<?php

namespace App\Schedule;

use App\User\User;
use DateTimeImmutable;
use DateTimeZone;
use DomainException;
use Illuminate\Support\Facades\DB;

class EloquentScheduleRepository implements ScheduleRepository
{
    public function create(CreateScheduleDto $dto): Schedule
    {
        return DB::transaction(function () use ($dto): Schedule {
            $model = ScheduleModel::create([
                'user_id' => $dto->user->getId(),
                'set_name' => $dto->setName,
                'element_kind' => $dto->elementKind,
                'start_date' => $dto->startDate->format('Y-m-d'),
                'target_date' => $dto->targetDate->format('Y-m-d'),
            ]);

            foreach ($dto->assignments as $assignmentDto) {
                ScheduleAssignmentModel::create([
                    'schedule_id' => $model->id,
                    'element_name' => $assignmentDto->name,
                    'element_kind' => $assignmentDto->kind,
                    'element_path' => $assignmentDto->path,
                    'scheduled_date' => $assignmentDto->scheduledDate
                        ->format('Y-m-d'),
                    'position' => $assignmentDto->position,
                    'completed_at' => null,
                ]);
            }

            return $this->toDomain($model, $dto->user);
        });
    }

    public function findForUser(int $id, User $user): ?Schedule
    {
        $model = ScheduleModel::query()
            ->where('id', $id)
            ->where('user_id', $user->getId())
            ->first();

        return $model === null ? null : $this->toDomain($model, $user);
    }

    public function findAllForUser(User $user): array
    {
        $models = ScheduleModel::query()
            ->where('user_id', $user->getId())
            ->orderByDesc('id')
            ->get();
        $schedules = [];

        foreach ($models as $model) {
            $schedules[] = $this->toDomain($model, $user);
        }

        return $schedules;
    }

    public function findIncompleteAssignmentsForUserDueOnOrBefore(
        User $user,
        DateTimeImmutable $date,
    ): array {
        $assignmentModels = ScheduleAssignmentModel::query()
            ->select('schedule_assignments.*')
            ->join(
                'schedules',
                'schedules.id',
                '=',
                'schedule_assignments.schedule_id',
            )
            ->where('schedules.user_id', $user->getId())
            ->where(
                'schedule_assignments.scheduled_date',
                '<=',
                $date->format('Y-m-d'),
            )
            ->whereNull('schedule_assignments.completed_at')
            ->with('schedule')
            ->orderBy('schedule_assignments.scheduled_date')
            ->orderByDesc('schedules.id')
            ->orderBy('schedule_assignments.position')
            ->orderBy('schedule_assignments.id')
            ->get();
        $assignments = [];

        foreach ($assignmentModels as $assignmentModel) {
            $assignments[] = new AssignmentForDate(
                scheduleId: $assignmentModel->schedule->id,
                setName: $assignmentModel->schedule->set_name,
                assignment: $this->assignmentToDomain($assignmentModel),
            );
        }

        return $assignments;
    }

    public function findAssignmentForUser(
        int $id,
        User $user,
    ): ?ScheduleAssignment {
        $model = ScheduleAssignmentModel::query()
            ->select('schedule_assignments.*')
            ->join(
                'schedules',
                'schedules.id',
                '=',
                'schedule_assignments.schedule_id',
            )
            ->where('schedule_assignments.id', $id)
            ->where('schedules.user_id', $user->getId())
            ->first();

        return $model === null
            ? null
            : $this->assignmentToDomain($model);
    }

    public function updateAssignment(
        ScheduleAssignment $assignment,
    ): ScheduleAssignment {
        $model = ScheduleAssignmentModel::find($assignment->getId());
        if ($model === null) {
            throw new DomainException(
                "Assignment with id {$assignment->getId()} not found",
            );
        }

        $model->completed_at = $assignment->getCompletedAt();
        $model->save();

        return $this->assignmentToDomain($model);
    }

    private function toDomain(ScheduleModel $model, User $user): Schedule
    {
        $assignmentModels = ScheduleAssignmentModel::query()
            ->where('schedule_id', $model->id)
            ->orderBy('position')
            ->orderBy('id')
            ->get();
        $assignments = [];

        foreach ($assignmentModels as $assignmentModel) {
            $assignments[] = $this->assignmentToDomain($assignmentModel);
        }

        return new Schedule(
            id: $model->id,
            user: $user,
            setName: $model->set_name,
            elementKind: $model->element_kind,
            startDate: $this->date($model->start_date),
            targetDate: $this->date($model->target_date),
            assignments: $assignments,
        );
    }

    private function assignmentToDomain(
        ScheduleAssignmentModel $model,
    ): ScheduleAssignment {
        return new ScheduleAssignment(
            id: $model->id,
            name: $model->element_name,
            kind: $model->element_kind,
            path: $model->element_path,
            scheduledDate: $this->date($model->scheduled_date),
            position: $model->position,
            completedAt: $model->completed_at === null
                ? null
                : $this->dateTime($model->completed_at),
        );
    }

    private function date(string $value): DateTimeImmutable
    {
        return new DateTimeImmutable($value, new DateTimeZone('UTC'));
    }

    private function dateTime(DateTimeImmutable $value): DateTimeImmutable
    {
        return DateTimeImmutable::createFromInterface($value)
            ->setTimezone(new DateTimeZone('UTC'));
    }
}