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

const portfolioSchema = z.object({
    title: z.string().min(1, 'Title is required'),
    slug: z.string().min(1, 'Slug is required').regex(/^[a-z0-9-]+$/, 'Slug must be lowercase letters, numbers, and hyphens only'),
    description: z.string().min(1, 'Description is required'),
    technologies: z.string().nullable().optional(),
    imageUrl: z.string().nullable().optional(),
    clientName: z.string().nullable().optional(),
    industry: z.string().nullable().optional(),
    testimonials: z.string().nullable().optional(),
});


// GET /api/admin/portfolio — List all portfolio items
export const getAllPortfolioItems = async (_req: Request, res: Response) => {
    try {
        const items = await prisma.portfolioItem.findMany({
            orderBy: { createdAt: 'desc' },
            include: { author: { select: { name: true, email: true } } },
        });
        return res.json(items);
    } catch (error) {
        console.error('Get portfolio items error:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};

// GET /api/admin/portfolio/:id — Get single portfolio item
export const getPortfolioItem = async (req: Request, res: Response) => {
    try {
        const item = await prisma.portfolioItem.findUnique({
            where: { id: req.params.id },
            include: { author: { select: { name: true, email: true } } },
        });
        if (!item) return res.status(404).json({ error: 'Not found' });
        return res.json(item);
    } catch (error) {
        console.error('Get portfolio item error:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};

// POST /api/admin/portfolio — Create portfolio item
export const createPortfolioItem = async (req: Request, res: Response) => {
    try {
        const validatedData = portfolioSchema.parse(req.body);
        const { title, slug, description, technologies, imageUrl, clientName, industry, testimonials } = validatedData;

        // Check slug uniqueness
        const existing = await prisma.portfolioItem.findUnique({ where: { slug } });
        if (existing) {
            return res.status(409).json({ error: 'Slug already exists' });
        }

        const item = await prisma.portfolioItem.create({
            data: {
                title,
                slug,
                description,
                technologies: technologies || null,
                imageUrl: imageUrl || null,
                clientName: clientName || null,
                industry: industry || null,
                testimonials: testimonials || null,
            },
        });

        return res.status(201).json(item);
    } catch (error: any) {
        if (error instanceof z.ZodError) {
            return res.status(400).json({ error: error.errors[0].message });
        }
        console.error('Create portfolio item error:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};

// PATCH /api/admin/portfolio/:id — Update portfolio item
export const updatePortfolioItem = async (req: Request, res: Response) => {
    try {
        const { id } = req.params;
        const validatedData = portfolioSchema.partial().parse(req.body);
        const { title, slug, description, technologies, imageUrl, clientName, industry, testimonials } = validatedData;

        // Check item exists
        const existing = await prisma.portfolioItem.findUnique({ where: { id } });
        if (!existing) return res.status(404).json({ error: 'Not found' });

        // Check slug uniqueness if changed
        if (slug && slug !== existing.slug) {
            const slugExists = await prisma.portfolioItem.findUnique({ where: { slug } });
            if (slugExists) return res.status(409).json({ error: 'Slug already exists' });
        }

        const item = await prisma.portfolioItem.update({
            where: { id },
            data: {
                ...(title !== undefined && { title }),
                ...(slug !== undefined && { slug }),
                ...(description !== undefined && { description }),
                ...(technologies !== undefined && { technologies }),
                ...(imageUrl !== undefined && { imageUrl }),
                ...(clientName !== undefined && { clientName }),
                ...(industry !== undefined && { industry }),
                ...(testimonials !== undefined && { testimonials }),
            },
        });

        return res.json(item);
    } catch (error: any) {
        if (error instanceof z.ZodError) {
            return res.status(400).json({ error: error.errors[0].message });
        }
        console.error('Update portfolio item error:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};

// DELETE /api/admin/portfolio/:id — Delete portfolio item
export const deletePortfolioItem = async (req: Request, res: Response) => {
    try {
        const { id } = req.params;

        const existing = await prisma.portfolioItem.findUnique({ where: { id } });
        if (!existing) return res.status(404).json({ error: 'Not found' });

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

        return res.json({ message: 'Deleted successfully' });
    } catch (error) {
        console.error('Delete portfolio item error:', error);
        return res.status(500).json({ error: 'Internal server error' });
    }
};