import { expect, test } from "vitest";
import { parseExpressionString } from "./parse.ts";
import { ArrayQueryCollection } from "./query_collection.ts";
import { LuaEnv, LuaNativeJSFunction, LuaStackFrame } from "./runtime.ts";
import { Config } from "../config.ts";
import type { QueryCollationConfig } from "../../plug-api/types/config.ts";

function configWithCollation(collation: QueryCollationConfig): Config {
  const config = new Config();
  config.set("queryCollation", collation);
  return config;
}

test("ArrayQueryCollection", async () => {
  const rootEnv = new LuaEnv();
  rootEnv.setLocal(
    "build_name",
    new LuaNativeJSFunction((a, b) => {
      return Promise.resolve(`${a} ${b}`);
    }),
  );

  const collection = new ArrayQueryCollection([
    { x: 1, y: 1 },
    { x: 2, y: 2 },
    {
      x: 3,
      y: 3,
    },
  ]);
  const result = await collection.query(
    {
      objectVariable: "p",
      where: parseExpressionString("p.x >= 2"),
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  // console.log(result);
  expect(result.length === 2).toBeTruthy();

  // Test limit
  const result2 = await collection.query(
    {
      objectVariable: "p",
      limit: 1,
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(result2.length === 1).toBeTruthy();
  expect(result2[0].x === 1).toBeTruthy();

  // Test offset
  const result3 = await collection.query(
    {
      objectVariable: "p",
      offset: 1,
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(result3.length === 2).toBeTruthy();
  expect(result3[0].x === 2).toBeTruthy();

  // Test order by
  const result4 = await collection.query(
    {
      objectVariable: "p",
      orderBy: [{ expr: parseExpressionString("p.x"), desc: false }],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(result4.length === 3).toBeTruthy();
  expect(result4[0].x === 1).toBeTruthy();
  expect(result4[1].x === 2).toBeTruthy();
  expect(result4[2].x === 3).toBeTruthy();

  // Test order by desc
  const result5 = await collection.query(
    {
      objectVariable: "p",
      orderBy: [{ expr: parseExpressionString("p.x"), desc: true }],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(result5.length === 3).toBeTruthy();
  expect(result5[0].x === 3).toBeTruthy();
  expect(result5[1].x === 2).toBeTruthy();
  expect(result5[2].x === 1).toBeTruthy();

  // Test order by multiple fields
  const collection2 = new ArrayQueryCollection([
    { firstName: "John", lastName: "Doe" },
    { firstName: "Alice", lastName: "Johnson" },
    { firstName: "Jane", lastName: "Doe" },
    { firstName: "Bob", lastName: "Johnson" },
  ]);
  const result6 = await collection2.query(
    {
      objectVariable: "p",
      orderBy: [
        { expr: parseExpressionString("p.lastName"), desc: false },
        { expr: parseExpressionString("p.firstName"), desc: true },
      ],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(result6[0].firstName).toEqual("John");
  expect(result6[0].lastName).toEqual("Doe");
  expect(result6[1].firstName).toEqual("Jane");
  expect(result6[1].lastName).toEqual("Doe");
  expect(result6[2].firstName).toEqual("Bob");
  expect(result6[2].lastName).toEqual("Johnson");
  expect(result6[3].firstName).toEqual("Alice");
  expect(result6[3].lastName).toEqual("Johnson");

  // Test select with expression
  const result8 = await collection2.query(
    {
      objectVariable: "p",
      select: parseExpressionString("p.firstName .. ' ' .. p.lastName"),
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(result8[0]).toEqual("John Doe");
  expect(result8[1]).toEqual("Alice Johnson");
  expect(result8[2]).toEqual("Jane Doe");
  expect(result8[3]).toEqual("Bob Johnson");

  // Test select with native function and implicit object variable
  const result9 = await collection2.query(
    {
      select: parseExpressionString("build_name(firstName, lastName)"),
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(result9[0]).toEqual("John Doe");
  expect(result9[1]).toEqual("Alice Johnson");
  expect(result9[2]).toEqual("Jane Doe");
  expect(result9[3]).toEqual("Bob Johnson");

  // Test distinct
  const collectionWithDuplicates = new ArrayQueryCollection([
    { category: "fruit", name: "apple" },
    { category: "vegetable", name: "carrot" },
    { category: "fruit", name: "banana" },
    { category: "fruit", name: "apple" }, // Duplicate
    { category: "vegetable", name: "spinach" },
    { category: "fruit", name: "banana" }, // Duplicate
  ]);

  // Test distinct with select
  const distinctResult = await collectionWithDuplicates.query(
    {
      objectVariable: "item",
      select: parseExpressionString("item.category"),
      distinct: true,
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(distinctResult.length).toEqual(2);
  expect(distinctResult.includes("fruit")).toEqual(true);
  expect(distinctResult.includes("vegetable")).toEqual(true);

  // Test distinct with objects
  const distinctObjectsResult = await collectionWithDuplicates.query(
    {
      objectVariable: "item",
      select: parseExpressionString(
        "{ category = item.category, name = item.name }",
      ),
      distinct: true,
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(distinctObjectsResult.length).toEqual(4);

  // Test string sorting (collation) with example from MDN
  const letterCollection = new ArrayQueryCollection([
    { letter: "Z" },
    { letter: "z" },
    { letter: "ä" },
    { letter: "a" },
  ]);

  // Default ordering by codepoint
  const resultCodepoint = await letterCollection.query(
    {
      objectVariable: "item",
      orderBy: [{ expr: parseExpressionString("item.letter"), desc: false }],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
    configWithCollation({ enabled: false }),
  );
  expect(resultCodepoint[0].letter).toEqual("Z");
  expect(resultCodepoint[1].letter).toEqual("a");
  expect(resultCodepoint[2].letter).toEqual("z");
  expect(resultCodepoint[3].letter).toEqual("ä");

  // Defaults for German
  const resultGerman = await letterCollection.query(
    {
      objectVariable: "item",
      orderBy: [{ expr: parseExpressionString("item.letter"), desc: false }],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
    configWithCollation({ enabled: true, locale: "de" }),
  );
  expect(resultGerman[0].letter).toEqual("a");
  expect(resultGerman[1].letter).toEqual("ä");
  expect(resultGerman[2].letter).toEqual("z");
  expect(resultGerman[3].letter).toEqual("Z");

  // Defaults for Swedish
  const resultSwedish = await letterCollection.query(
    {
      objectVariable: "item",
      orderBy: [{ expr: parseExpressionString("item.letter"), desc: false }],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
    configWithCollation({ enabled: true, locale: "sv" }),
  );
  expect(resultSwedish[0].letter).toEqual("a");
  expect(resultSwedish[1].letter).toEqual("z");
  expect(resultSwedish[2].letter).toEqual("Z");
  expect(resultSwedish[3].letter).toEqual("ä");

  // Uppercase first
  const resultUpper = await letterCollection.query(
    {
      objectVariable: "item",
      orderBy: [{ expr: parseExpressionString("item.letter"), desc: false }],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
    configWithCollation({
      enabled: true,
      locale: "de",
      options: { caseFirst: "upper" },
    }),
  );
  expect(resultUpper[0].letter).toEqual("a");
  expect(resultUpper[1].letter).toEqual("ä");
  expect(resultUpper[2].letter).toEqual("Z");
  expect(resultUpper[3].letter).toEqual("z");
});

test("ArrayQueryCollection - nulls ordering", async () => {
  const rootEnv = new LuaEnv();

  const collection = new ArrayQueryCollection([
    { name: "alice", priority: 10 },
    { name: "bob", priority: undefined },
    { name: "carol", priority: 50 },
    { name: "dave", priority: undefined },
    { name: "eve", priority: 1 },
  ]);

  // Default: asc nulls last
  const r1 = await collection.query(
    {
      objectVariable: "p",
      orderBy: [{ expr: parseExpressionString("p.priority"), desc: false }],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(r1[0].name).toBe("eve");
  expect(r1[1].name).toBe("alice");
  expect(r1[2].name).toBe("carol");
  expect(r1[3].priority).toBeUndefined();
  expect(r1[4].priority).toBeUndefined();

  // Default: desc nulls first
  const r2 = await collection.query(
    {
      objectVariable: "p",
      orderBy: [{ expr: parseExpressionString("p.priority"), desc: true }],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(r2[0].priority).toBeUndefined();
  expect(r2[1].priority).toBeUndefined();
  expect(r2[2].name).toBe("carol");
  expect(r2[3].name).toBe("alice");
  expect(r2[4].name).toBe("eve");

  // Explicit: desc nulls last
  const r3 = await collection.query(
    {
      objectVariable: "p",
      orderBy: [
        {
          expr: parseExpressionString("p.priority"),
          desc: true,
          nulls: "last",
        },
      ],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(r3[0].name).toBe("carol");
  expect(r3[1].name).toBe("alice");
  expect(r3[2].name).toBe("eve");
  expect(r3[3].priority).toBeUndefined();
  expect(r3[4].priority).toBeUndefined();

  // Explicit: asc nulls first
  const r4 = await collection.query(
    {
      objectVariable: "p",
      orderBy: [
        {
          expr: parseExpressionString("p.priority"),
          desc: false,
          nulls: "first",
        },
      ],
    },
    rootEnv,
    LuaStackFrame.lostFrame,
  );
  expect(r4[0].priority).toBeUndefined();
  expect(r4[1].priority).toBeUndefined();
  expect(r4[2].name).toBe("eve");
  expect(r4[3].name).toBe("alice");
  expect(r4[4].name).toBe("carol");
});

test("ArrayQueryCollection - SWO violation detection", async () => {
  const rootEnv = new LuaEnv();
  rootEnv.setLocal("badCmp", new LuaNativeJSFunction((a, b) => a <= b));

  const collection = new ArrayQueryCollection([
    { name: "alice", score: 10 },
    { name: "bob", score: 10 },
    { name: "carol", score: 5 },
  ]);

  await expect(
    collection.query(
      {
        objectVariable: "p",
        orderBy: [
          {
            expr: parseExpressionString("p.score"),
            desc: false,
            using: "badCmp",
          },
        ],
      },
      rootEnv,
      LuaStackFrame.lostFrame,
    ),
  ).rejects.toThrow("strict weak ordering");
});