import { ApiVersion, type Organization } from "@autumn/shared";
import { AppEnv, Autumn } from "autumn-js";
import { expect } from "chai";
import chalk from "chalk";
import type { Stripe } from "stripe";
import { setupBefore } from "tests/before.js";
import type { DrizzleCli } from "@/db/initDrizzle.js";
import { AutumnInt } from "@/external/autumn/autumnCli.js";
import { constructProduct } from "@/utils/scriptUtils/createTestProducts.js";
import { constructArrearItem } from "@/utils/scriptUtils/constructItem.js";
import { addPrefixToProducts } from "tests/attach/utils.js";
import { createProducts } from "tests/utils/productUtils.js";
import { initCustomerV2 } from "@/utils/scriptUtils/initCustomer.js";
import { TestFeature } from "tests/setup/v2Features.js";
import { EventService } from "@/internal/api/events/EventService.js";

const testCase = "sync4";
const customerId = `${testCase}_cus1`;

const messageItem = constructArrearItem({
	featureId: TestFeature.Messages,
	includedUsage: 5,
	price: 0.1,
	billingUnits: 1,
	usageLimit: 10,
});

const pro = constructProduct({
    id: "pro",
    items: [messageItem],
    type: "pro",
})

describe(`${chalk.yellowBright(`sync/${testCase}: Testing usage_limits with PayPerUse feature and concurrent requests`)}`, () => {
	let db: DrizzleCli;
	let org: Organization;
	let env: AppEnv;
	let stripeCli: Stripe;
	let autumnInt: AutumnInt = new AutumnInt({ version: ApiVersion.V1_2 });
    let autumnJs: Autumn;

	before(async function () {
		await setupBefore(this);
		db = this.db;
		org = this.org;
		env = this.env;
		stripeCli = this.stripeCli;
        autumnJs = this.autumnJs;
		try {
			await (autumnInt as AutumnInt).customers.delete(customerId);
			await EventService.del
		} catch (_) {}

        await addPrefixToProducts({
            products: [pro],
            prefix: testCase,
        })

        await createProducts({
            autumn: autumnInt,
            products: [pro],
            customerId,
            db,
            orgId: org.id,
            env,
        }).catch(_ => {})
	});

	it("should create a customer and issue balances", async () => {
        const { customer } = await initCustomerV2({
            autumn: autumnInt,
            customerId,
            org,
            env,
            db,
            attachPm: "success",
        })
		expect(customer).to.exist;
		expect(customer.id).to.equal(customerId);
		expect(customer.name).to.equal(customerId);
		expect(customer.email).to.equal(`${customerId}@example.com`);

        await autumnJs.attach({
            customer_id: customerId,
            product_id: pro.id,
        })
	});

	it("should enforce usage_limit with concurrent requests", async () => {
		const customer = await autumnInt.customers.get(customerId);
		const balance = customer.features[TestFeature.Messages].balance;
		const usageLimit = customer.features[TestFeature.Messages].usage_limit;

		expect(balance).to.equal(5, `Balance should be 5, got ${balance}`);
		expect(usageLimit).to.equal(10, `Usage limit should be 10, got ${usageLimit}`);

		console.log("🚀 Starting 5 concurrent track calls (3 units each) at exact same time...");
		console.log(`   Initial state: balance=${balance}, usage_limit=${usageLimit} (max total usage in billing cycle)`);

		// Try to use 3 units concurrently - with usage_limit of 10, only 3 requests can succeed (3x3=9 <= 10)
		const promises = [
			autumnInt.track({
				customer_id: customerId,
				feature_id: TestFeature.Messages,
				value: 3,
			}),
			autumnInt.track({
				customer_id: customerId,
				feature_id: TestFeature.Messages,
				value: 3,
			}),
			autumnInt.track({
				customer_id: customerId,
				feature_id: TestFeature.Messages,
				value: 3,
			}),
			autumnInt.track({
				customer_id: customerId,
				feature_id: TestFeature.Messages,
				value: 3,
			}),
			autumnInt.track({
				customer_id: customerId,
				feature_id: TestFeature.Messages,
				value: 3,
			}),
		];

		let results = await Promise.allSettled(promises);

		console.log("📊 Results breakdown:");
		results.forEach((result, index) => {
			if (result.status === "rejected") {
				console.log(`  [${index}] ❌ REJECTED:`, result.reason?.message || result.reason);
			} else {
				console.log(`  [${index}] ✅ FULFILLED:`, JSON.stringify(result.value));
			}
		});

		const successCount = results.filter(r => r.status === "fulfilled").length;
		const rejectedCount = results.filter(r => r.status === "rejected").length;
		console.log(`\n📈 Summary: ${successCount} succeeded, ${rejectedCount} rejected (expected: 3 succeeded, 2 rejected)`);
		console.log(`   Reason: usage_limit=10 means max 10 total units in billing cycle. 3 requests × 3 = 9 ≤ 10, but 4th would be 12 > 10\n`);

		const { data: balances, error } = await autumnJs.customers.get(
			customerId,
		);

		console.log(`📦 Final state after all requests:`);
		console.log(`- Balance: ${balances?.features[TestFeature.Messages]?.balance}`);
		console.log(`- Usage limit: ${balances?.features[TestFeature.Messages]?.usage_limit}`);
		console.log(`- Full feature data:`, JSON.stringify(balances?.features[TestFeature.Messages], null, 4));
		// With usage_limit of 10, only 3 requests of value 3 can succeed (9 total)
		// The 4th request would bring total to 12, exceeding the usage_limit
		// expect(successCount).to.equal(3, `Expected exactly 3 successes (3x3=9 <= usage_limit of 10), got ${successCount} | Results: ${results.map(r => r.status).join(", ")}`);
		// expect(rejectedCount).to.equal(2, `Expected exactly 2 rejections, got ${rejectedCount} | Results: ${results.map(r => r.status).join(", ")}`);

		// expect(error).to.be.null;

		// Balance consumed from included: min(9, 5) = 5, so balance = 0
		// The remaining 4 units (9 - 5) are overages charged via PayPerUse
		// expect(balances?.features[TestFeature.Messages]?.balance).to.equal(
		// 	0,
		// 	`Balance should be 0 (all 5 included used), got ${balances?.features[TestFeature.Messages]?.balance}`,
		// );
		// expect(balances?.features[TestFeature.Messages]?.usage_limit).to.equal(
		// 	10,
		// 	`Usage limit should remain 10, got ${balances?.features[TestFeature.Messages]?.usage_limit}`,
		// );
	});
});