import { NextRequest, NextResponse } from 'next/server';
import { prisma } from '@/lib/prisma';
import { requireApiAuth } from '@/lib/api-auth';
import { cleanupAccidentalStandaloneInlineCode, markdownToImportHtml } from '@/lib/markdown-import';
import { MAX_TITLE_LENGTH, safeParseTags, normalizeTags } from '@/lib/page-utils';

export async function GET(request: NextRequest) {
    const authError = await requireApiAuth();
    if (authError) return authError;

    try {
        const searchParams = request.nextUrl.searchParams;
        // lightweight 模式：不返回 content，用于侧边栏等场景
        const lightweight = searchParams.get('lightweight') === 'true';
        const page = parseInt(searchParams.get('page') || '0', 10);
        const limit = parseInt(searchParams.get('limit') || '0', 10);

        // 默认行为：返回所有页面（向后兼容）
        const usePagination = limit > 0 && limit <= 1000 && page > 0;

        if (!usePagination) {
            const pages = await prisma.page.findMany({
                orderBy: [{ order: 'asc' }, { createdAt: 'desc' }],
            });
            const parsedPages = pages.map((p) => ({
                ...p,
                content: lightweight ? '' : p.content,
                tags: safeParseTags(p.tags),
            }));
            return NextResponse.json(parsedPages);
        }

        // 分页查询
        const skip = (page - 1) * limit;
        const [pages, total] = await Promise.all([
            prisma.page.findMany({
                skip,
                take: limit,
                orderBy: [{ order: 'asc' }, { createdAt: 'desc' }],
            }),
            prisma.page.count(),
        ]);

        const parsedPages = pages.map((p) => ({
            ...p,
            content: lightweight ? '' : p.content,
            tags: safeParseTags(p.tags),
        }));

        return NextResponse.json({
            data: parsedPages,
            pagination: {
                page,
                limit,
                total,
                totalPages: Math.ceil(total / limit),
            },
        });
    } catch {
        return NextResponse.json({ error: 'Error fetching pages' }, { status: 500 });
    }
}

export async function POST(request: Request) {
    const authError = await requireApiAuth();
    if (authError) return authError;

    try {
        const body = await request.json().catch(() => null);
        if (!body || typeof body !== 'object') {
            return NextResponse.json({ error: 'Invalid request body' }, { status: 400 });
        }

        const rawTitle = typeof body.title === 'string' ? body.title.trim() : '';
        const title = rawTitle || '无标题';
        if (title.length > MAX_TITLE_LENGTH) {
            return NextResponse.json({ error: 'Title too long' }, { status: 400 });
        }

        const type = body.type === 'folder' ? 'folder' : 'file';
        const importMarkdown = typeof body.importMarkdown === 'string' ? body.importMarkdown : null;
        const rawContent = typeof body.content === 'string' ? body.content : '';
        const content = cleanupAccidentalStandaloneInlineCode(
            importMarkdown !== null ? markdownToImportHtml(importMarkdown) : rawContent
        );
        if (importMarkdown !== null && process.env.NODE_ENV !== 'production') {
            const lines = importMarkdown.replace(/\r\n?/g, '\n').split('\n');
            const fenceLines = lines
                .map((line: string, idx: number) => (line.trimStart().startsWith('```') || line.trimStart().startsWith('~~~') ? idx + 1 : -1))
                .filter((n: number) => n > 0);
            const preEnd = content.indexOf('</code></pre>');
            console.info(`[import-md][POST] title="${title}" fences=${fenceLines.join(',') || 'none'} preEnd=${preEnd} len=${content.length}`);
        }
        const parentId = typeof body.parentId === 'string' ? body.parentId : null;
        const tags = normalizeTags(body.tags);
        const icon = typeof body.icon === 'string' ? body.icon : null;
        const isLocked = typeof body.isLocked === 'boolean' ? body.isLocked : false;
        const requestedOrder = Number.isInteger(body.order) ? body.order : undefined;

        if (parentId) {
            const parent = await prisma.page.findUnique({
                where: { id: parentId },
                select: { id: true, type: true },
            });
            if (!parent || parent.type !== 'folder') {
                return NextResponse.json({ error: 'Parent folder not found' }, { status: 400 });
            }
        }

        const page = await prisma.page.create({
            data: {
                title,
                content,
                tags: JSON.stringify(tags),
                parentId,
                type,
                order: await (async () => {
                    if (requestedOrder !== undefined) return requestedOrder;
                    const lastPage = await prisma.page.findFirst({
                        where: { parentId },
                        orderBy: { order: 'desc' },
                    });
                    return (lastPage?.order ?? -1) + 1;
                })(),
                icon,
                isLocked,
            },
        });
        return NextResponse.json({ ...page, tags: safeParseTags(page.tags) });
    } catch {
        return NextResponse.json({ error: 'Error creating page' }, { status: 500 });
    }
}