<?php

namespace app\common\tools;

use app\model\Post;
use app\model\PostOutput;
use app\model\PostOutputFile;
use think\facade\App;

class PhoneImage implements PostOutputManagerInterface
{
    /**
     * 返回配置字段定义
     */
    public function getConfigFields(): array
    {
        return [
            'size' => ['type' => 'select', 'options' => ['xiaohongshu', 'douyin'], 'default' => 'xiaohongshu'],
            'fontSize' => ['type' => 'number', 'default' => 14, 'min' => 10, 'max' => 24],
            'watermark' => ['type' => 'text', 'default' => ''],
            'pageAlignments' => ['type' => 'json', 'default' => '{}'],
        ];
    }

    /**
     * 验证配置合法性
     */
    public function validateConfig(array $config): bool
    {
        $fields = $this->getConfigFields();

        if (isset($config['size']) && !in_array($config['size'], $fields['size']['options'])) {
            return false;
        }
        if (isset($config['fontSize'])) {
            $size = intval($config['fontSize']);
            if ($size < $fields['fontSize']['min'] || $size > $fields['fontSize']['max']) {
                return false;
            }
        }
        // watermark 是文本类型，无需特殊验证
        // pageAlignments 是 JSON 类型，存储时由框架自动序列化

        return true;
    }

    /**
     * 执行输出处理 - 服务端接收base64数据，保存文件，创建记录
     * 注意：HTML渲染在前端完成(html2canvas)，服务端只做文件保存和记录创建
     */
    public function process(Post $post, array $config): array
    {
        return [];
    }

    /**
     * 返回预览HTML - 预览在前端完成，服务端返回空
     */
    public function getPreview(Post $post, array $config): string
    {
        return '';
    }

    /**
     * 保存单页图片
     * @param int $outputId 输出记录ID
     * @param int $page 页码(从1开始)
     * @param string $imageData base64编码的图片数据
     * @return PostOutputFile|false
     */
    public function savePageImage(int $outputId, int $page, string $imageData)
    {
        // 保留原始base64用于存储
        $rawBase64 = str_replace('data:image/jpeg;base64,', '', $imageData);
        $rawBase64 = str_replace('data:image/png;base64,', '', $rawBase64);
        $rawBase64 = str_replace(' ', '+', $rawBase64);
        $decoded = base64_decode($rawBase64);

        if ($decoded === false) {
            return false;
        }

        $imageInfo = @getimagesizefromstring($decoded);
        $width = is_array($imageInfo) ? $imageInfo[0] : 0;
        $height = is_array($imageInfo) ? $imageInfo[1] : 0;

        $fileRecord = PostOutputFile::create([
            'output_id' => $outputId,
            'page' => $page,
            'file_path' => '',
            'file_url' => '',
            'file_size' => strlen($decoded),
            'width' => $width,
            'height' => $height,
            'image_data' => $rawBase64,
        ]);

        return $fileRecord;
    }

    /**
     * 保存长图
     * @param int $outputId 输出记录ID
     * @param string $imageData base64编码的长图数据
     * @return PostOutputFile|false
     */
    public function saveLongImage(int $outputId, string $imageData)
    {
        $rawBase64 = str_replace('data:image/jpeg;base64,', '', $imageData);
        $rawBase64 = str_replace('data:image/png;base64,', '', $rawBase64);
        $rawBase64 = str_replace(' ', '+', $rawBase64);
        $decoded = base64_decode($rawBase64);

        if ($decoded === false) {
            return false;
        }

        $imageInfo = @getimagesizefromstring($decoded);
        $width = is_array($imageInfo) ? $imageInfo[0] : 0;
        $height = is_array($imageInfo) ? $imageInfo[1] : 0;

        // 先删除该output_id下已有的长图(page=0)
        PostOutputFile::where('output_id', $outputId)
            ->where('page', 0)
            ->delete();

        $fileRecord = PostOutputFile::create([
            'output_id' => $outputId,
            'page' => 0,
            'file_path' => '',
            'file_url' => '',
            'file_size' => strlen($decoded),
            'width' => $width,
            'height' => $height,
            'image_data' => $rawBase64,
        ]);

        return $fileRecord;
    }

    /**
     * 打包某条输出记录的所有图片为ZIP
     * @param int $outputId
     * @return string ZIP文件路径
     * @throws \Exception
     */
    public function createZip(int $outputId): string
    {
        $output = PostOutput::find($outputId);
        if (!$output) {
            throw new \Exception('输出记录不存在');
        }

        $files = PostOutputFile::where('output_id', $outputId)
            ->order('page', 'asc')
            ->select();

        if ($files->isEmpty()) {
            throw new \Exception('没有可下载的文件');
        }

        $tempDir = App::getRuntimePath() . 'temp';
        if (!is_dir($tempDir)) {
            mkdir($tempDir, 0777, true);
        }

        $zipFileName = 'post_output_' . $outputId . '.zip';
        $zipPath = $tempDir . '/' . $zipFileName;
        $tempFiles = [];

        try {
            $zip = new \ZipArchive();
            if ($zip->open($zipPath, \ZipArchive::CREATE | \ZipArchive::OVERWRITE) !== true) {
                throw new \Exception('无法创建ZIP文件');
            }

            foreach ($files as $file) {
                $pageName = str_pad((string) $file->page, 2, '0', STR_PAD_LEFT) . '.jpg';

                if (!empty($file->image_data)) {
                    $decoded = base64_decode($file->image_data);
                    if ($decoded !== false) {
                        $tempFilePath = $tempDir . '/page_' . $file->page . '_' . $outputId . '.jpg';
                        file_put_contents($tempFilePath, $decoded);
                        $tempFiles[] = $tempFilePath;
                        $zip->addFile($tempFilePath, $pageName);
                    }
                } else {
                    $filePath = App::getRootPath() . '/public' . $file->file_path;
                    if (file_exists($filePath)) {
                        $zip->addFile($filePath, $pageName);
                    }
                }
            }

            $zip->close();
        } finally {
            foreach ($tempFiles as $tempFile) {
                if (file_exists($tempFile)) {
                    @unlink($tempFile);
                }
            }
        }

        return $zipPath;
    }

    /**
     * 删除输出记录及所有关联文件
     * @param int $outputId
     * @return bool
     */
    public function deleteOutput(int $outputId): bool
    {
        $files = PostOutputFile::where('output_id', $outputId)->select();

        foreach ($files as $file) {
            $filePath = App::getRootPath() . '/public' . $file->file_path;
            if (file_exists($filePath)) {
                @unlink($filePath);
            }
        }

        PostOutputFile::where('output_id', $outputId)->delete();
        PostOutput::destroy($outputId);

        return true;
    }

    /**
     * 创建输出记录
     * @param int $postId 文章ID
     * @param array $config 配置
     * @param int $adminId 管理员ID
     * @return PostOutput
     */
    public function createOutput(int $postId, array $config, int $adminId): PostOutput
    {
        return PostOutput::create([
            'post_id' => $postId,
            'output_type' => 'phone_image',
            'config' => $config,
            'status' => PostOutput::STATUS_PROCESSING,
            'page_count' => 0,
            'admin_id' => $adminId,
        ]);
    }

    /**
     * 完成输出记录 - 更新状态和页数
     */
    public function completeOutput(int $outputId, int $pageCount): bool
    {
        return PostOutput::where('id', $outputId)->update([
            'status' => PostOutput::STATUS_COMPLETED,
            'page_count' => $pageCount,
        ]) > 0;
    }

    /**
     * 仅保存配置（不生成图片），创建新的历史记录
     * @param int $postId 文章ID
     * @param array $config 配置(含 size/fontSize/watermark/pageAlignments/content_html)
     * @param int $adminId 管理员ID
     * @return PostOutput
     */
    public static function saveConfigOnly(int $postId, array $config, int $adminId): PostOutput
    {
        return PostOutput::create([
            'post_id' => $postId,
            'output_type' => 'phone_image',
            'config' => $config,
            'status' => PostOutput::STATUS_PROCESSING,
            'page_count' => 0,
            'admin_id' => $adminId,
        ]);
    }
}