package dev.castarr.tv.data

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

class DuplicateProgrammesTest {

    private fun p(startMin: Int, stopMin: Int, title: String) =
        Programme(startMin * 60_000L, stopMin * 60_000L, title)

    /** The real case: one channel, one episode, three EPG entries. */
    @Test
    fun `repeats a few minutes apart collapse into one`() {
        val collapsed = XmltvParser.collapseDuplicates(
            listOf(
                p(1090, 1140, "The Big Bang Theory"),
                p(1095, 1145, "The Big Bang Theory"),
                p(1120, 1170, "The Big Bang Theory"),
            )
        )
        assertEquals(1, collapsed.size)
        assertEquals(1090 * 60_000L, collapsed.first().start)
    }

    @Test
    fun `a genuine repeat later in the evening survives`() {
        val collapsed = XmltvParser.collapseDuplicates(
            listOf(
                p(1090, 1140, "Tagesschau"),
                p(1300, 1320, "Tagesschau"),
            )
        )
        assertEquals(2, collapsed.size)
    }

    @Test
    fun `different programmes at the same time both stay`() {
        val collapsed = XmltvParser.collapseDuplicates(
            listOf(
                p(1090, 1140, "Sportschau"),
                p(1092, 1142, "Tagesschau"),
            )
        )
        assertEquals(2, collapsed.size)
    }

    @Test
    fun `a repeat inside the first slot collapses even beyond the tolerance`() {
        val collapsed = XmltvParser.collapseDuplicates(
            listOf(
                p(1000, 1200, "Fußball: Konferenz"),
                p(1100, 1300, "Fußball: Konferenz"),
            )
        )
        assertEquals(1, collapsed.size)
    }

    @Test
    fun `an unsorted list is handled in time order`() {
        val collapsed = XmltvParser.collapseDuplicates(
            listOf(
                p(1095, 1145, "Two and a Half Men"),
                p(1090, 1140, "Two and a Half Men"),
            )
        )
        assertEquals(1, collapsed.size)
        assertEquals(1090 * 60_000L, collapsed.first().start)
    }

    @Test
    fun `an empty list stays empty`() {
        assertEquals(emptyList<Programme>(), XmltvParser.collapseDuplicates(emptyList()))
    }
}