package prog8tests.codegeneration

import io.kotest.core.spec.style.FunSpec
import io.kotest.matchers.ints.shouldBeGreaterThan
import io.kotest.matchers.shouldBe
import io.kotest.matchers.shouldNotBe
import io.kotest.matchers.string.shouldContain
import io.kotest.matchers.string.shouldStartWith
import io.kotest.matchers.types.instanceOf
import prog8.code.ast.PtArrayIndexer
import prog8.code.ast.PtAssignment
import prog8.code.ast.PtVariable
import prog8.code.core.DataType
import prog8.code.target.C64Target
import prog8.code.target.VMTarget
import prog8tests.helpers.ErrorReporterForTests
import prog8tests.helpers.compileText

class TestVariousCodeGen: FunSpec({
    test("bool to byte cast in expression is correct") {
        val text="""
main {
    sub start() {
        ubyte[3] values
        func(22 in values)
        ubyte @shared qq = 22 in values
    }
    sub func(ubyte arg) {
        arg++
    }
}"""
        compileText(C64Target(), false, text, writeAssembly = true) shouldNotBe null
    }

    test("nested scoping") {
        val text="""
main {
    sub start() {
        testscope.duplicate()
        cx16.r0L = testscope.duplicate2()
    }
}

testscope {

    sub sub1() {
        ubyte @shared duplicate
        ubyte @shared duplicate2
    }

    sub duplicate() {
        ; do nothing
    }

    sub duplicate2() -> ubyte {
        return cx16.r0L
    }
}"""
        compileText(C64Target(), false, text, writeAssembly = true) shouldNotBe null
    }

    test("word array indexing") {
        val text="""
main {
    sub start() {
        uword[3] seed
        cx16.r0 = seed[0] + seed[1] + seed[2]
    }
}"""
        compileText(C64Target(), false, text, writeAssembly = true) shouldNotBe null
    }


    test("ast result from compileText") {
        val text="""
main {
    sub start() {
        uword[3] seed
        cx16.r0 = seed[0] + seed[1] + seed[2]
    }
}"""
        val result = compileText(C64Target(), false, text, writeAssembly = true)!!
        result.compilerAst.name shouldStartWith  "on_the_fly"
        result.codegenAst!!.name shouldBe result.compilerAst.name
        result.codegenAst!!.children.size shouldBeGreaterThan 2
        val start = result.codegenAst!!.entrypoint()!!
        start.name shouldBe "start"
        start.children.size shouldBeGreaterThan 2
        val seed = start.children[0] as PtVariable
        seed.name shouldBe "seed"
        seed.value shouldBe null
        seed.type shouldBe DataType.ARRAY_UW
        val assign = start.children[1] as PtAssignment
        assign.target.identifier!!.name shouldBe "cx16.r0"
        assign.value shouldBe instanceOf<PtArrayIndexer>()
    }

    test("peek and poke argument types") {
        val text="""
main {
    sub start() {
        uword[3] arr
        ubyte i = 42
        uword ww = peekw(arr[i])
        ubyte xx = peek(arr[i])
        xx = @(arr[i])
        
        @(arr[i]) = 42
        poke(arr[i], 42)
        pokew(arr[i], 4242)
    }
}"""
        compileText(C64Target(), false, text, writeAssembly = true) shouldNotBe null
    }

    test("assigning memory byte into arrays works") {
        val text="""
main {
    sub start() {
        uword factor1
        ubyte[3] bytearray
        uword[3] wordarray
        @(factor1) = bytearray[0]
        bytearray[0] = @(factor1)
        @(factor1) = lsb(wordarray[0])
        wordarray[0] = @(factor1)
        @(5000) = bytearray[0]
        @(5000) = lsb(wordarray[0])
        bytearray[0] = @(5000)
        wordarray[0] = @(5000)
    }
}"""
        compileText(C64Target(), false, text, writeAssembly = true) shouldNotBe null
    }

    test("reading memory from unknown var gives proper error") {
        val text="""
main {
    sub start() {
        cx16.r0L = @(doesnotexist)
    }
}"""
        val errors = ErrorReporterForTests()
        compileText(C64Target(), false, text, writeAssembly = true, errors = errors)
        errors.errors.size shouldBe 1
        errors.errors[0] shouldContain "undefined symbol: doesnotexist"
    }

    test("shifting by word value is ok") {
        val text="""
main {
    sub start() {
        ubyte c = 1
        @(15000 + c<<${'$'}0003) = 42
        @(15000 + (c<<${'$'}0003)) = 42
        @(15000 + c*${'$'}0008) = 42       ; *8 becomes a shift after opt

        uword @shared qq = 15000 + c<<${'$'}0003
        qq = 15000 + (c<<${'$'}0003)
        qq = 16000 + c*${'$'}0008
    }
}"""
        compileText(C64Target(), true, text, writeAssembly = true, useNewExprCode = false) shouldNotBe null
        compileText(VMTarget(), true, text, writeAssembly = true, useNewExprCode = false) shouldNotBe null
        compileText(C64Target(), true, text, writeAssembly = true, useNewExprCode = true) shouldNotBe null
        // no newexpr for IR targets: compileText(VMTarget(), true, text, writeAssembly = true, useNewExprCode = true) shouldNotBe null
    }
})