import assert from "node:assert/strict";
import test from "node:test";
import { fetchAllH2BiDrill, fetchAllH2BiDrillRecords } from "./api";
import type { H2BiDrillResponse } from "./types";

const query = {
  year: 2026,
  vehicleScope: "all" as const,
  verifyScope: "all" as const,
};

function response(overrides: Partial<H2BiDrillResponse> = {}): H2BiDrillResponse {
  return {
    groupBy: "station",
    amountScope: "all",
    filters: {},
    summary: {},
    groups: [],
    records: [],
    page: { page: 1, pageSize: 2, hasMore: false },
    ...overrides,
  };
}

async function withFetch(
  handler: (url: URL) => H2BiDrillResponse | Promise<H2BiDrillResponse>,
  run: () => Promise<void>,
) {
  const original = globalThis.fetch;
  globalThis.fetch = (async (input: string | URL | Request) => {
    const url = new URL(String(input), "http://ln-bi.local");
    return new Response(JSON.stringify(await handler(url)), { status: 200 });
  }) as typeof fetch;
  try {
    await run();
  } finally {
    globalThis.fetch = original;
  }
}

test("完整分组读取跨页，并以短页而非旧服务 hasMore 字段确认结束", async () => {
  const pages: number[] = [];
  await withFetch((url) => {
    const page = Number(url.searchParams.get("page"));
    pages.push(page);
    return response({
      groups: page === 1
        ? ["甲", "乙"].map((name, index) => ({ id: String(index), name, province: null, city: null, recordCount: 1, stationCount: 1, customerCount: 1, kg: 1, cost: 1, revenue: 1, lingniuKg: 1, externalKg: 0 }))
        : [{ id: "3", name: "丙", province: null, city: null, recordCount: 1, stationCount: 1, customerCount: 1, kg: 1, cost: 1, revenue: 1, lingniuKg: 1, externalKg: 0 }],
    });
  }, async () => {
    const result = await fetchAllH2BiDrill({ ...query, groupBy: "station" }, { pageSize: 2 });
    assert.deepEqual(result.groups.map((row) => row.name), ["甲", "乙", "丙"]);
    assert.equal(result.page.complete, true);
    assert.equal(result.page.pagesRead, 2);
  });
  assert.deepEqual(pages, [1, 2]);
});

test("完整记录读取跨页后保留全部订单", async () => {
  await withFetch((url) => {
    const page = Number(url.searchParams.get("page"));
    return response({
      groupBy: "record",
      records: page === 1
        ? [{ id: "a" }, { id: "b" }]
        : [{ id: "c" }],
    });
  }, async () => {
    const result = await fetchAllH2BiDrillRecords(query, { pageSize: 2 });
    assert.deepEqual(result.records.map((row) => row.id), ["a", "b", "c"]);
    assert.equal(result.page.hasMore, false);
  });
});

test("全量读取在中途请求失败时拒绝，不返回部分结果", async () => {
  const original = globalThis.fetch;
  globalThis.fetch = (async (input: string | URL | Request) => {
    const page = new URL(String(input), "http://ln-bi.local").searchParams.get("page");
    if (page === "2") return new Response("failed", { status: 502, statusText: "Bad Gateway" });
    return new Response(JSON.stringify(response({
      groups: ["甲", "乙"].map((name, index) => ({ id: String(index), name, province: null, city: null, recordCount: 1, stationCount: 1, customerCount: 1, kg: 1, cost: 1, revenue: 1, lingniuKg: 1, externalKg: 0 })),
    })), { status: 200 });
  }) as typeof fetch;
  try {
    await assert.rejects(
      fetchAllH2BiDrill({ ...query, groupBy: "station" }, { pageSize: 2 }),
      /API error: 502/,
    );
  } finally {
    globalThis.fetch = original;
  }
});

test("空结果是完整结果而不是加载失败", async () => {
  await withFetch(() => response(), async () => {
    const result = await fetchAllH2BiDrill({ ...query, groupBy: "station" });
    assert.deepEqual(result.groups, []);
    assert.equal(result.page.pagesRead, 1);
  });
});

test("取消的全量读取不会发起请求或生成部分数据", async () => {
  const controller = new AbortController();
  controller.abort();
  await assert.rejects(
    fetchAllH2BiDrill({ ...query, groupBy: "station" }, { signal: controller.signal }),
    (error: Error) => error.name === "AbortError",
  );
});

test("全量读取在第一页完成后也会响应取消，不会请求下一页", async () => {
  const controller = new AbortController();
  let calls = 0;
  await withFetch(() => {
    calls += 1;
    controller.abort();
    return response({
      groups: ["甲", "乙"].map((name, index) => ({ id: String(index), name, province: null, city: null, recordCount: 1, stationCount: 1, customerCount: 1, kg: 1, cost: 1, revenue: 1, lingniuKg: 1, externalKg: 0 })),
    });
  }, async () => {
    await assert.rejects(
      fetchAllH2BiDrill({ ...query, groupBy: "station" }, { signal: controller.signal, pageSize: 2 }),
      (error: Error) => error.name === "AbortError",
    );
  });
  assert.equal(calls, 1);
});

test("maxRows 和 maxPages 均拒绝不完整的全量读取", async () => {
  await withFetch(() => response({
    groups: ["甲", "乙"].map((name, index) => ({ id: String(index), name, province: null, city: null, recordCount: 1, stationCount: 1, customerCount: 1, kg: 1, cost: 1, revenue: 1, lingniuKg: 1, externalKg: 0 })),
  }), async () => {
    await assert.rejects(
      fetchAllH2BiDrill({ ...query, groupBy: "station" }, { pageSize: 2, maxRows: 1 }),
      /超过 1 条保护上限/,
    );
    await assert.rejects(
      fetchAllH2BiDrill({ ...query, groupBy: "station" }, { pageSize: 2, maxPages: 1 }),
      /超过 1 页保护上限/,
    );
  });
});