import { NextRequest } from 'next/server';
import { getRun, getRecentRuns, cancelRun } from '@/lib/db';
import { findAutomation } from '@/lib/automations';
import { corsJson, corsPreflight } from '../cors';

function shape(row: NonNullable<ReturnType<typeof getRun>>) {
    return {
        id: row.id,
        automationId: row.automation_id,
        automationLabel: findAutomation(row.automation_id)?.automation.label ?? row.automation_id,
        status: row.status,
        stepIndex: row.step_index,
        totalSteps: row.total_steps,
        log: (() => { try { return JSON.parse(row.log); } catch { return []; } })(),
        error: row.error,
        createdAt: row.created_at,
        updatedAt: row.updated_at,
    };
}

/** `?id=` for one run, otherwise the recent history the dashboard shows. */
export async function GET(req: NextRequest) {
    const idParam = req.nextUrl.searchParams.get('id');
    if (idParam) {
        const row = getRun(Number(idParam));
        if (!row) return corsJson({ error: 'No such run' }, { status: 404 });
        return corsJson({ run: shape(row) });
    }
    return corsJson({ runs: getRecentRuns(5).map(shape) });
}

/** Stop button. A queued run never starts; a running one halts at the next step. */
export async function DELETE(req: NextRequest) {
    const id = Number(req.nextUrl.searchParams.get('id'));
    if (!Number.isInteger(id) || id <= 0) {
        return corsJson({ error: '`id` is required' }, { status: 400 });
    }
    return corsJson({ cancelled: cancelRun(id) });
}

export async function OPTIONS() {
    return corsPreflight();
}