package com.craigvg.lichun_android.managers

import org.junit.Assert.assertEquals
import org.junit.Assert.assertFalse
import org.junit.Assert.assertNull
import org.junit.Assert.assertTrue
import org.junit.Test

/**
 * Tests for BillingManager state and data classes.
 * Full purchase flow tests require an Android context and BillingClient mocking,
 * so here we test the data types and state semantics.
 */
class BillingManagerTest {

    @Test
    fun `ProductIds constants are correct`() {
        assertEquals("diamond1", ProductIds.DIAMOND_PACK_SMALL)
        assertEquals("diamond2", ProductIds.DIAMOND_PACK_LARGE)
    }

    @Test
    fun `PurchasableProduct holds correct values`() {
        val product = PurchasableProduct(
            productId = "diamond1",
            title = "Small Pack",
            description = "100 Diamonds",
            price = "$0.99",
            diamondReward = 100
        )
        assertEquals("diamond1", product.productId)
        assertEquals("Small Pack", product.title)
        assertEquals(100, product.diamondReward)
        assertEquals("$0.99", product.price)
    }

    @Test
    fun `PurchaseResult Success is singleton`() {
        val result: PurchaseResult = PurchaseResult.Success
        assertTrue(result is PurchaseResult.Success)
    }

    @Test
    fun `PurchaseResult Error holds message`() {
        val result = PurchaseResult.Error("Something went wrong")
        assertEquals("Something went wrong", result.message)
    }

    @Test
    fun `PurchaseResult Cancelled is singleton`() {
        val result: PurchaseResult = PurchaseResult.Cancelled
        assertTrue(result is PurchaseResult.Cancelled)
    }

    @Test
    fun `PurchaseResult Pending is singleton`() {
        val result: PurchaseResult = PurchaseResult.Pending
        assertTrue(result is PurchaseResult.Pending)
    }

    @Test
    fun `PurchaseResult types are distinct`() {
        val results = listOf(
            PurchaseResult.Success,
            PurchaseResult.Pending,
            PurchaseResult.Cancelled,
            PurchaseResult.Error("test")
        )
        assertEquals(4, results.distinct().size)
    }
}