<?php

namespace app\command;

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Helper\Table;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use support\Db;

/**
 * 拉取邮箱的详情入库（根据emai_uid）
 */
class EmailDetailCommand extends Command
{
    protected static $defaultName = 'email-detail';
    protected static $defaultDescription = '拉取 detail 入库';

    protected function configure()
    {
        $this->addOption(
            'per-page', 'p',
            InputOption::VALUE_OPTIONAL,
            '每批处理多少条详情',
            config('imap.per_page', 50)
        );
    }

    protected function execute(InputInterface $input, OutputInterface $output): int
    {
        try {
            $cfg      = config('imap');
            $mailbox  = $cfg['mailbox'];
            $username = $cfg['username'];
            $password = $cfg['password'];
            $batch    = (int)$input->getOption('per-page');

            // 打开 IMAP
            $inbox = @imap_open($mailbox, $username, $password);
            if (!$inbox) {
                $output->writeln("<error>IMAP 连接失败：". imap_last_error() ."</error>");
                return Command::FAILURE;
            }

            // 阶段二：逐批拉取详情并写入 emails 表
            $output->writeln("依次拉取详情并写入 emails 表 …");
            while (true) {
                $pending = Db::table('email_uids')
                    ->where('status', 0)
                    // ->where('uid', '>', 13399)
                    ->orderBy('uid', 'desc')
                    ->limit(2)
                    ->get();

                if (count($pending) === 0) {
                    $output->writeln("<info>所有 UID 均已处理完毕。</info>");
                    break;
                }

                $output->writeln("处理下一批 " . count($pending) . " 条 …");

                foreach ($pending as $row) {
                    $uid = $row->uid;

                    // 包裹整行处理在 try/catch 中，任何异常都不会中断循环
                    try {
                        $output->writeln("---- 开始处理 UID={$uid} ----");

                        // 1. fetch overview
                        $ov = @imap_fetch_overview($inbox, $uid, FT_UID)[0] ?? null;
                        if (!$ov) {
                            $err = imap_last_error() ?: '未知错误';
                            $output->writeln("<error>UID={$uid} overview 失败：{$err}</error>");
                            $this->logError("UID={$uid} overview 失败：{$err}");
                            continue;
                        }
                        $subject = mb_convert_encoding($ov->subject ?? '', 'UTF-8', 'GBK,UTF-8');
                        $from    = $ov->from    ?? '';
                        $date    = $ov->date    ?? '';

                        $output->writeln("UID={$uid} overview 成功，subject={$subject}");

                        // 2. fetch body
                        $body = $this->getMailBody($inbox, $uid, true);
                        $output->writeln("UID={$uid} body 长度：" . strlen($body));

                        // 3. sanitize & insert
                        $body     = $this->sanitizeUtf8($body);
                        $now      = time();

                        try {
                            Db::table('emails')->insert([
                                'uid'        => $uid,
                                'subject'    => $subject,
                                'from'       => $from,
                                'date'       => $date,
                                'body'       => $body,
                                'created_at' => $now,
                                'updated_at' => $now,
                            ]);
                            $output->writeln("<info>UID={$uid} 写入 emails 成功</info>");
                        } catch (\Throwable $e) {
                            $output->writeln("<error>UID={$uid} 写入失败：{$e->getMessage()}</error>");
                            $this->logError("UID={$uid} 写入失败：{$e->getMessage()}");
                            continue;
                        }

                        // 4. 标记已处理
                        try {
                            Db::table('email_uids')
                                ->where('uid', $uid)
                                ->update([
                                    'status'       => 1,
                                    'processed_at' => $now,
                                ]);
                            $output->writeln("<info>UID={$uid} 标记为已处理</info>");
                        } catch (\Throwable $e) {
                            $output->writeln("<error>UID={$uid} 标记状态失败：{$e->getMessage()}</error>");
                            $this->logError("UID={$uid} 标记状态失败：{$e->getMessage()}");
                            // 即使更新 status 失败，也继续下一条
                        }
                    } catch (\Throwable $e) {
                        // 捕获任何非预期错误
                        $output->writeln("<error>UID={$uid} 处理异常：{$e->getMessage()}</error>");
                        $this->logError("UID={$uid} 处理异常：{$e->getMessage()}");
                        continue;
                    }
                }

                // 批次结束后稍作休眠，防止服务器过载
                sleep(1);
            }

            imap_close($inbox);
            $output->writeln("\n<info>✅ 全部邮件处理完成。</info>");
            return Command::SUCCESS;
        } catch (\Throwable $th) {
            dpr($th);
            return Command::FAILURE;
        }
    }

    /**
     * 将任意字符串清洗为有效 UTF-8，移除或替换无效字节
     */
    protected function sanitizeUtf8(string $text): string
    {
        return iconv('UTF-8', 'UTF-8//IGNORE', $text);
    }

    /**
     * 记录错误到日志
     */
    protected function logError(string $msg): void
    {
        $line = '[' . date('Y-m-d H:i:s') . '] ' . $msg . "\n";
        file_put_contents(
            runtime_path('logs/email_errors.log'),
            $line,
            FILE_APPEND | LOCK_EX
        );
    }

    /**
     * 按编码解码并保留 "\r\n"
     */
    protected function getMailBody($inbox, int $id, bool $isUid = false): string
    {
        $flags     = $isUid ? FT_UID : 0;
        $structure = imap_fetchstructure($inbox, $id, $flags);

        if (!empty($structure->parts)) {
            // HTML 部分
            foreach ($structure->parts as $i => $part) {
                if (isset($part->subtype) && strtolower($part->subtype) === 'html') {
                    $data = imap_fetchbody($inbox, $id, (string)($i+1), $flags);
                    return $this->decodeBody($data, $part->encoding);
                }
            }
            // 文本部分
            foreach ($structure->parts as $i => $part) {
                if (isset($part->subtype) && strtolower($part->subtype) === 'plain') {
                    $data = imap_fetchbody($inbox, $id, (string)($i+1), $flags);
                    return $this->decodeBody($data, $part->encoding);
                }
            }
            // 原始 body
            return imap_body($inbox, $id, $flags);
        }

        return imap_body($inbox, $id, $flags);
    }

    /**
     * 按编码解码
     */
    protected function decodeBody(string $body, int $encoding): string
    {
        switch ($encoding) {
            case 3: return imap_base64($body);
            case 4: return imap_qprint($body);
            default: return $body;
        }
    }
}