<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Storage;
use Barryvdh\DomPDF\Facade\Pdf;
use Parsedown;

class WeekReportController extends Controller
{
    /**
     * 显示周报生成页面
     */
    public function index()
    {
        return view('weekreport.index');
    }

    /**
     * 上传任务图片
     */
    public function uploadImage(Request $request)
    {
        $request->validate([
            'image' => 'required|image|mimes:jpeg,png,jpg,gif,webp|max:10240',
        ]);

        try {
            $file = $request->file('image');
            $filename = time() . '_' . uniqid() . '.' . $file->getClientOriginalExtension();

            // 存储到public目录
            $path = $file->storeAs('uploads', $filename, 'public');

            return response()->json([
                'success' => true,
                'path' => $path,
                'url' => asset('storage/' . $path),
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'message' => '图片上传失败: ' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 生成周报
     */
    public function generate(Request $request)
    {
        // 设置较长的执行时间，因为AI生成可能需要较长时间
        set_time_limit(300); // 5分钟

        $request->validate([
            'tasks' => 'required|array|min:1',
            'tasks.*.description' => 'required|string|max:2000',
            'tasks.*.images' => 'nullable|array',          // 支持多图
            'tasks.*.images.*' => 'nullable|string',       // 每张图片路径
            'week_start' => 'nullable|date',
            'week_end' => 'nullable|date',
            'author' => 'nullable|string|max:100',
            'next_week_tasks' => 'nullable|array',
            'next_week_tasks.*' => 'nullable|string|max:2000',
        ]);

        $tasks = $request->input('tasks');
        $weekStart = $request->input('week_start') ?? date('Y-m-d', strtotime('monday this week'));
        $weekEnd = $request->input('week_end') ?? date('Y-m-d', strtotime('sunday this week'));
        $author = (string) ($request->input('author') ?? '');
        $nextWeekTasks = $request->input('next_week_tasks', []);

        // 构建提示词
        $taskList = $this->buildTaskList($tasks);
        $nextWeekList = $this->buildNextWeekTaskList($nextWeekTasks);
        $prompt = $this->buildPrompt($taskList, $weekStart, $weekEnd, $author, $nextWeekList);

        try {
            // 调用千问API
            $reportContent = $this->callQwenApi($prompt);

            // 插入图片到报告中
            $reportWithImages = $this->insertImagesToReport($reportContent, $tasks);

            return response()->json([
                'success' => true,
                'report' => $reportWithImages,
                'raw_report' => $reportContent,
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'message' => '生成周报失败: ' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 构建任务列表文本
     */
    private function buildTaskList(array $tasks): string
    {
        $list = [];
        foreach ($tasks as $index => $task) {
            $num = $index + 1;
            $desc = trim($task['description']);
            // 支持多图：检查 images 数组
            $images = $task['images'] ?? [];
            $imageCount = count(array_filter($images));
            $hasImage = $imageCount > 0 ? "（有{$imageCount}张截图）" : '';
            $list[] = "{$num}. {$desc}{$hasImage}";
        }
        return implode("\n", $list);
    }

    /**
     * 构建下周任务列表文本
     */
    private function buildNextWeekTaskList(array $tasks): string
    {
        if (empty($tasks)) {
            return '';
        }

        $list = [];
        foreach ($tasks as $index => $desc) {
            if (!empty(trim($desc))) {
                $num = $index + 1;
                $list[] = "{$num}. " . trim($desc);
            }
        }
        return implode("\n", $list);
    }

    /**
     * 构建完整提示词
     */
    private function buildPrompt(string $taskList, string $weekStart, string $weekEnd, string $author, string $nextWeekList = ''): string
    {
        $authorInfo = $author ? "作者：{$author}" : "";

        // 根据是否有下周计划来调整要求
        $nextWeekSection = '';
        $nextWeekRequirement = '';

        if (!empty(trim($nextWeekList))) {
            $nextWeekSection = "\n\n下周计划任务：\n{$nextWeekList}";
            $nextWeekRequirement = "\n8. 添加\"下周工作计划\"部分，简要列出计划要做的事项";
        } else {
            $nextWeekRequirement = "\n8. 不要添加下周工作计划部分";
        }

        return <<<PROMPT
你是一位经验丰富的职场人士，擅长撰写简洁实用的工作周报。请根据以下任务信息，用自然、朴实的语言写一份周报。

时间：{$weekStart} 至 {$weekEnd}
{$authorInfo}

本周工作内容：
{$taskList}{$nextWeekSection}

写作要求：
1. 使用Markdown格式
2. 标题简洁，如"工作周报"或"本周工作汇报"
3. 语言要自然朴实，像正常人写的，避免过于华丽或模板化的表述
4. 不要使用"高效完成"、"圆满完成"、"取得显著成效"等套话
5. 每个任务用简短的一两句话描述即可，说清楚做了什么
6. 可以按项目或类型简单分组，但不要过度分类
7. 【重要】只有标注了"（有截图）"的任务才在该任务描述后紧接着添加"[图片占位符-任务X]"（X是原始任务序号），其他任务不要添加{$nextWeekRequirement}
9. 【重要】不要添加任何总结、小结、回顾等内容
10. 不要出现具体的完成时间、耗时等信息
11. 整体篇幅适中，不要太长
12. 【重要】图片占位符的序号要与原始任务序号的序号一致，不要出现错位


直接输出周报内容：
PROMPT;
    }

    /**
     * 调用千问API
     */
    private function callQwenApi(string $prompt): string
    {
        $apiKey = config('services.qwen.api_key');
        $apiUrl = config('services.qwen.api_url');
        $model = config('services.qwen.model');

        if (empty($apiKey)) {
            throw new \Exception('API Key 未配置');
        }

        $response = Http::timeout(180)
            ->withoutVerifying()
            ->withHeaders([
                'Authorization' => "Bearer {$apiKey}",
                'Content-Type' => 'application/json',
            ])
            ->post($apiUrl, [
                'model' => $model,
                'messages' => [
                    [
                        'role' => 'system',
                        'content' => '你是一位专业的工作周报撰写助手，擅长将简单的任务描述转化为专业、详细的周报内容。'
                    ],
                    [
                        'role' => 'user',
                        'content' => $prompt
                    ]
                ],
                'temperature' => 0.7,
                'max_tokens' => 4000,
            ]);

        if (!$response->successful()) {
            $error = $response->json('error.message') ?? $response->body();
            throw new \Exception("API调用失败: {$error}");
        }

        $data = $response->json();

        if (!isset($data['choices'][0]['message']['content'])) {
            throw new \Exception('API返回数据格式错误');
        }

        return $data['choices'][0]['message']['content'];
    }

    /**
     * 在报告中插入图片（支持多图）
     */
    private function insertImagesToReport(string $report, array $tasks): string
    {
        // 首先尝试替换AI生成的占位符
        foreach ($tasks as $index => $task) {
            $num = $index + 1;

            // 支持多种占位符格式
            $placeholders = [
                "[图片占位符-任务{$num}]",
                "[图片占位符-{$num}]",
                "[图片占位符{$num}]",
                "【图片占位符-任务{$num}】",
                "【图片占位符-{$num}】",
                "【图片占位符{$num}】",
            ];

            // 获取该任务的所有图片
            $images = $task['images'] ?? [];
            $validImages = array_filter($images);

            if (!empty($validImages)) {
                // 构建多图Markdown
                $imagesMarkdown = "\n\n";
                foreach ($validImages as $imgIndex => $imagePath) {
                    $imageUrl = asset('storage/' . $imagePath);
                    $imgNum = $imgIndex + 1;
                    $imagesMarkdown .= "![任务{$num}-截图{$imgNum}]({$imageUrl})\n\n";
                }

                // 替换占位符
                foreach ($placeholders as $placeholder) {
                    $report = str_replace($placeholder, $imagesMarkdown, $report);
                }
            } else {
                // 没有图片时移除所有占位符
                foreach ($placeholders as $placeholder) {
                    $report = str_replace($placeholder, '', $report);
                }
            }
        }

        // 清理所有未使用的占位符（各种格式）
        $report = preg_replace('/\[图片占位符[-]?任务?\d*\]/', '', $report);
        $report = preg_replace('/【图片占位符[-]?任务?\d*】/', '', $report);
        $report = preg_replace('/\[?图片占位符[-—]?\d+\]?/', '', $report);

        // 清理可能产生的多余空行
        $report = preg_replace('/\n{3,}/', "\n\n", $report);

        return $report;
    }

    /**
     * 下载Markdown格式
     */
    public function downloadMarkdown(Request $request)
    {
        $request->validate([
            'content' => 'required|string',
            'filename' => 'nullable|string|max:100',
        ]);

        $content = $request->input('content');
        $filename = $request->input('filename', '周报_' . date('Y-m-d')) . '.md';

        return response($content)
            ->header('Content-Type', 'text/markdown; charset=utf-8')
            ->header('Content-Disposition', 'attachment; filename="' . $filename . '"');
    }

    /**
     * 下载PDF格式
     */
    public function downloadPdf(Request $request)
    {
        $request->validate([
            'content' => 'required|string',
            'filename' => 'nullable|string|max:100',
        ]);

        $markdownContent = $request->input('content');
        $filename = $request->input('filename', '周报_' . date('Y-m-d')) . '.pdf';

        // 将Markdown转换为HTML
        $parsedown = new Parsedown();
        $htmlContent = $parsedown->text($markdownContent);

        // 添加样式
        $styledHtml = $this->wrapHtmlWithStyle($htmlContent);

        // 生成PDF - 启用远程字体和图片
        $pdf = Pdf::loadHTML($styledHtml);
        $pdf->setPaper('A4', 'portrait');
        $pdf->setOption('isRemoteEnabled', true);
        $pdf->setOption('defaultFont', 'sans-serif');

        return $pdf->download($filename);
    }

    /**
     * 为HTML添加样式
     */
    private function wrapHtmlWithStyle(string $html): string
    {
        return <<<HTML
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <style>
        @font-face {
            font-family: 'NotoSansSC';
            src: url('https://fonts.gstatic.com/s/notosanssc/v36/k3kCo84MPvpLmixcA63oeAL7Iqp5IZJF9bmaG9_FnYg.woff2') format('woff2');
            font-weight: normal;
            font-style: normal;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'NotoSansSC', 'SimHei', 'Microsoft YaHei', sans-serif;
            font-size: 14px;
            line-height: 1.8;
            color: #333;
            padding: 40px;
            max-width: 800px;
            margin: 0 auto;
        }
        h1 {
            font-size: 24px;
            color: #1a1a1a;
            border-bottom: 3px solid #4a90d9;
            padding-bottom: 10px;
            margin-bottom: 20px;
        }
        h2 {
            font-size: 18px;
            color: #2c3e50;
            margin-top: 25px;
            margin-bottom: 15px;
            padding-left: 10px;
            border-left: 4px solid #4a90d9;
        }
        h3 {
            font-size: 16px;
            color: #34495e;
            margin-top: 20px;
            margin-bottom: 10px;
        }
        p {
            margin-bottom: 12px;
            text-align: justify;
        }
        ul, ol {
            margin-left: 25px;
            margin-bottom: 15px;
        }
        li {
            margin-bottom: 8px;
        }
        img {
            max-width: 100%;
            height: auto;
            margin: 15px 0;
            border: 1px solid #ddd;
            border-radius: 4px;
        }
        code {
            background-color: #f5f5f5;
            padding: 2px 6px;
            border-radius: 3px;
            font-family: Consolas, monospace;
        }
        pre {
            background-color: #f5f5f5;
            padding: 15px;
            border-radius: 5px;
            overflow-x: auto;
            margin-bottom: 15px;
        }
        blockquote {
            border-left: 4px solid #ddd;
            padding-left: 15px;
            color: #666;
            margin: 15px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 15px 0;
        }
        th, td {
            border: 1px solid #ddd;
            padding: 10px;
            text-align: left;
        }
        th {
            background-color: #f5f5f5;
        }
        hr {
            border: none;
            border-top: 1px solid #ddd;
            margin: 20px 0;
        }
    </style>
</head>
<body>
    {$html}
</body>
</html>
HTML;
    }
}