/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package mozilla.components.browser.icons.decoder

import androidx.test.ext.junit.runners.AndroidJUnit4
import mozilla.components.browser.icons.decoder.ico.IconDirectoryEntry
import mozilla.components.browser.icons.decoder.ico.decodeDirectoryEntries
import mozilla.components.support.images.DesiredSize
import org.junit.Assert.assertEquals
import org.junit.Assert.assertNotNull
import org.junit.Test
import org.junit.runner.RunWith

@RunWith(AndroidJUnit4::class)
class ICOIconDecoderTest {

    @Test
    fun `Decoding microsoft favicon`() {
        val icon = loadIcon("microsoft_favicon.ico")
        val decoder = ICOIconDecoder()

        val bitmap = decoder.decode(icon, DesiredSize(192, 1024, 2.0f))
        assertNotNull(bitmap)
    }

    @Test
    fun `Decoding golem favicon`() {
        val icon = loadIcon("golem_favicon.ico")
        val decoder = ICOIconDecoder()

        val bitmap = decoder.decode(icon, DesiredSize(192, 1024, 2.0f))
        assertNotNull(bitmap)
    }

    @Test
    fun `Decoding nivida favicon`() {
        val icon = loadIcon("nvidia_favicon.ico")
        val decoder = ICOIconDecoder()

        val bitmap = decoder.decode(icon, DesiredSize(96, 1024, 2.0f))
        assertNotNull(bitmap)
    }

    @Test
    fun testGolemIconEntries() {
        val icon = loadIcon("golem_favicon.ico")

        val entries = decodeDirectoryEntries(icon, 1024)
        assertEquals(5, entries.size)

        val expectedEntries = arrayOf(
            IconDirectoryEntry(
                16, 16, 0, 32, 1128, 39520, false, 4),
            IconDirectoryEntry(
                24, 24, 0, 32, 2488, 37032, false, 3),
            IconDirectoryEntry(
                32, 32, 0, 32, 4392, 32640, false, 2),
            IconDirectoryEntry(
                48, 48, 0, 32, 9832, 22808, false, 1),
            IconDirectoryEntry(
                256, 256, 0, 32, 22722, 86, true, 0)
        )

        entries
            .sortedBy { entry -> entry.width }
            .forEachIndexed { index, entry ->
                assertEquals(expectedEntries[index], entry)
            }
    }

    @Test
    fun testNvidiaIconEntries() {
        val icon = loadIcon("nvidia_favicon.ico")

        val entries = decodeDirectoryEntries(icon, 1024)
        assertEquals(3, entries.size)

        // Verify the best entry is correctly chosen for each width. We expect 32 bpp in all cases.
        val expectedEntries = arrayOf(
            IconDirectoryEntry(
                16, 16, 0, 32, 1128, 24086, false, 8),
            IconDirectoryEntry(
                32, 32, 0, 32, 4264, 19822, false, 7),
            IconDirectoryEntry(
                48, 48, 0, 32, 9640, 10182, false, 6)
        )

        entries
            .sortedBy { entry -> entry.width }
            .forEachIndexed { index, entry -> assertEquals(expectedEntries[index], entry) }
    }

    @Test
    fun testMicrosoftIconEntries() {
        val icon = loadIcon("microsoft_favicon.ico")

        val entries = decodeDirectoryEntries(icon, 1024)
        assertEquals(6, entries.size)

        val expectedEntries = arrayOf(
            IconDirectoryEntry(
                128, 128, 16, 0, 10344, 102, false, 0),
            IconDirectoryEntry(
                72, 72, 16, 0, 3560, 10446, false, 1),
            IconDirectoryEntry(
                48, 48, 16, 0, 1640, 14006, false, 2),
            IconDirectoryEntry(
                32, 32, 16, 0, 744, 15646, false, 3),
            IconDirectoryEntry(
                24, 24, 16, 0, 488, 16390, false, 4),
            IconDirectoryEntry(
                16, 16, 16, 0, 296, 16878, false, 5)
        )

        entries
            .sortedByDescending { entry -> entry.width }
            .forEachIndexed { index, entry -> assertEquals(expectedEntries[index], entry) }
    }

    private fun loadIcon(fileName: String): ByteArray =
        javaClass.getResourceAsStream("/ico/$fileName")!!
            .buffered()
            .readBytes()
}
