import assert from "node:assert/strict";
import { describe, it } from "node:test";
import {
  extractEmail,
  parseForwardedHeader,
  resolveOriginal,
  subjectMatches,
} from "../src/lib/email.js";
import { matchRule } from "../src/handlers/match-rule.js";
import {
  briTransferDirectBody,
  briTransferForwardedBody,
  grabBody,
  grabForwardedBody,
  livinDirectBody,
  livinForwardedBody,
} from "./fixtures.js";

const silentLog = {
  info() {},
  warn() {},
  error() {},
};

describe("extractEmail", () => {
  it("parses angle-bracket addresses", () => {
    assert.equal(
      extractEmail(`"Livin'" <noreply.livin@bankmandiri.co.id>`),
      "noreply.livin@bankmandiri.co.id",
    );
  });
});

describe("parseForwardedHeader", () => {
  it("reads original From/Subject from a Fwd block", () => {
    const h = parseForwardedHeader(livinForwardedBody);
    assert.ok(h);
    assert.match(h.from, /noreply\.livin@bankmandiri\.co\.id/);
    assert.equal(h.subject, "Pembayaran Berhasil!");
  });

  it("returns null when there is no Fwd block", () => {
    assert.equal(parseForwardedHeader(livinDirectBody), null);
  });
});

describe("resolveOriginal", () => {
  it("uses envelope for direct mail", () => {
    const o = resolveOriginal({
      from: `"Livin'" <noreply.livin@bankmandiri.co.id>`,
      subject: "Pembayaran Berhasil!",
      date: "Sun, 13 Sep 2026 14:48:36 +0700 (WIB)",
      body: livinDirectBody,
    });
    assert.equal(o.viaForward, false);
    assert.equal(extractEmail(o.from), "noreply.livin@bankmandiri.co.id");
  });

  it("uses Fwd header for forwarded mail", () => {
    const o = resolveOriginal({
      from: "NSRB <nasyarobby@gmail.com>",
      subject: "Fwd: Your Grab E-Receipt",
      body: grabForwardedBody,
    });
    assert.equal(o.viaForward, true);
    assert.equal(extractEmail(o.from), "no-reply@grab.com");
    assert.equal(o.subject, "Your Grab E-Receipt");
  });
});

describe("subjectMatches", () => {
  it("matches exact and Fwd-prefixed subjects", () => {
    assert.equal(subjectMatches("Pembayaran Berhasil!", "Pembayaran Berhasil!"), true);
    assert.equal(subjectMatches("Fwd: Pembayaran Berhasil!", "Pembayaran Berhasil!"), true);
    assert.equal(subjectMatches("Hello", "Pembayaran Berhasil!"), false);
  });
});

describe("matchRule", () => {
  it("matches direct Livin", async () => {
    const result = await matchRule({
      messageId: "1a099bd61efd234d",
      log: silentLog,
      message: {
        from: `"Livin'" <noreply.livin@bankmandiri.co.id>`,
        subject: "Pembayaran Berhasil!",
        date: "Sun, 13 Sep 2026 14:48:36 +0700 (WIB)",
        body: livinDirectBody,
      },
    });
    assert.equal(result.pass.rule.kind, "livin.qr_payment.success");
  });

  it("matches forwarded Livin via original header", async () => {
    const result = await matchRule({
      messageId: "1a099b0c04c4397a",
      log: silentLog,
      message: {
        from: "NSRB <nasyarobby@gmail.com>",
        subject: "Fwd: Pembayaran Berhasil!",
        body: livinForwardedBody,
      },
    });
    assert.equal(result.pass.rule.kind, "livin.qr_payment.success");
  });

  it("matches direct Grab", async () => {
    const result = await matchRule({
      messageId: "grab-direct",
      log: silentLog,
      message: {
        from: "Grab <no-reply@grab.com>",
        subject: "Your Grab E-Receipt",
        body: grabBody,
      },
    });
    assert.equal(result.pass.rule.kind, "grab.ereceipt.ride");
  });

  it("matches forwarded Grab via original header", async () => {
    const result = await matchRule({
      messageId: "1a099b8b9d239e5e",
      log: silentLog,
      message: {
        from: "NSRB <nasyarobby@gmail.com>",
        subject: "Fwd: Your Grab E-Receipt",
        body: grabForwardedBody,
      },
    });
    assert.equal(result.pass.rule.kind, "grab.ereceipt.ride");
  });

  it("matches direct BRI transfer", async () => {
    const result = await matchRule({
      messageId: "bri-direct",
      log: silentLog,
      message: {
        from: "Bank BRI <BankBRI@bri.co.id>",
        subject: "Pemindahan Dana Sesama Rekening BRI",
        body: briTransferDirectBody,
      },
    });
    assert.equal(result.pass.rule.kind, "bri.transfer.success");
  });

  it("matches forwarded BRI transfer via original header", async () => {
    const result = await matchRule({
      messageId: "1a09b6cd9a3bc6bd",
      log: silentLog,
      message: {
        from: "Nasyarobby Putra <nsrb@bu.edu>",
        subject: "Fwd: Pemindahan Dana Sesama Rekening BRI",
        body: briTransferForwardedBody,
      },
    });
    assert.equal(result.pass.rule.kind, "bri.transfer.success");
  });

  it("breaks on unknown from/subject", async () => {
    const result = await matchRule({
      messageId: "x",
      log: silentLog,
      message: {
        from: "Someone <other@example.com>",
        subject: "Hello",
        body: "hi",
      },
    });
    assert.equal(result.break, true);
  });
});