import assert from "node:assert/strict";
import test from "node:test";

import * as campaignForm from "../lib/campaign-form";

type CampaignFormModule = {
  campaignFormSchema: {
    safeParse: (value: unknown) => {
      success: boolean;
      data?: Record<string, unknown>;
      error?: {
        flatten?: () => { fieldErrors: Record<string, string[] | undefined> };
        issues?: Array<{
          path?: Array<string | number>;
          message?: string;
        }>;
      };
    };
  };
  mapCampaignFormToPayload: (values: Record<string, unknown>) => Record<string, unknown>;
};

type ErrorLike = CampaignFormModule["campaignFormSchema"]["safeParse"] extends (
  value: unknown,
) => infer Result
  ? Result
  : never;

const formModule = campaignForm as unknown as CampaignFormModule;

function toString(value: unknown): string | undefined {
  return typeof value === "string" ? value : undefined;
}

function extractFieldMessages(
  result: ErrorLike,
  field: string,
): string[] {
  const messages: string[] = [];
  const flatten = result.error?.flatten?.();
  const flattenedMessages = flatten?.fieldErrors?.[field];

  if (flattenedMessages && Array.isArray(flattenedMessages)) {
    for (const message of flattenedMessages) {
      if (typeof message === "string" && message.length > 0) {
        messages.push(message);
      }
    }
  }

  for (const issue of result.error?.issues ?? []) {
    const isTargetField = issue.path?.at(-1) === field;
    if (
      isTargetField &&
      typeof issue.message === "string" &&
      issue.message.length > 0
    ) {
      messages.push(issue.message);
    }
  }

  if (messages.length === 0) {
    const fallback = JSON.stringify(result.error);
    if (fallback.length > 2) {
      messages.push(fallback);
    }
  }

  return messages;
}

function createMinimalValidForm(overrides: Record<string, unknown> = {}) {
  return {
    name: "Malerbetrieb Konstruktiv",
    categoryMode: "preset",
    category: "Maler",
    customSearchTerm: "",
    postalCode: "79098",
    radiusKm: 10,
    maxNewLeadsPerRun: 5,
    maxAuditsPerRun: 5,
    recurrence: "daily",
    status: "active",
    ...overrides,
  };
}

test("valid minimal campaign form maps to a Germany-only payload", () => {
  const schemaResult = formModule.campaignFormSchema.safeParse(
    createMinimalValidForm(),
  );

  assert.equal(schemaResult.success, true);
  const payload = formModule.mapCampaignFormToPayload(
    schemaResult.data as Record<string, unknown>,
  ) as Record<string, unknown>;
  const germanyIndicators = [
    payload.countryCode,
    payload.country,
    payload.region,
  ];

  const hasGermany = germanyIndicators.some((value) => {
    const normalized = toString(value)?.toLowerCase();
    return (
      normalized === "de" ||
      normalized === "deutschland" ||
      normalized?.includes("deutschland")
    );
  });

  assert.equal(
    hasGermany,
    true,
    "Mapped payload should enforce Germany-only context",
  );
});

test("German PLZ validation enforces exactly five digits with clear German feedback", () => {
  const schema = formModule.campaignFormSchema;
  const invalidPostcodes = [
    "",
    "1234",
    "123456",
    "abcde",
    "12 34",
  ];

  for (const postalCode of invalidPostcodes) {
    const result = schema.safeParse(createMinimalValidForm({ postalCode }));

    assert.equal(result.success, false);
    const messages = extractFieldMessages(result as ErrorLike, "postalCode");
    assert.ok(messages.length > 0, "Expected a validation message for postal code");

    const messageText = messages.join(" ");
    assert.match(
      messageText,
      /PLZ|Postleitzahl/i,
      `Expected postal-code message in German semantics, got: ${messageText}`,
    );
    assert.match(
      messageText,
      /5|fünf|5-stellig|stellig/i,
      `Expected explicit five-digit guidance, got: ${messageText}`,
    );
  }
});

test("predefined categories do not require custom niche input", () => {
  const preset = createMinimalValidForm({
    categoryMode: "preset",
    category: "Maler",
    customSearchTerm: "",
  });

  const result = formModule.campaignFormSchema.safeParse(preset);

  assert.equal(result.success, true, "Predefined category should parse without custom term");
});

test("Anderes/custom category requires a non-empty custom niche field", () => {
  const anderes = formModule.campaignFormSchema.safeParse(
    createMinimalValidForm({
      categoryMode: "custom",
      category: "Anderes",
      customSearchTerm: "",
    }),
  );
  assert.equal(anderes.success, false);
  const messages = extractFieldMessages(anderes as ErrorLike, "customSearchTerm");
  assert.ok(messages.length > 0, "Expected a validation message for missing custom term");

  const messageText = messages.join(" ");
  assert.match(
    messageText,
    /Anderes|eigene|benötigt|erforderlich|muss/i,
    `Expected explicit guidance for Anderes custom term, got: ${messageText}`,
  );
});

test("radius and lead/audit limits reject invalid zero, negative, and out-of-range values", () => {
  const schema = formModule.campaignFormSchema;
  const fieldLimits: Array<{ field: "radiusKm" | "maxNewLeadsPerRun" | "maxAuditsPerRun"; invalid: number[] }> = [
    { field: "radiusKm", invalid: [0, -1, 10000] },
    { field: "maxNewLeadsPerRun", invalid: [0, -1, 10000] },
    { field: "maxAuditsPerRun", invalid: [0, -1, 10000] },
  ];

  for (const { field, invalid } of fieldLimits) {
    for (const value of invalid) {
      const values = createMinimalValidForm({ [field]: value });
      const result = schema.safeParse(values);

      assert.equal(result.success, false);
      const messages = extractFieldMessages(result as ErrorLike, field);
      assert.ok(
        messages.length > 0,
        `Expected validation for invalid value on ${field}: ${value}`,
      );

      const messageText = messages.join(" ");
      assert.match(
        messageText,
        /muss|mindestens|zwischen|gültig|positiv/i,
        `Expected German limit/range explanation for ${field}, got: ${messageText}`,
      );
    }
  }
});

test("radius and lead/audit limits reject decimal values", () => {
  const schema = formModule.campaignFormSchema;
  const fieldLimits: Array<{ field: "radiusKm" | "maxNewLeadsPerRun" | "maxAuditsPerRun"; invalid: number[] }> = [
    { field: "radiusKm", invalid: [10.5, 0.1, 12.99] },
    { field: "maxNewLeadsPerRun", invalid: [1.9, 5.25] },
    { field: "maxAuditsPerRun", invalid: [0.01, 2.75] },
  ];

  for (const { field, invalid } of fieldLimits) {
    for (const value of invalid) {
      const values = createMinimalValidForm({ [field]: value });
      const result = schema.safeParse(values);

      assert.equal(result.success, false);
      const messages = extractFieldMessages(result as ErrorLike, field);
      assert.ok(
        messages.length > 0,
        `Expected validation for decimal value on ${field}: ${value}`,
      );

      const messageText = messages.join(" ");
      assert.match(
        messageText,
        /Ganzzahl|ganze|integer|Nachkommastellen|dezim|komma/i,
        `Expected decimal-rejection guidance for ${field}, got: ${messageText}`,
      );
    }
  }
});

test("recurrence/cadence only accepts manual, daily, weekly, monthly", () => {
  const schema = formModule.campaignFormSchema;
  const validValues = ["manual", "daily", "weekly", "monthly"] as const;
  const invalidValues = ["hourly", "biweekly", "yearly", ""] as const;

  for (const recurrence of validValues) {
    const valid = schema.safeParse(createMinimalValidForm({ recurrence }));
    assert.equal(valid.success, true, `Expected recurrence ${recurrence} to parse`);
  }

  for (const recurrence of invalidValues) {
    const invalid = schema.safeParse(createMinimalValidForm({ recurrence }));
    assert.equal(invalid.success, false, `Expected recurrence ${recurrence} to be rejected`);

    const messages = extractFieldMessages(invalid as ErrorLike, "recurrence");
    assert.ok(messages.length > 0);
    const messageText = messages.join(" ");
    assert.match(
      messageText,
      /manuell|täglich|wöchentlich|monatlich|Auswahl|gültig/i,
      `Expected actionable German cadence guidance, got: ${messageText}`,
    );
  }
});