import { fail, redirect } from '@sveltejs/kit';
import type { Actions, PageServerLoad } from './$types';
import { db } from '$lib/server/db';
import { projects, projectLinks } from '$lib/server/db/schema';
import { LINK_KINDS } from '$lib/config';
import { newId, slugify } from '$lib/markdown';
import { eq } from 'drizzle-orm';

export const load: PageServerLoad = async ({ locals }) => {
  if (!locals.user) redirect(302, '/login');
  return {};
};

export const actions: Actions = {
  default: async ({ request, locals }) => {
    const data = await request.formData();
    const title = (data.get('title') ?? '').toString().trim();
    const slugRaw = (data.get('slug') ?? '').toString().trim();
    const summary = (data.get('summary') ?? '').toString().trim();
    const bodyMd = (data.get('body_md') ?? '').toString();
    const coverUrl = (data.get('cover_url') ?? '').toString().trim() || null;

    const values = { title, slug: slugRaw, summary, body_md: bodyMd, cover_url: coverUrl };

    if (!locals.user) return fail(401, { error: 'Not authenticated', values });
    if (!title) return fail(400, { error: 'Title is required.', values });
    if (!summary) return fail(400, { error: 'Summary is required.', values });

    const slug = slugify(slugRaw || title);
    if (!slug) return fail(400, { error: 'Slug could not be generated.', values });

    const exists = db.select({ id: projects.id }).from(projects).where(eq(projects.slug, slug)).get();
    if (exists) {
      return fail(400, { error: `A project with slug "${slug}" already exists.`, values });
    }

    const kinds = data.getAll('link_kind').map(String);
    const labels = data.getAll('link_label').map(String);
    const urls = data.getAll('link_url').map(String);

    const linksToInsert: { kind: string; label: string; url: string; position: number }[] = [];
    for (let i = 0; i < kinds.length; i++) {
      const k = kinds[i];
      const l = (labels[i] ?? '').trim();
      const u = (urls[i] ?? '').trim();
      if (!u) continue;
      if (!(LINK_KINDS as readonly string[]).includes(k)) continue;
      linksToInsert.push({ kind: k, label: l || u, url: u, position: i });
    }

    const id = newId('prj');
    db.insert(projects)
      .values({
        id,
        slug,
        title,
        summary,
        bodyMd,
        coverUrl,
        authorId: locals.user.id,
        status: 'published'
      })
      .run();

    for (const link of linksToInsert) {
      db.insert(projectLinks)
        .values({
          id: newId('lnk'),
          projectId: id,
          kind: link.kind as (typeof LINK_KINDS)[number],
          label: link.label,
          url: link.url,
          position: link.position
        })
        .run();
    }

    redirect(303, `/projects/${slug}`);
  }
};