/**
 * Progressed investigation fixture apparatus verification.
 *
 * Proves that the canonical progressed-investigation fixture:
 *   1. loads successfully as valid JSON
 *   2. contains >= 1 admitted known/supported evidence item
 *   3. contains >= 1 unresolved Open Question (kind=unknown, status=unknown)
 *   4. the unresolved Open Question is not admitted evidence
 *   5. at least one eligible Finding exists (null disposition)
 *   6. unresolved Open Question is not represented as an eligible Finding
 *   7. resolvedNodeIds does NOT include any unknown node id
 */

import { describe, it, expect } from "vitest";
import fixture from "../fixtures/progressed-investigation-manufacturing.json";

describe("Progressed investigation fixture apparatus", () => {
  /* ── 1. Fixture loads successfully ─────────────────── */

  it("loads as valid JSON with required top-level keys", () => {
    expect(fixture).toHaveProperty("success", true);
    expect(fixture).toHaveProperty("stage", "update_applied");
    expect(fixture).toHaveProperty("situationGraph");
    expect(fixture.situationGraph).toHaveProperty("nodes");
    expect(fixture.situationGraph).toHaveProperty("edges");
    expect(fixture.situationGraph).toHaveProperty("activeUnknownNodeId");
    expect(fixture.situationGraph).toHaveProperty("resolvedNodeIds");
    expect(fixture.situationGraph).toHaveProperty("centralStatement");
  });

  /* ── 2. Contains admitted evidence (>= 1 supported/known node) ─── */

  it("contains at least one admitted known or supported evidence node", () => {
    const admitted = fixture.situationGraph.nodes.filter(
      (n) => n.status === "supported" || n.status === "known"
    );
    expect(admitted.length).toBeGreaterThan(0);
  });

  it("admitted nodes are not unknown kind", () => {
    const admitted = fixture.situationGraph.nodes.filter(
      (n) => ["supported", "known"].includes(n.status)
    );
    for (const node of admitted) {
      expect(node.kind).not.toBe("unknown");
    }
  });

  /* ── 3. Contains unresolved Open Question (>= 1) ─────── */

  it("contains at least one unresolved Open Question node", () => {
    const unresolved = fixture.situationGraph.nodes.filter(
      (n) => n.kind === "unknown" && n.status === "unknown"
    );
    expect(unresolved.length).toBeGreaterThan(0);
  });

  /* ── 4. Unresolved Open Question is not admitted evidence ─── */

  it("no node is simultaneously unresolved unknown AND admitted evidence", () => {
    const allNodes = fixture.situationGraph.nodes;
    for (const node of allNodes) {
      if (node.kind === "unknown" && node.status === "unknown") {
        // An unresolved unknown must not have admitted status
        expect(["supported", "known"]).not.toContain(node.status);
      }
    }
  });

  it("unresolved and admitted node ID sets are disjoint", () => {
    const unresolvedIds = new Set(
      fixture.situationGraph.nodes
        .filter((n) => n.kind === "unknown" && n.status === "unknown")
        .map((n) => n.id)
    );
    const admittedIds = new Set(
      fixture.situationGraph.nodes
        .filter((n) => ["supported", "known"].includes(n.status))
        .map((n) => n.id)
    );
    for (const id of unresolvedIds) {
      expect(admittedIds.has(id)).toBe(false);
    }
  });

  it("unresolved unknown nodes are distinct from admitted evidence", () => {
    const unresolvedIds = new Set(
      fixture.situationGraph.nodes
        .filter((n) => n.kind === "unknown" && n.status === "unknown")
        .map((n) => n.id)
    );
    const admittedIds = new Set(
      fixture.situationGraph.nodes
        .filter((n) => ["supported", "known"].includes(n.status))
        .map((n) => n.id)
    );
    for (const id of unresolvedIds) {
      expect(admittedIds.has(id)).toBe(false);
    }
  });

  /* ── 5. Unresolved question excluded from resolvedNodeIds ─── */

  it("resolvedNodeIds does not contain any unresolved unknown node id", () => {
    const unresolvedIds = fixture.situationGraph.nodes
      .filter((n) => n.kind === "unknown" && n.status === "unknown")
      .map((n) => n.id);
    for (const nodeId of unresolvedIds) {
      expect(fixture.situationGraph.resolvedNodeIds).not.toContain(nodeId);
    }
  });

  /* ── 6. Eligible Finding exists ─────────────────────── */

  it("findings array exists and has eligible items", () => {
    expect(fixture.findings).toBeDefined();
    expect(Array.isArray(fixture.findings)).toBe(true);
    const eligible = fixture.findings.filter(
      (f) => f.status === "provisional" && f.userDisposition === null
    );
    expect(eligible.length).toBeGreaterThan(0);
  });

  /* ── 7. Unresolved Open Question is not represented as a Finding ─── */

  it("unresolved unknown nodes are not mapped to findings propositions", () => {
    const unresolvedNodeIds = new Set(
      fixture.situationGraph.nodes
        .filter((n) => n.kind === "unknown" && n.status === "unknown")
        .map((n) => n.id)
    );
    // originTargetNodeId links findings to unknown nodes
    // A finding whose originatingTargetNodeId is an unresolved unknown is fine
    // but the proposition should not BE the same as the node label
    const eligibleFindings = fixture.findings.filter(
      (f) => f.status === "provisional" && f.userDisposition === null
    );
    const unresolvedNodes = fixture.situationGraph.nodes.filter(
      (n) => n.kind === "unknown" && n.status === "unknown"
    );

    for (const finding of eligibleFindings) {
      // The proposition is an admitted evidence item, not the unknown itself
      expect(finding.proposition).not.toContain("Whether");
      // Verify the originating node is NOT resolved — it remains open
      const targetNode = unresolvedNodes.find(
        (n) => n.id === finding.originatingTargetNodeId
      );
      if (targetNode) {
        expect(targetNode.status).toBe("unknown");
        expect(targetNode.kind).toBe("unknown");
      }
    }
  });

  /* ── 8. Canonical shape integrity ──────────────────── */

  it("activeUnknownNodeId references a valid unresolved unknown node", () => {
    const unresolvedIds = fixture.situationGraph.nodes
      .filter((n) => n.kind === "unknown" && n.status === "unknown")
      .map((n) => n.id);
    expect(unresolvedIds).toContain(fixture.situationGraph.activeUnknownNodeId);
  });

  it("all nodes pass the canonical situationNode schema invariants", () => {
    for (const node of fixture.situationGraph.nodes) {
      expect(node).toHaveProperty("id");
      expect(node).toHaveProperty("label");
      expect(node).toHaveProperty("description");
      expect(["observation","reported_claim","metric","state","transition","relationship","assumption","unknown","conclusion","option"]).toContain(node.kind);
      expect(["known","unknown","provisional","supported","weakened","contradicted","resolved"]).toContain(node.status);
      expect(["low","medium","high"]).toContain(node.confidence);
      expect(Array.isArray(node.evidenceIds)).toBe(true);
      expect(Array.isArray(node.dependsOn)).toBe(true);
      expect(Array.isArray(node.affects)).toBe(true);
    }
  });

  it("all edges reference valid nodes", () => {
    const nodeIds = new Set(fixture.situationGraph.nodes.map((n) => n.id));
    for (const edge of fixture.situationGraph.edges) {
      expect(edge).toHaveProperty("id");
      expect(nodeIds.has(edge.fromNodeId)).toBe(true);
      expect(nodeIds.has(edge.toNodeId)).toBe(true);
      expect(edge).toHaveProperty("relationship");
      expect(edge).toHaveProperty("confidence");
    }
  });
});