? 0);
            $day['profit'] = $day['total_bet'] - $day['total_win'];
            $day['win_rate'] = $day['bet_count'] > 0 ? round($day['win_count'] / $day['bet_count'] * 100, 1) : 0;
        }
        unset($day);

        return $dailyStats;
    }

    /**
     * 用户输赢明细（含日维度分组 + 用户汇总）
     *
     * @param string $dateFrom  开始日期 (Y-m-d)
     * @param string $dateTo    结束日期 (Y-m-d)
     * @return array ['raw' => 原始行, 'summary' => 按用户汇总]
     */
    public function getUserWinLoss(string $dateFrom, string $dateTo): array
    {
        $range = [$dateFrom . ' 00:00:00', $dateTo . ' 23:59:59'];
        $pdo = $this->db->medoo->pdo;

        $userWinLoss = [];
        try {
            $stmt = $pdo->prepare("
                SELECT u.id as user_id, u.username, u.balance,
                       DATE(b.created_at) as date,
                       SUM(b.amount) as total_bet,
                       SUM(CASE WHEN b.status='win' THEN b.win_amount ELSE 0 END) as total_win,
                       COUNT(*) as bet_count,
                       SUM(CASE WHEN b.status='win' THEN 1 ELSE 0 END) as win_count
                FROM bets b
                JOIN users u ON b.user_id = u.id
                WHERE b.is_virtual = 0 AND b.created_at BETWEEN ? AND ?
                GROUP BY b.user_id, DATE(b.created_at)
                ORDER BY u.username, date DESC
            ");
            $stmt->execute([$range[0], $range[1]]);
            $userWinLoss = $stmt->fetchAll(\PDO::FETCH_ASSOC);
        } catch (\Exception $e) {
            return ['raw' => [], 'summary' => []];
        }

        // 按用户汇总
        $userSummary = [];
        foreach ($userWinLoss as $row) {
            $uid = $row['user_id'];
            if (!isset($userSummary[$uid])) {
                $userSummary[$uid] = [
                    'username' => $row['username'],
                    'balance' => floatval($row['balance']),
                    'total_bet' => 0, 'total_win' => 0,
                    'bet_count' => 0, 'win_count' => 0,
                    'days' => []
                ];
            }
            $bet = floatval($row['total_bet']);
            $win = floatval($row['total_win']);
            $userSummary[$uid]['total_bet'] += $bet;
            $userSummary[$uid]['total_win'] += $win;
            $userSummary[$uid]['bet_count'] += intval($row['bet_count']);
            $userSummary[$uid]['win_count'] += intval($row['win_count']);
            $userSummary[$uid]['days'][] = [
                'date' => $row['date'],
                'bet' => $bet, 'win' => $win,
                'profit' => $bet - $win,
                'count' => intval($row['bet_count']),
            ];
        }
        // 排序：按总投注额降序
        uasort($userSummary, function($a, $b) { return $b['total_bet'] <=> $a['total_bet']; });

        return ['raw' => $userWinLoss, 'summary' => $userSummary];
    }

    /**
     * 用户排行（投注额 TOP N）
     *
     * @param string $dateFrom  开始日期 (Y-m-d)
     * @param string $dateTo    结束日期 (Y-m-d)
     * @param int    $limit     条数限制，0=不限
     * @return array
     */
    public function getTopUsers(string $dateFrom, string $dateTo, int $limit = 20): array
    {
        $range = [$dateFrom . ' 00:00:00', $dateTo . ' 23:59:59'];
        $pdo = $this->db->medoo->pdo;

        $sql = "
            SELECT u.username,
                   SUM(b.amount) as total_bet,
                   SUM(CASE WHEN b.status='win' THEN b.win_amount ELSE 0 END) as total_win,
                   SUM(b.amount) - SUM(CASE WHEN b.status='win' THEN b.win_amount ELSE 0 END) as profit,
                   COUNT(*) as bet_count
            FROM bets b
            JOIN users u ON b.user_id = u.id
            WHERE b.is_virtual = 0 AND b.created_at BETWEEN ? AND ?
            GROUP BY b.user_id
            ORDER BY total_bet DESC
        ";
        if ($limit > 0) {
            $sql .= " LIMIT " . intval($limit);
        }

        try {
            $stmt = $pdo->prepare($sql);
            $stmt->execute([$range[0], $range[1]]);
            return $stmt->fetchAll(\PDO::FETCH_ASSOC);
        } catch (\Exception $e) {
            return [];
        }
    }

    /**
     * 代理报表
     *
     * @param string $dateFrom  开始日期 (Y-m-d)
     * @param string $dateTo    结束日期 (Y-m-d)
     * @return array
     */
    public function getAgentStats(string $dateFrom, string $dateTo): array
    {
        $range = [$dateFrom . ' 00:00:00', $dateTo . ' 23:59:59'];

        $agentStats = [];
        $agents = $this->db->select('agents', '*', ['status' => 1]);
        foreach ($agents as $ag) {
            $playerIds = $this->db->select('users', 'id', ['agent_id' => $ag['id'], 'is_virtual' => 0]);
            $agBet = 0;
            $agWin = 0;
            if (!empty($playerIds)) {
                $agBet = $this->db->sum('bets', 'amount', ['user_id' => $playerIds, 'is_virtual' => 0, 'created_at[<>]' => $range]) ?: 0;
                $agWin = $this->db->sum('bets', 'win_amount', ['user_id' => $playerIds, 'is_virtual' => 0, 'status' => 'win', 'created_at[<>]' => $range]) ?: 0;
            }
            $agComm = $this->db->sum('agent_commissions', 'commission', ['agent_id' => $ag['id'], 'created_at[<>]' => $range]) ?: 0;
            $agentStats[] = [
                'agent' => $ag,
                'user' => $this->db->get('users', ['username'], ['id' => $ag['user_id']]),
                'players' => count($playerIds),
                'bets' => $agBet,
                'wins' => $agWin,
                'commission' => $agComm,
                'profit' => $agBet - $agWin - $agComm,
            ];
        }

        return $agentStats;
    }
}