"use strict";

const test = require("node:test");
const assert = require("node:assert/strict");
const safety = require("../../Web/playout-safety.js");

function ready(overrides = {}) {
  return {
    pending: false,
    outcomeUnknown: false,
    commandAvailable: true,
    engineState: "IDLE",
    preparedCode: null,
    onAirCode: null,
    ...overrides
  };
}

test("NEXT is blocked until a scene is on air", () => {
  assert.equal(safety.commandBlockReason(ready(), "next"), "next-requires-on-air");
  assert.equal(
    safety.commandBlockReason(ready({ engineState: "PREPARED", preparedCode: "5001" }), "next"),
    "next-requires-on-air");
  assert.equal(
    safety.commandBlockReason(ready({ engineState: "PROGRAM", onAirCode: "5001" }), "next"),
    null);
});

test("OutcomeUnknown and unavailable states block every command", () => {
  for (const command of ["prepare", "take-in", "next", "take-out"]) {
    assert.equal(
      safety.commandBlockReason(ready({ outcomeUnknown: true }), command),
      "outcome-unknown");
    assert.equal(
      safety.commandBlockReason(ready({ commandAvailable: false }), command),
      "unavailable");
  }
});

test("TAKE IN and TAKE OUT preserve the native state prerequisites", () => {
  assert.equal(safety.commandBlockReason(ready(), "take-in"), "take-in-requires-prepare");
  assert.equal(safety.commandBlockReason(ready(), "take-out"), "nothing-to-take-out");
  assert.equal(
    safety.commandBlockReason(ready({ preparedCode: "5001" }), "take-in"),
    null);
  assert.equal(
    safety.commandBlockReason(ready({ onAirCode: "5001" }), "take-out"),
    null);
});

test("legacy F8 chooses exactly one safe PREPARE or TAKE IN action", () => {
  assert.equal(
    safety.legacyTakeInShortcutAction(ready({ takeInAllowed: true })),
    "prepare-then-take-in");
  assert.equal(
    safety.legacyTakeInShortcutAction(ready({
      takeInAllowed: true,
      engineState: "PREPARED",
      preparedCode: "5001"
    })),
    "take-in");
  assert.equal(
    safety.legacyTakeInShortcutAction(ready({
      takeInAllowed: true,
      engineState: "PROGRAM",
      onAirCode: "5001"
    })),
    "next-required");
  assert.equal(
    safety.legacyTakeInShortcutAction(ready({ takeInAllowed: false })),
    "take-in-locked");
  assert.equal(
    safety.legacyTakeInShortcutAction(ready({ takeInAllowed: true, pending: true })),
    "blocked");
});

test("Refresh faults block mutations but preserve emergency TAKE OUT", () => {
  const faulted = ready({
    refreshFaulted: true,
    engineState: "PROGRAM",
    onAirCode: "5001"
  });
  for (const command of ["prepare", "take-in", "next"]) {
    assert.equal(safety.commandBlockReason(faulted, command), "refresh-fault");
  }
  assert.equal(safety.commandBlockReason(faulted, "take-out"), null);
  assert.equal(
    safety.canClearCommandError({ code: "REFRESH_FAULT", nonClearable: true }, false),
    false);
});

test("Browser response timeout follows the bounded native operation timeout", () => {
  assert.equal(safety.responseTimeoutFromNative(5000), 10000);
  assert.equal(safety.responseTimeoutFromNative(300000), 305000);
  assert.equal(safety.responseTimeoutFromNative(100), 5100);
  assert.equal(safety.responseTimeoutFromNative(99), 15000);
  assert.equal(safety.responseTimeoutFromNative("not-a-number"), 15000);
});

test("Connection state normalization is allowlisted", () => {
  assert.equal(safety.normalizeConnectionState("Outcome_Unknown"), "outcome-unknown");
  assert.equal(safety.normalizeConnectionState("RECONNECTING"), "reconnecting");
  assert.equal(safety.normalizeConnectionState("attacker-defined"), "unavailable");
});

test("Late or mismatched native responses cannot complete a pending command", () => {
  const pending = { requestId: "REQ-2", command: "next" };
  assert.equal(
    safety.matchesPendingCommand(pending, { requestId: "REQ-2", command: "next" }),
    true);
  assert.equal(
    safety.matchesPendingCommand(pending, { requestId: "REQ-1", command: "next" }),
    false);
  assert.equal(
    safety.matchesPendingCommand(pending, { requestId: "REQ-2", command: "take-in" }),
    false);
  assert.equal(safety.matchesPendingCommand(null, { requestId: "REQ-2", command: "next" }), false);
});

test("Timeout and OutcomeUnknown errors cannot clear the session quarantine", () => {
  assert.equal(
    safety.canClearCommandError({ code: "WEB_TIMEOUT", outcomeUnknown: true }, true),
    false);
  assert.equal(
    safety.canClearCommandError({ code: "OUTCOME_UNKNOWN", outcomeUnknown: true }, false),
    false);
  assert.equal(
    safety.canClearCommandError({ code: "DATABASE_UNAVAILABLE", outcomeUnknown: false }, false),
    true);
});

test("Playlist snapshot locks before PREPARE completes and through TAKE OUT", () => {
  assert.equal(safety.playlistSnapshotLocked(ready()), false);
  assert.equal(safety.playlistSnapshotLocked(ready({ pending: true })), true);
  assert.equal(safety.playlistSnapshotLocked(ready({ outcomeUnknown: true })), true);
  assert.equal(
    safety.playlistSnapshotLocked(ready({ engineState: "PREPARED", preparedCode: "5001" })),
    true);
  assert.equal(
    safety.playlistSnapshotLocked(ready({ engineState: "PROGRAM", onAirCode: "5001" })),
    true);
});

test("A database refresh fault clears only after TAKE OUT resets refresh state", () => {
  const fault = {
    code: "DATABASE_UNAVAILABLE",
    message: "Read failed",
    nonClearable: true,
    isRefreshFault: true
  };
  assert.equal(fault.code, "DATABASE_UNAVAILABLE");
  assert.equal(fault.nonClearable, true);
  assert.equal(fault.isRefreshFault, true);
  assert.equal(safety.shouldClearRefreshError(fault, true), false);
  assert.equal(safety.shouldClearRefreshError(fault, false), true);

  const unrelated = { code: "SCENE_DATA_INVALID", outcomeUnknown: false };
  assert.equal(safety.shouldClearRefreshError(unrelated, false), false);
});

test("Database health snapshots accept only a strictly increasing native sequence", () => {
  assert.equal(safety.isNewerDatabaseStatusSequence(0, 1), true);
  assert.equal(safety.isNewerDatabaseStatusSequence(7, 8), true);
  assert.equal(safety.isNewerDatabaseStatusSequence(7, 7), false);
  assert.equal(safety.isNewerDatabaseStatusSequence(7, 6), false);
  assert.equal(safety.isNewerDatabaseStatusSequence(7, "8"), false);
  assert.equal(safety.isNewerDatabaseStatusSequence(7, null), false);
});

test("Stored conditional aliases preserve the exact builder owner", () => {
  const catalog = [
    { builderKey: "s5032", code: "5032", aliases: ["5032", "8018", "8032"] },
    { builderKey: "s8018", code: "8018", aliases: ["8018", "8032", "5032"] }
  ];
  assert.equal(safety.resolveStoredCatalogIndex(catalog, "s5032", "8018"), 0);
  assert.equal(safety.resolveStoredCatalogIndex(catalog, "s8018", "5032"), 1);
  assert.equal(safety.resolveStoredCatalogIndex(catalog, "", "8032"), 0);
});