<?php

declare(strict_types=1);

/**
 * SPDX-FileCopyrightText: Sebastian Krupinski <krupinski01@gmail.com>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace KTXM\ProviderImap\Providers;

use DateTimeImmutable;
use DateTimeInterface;
use KTXM\ProviderImap\Client\Message;
use KTXM\ProviderImap\Client\MessagePart as ClientMessagePart;
use KTXF\Mail\Object\MessagePropertiesMutableAbstract;

/**
 * Mail Message Properties Implementation
 */
class MessageProperties extends MessagePropertiesMutableAbstract {

    /**
     * Convert IMAP data to mail message properties object.
     */
    public function fromImap(Message $message): static
    {
        $this->data[static::PROPERTY_SIZE] = $message->size();

        if ($message->messageId() !== null) {
            $this->data[static::PROPERTY_URID] = $message->messageId();
        }

        if ($message->inReplyTo() !== null) {
            $this->data[static::PROPERTY_IN_REPLY_TO] = $message->inReplyTo();
        }

        //if ($message->references() !== []) {
        //    $this->data[static::PROPERTY_REFERENCES] = $message->references();
        //}

        $receivedAt = $message->receivedAt() ?? $message->internalDate();
        if ($receivedAt !== null) {
            $date = new DateTimeImmutable($receivedAt);
            $this->data[static::PROPERTY_RECEIVED] = $date->format(DateTimeInterface::ATOM);
        }

        if ($message->sentAt() !== null) {
            $date = new DateTimeImmutable($message->sentAt());
            $this->data[static::PROPERTY_SENT] = $date->format(DateTimeInterface::ATOM);
        }

        if ($message->sender() !== []) {
            $this->data[static::PROPERTY_SENDER] = $message->sender()[0]->toArray();
        }

        if ($message->from() !== []) {
            $this->data[static::PROPERTY_FROM] = $message->from()[0]->toArray();
        }

        $addressProperties = [
            'to' => static::PROPERTY_TO,
            'cc' => static::PROPERTY_CC,
            'bcc' => static::PROPERTY_BCC,
            'replyTo' => static::PROPERTY_REPLY_TO,
        ];

        foreach ($addressProperties as $field => $property) {
            $addresses = $message->{$field}();
            if ($addresses === []) {
                continue;
            }

            $this->data[$property] = array_map(
                static fn ($address): array => $address->toArray(),
                $addresses,
            );
        }

        if ($message->subject() !== null) {
            $this->data[static::PROPERTY_SUBJECT] = $message->subject();
        }

        if ($message->bodyStructure() !== null) {
            $body = $message->bodyStructure()->withInjectedSections($message->bodySections() ?? [])->toArray();
            $this->data[static::PROPERTY_BODY] = $body;

            $attachments = [];
            $this->collectAttachments($body, $attachments);
            if ($attachments !== []) {
                $this->data[static::PROPERTY_ATTACHMENTS] = $attachments;
            }
        }

        $this->data[static::PROPERTY_FLAGS] = [];
        foreach ($message->flags() as $flag) {
            $flag = ltrim($flag, '\\');
            $normalized = match (strtolower($flag)) {
                'seen' => 'seen',
                'flagged' => 'flagged',
                'answered' => 'answered',
                'draft' => 'draft',
                'deleted' => 'deleted',
                default => strtolower($flag),
            };
            $this->data[static::PROPERTY_FLAGS][$normalized] = true;
        }

        return $this;
    }

    /**
     * Recursively collect attachment parts from body structure
     */
    private function collectAttachments(array $part, array &$attachments): void
    {
        $children = $part['subParts'] ?? [];
        if ($children !== []) {
            foreach ($children as $childPart) {
                $this->collectAttachments($childPart, $attachments);
            }
            return;
        }

        $mimeType = strtolower((string)($part['type'] ?? ''));
        $disposition = strtolower((string)($part['disposition'] ?? ''));
        $name = $part['name'] ?? null;
        $isInlineText = str_starts_with($mimeType, 'text/')
            && in_array($mimeType, ['text/plain', 'text/html'], true)
            && $disposition !== 'attachment';

        if ($isInlineText || ($disposition === '' && $name === null)) {
            return;
        }

        $attachments[] = $part;
    }

}