// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package com.flutter.gradle.tasks

import com.flutter.gradle.Deeplink
import com.flutter.gradle.IntentFilterCheck
import com.flutter.gradle.tasks.DeepLinkJsonFromManifestTaskTest.DeeplinkManifestBuilder.PathOverride
import io.mockk.every
import io.mockk.mockk
import org.gradle.api.file.RegularFileProperty
import org.xml.sax.SAXParseException
import java.io.File
import kotlin.test.Test
import kotlin.test.assertContains
import kotlin.test.assertEquals
import kotlin.test.assertFailsWith
import kotlin.test.assertFalse
import kotlin.test.assertTrue
import kotlin.test.fail

/**
 * Tests for [DeepLinkJsonFromManifestTaskHelper].
 *
 * Parsing tests for corner cases are in
 * `flutter/packages/flutter_tools/test/integration.shard/android_gradle_outputs_app_link_settings_test.dart`.
 * Json tests are in `flutter/packages/flutter_tools/gradle/src/test/kotlin/AppLinkSettingsTest.kt` and
 * `flutter/packages/flutter_tools/gradle/src/test/kotlin/DeeplinkTest.kt`.
 *
 * Tests here are focused on malformed manifest behavior and that there are some tests that cover
 * reading from files. The contents of DeepLinks should not be tested in this file.
 */
class DeepLinkJsonFromManifestTaskTest {
    private val defaultNamespace = "dev.flutter.example"
    private val defaultActivity = ".MainActivity"

    private fun createTempManifestFile(content: String): File {
        val manifestFile = File.createTempFile("AndroidManifestTest", ".xml")
        manifestFile.deleteOnExit()
        manifestFile.writeText(content.trimIndent())
        return manifestFile
    }

    @Test
    fun createAppLinkSettingsFileCreation() {
        val scheme = "http"
        val host = "example.com"
        val pathPrefix = "/profile"
        val manifestContent =
            DeeplinkManifestBuilder()
                .addActivity(defaultActivity)
                .addDeeplinks(defaultActivity, listOf(Deeplink(scheme, host, pathPrefix, IntentFilterCheck(hasActionView = true))))
                .build()
        val manifestFile =
            createTempManifestFile(manifestContent)
        val manifest = mockk<RegularFileProperty>()
        every { manifest.get().asFile } returns manifestFile

        val jsonFile = File.createTempFile("deeplink", ".json")
        jsonFile.deleteOnExit()
        val json = mockk<RegularFileProperty>()
        every { json.get().asFile } returns jsonFile

        DeepLinkJsonFromManifestTaskHelper.createAppLinkSettingsFile(
            defaultNamespace,
            manifest,
            json
        )
        assertEquals(
            DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(defaultNamespace, manifestFile).toJson().toString(),
            jsonFile.readText()
        )
    }

    @Test
    fun noApplicationInManifest() {
        val manifestContent =
            """
            <?xml version="1.0" encoding="utf-8"?>
            <manifest xmlns:android="http://schemas.android.com/apk/res/android"
                package="$defaultNamespace">
            </manifest>
            """.trimIndent()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings = DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(defaultNamespace, manifestFile)

        assertEquals(defaultNamespace, appLinkSettings.applicationId)
        assertFalse(appLinkSettings.deeplinkingFlagEnabled)
        assertTrue(appLinkSettings.deeplinks.isEmpty())
    }

    @Test
    fun applicationNoDeepLinkingElements() {
        val manifestContent = DeeplinkManifestBuilder().build()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings = DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(defaultNamespace, manifestFile)
        assertEquals(defaultNamespace, appLinkSettings.applicationId)
        assertFalse(appLinkSettings.deeplinkingFlagEnabled)
        assertTrue(appLinkSettings.deeplinks.isEmpty())
    }

    @Test
    fun metaDataDeepLinkingEnabledTrue() {
        val manifestContent = DeeplinkManifestBuilder().addActivity("$defaultNamespace.MainActivity").setDeeplinkEnabled(true).build()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings =
            DeepLinkJsonFromManifestTaskHelper
                .createAppLinkSettings(
                    defaultNamespace,
                    manifestFile
                )
        assertEquals(defaultNamespace, appLinkSettings.applicationId)
        assertTrue(appLinkSettings.deeplinkingFlagEnabled)
        assertTrue(appLinkSettings.deeplinks.isEmpty())
    }

    @Test
    fun metaDataDeepLinkingEnabledFalse() {
        val manifestContent = DeeplinkManifestBuilder().addActivity("$defaultNamespace.MainActivity").setDeeplinkEnabled(false).build()
        val manifestFile = createTempManifestFile(manifestContent)

        val appLinkSettings = DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(defaultNamespace, manifestFile)
        assertEquals(defaultNamespace, appLinkSettings.applicationId)
        assertFalse(appLinkSettings.deeplinkingFlagEnabled)
        assertTrue(appLinkSettings.deeplinks.isEmpty())
    }

    @Test
    fun metaDataDeepLinkingEnabledInvalidValue() {
        val manifestContent =
            """
            <?xml version="1.0" encoding="utf-8"?>
            <manifest xmlns:android="http://schemas.android.com/apk/res/android"
                package="$defaultNamespace">
                <application android:label="Test App">
                    <meta-data android:name="flutter_deeplinking_enabled" android:value="not_a_boolean" />
                </application>
            </manifest>
            """.trimIndent()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings = DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(defaultNamespace, manifestFile)

        assertEquals(defaultNamespace, appLinkSettings.applicationId)
        assertFalse(appLinkSettings.deeplinkingFlagEnabled, "Should default to false for invalid meta-data value")
        assertTrue(appLinkSettings.deeplinks.isEmpty())
    }

    @Test
    fun metaDataDeepLinkingNoValue() {
        val manifestContent =
            """
            <?xml version="1.0" encoding="utf-8"?>
            <manifest xmlns:android="http://schemas.android.com/apk/res/android"
                package="$defaultNamespace">
                <application android:label="Test App">
                    <meta-data android:name="flutter_deeplinking_enabled" />
                </application>
            </manifest>
            """.trimIndent()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings = DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(defaultNamespace, manifestFile)

        assertEquals(defaultNamespace, appLinkSettings.applicationId)
        assertFalse(appLinkSettings.deeplinkingFlagEnabled, "Should default to false if meta-data value is missing")
        assertTrue(appLinkSettings.deeplinks.isEmpty())
    }

    @Test
    fun basicDeepLink() {
        val scheme = "http"
        val host = "example.com"
        val pathPrefix = "/profile"
        val expectedDeeplink = Deeplink(scheme, host, pathPrefix, IntentFilterCheck(hasActionView = true))
        val manifestContent =
            DeeplinkManifestBuilder()
                .addActivity(
                    defaultActivity
                ).addDeeplinks(defaultActivity, listOf(expectedDeeplink))
                .build()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings =
            DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(
                defaultNamespace,
                manifestFile
            )

        assertEquals(defaultNamespace, appLinkSettings.applicationId)
        assertTrue(appLinkSettings.deeplinkingFlagEnabled)
        assertEquals(1, appLinkSettings.deeplinks.size)
        assertContains(
            appLinkSettings.deeplinks,
            expectedDeeplink,
            "Did not find $expectedDeeplink in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
        )
    }

    @Test
    fun deepLinkWithAutoVerify() {
        val scheme = "https"
        val host = "secure.example.com"
        val expectedDeeplink =
            Deeplink(scheme, host, "", IntentFilterCheck(hasAutoVerify = true, hasDefaultCategory = true, hasBrowsableCategory = true))
        val manifestContent =
            DeeplinkManifestBuilder()
                .addActivity(
                    defaultActivity
                ).addDeeplinks(defaultActivity, listOf(expectedDeeplink))
                .build()
        val manifestFile = createTempManifestFile(manifestContent)
        try {
            val appLinkSettings =
                DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(
                    defaultNamespace,
                    manifestFile
                )
            assertEquals(1, appLinkSettings.deeplinks.size)
            assertContains(
                appLinkSettings.deeplinks,
                expectedDeeplink,
                "Did not find $expectedDeeplink in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
            )
        } catch (e: SAXParseException) {
            fail("Failed to parse Manifest:\n$manifestContent", e)
        }
    }

    @Test
    fun multipleIntentFilters() {
        val expectedLink1 =
            Deeplink(
                "custom",
                "filter.one",
                ".*",
                IntentFilterCheck(hasAutoVerify = false, hasActionView = true, hasDefaultCategory = true, hasBrowsableCategory = true)
            )
        val expectedLink2 =
            Deeplink(
                "https",
                "filter.two",
                "/product.*",
                IntentFilterCheck(hasAutoVerify = true, hasActionView = true, hasDefaultCategory = true, hasBrowsableCategory = true)
            )
        val manifestContent =
            DeeplinkManifestBuilder()
                .addActivity(
                    defaultActivity
                ).addDeeplinks(defaultActivity, listOf(expectedLink1, expectedLink2))
                .build()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings =
            DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(
                defaultNamespace,
                manifestFile
            )
        assertEquals(2, appLinkSettings.deeplinks.size)
        assertContains(
            appLinkSettings.deeplinks,
            expectedLink1,
            "Did not find $expectedLink1 in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
        )
        assertContains(
            appLinkSettings.deeplinks,
            expectedLink2,
            "Did not find $expectedLink2 in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
        )
    }

    @Test
    fun multipleActivitiesWithDeepLinks() {
        val otherActivity = ".OtherActivity"
        val expectedDeeplink1 =
            Deeplink(
                "app",
                "main.activity",
                null,
                IntentFilterCheck(hasActionView = true, hasDefaultCategory = true, hasBrowsableCategory = true)
            )
        val expectedDeeplink2 =
            Deeplink(
                "http",
                "other.activity",
                ".*user.*",
                IntentFilterCheck(hasAutoVerify = true, hasActionView = true, hasBrowsableCategory = true)
            )
        val manifestContent =
            DeeplinkManifestBuilder()
                .addActivity(defaultActivity)
                .addActivity(otherActivity)
                .addDeeplinks(defaultActivity, listOf(expectedDeeplink1))
                .addDeeplinks(otherActivity, listOf(expectedDeeplink2))
                .build()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings =
            DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(
                defaultNamespace,
                manifestFile
            )
        assertEquals(2, appLinkSettings.deeplinks.size)
        assertContains(
            appLinkSettings.deeplinks,
            // Path when not set is assumed to be ".*"
            Deeplink(expectedDeeplink1.scheme, expectedDeeplink1.host, ".*", expectedDeeplink1.intentFilterCheck),
            "Did not find $expectedDeeplink1 in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
        )
        assertContains(
            appLinkSettings.deeplinks,
            expectedDeeplink2,
            "Did not find $expectedDeeplink2 in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
        )
    }

    @Test
    fun intentFilterMissingHostInData() {
        val expectedDeeplink =
            Deeplink(
                "http",
                host = null,
                path = null,
                IntentFilterCheck(hasActionView = true, hasBrowsableCategory = true, hasDefaultCategory = true)
            )
        val manifestContent =
            DeeplinkManifestBuilder()
                .addActivity(
                    defaultActivity
                ).addDeeplinks(defaultActivity, listOf(expectedDeeplink))
                .build()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings = DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(defaultNamespace, manifestFile)
        assertTrue(appLinkSettings.deeplinks.isEmpty(), "Intent filter with data missing host should be ignored")
    }

    @Test
    fun malformedManifestXML() {
        val manifestFile = createTempManifestFile("<manifest><application></application><manifest>") // Malformed XML
        assertFailsWith<SAXParseException> {
            DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(defaultNamespace, manifestFile)
        }
    }

    @Test
    fun multiplePathTypes() {
        val expectedLink1 =
            Deeplink(
                "custom",
                "filter.one",
                "/product.*",
                IntentFilterCheck(hasAutoVerify = true, hasActionView = true, hasDefaultCategory = true, hasBrowsableCategory = true)
            )
        val expectedLink2 =
            Deeplink(
                "https",
                "filter.two",
                "/product2.*",
                IntentFilterCheck(hasAutoVerify = true, hasActionView = true, hasDefaultCategory = true)
            )
        val expectedLink3 =
            Deeplink(
                "https",
                "filter.three",
                "prefix",
                IntentFilterCheck(hasAutoVerify = true, hasActionView = true)
            )
        val expectedLink4 =
            Deeplink(
                "https",
                "filter.four",
                "suffix",
                IntentFilterCheck(hasAutoVerify = true)
            )
        // pathOverride requires all links to have a different host
        val pathOverride =
            PathOverride { deeplink ->
                if (expectedLink1.host == deeplink.host) {
                    return@PathOverride """android:pathAdvancedPattern="${deeplink.path}""""
                }
                if (expectedLink2.host == deeplink.host) {
                    return@PathOverride """android:pathPattern="${deeplink.path}""""
                }
                if (expectedLink3.host == deeplink.host) {
                    return@PathOverride """android:pathPrefix="${deeplink.path}""""
                }
                if (expectedLink4.host == deeplink.host) {
                    return@PathOverride """android:pathSuffix="${deeplink.path}""""
                }
                // Same as default.
                return@PathOverride """android:path="${deeplink.path}""""
            }
        val manifestContent =
            DeeplinkManifestBuilder()
                .addActivity(defaultActivity)
                .addDeeplinks(defaultActivity, listOf(expectedLink1, expectedLink2, expectedLink3, expectedLink4))
                .setDeeplinkPathOverride(pathOverride)
                .build()
        val manifestFile = createTempManifestFile(manifestContent)
        val appLinkSettings =
            DeepLinkJsonFromManifestTaskHelper.createAppLinkSettings(
                defaultNamespace,
                manifestFile
            )
        assertEquals(4, appLinkSettings.deeplinks.size)
        assertContains(
            appLinkSettings.deeplinks,
            expectedLink1,
            "Did not find $expectedLink1 in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
        )
        assertContains(
            appLinkSettings.deeplinks,
            expectedLink2,
            "Did not find $expectedLink2 in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
        )
        val prefix = Deeplink(expectedLink3.scheme, expectedLink3.host, "${expectedLink3.path}.*", expectedLink1.intentFilterCheck)
        assertContains(
            appLinkSettings.deeplinks,
            prefix,
            "Did not find $prefix in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
        )
        val suffix = Deeplink(expectedLink4.scheme, expectedLink4.host, ".*${expectedLink4.path}", expectedLink4.intentFilterCheck)
        assertContains(
            appLinkSettings.deeplinks,
            suffix,
            "Did not find $suffix in ${appLinkSettings.deeplinks.joinToString { it.toJson().toString() }}"
        )
    }

    /**
     * Helper class for creating valid android manifest file that contains deep links.
     */
    class DeeplinkManifestBuilder {
        private var namespace: String = "dev.flutter.example"

        private var deeplinkEnabled = true
        private val activitySet: MutableSet<String> = mutableSetOf()
        private val deeplinkMap: MutableMap<String, List<Deeplink>> = mutableMapOf()

        fun interface PathOverride {
            /**
             * Allow's for per deeplink override of manifest entry value.
             */
            fun generatePath(deeplink: Deeplink): String
        }

        // By default use android:path with the passed in deeplink.path contents.
        private var pathOverride =
            PathOverride { deeplink ->
                deeplink.path?.let { path -> """android:path="$path"""" } ?: ""
            }

        fun setNamespace(namespace: String): DeeplinkManifestBuilder {
            this.namespace = namespace
            return this
        }

        fun addActivity(activity: String): DeeplinkManifestBuilder {
            activitySet.add(activity)
            return this
        }

        fun addDeeplinks(
            activity: String,
            deeplinks: List<Deeplink>
        ): DeeplinkManifestBuilder {
            deeplinkMap[activity] = deeplinks
            return this
        }

        fun setDeeplinkEnabled(enabled: Boolean): DeeplinkManifestBuilder {
            deeplinkEnabled = enabled
            return this
        }

        fun setDeeplinkPathOverride(override: PathOverride): DeeplinkManifestBuilder {
            pathOverride = override
            return this
        }

        fun build(): String {
            var activitySection = ""
            // Warning: Xml parsing can be sensitive to whitespace changes.
            if (activitySet.isNotEmpty()) {
                for (activity in activitySet) {
                    activitySection += "\t<activity android:name=\"$activity\" android:exported=\"true\">\n"
                    if (deeplinkEnabled) {
                        activitySection +=
                            "\t\t" + """<meta-data android:name="flutter_deeplinking_enabled" android:value="true" />""" + "\n"
                    }
                    if (deeplinkMap[activity] == null) {
                        // Close activity and do not continue to deep link parsing.
                        activitySection += "\t</activity>"
                        continue
                    }
                    for (deeplink in deeplinkMap[activity]!!) {
                        if (deeplink.intentFilterCheck.hasAutoVerify) {
                            activitySection += ("\t\t" + """<intent-filter android:autoVerify="true">""" + "\n")
                        } else {
                            activitySection += ("\t\t" + """<intent-filter>""" + "\n")
                        }
                        if (deeplink.intentFilterCheck.hasActionView) {
                            activitySection += "\t\t\t" + """<action android:name="android.intent.action.VIEW" />""" + "\n"
                        }
                        if (deeplink.intentFilterCheck.hasDefaultCategory) {
                            activitySection += "\t\t\t" + """<category android:name="android.intent.category.DEFAULT" />""" + "\n"
                        }
                        if (deeplink.intentFilterCheck.hasBrowsableCategory) {
                            activitySection += "\t\t\t" + """<category android:name="android.intent.category.BROWSABLE" />""" + "\n"
                        }
                        val scheme =
                            deeplink.scheme?.let { scheme -> """android:scheme="$scheme"""" } ?: ""
                        val host = deeplink.host?.let { host -> """android:host="$host"""" } ?: ""
                        val path = pathOverride.generatePath(deeplink)
                        activitySection += "\t\t\t<data $scheme $host $path/>\n"
                        activitySection += "\t\t" + """</intent-filter>""" + "\n"
                    }
                    activitySection += "\t</activity>\n"
                }
            }

            val manifestContent = """<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="$namespace">
    <application android:label="Test App">
    $activitySection
    </application>
</manifest>
"""
            try {
                // Debugging malformed xml data from a SAXParseException log only
                // is difficult. Print the manifest content to aid in debugging.
                groovy.xml
                    .XmlParser(false, false)
                    .parseText(manifestContent)
            } catch (e: SAXParseException) {
                fail("Failed to parse Manifest:\n$manifestContent", e)
            }
            return manifestContent
        }
    }
}