import { describe, it, expect } from "vitest";
import {
  ORDER_STATUSES,
  NEXT_STATUS,
  isKnownOrderStatus,
  nextOrderStatus,
  resolveAdvanceAction,
  buildOrderInboxItem,
} from "@/lib/order-flow";

describe("order-flow — server-renderad advance-resolution (ADR-0001)", () => {
  it("flödets fem steg har nästa status", () => {
    expect(NEXT_STATUS.draft).toBe("quoted");
    expect(NEXT_STATUS.accepted).toBe("delivered");
  });

  it("aktivt steg → available", () => {
    expect(resolveAdvanceAction("draft")).toMatchObject({ state: "available" });
    expect(resolveAdvanceAction("review")).toMatchObject({ state: "available" });
  });

  it("terminalt steg → read_only/read_only_resource (inte fake available)", () => {
    expect(resolveAdvanceAction("delivered")).toMatchObject({ state: "read_only", reason: "read_only_resource" });
    expect(resolveAdvanceAction("cancelled")).toMatchObject({ state: "read_only", reason: "read_only_resource" });
  });
});

describe("order-flow — kanonisk statusmaskin (ADR-0002, C3)", () => {
  const TERMINAL: ReadonlySet<string> = new Set(["delivered", "cancelled"]);
  const EXPECTED_NEXT: Record<string, string | null> = {
    draft: "quoted",
    quoted: "in_production",
    in_production: "review",
    review: "accepted",
    accepted: "delivered",
    delivered: null,
    cancelled: null,
  };

  it("ORDER_STATUSES är utömmande: varje känd status → korrekt nästa/read_only", () => {
    expect(ORDER_STATUSES).toHaveLength(7);
    for (const status of ORDER_STATUSES) {
      expect(isKnownOrderStatus(status), `känd status: ${status}`).toBe(true);
      if (TERMINAL.has(status)) {
        expect(nextOrderStatus(status), `${status} är terminal`).toBeNull();
        expect(resolveAdvanceAction(status)).toMatchObject({ state: "read_only", reason: "read_only_resource" });
        expect(buildOrderInboxItem({ order_id: "abcd1234-5678", status, flow: "custom" })).toBeNull();
      } else {
        expect(nextOrderStatus(status)).toBe(EXPECTED_NEXT[status]);
        expect(resolveAdvanceAction(status)).toMatchObject({ state: "available" });
      }
    }
  });

  it("flödet är en linjedraft→…→delivered-kedja utan genvägar", () => {
    let cursor: string | null = "draft";
    const walked: string[] = [];
    while (cursor) {
      walked.push(cursor);
      cursor = nextOrderStatus(cursor);
    }
    expect(walked).toEqual(["draft", "quoted", "in_production", "review", "accepted", "delivered"]);
  });

  it("okänd status (fri text ur DB) → read_only, ingen nästa, ingen inbox-post (guardad)", () => {
    for (const status of ["klar", "Klar", "done", "", "in prod", "cancelled "]) {
      expect(isKnownOrderStatus(status)).toBe(false);
      expect(nextOrderStatus(status)).toBeNull();
      expect(resolveAdvanceAction(status)).toMatchObject({ state: "read_only", reason: "read_only_resource" });
      expect(buildOrderInboxItem({ order_id: "abcd1234-5678", status, flow: "custom" })).toBeNull();
    }
  });

  it("cancelled ingår i unionen (används som terminal status i tests/produkten)", () => {
    expect(ORDER_STATUSES).toContain("cancelled");
  });
});

describe("order-flow — inbox-projektion (våg 3.3)", () => {
  const order = (over: Partial<{ order_id: string; status: string; flow: string; total_ore: number }> = {}) => ({
    order_id: "abcd1234-5678",
    status: "review",
    flow: "custom",
    total_ore: 500000,
    ...over,
  });

  it("review-order → approval-post med hög prioritet och advance-action", () => {
    const item = buildOrderInboxItem(order());
    expect(item).toMatchObject({ kind: "approval", priority: "high", state: "open" });
    expect(item!.actions?.[0].label).toContain("accepted");
    expect(item!.entity).toMatchObject({ type: "order", id: "abcd1234-5678" });
  });

  it("levererad order → ingen post (inkorgen är öppna arbetsobjekt)", () => {
    expect(buildOrderInboxItem(order({ status: "delivered" }))).toBeNull();
    expect(buildOrderInboxItem(order({ status: "cancelled" }))).toBeNull();
  });

  it("draft-order → task med normal prioritet", () => {
    const item = buildOrderInboxItem(order({ status: "draft" }));
    expect(item).toMatchObject({ kind: "task", priority: "normal" });
    expect(item!.subject).toContain("draft");
  });
});