import { describe, it, expect, vi } from "vitest";

// Mock Prisma db so the pure deriveShotStatus function can be tested in isolation
vi.mock("@/lib/db", () => ({ db: {} }));

import {
  deriveShotStatus,
  clearStaleShotApproval,
  markShotForRevisions,
  recalcShotStatus,
} from "./shot-status";
import type { TaskStatus, ShotApprovalStatus } from "@prisma/client";

// Helper to build task arrays quickly
const tasks = (...statuses: TaskStatus[]) => statuses.map((status) => ({ status }));

describe("deriveShotStatus", () => {
  // ── WAITING ───────────────────────────────────────────────────────────────

  it("returns WAITING when there are no tasks", () => {
    expect(deriveShotStatus([], "PENDING", false)).toBe("WAITING");
  });

  it("returns WAITING when no tasks and internally approved (edge case: no tasks)", () => {
    // With INTERNALLY_APPROVED + no tasks the approval fields take precedence
    expect(deriveShotStatus([], "INTERNALLY_APPROVED", false)).toBe("READY_FOR_CLIENT");
  });

  // ── IN_PROGRESS ───────────────────────────────────────────────────────────

  it("returns IN_PROGRESS when a task is TODO", () => {
    expect(deriveShotStatus(tasks("TODO"), "PENDING", false)).toBe("IN_PROGRESS");
  });

  it("returns IN_PROGRESS when a task is IN_PROGRESS", () => {
    expect(deriveShotStatus(tasks("IN_PROGRESS"), "PENDING", false)).toBe("IN_PROGRESS");
  });

  it("returns IN_PROGRESS when tasks are mixed TODO and DONE", () => {
    expect(deriveShotStatus(tasks("TODO", "DONE"), "PENDING", false)).toBe("IN_PROGRESS");
  });

  it("returns IN_PROGRESS for INTERNAL_REVIEW task status (task in internal review)", () => {
    // Task is in INTERNAL_REVIEW — not TODO/IN_PROGRESS/CHANGES → falls through to INTERNAL_REVIEW shot status
    expect(deriveShotStatus(tasks("INTERNAL_REVIEW"), "PENDING", false)).toBe("INTERNAL_REVIEW");
  });

  // ── REVISIONS (highest priority) ─────────────────────────────────────────

  it("returns REVISIONS when any task is CHANGES", () => {
    expect(deriveShotStatus(tasks("CHANGES"), "PENDING", false)).toBe("REVISIONS");
  });

  it("returns REVISIONS even when some tasks are DONE", () => {
    expect(deriveShotStatus(tasks("DONE", "CHANGES"), "PENDING", false)).toBe("REVISIONS");
  });

  it("returns REVISIONS even when shot is INTERNALLY_APPROVED", () => {
    // If somehow a task is in CHANGES after approval, REVISIONS wins
    expect(deriveShotStatus(tasks("CHANGES"), "INTERNALLY_APPROVED", false)).toBe("REVISIONS");
  });

  it("returns REVISIONS even when shot is CLIENT_APPROVED", () => {
    expect(deriveShotStatus(tasks("CHANGES"), "CLIENT_APPROVED", false)).toBe("REVISIONS");
  });

  // ── INTERNAL_REVIEW ───────────────────────────────────────────────────────

  it("returns INTERNAL_REVIEW when all tasks are DONE and approval is PENDING", () => {
    expect(deriveShotStatus(tasks("DONE", "DONE"), "PENDING", false)).toBe("INTERNAL_REVIEW");
  });

  it("returns INTERNAL_REVIEW when tasks are INTERNAL_REVIEW/CLIENT_REVIEW and approval is PENDING", () => {
    expect(deriveShotStatus(tasks("INTERNAL_REVIEW", "CLIENT_REVIEW"), "PENDING", false)).toBe("INTERNAL_REVIEW");
  });

  it("returns INTERNAL_REVIEW when all tasks are DONE, regardless of sharedWithClient", () => {
    // sharedWithClient has no effect when approval is still PENDING
    expect(deriveShotStatus(tasks("DONE"), "PENDING", true)).toBe("INTERNAL_REVIEW");
  });

  // ── READY_FOR_CLIENT ──────────────────────────────────────────────────────

  it("returns READY_FOR_CLIENT when internally approved and not shared", () => {
    expect(deriveShotStatus(tasks("DONE"), "INTERNALLY_APPROVED", false)).toBe("READY_FOR_CLIENT");
  });

  it("returns READY_FOR_CLIENT when internally approved and not shared (no tasks)", () => {
    expect(deriveShotStatus([], "INTERNALLY_APPROVED", false)).toBe("READY_FOR_CLIENT");
  });

  // ── CLIENT_REVIEW ─────────────────────────────────────────────────────────

  it("returns CLIENT_REVIEW when internally approved and shared", () => {
    expect(deriveShotStatus(tasks("DONE"), "INTERNALLY_APPROVED", true)).toBe("CLIENT_REVIEW");
  });

  it("returns CLIENT_REVIEW when internally approved, shared, and tasks still in progress", () => {
    // Approval field takes precedence over task statuses (except CHANGES)
    expect(deriveShotStatus(tasks("TODO"), "INTERNALLY_APPROVED", true)).toBe("CLIENT_REVIEW");
  });

  // ── COMPLETE ──────────────────────────────────────────────────────────────

  it("returns COMPLETE when client approved", () => {
    expect(deriveShotStatus(tasks("DONE"), "CLIENT_APPROVED", true)).toBe("COMPLETE");
  });

  it("returns COMPLETE when client approved even if not shared anymore", () => {
    expect(deriveShotStatus(tasks("DONE"), "CLIENT_APPROVED", false)).toBe("COMPLETE");
  });

  // ── State transition scenarios ────────────────────────────────────────────

  describe("full workflow transitions", () => {
    it("Artist work → tasks TODO → IN_PROGRESS", () => {
      expect(deriveShotStatus(tasks("TODO"), "PENDING", false)).toBe("IN_PROGRESS");
    });

    it("Tasks in internal review → INTERNAL_REVIEW shot status", () => {
      expect(deriveShotStatus(tasks("INTERNAL_REVIEW"), "PENDING", false)).toBe("INTERNAL_REVIEW");
    });

    it("All tasks done → INTERNAL_REVIEW (awaiting supervisor)", () => {
      expect(deriveShotStatus(tasks("DONE", "DONE", "DONE"), "PENDING", false)).toBe("INTERNAL_REVIEW");
    });

    it("Supervisor approves → READY_FOR_CLIENT", () => {
      expect(deriveShotStatus(tasks("DONE"), "INTERNALLY_APPROVED", false)).toBe("READY_FOR_CLIENT");
    });

    it("Producer shares → CLIENT_REVIEW", () => {
      expect(deriveShotStatus(tasks("DONE"), "INTERNALLY_APPROVED", true)).toBe("CLIENT_REVIEW");
    });

    it("Producer unshares → READY_FOR_CLIENT", () => {
      expect(deriveShotStatus(tasks("DONE"), "INTERNALLY_APPROVED", false)).toBe("READY_FOR_CLIENT");
    });

    it("Client approves → COMPLETE", () => {
      expect(deriveShotStatus(tasks("DONE"), "CLIENT_APPROVED", false)).toBe("COMPLETE");
    });

    it("Client requests changes → approval reset to PENDING + task CHANGES → REVISIONS", () => {
      // When changes are requested: shotApprovalStatus → PENDING, sharedWithClient → false, task → CHANGES
      expect(deriveShotStatus(tasks("CHANGES"), "PENDING", false)).toBe("REVISIONS");
    });
  });
});

// ─────────────────────────────────────────────────────────────────────────────
// Fake Prisma client — enough of the surface for the two write helpers. Each
// call mutates the in-memory shot so the assertions read final state, not spies.
// ─────────────────────────────────────────────────────────────────────────────

type FakeTask = { id: string; status: TaskStatus };
type FakeVersion = { id: string; taskId: string; isLatest: boolean; createdAt: Date };

// The helpers take a Prisma client; the fake implements just the calls they make.
type TxArg = Parameters<typeof recalcShotStatus>[1];
const asTx = (c: { shotState: unknown }): NonNullable<TxArg> =>
  c as unknown as NonNullable<TxArg>;

function fakeClient(shot: {
  id: string;
  shotApprovalStatus: ShotApprovalStatus;
  sharedWithClient: boolean;
  status?: string;
  tasks: FakeTask[];
  versions?: FakeVersion[];
}) {
  const versions = shot.versions ?? [];
  return {
    shot: {
      findUnique: async () => shot,
      update: async ({ data }: { data: Record<string, unknown> }) => {
        Object.assign(shot, data);
        return shot;
      },
    },
    task: {
      findMany: async ({ where }: { where: { status?: { not: TaskStatus } } }) =>
        where.status?.not
          ? shot.tasks.filter((t) => t.status !== where.status!.not)
          : shot.tasks,
      update: async ({ where, data }: { where: { id: string }; data: { status: TaskStatus } }) => {
        const t = shot.tasks.find((x) => x.id === where.id);
        if (t) t.status = data.status;
        return t;
      },
      updateMany: async ({
        where,
        data,
      }: {
        where: { status?: { not: TaskStatus } };
        data: { status: TaskStatus };
      }) => {
        for (const t of shot.tasks) {
          if (!where.status?.not || t.status !== where.status.not) t.status = data.status;
        }
        return { count: shot.tasks.length };
      },
    },
    version: {
      findFirst: async () =>
        [...versions].sort(
          (a, b) =>
            Number(b.isLatest) - Number(a.isLatest) ||
            b.createdAt.getTime() - a.createdAt.getTime()
        )[0] ?? null,
    },
    shotState: shot,
  };
}

describe("clearStaleShotApproval", () => {
  it("clears an internal sign-off so new work is visible", async () => {
    const c = fakeClient({
      id: "s1",
      shotApprovalStatus: "INTERNALLY_APPROVED",
      sharedWithClient: false,
      tasks: [{ id: "t1", status: "INTERNAL_REVIEW" }],
    });
    expect(await clearStaleShotApproval(asTx(c), "s1")).toBe(true);
    expect(c.shotState.shotApprovalStatus).toBe("PENDING");
  });

  it("clears a client sign-off, so an upload cannot hide under COMPLETE", async () => {
    const c = fakeClient({
      id: "s1",
      shotApprovalStatus: "CLIENT_APPROVED",
      sharedWithClient: true,
      tasks: [{ id: "t1", status: "INTERNAL_REVIEW" }],
    });
    expect(await clearStaleShotApproval(asTx(c), "s1")).toBe(true);
    expect(c.shotState.shotApprovalStatus).toBe("PENDING");
  });

  it("is a no-op when there is no sign-off to clear", async () => {
    const c = fakeClient({
      id: "s1",
      shotApprovalStatus: "PENDING",
      sharedWithClient: false,
      tasks: [{ id: "t1", status: "IN_PROGRESS" }],
    });
    expect(await clearStaleShotApproval(asTx(c), "s1")).toBe(false);
  });

  it("leaves sharedWithClient alone — revoking access is a separate act", async () => {
    const c = fakeClient({
      id: "s1",
      shotApprovalStatus: "CLIENT_APPROVED",
      sharedWithClient: true,
      tasks: [{ id: "t1", status: "DONE" }],
    });
    await clearStaleShotApproval(asTx(c), "s1");
    expect(c.shotState.sharedWithClient).toBe(true);
  });
});

describe("markShotForRevisions", () => {
  it("marks the open tasks and lands the shot on REVISIONS", async () => {
    const c = fakeClient({
      id: "s1",
      shotApprovalStatus: "CLIENT_APPROVED",
      sharedWithClient: true,
      tasks: [
        { id: "t1", status: "DONE" },
        { id: "t2", status: "IN_PROGRESS" },
      ],
    });
    const changed = await markShotForRevisions(asTx(c), "s1");
    expect(changed).toEqual(["t2"]);
    expect(c.shotState.tasks.find((t) => t.id === "t1")!.status).toBe("DONE");
    expect(c.shotState.tasks.find((t) => t.id === "t2")!.status).toBe("CHANGES");
    expect(c.shotState.shotApprovalStatus).toBe("PENDING");
    expect(c.shotState.sharedWithClient).toBe(false);
    expect(c.shotState.status).toBe("REVISIONS");
  });

  // The regression this helper exists for: a shot out for client review has all
  // its tasks DONE, so the old "non-DONE" filter matched nothing and the change
  // request silently derived to INTERNAL_REVIEW instead of REVISIONS.
  it("reopens the task behind the latest version when every task is DONE", async () => {
    const c = fakeClient({
      id: "s1",
      shotApprovalStatus: "CLIENT_APPROVED",
      sharedWithClient: true,
      tasks: [
        { id: "t1", status: "DONE" },
        { id: "t2", status: "DONE" },
      ],
      versions: [
        { id: "v1", taskId: "t1", isLatest: false, createdAt: new Date("2026-01-01") },
        { id: "v2", taskId: "t2", isLatest: true, createdAt: new Date("2026-02-01") },
      ],
    });
    const changed = await markShotForRevisions(asTx(c), "s1");
    expect(changed).toEqual(["t2"]);
    expect(c.shotState.tasks.find((t) => t.id === "t2")!.status).toBe("CHANGES");
    expect(c.shotState.status).toBe("REVISIONS");
  });

  it("marks only the called-out task when one is named", async () => {
    const c = fakeClient({
      id: "s1",
      shotApprovalStatus: "INTERNALLY_APPROVED",
      sharedWithClient: false,
      tasks: [
        { id: "t1", status: "TODO" },
        { id: "t2", status: "DONE" },
      ],
    });
    const changed = await markShotForRevisions(asTx(c), "s1", "t2");
    expect(changed).toEqual(["t2"]);
    expect(c.shotState.tasks.find((t) => t.id === "t1")!.status).toBe("TODO");
    expect(c.shotState.tasks.find((t) => t.id === "t2")!.status).toBe("CHANGES");
  });

  it("still clears the approval when a shot has no tasks to mark", async () => {
    const c = fakeClient({
      id: "s1",
      shotApprovalStatus: "CLIENT_APPROVED",
      sharedWithClient: true,
      tasks: [],
    });
    const changed = await markShotForRevisions(asTx(c), "s1");
    expect(changed).toEqual([]);
    expect(c.shotState.shotApprovalStatus).toBe("PENDING");
    expect(c.shotState.status).toBe("WAITING");
  });
});