<?php

namespace App\Console\Commands;

use App\Models\ScheduleOverviewLocation;
use App\Models\ScheduleOverviewOwner;
use App\Models\ScheduleOverviewSchedule;
use App\Models\ScheduleOverviewScheduleGroup;
use App\Models\ScheduleOverviewScheduleModule;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;

class MigrateScheduleOverviewLegacySchedules extends Command
{
    protected $signature = 'schedule-overview:migrate-legacy-schedules {--year=} {--dry-run}';

    protected $description = '将旧的 schedule_overview_schedules 数据迁移到 schedule_groups + modules（不删除旧数据）';

    public function handle(): int
    {
        $year = $this->option('year');
        $dryRun = (bool) $this->option('dry-run');

        $query = ScheduleOverviewSchedule::query()->orderBy('id');
        if (!empty($year)) {
            $query->where('year', (string) $year);
        }

        $legacyList = $query->get();
        if ($legacyList->isEmpty()) {
            $this->info('未找到需要迁移的数据。');
            return self::SUCCESS;
        }

        $this->info('待迁移条数：' . $legacyList->count() . ($dryRun ? '（dry-run）' : ''));

        $createdGroups = 0;
        $createdModules = 0;
        $skippedModules = 0;

        DB::beginTransaction();
        try {
            foreach ($legacyList as $legacy) {
                $group = ScheduleOverviewScheduleGroup::query()
                    ->where('year', $legacy->year)
                    ->where('system_id', $legacy->system_id)
                    ->where('course_id', $legacy->course_id)
                    ->where('title', $legacy->title)
                    ->first();

                if (empty($group)) {
                    $group = new ScheduleOverviewScheduleGroup();
                    $group->year = (string) $legacy->year;
                    $group->system_id = (int) $legacy->system_id;
                    $group->course_id = (int) $legacy->course_id;
                    $group->title = (string) $legacy->title;
                    $group->admin_id = $legacy->admin_id;
                    $group->department_id = $legacy->department_id;

                    if (!$dryRun) {
                        $group->save();
                    }
                    $createdGroups++;
                }

                $locationName = trim((string) ($legacy->location ?? ''));
                $ownerName = trim((string) ($legacy->owner ?? ''));

                if ($locationName === '' || $ownerName === '') {
                    // 旧数据不完整时跳过，避免写入无法编辑的 module
                    $this->warn("跳过 legacy#{$legacy->id}：地点或负责人为空");
                    continue;
                }

                $location = ScheduleOverviewLocation::query()->where('name', $locationName)->first();
                if (empty($location)) {
                    $location = new ScheduleOverviewLocation();
                    $location->name = $locationName;
                    $location->sort = 0;
                    $location->status = 1;
                    $location->admin_id = $legacy->admin_id;
                    $location->department_id = $legacy->department_id;
                    if (!$dryRun) {
                        $location->save();
                    }
                }

                $owner = ScheduleOverviewOwner::query()->where('name', $ownerName)->first();
                if (empty($owner)) {
                    $owner = new ScheduleOverviewOwner();
                    $owner->name = $ownerName;
                    $owner->sort = 0;
                    $owner->status = 1;
                    $owner->admin_id = $legacy->admin_id;
                    $owner->department_id = $legacy->department_id;
                    if (!$dryRun) {
                        $owner->save();
                    }
                }

                $exists = ScheduleOverviewScheduleModule::query()
                    ->where('group_id', $group->id)
                    ->where('month', (int) $legacy->month)
                    ->where('location_id', $location->id)
                    ->where('owner_id', $owner->id)
                    ->where('count_text', (string) ($legacy->count_text ?? ''))
                    ->exists();

                if ($exists) {
                    $skippedModules++;
                    continue;
                }

                $module = new ScheduleOverviewScheduleModule();
                $module->group_id = $group->id;
                $module->name = null;
                $module->month = (int) $legacy->month;
                $module->location_id = $location->id;
                $module->owner_id = $owner->id;
                $module->count_text = (string) ($legacy->count_text ?? '');
                $module->sort = 0;
                $module->admin_id = $legacy->admin_id;
                $module->department_id = $legacy->department_id;

                if (!$dryRun) {
                    $module->save();
                }
                $createdModules++;
            }

            if ($dryRun) {
                DB::rollBack();
            } else {
                DB::commit();
            }
        } catch (\Throwable $throwable) {
            DB::rollBack();
            $this->error($throwable->getMessage());
            return self::FAILURE;
        }

        $this->info("迁移完成：新增 groups={$createdGroups}，新增 modules={$createdModules}，跳过重复 modules={$skippedModules}");
        if ($dryRun) {
            $this->info('dry-run 未写入数据库。');
        }

        return self::SUCCESS;
    }
}