package dev.dtrentin.chart.render

import dev.dtrentin.chart.model.ChartConfig
import dev.dtrentin.chart.model.DataConfig
import dev.dtrentin.chart.model.YRange
import kotlin.test.Test
import kotlin.test.assertEquals
import kotlin.test.assertTrue

class AxisRendererTest {

    // T9: resolveYRange writes into out param (Fixed range).
    @Test fun resolveYRange_writesIntoOutArray_fixed() {
        val cfg = ChartConfig(data = DataConfig(yRange = YRange.Fixed(min = -5f, max = 12f)))
        val out = FloatArray(2)
        AxisRenderer.resolveYRange(cfg, dataMin = -100f, dataMax = 100f, outYRange = out)
        assertEquals(-5f, out[0])
        assertEquals(12f, out[1])
    }

    // T9: resolveYRange writes into out param (Auto with padding).
    @Test fun resolveYRange_writesIntoOutArray_autoWithPadding() {
        val cfg = ChartConfig(data = DataConfig(yRange = YRange.Auto(paddingFraction = 0.1f)))
        val out = FloatArray(2)
        AxisRenderer.resolveYRange(cfg, dataMin = 0f, dataMax = 10f, outYRange = out)
        // padding = (10 - 0) * 0.1 = 1 → expect [-1, 11].
        assertEquals(-1f, out[0])
        assertEquals(11f, out[1])
    }

    // T9: resolveYRange handles flat data — uses range floor 1e-6 to avoid div-by-zero.
    // With paddingFraction 0.1 and floor 1e-6, the effective padding is 1e-7. Below Float
    // resolution at value 5f, so out[0] == out[1] == 5f is permitted (downstream renderers
    // re-apply their own (yMax-yMin).coerceAtLeast(1e-6f)). Just assert no NaN/Infinity.
    @Test fun resolveYRange_flatData_writesFiniteValues() {
        val cfg = ChartConfig(data = DataConfig(yRange = YRange.Auto(paddingFraction = 0.1f)))
        val out = FloatArray(2)
        AxisRenderer.resolveYRange(cfg, dataMin = 5f, dataMax = 5f, outYRange = out)
        assertTrue(out[0].isFinite())
        assertTrue(out[1].isFinite())
        assertTrue(out[1] >= out[0])
    }
}