package prog8tests

import org.junit.jupiter.api.Test
import org.junit.jupiter.api.TestInstance
import prog8.ast.expressions.NumericLiteralValue
import prog8.ast.statements.*
import prog8.compiler.target.C64Target
import prog8tests.helpers.assertSuccess
import prog8tests.helpers.compileText
import kotlin.test.assertEquals
import kotlin.test.assertFalse
import kotlin.test.assertTrue


@TestInstance(TestInstance.Lifecycle.PER_CLASS)
class TestScoping {

    @Test
    fun testAnonScopeVarsMovedIntoSubroutineScope() {
        val src = """
            main {
                sub start() {
                    repeat {
                        ubyte xx = 99
                        xx++
                    }
                }
            }
        """

        val result = compileText(C64Target, false, src, writeAssembly = false).assertSuccess()
        val module = result.programAst.toplevelModule
        val mainBlock = module.statements.single() as Block
        val start = mainBlock.statements.single() as Subroutine
        val repeatbody = start.statements.filterIsInstance<RepeatLoop>().single().body
        assertFalse(mainBlock.statements.any { it is VarDecl }, "no vars moved to main block")
        val subroutineVars = start.statements.filterIsInstance<VarDecl>()
        assertEquals(1, subroutineVars.size, "var from repeat anonscope must be moved up to subroutine")
        assertEquals("xx", subroutineVars[0].name)
        assertFalse(repeatbody.statements.any { it is VarDecl }, "var should have been removed from repeat anonscope")
        val initassign = repeatbody.statements[0] as? Assignment
        assertEquals(listOf("xx"), initassign?.target?.identifier?.nameInSource, "vardecl in repeat should be replaced by init assignment")
        assertEquals(99, (initassign?.value as? NumericLiteralValue)?.number?.toInt(), "vardecl in repeat should be replaced by init assignment")
        assertTrue(repeatbody.statements[1] is PostIncrDecr)
    }

    @Test
    fun testLabelsWithAnonScopes() {
        val src = """
            main {
                sub start() {
                    uword addr
                    goto labeloutside
        
                    if true {
                        if true {
                            addr = &iflabel
                            addr = &labelinside
                            addr = &labeloutside
                            addr = &main.start.nested.nestedlabel
                            ; addr = &nested.nestedlabel      ; TODO should also work!!
                            goto labeloutside
                            goto iflabel
                            goto main.start.nested.nestedlabel
                            ; goto nested.nestedlabel         ; TODO should also work!!
                        }
            iflabel:
                    }
        
                    repeat {
                        addr = &iflabel
                        addr = &labelinside
                        addr = &labeloutside
                        addr = &main.start.nested.nestedlabel
                        ; addr = &nested.nestedlabel      ; TODO should also work!!
                        goto iflabel
                        goto labelinside
                        goto main.start.nested.nestedlabel
                        ; goto nested.nestedlabel         ; TODO should also work!!
            labelinside:
                    }

                    sub nested () {
            nestedlabel:
                        addr = &nestedlabel
                        goto nestedlabel
                        goto main.start.nested.nestedlabel
                    }

            labeloutside:
                    addr = &iflabel
                    addr = &labelinside
                    addr = &labeloutside
                    addr = &main.start.nested.nestedlabel
                    ; addr = &nested.nestedlabel      ; TODO should also work!!
                    goto main.start.nested.nestedlabel
                    ; goto nested.nestedlabel     ; TODO should also work!!
                }
            }
        """

        val result = compileText(C64Target, false, src, writeAssembly = true).assertSuccess()
        val module = result.programAst.toplevelModule
        val mainBlock = module.statements.single() as Block
        val start = mainBlock.statements.single() as Subroutine
        val labels = start.statements.filterIsInstance<Label>()
        assertEquals(1, labels.size, "only one label in subroutine scope")

        TODO("fix the partial scoped lookups above as well")
    }

}