/**
 * @file Tests for the two aggregate endpoints the Workflows page reads:
 * GET /api/lanes/pipeline-stats (how often each pipeline node was passed,
 * over lanes AND archived features) and GET /api/workflows/skill-usage
 * (per-skill and per-plugin call counts). Both are pure reporting endpoints,
 * so the risks are miscounting — double-counting a tool call that emits both a
 * Pre and a Post event, or losing an archived feature's history.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const os = require("node:os");
const path = require("node:path");
const fs = require("node:fs");
const http = require("node:http");

const SUITE_ROOT = fs.mkdtempSync(path.join(os.tmpdir(), "ccam-usage-api-"));
process.env.DASHBOARD_DB_PATH = path.join(SUITE_ROOT, "dashboard.db");
process.env.LANES_ROOT = path.join(SUITE_ROOT, "lanes");

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

const { createApp } = require("../index");
const lanesLib = require("../lib/lanes");
const { db, stmts } = require("../db");

let server;
let PORT;

before(async () => {
  const app = createApp();
  server = http.createServer(app);
  await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
  PORT = server.address().port;
});
after(async () => {
  await new Promise((resolve) => server.close(resolve));
  fs.rmSync(SUITE_ROOT, { recursive: true, force: true });
});

function get(urlPath) {
  return new Promise((resolve, reject) => {
    const req = http.request(
      { method: "GET", hostname: "127.0.0.1", port: PORT, path: urlPath },
      (res) => {
        let raw = "";
        res.on("data", (c) => (raw += c));
        res.on("end", () => resolve({ status: res.statusCode, body: JSON.parse(raw) }));
      }
    );
    req.on("error", reject);
    req.end();
  });
}

let laneSeq = 0;
function makeLane() {
  laneSeq += 1;
  const cwd = path.join(SUITE_ROOT, `lane-cwd-${laneSeq}`);
  fs.mkdirSync(cwd, { recursive: true });
  return lanesLib.createLane({ title: `lane ${laneSeq}`, cwd, kind: "managed" });
}

function setStages(laneId, stages) {
  db.prepare("UPDATE lanes SET stages = ? WHERE id = ?").run(JSON.stringify(stages), laneId);
}

function node(pipelineStats, pipelineId, nodeId) {
  const p = pipelineStats.pipelines.find((x) => x.id === pipelineId);
  return p && p.nodes.find((n) => n.id === nodeId);
}

describe("GET /api/lanes/pipeline-stats", () => {
  it("counts a pass with evidence apart from a pass without one, and a fail as neither", async () => {
    const lane = makeLane();
    setStages(lane.id, {
      plan: { enteredAt: "2026-01-01T00:00:00Z", evidence: "plan.md", result: null },
      implement: { enteredAt: "2026-01-01T01:00:00Z", evidence: null, result: null },
      tests: { enteredAt: "2026-01-01T02:00:00Z", evidence: null, result: "fail" },
    });

    const res = await get("/api/lanes/pipeline-stats");
    assert.equal(res.status, 200);

    const plan = node(res.body, "default", "plan");
    assert.deepEqual(
      { entered: plan.entered, passed: plan.passed, withEvidence: plan.withEvidence },
      { entered: 1, passed: 1, withEvidence: 1 }
    );

    const implement = node(res.body, "default", "implement");
    assert.deepEqual(
      { passed: implement.passed, withEvidence: implement.withEvidence },
      { passed: 1, withEvidence: 0 }
    );

    const tests = node(res.body, "default", "tests");
    assert.deepEqual(
      { entered: tests.entered, passed: tests.passed, failed: tests.failed },
      { entered: 1, passed: 0, failed: 1 }
    );
  });

  it("leaves a node never reached at zero", async () => {
    const res = await get("/api/lanes/pipeline-stats");
    assert.equal(node(res.body, "default", "ship").entered, 0);
  });

  it("keeps counting an archived feature's stages after the lane moves on", async () => {
    const lane = makeLane();
    db.prepare(
      `INSERT INTO lane_features (lane_id, slug, pipeline, stage, stages, archived_at)
       VALUES (?, 'old', 'default', 'done', ?, '2026-01-02T00:00:00Z')`
    ).run(lane.id, JSON.stringify({ gate: { enteredAt: "x", evidence: "GO", result: null } }));

    const res = await get("/api/lanes/pipeline-stats");
    const gate = node(res.body, "default", "gate");
    assert.equal(gate.passed, 1);
    assert.equal(gate.withEvidence, 1);
  });

  it("narrows to one lane and its own archived features with ?lane=", async () => {
    const mine = makeLane();
    const other = makeLane();
    setStages(mine.id, { plan: { enteredAt: "x", evidence: "plan.md", result: null } });
    setStages(other.id, { plan: { enteredAt: "x", evidence: null, result: null } });
    db.prepare(
      `INSERT INTO lane_features (lane_id, slug, pipeline, stage, stages, archived_at)
       VALUES (?, 'mine-old', 'default', 'done', ?, '2026-01-02T00:00:00Z')`
    ).run(mine.id, JSON.stringify({ plan: { enteredAt: "x", evidence: "old.md", result: null } }));

    const res = await get(`/api/lanes/pipeline-stats?lane=${mine.id}`);
    assert.equal(res.status, 200);
    const plan = node(res.body, "default", "plan");
    // The lane itself plus its one archived feature — never the other lane's.
    assert.deepEqual(
      { entered: plan.entered, withEvidence: plan.withEvidence },
      { entered: 2, withEvidence: 2 }
    );
  });

  it("always returns every lane for the picker, even when narrowed", async () => {
    const lane = makeLane();
    const res = await get(`/api/lanes/pipeline-stats?lane=${lane.id}`);
    assert.ok(res.body.lanes.length > 1);
    assert.ok(res.body.lanes.every((l) => l.id && typeof l.cwd === "string"));
  });

  it("still describes the template for a lane that has recorded nothing", async () => {
    const lane = makeLane();
    const res = await get(`/api/lanes/pipeline-stats?lane=${lane.id}`);
    assert.equal(res.status, 200);
    assert.equal(node(res.body, "default", "plan").entered, 0);
  });

  it("returns no pipelines at all for a lane id that does not exist", async () => {
    const res = await get("/api/lanes/pipeline-stats?lane=999999");
    assert.equal(res.status, 200);
    assert.deepEqual(res.body.pipelines, []);
  });

  it("rejects a lane filter that is not an id", async () => {
    const res = await get("/api/lanes/pipeline-stats?lane=../etc");
    assert.equal(res.status, 400);
    assert.equal(res.body.error.code, "EBADLANE");
  });
});

describe("GET /api/workflows/skill-usage", () => {
  before(() => {
    stmts.insertSession.run("usage-s1", "usage", "active", "/tmp/usage", null, null);
    const ev = (type, tool, data) =>
      stmts.insertEvent.run("usage-s1", null, type, tool, "", JSON.stringify(data));

    // Two full calls of the same skill: each emits Pre + Post, so a naive
    // COUNT(*) would report four.
    for (let i = 0; i < 2; i += 1) {
      ev("PreToolUse", "Skill", { tool_input: { skill: "ccam:ship-feature" } });
      ev("PostToolUse", "Skill", { tool_input: { skill: "ccam:ship-feature" } });
    }
    ev("PreToolUse", "Skill", { tool_input: { skill: "daily-report" } });
    ev("PreToolUse", "mcp__plugin_ccam_ccam__dashboard_health_check", {});
    ev("PostToolUse", "mcp__plugin_ccam_ccam__dashboard_health_check", {});
  });

  it("counts one call per invocation, not one per hook event", async () => {
    const res = await get("/api/workflows/skill-usage");
    assert.equal(res.status, 200);
    const ship = res.body.skills.find((s) => s.name === "ccam:ship-feature");
    assert.equal(ship.count, 2);
    assert.equal(ship.sessions, 1);
  });

  it("attributes a prefixed skill to its plugin and leaves a bare one unattributed", async () => {
    const res = await get("/api/workflows/skill-usage");
    assert.equal(res.body.skills.find((s) => s.name === "ccam:ship-feature").plugin, "ccam");
    assert.equal(res.body.skills.find((s) => s.name === "daily-report").plugin, null);
  });

  it("adds a plugin's own MCP tool calls to its totals", async () => {
    const res = await get("/api/workflows/skill-usage");
    const ccam = res.body.plugins.find((p) => p.name === "ccam");
    assert.deepEqual(
      { skills: ccam.skills, skillCalls: ccam.skillCalls, mcpCalls: ccam.mcpCalls },
      { skills: 1, skillCalls: 2, mcpCalls: 1 }
    );
  });
});