package prog8tests

import com.github.michaelbull.result.getErrorOrElse
import com.github.michaelbull.result.getOrElse
import prog8.ast.Program
import prog8.ast.internedStringsModuleName
import prog8.compiler.ModuleImporter
import prog8.compilerinterface.IErrorReporter
import prog8.parser.ParseError
import prog8.parser.SourceCode
import kotlin.io.path.*
import io.kotest.assertions.fail
import io.kotest.assertions.throwables.shouldThrow
import io.kotest.assertions.withClue
import io.kotest.core.spec.style.FunSpec
import io.kotest.matchers.collections.shouldBeIn
import io.kotest.matchers.shouldBe
import io.kotest.matchers.string.shouldContain
import prog8tests.helpers.*
import prog8tests.helpers.DummyFunctions
import prog8tests.helpers.DummyMemsizer
import prog8tests.helpers.DummyStringEncoder
import prog8tests.helpers.ErrorReporterForTests


class TestModuleImporter: FunSpec({
    val count = listOf("1st", "2nd", "3rd", "4th", "5th")

    lateinit var program: Program

    beforeTest {
        program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
    }

    fun makeImporter(errors: IErrorReporter? = null, searchIn: Iterable<String>) =
        ModuleImporter(program, "blah", errors ?: ErrorReporterForTests(false), searchIn.toList())

    fun makeImporter(errors: IErrorReporter?, vararg searchIn: String): ModuleImporter {
        return makeImporter(errors, searchIn.asList())
    }

    context("ImportModule") {

        context("WithInvalidPath") {
            test("testNonexisting") {
                val dirRel = assumeDirectory(".", workingDir.relativize(fixturesDir))
                val importer = makeImporter(null, dirRel.invariantSeparatorsPathString)
                val srcPathRel = assumeNotExists(dirRel, "i_do_not_exist")
                val srcPathAbs = srcPathRel.absolute()
                val error1 = importer.importModule(srcPathRel).getErrorOrElse { fail("should have import error") }
                withClue(".file should be normalized") {
                    "${error1.file}" shouldBe "${error1.file.normalize()}"
                }
                withClue(".file should point to specified path") {
                    error1.file.absolutePath shouldBe "${srcPathAbs.normalize()}"
                }
                program.modules.size shouldBe 1

                val error2 = importer.importModule(srcPathAbs).getErrorOrElse { fail("should have import error") }
                withClue(".file should be normalized") {
                    "${error2.file}" shouldBe "${error2.file.normalize()}"
                }
                withClue(".file should point to specified path") {
                    error2.file.absolutePath shouldBe "${srcPathAbs.normalize()}"
                }
                program.modules.size shouldBe 1
            }

            test("testDirectory") {
                val srcPathRel = assumeDirectory(workingDir.relativize(fixturesDir))
                val srcPathAbs = srcPathRel.absolute()
                val searchIn = Path(".", "$srcPathRel").invariantSeparatorsPathString
                val importer = makeImporter(null, searchIn)

                shouldThrow<AccessDeniedException> { importer.importModule(srcPathRel) }
                    .let {
                        withClue(".file should be normalized") {
                            "${it.file}" shouldBe "${it.file.normalize()}"
                        }
                        withClue(".file should point to specified path") {
                            it.file.absolutePath shouldBe "${srcPathAbs.normalize()}"
                        }
                    }
                program.modules.size shouldBe 1

                shouldThrow<AccessDeniedException> { importer.importModule(srcPathAbs) }
                    .let {
                        withClue(".file should be normalized") {
                            "${it.file}" shouldBe "${it.file.normalize()}"
                        }
                        withClue(".file should point to specified path") {
                            it.file.absolutePath shouldBe "${srcPathAbs.normalize()}"
                        }
                    }
                program.modules.size shouldBe 1
            }
        }

        context("WithValidPath") {

            test("testAbsolute") {
                val searchIn = listOf(
                    Path(".").div(workingDir.relativize(fixturesDir)), // we do want a dot "." in front
                ).map { it.invariantSeparatorsPathString }
                val importer = makeImporter(null, searchIn)
                val fileName = "ast_simple_main.p8"
                val path = assumeReadableFile(searchIn[0], fileName)

                val module = importer.importModule(path.absolute()).getOrElse { throw it }
                program.modules.size shouldBe 2
                module shouldBeIn program.modules
                module.program shouldBe program
            }

            test("testRelativeToWorkingDir") {
                val searchIn = listOf(
                    Path(".").div(workingDir.relativize(fixturesDir)), // we do want a dot "." in front
                ).map { it.invariantSeparatorsPathString }
                val importer = makeImporter(null, searchIn)
                val fileName = "ast_simple_main.p8"
                val path = assumeReadableFile(searchIn[0], fileName)
                withClue("sanity check: path should NOT be absolute") {
                    path.isAbsolute shouldBe false
                }

                val module = importer.importModule(path).getOrElse { throw it }
                program.modules.size shouldBe 2
                module shouldBeIn program.modules
                module.program shouldBe program
            }

            test("testRelativeTo1stDirInSearchList") {
                val searchIn = Path(".")
                    .div(workingDir.relativize(fixturesDir))
                    .invariantSeparatorsPathString
                val importer = makeImporter(null, searchIn)
                val fileName = "ast_simple_main.p8"
                val path = Path(".", fileName)
                assumeReadableFile(searchIn, path)

                val module = importer.importModule(path).getOrElse { throw it }
                program.modules.size shouldBe 2
                module shouldBeIn program.modules
                module.program shouldBe program
            }

            context("WithBadFile") {
                test("testWithSyntaxError") {
                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
                    val srcPath = assumeReadableFile(fixturesDir, "ast_file_with_syntax_error.p8")

                    val act = { importer.importModule(srcPath) }

                    repeat(2) { n -> withClue(count[n] + " call") {
                            shouldThrow<ParseError>() { act() }.let {
                                it.position.file shouldBe SourceCode.relative(srcPath).toString()
                                withClue("line; should be 1-based") { it.position.line shouldBe 2 }
                                withClue("startCol; should be 0-based") { it.position.startCol shouldBe 6 }
                                withClue("endCol; should be 0-based") { it.position.endCol shouldBe 6 }
                            }
                        }
                        program.modules.size shouldBe 1
                    }
                }

                fun doTestImportingFileWithSyntaxError(repetitions: Int) {
                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
                    val importing = assumeReadableFile(fixturesDir, "import_file_with_syntax_error.p8")
                    val imported = assumeReadableFile(fixturesDir, "file_with_syntax_error.p8")

                    val act = { importer.importModule(importing) }

                    repeat(repetitions) { n -> withClue(count[n] + " call") {
                        shouldThrow<ParseError> { act() }.let {
                            it.position.file shouldBe SourceCode.relative(imported).toString()
                            withClue("line; should be 1-based") { it.position.line shouldBe 2 }
                            withClue("startCol; should be 0-based") { it.position.startCol shouldBe 6 }
                            withClue("endCol; should be 0-based") { it.position.endCol shouldBe 6 }
                        }
                    }
                    withClue("imported module with error in it should not be present") { program.modules.size shouldBe 1 }
                        program.modules[0].name shouldBe internedStringsModuleName
                    }
                }

                test("testImportingFileWithSyntaxError_once") {
                    doTestImportingFileWithSyntaxError(1)
                }

                test("testImportingFileWithSyntaxError_twice") {
                    doTestImportingFileWithSyntaxError(2)
                }
            }
        }
    }

    context("ImportLibraryModule") {
        context("WithInvalidName") {
            test("testWithNonExistingName") {
                val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                val errors = ErrorReporterForTests(false)
                val importer = makeImporter(errors, searchIn.invariantSeparatorsPathString)
                val filenameNoExt = assumeNotExists(fixturesDir, "i_do_not_exist").name
                val filenameWithExt = assumeNotExists(fixturesDir, "i_do_not_exist.p8").name

                repeat(2) { n ->
                    val result = importer.importLibraryModule(filenameNoExt)
                    withClue(count[n] + " call / NO .p8 extension") { result shouldBe null }
                    withClue(count[n] + " call / NO .p8 extension") { errors.noErrors() shouldBe false }
                    errors.errors.single() shouldContain "0:0) no module found with name i_do_not_exist"
                    errors.report()
                    program.modules.size shouldBe 1

                    val result2 = importer.importLibraryModule(filenameWithExt)
                    withClue(count[n] + " call / with .p8 extension") { result2 shouldBe null }
                    withClue(count[n] + " call / with .p8 extension") { importer.errors.noErrors() shouldBe false }
                    errors.errors.single() shouldContain "0:0) no module found with name i_do_not_exist.p8"
                    errors.report()
                    program.modules.size shouldBe 1
                }
            }
        }

        context("WithValidName") {
            context("WithBadFile") {
                test("testWithSyntaxError") {
                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
                    val srcPath = assumeReadableFile(fixturesDir, "ast_file_with_syntax_error.p8")

                    repeat(2) { n -> withClue(count[n] + " call") {
                            shouldThrow<ParseError>()
                            {
                                importer.importLibraryModule(srcPath.nameWithoutExtension) }.let {
                                it.position.file shouldBe SourceCode.relative(srcPath).toString()
                                withClue("line; should be 1-based") { it.position.line shouldBe 2 }
                                withClue("startCol; should be 0-based") { it.position.startCol shouldBe 6 }
                                withClue("endCol; should be 0-based") { it.position.endCol shouldBe 6 }
                            }
                        }
                        program.modules.size shouldBe 1
                    }
                }


                fun doTestImportingFileWithSyntaxError(repetitions: Int) {
                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
                    val importing = assumeReadableFile(fixturesDir, "import_file_with_syntax_error.p8")
                    val imported = assumeReadableFile(fixturesDir, "file_with_syntax_error.p8")

                    val act = { importer.importLibraryModule(importing.nameWithoutExtension) }

                    repeat(repetitions) { n -> withClue(count[n] + " call") {
                            shouldThrow<ParseError>() {
                                act() }.let {
                                it.position.file shouldBe SourceCode.relative(imported).toString()
                                withClue("line; should be 1-based") { it.position.line shouldBe 2 }
                                withClue("startCol; should be 0-based") { it.position.startCol shouldBe 6 }
                                withClue("endCol; should be 0-based") { it.position.endCol shouldBe 6 }
                            }
                        }
                        withClue("imported module with error in it should not be present") { program.modules.size shouldBe 1 }
                        program.modules[0].name shouldBe internedStringsModuleName
                        importer.errors.report()
                    }
                }

                test("testImportingFileWithSyntaxError_once") {
                    doTestImportingFileWithSyntaxError(1)
                }

                test("testImportingFileWithSyntaxError_twice") {
                    doTestImportingFileWithSyntaxError(2)
                }
            }
        }
    }
})