<?php
namespace App\Services;

use Db\Database;

class FollowPlanService {
    private $db;

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

    /**
     * 获取所有启用的跟单计划（前台展示）
     */
    public function getActivePlans(int $gameId = 0): array
    {
        $where = ['status' => 1];
        if ($gameId > 0) $where['game_id'] = $gameId;
        $where['ORDER'] = ['id' => 'ASC'];

        $plans = $this->db->select('follow_plans', '*', $where);
        foreach ($plans as &$plan) {
            $stats = $this->getPlanStats($plan['id']);
            $plan['total_records'] = $stats['total'];
            $plan['win_count'] = $stats['wins'];
            $plan['win_rate'] = $stats['total'] > 0 ? round($stats['wins'] / $stats['total'] * 100, 1) : 0;
            // 最近 10 期记录
            $plan['recent'] = $this->db->select('follow_plan_records', '*', [
                'plan_id' => $plan['id'],
                'is_win[!]' => null,
                'ORDER' => ['id' => 'DESC'],
                'LIMIT' => 10
            ]);
        }
        unset($plan);
        return $plans;
    }

    /**
     * 获取计划统计
     */
    public function getPlanStats(int $planId): array
    {
        $total = $this->db->count('follow_plan_records', [
            'plan_id' => $planId,
            'is_win[!]' => null
        ]);
        $wins = $this->db->count('follow_plan_records', [
            'plan_id' => $planId,
            'is_win' => 1
        ]);
        return ['total' => $total, 'wins' => $wins];
    }

    /**
     * 获取用户的跟单状态
     */
    public function getUserFollowStatus(int $userId): array
    {
        $rows = $this->db->select('user_follow_plans', '*', [
            'user_id' => $userId,
            'is_active' => 1
        ]);
        $result = [];
        foreach ($rows as $r) {
            $result[$r['plan_id']] = $r;
        }
        return $result;
    }

    /**
     * 用户开始/停止跟单
     */
    public function toggleFollow(int $userId, int $planId): array
    {
        $existing = $this->db->get('user_follow_plans', '*', [
            'user_id' => $userId,
            'plan_id' => $planId
        ]);

        if ($existing) {
            $newStatus = $existing['is_active'] ? 0 : 1;
            $this->db->update('user_follow_plans', ['is_active' => $newStatus], [
                'id' => $existing['id']
            ]);
            return ['success' => true, 'active' => $newStatus];
        }

        // 新建
        $plan = $this->db->get('follow_plans', '*', ['id' => $planId, 'status' => 1]);
        if (!$plan) {
            return ['success' => false, 'message' => '计划不存在或已禁用'];
        }

        $this->db->insert('user_follow_plans', [
            'user_id' => $userId,
            'plan_id' => $planId,
            'is_active' => 1,
        ]);
        return ['success' => true, 'active' => 1];
    }

    /**
     * 获取用户跟单汇总（总胜率、总盈亏）
     */
    public function getUserSummary(int $userId): array
    {
        $pdo = $this->db->medoo->pdo;
        $totalWinRate = 0;
        $totalProfit = 0;

        try {
            $stmt = $pdo->prepare("
                SELECT SUM(total_bets) as bets, SUM(total_wins) as wins, SUM(total_profit) as profit
                FROM user_follow_plans WHERE user_id = ?
            ");
            $stmt->execute([$userId]);
            $row = $stmt->fetch(\PDO::FETCH_ASSOC);
            $bets = intval($row['bets'] ?? 0);
            $wins = intval($row['wins'] ?? 0);
            $totalWinRate = $bets > 0 ? round($wins / $bets * 100, 1) : 0;
            $totalProfit = floatval($row['profit'] ?? 0);
        } catch (\Exception $e) {}

        return ['win_rate' => $totalWinRate, 'profit' => $totalProfit];
    }

    // ===== 后台管理 =====

    /**
     * 获取所有计划（后台）
     */
    public function getAllPlans(): array
    {
        $plans = $this->db->select('follow_plans', '*', ['ORDER' => ['id' => 'DESC']]);
        foreach ($plans as &$plan) {
            $stats = $this->getPlanStats($plan['id']);
            $plan['total_records'] = $stats['total'];
            $plan['win_count'] = $stats['wins'];
            $plan['win_rate'] = $stats['total'] > 0 ? round($stats['wins'] / $stats['total'] * 100, 1) : 0;
            $plan['follower_count'] = $this->db->count('user_follow_plans', [
                'plan_id' => $plan['id'], 'is_active' => 1
            ]);
        }
        unset($plan);
        return $plans;
    }

    /**
     * 创建/更新计划
     */
    public function savePlan(array $data): array
    {
        $fields = [
            'game_id' => intval($data['game_id'] ?? 1),
            'name' => trim($data['name'] ?? ''),
            'plan_type' => trim($data['plan_type'] ?? 'bs'),
            'target_rank' => intval($data['target_rank'] ?? 1),
            'strategy' => trim($data['strategy'] ?? 'follow'),
            'bet_amount' => floatval($data['bet_amount'] ?? 100),
            'status' => intval($data['status'] ?? 1),
        ];

        if (empty($fields['name'])) {
            return ['success' => false, 'message' => '计划名称不能为空'];
        }

        $id = intval($data['id'] ?? 0);
        if ($id > 0) {
            $this->db->update('follow_plans', $fields, ['id' => $id]);
        } else {
            $fields['created_by'] = intval($data['created_by'] ?? 0);
            $this->db->insert('follow_plans', $fields);
            $id = intval($this->db->id());
        }

        return ['success' => true, 'id' => $id];
    }

    /**
     * 删除计划
     */
    public function deletePlan(int $planId): array
    {
        $this->db->delete('follow_plan_records', ['plan_id' => $planId]);
        $this->db->delete('user_follow_plans', ['plan_id' => $planId]);
        $this->db->delete('follow_plans', ['id' => $planId]);
        return ['success' => true];
    }

    /**
     * 添加计划推荐记录（由 cron 或后台手动触发）
     */
    public function addRecord(int $planId, int $periodId, string $periodNumber, string $recommendValue): array
    {
        $exists = $this->db->get('follow_plan_records', 'id', [
            'plan_id' => $planId, 'period_id' => $periodId
        ]);
        if ($exists) {
            return ['success' => false, 'message' => '该期已有推荐记录'];
        }

        $this->db->insert('follow_plan_records', [
            'plan_id' => $planId,
            'period_id' => $periodId,
            'period_number' => $periodNumber,
            'recommend_value' => $recommendValue,
        ]);
        return ['success' => true, 'id' => intval($this->db->id())];
    }

    /**
     * 结算推荐记录（开奖后调用）
     */
    public function settleRecord(int $recordId, string $resultValue, bool $isWin): void
    {
        $this->db->update('follow_plan_records', [
            'result_value' => $resultValue,
            'is_win' => $isWin ? 1 : 0,
        ], ['id' => $recordId]);

        // 更新所有跟了这个计划的用户统计
        $record = $this->db->get('follow_plan_records', '*', ['id' => $recordId]);
        if (!$record) return;

        $plan = $this->db->get('follow_plans', '*', ['id' => $record['plan_id']]);
        if (!$plan) return;

        $betAmount = floatval($plan['bet_amount']);
        $profit = $isWin ? $betAmount * 0.95 : -$betAmount; // 简化盈亏计算

        $followers = $this->db->select('user_follow_plans', '*', [
            'plan_id' => $record['plan_id'], 'is_active' => 1
        ]);

        foreach ($followers as $f) {
            $this->db->update('user_follow_plans', [
                'total_bets[+]' => 1,
                'total_wins[+]' => $isWin ? 1 : 0,
                'total_profit[+]' => $profit,
            ], ['id' => $f['id']]);
        }
    }
}