<?php

namespace Tests\Fakes;

use App\Schedule\AssignmentForDate;
use App\Schedule\CreateScheduleDto;
use App\Schedule\RescheduleScheduleDto;
use App\Schedule\Schedule;
use App\Schedule\ScheduleAssignment;
use App\Schedule\ScheduleRepository;
use App\User\User;
use DateTimeImmutable;
use DomainException;

class FakeScheduleRepository implements ScheduleRepository
{
    /**
     * @var array<int, Schedule>
     */
    private array $schedules = [];

    private int $nextAssignmentId = 1;

    public function create(CreateScheduleDto $dto): Schedule
    {
        $id = count($this->schedules) + 1;
        $assignments = [];

        foreach ($dto->assignments as $assignmentDto) {
            $assignments[] = new ScheduleAssignment(
                id: $this->nextAssignmentId++,
                name: $assignmentDto->name,
                kind: $assignmentDto->kind,
                path: $assignmentDto->path,
                scheduledDate: $assignmentDto->scheduledDate,
                position: $assignmentDto->position,
                completedAt: null,
            );
        }

        $schedule = new Schedule(
            id: $id,
            user: $dto->user,
            setName: $dto->setName,
            elementKind: $dto->elementKind,
            startDate: $dto->startDate,
            targetDate: $dto->targetDate,
            assignments: $assignments,
        );
        $this->schedules[$id] = $schedule;

        return $this->copy($schedule);
    }

    public function reschedule(RescheduleScheduleDto $dto): Schedule
    {
        $schedule = $this->schedules[$dto->scheduleId] ?? null;
        if ($schedule === null || $schedule->getUser()->getId()
            !== $dto->user->getId()
        ) {
            throw new DomainException(
                "Schedule with id {$dto->scheduleId} not found",
            );
        }

        $datesByAssignmentId = [];
        foreach ($dto->assignments as $assignmentDto) {
            $datesByAssignmentId[$assignmentDto->id] =
                $assignmentDto->scheduledDate;
        }
        $assignments = [];
        foreach ($schedule->getAssignments() as $assignment) {
            $assignments[] = new ScheduleAssignment(
                id: $assignment->getId(),
                name: $assignment->getName(),
                kind: $assignment->getKind(),
                path: $assignment->getPath(),
                scheduledDate: $datesByAssignmentId[$assignment->getId()]
                    ?? $assignment->getScheduledDate(),
                position: $assignment->getPosition(),
                completedAt: $assignment->getCompletedAt(),
            );
        }

        $rescheduled = new Schedule(
            id: $schedule->getId(),
            user: $schedule->getUser(),
            setName: $schedule->getSetName(),
            elementKind: $schedule->getElementKind(),
            startDate: $dto->startDate,
            targetDate: $dto->targetDate,
            assignments: $assignments,
        );
        $this->schedules[$dto->scheduleId] = $rescheduled;

        return $this->copy($rescheduled);
    }

    public function findForUser(int $id, User $user): ?Schedule
    {
        $schedule = $this->schedules[$id] ?? null;
        if ($schedule === null || $schedule->getUser()->getId()
            !== $user->getId()
        ) {
            return null;
        }

        return $this->copy($schedule);
    }

    public function findAllForUser(User $user): array
    {
        $schedules = array_filter(
            $this->schedules,
            function (Schedule $schedule) use ($user): bool {
                return $schedule->getUser()->getId() === $user->getId();
            },
        );
        krsort($schedules);

        return array_map(function (Schedule $schedule): Schedule {
            return $this->copy($schedule);
        }, array_values($schedules));
    }

    public function findIncompleteAssignmentsForUserDueOnOrBefore(
        User $user,
        DateTimeImmutable $date,
    ): array {
        $assignments = [];

        foreach ($this->findAllForUser($user) as $schedule) {
            foreach ($schedule->getAssignments() as $assignment) {
                if ($assignment->getScheduledDate() > $date
                    || $assignment->getCompletedAt() !== null
                ) {
                    continue;
                }

                $assignments[] = new AssignmentForDate(
                    scheduleId: $schedule->getId(),
                    setName: $schedule->getSetName(),
                    assignment: $assignment,
                );
            }
        }

        usort(
            $assignments,
            function (
                AssignmentForDate $first,
                AssignmentForDate $second,
            ): int {
                $firstAssignment = $first->getAssignment();
                $secondAssignment = $second->getAssignment();
                $dateComparison = $firstAssignment->getScheduledDate()
                    <=> $secondAssignment->getScheduledDate();
                if ($dateComparison !== 0) {
                    return $dateComparison;
                }

                $scheduleComparison = $second->getScheduleId()
                    <=> $first->getScheduleId();
                if ($scheduleComparison !== 0) {
                    return $scheduleComparison;
                }

                $positionComparison = $firstAssignment->getPosition()
                    <=> $secondAssignment->getPosition();
                if ($positionComparison !== 0) {
                    return $positionComparison;
                }

                return $firstAssignment->getId()
                    <=> $secondAssignment->getId();
            },
        );

        return $assignments;
    }

    public function findAssignmentForUser(
        int $id,
        User $user,
    ): ?ScheduleAssignment {
        foreach ($this->findAllForUser($user) as $schedule) {
            foreach ($schedule->getAssignments() as $assignment) {
                if ($assignment->getId() === $id) {
                    return $this->copyAssignment($assignment);
                }
            }
        }

        return null;
    }

    public function updateAssignment(
        ScheduleAssignment $assignment,
    ): ScheduleAssignment {
        foreach ($this->schedules as $id => $schedule) {
            $assignments = [];
            $found = false;

            foreach ($schedule->getAssignments() as $storedAssignment) {
                if ($storedAssignment->getId() === $assignment->getId()) {
                    $assignments[] = $this->copyAssignment($assignment);
                    $found = true;
                } else {
                    $assignments[] = $this->copyAssignment(
                        $storedAssignment,
                    );
                }
            }

            if ($found) {
                $this->schedules[$id] = new Schedule(
                    id: $schedule->getId(),
                    user: $schedule->getUser(),
                    setName: $schedule->getSetName(),
                    elementKind: $schedule->getElementKind(),
                    startDate: $schedule->getStartDate(),
                    targetDate: $schedule->getTargetDate(),
                    assignments: $assignments,
                );

                return $this->copyAssignment($assignment);
            }
        }

        throw new DomainException(
            "Assignment with id {$assignment->getId()} not found",
        );
    }

    private function copy(Schedule $schedule): Schedule
    {
        $assignments = array_map(function (
            ScheduleAssignment $assignment,
        ): ScheduleAssignment {
            return $this->copyAssignment($assignment);
        }, $schedule->getAssignments());

        return new Schedule(
            id: $schedule->getId(),
            user: $schedule->getUser(),
            setName: $schedule->getSetName(),
            elementKind: $schedule->getElementKind(),
            startDate: $schedule->getStartDate(),
            targetDate: $schedule->getTargetDate(),
            assignments: $assignments,
        );
    }

    private function copyAssignment(
        ScheduleAssignment $assignment,
    ): ScheduleAssignment {
        return new ScheduleAssignment(
            id: $assignment->getId(),
            name: $assignment->getName(),
            kind: $assignment->getKind(),
            path: $assignment->getPath(),
            scheduledDate: $assignment->getScheduledDate(),
            position: $assignment->getPosition(),
            completedAt: $assignment->getCompletedAt(),
        );
    }
}