<?php

namespace App\Actions\Tickets;

use App\Models\Ticket;
use App\Models\TicketFieldDefinition;
use App\Models\TicketFieldValue;
use App\Models\User;
use Illuminate\Support\Collection;

class SyncProjectTicketFieldValues
{
    /**
     * @param  Collection<int, TicketFieldDefinition>  $fieldDefinitions
     * @param  Collection<int, TicketFieldValue>  $existingFieldValues
     * @param  array<int, array{
     *     ticket_field_definition_id: int,
     *     value_number?: float|int|string|null,
     *     value_user_id?: int|string|null
     * }>  $fieldValueAttributes
     * @return array{
     *     changes: array<int, array<string, mixed>>,
     *     summary_labels: array<int, string>
     * }
     */
    public function handle(
        Ticket $ticket,
        Collection $fieldDefinitions,
        Collection $existingFieldValues,
        array $fieldValueAttributes,
    ): array {
        $changes = [];
        $summaryLabels = [];

        foreach ($fieldValueAttributes as $fieldValueAttribute) {
            $fieldDefinition = $fieldDefinitions->get((int) $fieldValueAttribute['ticket_field_definition_id']);

            if ($fieldDefinition === null) {
                continue;
            }

            $existingFieldValue = $existingFieldValues->get($fieldDefinition->id);

            if ($fieldDefinition->field_type === 'user') {
                $this->syncUserFieldValue(
                    $changes,
                    $existingFieldValue,
                    $fieldDefinition,
                    $fieldValueAttribute,
                    $summaryLabels,
                    $ticket,
                );

                continue;
            }

            $this->syncNumberFieldValue(
                $changes,
                $existingFieldValue,
                $fieldDefinition,
                $fieldValueAttribute,
                $summaryLabels,
                $ticket,
            );
        }

        return [
            'changes' => $changes,
            'summary_labels' => $summaryLabels,
        ];
    }

    /**
     * @param  array<int, array<string, mixed>>  $changes
     * @param  array{value_user_id?: int|string|null}  $fieldValueAttribute
     * @param  array<int, string>  $summaryLabels
     */
    private function syncUserFieldValue(
        array &$changes,
        ?TicketFieldValue $existingFieldValue,
        TicketFieldDefinition $fieldDefinition,
        array $fieldValueAttribute,
        array &$summaryLabels,
        Ticket $ticket,
    ): void {
        $newUserId = $fieldValueAttribute['value_user_id'] ?? null;
        $newUserId = $newUserId === null || $newUserId === '' ? null : (int) $newUserId;

        if ($existingFieldValue?->value_user_id === $newUserId) {
            return;
        }

        $oldUserName = $existingFieldValue?->userValue?->name;
        $newUserName = $newUserId === null ? null : User::query()->find($newUserId)?->name;

        $changes[$fieldDefinition->id] = [
            'field' => $fieldDefinition->label,
            'from' => $oldUserName,
            'to' => $newUserName,
        ];
        $summaryLabels[] = "{$fieldDefinition->label} field";

        if ($newUserId === null) {
            $existingFieldValue?->delete();

            return;
        }

        $ticket->fieldValues()->updateOrCreate(
            [
                'ticket_field_definition_id' => $fieldDefinition->id,
            ],
            [
                'value_number' => null,
                'value_user_id' => $newUserId,
            ],
        );
    }

    /**
     * @param  array<int, array<string, mixed>>  $changes
     * @param  array{value_number?: float|int|string|null}  $fieldValueAttribute
     * @param  array<int, string>  $summaryLabels
     */
    private function syncNumberFieldValue(
        array &$changes,
        ?TicketFieldValue $existingFieldValue,
        TicketFieldDefinition $fieldDefinition,
        array $fieldValueAttribute,
        array &$summaryLabels,
        Ticket $ticket,
    ): void {
        $newNumber = $fieldValueAttribute['value_number'] ?? null;
        $newNumber = $newNumber === null || $newNumber === '' ? null : (float) $newNumber;
        $oldNumber = $existingFieldValue?->value_number;

        if ($oldNumber === $newNumber) {
            return;
        }

        $changes[$fieldDefinition->id] = [
            'field' => $fieldDefinition->label,
            'from' => $this->formatNumber($oldNumber),
            'to' => $this->formatNumber($newNumber),
        ];
        $summaryLabels[] = "{$fieldDefinition->label} field";

        if ($newNumber === null) {
            $existingFieldValue?->delete();

            return;
        }

        $ticket->fieldValues()->updateOrCreate(
            [
                'ticket_field_definition_id' => $fieldDefinition->id,
            ],
            [
                'value_number' => $newNumber,
                'value_user_id' => null,
            ],
        );
    }

    private function formatNumber(?float $value): ?string
    {
        if ($value === null) {
            return null;
        }

        return rtrim(rtrim(number_format($value, 2, '.', ''), '0'), '.');
    }
}