package prog8tests

import io.kotest.core.spec.style.FunSpec
import io.kotest.matchers.shouldBe
import io.kotest.matchers.shouldNotBe
import prog8.ast.expressions.NumericLiteral
import prog8.ast.statements.Assignment
import prog8.code.core.BuiltinFunctions
import prog8.code.core.DataType
import prog8.code.core.NumericDatatypesNoBool
import prog8.code.core.RegisterOrPair
import prog8.code.target.Cx16Target
import prog8tests.helpers.compileText

class TestBuiltinFunctions: FunSpec({

    test("pure func with fixed type") {
        val func = BuiltinFunctions.getValue("sgn")
        func.parameters.size shouldBe 1
        func.parameters[0].name shouldBe "value"
        func.parameters[0].possibleDatatypes shouldBe NumericDatatypesNoBool
        func.pure shouldBe true
        func.returnType shouldBe DataType.BYTE

        val conv = func.callConvention(listOf(DataType.UBYTE))
        conv.params.size shouldBe 1
        conv.params[0].dt shouldBe DataType.UBYTE
        conv.params[0].reg shouldBe RegisterOrPair.A
        conv.params[0].variable shouldBe false
        conv.returns.dt shouldBe DataType.BYTE
        conv.returns.floatFac1 shouldBe false
        conv.returns.reg shouldBe RegisterOrPair.A
    }

    test("not-pure func with varying result value type") {
        val func = BuiltinFunctions.getValue("cmp")
        func.parameters.size shouldBe 2
        func.pure shouldBe false
        func.returnType shouldBe null

        val conv = func.callConvention(listOf(DataType.UWORD, DataType.UWORD))
        conv.params.size shouldBe 2
        conv.returns.dt shouldBe null
        conv.returns.floatFac1 shouldBe false
        conv.returns.reg shouldBe null
    }

    test("func without return type") {
        val func = BuiltinFunctions.getValue("poke")
        func.parameters.size shouldBe 2
        func.parameters[0].name shouldBe "address"
        func.parameters[0].possibleDatatypes shouldBe arrayOf(DataType.UWORD)
        func.parameters[1].name shouldBe "value"
        func.parameters[1].possibleDatatypes shouldBe arrayOf(DataType.UBYTE)
        func.pure shouldBe false
        func.returnType shouldBe null

        val conv = func.callConvention(listOf(DataType.UWORD, DataType.UBYTE))
        conv.params.size shouldBe 2
        conv.params[0].dt shouldBe DataType.UWORD
        conv.params[0].reg shouldBe null
        conv.params[0].variable shouldBe true
        conv.params[1].dt shouldBe DataType.UBYTE
        conv.params[1].reg shouldBe null
        conv.params[1].variable shouldBe true
        conv.returns.dt shouldBe null
        conv.returns.floatFac1 shouldBe false
        conv.returns.reg shouldBe null
    }

    test("push pop") {
        val src="""
            main  {
                sub start () { 
                    pushw(cx16.r0)
                    push(cx16.r1L)
                    pop(cx16.r1L)
                    popw(cx16.r0)
                }
            }"""
        compileText(Cx16Target(), false, src, writeAssembly = true) shouldNotBe null
    }

    test("certain builtin functions should be compile time evaluated") {
        val src="""
main {
    sub start() {

        uword[] array = [1,2,3]
        str name = "hello"
        cx16.r0L = len(array)
        cx16.r0L = len(name)
        cx16.r0L = sizeof(array)
        cx16.r0 = mkword(200,100)
    }
}"""
        val result = compileText(Cx16Target(), false, src, writeAssembly = false)
        val statements = result!!.compilerAst.entrypoint.statements
        statements.size shouldBe 6
        val a1 = statements[2] as Assignment
        val a2 = statements[3] as Assignment
        val a3 = statements[4] as Assignment
        val a4 = statements[5] as Assignment
        (a1.value as NumericLiteral).number shouldBe 3.0
        (a2.value as NumericLiteral).number shouldBe 5.0
        (a3.value as NumericLiteral).number shouldBe 6.0
        (a4.value as NumericLiteral).number shouldBe 200*256+100
    }
})