<?php

namespace App\Services;

use Illuminate\Support\Facades\DB;

/**
 * 报表服务类
 * 处理各类统计报表
 */
class ReportService
{
    /**
     * 获取预约总体统计报表
     *
     * @param string $dateType 日期类型: daily-日报, weekly-周报, monthly-月报
     * @param string $startDate 开始日期 YYYY-MM-DD
     * @param string $endDate 结束日期 YYYY-MM-DD
     * @param int|null $departmentId 科室ID
     * @param int|null $channelId 渠道ID
     * @param int|null $patientType 患者类型
     * @return array
     */
    public function getAppointmentOverallReport($dateType, $startDate, $endDate, $departmentId = null, $channelId = null, $patientType = null)
    {
        // 验证日期范围
        if ($startDate > $endDate) {
            return ['success' => false, 'message' => '开始日期不能大于结束日期'];
        }

        // 根据日期类型确定分组粒度
        $dateFormat = $this->getDateFormatByType($dateType);
        $groupByRaw = $this->getGroupByRawByType($dateType);

        // 构建查询
        $query = DB::table('exam_appointment as ea')
            ->leftJoin('exam_application as eapp', 'ea.exam_application_id', '=', 'eapp.id')
            ->leftJoin('department as d', 'eapp.examination_department_code', '=', 'd.code')
            ->leftJoin('channel as c', 'ea.channel_id', '=', 'c.id')
            ->leftJoin('department_resource as dr', 'ea.department_resource_id', '=', 'dr.id')
            ->whereDate('ea.appointment_time', '>=', $startDate)
            ->whereDate('ea.appointment_time', '<=', $endDate)
            ->select([
                DB::raw("$dateFormat as date_label"),
                DB::raw('COUNT(*) as total_appointments'),
                DB::raw('SUM(CASE WHEN ea.status = 1 THEN 1 ELSE 0 END) as booked_count'),
                DB::raw('SUM(CASE WHEN ea.status = 2 THEN 1 ELSE 0 END) as checked_in_count'),
                DB::raw('SUM(CASE WHEN ea.status = 3 THEN 1 ELSE 0 END) as completed_count'),
                DB::raw('SUM(CASE WHEN ea.status = 4 THEN 1 ELSE 0 END) as cancelled_count'),
                DB::raw('SUM(CASE WHEN ea.status = 5 THEN 1 ELSE 0 END) as no_show_count'),
            ]);

        // 科室筛选
        if ($departmentId != null) {
            $query->where('d.id', $departmentId);
        }

        // 渠道筛选
        if ($channelId != null) {
            $query->where('ea.channel_id', $channelId);
        }

        // 患者类型筛选
        if ($patientType != null) {
            $query->where('eapp.patient_type', $patientType);
        }

        // 分组查询
        $data = $query->groupByRaw($groupByRaw)
            ->orderBy('date_label')
            ->get()
            ->map(function ($item) {
                // 计算百分比
                $total = $item->total_appointments ?: 1; // 避免除零
                $bookedTotal = $item->booked_count ?: 1; // 避免除零
                $item->success_rate = round(($item->booked_count / $total) * 100, 2);
                $item->check_in_rate = round(($item->checked_in_count / $bookedTotal) * 100, 2);
                $item->completion_rate = round(($item->completed_count / $bookedTotal) * 100, 2);
                // 取消率和爽约率基于预约总数计算
                $item->cancel_rate = round(($item->cancelled_count / $total) * 100, 2);
                $item->no_show_rate = round(($item->no_show_count / $total) * 100, 2);
                return $item;
            });

        // 计算汇总数据
        $summary = $this->calculateSummary($data);

        return [
            'success' => true,
            'data' => [
                'list' => $data,
                'summary' => $summary,
                'report_type' => $this->getReportTypeName($dateType),
                'date_range' => [
                    'start' => $startDate,
                    'end' => $endDate
                ]
            ]
        ];
    }

    /**
     * 根据日期类型获取日期格式
     */
    private function getDateFormatByType($dateType)
    {
        switch ($dateType) {
            case 'weekly':
                return "CONCAT(DATE_FORMAT(DATE_SUB(ea.appointment_time, INTERVAL WEEKDAY(ea.appointment_time) DAY), '%m/%d'), ' - ', DATE_FORMAT(DATE_ADD(DATE_SUB(ea.appointment_time, INTERVAL WEEKDAY(ea.appointment_time) DAY), INTERVAL 6 DAY), '%m/%d'))";
            case 'monthly':
                return "DATE_FORMAT(ea.appointment_time, '%Y-%m')";
            case 'daily':
            default:
                return "DATE(ea.appointment_time)";
        }
    }

    /**
     * 根据日期类型获取分组字段
     */
    private function getGroupByRawByType($dateType)
    {
        switch ($dateType) {
            case 'weekly':
                return "CONCAT(DATE_FORMAT(DATE_SUB(ea.appointment_time, INTERVAL WEEKDAY(ea.appointment_time) DAY), '%m/%d'), ' - ', DATE_FORMAT(DATE_ADD(DATE_SUB(ea.appointment_time, INTERVAL WEEKDAY(ea.appointment_time) DAY), INTERVAL 6 DAY), '%m/%d'))";
            case 'monthly':
                return "DATE_FORMAT(ea.appointment_time, '%Y-%m')";
            case 'daily':
            default:
                return "DATE(ea.appointment_time)";
        }
    }

    /**
     * 获取报表类型名称
     */
    private function getReportTypeName($dateType)
    {
        $names = [
            'daily' => '日报',
            'weekly' => '周报',
            'monthly' => '月报'
        ];
        return $names[$dateType] ?? '日报';
    }

    /**
     * 计算汇总数据
     */
    private function calculateSummary($data)
    {
        if ($data->isEmpty()) {
            return [
                'total_appointments' => 0,
                'total_booked' => 0,
                'total_checked_in' => 0,
                'total_completed' => 0,
                'total_cancelled' => 0,
                'total_no_show' => 0,
                'avg_check_in_rate' => 0,
                'avg_completion_rate' => 0,
                'avg_cancel_rate' => 0,
                'avg_no_show_rate' => 0
            ];
        }

        $summary = [
            'total_appointments' => 0,
            'total_booked' => 0,
            'total_checked_in' => 0,
            'total_completed' => 0,
            'total_cancelled' => 0,
            'total_no_show' => 0
        ];

        foreach ($data as $item) {
            $summary['total_appointments'] += $item->total_appointments;
            $summary['total_booked'] += $item->booked_count;
            $summary['total_checked_in'] += $item->checked_in_count;
            $summary['total_completed'] += $item->completed_count;
            $summary['total_cancelled'] += $item->cancelled_count;
            $summary['total_no_show'] += $item->no_show_count;
        }

        // 计算平均比率
        // 取消率和爽约率基于预约总数计算（因为预约可能直接被取消）
        // 到检率和完成率基于预约成功数计算
        $totalBooked = $summary['total_booked'] ?: 1;
        $totalAppointments = $summary['total_appointments'] ?: 1;

        $summary['avg_check_in_rate'] = round(($summary['total_checked_in'] / $totalBooked) * 100, 2);
        $summary['avg_completion_rate'] = round(($summary['total_completed'] / $totalBooked) * 100, 2);
        $summary['avg_cancel_rate'] = round(($summary['total_cancelled'] / $totalAppointments) * 100, 2);
        $summary['avg_no_show_rate'] = round(($summary['total_no_show'] / $totalAppointments) * 100, 2);

        return $summary;
    }

    /**
     * 获取时间段分布报表（检查室 × 时间段矩阵）
     *
     * @param string $startDate 开始日期 YYYY-MM-DD
     * @param string $endDate 结束日期 YYYY-MM-DD
     * @param int|null $departmentId 科室 ID
     * @param int|null $resourceId 资源 ID（多资源逗号分隔）
     * @param int|null $channelId 渠道 ID
     * @param int|null $patientType 患者类型
     * @return array
     */
    public function getTimeDistributionReport($startDate, $endDate, $departmentId = null, $resourceId = null, $channelId = null, $patientType = null)
    {
        if ($startDate > $endDate) {
            return ['success' => false, 'message' => '开始日期不能大于结束日期'];
        }

        $timeSlots = [
            '08:00-09:00', '09:00-10:00', '10:00-11:00', '11:00-12:00',
            '12:00-13:00', '13:00-14:00', '14:00-15:00', '15:00-16:00',
            '16:00-17:00', '17:00-18:00', '18:00-19:00', '19:00-20:00'
        ];

        $resourcesQuery = DB::table('department_resource as dr')
            ->leftJoin('department as d', 'dr.department_id', '=', 'd.id')
            ->where('dr.deleted', 0)
            ->where('dr.status', 1)
            ->select('dr.id', 'dr.name as resource_name', 'dr.department_id', 'd.name as department_name');

        if ($departmentId != null && $departmentId !== '') {
            $resourcesQuery->where('dr.department_id', $departmentId);
        }

        if ($resourceId != null && $resourceId !== '') {
            $resourceIds = is_array($resourceId) ? $resourceId : explode(',', $resourceId);
            $resourcesQuery->whereIn('dr.id', $resourceIds);
        }

        $resources = $resourcesQuery->orderBy('dr.department_id', 'asc')
            ->orderBy('dr.id', 'asc')
            ->get()
            ->keyBy('id');

        if ($resources->isEmpty()) {
            return [
                'success' => true,
                'data' => [
                    'resources' => [],
                    'time_slots' => $timeSlots,
                    'matrix' => [],
                    'date_range' => ['start' => $startDate, 'end' => $endDate]
                ]
            ];
        }

        $appointmentsQuery = DB::table('exam_appointment as ea')
            ->leftJoin('plan as p', 'ea.time_slot_id', '=', 'p.id')
            ->leftJoin('plan_batch as pb', 'p.batch_id', '=', 'pb.id')
            ->leftJoin('exam_application as eapp', 'ea.exam_application_id', '=', 'eapp.id')
            ->leftJoin('channel as c', 'ea.channel_id', '=', 'c.id')
            ->whereDate('pb.plan_date', '>=', $startDate)
            ->whereDate('pb.plan_date', '<=', $endDate)
            ->where('pb.deleted', 0)
            ->where('p.deleted', 0);

        if ($departmentId != null && $departmentId !== '') {
            $appointmentsQuery->where('pb.department_id', $departmentId);
        }

        if ($resourceId != null && $resourceId !== '') {
            $resourceIds = is_array($resourceId) ? $resourceId : explode(',', $resourceId);
            $appointmentsQuery->whereIn('ea.department_resource_id', $resourceIds);
        }

        if ($channelId != null && $channelId !== '') {
            $appointmentsQuery->where('ea.channel_id', $channelId);
        }

        if ($patientType != null && $patientType !== '') {
            $appointmentsQuery->where('eapp.patient_type', $patientType);
        }

        $appointmentStats = $appointmentsQuery
            ->select([
                'ea.department_resource_id',
                DB::raw("TIME_FORMAT(p.start_time, '%H:00') as hour_time"),
                DB::raw('COUNT(*) as appointment_count'),
                DB::raw('SUM(CASE WHEN ea.status = 2 THEN 1 ELSE 0 END) as checked_in_count'),
                DB::raw('SUM(CASE WHEN ea.status = 3 THEN 1 ELSE 0 END) as completed_count'),
                DB::raw('SUM(CASE WHEN ea.status = 4 THEN 1 ELSE 0 END) as cancelled_count'),
                DB::raw('SUM(CASE WHEN ea.status = 5 THEN 1 ELSE 0 END) as no_show_count'),
            ])
            ->groupBy('ea.department_resource_id', DB::raw("TIME_FORMAT(p.start_time, '%H:00')"))
            ->get()
            ->groupBy('department_resource_id');

        $planQuery = DB::table('plan as p')
            ->leftJoin('plan_batch as pb', 'p.batch_id', '=', 'pb.id')
            ->whereDate('pb.plan_date', '>=', $startDate)
            ->whereDate('pb.plan_date', '<=', $endDate)
            ->where('pb.deleted', 0)
            ->where('p.deleted', 0);

        if ($departmentId != null && $departmentId !== '') {
            $planQuery->where('pb.department_id', $departmentId);
        }

        if ($resourceId != null && $resourceId !== '') {
            $resourceIds = is_array($resourceId) ? $resourceId : explode(',', $resourceId);
            $planQuery->whereIn('pb.resource_id', $resourceIds);
        }

        $planStats = $planQuery
            ->select([
                'pb.resource_id',
                DB::raw("TIME_FORMAT(p.start_time, '%H:00') as hour_time"),
                DB::raw('SUM(p.total_quota) as planned_quota'),
            ])
            ->groupBy('pb.resource_id', DB::raw("TIME_FORMAT(p.start_time, '%H:00')"))
            ->get()
            ->groupBy('resource_id');

        $matrix = [];
        foreach ($resources as $resourceIdKey => $resource) {
            $resourceAppointments = $appointmentStats->get($resourceIdKey, collect());
            $resourcePlans = $planStats->get($resourceIdKey, collect());

            $row = [
                'resource_id' => $resourceIdKey,
                'resource_name' => $resource->resource_name,
                'department_id' => $resource->department_id,
                'department_name' => $resource->department_name ?? '',
                'slots' => []
            ];

            foreach ($timeSlots as $slot) {
                $hourKey = substr($slot, 0, 5);
                
                $stat = null;
                foreach ($resourceAppointments as $item) {
                    if ($item->hour_time === $hourKey) {
                        $stat = $item;
                        break;
                    }
                }

                $planned = null;
                foreach ($resourcePlans as $item) {
                    if ($item->hour_time === $hourKey) {
                        $planned = $item;
                        break;
                    }
                }

                $appointmentCount = $stat ? (int)$stat->appointment_count : 0;
                $checkedInCount = $stat ? (int)$stat->checked_in_count : 0;
                $completedCount = $stat ? (int)$stat->completed_count : 0;
                $cancelledCount = $stat ? (int)$stat->cancelled_count : 0;
                $noShowCount = $stat ? (int)$stat->no_show_count : 0;
                $plannedQuota = $planned ? (int)$planned->planned_quota : 0;

                $checkInRate = $appointmentCount > 0 ? round(($checkedInCount / $appointmentCount) * 100, 2) : 0;
                $completionRate = $appointmentCount > 0 ? round(($completedCount / $appointmentCount) * 100, 2) : 0;
                $utilizationRate = $plannedQuota > 0 ? round(($appointmentCount / $plannedQuota) * 100, 2) : 0;

                $row['slots'][] = [
                    'time_period' => $slot,
                    'appointment_count' => $appointmentCount,
                    'checked_in_count' => $checkedInCount,
                    'completed_count' => $completedCount,
                    'cancelled_count' => $cancelledCount,
                    'no_show_count' => $noShowCount,
                    'planned_quota' => $plannedQuota,
                    'check_in_rate' => $checkInRate,
                    'completion_rate' => $completionRate,
                    'utilization_rate' => $utilizationRate,
                ];
            }

            $matrix[] = $row;
        }

        return [
            'success' => true,
            'data' => [
                'resources' => array_values($resources->map(fn($r) => [
                    'id' => $r->id,
                    'name' => $r->resource_name,
                    'department_id' => $r->department_id,
                    'department_name' => $r->department_name ?? ''
                ])->values()->all()),
                'time_slots' => $timeSlots,
                'matrix' => $matrix,
                'date_range' => ['start' => $startDate, 'end' => $endDate]
            ]
        ];
    }

    /**
     * 计算汇总数据
     */
    private function calculateSummaryOld($data)
    {
        if ($data->isEmpty()) {
            return [
                'total_appointments' => 0,
                'total_booked' => 0,
                'total_checked_in' => 0,
                'total_completed' => 0,
                'total_cancelled' => 0,
                'total_no_show' => 0
            ];
        }

        $summary = [
            'total_appointments' => 0,
            'total_booked' => 0,
            'total_checked_in' => 0,
            'total_completed' => 0,
            'total_cancelled' => 0,
            'total_no_show' => 0
        ];

        foreach ($data as $item) {
            $summary['total_appointments'] += $item->total_appointments;
            $summary['total_booked'] += $item->booked_count;
            $summary['total_checked_in'] += $item->checked_in_count;
            $summary['total_completed'] += $item->completed_count;
            $summary['total_cancelled'] += $item->cancelled_count;
            $summary['total_no_show'] += $item->no_show_count;
        }

        $totalBooked = $summary['total_booked'] ?: 1;
        $totalAppointments = $summary['total_appointments'] ?: 1;

        $summary['avg_check_in_rate'] = round(($summary['total_checked_in'] / $totalBooked) * 100, 2);
        $summary['avg_completion_rate'] = round(($summary['total_completed'] / $totalBooked) * 100, 2);
        $summary['avg_cancel_rate'] = round(($summary['total_cancelled'] / $totalAppointments) * 100, 2);
        $summary['avg_no_show_rate'] = round(($summary['total_no_show'] / $totalAppointments) * 100, 2);

        return $summary;
    }
}