import { Request, Response } from 'express';
import prisma from '../models/prisma';
import slugify from 'slugify';

// GET /api/admin/blog
export const getAdminBlogPosts = async (req: Request, res: Response) => {
    try {
        const posts = await prisma.blogPost.findMany({
            orderBy: { createdAt: 'desc' },
            include: { author: { select: { name: true, email: true } } }
        });
        return res.status(200).json(posts);
    } catch (error) {
        console.error('Error fetching admin blog posts:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};

// GET /api/admin/blog/:id
export const getAdminBlogPost = async (req: Request, res: Response) => {
    try {
        const { id } = req.params;
        const post = await prisma.blogPost.findUnique({
            where: { id },
            include: { author: { select: { name: true, email: true } } }
        });
        if (!post) {
            return res.status(404).json({ error: 'Post not found' });
        }
        return res.status(200).json(post);
    } catch (error) {
        console.error('Error fetching admin blog post:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};

// POST /api/admin/blog
export const createAdminBlogPost = async (req: Request, res: Response) => {
    try {
        const userId = (req as any).user.userId;
        const { title, slug, content, excerpt, featuredImage, tags, status, publishedAt } = req.body;

        if (!title || !content) {
            return res.status(400).json({ error: 'Title and content are required' });
        }

        const generatedSlug = slug ? slugify(slug, { lower: true, strict: true }) : slugify(title, { lower: true, strict: true });

        // Check for existing slug
        const existing = await prisma.blogPost.findUnique({ where: { slug: generatedSlug } });
        if (existing) {
            return res.status(400).json({ error: 'A post with this slug already exists' });
        }

        const newPost = await prisma.blogPost.create({
            data: {
                title,
                slug: generatedSlug,
                content,
                excerpt: excerpt || null,
                featuredImage: featuredImage || null,
                tags: tags || null,
                status: status || 'DRAFT',
                publishedAt: publishedAt ? new Date(publishedAt) : null,
                authorId: userId,
            }
        });

        return res.status(201).json(newPost);
    } catch (error) {
        console.error('Error creating admin blog post:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};

// PUT /api/admin/blog/:id
export const updateAdminBlogPost = async (req: Request, res: Response) => {
    try {
        const { id } = req.params;
        const { title, slug, content, excerpt, featuredImage, tags, status, publishedAt } = req.body;

        const existingPost = await prisma.blogPost.findUnique({ where: { id } });
        if (!existingPost) {
            return res.status(404).json({ error: 'Post not found' });
        }

        let updateSlug = existingPost.slug;
        if (slug && slug !== existingPost.slug) {
            updateSlug = slugify(slug, { lower: true, strict: true });
            const checkSlug = await prisma.blogPost.findUnique({ where: { slug: updateSlug } });
            if (checkSlug) {
                return res.status(400).json({ error: 'A post with this slug already exists' });
            }
        }

        const updatedPost = await prisma.blogPost.update({
            where: { id },
            data: {
                title: title !== undefined ? title : existingPost.title,
                slug: updateSlug,
                content: content !== undefined ? content : existingPost.content,
                excerpt: excerpt !== undefined ? excerpt : existingPost.excerpt,
                featuredImage: featuredImage !== undefined ? featuredImage : existingPost.featuredImage,
                tags: tags !== undefined ? tags : existingPost.tags,
                status: status !== undefined ? status : existingPost.status,
                publishedAt: publishedAt !== undefined ? (publishedAt ? new Date(publishedAt) : null) : existingPost.publishedAt,
            }
        });

        return res.status(200).json(updatedPost);
    } catch (error) {
        console.error('Error updating admin blog post:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};

// DELETE /api/admin/blog/:id
export const deleteAdminBlogPost = async (req: Request, res: Response) => {
    try {
        const { id } = req.params;

        const existingPost = await prisma.blogPost.findUnique({ where: { id } });
        if (!existingPost) {
            return res.status(404).json({ error: 'Post not found' });
        }

        await prisma.blogPost.delete({ where: { id } });

        return res.status(200).json({ message: 'Post deleted successfully' });
    } catch (error) {
        console.error('Error deleting admin blog post:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};