import { describe, expect, it } from "vitest";
import { parseGraphUpdateProposal } from "@/lib/graph/update-proposal.js";

function makeValidProposal(overrides = {}) {
  return {
    addedNodes: [],
    updatedNodes: [
      {
        nodeId: "n-unknown",
        previousStatus: "unknown",
        newStatus: "resolved",
        previousValue: null,
        newValue: "1.9 complaints per 100 units",
        reason: "The answer directly provides the normalized complaint rate.",
      },
    ],
    addedEdges: [],
    removedEdgeIds: [],
    resolvedUnknownNodeIds: ["n-unknown"],
    affectedNodeIds: [],
    selectedQuestion: null,
    ...overrides,
  };
}

describe("parseGraphUpdateProposal", () => {
  it("parses a valid proposal", () => {
    const result = parseGraphUpdateProposal(makeValidProposal());
    expect(result.success).toBe(true);
    expect(result.proposal.updatedNodes).toHaveLength(1);
  });

  it("fails on malformed JSON", () => {
    const result = parseGraphUpdateProposal("{not json");
    expect(result.success).toBe(false);
  });

  it("fails when required update content is invalid", () => {
    const result = parseGraphUpdateProposal({
      updatedNodes: [{ nodeId: "n-unknown" }],
    });
    expect(result.success).toBe(false);
  });

  it("removes null array entries and logs them", () => {
    const result = parseGraphUpdateProposal(
      JSON.stringify({
        ...makeValidProposal(),
        addedNodes: [null],
      }),
    );
    expect(result.success).toBe(true);
    expect(result.proposal.addedNodes).toEqual([]);
    expect(result.normalisationsApplied).toEqual(
      expect.arrayContaining([
        expect.objectContaining({ change: "Removed null array entry" }),
      ]),
    );
  });

  it("fills missing optional arrays with empty arrays", () => {
    const result = parseGraphUpdateProposal({
      updatedNodes: [],
    });
    expect(result.success).toBe(true);
    expect(result.proposal.addedNodes).toEqual([]);
    expect(result.proposal.addedEdges).toEqual([]);
    expect(result.normalisationsApplied.length).toBeGreaterThan(0);
  });

  it("normalises confirmed enum alias and preserves IDs", () => {
    const result = parseGraphUpdateProposal({
      ...makeValidProposal(),
      addedNodes: [
        {
          id: "n-new",
          label: "Reported update",
          description: "A new reported claim",
          kind: "reported_statement",
          status: "supported",
          confidence: "medium",
          value: null,
          unit: null,
          evidenceIds: [],
          dependsOn: [],
          affects: [],
          parentId: null,
          childIds: [],
        },
      ],
    });
    expect(result.success).toBe(true);
    expect(result.proposal.addedNodes[0].kind).toBe("reported_claim");
    expect(result.proposal.addedNodes[0].id).toBe("n-new");
  });

  it("unknown enum values still fail", () => {
    const result = parseGraphUpdateProposal({
      ...makeValidProposal(),
      addedNodes: [
        {
          id: "n-new",
          label: "Bad node",
          description: "Bad node",
          kind: "unsupported_kind",
          status: "supported",
          confidence: "medium",
          value: null,
          unit: null,
          evidenceIds: [],
          dependsOn: [],
          affects: [],
          parentId: null,
          childIds: [],
        },
      ],
    });
    expect(result.success).toBe(false);
  });

  it("defaults missing selectedQuestion to null", () => {
    const result = parseGraphUpdateProposal({
      addedNodes: [],
      updatedNodes: [],
      addedEdges: [],
      removedEdgeIds: [],
      resolvedUnknownNodeIds: [],
      affectedNodeIds: [],
    });
    expect(result.success).toBe(true);
    expect(result.proposal.selectedQuestion).toBeNull();
  });

  it("parses a valid selectedQuestion", () => {
    const result = parseGraphUpdateProposal(
      makeValidProposal({
        selectedQuestion: {
          nodeId: "n-follow-up",
          question: "How should commercial value be defined for this decision?",
          reason: "A consequential unknown remains unresolved.",
        },
      }),
    );
    expect(result.success).toBe(true);
    expect(result.proposal.selectedQuestion?.nodeId).toBe("n-follow-up");
  });

  it("does not invent a next question field outside the contract", () => {
    const result = parseGraphUpdateProposal(makeValidProposal());
    expect(result.proposal.nextQuestion).toBeUndefined();
  });
});