<?php

namespace App\Console\Commands;

use App\Models\Course;
use App\Models\CourseSign;
use App\Models\User;
use App\Services\SchoolmateEnrollmentService;
use Illuminate\Console\Command;

class BackfillSchoolmate extends Command
{
    protected $signature = 'schoolmate:backfill
        {course_ids : 课程ID，多个用英文逗号分隔}
        {--execute : 正式补齐；不传时只检查并输出遗漏名单}';

    protected $description = '按指定课程检查或补齐审核通过学员的校友资格';

    public function handle(SchoolmateEnrollmentService $service)
    {
        $raw = (string) $this->argument('course_ids');
        if (!preg_match('/^[1-9][0-9]*(,[1-9][0-9]*)*$/D', $raw)) {
            $this->error('课程ID必须为正整数，多个用英文逗号分隔。');
            return 1;
        }
        $ids = array_values(array_unique(explode(',', $raw)));
        $courses = Course::whereIn('id', $ids);
        $found = (clone $courses)->get(['id', 'name', 'start_date']);
        $missingIds = array_diff($ids, $found->pluck('id')->all());
        if ($missingIds) {
            $this->error('课程不存在或已删除：' . implode(',', $missingIds));
            return 1;
        }
        // 缺少开课日期时无法确定历史入库时间，整批停止，避免只补一部分。
        foreach ($found as $course) {
            if (!$course->start_date) {
                $this->error("课程 {$course->id}【{$course->name}】缺少开课日期，请先补全。");
                return 1;
            }
        }
        $this->table(['课程ID', '课程名称', '开课日期'], $found->map(function ($course) {
            return [$course->id, $course->name, $course->start_date];
        })->all());
        $execute = (bool) $this->option('execute');
        $this->info($execute ? '正式执行：仅补齐尚非校友的审核通过学员。' : '检查模式：不会修改任何学员数据。');
        $total = 0;
        $updated = 0;
        $service->pendingUsers($courses)->chunkById(200, function ($users) use ($service, $execute, $ids, &$total, &$updated) {
            $rows = [];
            $courseInfo = $this->approvedCourseInfo($users->pluck('id')->all(), $ids);
            foreach ($users as $user) {
                $total++;
                $rows[] = [$user->id, $user->name, $user->mobile, $courseInfo[$user->id] ?? '', $user->source_start_date];
                if ($execute) {
                    $updated += $service->promote($user->id, $user->source_start_date);
                }
            }
            $this->table(['学员ID', '姓名', '手机号', '所选课程中审核通过的课程（ID／名称／开课日期）', '拟入库日期（所选课程最早开课日）'], $rows);
        }, 'users.id', 'id');
        $this->info("发现遗漏 {$total} 人" . ($execute ? "，实际补齐 {$updated} 人。" : '；正式补齐请追加 --execute。'));
        $this->info('反向核对：当前是校友，但所选课程中没有未删除的审核通过记录。');
        $this->line('此名单仅供核对，可能通过其他课程成为校友，不会取消校友资格。');
        $outsideTotal = 0;
        User::where('is_schoolmate', 1)
            ->whereDoesntHave('courseSigns', function ($query) use ($ids) {
                $query->whereIn('course_id', $ids)->where('status', 1);
            })
            ->chunkById(200, function ($users) use ($ids, &$outsideTotal) {
                $selectedInfo = $this->selectedEnrollmentInfo($users->pluck('id')->all(), $ids);
                $courseInfo = $this->approvedCourseInfo($users->pluck('id')->all());
                $rows = [];
                foreach ($users as $user) {
                    $outsideTotal++;
                    $rows[] = [$user->id, $user->name, $user->mobile, $user->schoolmate_time,
                        $selectedInfo[$user->id] ?? '无有效报名记录',
                        $courseInfo[$user->id] ?? '无有效审核通过课程记录'];
                }
                $this->table(['学员ID', '姓名', '手机号', '入库时间', '所选课程报名情况（ID／名称／状态）', '其他审核通过课程（仅供核对，非入库来源证明）'], $rows);
            });
        $this->info("所选课程无审核通过记录的校友共 {$outsideTotal} 人。");
        return 0;
    }

    private function selectedEnrollmentInfo(array $userIds, array $courseIds): array
    {
        return CourseSign::query()
            ->join('courses', 'courses.id', '=', 'course_signs.course_id')
            ->whereNull('courses.deleted_at')
            ->whereIn('course_signs.user_id', $userIds)
            ->whereIn('course_signs.course_id', $courseIds)
            ->orderBy('courses.id')->orderBy('course_signs.id')
            ->get(['course_signs.user_id', 'course_signs.status', 'courses.id as course_id', 'courses.name'])
            ->groupBy('user_id')->map(function ($signs) {
                return $signs->map(function ($sign) {
                    $status = CourseSign::$intToString['status'][$sign->status] ?? ('未知状态：' . $sign->status);
                    return "{$sign->course_id}／{$sign->name}／{$status}";
                })->unique()->implode("\n");
            })->all();
    }

    private function approvedCourseInfo(array $userIds, ?array $courseIds = null): array
    {
        $query = CourseSign::query()
            ->join('courses', 'courses.id', '=', 'course_signs.course_id')
            ->whereNull('courses.deleted_at')
            ->whereIn('course_signs.user_id', $userIds)
            ->where('course_signs.status', 1);
        if ($courseIds !== null) {
            $query->whereIn('course_signs.course_id', $courseIds);
        }

        return $query->orderBy('courses.start_date')->orderBy('courses.id')
            ->get(['course_signs.user_id', 'courses.id as course_id', 'courses.name', 'courses.start_date'])
            ->groupBy('user_id')->map(function ($signs) {
                return $signs->unique('course_id')->map(function ($sign) {
                    return "{$sign->course_id}／{$sign->name}／{$sign->start_date}";
                })->implode("\n");
            })->all();
    }
}