package cash.z.ecc.android.integration

import android.content.Context
import androidx.test.ext.junit.runners.AndroidJUnit4
import androidx.test.platform.app.InstrumentationRegistry
import cash.z.ecc.android.lockbox.LockBox
import cash.z.ecc.android.sdk.Initializer
import cash.z.ecc.android.sdk.model.ZcashNetwork
import cash.z.ecc.kotlin.mnemonic.Mnemonics
import kotlinx.coroutines.test.runTest
import okio.Buffer
import okio.GzipSink
import okio.buffer
import org.junit.Assert.assertEquals
import org.junit.Assert.assertTrue
import org.junit.Before
import org.junit.Ignore
import org.junit.Test
import org.junit.runner.RunWith

@RunWith(AndroidJUnit4::class)
class IntegrationTest {

    private lateinit var appContext: Context
    private val network = ZcashNetwork.Testnet
    private val mnemonics = Mnemonics()
    private val phrase =
        "human pulse approve subway climb stairs mind gentle raccoon warfare fog roast sponsor" +
            " under absorb spirit hurdle animal original honey owner upper empower describe"

    @Before
    fun start() {
        appContext = InstrumentationRegistry.getInstrumentation().targetContext
    }

    @Test
    fun testSeed_generation() {
        val seed = mnemonics.toSeed(phrase.toCharArray())
        assertEquals(
            "Generated incorrect BIP-39 seed!",
            "f4e3d38d9c244da7d0407e19a93c80429614ee82dcf62c141235751c9f1228905d12a1f275f" +
                "5c22f6fb7fcd9e0a97f1676e0eec53fdeeeafe8ce8aa39639b9fe",
            seed.toHex()
        )
    }

    @Test
    fun testSeed_storage() {
        val seed = mnemonics.toSeed(phrase.toCharArray())
        val lb = LockBox(appContext)
        lb.setBytes("seed", seed)
        assertTrue(seed.contentEquals(lb.getBytes("seed")!!))
    }

    @Test
    fun testPhrase_storage() {
        val lb = LockBox(appContext)
        val phraseChars = phrase.toCharArray()
        lb.setCharsUtf8("phrase", phraseChars)
        assertTrue(phraseChars.contentEquals(lb.getCharsUtf8("phrase")!!))
    }

    @Test
    fun testPhrase_maxLengthStorage() {
        val lb = LockBox(appContext)
        // find and expose the max length
        var acceptedSize = 256
        while (acceptedSize > 0) {
            try {
                lb.setCharsUtf8("temp", nextString(acceptedSize).toCharArray())
                break
            } catch (t: Throwable) {
            }
            acceptedSize--
        }

        val maxSeedPhraseLength = 8 * 24 + 23 // 215 (max length of each word is 8)
        assertTrue(
            "LockBox does not support the maximum length seed phrase." +
                " Expected: $maxSeedPhraseLength but was: $acceptedSize",
            acceptedSize > maxSeedPhraseLength
        )
    }

    @Test
    @Ignore("It'd need additional implementation changes to have this one working.")
    fun testAddress() = runTest {
        val seed = mnemonics.toSeed(phrase.toCharArray())
        val initializer = Initializer.new(appContext) { config ->
            // config.newWallet(seed, network)
        }
        assertEquals(
            "Generated incorrect z-address!",
            "zs1gn2ah0zqhsxnrqwuvwmgxpl5h3ha033qexhsz8tems53fw877f4gug353eefd6z8z3n4zxty65c",
            // initializer.rustBackend.getShieldedAddress()
        )
        initializer.erase()
    }

    private fun ByteArray.toHex(): String {
        val sb = StringBuilder(size * 2)
        for (b in this)
            sb.append(String.format("%02x", b))
        return sb.toString()
    }

    fun String.gzip(): ByteArray {
        val result = Buffer()
        val sink = GzipSink(result).buffer()
        sink.use {
            sink.write(toByteArray())
        }
        return result.readByteArray()
    }

    fun nextString(length: Int): String {
        val allowedChars = "ACGT"
        return (1..length)
            .map { allowedChars.random() }
            .joinToString("")
    }
}