import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
import type { UsageEventV1, UsageHeartbeatV1 } from "../usageTypes";

vi.mock("server-only", () => ({}));

const dataDir = fs.mkdtempSync(path.join(os.tmpdir(), "evosci-usage-store-"));
process.env.EVOSCIENTIST_DATA_DIR = dataDir;
process.env.EVOSCIENTIST_USAGE_DEPLOYMENT_ID = "11111111-1111-4111-8111-111111111111";
process.env.EVOSCIENTIST_WORKSPACE_ID = "ws1_fixture";

const store = await import("./usageStore");
const fixtures = path.join(process.cwd(), "docs", "schemas", "fixtures");

function fixture(relative: string): UsageEventV1 {
  return JSON.parse(fs.readFileSync(path.join(fixtures, relative), "utf8"));
}

function eventFrom(
  base: UsageEventV1,
  modelCallId: string,
  patch: Partial<UsageEventV1> = {}
): UsageEventV1 {
  const deploymentId = patch.deployment_id ?? base.deployment_id;
  return {
    ...base,
    ...patch,
    deployment_id: deploymentId,
    model_call_id: modelCallId,
    event_id: `${deploymentId}:${modelCallId}:callback_final:1`,
  };
}

function range(filters: Record<string, string> = {}): URLSearchParams {
  return new URLSearchParams({
    from: "2026-07-01T00:00:00.000Z",
    to: "2026-07-31T00:00:00.000Z",
    ...filters,
  });
}

describe("usage store", () => {
  const confirmed = fixture("accepted/confirmed.json");
  const unknown = fixture("accepted/unknown.json");

  beforeAll(() => {
    expect(store.ingestUsageEvent(confirmed).status).toBe("accepted");
    expect(store.ingestUsageEvent(unknown).status).toBe("accepted");
  });

  afterAll(() => {
    store.closeUsageDb();
    fs.rmSync(dataDir, { recursive: true, force: true });
  });

  it("handles duplicate and conflicting observations without changing projection", () => {
    expect(store.ingestUsageEvent(confirmed).status).toBe("duplicate");
    const conflict = fixture("projection/conflicting-confirmed.json");
    expect(store.ingestUsageEvent(conflict).status).toBe("conflict");
    const summary = store.usageSummary(range({ thread_id: "thread-fixture" }));
    expect(summary.total_tokens).toBe("1200");
    expect(summary.confirmed_call_count).toBe("1");
    expect(summary.unknown_call_count).toBe("1");
  });

  it("includes async child calls through source_session_id", () => {
    const child = eventFrom(confirmed, "44444444-4444-4444-8444-444444444444", {
      thread_id: "worker-thread",
      source_session_id: "thread-fixture",
      scope: "async_subagent",
      input_tokens: 50,
      output_tokens: 5,
      provider_total_tokens: 55,
    });
    expect(store.ingestUsageEvent(child).status).toBe("accepted");
    const summary = store.usageSummary(
      range({
        deployment_id: confirmed.deployment_id,
        workspace_id: confirmed.workspace_id,
        thread_id: "thread-fixture",
      })
    );
    expect(summary.total_tokens).toBe("1255");
    expect(summary.confirmed_call_count).toBe("2");
    expect(summary.by_scope).toEqual(
      expect.arrayContaining([
        expect.objectContaining({ key: "async_subagent", total_tokens: "55" }),
      ])
    );
  });

  it("isolates identical call ids across deployments", () => {
    const other = eventFrom(confirmed, confirmed.model_call_id, {
      deployment_id: "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa",
      workspace_id: "ws1_other",
    });
    expect(store.ingestUsageEvent(other).status).toBe("accepted");
    const current = store.usageSummary(
      range({
        deployment_id: confirmed.deployment_id,
        thread_id: "thread-fixture",
      })
    );
    expect(current.confirmed_call_count).toBe("2");
  });

  it("returns exact aggregate values above the JavaScript safe integer", () => {
    for (const id of [
      "55555555-5555-4555-8555-555555555555",
      "66666666-6666-4666-8666-666666666666",
    ]) {
      expect(
        store.ingestUsageEvent(
          eventFrom(confirmed, id, {
            thread_id: "bigint-thread",
            turn_id: "bigint-turn",
            input_tokens: Number.MAX_SAFE_INTEGER,
            output_tokens: 0,
            provider_total_tokens: null,
          })
        ).status
      ).toBe("accepted");
    }
    const summary = store.usageSummary(range({ thread_id: "bigint-thread" }));
    expect(summary.total_tokens).toBe("18014398509481982");
  });

  it("uses a total-order cursor across deployments", () => {
    const first = store.usageCalls(range(), 1, null);
    expect(first.next_cursor).not.toBeNull();
    const decoded = JSON.parse(
      Buffer.from(first.next_cursor!, "base64url").toString("utf8")
    );
    expect(decoded).toEqual({
      at: expect.any(String),
      deployment: expect.any(String),
      id: expect.any(String),
    });
    const second = store.usageCalls(range(), 1, decoded);
    expect(second.items[0]).not.toEqual(first.items[0]);
  });

  it("defaults status to the integrated launcher deployment", () => {
    const heartbeat = (
      deployment_id: string,
      workspace_id: string
    ): UsageHeartbeatV1 => ({
      deployment_id,
      workspace_id,
      emitter_version: "2.0",
      schema_version: 1,
      sender_status: "healthy",
      spool_pending: 0,
      spool_inflight: 0,
      spool_quarantined: 0,
      spool_bytes: 0,
      first_loss_at: null,
      tracking_degraded_reason: null,
      last_error_code: null,
      sent_at: new Date().toISOString(),
    });
    store.recordHeartbeat(
      heartbeat(confirmed.deployment_id, confirmed.workspace_id)
    );
    store.recordHeartbeat(
      heartbeat("bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb", "ws1_latest")
    );
    const status = store.usageStatus(new URLSearchParams());
    expect(status.deployment_id).toBe(confirmed.deployment_id);
    expect(status.workspace_id).toBe(confirmed.workspace_id);
  });

  it("expires inbox data while retaining idempotency tombstones", () => {
    const db = store.usageDb();
    db.prepare(
      "UPDATE usage_event_inbox SET received_at=? WHERE event_id=?"
    ).run("2020-01-01T00:00:00.000Z", confirmed.event_id);
    db.prepare(
      "UPDATE usage_event_conflicts SET received_at=? WHERE event_id=?"
    ).run("2020-01-01T00:00:00.000Z", confirmed.event_id);
    const result = store.runUsageMaintenance(
      Date.parse("2026-07-16T00:00:00.000Z"),
      db
    );
    expect(result.inbox_deleted).not.toBe("0");
    expect(result.conflicts_deleted).not.toBe("0");
    expect(
      db
        .prepare(
          "SELECT event_id FROM usage_event_idempotency WHERE event_id=?"
        )
        .get(confirmed.event_id)
    ).toBeDefined();
    expect(store.ingestUsageEvent(confirmed).status).toBe("duplicate");
  });

  it("creates a restorable online SQLite backup", async () => {
    const destination = path.join(dataDir, "backups", "usage.db");
    await store.backupUsageDatabase(destination);
    expect(fs.statSync(destination).size).toBeGreaterThan(0);
    const Database = (await import("better-sqlite3")).default;
    const backup = new Database(destination, { readonly: true });
    backup.defaultSafeIntegers(true);
    try {
      const row = backup
        .prepare("SELECT COUNT(*) count FROM model_usage")
        .get() as {
        count: bigint;
      };
      expect(row.count).toBeGreaterThan(BigInt(0));
    } finally {
      backup.close();
    }
  });

  it("stores aggregate-only provider reconciliation without rewriting calls", () => {
    const aggregateEvent = eventFrom(
      confirmed,
      "88888888-8888-4888-8888-888888888888",
      {
        provider_profile_id: "aggregate-provider",
        upstream_model_id: "aggregate-model",
        model_alias: "aggregate-model",
        input_tokens: 20,
        output_tokens: 4,
        provider_total_tokens: 24,
      }
    );
    expect(store.ingestUsageEvent(aggregateEvent).status).toBe("accepted");
    const observation = {
      aggregate_id: "provider-window-1",
      deployment_id: confirmed.deployment_id,
      provider_profile_id: "aggregate-provider",
      upstream_model_id: "aggregate-model",
      window_start: "2026-07-16T00:00:00.000Z",
      window_end: "2026-07-17T00:00:00.000Z",
      input_tokens: "25",
      output_tokens: "5",
      provider_total_tokens: "30",
      request_count: "1",
      source_name: "provider-usage-api",
      source_payload: { bucket: "fixture" },
      observed_at: "2026-07-17T00:05:00.000Z",
    };
    expect(store.recordProviderAggregate(observation).status).toBe("accepted");
    expect(store.recordProviderAggregate(observation).status).toBe("duplicate");
    expect(
      store.recordProviderAggregate({ ...observation, input_tokens: "26" })
        .status
    ).toBe("conflict");
    expect(store.providerAggregateDifference(observation.aggregate_id)).toEqual(
      expect.objectContaining({
        reconciliation_mode: "aggregate_only",
        projection_updated: false,
        local: expect.objectContaining({ total_tokens: "24" }),
        provider: expect.objectContaining({ total_tokens: "30" }),
        difference: expect.objectContaining({ total_tokens: "6" }),
      })
    );
    const projection = store.usageSummary(
      range({ provider_profile_id: "aggregate-provider" })
    );
    expect(projection.total_tokens).toBe("24");
  });
});