package dev.castarr.tv.update

import org.junit.Assert.assertFalse
import org.junit.Assert.assertTrue
import org.junit.Test

class UpdateRulesTest {

    @Test
    fun `a higher patch level is newer`() {
        assertTrue(UpdateRules.isNewer("0.11.5", "0.11.4"))
    }

    @Test
    fun `the same version is not newer`() {
        assertFalse(UpdateRules.isNewer("0.11.5", "0.11.5"))
    }

    @Test
    fun `an older release never offers itself as an update`() {
        assertFalse(UpdateRules.isNewer("0.11.4", "0.11.5"))
    }

    /** Segments are numbers, not text — "10" beats "9". */
    @Test
    fun `double digit segments compare numerically`() {
        assertTrue(UpdateRules.isNewer("0.11.10", "0.11.9"))
        assertFalse(UpdateRules.isNewer("0.11.9", "0.11.10"))
        assertTrue(UpdateRules.isNewer("0.12.0", "0.9.99"))
    }

    @Test
    fun `a missing segment counts as zero`() {
        assertFalse(UpdateRules.isNewer("0.12", "0.12.0"))
        assertTrue(UpdateRules.isNewer("0.12.1", "0.12"))
    }

    @Test
    fun `a leading v on the tag makes no difference`() {
        assertTrue(UpdateRules.isNewer("v0.11.5", "0.11.4"))
        assertFalse(UpdateRules.isNewer("v0.11.4", "v0.11.4"))
    }

    @Test
    fun `garbage in a tag does not offer an update`() {
        assertFalse(UpdateRules.isNewer("", "0.11.5"))
        assertFalse(UpdateRules.isNewer("nightly", "0.11.5"))
    }

    @Test
    fun `a complete download passes`() {
        assertTrue(UpdateRules.isComplete(actualBytes = 6_515_429, announcedBytes = 6_515_429))
    }

    /** The 0.11.5 bug: a truncated APK left the installer hanging. */
    @Test
    fun `a truncated download is rejected`() {
        assertFalse(UpdateRules.isComplete(actualBytes = 3_000_000, announcedBytes = 6_515_429))
    }

    @Test
    fun `an empty download is rejected even when nothing was announced`() {
        assertFalse(UpdateRules.isComplete(actualBytes = 0, announcedBytes = -1))
        assertFalse(UpdateRules.isComplete(actualBytes = 0, announcedBytes = 0))
    }

    @Test
    fun `an unannounced length cannot be checked, so any content passes`() {
        assertTrue(UpdateRules.isComplete(actualBytes = 6_515_429, announcedBytes = -1))
    }

    @Test
    fun `more bytes than announced is rejected too`() {
        assertFalse(UpdateRules.isComplete(actualBytes = 7_000_000, announcedBytes = 6_515_429))
    }
}