/*
 * Copyright (C) 2021 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.net.module.util

import android.util.Log
import com.android.testutils.TryTestConfig
import com.android.testutils.tryTest
import java.util.function.Consumer
import kotlin.test.assertEquals
import kotlin.test.assertFailsWith
import kotlin.test.assertNull
import kotlin.test.assertTrue
import kotlin.test.fail
import org.junit.After
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4

private val TAG = CleanupTest::class.simpleName

@RunWith(JUnit4::class)
class CleanupTest {
    class TestException1 : Exception()
    class TestException2 : Exception()
    class TestException3 : Exception()

    private var originalDiagnosticsCollector: Consumer<Throwable>? = null

    @Before
    fun setUp() {
        originalDiagnosticsCollector = TryTestConfig.swapDiagnosticsCollector(null)
    }

    @After
    fun tearDown() {
        TryTestConfig.swapDiagnosticsCollector(originalDiagnosticsCollector)
    }

    @Test
    fun testNotThrow() {
        var x = 1
        val result = tryTest {
            x = 2
            Log.e(TAG, "Do nothing")
            6
        } cleanup {
            assertTrue(x == 2)
            x = 3
            Log.e(TAG, "Do nothing")
        }
        assertTrue(x == 3)
        assertTrue(result == 6)
    }

    @Test
    fun testThrowTry() {
        var x = 1
        val thrown = assertFailsWith<TestException1> {
            tryTest {
                x = 2
                throw TestException1()
                x = 4
            } cleanup {
                assertTrue(x == 2)
                x = 3
                Log.e(TAG, "Do nothing")
            }
        }
        assertTrue(thrown.suppressedExceptions.isEmpty())
        assertTrue(x == 3)
    }

    @Test
    fun testThrowCleanup() {
        var x = 1
        val thrown = assertFailsWith<TestException2> {
            tryTest {
                x = 2
                Log.e(TAG, "Do nothing")
            } cleanup {
                assertTrue(x == 2)
                x = 3
                throw TestException2()
                x = 4
            }
        }
        assertTrue(thrown.suppressedExceptions.isEmpty())
        assertTrue(x == 3)
    }

    @Test
    fun testThrowBoth() {
        var x = 1
        val thrown = assertFailsWith<TestException1> {
            tryTest {
                x = 2
                throw TestException1()
                x = 3
            } cleanup {
                assertTrue(x == 2)
                x = 4
                throw TestException2()
                x = 5
            }
        }
        assertTrue(thrown.suppressedExceptions[0] is TestException2)
        assertTrue(x == 4)
    }

    @Test
    fun testReturn() {
        val resultIfSuccess = 11
        val resultIfException = 12
        fun doTestReturn(crash: Boolean) = tryTest {
            if (crash) throw RuntimeException() else resultIfSuccess
        }.catch<RuntimeException> {
            resultIfException
        } cleanup {}

        assertTrue(6 == tryTest { 6 } cleanup { Log.e(TAG, "tested") })
        assertEquals(resultIfSuccess, doTestReturn(crash = false))
        assertEquals(resultIfException, doTestReturn(crash = true))
    }

    @Test
    fun testCatch() {
        var x = 1
        tryTest {
            x = 2
            throw TestException1()
            x = 3
        }.catch<TestException1> {
            x = 4
        }.catch<TestException2> {
            x = 5
        } cleanup {
            assertTrue(x == 4)
            x = 6
        }
        assertTrue(x == 6)
    }

    @Test
    fun testNotCatch() {
        var x = 1
        assertFailsWith<TestException1> {
            tryTest {
                x = 2
                throw TestException1()
            }.catch<TestException2> {
                fail("Caught TestException2 instead of TestException1")
            } cleanup {
                assertTrue(x == 2)
                x = 3
            }
        }
        assertTrue(x == 3)
    }

    @Test
    fun testThrowInCatch() {
        var x = 1
        val thrown = assertFailsWith<TestException2> {
            tryTest {
                x = 2
                throw TestException1()
            }.catch<TestException1> {
                x = 3
                throw TestException2()
            } cleanup {
                assertTrue(x == 3)
                x = 4
            }
        }
        assertTrue(x == 4)
        assertTrue(thrown.suppressedExceptions.isEmpty())
    }

    @Test
    fun testAssertionErrorInCatch() {
        var x = 1
        val thrown = assertFailsWith<AssertionError> {
            tryTest {
                x = 2
                throw TestException1()
            }.catch<TestException1> {
                x = 3
                fail("Test failure in catch")
            } cleanup {
                assertTrue(x == 3)
                x = 4
            }
        }
        assertTrue(x == 4)
        assertTrue(thrown.suppressedExceptions.isEmpty())
    }

    @Test
    fun testMultipleCleanups() {
        var x = 1
        val thrown = assertFailsWith<TestException1> {
            tryTest {
                x = 2
                throw TestException1()
            } cleanupStep {
                assertTrue(x == 2)
                x = 3
                throw TestException2()
                x = 4
            } cleanupStep {
                assertTrue(x == 3)
                x = 5
                throw TestException3()
                x = 6
            } cleanup {
                assertTrue(x == 5)
                x = 7
            }
        }
        assertEquals(2, thrown.suppressedExceptions.size)
        assertTrue(thrown.suppressedExceptions[0] is TestException2)
        assertTrue(thrown.suppressedExceptions[1] is TestException3)
        assert(x == 7)
    }

    @Test
    fun testNoErrorReportingWhenCaught() {
        var error: Throwable? = null
        TryTestConfig.swapDiagnosticsCollector {
            error = it
        }
        var x = 1
        tryTest {
            x = 2
            throw TestException1()
            x = 3
        }.catch<TestException1> {
            x = 4
        } cleanup {
            x = 5
        }

        assertEquals(5, x)
        assertNull(error)
    }

    @Test
    fun testErrorReportingInTry() {
        var error: Throwable? = null
        TryTestConfig.swapDiagnosticsCollector {
            assertNull(error)
            error = it
        }
        var x = 1
        assertFailsWith<TestException1> {
            tryTest {
                x = 2
                throw TestException1()
                x = 3
            } cleanupStep {
                throw TestException2()
                x = 4
            } cleanup {
                x = 5
            }
        }

        assertEquals(5, x)
        assertTrue(error is TestException1)
    }

    @Test
    fun testErrorReportingInCatch() {
        var error: Throwable? = null
        TryTestConfig.swapDiagnosticsCollector {
            assertNull(error)
            error = it
        }
        var x = 1
        assertFailsWith<TestException2> {
            tryTest {
                throw TestException1()
                x = 2
            }.catch<TestException1> {
                throw TestException2()
                x = 3
            } cleanup {
                x = 4
            }
        }

        assertEquals(4, x)
        assertTrue(error is TestException2)
    }
}