import { and, eq, ne, isNull, isNotNull, lt, count, asc, desc } from 'drizzle-orm';
import { area, project, blocker, dayEntry, user, risk, milestone, type Area, type Project } from '@cockpit/db';
import { router, protectedProcedure } from '../trpc.js';
import { todayIso, previousWerktag } from '../lib/werktag.js';
import { aggregateAreaAmpel } from '../lib/ampel.js';

export const dashboardRouter = router({
  overview: protectedProcedure.query(async ({ ctx }) => {
    const todayDate = todayIso();
    const [
      areas,
      allProjects,
      openBlockers,
      todayPresence,
      totalActiveUsers,
      feedRows,
      showstopperRows,
      milestoneRows,
    ] = await Promise.all([
        ctx.db.select().from(area).orderBy(area.order),
        ctx.db.select().from(project).where(eq(project.archiviert, false)),
        ctx.db.select().from(blocker).where(isNull(blocker.resolvedAt)),
        ctx.db
          .select({ userId: dayEntry.userId, status: dayEntry.status })
          .from(dayEntry)
          .where(eq(dayEntry.date, todayDate)),
        ctx.db.select({ c: count() }).from(user).where(eq(user.active, true)),
        ctx.db
          .select({
            id: dayEntry.id,
            userId: dayEntry.userId,
            userName: user.name,
            date: dayEntry.date,
            ampel: dayEntry.ampel,
            trend: dayEntry.trend,
            reflectionText: dayEntry.reflectionText,
            publishedAt: dayEntry.publishedAt,
          })
          .from(dayEntry)
          .innerJoin(user, eq(user.id, dayEntry.userId))
          // „Gestern im Team": volle Reflexionen vor heute (heutige bleiben privat
          // bis morgen). Unabhängig vom publish-Cron.
          .where(and(lt(dayEntry.date, todayDate), eq(dayEntry.status, 'full')))
          .orderBy(desc(dayEntry.date), desc(dayEntry.reflectedAt))
          .limit(50),
        ctx.db
          .select({
            id: risk.id,
            title: risk.title,
            projectId: risk.projectId,
            projectName: project.name,
          })
          .from(risk)
          .innerJoin(project, eq(project.id, risk.projectId))
          .where(
            and(
              eq(risk.showstopper, true),
              eq(risk.kind, 'risiko'),
              ne(risk.status, 'geschlossen'),
              eq(project.archiviert, false),
            ),
          ),
        // Anstehende Meilensteine (offen/überfällig, mit Datum) projektübergreifend.
        ctx.db
          .select({
            id: milestone.id,
            title: milestone.title,
            due: milestone.due,
            status: milestone.status,
            projectId: milestone.projectId,
            projectName: project.name,
            areaId: project.areaId,
          })
          .from(milestone)
          .innerJoin(project, eq(project.id, milestone.projectId))
          .where(
            and(
              ne(milestone.status, 'done'),
              isNotNull(milestone.due),
              eq(project.archiviert, false),
            ),
          )
          .orderBy(asc(milestone.due))
          .limit(15),
      ]);

    const projectsByArea = new Map<string, Project[]>();
    for (const p of allProjects) {
      const list = projectsByArea.get(p.areaId) ?? [];
      list.push(p);
      projectsByArea.set(p.areaId, list);
    }

    const areaSummaries = areas.map((a: Area) => {
      const projs = projectsByArea.get(a.id) ?? [];
      const agg = aggregateAreaAmpel(projs);
      return {
        id: a.id,
        slug: a.slug,
        name: a.name,
        kind: a.kind,
        ampel: agg.ampel,
        counts: agg.counts,
      };
    });

    const presentToday = new Set(todayPresence.map((p) => p.userId));
    const usersAll = await ctx.db
      .select({ id: user.id, name: user.name })
      .from(user)
      .where(eq(user.active, true));
    const fehlende = usersAll.filter((u) => !presentToday.has(u.id));

    return {
      date: todayDate,
      areas: areaSummaries,
      blockers: openBlockers.map((b) => ({
        id: b.id,
        title: b.title,
        openedAt: b.openedAt,
        areaId: b.areaId,
        projectId: b.projectId,
      })),
      heuteQuote: {
        gepingt: presentToday.size,
        gesamt: totalActiveUsers[0]?.c ?? 0,
        fehlende,
      },
      jourfixe: { nextDate: nextJourfixe(todayDate), label: 'Di 11:00' },
      showstoppers: showstopperRows,
      meilensteine: milestoneRows.map((m) => ({
        ...m,
        ueberfaellig: m.due != null && m.due < todayDate,
      })),
      kritischeModi: allProjects
        .filter((p) => p.modus === 'eskalation' || p.modus === 'taskforce')
        .map((p) => ({ id: p.id, name: p.name, areaId: p.areaId, modus: p.modus })),
      pflichtMinimumOffen: allProjects
        .filter((p) => Object.values(p.pflichtMinimumState).some((v) => v === false))
        .map((p) => ({ id: p.id, name: p.name, areaId: p.areaId })),
      feed: feedRows,
      gestern: previousWerktag(todayDate),
    };
  }),
});

function nextJourfixe(todayIsoDate: string): string {
  // Nächster Dienstag (Default Jourfixe). Wenn heute Dienstag, dann heute.
  const d = new Date(`${todayIsoDate}T00:00:00Z`);
  const wd = d.getUTCDay(); // 0=So..6=Sa
  const offset = (2 - wd + 7) % 7 || 0; // 2=Di
  d.setUTCDate(d.getUTCDate() + offset);
  return d.toISOString().slice(0, 10);
}