package attribute_test

import (
    "testing"

    "gitlab.codemonkeysoftware.net/b/hatmill"
    "gitlab.codemonkeysoftware.net/b/hatmill/attribute"
)

func testAttribValue(t *testing.T, attrib hatmill.Attrib, expectedValue string) {
    t.Helper()
    if attrib.Value != expectedValue {
        t.Fatalf("expected attribute value to be %#v, but got %#v", expectedValue, attrib.Value)
    }
}

func TestSpaceList(t *testing.T) {
    t.Run("empty", func(t *testing.T) {
        testAttribValue(t, attribute.Class(), "")
    })
    t.Run("nonempty", func(t *testing.T) {
        testAttribValue(t, attribute.Class("alpha", "bravo", "charlie"), "alpha bravo charlie")
    })
}

func TestString(t *testing.T) {
    const s = "abcdefg"
    testAttribValue(t, attribute.Id(s), s)
}

func TestBool(t *testing.T) {
    testAttribValue(t, attribute.Disabled(), "")
}

func TestExplicitBool(t *testing.T) {
    t.Run("true", func(t *testing.T) {
        testAttribValue(t, attribute.Draggable(true), "true")
    })
    t.Run("false", func(t *testing.T) {
        testAttribValue(t, attribute.Draggable(false), "false")
    })
}

func TestInt(t *testing.T) {
    t.Run("zero", func(t *testing.T) {
        testAttribValue(t, attribute.Height(0), "0")
    })
    t.Run("positive", func(t *testing.T) {
        testAttribValue(t, attribute.Height(45), "45")
    })
    t.Run("negative", func(t *testing.T) {
        testAttribValue(t, attribute.Tabindex(-45), "-45")
    })
}

func TestFloat(t *testing.T) {
    for _, testcase := range []struct{
        name string
        f float32
        value string
    } {
        {name: "zero", f: 0, value: "0"},
        {name: "integral", f: 45, value: "45"},
        {name: "positive fractional, small positive exponent", f: 12.55, value: "12.55"},
        {name: "positive fractional, large positive exponent", f: 1.55E+12, value: "1.55E+12"},
        {name: "positive fractional, large negative exponent", f: 1.55E-12, value: "1.55E-12"},
        {name: "negative fractional, small positive exponent", f: -12.55, value: "-12.55"},
        {name: "negative fractional, large positive exponent", f: -1.55E+12, value: "-1.55E+12"},
        {name: "negative fractional, large negative exponent", f: -1.55E-12, value: "-1.55E-12"},
    } {
        t.Run(testcase.name, func(t *testing.T) {
            testAttribValue(t, attribute.Min(testcase.f), testcase.value)
        })
    }
}