/*
 * Copyright 2023 Tusky Contributors
 *
 * This file is a part of Tusky.
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with Tusky; if not,
 * see <http://www.gnu.org/licenses>.
 */

package com.keylesspalace.tusky

import androidx.test.ext.junit.runners.AndroidJUnit4
import com.keylesspalace.tusky.entity.Attachment
import com.keylesspalace.tusky.entity.Filter
import com.keylesspalace.tusky.entity.Poll
import com.keylesspalace.tusky.entity.PollOption
import com.keylesspalace.tusky.entity.Status
import com.keylesspalace.tusky.network.FilterModel
import com.keylesspalace.tusky.view.getSecondsForDurationIndex
import org.junit.Assert.assertFalse
import org.junit.Assert.assertTrue
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.kotlin.mock
import org.robolectric.annotation.Config
import java.time.Instant
import java.util.Date

@Config(sdk = [28])
@RunWith(AndroidJUnit4::class)
class FilterTest {

    private lateinit var filterModel: FilterModel

    @Before
    fun setup() {
        filterModel = FilterModel()
        val filters = listOf(
            Filter(
                id = "123",
                phrase = "badWord",
                context = listOf(Filter.HOME),
                expiresAt = null,
                irreversible = false,
                wholeWord = false
            ),
            Filter(
                id = "123",
                phrase = "badWholeWord",
                context = listOf(Filter.HOME, Filter.PUBLIC),
                expiresAt = null,
                irreversible = false,
                wholeWord = true
            ),
            Filter(
                id = "123",
                phrase = "@twitter.com",
                context = listOf(Filter.HOME),
                expiresAt = null,
                irreversible = false,
                wholeWord = true
            ),
            Filter(
                id = "123",
                phrase = "#hashtag",
                context = listOf(Filter.HOME),
                expiresAt = null,
                irreversible = false,
                wholeWord = true
            ),
            Filter(
                id = "123",
                phrase = "expired",
                context = listOf(Filter.HOME),
                expiresAt = Date.from(Instant.now().minusSeconds(10)),
                irreversible = false,
                wholeWord = true
            ),
            Filter(
                id = "123",
                phrase = "unexpired",
                context = listOf(Filter.HOME),
                expiresAt = Date.from(Instant.now().plusSeconds(3600)),
                irreversible = false,
                wholeWord = true
            ),
            Filter(
                id = "123",
                phrase = "href",
                context = listOf(Filter.HOME),
                expiresAt = null,
                irreversible = false,
                wholeWord = false
            ),
        )

        filterModel.initWithFilters(filters)
    }

    @Test
    fun shouldNotFilter() {
        assertFalse(
            filterModel.shouldFilterStatus(
                mockStatus(content = "should not be filtered")
            )
        )
    }

    @Test
    fun shouldFilter_whenContentMatchesBadWord() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(content = "one two badWord three")
            )
        )
    }

    @Test
    fun shouldFilter_whenContentMatchesBadWordPart() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(content = "one two badWordPart three")
            )
        )
    }

    @Test
    fun shouldFilter_whenContentMatchesBadWholeWord() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(content = "one two badWholeWord three")
            )
        )
    }

    @Test
    fun shouldNotFilter_whenContentDoesNotMatchWholeWord() {
        assertFalse(
            filterModel.shouldFilterStatus(
                mockStatus(content = "one two badWholeWordTest three")
            )
        )
    }

    @Test
    fun shouldFilter_whenSpoilerTextDoesMatch() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(
                    content = "should not be filtered",
                    spoilerText = "badWord should be filtered"
                )
            )
        )
    }

    @Test
    fun shouldFilter_whenPollTextDoesMatch() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(
                    content = "should not be filtered",
                    spoilerText = "should not be filtered",
                    pollOptions = listOf("should not be filtered", "badWord")
                )
            )
        )
    }

    @Test
    fun shouldFilter_whenMediaDescriptionDoesMatch() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(
                    content = "should not be filtered",
                    spoilerText = "should not be filtered",
                    attachmentsDescriptions = listOf("should not be filtered", "badWord"),
                )
            )
        )
    }

    @Test
    fun shouldFilterPartialWord_whenWholeWordFilterContainsNonAlphanumericCharacters() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(content = "one two someone@twitter.com three")
            )
        )
    }

    @Test
    fun shouldFilterHashtags() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(content = "#hashtag one two three")
            )
        )
    }

    @Test
    fun shouldFilterHashtags_whenContentIsMarkedUp() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(content = "<p><a href=\"https://foo.bar/tags/hashtag\" class=\"mention hashtag\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">#<span>hashtag</span></a>one two three</p>")
            )
        )
    }

    @Test
    fun shouldNotFilterHtmlAttributes() {
        assertFalse(
            filterModel.shouldFilterStatus(
                mockStatus(content = "<p><a href=\"https://foo.bar/\">https://foo.bar/</a> one two three</p>")
            )
        )
    }

    @Test
    fun shouldNotFilter_whenFilterIsExpired() {
        assertFalse(
            filterModel.shouldFilterStatus(
                mockStatus(content = "content matching expired filter should not be filtered")
            )
        )
    }

    @Test
    fun shouldFilter_whenFilterIsUnexpired() {
        assertTrue(
            filterModel.shouldFilterStatus(
                mockStatus(content = "content matching unexpired filter should be filtered")
            )
        )
    }

    @Test
    fun unchangedExpiration_shouldBeNegative_whenFilterIsExpired() {
        val expiredBySeconds = 3600
        val expiredDate = Date.from(Instant.now().minusSeconds(expiredBySeconds.toLong()))
        val updatedDuration = getSecondsForDurationIndex(-1, null, expiredDate)
        assert(updatedDuration != null && updatedDuration <= -expiredBySeconds)
    }

    @Test
    fun unchangedExpiration_shouldBePositive_whenFilterIsUnexpired() {
        val expiresInSeconds = 3600
        val expiredDate = Date.from(Instant.now().plusSeconds(expiresInSeconds.toLong()))
        val updatedDuration = getSecondsForDurationIndex(-1, null, expiredDate)
        assert(updatedDuration != null && updatedDuration > (expiresInSeconds - 60))
    }

    companion object {
        fun mockStatus(
            content: String = "",
            spoilerText: String = "",
            pollOptions: List<String>? = null,
            attachmentsDescriptions: List<String>? = null
        ): Status {
            return Status(
                id = "123",
                url = "https://mastodon.social/@Tusky/100571663297225812",
                account = mock(),
                inReplyToId = null,
                inReplyToAccountId = null,
                reblog = null,
                content = content,
                createdAt = Date(),
                editedAt = null,
                emojis = emptyList(),
                reblogsCount = 0,
                favouritesCount = 0,
                repliesCount = 0,
                reblogged = false,
                favourited = false,
                bookmarked = false,
                sensitive = false,
                spoilerText = spoilerText,
                visibility = Status.Visibility.PUBLIC,
                attachments = if (attachmentsDescriptions != null) {
                    ArrayList(
                        attachmentsDescriptions.map {
                            Attachment(
                                id = "1234",
                                url = "",
                                previewUrl = null,
                                meta = null,
                                type = Attachment.Type.IMAGE,
                                description = it,
                                blurhash = null
                            )
                        }
                    )
                } else arrayListOf(),
                mentions = listOf(),
                tags = listOf(),
                application = null,
                pinned = false,
                muted = false,
                poll = if (pollOptions != null) {
                    Poll(
                        id = "1234",
                        expiresAt = null,
                        expired = false,
                        multiple = false,
                        votesCount = 0,
                        votersCount = 0,
                        options = pollOptions.map {
                            PollOption(it, 0)
                        },
                        voted = false,
                        ownVotes = null
                    )
                } else null,
                card = null,
                language = null,
            )
        }
    }
}