import { hasPermissions } from "#shared/auth.util";
import useDatabase from '~/composables/useDatabase';
import { explorerContentTable } from '~/db/schema';
import { project, type ProjectItem } from '~/schemas/project';
import { parsePath } from "#shared/general.utils";
import { eq, getTableColumns } from "drizzle-orm";

export default defineEventHandler(async (e) => {
    const { user } = await getUserSession(e);

    if(!user || !hasPermissions(user.permissions, ['admin', 'editor']))
    {
        throw createError({ statusCode: 401, statusText: 'Unauthorized' });
    }

    const body = await readValidatedBody(e, project.safeParse);

    if(!body.success)
    {
        throw body.error;
    }

    const items = buildOrder(body.data.items);

    const db = useDatabase();
    const { content, ...cols } = getTableColumns(explorerContentTable);
    const full = db.select(cols).from(explorerContentTable).all();

    for(let i = full.length - 1; i >= 0; i--)
    {
        if(items.find(e => (e.path === '' ? [e.parent, parsePath(e.name === '' ? e.title : e.name)].filter(e => !!e).join('/') : e.path) === full[i].path))
            full.splice(i, 1);
    }

    db.transaction((tx) => {
        for(let i = 0; i < items.length; i++)
        {
            const item = items[i];

            tx.insert(explorerContentTable).values({ 
                path: item.path,
                owner: user.id,
                title: item.title,
                type: item.type,
                navigable: item.navigable,
                private: item.private,
                order: item.order,
                content: null,
            }).onConflictDoUpdate({
                set: {
                    path: [item.parent, parsePath(item.name === '' ? item.title : item.name)].filter(e => !!e).join('/'),
                    title: item.title,
                    type: item.type,
                    navigable: item.navigable,
                    private: item.private,
                    order: item.order,
                },
                target: explorerContentTable.path,
            }).run();
        }
        for(let i = 0; i < full.length; i++)
        {
            tx.delete(explorerContentTable).where(eq(explorerContentTable.path, full[i].path)).run();
        }
    });
});

function buildOrder(items: ProjectItem[]): ProjectItem[]
{
    items.forEach((e, i) => {
        e.order = i;
        if(e.children) e.children = buildOrder(e.children);
    });

    return items.flatMap(e => [e, ...(e.children ?? [])]);
}