import { describe, expect, it } from "vitest";

import type { Portfolio } from "@/entities/portfolio";

import {
	formatPositionReturnPercent,
	toAccountPagePositionSections,
	toUnrealizedReturns,
} from "./positions";
import { portfolio, position, second } from "./positions.fixtures";

function makePosition(
	overrides: Partial<Portfolio["positions"][number]>,
): Portfolio["positions"][number] {
	return { ...position, ...overrides };
}

function sections(positions: Portfolio["positions"]) {
	return toAccountPagePositionSections({
		...portfolio,
		positions,
	});
}

describe("account position sections", () => {
	it("excludes currency instruments only from display, preserving order and share denominators", () => {
		const otherTypes = [
			"OPTION",
			"OTHER",
			"FUTURE",
			"STRUCTURED_NOTE",
			"DIGITAL_FINANCIAL_ASSET",
			"FUND",
		] as const;

		const snapshot: Portfolio = {
			...portfolio,
			cashBalances: [{ currency: "RUB", value: "1000" }],
			positions: [
				...portfolio.positions,
				{
					...portfolio.positions[0],
					currentValue: { currency: "RUB", value: "50" },
					figi: "FIGI-CURRENCY",
					type: "CURRENCY",
				},
				...otherTypes.map(

					type =>
						({
							...portfolio.positions[2],
							currentValue:
								type === "OPTION" ? { currency: "RUB", value: "50" } : null,
							figi: `FIGI-${type}-NEXT`,
							type,
						}),
				),
			],
			structure: { currencies: [], unvaluedCategories: [] },
			totalsByCurrency: [{ currency: "RUB", value: "1250" }],
		};

		const original = structuredClone(snapshot);

		const sections = toAccountPagePositionSections(snapshot);

		expect(sections.map(section => section.kind)).toEqual([
			"stocks",
			"bonds",
			"other",
		]);
		expect(sections[2]?.groups.map(group => group.positions[0].figi)).toEqual([
			"FIGI-FUND",
			...otherTypes.map(type => `FIGI-${type}-NEXT`),
		]);
		expect(sections[0]?.groups[0]?.positions[0].shareText).toBe("40 %");
		expect(sections[1]?.groups[0]?.positions[0].shareText).toBe("20 %");
		expect(sections[2]?.groups[1]?.positions[0].shareText).toBe("20 %");
		expect(snapshot).toEqual(original);
	});

	it("prepares grouped position sections with derived display data", () => {
		expect(
			toAccountPagePositionSections(portfolio).map(({ groups, kind }) => ({
				kind,
				positions: groups.flatMap(group => group.positions),
			})),
		).toMatchObject([
			{
				kind: "stocks",
				positions: [
					{
						displayName: "Акция",
						logoSrc: "https://invest-brands.cdn-tinkoff.ru/akciyax160.png",
						returnPercent: null,
						returnPercentText: null,
						returnText: "+10 ₽",
						returnTone: "positive",
						shareText: "66,7 %",
					},
				],

			},
			{
				kind: "bonds",
				positions: [
					{
						displayName: "Облигация",
						logoSrc: null,
						returnPercent: "-11.111111",
						returnPercentText: "-11,11 %",
						returnText: "-5 ₽",
						returnTone: "negative",
						shareText: "33,3 %",
					},
				],
			},
			{
				kind: "other",
				positions: [
					{
						displayName: "Фонд",
						logoSrc: null,
						returnPercent: null,
						returnPercentText: null,
						returnText: null,
						returnTone: undefined,
						shareText: null,
					},
				],
			},
		]);
	});

	it("uses ISIN only when FIGI is absent, never merging by name or ticker", () => {
		expect(

			sections([
				{
					...position,
					figi: null,
				},
				{ ...second, figi: null },
			])[0]?.groups,
		).toHaveLength(1);
		expect(
			sections([position, { ...second, figi: "OTHER-FIGI" }])[0]?.groups,
		).toHaveLength(2);
		expect(

			sections([
				{
					...position,
					figi: null,
					isin: null,
				},
				{
					...second,
					figi: null,
					isin: null,
				},
			])[0]?.groups,
		).toHaveLength(2);
	});

	it("preserves one-account cards and does not merge repeated rows on the same account", () => {
		expect(
			sections([position, { ...second, account: position.account }])[0]?.groups,
		).toHaveLength(2);
		expect(
			sections([
				{ ...position, account: undefined },
				{ ...second, account: undefined },
			])[0]?.groups,
		).toHaveLength(2);
	});

	it("keeps currencies and purchase prices attached to their source positions", () => {
		const source = [
			position,
			{
				...second,
				averagePurchasePrice: { currency: "USD", value: "0.99" },
				currentValue: { currency: "USD", value: "1.01" },
			},
		];

		const before = structuredClone(source);
		const group = sections(source)[0]?.groups[0];
		expect(
			group?.positions.map(item => [
				item.quantity,
				item.currentValue,
				item.averagePurchasePrice,
			]),
		).toEqual(
			source.map(item => [
				item.quantity,
				item.currentValue,
				item.averagePurchasePrice,
			]),
		);
		expect(source).toEqual(before);
	});
});

describe("account position returns", () => {
	it.each([
		{
			absoluteReturn: { currency: "RUB", value: "25" },
			averagePurchasePrice: { currency: "RUB", value: "280" },
			expected: "7.142857",
			name: "gain",
			quantity: "1.25",
			type: "STOCK",
		},
		{
			absoluteReturn: { currency: "RUB", value: "-25" },
			averagePurchasePrice: { currency: "RUB", value: "280" },
			expected: "-7.142857",
			name: "loss",
			quantity: "1.25",
			type: "STOCK",
		},
		{
			absoluteReturn: { currency: "RUB", value: "-5" },
			averagePurchasePrice: { currency: "RUB", value: "45" },
			expected: "-11.111111",
			name: "bond without accrued interest",
			quantity: "1",
			type: "BOND",
		},
	] as const)("calculates $name from the clean purchase cost", (testCase) => {
		const result = sections([makePosition({
			absoluteReturn: testCase.absoluteReturn,
			averagePurchasePrice: testCase.averagePurchasePrice,
			quantity: testCase.quantity,
			type: testCase.type,
		})]);

		expect(result[0]?.groups[0]?.positions[0].returnPercent)
			.toBe(testCase.expected);
	});

	it.each([
		{ name: "zero quantity", overrides: { quantity: "0" } },
		{ name: "negative quantity", overrides: { quantity: "-1" } },
		{ name: "missing average price", overrides: { averagePurchasePrice: null } },
		{
			name: "currency mismatch",
			overrides: { averagePurchasePrice: { currency: "USD", value: "280" } },
		},
		{ name: "zero cost", overrides: { averagePurchasePrice: { currency: "RUB", value: "0" } } },
	])("returns null for $name", ({ overrides }) => {
		const result = sections([makePosition({
			absoluteReturn: { currency: "RUB", value: "25" },
			averagePurchasePrice: { currency: "RUB", value: "280" },
			quantity: "1.25",
			...overrides,
		})]);

		expect(result[0]?.groups[0]?.positions[0].returnPercent).toBeNull();
	});

	it.each([
		{ absoluteReturn: "1", expected: "0.000001" },
		{ absoluteReturn: "-1", expected: "-0.000001" },
	])("rounds an exact half away from zero for $absoluteReturn", (testCase) => {
		const result = sections([makePosition({
			absoluteReturn: { currency: "RUB", value: testCase.absoluteReturn },
			averagePurchasePrice: { currency: "RUB", value: "200000000" },
			quantity: "1",
		})]);

		expect(result[0]?.groups[0]?.positions[0].returnPercent)
			.toBe(testCase.expected);
	});

	it.each([
		{ expected: "+1.01", value: "1.005" },
		{ expected: "-1.01", value: "-1.005" },
	])("formats $value for display with a sign and two decimals", (testCase) => {
		expect(formatPositionReturnPercent(testCase.value)).toBe(testCase.expected);
	});

	it("sums complete unrealized returns by currency", () => {
		const result = toUnrealizedReturns([
			makePosition({ absoluteReturn: { currency: "RUB", value: "0.1" } }),
			makePosition({ absoluteReturn: { currency: "RUB", value: "0.2" } }),
			makePosition({ absoluteReturn: { currency: "USD", value: "-2.5" } }),
		]);

		expect(result).toEqual([
			{ currency: "RUB", value: "0.3" },
			{ currency: "USD", value: "-2.5" },
		]);
	});

	it("omits only currencies with incomplete returns", () => {
		const result = toUnrealizedReturns([
			makePosition({ absoluteReturn: { currency: "RUB", value: "10" } }),
			makePosition({
				absoluteReturn: null,
				currentValue: { currency: "RUB", value: "100" },
			}),
			makePosition({ absoluteReturn: { currency: "USD", value: "2" } }),
		]);

		expect(result).toEqual([{ currency: "USD", value: "2" }]);
	});
});