// Parses server-shaped JSON through the models and checks the status/format
// helpers.
//
// These cover the parts where a mistake is invisible until it reaches a user: a
// derived field the server left out must stay null rather than becoming a
// plausible-looking zero, the badge wording has to match the web app's, and an
// unsupported locale (settable from the web, whose lists are wider than the
// phone's) must not throw out of every date on screen.
import "dart:convert";
import "dart:io";

import "package:flutter_test/flutter_test.dart";
import "package:intl/date_symbol_data_local.dart";
import "package:drivervault_phone/format.dart";
import "package:drivervault_phone/i18n.dart";
import "package:drivervault_phone/main.dart";
import "package:drivervault_phone/models.dart";
import "package:drivervault_phone/screens/car_form_sheet.dart";
import "package:drivervault_phone/screens/car_view_sheet.dart";

void main() {
  // rootBundle (used by loadTranslations) needs the binding initialised.
  TestWidgetsFlutterBinding.ensureInitialized();

  setUpAll(() async {
    await initializeDateFormatting();
    await loadTranslations();
    // Polish exercises both the region-aware number grouping and the localized
    // status wording (one/few/many plurals), so the badge labels below are the
    // Polish strings — the same text the web app renders under pl.
    appSettings.locale = "pl-PL";
    appSettings.currency = "PLN";
    appSettings.dateFormat = "DMY";
  });

  test("FuelEntry keeps uncomputed derived fields null, not zero", () {
    final partial = FuelEntry.fromJson({
      "id": "a",
      "car": "c",
      "date": "2026-07-01T00:00:00Z",
      "km": 1000,
      "liters": 20.0,
      "cost": 120.0,
      "fullTank": false,
      "hasFile": false,
    });
    expect(partial.consumptionL100, isNull);
    expect(partial.distanceKm, isNull);
    expect(formatConsumption(partial.consumptionL100), "—");

    final full = FuelEntry.fromJson({
      "id": "b",
      "car": "c",
      "date": "2026-07-10T00:00:00Z",
      "km": 1500,
      "liters": 35.0,
      "cost": 210.0,
      "fullTank": true,
      "consumptionL100": 6.85,
      "distanceKm": 500,
      "kmPerLiter": 14.6,
      "pricePerLiter": 6.0,
      "fileName": "receipt.pdf",
      "hasFile": true,
    });
    expect(full.consumptionL100, 6.85);
    // 6.85 as a float64 is really 6.8499…, so one-decimal rounding yields 6.8 —
    // the same answer JS toFixed(1) gives the web app.
    expect(formatConsumption(full.consumptionL100), "6.8 L/100km");
    expect(full.hasFile, isTrue);
    expect(full.fileName, "receipt.pdf");
  });

  test("expiryStatus wording follows the server assessment", () {
    CarDocument doc(String state, int? days) => CarDocument.fromJson({
          "id": "d",
          "car": "c",
          "type": "insurance",
          "title": "OC",
          "expiry": {"state": state, "daysUntilExpiry": days},
          "hasFile": false,
        });
    expect(expiryStatus(doc("expired", -5).expiry).label, "Wygasło 5 dni temu");
    expect(expiryStatus(doc("expiring_soon", 0).expiry).label, "Wygasa dzisiaj");
    expect(expiryStatus(doc("expiring_soon", 12).expiry).label, "Odnowienie za 12 dni");
    expect(expiryStatus(doc("valid", 200).expiry).label, "Ważne · 200 dni");
    expect(expiryStatus(doc("no_expiry", null).expiry).label, "Bezterminowe");
    expect(expiryStatus(doc("expired", -5).expiry).key, StatusKey.overdue);
  });

  test("reminderStatus leads with the driving trigger", () {
    Reminder rem(Map<String, dynamic> extra) =>
        Reminder.fromJson({"id": "r", "car": "c", "title": "t", "type": "service", ...extra});

    expect(reminderStatus(rem({"status": "done", "done": true})).label, "Gotowe");
    expect(reminderStatus(rem({"status": "no_trigger"})).label, "Brak wyzwalacza");
    expect(
        reminderStatus(rem({"status": "overdue", "daysLeft": -3, "kmLeft": -200})).label,
        "Zaległe 3 dni · 200 km");
    expect(reminderStatus(rem({"status": "due_soon", "daysLeft": 0})).label, "Termin za dzisiaj");
    // The km count is grouped per the chosen locale (pl-PL groups thousands with
    // a space), which is the whole point of routing every number through the one
    // helper. Asserted as start + end so the exact space glyph (ICU uses a
    // non-breaking space) does not make the test brittle.
    final due = reminderStatus(rem({"status": "upcoming", "daysLeft": 40, "kmLeft": 5000})).label;
    expect(due, startsWith("Termin za 40 dni · 5"));
    expect(due, endsWith("000 km"));
  });

  test("TechnicalCheck: a failed check derives no next date", () {
    final failed = TechnicalCheck.fromJson({
      "id": "t",
      "car": "c",
      "date": "2026-07-01T00:00:00Z",
      "result": "failed",
      "cost": 99.0,
      "expiry": {"state": "no_expiry", "daysUntilExpiry": null},
      "hasFile": false,
    });
    expect(failed.nextCheckDate, isNull);
    expect(failed.passed, isFalse);
  });

  test("Maintenance derived warranty + total", () {
    final m = MaintenanceEntry.fromJson({
      "id": "m",
      "car": "c",
      "date": "2026-07-01T00:00:00Z",
      "km": 1000,
      "type": "repair",
      "status": "completed",
      "laborCost": 100.0,
      "partsCost": 50.0,
      "totalCost": 150.0,
      "warrantyActive": true,
      "warrantyDaysLeft": 10,
      "hasFile": false,
    });
    expect(m.totalCost, 150.0);
    expect(warrantyStatus(m)!.label, "Gwarancja kończy się za 10 dni");
    expect(warrantyStatus(m)!.key, StatusKey.soon);

    final noWarranty = MaintenanceEntry.fromJson(
        {"id": "m", "car": "c", "date": "2026-07-01T00:00:00Z", "hasFile": false});
    expect(warrantyStatus(noWarranty), isNull);
  });

  test("money and numbers follow the chosen locale/currency", () {
    expect(formatMoney(1234.5).contains("zł"), isTrue);
    expect(formatMoney(null), "—");
    // An unsupported language must not throw — it can be set from the web.
    appSettings.locale = "rm-CH";
    expect(() => formatDate(DateTime(2026, 7, 17)), returnsNormally);
    expect(() => formatMoney(10), returnsNormally);
    expect(() => formatKm(15000), returnsNormally);
    appSettings.locale = "pl-PL";
  });

  test("Car carries the technical check interval", () {
    final car = Car.fromJson({"id": "c", "name": "Yaris", "technicalCheckIntervalDays": 730});
    expect(car.technicalCheckIntervalDays, 730);
  });

  test("ChargingSession keeps uncomputed derived fields null, not zero", () {
    final partial = ChargingSession.fromJson({
      "id": "a",
      "car": "c",
      "date": "2026-07-01T00:00:00Z",
      "km": 1000,
      "kwh": 22.5,
      "cost": 30.0,
      "fullCharge": false,
      "hasFile": false,
    });
    expect(partial.consumptionKwh100, isNull);
    expect(partial.distanceKm, isNull);
    expect(formatKwhConsumption(partial.consumptionKwh100), "—");
    expect(formatKmPerKwh(partial.kmPerKwh), "—");
    expect(formatKwh(partial.kwh), "22.50 kWh");

    final closed = ChargingSession.fromJson({
      "id": "b",
      "car": "c",
      "date": "2026-07-20T00:00:00Z",
      "km": 1400,
      "kwh": 60.0,
      "cost": 90.0,
      "fullCharge": true,
      "pricePerKwh": 1.5,
      "distanceKm": 400,
      "consumptionKwh100": 15.0,
      "kmPerKwh": 6.67,
    });
    expect(closed.consumptionKwh100, 15.0);
    expect(formatKwhConsumption(closed.consumptionKwh100), "15.0 kWh/100km");
  });

  test("ChargingStats leaves averages null when nothing is computable", () {
    final stats = ChargingStats.fromJson({
      "entries": 1,
      "totalKwh": 22.5,
      "totalCost": 30.0,
      "trackedDistanceKm": 0,
    });
    expect(stats.entries, 1);
    expect(stats.avgConsumptionKwh100, isNull);
    expect(formatKwhConsumption(stats.avgConsumptionKwh100), "—");
  });

  test("Car carries the provider link and the view arrangement", () {
    final car = Car.fromJson({
      "id": "c",
      "name": "bZ4X",
      "provider": "toyota",
      "providerVehicleId": "VIN123",
      "hiddenTabs": ["fuel"],
      "hiddenFields": ["differentialOil"],
      "tabOrder": ["info", "charging"],
      "fieldOrder": ["vin"],
      "metricOrder": ["evRange", "odometer"],
    });
    expect(car.provider, "toyota");
    expect(car.providerVehicleId, "VIN123");
    expect(car.hiddenTabs, ["fuel"]);
    expect(car.tabOrder, ["info", "charging"]);
    expect(car.metricOrder, ["evRange", "odometer"]);

    // A car nobody has arranged carries empty lists, not nulls — the callers
    // read them directly.
    final plain = Car.fromJson({"id": "d", "name": "Yaris"});
    expect(plain.provider, "");
    expect(plain.hiddenTabs, isEmpty);
    expect(plain.tabOrder, isEmpty);
  });

  test("arrangeKeys: partial orders keep every key, unknown ones are dropped", () {
    // The keys the stored order names lead; the rest follow in catalogue order,
    // which is what puts a tab added in a later release at the end of somebody's
    // page rather than in the middle of it.
    expect(
      arrangeKeys(kCarTabKeys, ["charging", "info"]).take(2).toList(),
      ["charging", "info"],
    );
    expect(arrangeKeys(kCarTabKeys, ["charging", "info"]).length, kCarTabKeys.length);
    expect(arrangeKeys(kCarTabKeys, ["charging", "info"]).toSet(), kCarTabKeys.toSet());

    // A key from a newer release, and a duplicate, are both ignored.
    final arranged = arrangeKeys(kCarTabKeys, ["tyres", "vin", "fuel", "fuel"]);
    expect(arranged.first, "fuel");
    expect(arranged.length, kCarTabKeys.length);

    // No arrangement at all means the catalogue's own order.
    expect(arrangeKeys(kCarInfoFieldKeys, const []), kCarInfoFieldKeys);
  });

  test("ProviderSnapshot: an unreachable provider parses as an answer, not a failure", () {
    final closed = ProviderSnapshot.fromJson({
      "provider": "toyota",
      "label": "MyToyota",
      "unavailable": true,
      "detail": "this vehicle is not on your MyToyota account",
    });
    expect(closed.unavailable, isTrue);
    expect(closed.vehicle, isNull);
    expect(closed.metrics, isEmpty);
    expect(closed.detail, contains("MyToyota"));

    final open = ProviderSnapshot.fromJson({
      "provider": "toyota",
      "label": "MyToyota",
      "fetchedAt": "2026-08-21T09:30:00Z",
      "vehicle": {"id": "VIN123", "vin": "VIN123", "name": "bZ4X", "make": "Toyota", "year": 2024},
      "metrics": [
        {"key": "odometer", "value": "16138", "unit": "km"},
        {"key": "batteryLevel", "value": "72", "unit": "%"},
      ],
      "sections": [
        {"id": "telemetry", "status": "ok", "fields": [{"key": "a.b", "value": "1"}]},
        {"id": "notifications", "status": "error", "error": "upstream said no"},
      ],
      "suggestedCurrentKm": 16138,
    });
    expect(open.vehicle!.subtitle, "Toyota 2024");
    expect(open.metrics.first.key, "odometer");
    expect(open.sections.last.status, "error");
    expect(open.sections.first.fields.single.key, "a.b");
    expect(open.suggestedCurrentKm, 16138);
    expect(open.fetchedAt, isNotNull);
  });

  // The car screen looks these up by key at render time — t("car.tabs.$key"),
  // t("enums.fuelType.$v") and the rest — so a missing entry is invisible to the
  // analyzer and shows up as a raw key path on the screen. Every catalogue the
  // UI iterates is checked here, in every language the app ships.
  group("every catalogue key has a label", () {
    void expectLabelled(String key) {
      for (final lang in translatedLanguages) {
        appSettings.locale = "$lang-${lang.toUpperCase()}";
        expect(t(key), isNot(key), reason: "$key is missing from $lang.json");
        expect(t(key).trim(), isNotEmpty, reason: "$key is blank in $lang.json");
      }
    }

    tearDown(() => appSettings.locale = "pl-PL");

    test("car tabs", () {
      for (final key in kCarTabKeys) {
        // "provider" has no key of its own by design: a linked car's tab is
        // named after the service ("MyToyota"), and an unlinked one falls back
        // to car.tabs.connected. Both apps label it that way.
        if (key == "provider") continue;
        expectLabelled("car.tabs.$key");
      }
      expectLabelled("car.tabs.connected");
    });

    test("Information rows", () {
      for (final key in kCarInfoFieldKeys) {
        expectLabelled("car.info.$key");
      }
      expectLabelled("car.info.technicalCheckInterval");
    });

    test("the delete dialog's per-collection counts", () {
      // Plural objects rather than plain strings, so they are checked through
      // the plural path instead of expectLabelled.
      for (final key in ["services", "maintenance", "fuel", "charging", "documents", "parts"]) {
        for (final lang in translatedLanguages) {
          appSettings.locale = "$lang-${lang.toUpperCase()}";
          final one = t("car.delete.$key", n: 1);
          final many = t("car.delete.$key", n: 5);
          expect(one, isNot("car.delete.$key"), reason: "car.delete.$key missing from $lang.json");
          expect(one, contains("1"));
          expect(many, contains("5"));
        }
      }
    });

    test("the enums the pickers and tiles share", () {
      for (final key in kFuelTypes) {
        expectLabelled("enums.fuelType.$key");
      }
      for (final key in ["repair", "inspection", "bodywork", "tyres", "diagnostics", "recall",
                         "warranty", "other"]) {
        expectLabelled("enums.maintenanceType.$key");
      }
      for (final key in ["scheduled", "in_progress", "completed"]) {
        expectLabelled("enums.maintenanceStatus.$key");
      }
      for (final key in ["insurance", "pollution", "registration", "inspection", "roadTax",
                         "warranty", "other"]) {
        expectLabelled("enums.documentType.$key");
      }
      for (final key in ["maintenance", "document", "service", "inspection", "other"]) {
        expectLabelled("enums.reminderType.$key");
      }
    });

    test("the roles the admin screen assigns", () {
      // Mirrors the roles in the API's users.go; the picker labels every one it
      // offers, including a superadmin's own role shown to an admin who cannot
      // assign it.
      for (final key in ["user", "admin", "superadmin"]) {
        expectLabelled("admin.roles.$key");
      }
    });

    test("the connected service's headline readings", () {
      // Mirrors headlineMetricSpecs + unmeasuredMetricKeys in the API's
      // vehicleproviders.go: every reading it can report needs a label here.
      for (final key in ["odometer", "fuelLevel", "fuelRange", "batteryLevel", "evRange",
                         "evRangeWithAc", "chargingStatus", "location"]) {
        expectLabelled("car.provider.metrics.$key");
      }
    });
  });

  test("no key is left behind in a translation", () {
    // Every key English has, the other languages have too. t() falls back to
    // English for a missing one, so a gap is invisible until someone reads a
    // half-translated screen — this is what makes it a test failure instead.
    final en = json.decode(
        File("assets/i18n/en.json").readAsStringSync()) as Map<String, dynamic>;

    List<String> flatten(Map<String, dynamic> tree, [String prefix = ""]) => [
          for (final e in tree.entries)
            if (e.value is Map<String, dynamic>)
              ...flatten(e.value as Map<String, dynamic>, "$prefix${e.key}.")
            else
              "$prefix${e.key}",
        ];

    dynamic lookup(Map<String, dynamic> tree, String key) {
      dynamic node = tree;
      for (final part in key.split(".")) {
        if (node is! Map || !node.containsKey(part)) return null;
        node = node[part];
      }
      return node;
    }

    final keys = flatten(en);
    expect(keys, isNotEmpty);
    for (final lang in translatedLanguages.where((l) => l != "en")) {
      final other = json.decode(
          File("assets/i18n/$lang.json").readAsStringSync()) as Map<String, dynamic>;
      final missing = keys.where((k) => lookup(other, k) == null).toList();
      expect(missing, isEmpty, reason: "$lang.json is missing ${missing.length} key(s)");
    }
  });

  test("a day count reads as prose in each language's own plural forms", () {
    appSettings.locale = "en-GB";
    expect(t("car.info.daysValue", n: 1), "1 day");
    expect(t("car.info.daysValue", n: 365), "365 days");
    // Polish splits one/few/many, which an English-style n==1 test would miss.
    appSettings.locale = "pl-PL";
    expect(t("car.info.daysValue", n: 1), "1 dzień");
    expect(t("car.info.daysValue", n: 365), "365 dni");
    appSettings.locale = "pl-PL";
  });

  test("ImportResult reads the server's per-collection counts", () {
    final res = ImportResult.fromJson(
        {"carsImported": 2, "servicesImported": 11, "partsImported": 4});
    expect(res.cars, 2);
    expect(res.services, 11);
    expect(res.parts, 4);
  });
}