import { avatarUrl } from '$lib/avatar';
import { parseLoadoutDraft } from '$lib/builder/loadout';
import { summarizeLoadout } from '$lib/builder/loadout-summary';
import { getDatabase } from '$lib/server/database';
import { loadSharedBuildSummaryCatalog } from '$lib/server/shared-build-summary';

export type SharedBuildAccessPolicy =
  { kind: 'viewer-page'; viewerId: string | null } | { kind: 'public-preview' };
type BuildVisibility = 'public' | 'unlisted' | 'private';

export async function loadSharedBuildProjection(
  slug: string,
  access: SharedBuildAccessPolicy,
) {
  const database = await getDatabase();
  const build = await (
    await database.prepare(`
		SELECT builds.*,COALESCE(user_profiles.display_name,users.username,'Deleted Agent') AS author,
			user_profiles.public_slug,
			COALESCE(user_profiles.is_public,1) AS profile_is_public,deleted_accounts.user_id AS deleted_user_id,
			user_avatars.source AS avatar_source,user_avatars.value AS avatar_value,
			user_avatars.updated_at AS avatar_updated_at
		FROM builds
		JOIN users ON users.id=builds.owner_id
		LEFT JOIN user_profiles ON user_profiles.user_id=users.id
		LEFT JOIN deleted_accounts ON deleted_accounts.user_id=users.id
		LEFT JOIN user_avatars ON user_avatars.user_id=users.id
		WHERE builds.slug=?
	`)
  ).get(slug);

  if (!build) return null;

  const ownerId = String(build.owner_id);
  const visibility = String(build.visibility) as BuildVisibility;
  const viewerId = access.kind === 'viewer-page' ? access.viewerId : null;
  const accessible =
    access.kind === 'public-preview'
      ? visibility === 'public' || visibility === 'unlisted'
      : visibility === 'public' ||
        visibility === 'unlisted' ||
        (visibility === 'private' && ownerId === viewerId);
  if (!accessible) return null;

  let loadout;
  try {
    loadout = parseLoadoutDraft(JSON.parse(String(build.loadout_json)));
  } catch {
    return null;
  }
  if (!loadout) return null;

  const [gear, weapons, chips, protocols, brands, summaryCatalog] =
    await Promise.all([
      (
        await database.prepare(
          'SELECT id,name,slot,tier,base_armor_min FROM gear',
        )
      ).all(),
      (
        await database.prepare(
          'SELECT id,name,category,is_exotic,rpm,magazine,reload_speed,damage_type,exotic_talent_id FROM weapons',
        )
      ).all(),
      (await database.prepare('SELECT id,name FROM skill_chip_sets')).all(),
      (
        await database.prepare('SELECT id,name,quality FROM os_protocols')
      ).all(),
      (await database.prepare('SELECT id,name FROM brand_sets')).all(),
      loadSharedBuildSummaryCatalog(database),
    ]);
  const summary = summarizeLoadout(loadout, summaryCatalog);

  return {
    build: {
      id: String(build.id),
      title: String(build.title),
      slug: String(build.slug),
      visibility,
      author: String(build.author),
      ownerId,
      authorPublicSlug: build.public_slug ? String(build.public_slug) : null,
      profileAvailable:
        Boolean(build.profile_is_public) && !build.deleted_user_id,
      authorAvatarUrl: avatarUrl(
        build.avatar_source,
        build.avatar_value,
        ownerId,
        build.avatar_updated_at,
      ),
      owner: ownerId === viewerId,
      updatedAt: String(build.updated_at),
    },
    loadout,
    gear,
    weapons,
    chips,
    protocols,
    brands,
    summary,
    attributes: summaryCatalog.attributes,
    talents: summaryCatalog.talents,
  };
}