"use server";

import { revalidatePath } from "next/cache";
import { redirect } from "next/navigation";
import { db } from "@/db";
import {
  phases,
  tasks,
  deliverables,
  documents,
  payments,
  clients,
  projects,
  comments,
} from "@/db/schema";
import { eq, asc, inArray } from "drizzle-orm";
import { z } from "zod";

// ── CLIENT CRUD ───────────────────────────────────────────────────────────────

const clientSchema = z.object({
  name:       z.string().min(1, "Nome richiesto"),
  brand_name: z.string().min(1, "Brand name richiesto"),
  brief:      z.string(),
});

export async function updateClient(clientId: string, formData: FormData) {
  const parsed = clientSchema.safeParse({
    name:       formData.get("name"),
    brand_name: formData.get("brand_name"),
    brief:      formData.get("brief") ?? "",
  });
  if (!parsed.success) throw new Error(parsed.error.issues[0].message);
  await db.update(clients).set(parsed.data).where(eq(clients.id, clientId));
  revalidatePath(`/admin/clients/${clientId}`);
  revalidatePath("/admin");
}

export async function deleteClient(clientId: string) {
  await db.delete(clients).where(eq(clients.id, clientId));
  revalidatePath("/admin");
  redirect("/admin");
}

export async function setClientArchived(clientId: string, archived: boolean) {
  await db.update(clients).set({ archived }).where(eq(clients.id, clientId));
  revalidatePath(`/admin/clients/${clientId}`);
  revalidatePath("/admin");
}

// ── PHASES ────────────────────────────────────────────────────────────────────

async function getDefaultProjectId(clientId: string): Promise<string | null> {
  const rows = await db
    .select({ id: projects.id })
    .from(projects)
    .where(eq(projects.client_id, clientId))
    .orderBy(asc(projects.created_at))
    .limit(1);
  return rows[0]?.id ?? null;
}

export async function addPhase(clientId: string, formData: FormData) {
  const title = (formData.get("title") as string)?.trim();
  if (!title) throw new Error("Titolo fase richiesto");

  const projectId = await getDefaultProjectId(clientId);
  if (!projectId) throw new Error("Nessun progetto trovato per questo cliente");

  const existingPhases = await db
    .select({ sort_order: phases.sort_order })
    .from(phases)
    .where(eq(phases.project_id, projectId));
  const maxOrder = existingPhases.reduce((max, p) => Math.max(max, p.sort_order), -1);

  await db.insert(phases).values({
    project_id: projectId,
    title,
    sort_order: maxOrder + 1,
    status: "upcoming",
  });
  revalidatePath(`/admin/clients/${clientId}`);
}

export async function updatePhaseStatus(
  phaseId: string,
  clientId: string,
  status: string
) {
  const allowed = ["upcoming", "active", "done"];
  if (!allowed.includes(status)) throw new Error("Stato non valido");
  await db.update(phases).set({ status }).where(eq(phases.id, phaseId));
  revalidatePath(`/admin/clients/${clientId}`);
}

// ── TASKS ─────────────────────────────────────────────────────────────────────

export async function addTask(
  phaseId: string,
  clientId: string,
  formData: FormData
) {
  const title = (formData.get("title") as string)?.trim();
  if (!title) throw new Error("Titolo task richiesto");

  const existingTasks = await db
    .select({ sort_order: tasks.sort_order })
    .from(tasks)
    .where(eq(tasks.phase_id, phaseId));
  const maxOrder = existingTasks.reduce((max, t) => Math.max(max, t.sort_order), -1);

  await db.insert(tasks).values({
    phase_id: phaseId,
    title,
    description: (formData.get("description") as string)?.trim() || null,
    sort_order: maxOrder + 1,
    status: "todo",
  });
  revalidatePath(`/admin/clients/${clientId}`);
}

export async function updateTaskStatus(
  taskId: string,
  clientId: string,
  status: string
) {
  const allowed = ["todo", "in_progress", "done"];
  if (!allowed.includes(status)) throw new Error("Stato non valido");
  await db.update(tasks).set({ status }).where(eq(tasks.id, taskId));
  revalidatePath(`/admin/clients/${clientId}`);
}

// ── DELIVERABLES ──────────────────────────────────────────────────────────────

export async function addDeliverable(
  taskId: string,
  clientId: string,
  formData: FormData
) {
  const title = (formData.get("title") as string)?.trim();
  const url = (formData.get("url") as string)?.trim() || null;
  if (!title) throw new Error("Titolo deliverable richiesto");
  // approved_at is intentionally omitted — immutable constraint: never set by admin here
  await db
    .insert(deliverables)
    .values({ task_id: taskId, title, url, status: "pending" });
  revalidatePath(`/admin/clients/${clientId}`);
}

// ── DOCUMENTS ─────────────────────────────────────────────────────────────────

const docSchema = z.object({
  label: z.string().min(1, "Etichetta richiesta"),
  url: z.string().url("URL non valido"),
});

export async function addDocument(clientId: string, formData: FormData) {
  const parsed = docSchema.safeParse({
    label: formData.get("label"),
    url: formData.get("url"),
  });
  if (!parsed.success) throw new Error(parsed.error.issues[0].message);

  const projectId = await getDefaultProjectId(clientId);
  if (!projectId) throw new Error("Nessun progetto trovato per questo cliente");

  await db.insert(documents).values({ project_id: projectId, ...parsed.data });
  revalidatePath(`/admin/clients/${clientId}`);
}

export async function updateDocument(
  documentId: string,
  clientId: string,
  formData: FormData
) {
  const parsed = docSchema.safeParse({
    label: formData.get("label"),
    url: formData.get("url"),
  });
  if (!parsed.success) throw new Error(parsed.error.issues[0].message);
  await db
    .update(documents)
    .set(parsed.data)
    .where(eq(documents.id, documentId));
  revalidatePath(`/admin/clients/${clientId}`);
}

export async function deleteDocument(documentId: string, clientId: string) {
  await db.delete(documents).where(eq(documents.id, documentId));
  revalidatePath(`/admin/clients/${clientId}`);
}

// ── PAYMENTS ──────────────────────────────────────────────────────────────────

export async function updatePaymentStatus(
  paymentId: string,
  clientId: string,
  status: string
) {
  const allowed = ["da_saldare", "inviata", "saldato"];
  if (!allowed.includes(status)) throw new Error("Stato pagamento non valido");
  const paid_at = status === "saldato" ? new Date() : null;
  await db
    .update(payments)
    .set({ status, paid_at })
    .where(eq(payments.id, paymentId));
  revalidatePath(`/admin/clients/${clientId}`);
}

export async function updateAcceptedTotal(clientId: string, formData: FormData) {
  const raw = (formData.get("accepted_total") as string)?.trim();
  const val = parseFloat(raw);
  if (isNaN(val) || val < 0) throw new Error("Importo non valido");

  // Update accepted_total on client row — denormalized field, quote_items never exposed
  await db
    .update(clients)
    .set({ accepted_total: val.toFixed(2) })
    .where(eq(clients.id, clientId));

  // Get all projects for this client, then update their payment stubs
  const projectRows = await db
    .select({ id: projects.id })
    .from(projects)
    .where(eq(projects.client_id, clientId));

  if (projectRows.length > 0) {
    const projectIds = projectRows.map((p) => p.id);
    const half = (val / 2).toFixed(2);
    const paymentsRows = await db
      .select()
      .from(payments)
      .where(inArray(payments.project_id, projectIds));
    for (const p of paymentsRows) {
      await db.update(payments).set({ amount: half }).where(eq(payments.id, p.id));
    }
  }

  revalidatePath(`/admin/clients/${clientId}`);
}

// ── COMMENTS (admin reply) ────────────────────────────────────────────────────

export async function postAdminComment(clientId: string, formData: FormData) {
  const entity = formData.get("entity") as string;
  const body = (formData.get("body") as string)?.trim();
  if (!body || !entity) throw new Error("Dati mancanti");
  const [entity_type, entity_id] = entity.split(":");
  if (!entity_type || !entity_id) throw new Error("Formato entity non valido");
  const allowedTypes = ["task", "deliverable"];
  if (!allowedTypes.includes(entity_type)) throw new Error("entity_type non valido");
  await db.insert(comments).values({ entity_type, entity_id, author: "admin", body });
  revalidatePath(`/admin/clients/${clientId}`);
}