import { describe, expect, it } from "vitest";
import { classifyMail } from "@/services/parse/classify";
import { parsePackingListBuffer } from "@/services/parse/packing-list";
import { parseMailSource } from "@/services/imap/snapshot";
import { decidePull } from "@/services/imap/pull-filter";
import { resolveNoSpreadsheetOutcome } from "@/services/parse/pipeline";
import { resolveParsedMailBody } from "@/utils/mail-body-text";
import {
  fixtureFilenames,
  loadAllEmailFixtures,
  loadEmailFixture,
} from "@/services/test/email-fixture-library";

function spreadsheetRank(filename: string): number {
  const f = filename || "";
  if (/数据模版|提拆派|卡派资料|卡派清单|装箱清单|packing/i.test(f)) return 0;
  if (/换标|覆盖贴|贴标|操作指令/i.test(f)) return 2;
  return 1;
}

function pickSpreadsheet(filenames: string[]): string | null {
  const sheets = filenames
    .filter((f) => /\.(xlsx|xls|csv|zip)$/i.test(f))
    .slice()
    .sort((a, b) => spreadsheetRank(a) - spreadsheetRank(b) || a.localeCompare(b));
  return sheets[0] || null;
}

describe("email fixture catalog", () => {
  it("covers >=15 fixtures and all required categories", async () => {
    const all = await loadAllEmailFixtures();
    expect(all.length).toBeGreaterThanOrEqual(15);
    const cats = new Set(all.map((f) => f.spec.category));
    expect(cats.has("normal")).toBe(true);
    expect(cats.has("boundary")).toBe(true);
    expect(cats.has("abnormal")).toBe(true);
    expect(cats.has("duplicate")).toBe(true);
    expect(cats.has("multi_attachment")).toBe(true);
    for (const f of all) {
      expect(f.expected.mail_type).toBeTruthy();
      expect(f.expected.status).toBeTruthy();
      expect(f.spec.messageId).toBeTruthy();
    }
  });

  it("classifyMail matches expected.mail_type (except pull-skipped unknown)", async () => {
    const all = await loadAllEmailFixtures();
    for (const f of all) {
      if (f.expected.pull === false) {
        const d = decidePull({
          fromAddr: f.spec.from,
          subject: f.spec.subject,
          body: f.spec.text,
          filenames: fixtureFilenames(f.spec),
          rules: [],
        });
        expect(d.pull, f.id).toBe(false);
        expect(f.expected.mail_type).toBe("UNKNOWN");
        continue;
      }
      const evidence = classifyMail({
        subject: f.spec.subject,
        body: f.spec.text,
        filenames: fixtureFilenames(f.spec),
      });
      expect(evidence.mail_type, f.id).toBe(f.expected.mail_type);
    }
  });

  it("packing fixtures: parsePackingListBuffer === expected shipments", async () => {
    const ids = [
      "01-normal-forecast",
      "13-illegal-date",
      "12-missing-required",
    ];
    for (const id of ids) {
      const f = await loadEmailFixture(id);
      const xlsx = f.attachments.find((a) => a.filename.endsWith(".xlsx"));
      expect(xlsx, id).toBeTruthy();
      const parsed = await parsePackingListBuffer(xlsx!.content, {
        enableIsoCheck: true,
      });
      if (f.expected.missing_columns) {
        expect(parsed.errorCode, id).toBe("PARSE_FAILED");
        expect(parsed.lineage.missing_columns, id).toBeTruthy();
        continue;
      }
      expect(parsed.errorCode, id).toBeUndefined();
      if (f.expected.shipment_count != null) {
        expect(parsed.shipments.length, id).toBe(f.expected.shipment_count);
      }
      if (f.expected.shipments) {
        for (let i = 0; i < f.expected.shipments.length; i++) {
          const exp = f.expected.shipments[i];
          const row = parsed.shipments[i];
          if (exp.F_FBACode != null) expect(row.F_FBACode, id).toBe(exp.F_FBACode);
          if (exp.F_Transporter != null) {
            expect(row.F_Transporter, id).toBe(exp.F_Transporter);
          }
          if (exp.F_CTNS != null) expect(row.F_CTNS, id).toBe(exp.F_CTNS);
          if (exp.row_status) expect(row.row_status, id).toBe(exp.row_status);
          if (exp.F_Expected_DeliveryDateB === null) {
            expect(row.F_Expected_DeliveryDateB ?? null, id).toBeNull();
          }
        }
      }
    }
  });

  it("07-gbk-body: mailparser decodes 新增预报", async () => {
    const f = await loadEmailFixture("07-gbk-body");
    const parsed = await parseMailSource(f.eml);
    const body = resolveParsedMailBody(parsed);
    expect(body).toMatch(/新增预报/);
    expect(parsed.subject).toMatch(/WHSU8127240/);
  });

  it("08-oversized-attachment exceeds 20MB", async () => {
    const f = await loadEmailFixture("08-oversized-attachment");
    expect(f.attachments[0].content.length).toBeGreaterThan(20 * 1024 * 1024);
    expect(f.expected.last_error).toBe("ATTACHMENT_TOO_LARGE");
  });

  it("09/11 no-spreadsheet outcomes match expected status", async () => {
    const noAtt = await loadEmailFixture("09-no-attachment");
    expect(
      resolveNoSpreadsheetOutcome({
        mailType: noAtt.expected.mail_type,
        hasAttachments: false,
      }),
    ).toEqual({
      status: noAtt.expected.status,
      lastError: noAtt.expected.last_error,
    });
    const wrong = await loadEmailFixture("11-wrong-format");
    expect(
      resolveNoSpreadsheetOutcome({
        mailType: wrong.expected.mail_type,
        hasAttachments: true,
      }),
    ).toEqual({
      status: wrong.expected.status,
      lastError: wrong.expected.last_error,
    });
  });

  it("14-duplicate-pull shares Message-ID with 01", async () => {
    const a = await loadEmailFixture("01-normal-forecast");
    const b = await loadEmailFixture("14-duplicate-pull");
    expect(b.spec.messageId).toBe(a.spec.messageId);
    expect(b.expected.idempotent_with).toBe("01-normal-forecast");
  });

  it("15-multi-attachment classifies WORK_ORDER but still selects 数据模版 over 换标 xlsx", async () => {
    const f = await loadEmailFixture("15-multi-attachment");
    const names = fixtureFilenames(f.spec);
    expect(names.length).toBeGreaterThan(2);
    expect(pickSpreadsheet(names)).toBe(f.expected.selected_attachment);
  });
});