"use server";

import { revalidatePath } from "next/cache";
import { redirect } from "next/navigation";
import { z } from "zod";
import { moduleGuard } from "@/server/action-guard";
import { writeAuditLog } from "@/server/audit";

const guard = moduleGuard("bia");

const processSchema = z.object({
  name: z.string().trim().min(1).max(200),
  description: z.string().trim().max(5000).optional(),
  category: z.enum(["CORE", "MANAGEMENT", "SUPPORT"]),
  ownerId: z.string().optional(),
});

function parseProcessForm(formData: FormData) {
  const parsed = processSchema.parse({
    name: formData.get("name"),
    description: formData.get("description") || undefined,
    category: formData.get("category"),
    ownerId: formData.get("ownerId") || undefined,
  });
  return {
    ...parsed,
    description: parsed.description || null,
    ownerId: parsed.ownerId || null,
  };
}

export async function createProcess(formData: FormData) {
  const { session, db } = await guard("bia:write");

  const data = parseProcessForm(formData);
  // tenantId explizit für die Typen, der Guard injiziert ohnehin
  const process = await db.process.create({
    data: { ...data, tenantId: session.user.tenantId, createdBy: session.user.id },
  });

  await writeAuditLog({
    tenantId: session.user.tenantId,
    actorId: session.user.id,
    action: "create",
    entity: "process",
    entityId: process.id,
    after: data,
  });
  revalidatePath("/processes");
  redirect(`/processes?edit=${process.id}`);
}

export async function updateProcess(processId: string, formData: FormData) {
  const { session, db } = await guard("bia:write");

  const before = await db.process.findUnique({ where: { id: processId } });
  if (!before) throw new Error("Prozess nicht gefunden");

  const data = parseProcessForm(formData);
  await db.process.update({ where: { id: processId }, data });

  await writeAuditLog({
    tenantId: session.user.tenantId,
    actorId: session.user.id,
    action: "update",
    entity: "process",
    entityId: processId,
    before,
    after: data,
  });
  revalidatePath("/processes");
  redirect(`/processes?detail=${processId}`);
}

export async function deleteProcess(processId: string) {
  const { session, db } = await guard("bia:write");

  const before = await db.process.findUnique({ where: { id: processId } });
  if (!before) throw new Error("Prozess nicht gefunden");

  await db.process.delete({ where: { id: processId } });

  await writeAuditLog({
    tenantId: session.user.tenantId,
    actorId: session.user.id,
    action: "delete",
    entity: "process",
    entityId: processId,
    before,
  });
  revalidatePath("/processes");
  redirect("/processes");
}

export async function assignAsset(processId: string, formData: FormData) {
  const { session, db } = await guard("bia:write");

  const assetId = z.string().min(1).parse(formData.get("assetId"));
  const role = z.enum(["PRIMARY", "SECONDARY"]).parse(formData.get("role"));

  const assetCount = await db.asset.count({ where: { id: assetId } });
  const processCount = await db.process.count({ where: { id: processId } });
  if (assetCount !== 1 || processCount !== 1) throw new Error("Nicht gefunden");

  await db.processAsset.upsert({
    where: { processId_assetId: { processId, assetId } },
    update: { role },
    create: { processId, assetId, role, tenantId: session.user.tenantId },
  });

  await writeAuditLog({
    tenantId: session.user.tenantId,
    actorId: session.user.id,
    action: "update",
    entity: "process_asset",
    entityId: processId,
    after: { processId, assetId, role },
  });
  revalidatePath("/processes");
}

export async function unassignAsset(processId: string, processAssetId: string) {
  const { session, db } = await guard("bia:write");

  const before = await db.processAsset.findUnique({ where: { id: processAssetId } });
  if (!before) return;
  await db.processAsset.delete({ where: { id: processAssetId } });

  await writeAuditLog({
    tenantId: session.user.tenantId,
    actorId: session.user.id,
    action: "delete",
    entity: "process_asset",
    entityId: processAssetId,
    before,
  });
  revalidatePath("/processes");
}

const hours = z
  .union([z.literal(""), z.coerce.number().int().min(0).max(100000)])
  .transform((v) => (v === "" ? null : v));

export async function saveBia(processId: string, formData: FormData) {
  const { session, db } = await guard("bia:write");

  const processCount = await db.process.count({ where: { id: processId } });
  if (processCount !== 1) throw new Error("Prozess nicht gefunden");

  const level = z.coerce.number().int().min(1).max(4);
  const data = {
    rtoHours: hours.parse(formData.get("rtoHours") ?? ""),
    rpoHours: hours.parse(formData.get("rpoHours") ?? ""),
    mtdHours: hours.parse(formData.get("mtdHours") ?? ""),
    impactC: level.parse(formData.get("impactC")),
    impactI: level.parse(formData.get("impactI")),
    impactA: level.parse(formData.get("impactA")),
    notes: (formData.get("notes") as string)?.trim() || null,
  };
  // Kritikalität nach Max-Prinzip aus den Schadenshöhen (SPEC §4.1.2)
  const criticality = Math.max(data.impactC, data.impactI, data.impactA);

  const before = await db.biaEntry.findUnique({ where: { processId } });
  await db.biaEntry.upsert({
    where: { processId },
    update: { ...data, criticality },
    create: { ...data, criticality, processId, tenantId: session.user.tenantId },
  });

  await writeAuditLog({
    tenantId: session.user.tenantId,
    actorId: session.user.id,
    action: before ? "update" : "create",
    entity: "bia_entry",
    entityId: processId,
    before: before ?? undefined,
    after: { ...data, criticality },
  });
  revalidatePath("/processes");
}

/**
 * Kombiniertes Speichern für den aufgeräumten Bearbeiten-Dialog: Stammdaten
 * und BIA in einem Vorgang (ein Speichern-Button). Asset-Zuordnung läuft
 * weiter über die inkrementellen Aktionen assignAsset/unassignAsset.
 */
export async function saveProcessAll(processId: string, formData: FormData) {
  const { session, db } = await guard("bia:write");

  const before = await db.process.findUnique({
    where: { id: processId },
    include: { bia: true },
  });
  if (!before) throw new Error("Prozess nicht gefunden");

  const master = parseProcessForm(formData);
  await db.process.update({ where: { id: processId }, data: master });

  const level = z.coerce.number().int().min(1).max(4);
  const biaData = {
    rtoHours: hours.parse(formData.get("rtoHours") ?? ""),
    rpoHours: hours.parse(formData.get("rpoHours") ?? ""),
    mtdHours: hours.parse(formData.get("mtdHours") ?? ""),
    impactC: level.parse(formData.get("impactC")),
    impactI: level.parse(formData.get("impactI")),
    impactA: level.parse(formData.get("impactA")),
    notes: (formData.get("notes") as string)?.trim() || null,
  };
  const criticality = Math.max(biaData.impactC, biaData.impactI, biaData.impactA);
  await db.biaEntry.upsert({
    where: { processId },
    update: { ...biaData, criticality },
    create: { ...biaData, criticality, processId, tenantId: session.user.tenantId },
  });

  await writeAuditLog({
    tenantId: session.user.tenantId,
    actorId: session.user.id,
    action: "update",
    entity: "process",
    entityId: processId,
    before,
    after: { ...master, bia: { ...biaData, criticality } },
  });
  revalidatePath("/processes");
  redirect(`/processes?detail=${processId}`);
}