/**
 * @file Unit tests for pipeline templates and durable lane storage helpers,
 * including lifecycle transitions, recovery, liveness, and worktree metadata.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const os = require("node:os");
const pathMod = require("node:path");
// Every test in this file must hit THIS database. Migration tests below
// re-point DASHBOARD_DB_PATH at a throwaway file; their cleanup must restore
// this value rather than delete it - an unset DASHBOARD_DB_PATH resolves to the
// operator's REAL dashboard DB, so a later test would read and write live data.
const SUITE_DB_PATH = pathMod.join(
  os.tmpdir(),
  `dashboard-lanes-lib-${Date.now()}-${process.pid}.db`
);
process.env.DASHBOARD_DB_PATH = SUITE_DB_PATH;

const { describe, it } = require("node:test");
const assert = require("node:assert/strict");

const {
  DEFAULT_PIPELINE_ID,
  getPipeline,
  listPipelines,
  phaseIdx,
  nodeStates,
  progressPct,
} = require("../lib/pipelines");

describe("pipelines", () => {
  it("exposes a default template and falls back to it for unknown ids", () => {
    const def = getPipeline(DEFAULT_PIPELINE_ID);
    assert.ok(def.nodes.length > 3);
    assert.equal(getPipeline("does-not-exist").id, DEFAULT_PIPELINE_ID);
    assert.ok(listPipelines().some((p) => p.id === DEFAULT_PIPELINE_ID));
  });

  it("resolves a stage through node id and through aliases", () => {
    const p = getPipeline(DEFAULT_PIPELINE_ID);
    assert.equal(
      phaseIdx(p, "plan"),
      p.nodes.findIndex((n) => n.id === "plan")
    );
    assert.equal(phaseIdx(p, "planning"), phaseIdx(p, "plan"));
    assert.equal(phaseIdx(p, "totally-unknown-stage"), -1);
  });

  it("marks the current stage current, recorded-with-evidence done, recorded-without amber", () => {
    const p = getPipeline(DEFAULT_PIPELINE_ID);
    const lane = {
      stage: "review",
      stages: {
        plan: { enteredAt: "2026-07-27T00:00:00Z", evidence: "docs/plan.md" },
        implement: { enteredAt: "2026-07-27T01:00:00Z", evidence: null },
        review: { enteredAt: "2026-07-27T02:00:00Z", evidence: null },
      },
    };
    const byId = Object.fromEntries(nodeStates(p, lane).map((n) => [n.id, n.state]));
    assert.equal(byId.plan, "done");
    assert.equal(byId.implement, "passed-no-evidence");
    assert.equal(byId.review, "current");
    assert.equal(byId.done, "pending");
  });

  it("marks a failed stage failed even when it is the current stage", () => {
    const p = getPipeline(DEFAULT_PIPELINE_ID);
    const lane = { stage: "gate", stages: { gate: { enteredAt: "x", result: "fail" } } };
    const byId = Object.fromEntries(nodeStates(p, lane).map((n) => [n.id, n.state]));
    assert.equal(byId.gate, "failed");
  });

  it("treats skipped earlier nodes as passed-without-evidence, not done", () => {
    const p = getPipeline(DEFAULT_PIPELINE_ID);
    const lane = { stage: "review", stages: { review: { enteredAt: "x" } } };
    const byId = Object.fromEntries(nodeStates(p, lane).map((n) => [n.id, n.state]));
    assert.equal(byId.plan, "passed-no-evidence");
  });

  it("keeps the evidence of a stage declared under an alias", () => {
    // `lane.stages` is keyed by the raw declared string, so `ccam stage
    // planning --evidence x` files the record under "planning" while the node
    // is "plan". Looking it up by node id alone loses the evidence and paints
    // a `done` node amber — silently, and only for agents that use an alias.
    const p = getPipeline(DEFAULT_PIPELINE_ID);
    const lane = {
      stage: "review",
      stages: { planning: { enteredAt: "2026-07-27T00:00:00Z", evidence: "docs/plan.md" } },
    };
    const byId = Object.fromEntries(nodeStates(p, lane).map((n) => [n.id, n.state]));
    assert.equal(byId.plan, "done");
  });

  it("prefers a node-id record over an alias record for the same node", () => {
    const p = getPipeline(DEFAULT_PIPELINE_ID);
    const lane = {
      stage: "review",
      stages: {
        planning: { enteredAt: "2026-07-27T00:00:00Z", evidence: null },
        plan: { enteredAt: "2026-07-27T00:30:00Z", evidence: "docs/plan.md" },
      },
    };
    const byId = Object.fromEntries(nodeStates(p, lane).map((n) => [n.id, n.state]));
    assert.equal(byId.plan, "done");
  });

  it("ignores a recorded stage matching no node instead of shifting the others", () => {
    const p = getPipeline(DEFAULT_PIPELINE_ID);
    const lane = {
      stage: "review",
      stages: { "totally-unknown": { enteredAt: "x", evidence: "y" } },
    };
    const byId = Object.fromEntries(nodeStates(p, lane).map((n) => [n.id, n.state]));
    assert.equal(byId.plan, "passed-no-evidence");
    assert.equal(byId.review, "current");
  });

  it("computes progress from node position, 0 for an unknown stage", () => {
    const p = getPipeline(DEFAULT_PIPELINE_ID);
    assert.equal(progressPct(p, { stage: p.nodes[0].id, stages: {} }), 0);
    assert.equal(progressPct(p, { stage: p.nodes[p.nodes.length - 1].id, stages: {} }), 100);
    assert.equal(progressPct(p, { stage: "nope", stages: {} }), 0);
  });
});

const lanes = require("../lib/lanes");
const features = require("../lib/lane-features");

describe("lanes lib", () => {
  it("creates, lists, updates and deletes a lane", () => {
    const l = lanes.createLane({ title: "Feature A", cwd: "/tmp/wt/a", branch: "feat/a" });
    assert.equal(l.title, "Feature A");
    assert.equal(l.stage, "idle");
    assert.equal(lanes.getLane(l.id).cwd, "/tmp/wt/a");
    assert.ok(lanes.listLanes().length >= 1);
    assert.equal(lanes.updateLane(l.id, { ci_status: "green" }).ci_status, "green");
    assert.equal(lanes.deleteLane(l.id), true);
    assert.equal(lanes.getLane(l.id), null);
  });

  it("recovers only provisioning lanes interrupted by a restart", () => {
    const provisioning = lanes.createLane({
      cwd: "/tmp/wt/provisioning-recovery",
      branch: "feat/provisioning-recovery",
      kind: "managed",
    });
    lanes.updateLane(provisioning.id, { status: "provisioning" });
    const idle = lanes.createLane({ cwd: "/tmp/wt/idle-recovery", branch: "feat/idle-recovery" });
    const failed = lanes.createLane({
      cwd: "/tmp/wt/failed-recovery",
      branch: "feat/failed-recovery",
    });
    lanes.updateLane(failed.id, { status: "failed", notes: "existing failure" });

    assert.equal(lanes.recoverInterruptedProvisioning(), 1);

    const recovered = lanes.getLane(provisioning.id);
    assert.equal(recovered.status, "failed");
    assert.equal(recovered.notes, "Provisioning was interrupted by a server restart.");
    assert.equal(recovered.kind, "managed");
    assert.equal(recovered.cwd, "/tmp/wt/provisioning-recovery");
    assert.equal(recovered.branch, "feat/provisioning-recovery");
    assert.equal(lanes.getLane(idle.id).status, "idle");
    assert.equal(lanes.getLane(failed.id).status, "failed");
    assert.equal(lanes.getLane(failed.id).notes, "existing failure");

    lanes.deleteLane(provisioning.id);
    lanes.deleteLane(idle.id);
    lanes.deleteLane(failed.id);
  });

  it("bumps stage_since only when the stage actually changes", async () => {
    const l = lanes.createLane({ cwd: "/tmp/wt/b" });
    const a = lanes.setStage(l.id, { stage: "plan" });
    await new Promise((r) => setTimeout(r, 1100));
    const b = lanes.setStage(l.id, { stage: "plan", note: "still planning" });
    assert.equal(a.stage_since, b.stage_since);
    const c = lanes.setStage(l.id, { stage: "implement" });
    assert.notEqual(c.stage_since, b.stage_since);
    lanes.deleteLane(l.id);
  });

  it("records evidence per stage so the map can tell done from amber", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt/c" });
    lanes.setStage(l.id, { stage: "plan", evidence: "docs/plan.md" });
    const after = lanes.setStage(l.id, { stage: "implement" });
    assert.equal(after.stages.plan.evidence, "docs/plan.md");
    assert.ok(after.stages.plan.enteredAt);
    lanes.deleteLane(l.id);
  });

  it("resolves a lane from a session cwd by longest path-boundary prefix", () => {
    const outer = lanes.createLane({ cwd: "/tmp/wt" });
    const inner = lanes.createLane({ cwd: "/tmp/wt/inner" });
    assert.equal(lanes.resolveLaneByCwd("/tmp/wt/inner/src").id, inner.id);
    assert.equal(lanes.resolveLaneByCwd("/tmp/wt/other").id, outer.id);
    assert.equal(lanes.resolveLaneByCwd("/tmp/wt-sibling"), null);
    assert.equal(lanes.resolveLaneByCwd(null), null);
    lanes.deleteLane(inner.id);
    lanes.deleteLane(outer.id);
  });

  it("classifies liveness: silent watcher is dead, silent idle lane is not", () => {
    const d = 300;
    assert.equal(
      lanes.classifyLiveness({ status: "running", stage: "implement", ageSec: 10 }, d),
      "active"
    );
    assert.equal(
      lanes.classifyLiveness({ status: "running", stage: "implement", ageSec: 999 }, d),
      "dead"
    );
    assert.equal(
      lanes.classifyLiveness({ status: "idle", stage: "watching-pr", ageSec: 999 }, d),
      "dead"
    );
    assert.equal(
      lanes.classifyLiveness({ status: "idle", stage: "done", ageSec: 99999 }, d),
      "idle"
    );
    assert.equal(
      lanes.classifyLiveness({ status: "idle", stage: "done", ageSec: null }, d),
      "idle"
    );
  });

  it("payload carries node states and progress", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt/d" });
    lanes.setStage(l.id, { stage: "review" });
    const p = lanes.lanePayload(lanes.getLane(l.id), 5);
    assert.equal(p.pipeline_nodes.find((n) => n.id === "review").state, "current");
    assert.ok(p.progress > 0 && p.progress < 100);
    assert.equal(p.liveness, "idle");
    lanes.deleteLane(l.id);
  });
});

const { withLaneLock } = require("../lib/lane-lock");

describe("lane kind, worktree fields and purge", () => {
  it("defaults to adopted and stores worktree fields when given", () => {
    const a = lanes.createLane({ cwd: "/tmp/wt-kind-a" });
    assert.equal(a.kind, "adopted");
    const m = lanes.createLane({
      cwd: "/tmp/wt-kind-b",
      kind: "managed",
      source_repo: "/tmp/src",
      base_branch: "main",
      slug: "b",
    });
    assert.equal(m.kind, "managed");
    assert.equal(m.source_repo, "/tmp/src");
    assert.equal(m.base_branch, "main");
    assert.equal(m.slug, "b");
    lanes.deleteLane(a.id);
    lanes.deleteLane(m.id);
  });

  it("rejects an unknown kind", () => {
    assert.throws(
      () => lanes.createLane({ cwd: "/tmp/wt-kind-c", kind: "gremlin" }),
      (e) => e.code === "EBADKIND"
    );
  });

  it("purges a lane's sessions, their events and orphaned token rows, sparing the live one", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-purge" });
    const { db } = require("../db");
    db.prepare("INSERT INTO sessions (id, cwd, status) VALUES (?, ?, 'completed')").run(
      "purge-1",
      "/tmp/wt-purge/sub"
    );
    db.prepare("INSERT INTO sessions (id, cwd, status) VALUES (?, ?, 'active')").run(
      "purge-live",
      "/tmp/wt-purge"
    );
    db.prepare("INSERT INTO events (session_id, event_type) VALUES (?, 'PostToolUse')").run(
      "purge-1"
    );
    db.prepare("INSERT INTO token_usage (session_id, model, input_tokens) VALUES (?, 'm', 5)").run(
      "purge-1"
    );
    lanes.updateLane(l.id, { session_id: "purge-live" });

    const counts = lanes.purgeLaneSessions(l.id);
    assert.equal(counts.sessions, 1);
    assert.equal(counts.events, 1);
    assert.equal(counts.tokenRows, 1);
    assert.equal(db.prepare("SELECT COUNT(*) c FROM sessions WHERE id='purge-live'").get().c, 1);
    assert.equal(db.prepare("SELECT COUNT(*) c FROM events WHERE session_id='purge-1'").get().c, 0);
    assert.equal(
      db.prepare("SELECT COUNT(*) c FROM token_usage WHERE session_id='purge-1'").get().c,
      0
    );
    lanes.deleteLane(l.id);
  });

  it("never counts or deletes a sibling directory whose name differs only at an underscore", () => {
    // Every managed lane directory is named `<repo>__<slug>` — two literal
    // underscores, each of which LIKE treats as "any single character". Without
    // ESCAPE, a lane at /root/myrepo__feat-foo purged /root/myrepoXXfeat-foo's
    // sessions too, and the preflight count reported the victims, so the
    // confirmation was consistently wrong rather than detectably wrong.
    const { db } = require("../db");
    const laneCwd = "/root/myrepo__feat-foo";
    const siblingCwd = "/root/myrepoXXfeat-foo";
    const l = lanes.createLane({ cwd: laneCwd, kind: "managed" });

    db.prepare("INSERT INTO sessions (id, cwd, status) VALUES (?, ?, 'completed')").run(
      "like-mine",
      `${laneCwd}/sub`
    );
    db.prepare("INSERT INTO sessions (id, cwd, status) VALUES (?, ?, 'completed')").run(
      "like-victim",
      `${siblingCwd}/sub`
    );
    db.prepare("INSERT INTO sessions (id, cwd, status) VALUES (?, ?, 'active')").run(
      "like-victim-active",
      `${siblingCwd}/other`
    );
    db.prepare("INSERT INTO events (session_id, event_type) VALUES (?, 'Stop')").run("like-victim");

    // The counter sees only this lane's own session.
    const candidates = lanes.purgeCandidateSessions(lanes.getLane(l.id));
    assert.deepEqual(
      candidates.map((s) => s.id),
      ["like-mine"]
    );
    // ...and does not attribute the sibling's live session to this lane either.
    assert.equal(lanes.hasActiveLaneSession(lanes.getLane(l.id)), false);

    // The deleter agrees with the counter, exactly.
    const counts = lanes.purgeLaneSessions(l.id);
    assert.equal(counts.sessions, 1);
    assert.equal(counts.events, 0);
    assert.equal(db.prepare("SELECT COUNT(*) c FROM sessions WHERE id='like-victim'").get().c, 1);
    assert.equal(
      db.prepare("SELECT COUNT(*) c FROM sessions WHERE id='like-victim-active'").get().c,
      1
    );
    assert.equal(
      db.prepare("SELECT COUNT(*) c FROM events WHERE session_id='like-victim'").get().c,
      1
    );
    lanes.deleteLane(l.id);
  });

  it("a PATCH-style updateLane cannot change kind, source_repo, slug or base_branch", () => {
    // kind is check 1 of the destroy guard: a client that could flip it to
    // "managed" could point the guard at a directory the user owns.
    const l = lanes.createLane({
      cwd: "/tmp/wt-patch-guard",
      kind: "adopted",
      source_repo: "/tmp/original-src",
      base_branch: "main",
      slug: "original",
    });
    const after = lanes.updateLane(l.id, {
      kind: "managed",
      source_repo: "/tmp/attacker-src",
      base_branch: "attacker",
      slug: "attacker",
      title: "this one IS patchable",
    });
    assert.equal(after.kind, "adopted");
    assert.equal(after.source_repo, "/tmp/original-src");
    assert.equal(after.base_branch, "main");
    assert.equal(after.slug, "original");
    assert.equal(after.title, "this one IS patchable");

    // Provisioning has its own internal writer for those facts.
    const provisioned = lanes.setProvisioningFacts(l.id, { base_branch: "resolved-base" });
    assert.equal(provisioned.base_branch, "resolved-base");
    assert.equal(provisioned.kind, "adopted");
    lanes.deleteLane(l.id);
  });

  it("serialises work per lane and releases the lock when the body throws", async () => {
    const order = [];
    const slow = withLaneLock(7, async () => {
      order.push("a-start");
      await new Promise((r) => setTimeout(r, 50));
      order.push("a-end");
    });
    const fast = withLaneLock(7, async () => {
      order.push("b");
    });
    await Promise.all([slow, fast]);
    assert.deepEqual(order, ["a-start", "a-end", "b"]);
    await assert.rejects(() =>
      withLaneLock(7, async () => {
        throw new Error("boom");
      })
    );
    await withLaneLock(7, async () => order.push("c"));
    assert.equal(order[order.length - 1], "c");
  });

  it("updateLane rejects an unknown kind with EBADKIND and leaves stored value unchanged", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-kind-update", kind: "adopted" });
    assert.equal(l.kind, "adopted");
    assert.throws(
      () => lanes.updateLane(l.id, { kind: "MANAGED" }),
      (e) => e.code === "EBADKIND"
    );
    const after = lanes.getLane(l.id);
    assert.equal(after.kind, "adopted");
    lanes.deleteLane(l.id);
  });

  it("different lane ids have separate locks and run in parallel", async () => {
    const order = [];
    const lane1Slow = withLaneLock(10, async () => {
      order.push("lane1-start");
      await new Promise((r) => setTimeout(r, 50));
      order.push("lane1-end");
    });
    const lane2 = withLaneLock(11, async () => {
      order.push("lane2");
    });
    await Promise.all([lane1Slow, lane2]);
    assert.ok(order.includes("lane2"), "lane 2 should run without waiting for lane 1");
    assert.notDeepEqual(order, ["lane1-start", "lane1-end", "lane2"]);
  });

  it("migration: old schema database gains all four columns idempotently", () => {
    const tmpPath = pathMod.join(
      os.tmpdir(),
      `test-lanes-migration-${Date.now()}-${process.pid}.db`
    );
    try {
      // Create an old-schema lanes table with only id, cwd, title columns
      const OldDatabase = require("better-sqlite3");
      const oldDb = new OldDatabase(tmpPath);
      oldDb.exec(`
        CREATE TABLE lanes (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          title TEXT NOT NULL DEFAULT '',
          cwd TEXT NOT NULL UNIQUE,
          branch TEXT,
          pipeline TEXT NOT NULL DEFAULT 'default',
          session_id TEXT,
          run_id TEXT,
          stage TEXT NOT NULL DEFAULT 'idle',
          stage_since TEXT,
          status TEXT NOT NULL DEFAULT 'idle',
          gate_decision TEXT,
          ci_status TEXT,
          needs_action TEXT,
          links TEXT NOT NULL DEFAULT '{}',
          stages TEXT NOT NULL DEFAULT '{}',
          notes TEXT,
          created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
          updated_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
        )
      `);
      oldDb
        .prepare(
          "INSERT INTO lanes (title, cwd, branch, pipeline, stage_since) VALUES (?, ?, ?, ?, ?)"
        )
        .run("old-lane", "/tmp/old-lane-path", "main", "default", "2026-07-27T00:00:00Z");
      oldDb.close();

      // Load db.js against it, which should add the four columns
      process.env.DASHBOARD_DB_PATH = tmpPath;
      delete require.cache[require.resolve("../db")];
      const { db: newDb } = require("../db");

      // Verify all four columns exist
      const checkCols = [
        "SELECT kind FROM lanes LIMIT 1",
        "SELECT source_repo FROM lanes LIMIT 1",
        "SELECT base_branch FROM lanes LIMIT 1",
        "SELECT slug FROM lanes LIMIT 1",
      ];
      checkCols.forEach((sql) => {
        assert.doesNotThrow(() => newDb.prepare(sql).get());
      });

      // Verify existing row has kind='adopted' and others NULL
      const row = newDb.prepare("SELECT * FROM lanes WHERE cwd = ?").get("/tmp/old-lane-path");
      assert.equal(row.kind, "adopted");
      assert.equal(row.source_repo, null);
      assert.equal(row.base_branch, null);
      assert.equal(row.slug, null);
    } finally {
      process.env.DASHBOARD_DB_PATH = SUITE_DB_PATH;
      delete require.cache[require.resolve("../db")];
      try {
        require("fs").rmSync(tmpPath, { force: true });
      } catch {
        /* cleanup best effort */
      }
    }
  });
});

describe("stage detection", () => {
  it("writes a forward detection", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-forward" });
    const result = lanes.recordDetection(l.id, { nodeId: "implement", signal: "`Edit`" });
    assert.deepEqual(result, { written: true });
    const after = lanes.getLane(l.id);
    assert.equal(after.detected_stage, "implement");
    assert.equal(after.detected_signal, "`Edit`");
    assert.ok(after.detected_at);
    lanes.deleteLane(l.id);
  });

  it("drops a detection that does not advance past the current detected stage", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-backward" });
    lanes.recordDetection(l.id, { nodeId: "tests" });
    const result = lanes.recordDetection(l.id, { nodeId: "implement" });
    assert.deepEqual(result, { written: false, reason: "behind-detected" });
    assert.equal(lanes.getLane(l.id).detected_stage, "tests");
    lanes.deleteLane(l.id);
  });

  it("drops a detection at or behind the declared stage", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-declared" });
    lanes.setStage(l.id, { stage: "review" });
    const atDeclared = lanes.recordDetection(l.id, { nodeId: "review" });
    assert.deepEqual(atDeclared, { written: false, reason: "behind-declared" });
    const behindDeclared = lanes.recordDetection(l.id, { nodeId: "implement" });
    assert.deepEqual(behindDeclared, { written: false, reason: "behind-declared" });
    assert.equal(lanes.getLane(l.id).detected_stage, null);
    lanes.deleteLane(l.id);
  });

  it("reports unknown-node for a node id the pipeline does not have", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-unknown" });
    const result = lanes.recordDetection(l.id, { nodeId: "not-a-real-node" });
    assert.deepEqual(result, { written: false, reason: "unknown-node" });
    assert.equal(lanes.getLane(l.id).detected_stage, null);
    lanes.deleteLane(l.id);
  });

  it("PREMISE GUARD: a lane with only detections and no declarations has no done node", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-no-done" });
    lanes.recordDetection(l.id, { nodeId: "review", signal: "`git diff`" });
    const payload = lanes.lanePayload(lanes.getLane(l.id));
    assert.ok(
      !payload.pipeline_nodes.some((n) => n.state === "done"),
      "inference must never render a node done — only a declared stage carrying evidence may"
    );
    // lane.stage is still the default "idle", which is not itself a pipeline
    // node/alias, so nodeStates() (unaware of detection) reports "pending" for
    // every node here — detection only ever adds the `detected` flag alongside
    // whatever nodeStates() already computed from the declared stage.
    const review = payload.pipeline_nodes.find((n) => n.id === "review");
    assert.equal(review.state, "pending");
    assert.equal(review.detected, true);
    const implement = payload.pipeline_nodes.find((n) => n.id === "implement");
    assert.equal(implement.detected, true);
    const done = payload.pipeline_nodes.find((n) => n.id === "done");
    assert.equal(done.detected, false);
    lanes.deleteLane(l.id);
  });

  it("PREMISE GUARD: a node declared WITH evidence stays done and unflagged under a detection ahead of it", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-done-guard" });
    // implement declared with evidence, then the lane declares tests; a review
    // detection lands ahead of both. `implement` is the adversarial node: it is
    // `done` (declared + evidence) and it sits before the detected index.
    lanes.setStage(l.id, { stage: "implement", evidence: "server/lib/x.js" });
    lanes.setStage(l.id, { stage: "tests" });
    assert.deepEqual(lanes.recordDetection(l.id, { nodeId: "review", signal: "`git diff`" }), {
      written: true,
    });

    const nodes = lanes.lanePayload(lanes.getLane(l.id)).pipeline_nodes;
    const implement = nodes.find((n) => n.id === "implement");
    assert.equal(implement.state, "done");
    assert.equal(implement.detected, false);
    lanes.deleteLane(l.id);
  });

  it("a stage declared by ALIAS keeps its current ring instead of reading as an inference", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-alias-current" });
    // "coding" is an alias of the `implement` node, so `stages` gets no entry
    // under "implement" — the declared current node must still not be flagged.
    lanes.setStage(l.id, { stage: "coding", evidence: "server/lib/x.js" });
    assert.deepEqual(lanes.recordDetection(l.id, { nodeId: "tests", signal: "`npm test`" }), {
      written: true,
    });

    const nodes = lanes.lanePayload(lanes.getLane(l.id)).pipeline_nodes;
    const implement = nodes.find((n) => n.id === "implement");
    assert.equal(implement.state, "current");
    assert.equal(implement.detected, false);
    lanes.deleteLane(l.id);
  });

  it("never writes the declared stage: stage and stage_since are byte-identical after a detection", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-no-stage-write" });
    lanes.setStage(l.id, { stage: "plan" });
    const before = lanes.getLane(l.id);
    assert.deepEqual(lanes.recordDetection(l.id, { nodeId: "tests", signal: "`npm test`" }), {
      written: true,
    });
    const after = lanes.getLane(l.id);
    assert.equal(after.stage, before.stage);
    assert.equal(after.stage_since, before.stage_since);
    lanes.deleteLane(l.id);
  });

  it("clearLane nulls the detection columns and lets a fresh detection land immediately", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-clear" });
    lanes.recordDetection(l.id, { nodeId: "ship", signal: "`git push`" });
    assert.equal(lanes.getLane(l.id).detected_stage, "ship");

    const cleared = lanes.clearLane(l.id);
    assert.equal(cleared.detected_stage, null);
    assert.equal(cleared.detected_signal, null);
    assert.equal(cleared.detected_at, null);
    assert.ok(
      !lanes.lanePayload(cleared).pipeline_nodes.some((n) => n.detected),
      "a cleared lane must claim no inferred progress"
    );

    // Without the reset, `ship` would forever outrank every later detection.
    assert.deepEqual(lanes.recordDetection(l.id, { nodeId: "implement", signal: "`Edit`" }), {
      written: true,
    });
    assert.equal(lanes.getLane(l.id).detected_stage, "implement");
    lanes.deleteLane(l.id);
  });
  describe("clearLane archives the active feature first", () => {
    it("archives the active feature with its final stage before resetting the live row", () => {
      const l = lanes.createLane({ title: "t", cwd: "/tmp/wt-archive-active" });
      features.activateFeature(l.id, "one");
      lanes.setStage(l.id, { stage: "review", evidence: "e" });

      lanes.clearLane(l.id);

      const archived = features.getFeature(l.id, "one");
      assert.notEqual(archived.archived_at, null);
      assert.equal(archived.stage, "review");
      const cleared = lanes.getLane(l.id);
      assert.equal(cleared.stage, "idle");
      assert.equal(cleared.active_feature_id, null);
      lanes.deleteLane(l.id);
    });

    it("is unchanged for a lane that never activated a feature (no archive row created)", () => {
      const l = lanes.createLane({ title: "t2", cwd: "/tmp/wt-archive-none" });
      lanes.setStage(l.id, { stage: "review" });
      lanes.clearLane(l.id);
      const cleared = lanes.getLane(l.id);
      assert.equal(cleared.stage, "idle");
      lanes.deleteLane(l.id);
    });
  });

  it("a real stage transition clears a stale detection and unblocks a fresh one behind it", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-stale-cross-task" });
    // A prior, unrelated task's tool calls left `tests` as the detected stage.
    lanes.recordDetection(l.id, { nodeId: "tests", signal: "`npm test`" });
    assert.equal(lanes.getLane(l.id).detected_stage, "tests");

    // A new task starts and the agent declares an EARLIER stage. Without the
    // fix, the leftover `tests` detection both misrepresents the new task's
    // progress and (via forward-only) rejects every real detection for it
    // until `tests` ages past DETECTION_TTL_MS.
    const after = lanes.setStage(l.id, { stage: "plan" });
    assert.equal(after.detected_stage, null);
    assert.equal(after.detected_signal, null);
    assert.equal(after.detected_at, null);

    assert.deepEqual(lanes.recordDetection(l.id, { nodeId: "implement", signal: "`Edit`" }), {
      written: true,
    });
    assert.equal(lanes.getLane(l.id).detected_stage, "implement");
    lanes.deleteLane(l.id);
  });

  it("re-declaring the SAME stage (a heartbeat) leaves a live detection alone", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-heartbeat-noop" });
    lanes.setStage(l.id, { stage: "plan" });
    assert.deepEqual(lanes.recordDetection(l.id, { nodeId: "implement", signal: "`Edit`" }), {
      written: true,
    });
    lanes.setStage(l.id, { stage: "plan", note: "still planning" });
    assert.equal(lanes.getLane(l.id).detected_stage, "implement");
    lanes.deleteLane(l.id);
  });

  it("migration: detection columns are added to a database holding an old-schema lanes row", () => {
    const tmpPath = pathMod.join(
      os.tmpdir(),
      `test-lanes-detect-migration-${Date.now()}-${process.pid}.db`
    );
    try {
      const OldDatabase = require("better-sqlite3");
      const oldDb = new OldDatabase(tmpPath);
      oldDb.exec(`
        CREATE TABLE lanes (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          title TEXT NOT NULL DEFAULT '',
          cwd TEXT NOT NULL UNIQUE,
          branch TEXT,
          pipeline TEXT NOT NULL DEFAULT 'default',
          session_id TEXT,
          run_id TEXT,
          stage TEXT NOT NULL DEFAULT 'idle',
          stage_since TEXT,
          status TEXT NOT NULL DEFAULT 'idle',
          gate_decision TEXT,
          ci_status TEXT,
          needs_action TEXT,
          links TEXT NOT NULL DEFAULT '{}',
          stages TEXT NOT NULL DEFAULT '{}',
          notes TEXT,
          created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
          updated_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
          kind TEXT NOT NULL DEFAULT 'adopted',
          source_repo TEXT,
          base_branch TEXT,
          slug TEXT
        )
      `);
      oldDb
        .prepare(
          "INSERT INTO lanes (title, cwd, branch, pipeline, stage_since) VALUES (?, ?, ?, ?, ?)"
        )
        .run(
          "pre-detect-lane",
          "/tmp/pre-detect-lane-path",
          "main",
          "default",
          "2026-07-27T00:00:00Z"
        );
      oldDb.close();

      process.env.DASHBOARD_DB_PATH = tmpPath;
      delete require.cache[require.resolve("../db")];
      const { db: newDb } = require("../db");

      ["detected_stage", "detected_signal", "detected_at"].forEach((col) => {
        assert.doesNotThrow(() => newDb.prepare(`SELECT ${col} FROM lanes LIMIT 1`).get());
      });
      const row = newDb
        .prepare("SELECT * FROM lanes WHERE cwd = ?")
        .get("/tmp/pre-detect-lane-path");
      assert.equal(row.detected_stage, null);
      assert.equal(row.detected_signal, null);
      assert.equal(row.detected_at, null);
    } finally {
      process.env.DASHBOARD_DB_PATH = SUITE_DB_PATH;
      delete require.cache[require.resolve("../db")];
      try {
        require("fs").rmSync(tmpPath, { force: true });
      } catch {
        /* cleanup best effort */
      }
    }
  });

  it("migration: a crash after only the first detection column self-heals on the next load", () => {
    const tmpPath = pathMod.join(
      os.tmpdir(),
      `test-lanes-detect-crash-${Date.now()}-${process.pid}.db`
    );
    try {
      const OldDatabase = require("better-sqlite3");
      const oldDb = new OldDatabase(tmpPath);
      oldDb.exec(`
        CREATE TABLE lanes (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          title TEXT NOT NULL DEFAULT '',
          cwd TEXT NOT NULL UNIQUE,
          branch TEXT,
          pipeline TEXT NOT NULL DEFAULT 'default',
          session_id TEXT,
          run_id TEXT,
          stage TEXT NOT NULL DEFAULT 'idle',
          stage_since TEXT,
          status TEXT NOT NULL DEFAULT 'idle',
          gate_decision TEXT,
          ci_status TEXT,
          needs_action TEXT,
          links TEXT NOT NULL DEFAULT '{}',
          stages TEXT NOT NULL DEFAULT '{}',
          notes TEXT,
          created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
          updated_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
          kind TEXT NOT NULL DEFAULT 'adopted',
          source_repo TEXT,
          base_branch TEXT,
          slug TEXT
        )
      `);
      // Simulate a process death that landed only the first ALTER.
      oldDb.exec("ALTER TABLE lanes ADD COLUMN detected_stage TEXT");
      oldDb.close();

      process.env.DASHBOARD_DB_PATH = tmpPath;
      delete require.cache[require.resolve("../db")];
      const { db: newDb } = require("../db");

      ["detected_stage", "detected_signal", "detected_at"].forEach((col) => {
        assert.doesNotThrow(() => newDb.prepare(`SELECT ${col} FROM lanes LIMIT 1`).get());
      });
    } finally {
      process.env.DASHBOARD_DB_PATH = SUITE_DB_PATH;
      delete require.cache[require.resolve("../db")];
      try {
        require("fs").rmSync(tmpPath, { force: true });
      } catch {
        /* cleanup best effort */
      }
    }
  });

  it("detection expiry: backward detection inside window is rejected", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-expiry-window" });
    // Set an initial forward detection
    lanes.recordDetection(l.id, { nodeId: "tests" });
    // Try backward detection - should still be rejected within window
    const result = lanes.recordDetection(l.id, { nodeId: "implement" });
    assert.deepEqual(result, { written: false, reason: "behind-detected" });
    assert.equal(lanes.getLane(l.id).detected_stage, "tests");
    lanes.deleteLane(l.id);
  });

  it("detection expiry: backward detection beyond TTL is accepted and written", () => {
    const { db } = require("../db");
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-expiry-stale" });
    // Set an initial forward detection with a stale timestamp
    lanes.recordDetection(l.id, { nodeId: "tests" });
    // Manually set detected_at to an old time (2 hours ago, assuming default TTL of 30 min)
    const oldTime = new Date(Date.now() - 2 * 60 * 60 * 1000).toISOString();
    db.prepare("UPDATE lanes SET detected_at = ? WHERE id = ?").run(oldTime, l.id);

    // Try backward detection - should be accepted because detection is stale
    const result = lanes.recordDetection(l.id, { nodeId: "implement" });
    assert.deepEqual(result, { written: true });
    assert.equal(lanes.getLane(l.id).detected_stage, "implement");
    lanes.deleteLane(l.id);
  });

  it("detection expiry: stale detection behind declared stage still rejects", () => {
    const { db } = require("../db");
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-expiry-declared" });
    lanes.setStage(l.id, { stage: "review" });
    // setStage now clears detected_* on every real transition (a fresh
    // declaration supersedes older inference), so a standing detection is
    // written directly here, bypassing that, to isolate the rule this test
    // is actually about: declared-wins is never relaxed by staleness, no
    // matter how the stale detection got there.
    const oldTime = new Date(Date.now() - 2 * 60 * 60 * 1000).toISOString();
    db.prepare("UPDATE lanes SET detected_stage = ?, detected_at = ? WHERE id = ?").run(
      "tests",
      oldTime,
      l.id
    );

    // Try backward detection to implement - should still be rejected because declared stage is ahead
    const result = lanes.recordDetection(l.id, { nodeId: "implement" });
    assert.deepEqual(result, { written: false, reason: "behind-declared" });
    assert.equal(lanes.getLane(l.id).detected_stage, "tests");
    lanes.deleteLane(l.id);
  });

  it("detection expiry: NULL detected_at is treated as stale", () => {
    const { db } = require("../db");
    const l = lanes.createLane({ cwd: "/tmp/wt-detect-expiry-null" });
    // Set a detection and then nullify detected_at
    lanes.recordDetection(l.id, { nodeId: "tests" });
    db.prepare("UPDATE lanes SET detected_at = NULL WHERE id = ?").run(l.id);

    // Try backward detection - should be accepted because detected_at is NULL (unknown age)
    const result = lanes.recordDetection(l.id, { nodeId: "implement" });
    assert.deepEqual(result, { written: true });
    assert.equal(lanes.getLane(l.id).detected_stage, "implement");
    lanes.deleteLane(l.id);
  });

  it("detection expiry: DETECTION_TTL_MS env var controls the window", () => {
    const { db } = require("../db");
    const oldTTL = process.env.DETECTION_TTL_MS;
    try {
      // Set a very short TTL (1 second)
      process.env.DETECTION_TTL_MS = "1000";
      const l = lanes.createLane({ cwd: "/tmp/wt-detect-expiry-ttl" });
      // Set initial detection
      lanes.recordDetection(l.id, { nodeId: "tests" });
      // Set detected_at to 2 seconds ago (beyond the 1-second TTL)
      const staleTime = new Date(Date.now() - 2000).toISOString();
      db.prepare("UPDATE lanes SET detected_at = ? WHERE id = ?").run(staleTime, l.id);

      // Try backward detection - should be accepted because we're beyond TTL
      const result = lanes.recordDetection(l.id, { nodeId: "implement" });
      assert.deepEqual(result, { written: true });
      lanes.deleteLane(l.id);
    } finally {
      if (oldTTL === undefined) {
        delete process.env.DETECTION_TTL_MS;
      } else {
        process.env.DETECTION_TTL_MS = oldTTL;
      }
    }
  });
});

describe("the forward-only hold is short enough for one work session", () => {
  it("lets a newer signal move the lane back within a few minutes", () => {
    const { db } = require("../db");
    const l = lanes.createLane({ cwd: "/tmp/wt-hold-window" });
    // A real session cycles implement -> tests -> ship -> implement -> tests.
    // With a 30-minute hold, one push pinned the lane at `ship` for half an
    // hour while the agent was demonstrably back to running tests.
    lanes.recordDetection(l.id, { nodeId: "ship" });
    const sixMinutesAgo = new Date(Date.now() - 6 * 60 * 1000).toISOString();
    db.prepare("UPDATE lanes SET detected_at = ? WHERE id = ?").run(sixMinutesAgo, l.id);

    const result = lanes.recordDetection(l.id, { nodeId: "tests", signal: "node --test" });
    assert.deepEqual(result, { written: true });
    assert.equal(lanes.getLane(l.id).detected_stage, "tests");
    lanes.deleteLane(l.id);
  });

  it("still smooths noise inside one burst of activity", () => {
    const l = lanes.createLane({ cwd: "/tmp/wt-hold-burst" });
    lanes.recordDetection(l.id, { nodeId: "tests" });
    // Same second: a Read after an Edit must not drag the lane backwards.
    const result = lanes.recordDetection(l.id, { nodeId: "implement" });
    assert.deepEqual(result, { written: false, reason: "behind-detected" });
    assert.equal(lanes.getLane(l.id).detected_stage, "tests");
    lanes.deleteLane(l.id);
  });
});