compose-jb/components/resources/library/src/desktopTest/kotlin/org/jetbrains/compose/resources/ComposeResourceTest.desktop.kt

package org.jetbrains.compose.resources

import androidx.compose.foundation.Image
import androidx.compose.material3.Text
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.ui.test.ExperimentalTestApi
import androidx.compose.ui.test.runComposeUiTest
import kotlinx.coroutines.flow.MutableStateFlow
import org.junit.Assert.assertEquals
import org.junit.Before
import org.junit.Test
import kotlin.test.assertEquals

@OptIn(ExperimentalResourceApi::class, ExperimentalTestApi::class)
class ComposeResourceTest {

    @Before
    fun dropCaches() {
        dropStringsCache()
        dropImageCache()
    }

    @Test
    fun testCountRecompositions() = runComposeUiTest {
        runBlockingTest {
            val imagePathFlow = MutableStateFlow(ImageResource("1.png"))
            val recompositionsCounter = RecompositionsCounter()
            setContent {
                val res by imagePathFlow.collectAsState()
                val imgRes = imageResource(res)
                recompositionsCounter.content {
                    Image(bitmap = imgRes, contentDescription = null)
                }
            }
            awaitIdle()
            imagePathFlow.emit(ImageResource("2.png"))
            awaitIdle()
            assertEquals(2, recompositionsCounter.count)
        }
    }

    @Test
    fun testImageResourceCache() = runComposeUiTest {
        runBlockingTest {
            val testResourceReader = TestResourceReader()
            val imagePathFlow = MutableStateFlow(ImageResource("1.png"))
            setContent {
                CompositionLocalProvider(LocalResourceReader provides testResourceReader) {
                    val res by imagePathFlow.collectAsState()
                    Image(painterResource(res), null)
                }
            }
            awaitIdle()
            imagePathFlow.emit(ImageResource("2.png"))
            awaitIdle()
            imagePathFlow.emit(ImageResource("1.png"))
            awaitIdle()

            assertEquals(
                expected = listOf("1.png", "2.png"), //no second read of 1.png
                actual = testResourceReader.readPaths
            )
        }
    }

    @Test
    fun testStringResourceCache() = runComposeUiTest {
        runBlockingTest {
            val testResourceReader = TestResourceReader()
            val stringIdFlow = MutableStateFlow(TestStringResource("app_name"))
            setContent {
                CompositionLocalProvider(LocalResourceReader provides testResourceReader) {
                    val res by stringIdFlow.collectAsState()
                    Text(getString(res))
                    Text(getStringArray(TestStringResource("str_arr")).joinToString())
                }
            }
            awaitIdle()
            stringIdFlow.emit(TestStringResource("hello"))
            awaitIdle()
            stringIdFlow.emit(TestStringResource("app_name"))
            awaitIdle()

            assertEquals(
                expected = listOf("strings.xml"), //just one string.xml read
                actual = testResourceReader.readPaths
            )
        }
    }

    @Test
    fun testReadStringResource() = runComposeUiTest {
        runBlockingTest {
            setContent {
                assertEquals("Compose Resources App", getString(TestStringResource("app_name")))
                assertEquals(
                    "Hello, test-name! You have 42 new messages.",
                    getString(TestStringResource("str_template"), "test-name", 42)
                )
                assertEquals(listOf("item 1", "item 2", "item 3"), getStringArray(TestStringResource("str_arr")))
            }
            awaitIdle()
        }
    }
}