mint/api-v13/app/Http/Controllers/Library/BookController.php

<?php

namespace App\Http\Controllers\Library;

use App\DTO\Search\HitItemDTO;
use App\Http\Api\ChannelApi;
use App\Http\Api\StudioApi;
use App\Http\Controllers\Controller;
use App\Models\PaliText;
use App\Models\ProgressChapter;
use App\Models\Sentence;
use App\Services\ChapterService;
use App\Services\OpenSearchService;
use App\Services\PaliTextService;
use Illuminate\Http\Request;

class BookController extends Controller
{
    protected $maxChapterLen = 50000;

    protected $minChapterLen = 100;

    /**
     * 构造函数，注入 OpenSearchService
     */
    public function __construct(
        protected OpenSearchService $searchService,
        protected PaliTextService $paliTextService
    ) {}

    public function show(string $id)
    {
        $bookRaw = $this->loadBook($id);

        if (! $bookRaw) {
            abort(404);
        }

        // 查询章节
        $channelId = $bookRaw->channel_id; // 替换为具体的 channel_id 值

        $book = $this->getBookInfo($bookRaw);
        $book['contents'] = $this->getBookToc($bookRaw->book, $bookRaw->para, $channelId);

        // 获取其他版本
        $others = ProgressChapter::with('channel.owner')
            ->where('book', $bookRaw->book)
            ->where('para', $bookRaw->para)
            ->whereHas('channel', function ($query) {
                $query->where('status', 30);
            })
            ->where('progress', '>', 0.2)
            ->get();

        $otherVersions = [];
        $others->each(function ($book) use (&$otherVersions) {
            $otherVersions[] = $this->getBookInfo($book);
        });

        return view('library.tipitaka.show', compact('book', 'otherVersions'));
    }

    private function fetchCommentary(int $book, int $paraStart, int $paraEnd, string $channelId)
    {
        $notes = Sentence::where('book_id', $book)
            ->whereBetween('paragraph', [$paraStart, $paraEnd])
            ->where('channel_uid', $channelId)
            ->select(['uid', 'book_id', 'paragraph', 'word_start', 'word_end'])->get()->toArray();

        return $notes;
    }

    private function injectNoteMarkers(string $html, array $notesMap): string
    {
        if (empty($notesMap)) {
            return $html;
        }

        return preg_replace_callback(
            '/(<div class=\'sentence\' data-sid=\'([^\']+)\')/',
            function ($matches) use ($notesMap) {
                $sid = $matches[2];
                if (! isset($notesMap[$sid])) {
                    return $matches[0];
                }
                $uid = $notesMap[$sid];

                return $matches[1]." data-note-id='{$uid}'";
            },
            $html
        );
    }

    public function read(Request $request, string $id)
    {

        $channelId = $request->input('channel');
        $openSearchId = "tipitaka_chapter_{$id}_{$channelId}";

        try {
            $chapter = HitItemDTO::fromArray($this->searchService->get($openSearchId))->toArray();
        } catch (\Throwable $th) {
            $chapter = [
                'category' => [],
                'title' => '',
                'display' => '',

            ];
        }

        [$bookId, $paraId] = explode('-', $id);
        if ($request->has('comm')) {
            $currChapter = $this->paliTextService->getCurrChapter($bookId, $paraId);
            $commentaries = $this->fetchCommentary($bookId, $paraId, $paraId + $currChapter->chapter_len - 1, $request->input('comm'));
            // sid 格式：{book_id}-{paragraph}-{word_start}-{word_end}
            $notesMap = collect($commentaries)->keyBy(function ($note) {
                return "{$note['book_id']}-{$note['paragraph']}-{$note['word_start']}-{$note['word_end']}";
            })->map(fn ($note) => $note['uid'])->toArray();
        }

        $chapterService = app(ChapterService::class);

        $book = [];

        $book['toc'] = $this->getBookToc((int) $bookId, (int) $paraId, $channelId, 2, 7);
        $channel = ChannelApi::getById($channelId);
        $studio = StudioApi::getById($channel['studio_id']);
        $book['categories'] = $chapter['category'];
        $book['title'] = $chapter['title'];
        $book['author'] = $channel['name'];
        $book['studio'] = $studio;
        $book['tags'] = [];

        $book['pagination'] = $this->pagination((int) $bookId, (int) $paraId, $channelId);

        if (isset($notesMap)) {
            $book['content'] = $this->injectNoteMarkers($chapter['display'], $notesMap);
        } else {
            $book['content'] = $chapter['display'];
        }
        $allChannels = $chapterService->publicChannels((int) $bookId, (int) $paraId);
        $commentaryChannels = array_filter($allChannels, function ($channel) {
            return $channel['type'] === 'commentary';
        });
        $channels = array_filter($allChannels, function ($channel) {
            return $channel['type'] !== 'commentary';
        });

        $editor_link = config('mint.server.dashboard_base_path')
            ."/workspace/tipitaka/chapter/{$id}?channel={$channelId}";

        $view = view('library.book.read', compact('book', 'channels', 'editor_link', 'commentaryChannels'));

        return $view;
    }

    private function loadBook(string $id)
    {
        $book = ProgressChapter::with('channel.owner')->find($id);

        return $book;
    }

    public function toggleTheme(Request $request)
    {
        $theme = $request->input('theme', 'light');
        session(['theme' => $theme]);

        return response()->json(['status' => 'success']);
    }

    private function getBookInfo($book)
    {
        $title = $book->title;
        if (empty($title)) {
            $title = PaliText::where('book', $book->book)
                ->where('paragraph', $book->para)->first()->toc;
        }

        return [
            'id' => $book->uid,
            'title' => $title,
            'author' => $book->channel->name,
            'publisher' => $book->channel->owner,
            'type' => __('label.'.$book->channel->type),
            'category_id' => 11,
            'cover' => '/assets/images/cover/1/214.jpg',
            'description' => $book->summary ?? '',
            'language' => __('language.'.$book->channel->lang),
        ];
    }

    private function getBookToc(int $book, int $paragraph, string $channelId, $minLevel = 2, $maxLevel = 2): array
    {
        $currBook = $this->bookStart($book, $paragraph);

        $start = $currBook->paragraph;
        $end = $currBook->paragraph + $currBook->chapter_len - 1;

        $paliTexts = PaliText::where('book', $book)
            ->whereBetween('paragraph', [$start, $end])
            ->whereBetween('level', [$minLevel, $maxLevel])
            ->orderBy('paragraph')
            ->get();

        if ($paliTexts->isEmpty()) {
            return [];
        }

        $chapters = ProgressChapter::where('book', $book)
            ->whereBetween('para', [$start, $end])
            ->where('channel_id', $channelId)
            ->orderBy('para')
            ->get();

        // keyBy 建索引，map 里 O(1) 查找，完全避免 toArray() 序列化和 array_filter O(n×m) 扫描
        $chaptersIndexed = $chapters->keyBy('para');

        // 当前阅读章节的 toc id，用于高亮（active）与折叠展开（hide）
        $currentId = "{$book}-{$paragraph}";

        // 折叠逻辑：列表有序，父节点 = 之前最近的更小 level 节点
        // 参见 AnthologyReadController::buildCollapsedToc()
        $parents = [];  // id => parent_id|null
        $stack = [];  // 祖先栈 [ ['id'=>..., 'level'=>...], ... ]
        foreach ($paliTexts as $paliText) {
            $id = "{$paliText->book}-{$paliText->paragraph}";
            $level = (int) $paliText->level;
            while (! empty($stack) && $stack[count($stack) - 1]['level'] >= $level) {
                array_pop($stack);
            }
            $parents[$id] = empty($stack) ? null : $stack[count($stack) - 1]['id'];
            $stack[] = ['id' => $id, 'level' => $level];
        }

        // 当前节点的祖先链
        $ancestorSet = [];
        $cursor = $currentId;
        while (! empty($parents[$cursor])) {
            $cursor = $parents[$cursor];
            $ancestorSet[$cursor] = true;
        }

        // 需要展开子节点的集合 = 祖先链 + 当前节点
        $expandParentSet = $ancestorSet;
        $expandParentSet[$currentId] = true;

        // 顶层 level（列表中最浅的一层，折叠模式下始终可见）
        $topLevel = (int) $paliTexts->min('level');

        return $paliTexts->map(function ($paliText) use ($chaptersIndexed, $channelId, $currentId, $parents, $expandParentSet, $topLevel) {
            $id = "{$paliText->book}-{$paliText->paragraph}";
            $level = (int) $paliText->level;
            $title = $paliText->toc;
            $summary = '';
            $progress = 0;
            $disabled = true;

            /** @var ProgressChapter|null $chapter */
            $chapter = $chaptersIndexed->get($paliText->paragraph);
            if ($chapter) {
                if (! empty($chapter->title)) {
                    $title = $chapter->title;
                }
                if (! empty($chapter->summary)) {
                    $summary = $chapter->summary;
                }
                $progress = (int) ($chapter->progress * 100);
                $disabled = false;
            }

            $parentId = $parents[$id];
            // 折叠模式可见：顶层节点，或父节点在展开集合中（祖先链 / 当前节点的直接子节点）
            $visible = $level === $topLevel
                || ($parentId !== null && isset($expandParentSet[$parentId]));

            return [
                'id' => $id,
                'channel' => $channelId,
                'title' => $title,
                'summary' => $summary,
                'progress' => $progress,
                'level' => $level,
                'disabled' => $disabled,
                'active' => $id === $currentId,
                'hide' => ! $visible,
            ];
        })->all();
    }

    public function getBookCategory($book, $paragraph)
    {
        $tags = PaliText::with('tagMaps.tags')
            ->where('book', $book)
            ->where('paragraph', $paragraph)
            ->first()->tagMaps->map(function ($tagMap) {
                return $tagMap->tags;
            })->toArray();

        return $tags;
    }

    private function bookStart($book, $paragraph)
    {
        $currBook = PaliText::where('book', $book)
            ->where('paragraph', '<=', $paragraph)
            ->where('level', 1)
            ->orderBy('paragraph', 'desc')
            ->first();

        return $currBook;
    }

    public function pagination(int $book, int $para, string $channelId)
    {
        $currBook = $this->bookStart($book, $para);
        $start = $currBook->paragraph;
        $end = $currBook->paragraph + $currBook->chapter_len - 1;
        // 查询起始段落
        $paragraphs = PaliText::where('book', $book)
            ->whereBetween('paragraph', [$start, $end])
            ->where('level', '<', 8)
            ->orderBy('paragraph')
            ->get();
        $curr = $paragraphs->firstWhere('paragraph', $para);
        $current = $curr; // 实际显示的段落
        $endParagraph = $curr->paragraph + $curr->chapter_len - 1;
        if ($curr->chapter_strlen > $this->maxChapterLen) {
            // 太大了，修改结束位置 找到下一级
            foreach ($paragraphs as $key => $paragraph) {
                if ($paragraph->paragraph > $curr->paragraph) {
                    if ($paragraph->chapter_strlen <= $this->maxChapterLen) {
                        $endParagraph = $paragraph->paragraph + $paragraph->chapter_len - 1;
                        $current = $paragraph;
                        break;
                    }
                    if ($paragraph->level <= $curr->level) {
                        // 不能往下走了，就是它了
                        $endParagraph = $paragraphs[$key - 1]->paragraph + $paragraphs[$key - 1]->chapter_len - 1;
                        $current = $paragraph;
                        break;
                    }
                }
            }
        }
        $start = $curr->paragraph;
        $end = $endParagraph;
        $nextPali = $this->next($current->book, $current->paragraph, $current->level);
        $prevPali = $this->prev($current->book, $current->paragraph, $current->level);

        $next = null;
        if ($nextPali) {
            $nextTranslation = ProgressChapter::with('channel.owner')
                ->where('book', $nextPali->book)
                ->where('para', $nextPali->paragraph)
                ->where('channel_id', $channelId)
                ->first();
            if ($nextTranslation) {
                if (! empty($nextTranslation->title)) {
                    $next['title'] = $nextTranslation->title;
                } else {
                    $next['title'] = $nextPali->toc;
                }
                $next['id'] = "{$nextPali->book}-{$nextPali->paragraph}";
            }
        }

        $prev = null;
        if ($prevPali) {
            $prevTranslation = ProgressChapter::with('channel.owner')
                ->where('book', $prevPali->book)
                ->where('para', $prevPali->paragraph)
                ->where('channel_id', $channelId)
                ->first();
            if ($prevTranslation) {
                if (! empty($prevTranslation->title)) {
                    $prev['title'] = $prevTranslation->title;
                } else {
                    $prev['title'] = $prevPali->toc;
                }
                $prev['id'] = "{$prevPali->book}-{$prevPali->paragraph}";
            }
        }

        return compact('start', 'end', 'next', 'prev');
    }

    public function next($book, $paragraph, $level)
    {
        $next = PaliText::where('book', $book)
            ->where('paragraph', '>', $paragraph)
            ->where('level', $level)
            ->orderBy('paragraph')
            ->first();

        return $next ?? null;
    }

    public function prev($book, $paragraph, $level)
    {
        $prev = PaliText::where('book', $book)
            ->where('paragraph', '<', $paragraph)
            ->where('level', $level)
            ->orderBy('paragraph', 'desc')
            ->first();

        return $prev ?? null;
    }

    public function show2($id)
    {
        // Sample book data (replace with database query)
        $book = [
            'title' => 'Sample Book Title',
            'author' => 'John Doe',
            'category' => 'Fiction',
            'tags' => ['Adventure', 'Mystery', 'Bestseller'],
            'toc' => ['Introduction', 'Chapter 1', 'Chapter 2', 'Conclusion'],
            'content' => [
                'This is the introduction to the book...',
                'Chapter 1 content goes here...',
                'Chapter 2 content goes here...',
                'Conclusion of the book...',
            ],
            'downloads' => [
                ['format' => 'PDF', 'url' => '#'],
                ['format' => 'EPUB', 'url' => '#'],
                ['format' => 'MOBI', 'url' => '#'],
            ],
        ];

        // Sample related books (replace with database query)
        $relatedBooks = [
            [
                'title' => 'Related Book 1',
                'description' => 'A thrilling adventure...',
                'image' => 'https://via.placeholder.com/300x200',
                'link' => '#',
            ],
            [
                'title' => 'Related Book 2',
                'description' => 'A mystery novel...',
                'image' => 'https://via.placeholder.com/300x200',
                'link' => '#',
            ],
            [
                'title' => 'Related Book 3',
                'description' => 'A bestseller...',
                'image' => 'https://via.placeholder.com/300x200',
                'link' => '#',
            ],
        ];

        return view('library.book.read2', compact('book', 'relatedBooks'));
    }
}