package dev.castarr.tv

import org.junit.Assert.assertEquals
import org.junit.Assert.assertTrue
import org.junit.Test

class CrashLogTest {

    @Test
    fun `an entry names the time, the version and the top of the stack`() {
        val error = IllegalStateException("Senderliste leer")
        // 26.08.2026, 19:12 (MESZ)
        val entry = CrashLog.render(1787764320000L, "0.12.0", error)
        val lines = entry.lines()
        assertTrue(lines.first().contains("0.12.0"))
        assertTrue(lines.first().contains("26.08.2026"))
        assertTrue(entry.contains("IllegalStateException"))
        assertTrue(entry.contains("Senderliste leer"))
    }

    @Test
    fun `a long stack is cut down to something readable`() {
        val error = RuntimeException("tief")
        val entry = CrashLog.render(0L, "0.12.0", error)
        // Kopfzeile plus höchstens TRACE_LINES Zeilen Stack.
        assertTrue(entry.lines().size <= CrashLog.TRACE_LINES + 1)
    }

    @Test
    fun `only the newest entries are kept`() {
        val entries = (1..15).map { "Absturz $it" }
        val kept = CrashLog.trim(entries)
        assertEquals(CrashLog.KEEP, kept.size)
        assertEquals("Absturz 15", kept.last())
        assertEquals("Absturz 6", kept.first())
    }

    @Test
    fun `blank entries are dropped instead of counting`() {
        assertEquals(listOf("echt"), CrashLog.trim(listOf("", "  ", "echt")))
    }

    @Test
    fun `nothing recorded stays nothing`() {
        assertEquals(emptyList<String>(), CrashLog.trim(emptyList()))
    }
}