package dev.castarr.tv.data

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

/**
 * Shapes taken from the household's own Dispatcharr fork. The backend path
 * had no coverage at all, and the first run against a real instance found
 * three bugs — these are the shapes that produced them.
 */
class DispatcharrJsonTest {

    private fun streamUrl(uuid: String) = "https://tv.example/proxy/ts/stream/$uuid"
    private fun logoUrl(id: Int) = "https://tv.example/api/channels/logos/$id/cache/"

    private val groups = mapOf(1 to "Free TV / HD+", 2 to "Sky Sport")

    @Test
    fun `a paginated page yields its channels`() {
        val body = """
            {"count": 2, "next": null, "results": [
              {"id": 12, "uuid": "aaa", "name": "Das Erste", "effective_name": "Das Erste HD",
               "channel_group_id": 1, "effective_logo_id": 7, "effective_tvg_id": "ard.de"},
              {"id": 13, "uuid": "bbb", "name": "ZDF HD", "channel_group_id": 1, "logo_id": 8}
            ]}
        """.trimIndent()
        val channels = DispatcharrJson.parseChannels(body, groups, ::streamUrl, ::logoUrl)
        assertEquals(2, channels.size)
        val first = channels.first()
        assertEquals("Das Erste HD", first.name)
        assertEquals("Free TV / HD+", first.group)
        assertEquals("ard.de", first.tvgId)
        assertEquals(12, first.backendId)
        assertEquals("https://tv.example/proxy/ts/stream/aaa", first.url)
        assertEquals("https://tv.example/api/channels/logos/7/cache/", first.logo)
        // Without an effective name the plain one is used, same for the logo.
        assertEquals("ZDF HD", channels[1].name)
        assertEquals("https://tv.example/api/channels/logos/8/cache/", channels[1].logo)
    }

    /** The proxy resolves by uuid; an integer id gives a 404. */
    @Test
    fun `a channel without uuid is dropped`() {
        val body = """{"results": [{"id": 1, "uuid": "", "name": "Kaputt"}]}"""
        assertTrue(DispatcharrJson.parseChannels(body, groups, ::streamUrl, ::logoUrl).isEmpty())
    }

    @Test
    fun `a channel hidden from output is dropped`() {
        val body = """
            {"results": [{"id": 1, "uuid": "aaa", "name": "Intern", "hidden_from_output": true}]}
        """.trimIndent()
        assertTrue(DispatcharrJson.parseChannels(body, groups, ::streamUrl, ::logoUrl).isEmpty())
    }

    @Test
    fun `an unknown group leaves the group empty instead of failing`() {
        val body = """{"results": [{"id": 1, "uuid": "aaa", "name": "X", "channel_group_id": 99}]}"""
        assertEquals("", DispatcharrJson.parseChannels(body, groups, ::streamUrl, ::logoUrl).first().group)
    }

    @Test
    fun `a bare array works like a paginated page`() {
        val body = """[{"id": 5, "uuid": "ccc", "name": "Bar"}]"""
        assertEquals(1, DispatcharrJson.parseChannels(body, groups, ::streamUrl, ::logoUrl).size)
    }

    @Test
    fun `the next page is followed only while there is one`() {
        assertEquals(
            "https://tv.example/api/channels/channels/?page=2",
            DispatcharrJson.nextPage("""{"next": "https://tv.example/api/channels/channels/?page=2"}"""),
        )
        assertNull(DispatcharrJson.nextPage("""{"next": null}"""))
        assertNull(DispatcharrJson.nextPage("""{"next": ""}"""))
        assertNull(DispatcharrJson.nextPage("""[{"id": 1}]"""))
    }

    @Test
    fun `groups come back as id to name`() {
        val body = """{"results": [{"id": 1, "name": "Free TV / HD+"}, {"id": 2, "name": "Sky Sport"}]}"""
        assertEquals(groups, DispatcharrJson.parseGroups(body))
    }

    @Test
    fun `favourites are the ids under channels`() {
        assertEquals(setOf(46, 118), DispatcharrJson.parseFavorites("""{"channels": [46, 118]}"""))
        assertEquals(emptySet<Int>(), DispatcharrJson.parseFavorites("""{"channels": []}"""))
        // A user who never starred anything gets an envelope without the key.
        assertEquals(emptySet<Int>(), DispatcharrJson.parseFavorites("""{}"""))
    }

    @Test
    fun `inactive output profiles are not offered`() {
        val body = """
            {"results": [
              {"name": "raw", "is_active": true},
              {"name": "alt", "is_active": false},
              {"name": "default"}
            ]}
        """.trimIndent()
        assertEquals(listOf("raw", "default"), DispatcharrJson.parseProfiles(body))
    }

    @Test
    fun `the epg grid is keyed by tvg id and sorted`() {
        val body = """
            {"data": [
              {"tvg_id": "ard.de", "title": "Tagesschau",
               "start_time": "2026-08-26T18:00:00Z", "end_time": "2026-08-26T18:15:00Z"},
              {"tvg_id": "ard.de", "title": "Sportschau",
               "start_time": "2026-08-26T17:00:00Z", "end_time": "2026-08-26T18:00:00Z"}
            ]}
        """.trimIndent()
        val grid = DispatcharrJson.parseEpgGrid(body)
        assertEquals(listOf("Sportschau", "Tagesschau"), grid.getValue("ard.de").map { it.title })
    }

    @Test
    fun `grid entries without a usable time or id are skipped`() {
        val body = """
            {"data": [
              {"tvg_id": "", "title": "Ohne Sender",
               "start_time": "2026-08-26T18:00:00Z", "end_time": "2026-08-26T18:15:00Z"},
              {"tvg_id": "zdf.de", "title": "Kaputte Zeit",
               "start_time": "kein Datum", "end_time": "2026-08-26T18:15:00Z"},
              {"tvg_id": "zdf.de", "title": "Ende vor Start",
               "start_time": "2026-08-26T18:15:00Z", "end_time": "2026-08-26T18:00:00Z"}
            ]}
        """.trimIndent()
        assertTrue(DispatcharrJson.parseEpgGrid(body).isEmpty())
    }

    /** The fork has shipped "data", "results" and a bare array over time. */
    @Test
    fun `all three grid envelopes are accepted`() {
        val entry = """{"tvg_id": "ard.de", "title": "X",
            "start_time": "2026-08-26T18:00:00Z", "end_time": "2026-08-26T18:15:00Z"}"""
        listOf("""{"data": [$entry]}""", """{"results": [$entry]}""", """[$entry]""").forEach { body ->
            assertEquals(1, DispatcharrJson.parseEpgGrid(body).getValue("ard.de").size)
        }
    }
}