/**
 * v0.53 - Empty Done Orchestration Regression Test
 *
 * Proves that handleDoneForNowPromotion's gate is based on active-target
 * focused contributions, NOT on scenario-wide findings.
 *
 * Deterministic: exercises the exact ownership condition logic extracted
 * from the component boundary. No rendering, no fetch.
 */

import { describe, expect, it } from "vitest";
import { reopenResolvedUnknown } from "@/lib/graph/reopen-resolved-unknown.js";

/* - Extracted gate logic (mirrors scenario-form.jsx line ~362) -- */

function shouldEnterEpisodePath(targetNodeId, focusedContributions) {
  if (!targetNodeId) return false;
  const hasActiveTargetContent = (focusedContributions ?? []).some(
    (c) => c.targetNodeId === targetNodeId || c.originatingTargetNodeId === targetNodeId,
  );
  return hasActiveTargetContent;
}

/* - Case A - empty active target -- */

describe("empty active target", () => {
  it("returns false when focusedContributions contains no contribution owned by the target", () => {
    const result = shouldEnterEpisodePath(
      "node-B",
      [
        { id: "contrib-0001", targetNodeId: "node-A", originatingTargetNodeId: "node-A" },
        { id: "contrib-0002", targetNodeId: "node-A", originatingTargetNodeId: "node-A" },
      ],
    );
    expect(result).toBe(false);
  });

  it("returns false when focusedContributions is empty array", () => {
    const result = shouldEnterEpisodePath("node-B", []);
    expect(result).toBe(false);
  });

  it("returns false when focusedContributions is undefined/null", () => {
    expect(shouldEnterEpisodePath("node-B", undefined)).toBe(false);
    expect(shouldEnterEpisodePath("node-B", null)).toBe(false);
  });

  it("returns false when targetNodeId is empty string", () => {
    const result = shouldEnterEpisodePath("", [{ id: "contrib-0001", targetNodeId: "node-A" }]);
    expect(result).toBe(false);
  });

  it("returns false when targetNodeId is null", () => {
    const result = shouldEnterEpisodePath(null, [{ id: "contrib-0001", targetNodeId: "node-A" }]);
    expect(result).toBe(false);
  });

  it("originatingTargetNodeId ownership also gates correctly - mismatched origin", () => {
    const result = shouldEnterEpisodePath(
      "node-B",
      [{ id: "contrib-0001", targetNodeId: "node-A", originatingTargetNodeId: "node-C" }],
    );
    expect(result).toBe(false);
  });
});

/* - Case A2 — immediate Done produces canonical parked state (graph coherence) -- */

function simulateImmediateDone(graph, nodeId) {
  /* Mirrors the onImmediateGraphChange logic in FocusedWorkspaceNavigation */
  const resolvedIds = new Set(graph.resolvedNodeIds || []);
  resolvedIds.add(nodeId);
  const nextNodes = (graph.nodes || []).map((n) =>
    n.id === nodeId ? { ...n, status: "resolved" } : n,
  );
  return {
    ...graph,
    nodes: nextNodes,
    resolvedNodeIds: Array.from(resolvedIds),
  };
}

describe("immediate Done produces canonical parked state", () => {
  it("sets node.status to resolved and adds ID to resolvedNodeIds for empty-Done target", () => {
    const graph = {
      nodes: [{ id: "node-empty", kind: "unknown", status: "unknown" }],
      resolvedNodeIds: [],
    };

    const nextGraph = simulateImmediateDone(graph, "node-empty");

    const targetNode = nextGraph.nodes.find((n) => n.id === "node-empty");
    expect(targetNode.status).toBe("resolved");
    expect(nextGraph.resolvedNodeIds).toContain("node-empty");
  });

  it("preserves other nodes unchanged", () => {
    const graph = {
      nodes: [
        { id: "node-A", kind: "unknown", status: "unknown" },
        { id: "node-B", kind: "unknown", status: "unknown" },
      ],
      resolvedNodeIds: [],
    };

    const nextGraph = simulateImmediateDone(graph, "node-B");

    const nodeA = nextGraph.nodes.find((n) => n.id === "node-A");
    expect(nodeA.status).toBe("unknown");
  });

  it("is idempotent for resolvedNodeIds — duplicate add does not create duplicates", () => {
    const graph = {
      nodes: [{ id: "node-X", kind: "unknown", status: "resolved" }],
      resolvedNodeIds: ["node-X"],
    };

    const nextGraph = simulateImmediateDone(graph, "node-X");

    expect(nextGraph.resolvedNodeIds.filter((id) => id === "node-X").length).toBe(1);
  });
});

/* - Case B - populated active target (regression guard) -- */

describe("populated active target", () => {
  it("returns true when a contribution's targetNodeId matches", () => {
    const result = shouldEnterEpisodePath(
      "node-B",
      [
        { id: "contrib-0001", targetNodeId: "node-A" },
        { id: "contrib-0002", targetNodeId: "node-B" },
      ],
    );
    expect(result).toBe(true);
  });

  it("returns true when a contribution's originatingTargetNodeId matches", () => {
    const result = shouldEnterEpisodePath(
      "node-B",
      [
        { id: "contrib-0001", targetNodeId: "node-A" },
        { id: "contrib-0002", originatingTargetNodeId: "node-B", targetNodeId: "node-B" },
      ],
    );
    expect(result).toBe(true);
  });

  it("returns true with a single contribution owned by the target", () => {
    const result = shouldEnterEpisodePath("node-B", [
      { id: "contrib-0001", targetNodeId: "node-B" },
    ]);
    expect(result).toBe(true);
  });

  it("returns true when contributions exist for the target even if others are also present", () => {
    const result = shouldEnterEpisodePath(
      "node-B",
      [
        { id: "contrib-0001", targetNodeId: "node-A" },
        { id: "contrib-0002", originatingTargetNodeId: "node-B" },
        { id: "contrib-0003", targetNodeId: "node-C" },
      ],
    );
    expect(result).toBe(true);
  });
});

/* - Integration: scenario-wide findings must not leak through -- */

describe("scenario-wide evidence does not influence gate", () => {
  it("findings for other questions do not cause empty target to enter episode path", () => {
    // Even if there are many findings elsewhere, the empty target (node-B)
    // must NOT enter episode processing.
    const focusedContributions = [
      { id: "contrib-0001", targetNodeId: "node-A", originatingTargetNodeId: "node-A" },
      { id: "contrib-0002", targetNodeId: "node-A", originatingTargetNodeId: "node-A" },
      { id: "contrib-0003", targetNodeId: "node-A", originatingTargetNodeId: "node-A" },
    ];

    // node-B has zero focused contributions - should NOT enter episode path
    expect(shouldEnterEpisodePath("node-B", focusedContributions)).toBe(false);

    // node-A has contributions - should enter episode path (existing behavior preserved)
    expect(shouldEnterEpisodePath("node-A", focusedContributions)).toBe(true);
  });
});

/* - Case B2 — Re-open reverses canonical + local parking state -- */

describe("Re-open reverses canonical graph state", () => {
  it("changes node.status from resolved back to unknown", () => {
    const graph = {
      nodes: [
        { id: "node-parked", kind: "unknown", status: "resolved" },
        { id: "node-other", kind: "unknown", status: "unknown" },
      ],
      resolvedNodeIds: ["node-parked"],
    };

    const nextGraph = reopenResolvedUnknown(graph, "node-parked");

    const targetNode = nextGraph.nodes.find((n) => n.id === "node-parked");
    expect(targetNode.status).toBe("unknown");
  });

  it("removes target from resolvedNodeIds", () => {
    const graph = {
      nodes: [{ id: "node-parked", kind: "unknown", status: "resolved" }],
      resolvedNodeIds: ["node-parked"],
    };

    const nextGraph = reopenResolvedUnknown(graph, "node-parked");

    expect(nextGraph.resolvedNodeIds).not.toContain("node-parked");
  });

  it("preserves other resolved nodes", () => {
    const graph = {
      nodes: [
        { id: "node-A", kind: "unknown", status: "resolved" },
        { id: "node-B", kind: "unknown", status: "resolved" },
        { id: "node-C", kind: "unknown", status: "unknown" },
      ],
      resolvedNodeIds: ["node-A", "node-B"],
    };

    const nextGraph = reopenResolvedUnknown(graph, "node-A");

    expect(nextGraph.resolvedNodeIds).toContain("node-B");
    expect(nextGraph.resolvedNodeIds).not.toContain("node-A");
  });

  it("returns original graph when node is not a resolved unknown", () => {
    const graph = {
      nodes: [{ id: "node-unknown", kind: "unknown", status: "unknown" }],
      resolvedNodeIds: [],
    };

    const nextGraph = reopenResolvedUnknown(graph, "node-unknown");

    expect(nextGraph).toBe(graph);
  });

  it("returns original graph when node is not an unknown kind", () => {
    const graph = {
      nodes: [{ id: "node-assumption", kind: "assumption", status: "resolved" }],
      resolvedNodeIds: ["node-assumption"],
    };

    const nextGraph = reopenResolvedUnknown(graph, "node-assumption");

    expect(nextGraph).toBe(graph);
  });

  it("local setDoneForNowIds cleanup removes only the reopened target", () => {
    const prevDoneIds = ["node-A", "node-parked", "node-C"];
    const nextDoneIds = prevDoneIds.filter((id) => id !== "node-parked");
    expect(nextDoneIds).toContain("node-A");
    expect(nextDoneIds).toContain("node-C");
    expect(nextDoneIds).not.toContain("node-parked");
  });

  it("local setDoneForNowIds is no-op when target not in array", () => {
    const prevDoneIds = ["node-A", "node-B"];
    const nextDoneIds = prevDoneIds.filter((id) => id !== "node-parked");
    expect(nextDoneIds).toEqual(prevDoneIds);
  });
});

/* - Case C — history preservation (graph structure invariance) -- */

describe("Re-open preserves contributions and findings", () => {
  it("does not create or delete nodes", () => {
    const originalNodes = [
      { id: "node-parked", kind: "unknown", status: "resolved" },
      { id: "node-A", kind: "assumption", status: "resolved" },
    ];
    const graph = {
      nodes: originalNodes,
      resolvedNodeIds: ["node-parked"],
    };

    const nextGraph = reopenResolvedUnknown(graph, "node-parked");

    expect(nextGraph.nodes.length).toBe(originalNodes.length);
  });

  it("does not create or delete edges", () => {
    const graph = {
      nodes: [{ id: "node-parked", kind: "unknown", status: "resolved" }],
      resolvedNodeIds: ["node-parked"],
      edges: [
        { from: "node-parked", to: "node-A", type: "supports" },
        { from: "node-B", to: "node-parked", type: "refutes" },
      ],
    };

    const nextGraph = reopenResolvedUnknown(graph, "node-parked");

    expect(nextGraph.edges.length).toBe(2);
  });
});