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{-# LANGUAGE NoImplicitPrelude #-}

module Test.Unit.Module (unitTests) where

import Base
import Api qualified
import Checking.Declaration qualified as Declaration
import Checking.Foundation qualified as Foundation
import Checking.Identity qualified as Identity
import Checking.Module qualified as Module
import Checking.Semantic qualified as Semantic
import Felix.Module
import Felix.Migration qualified as Migration
import Felix.Parse qualified as Parse
import Felix.Prelude qualified as Prelude
import Felix.Source
import Felix.Source.Content qualified as Content
import Report.Location
import Provers qualified
import Syntax.Interface qualified as Syntax

import Data.ByteString qualified as ByteString
import Data.Text.Encoding qualified as Text
import Control.Monad.Logger (runNoLoggingT)
import Control.Monad.Reader (runReaderT)
import System.Directory (getCurrentDirectory)
import System.FilePath.Posix qualified as Posix
import Test.Tasty
import Test.Tasty.HUnit


unitTests :: TestTree
unitTests =
    testGroup "Typed module inputs"
        [ testCase "constructs the empty bootstrap ordinarily"
            constructsEmptyBootstrap
        , testCase "identifies comment-only reserved input"
            identifiesCommentOnlyInput
        , testCase "makes selected unsupported syntax terminal"
            rejectsUnsupportedTypedSource
        , testCase "routes production verification by complete graph"
            routesProductionVerification
        ]

constructsEmptyBootstrap :: Assertion
constructsEmptyBootstrap = do
    foundation <- expectRight Foundation.checkedFoundation
    result <-
        Module.buildBootstrapPreludeSession
            foundation
            unusedResolver
    session <- expectRight result
    let input = Module.migrationPreludeInput session
        parsed = Module.identifiedModuleParsed input
        sealed = Module.migrationPreludeModule session
        syntax = Module.sealedTypedModuleSyntax sealed
        semantic = Module.sealedTypedModuleSemantic sealed
    assertEqual "reserved owner"
        preludeModuleName
        (Module.identifiedModuleOwner input)
    case Module.identifiedModuleBinding input of
        Module.ReservedModuleBinding fileId label -> do
            assertEqual "diagnostic label"
                Prelude.preludeDiagnosticLabel
                label
            assertEqual "registered display label"
                (Just Prelude.preludeDiagnosticLabel)
                (lookupFilePath fileId)
            assertEqual "registered identity label"
                (Just Prelude.preludeDiagnosticLabel)
                (lookupFileIdentityPath fileId)
        Module.PhysicalModuleBinding source ->
            assertFailure
                ("bootstrap acquired a physical source: " <> show source)
    assertEqual "empty parsed blocks"
        []
        (Parse.freshParsedModuleBlocks parsed)
    assertEqual "exact empty source identity"
        (Content.sourceContentIdBytes ByteString.empty)
        (Parse.freshParsedModuleSourceContentId parsed)
    assertEqual "no syntax imports"
        []
        (Syntax.moduleSyntaxDirectInputs syntax)
    assertEqual "empty local syntax"
        []
        (Syntax.canonicalSyntaxDeltaEntries
            (Syntax.moduleSyntaxLocalDelta syntax))
    assertEqual "semantic owner"
        preludeModuleName
        (Semantic.semanticInterfaceOwner semantic)
    assertEqual "no semantic imports"
        []
        (Semantic.semanticInterfaceDirectInputs semantic)
    assertEqual "no semantic declarations"
        []
        (Semantic.semanticInterfaceDeclarations semantic)
    expectedPrefix <-
        expectRight
            (Semantic.initialPrefixContextId
                (Identity.theoryId foundation)
                preludeModuleName
                [])
    assertEqual "empty sealed prefix"
        expectedPrefix
        (Declaration.pendingModulePrefixCurrent
            (Module.sealedTypedModulePrefix sealed))

identifiesCommentOnlyInput :: Assertion
identifiesCommentOnlyInput = do
    emptySource <-
        expectRight
            =<< Prelude.parseReservedPreludeSource
                Prelude.emptyBootstrapSourceInput
    source <-
        expectRight
            (Prelude.reservedPreludeSourceInput
                (Text.encodeUtf8 "% an in-memory comment\n"))
    first <-
        expectRight
            =<< Prelude.parseReservedPreludeSource source
    second <-
        expectRight
            =<< Prelude.parseReservedPreludeSource source
    let emptyParsed = Prelude.reservedParsedPreludeModule emptySource
        firstParsed = Prelude.reservedParsedPreludeModule first
        secondParsed = Prelude.reservedParsedPreludeModule second
    assertEqual "comment-only source has no blocks"
        []
        (Parse.freshParsedModuleBlocks firstParsed)
    assertBool "content changes parsed identity"
        (Parse.freshParsedModuleId emptyParsed
            /= Parse.freshParsedModuleId firstParsed)
    assertEqual "same input has stable parsed identity"
        (Parse.freshParsedModuleId firstParsed)
        (Parse.freshParsedModuleId secondParsed)
    assertEqual "comments do not change syntax"
        (Syntax.moduleSyntaxAssertedId
            (Parse.freshParsedModuleSyntaxInterface emptyParsed))
        (Syntax.moduleSyntaxAssertedId
            (Parse.freshParsedModuleSyntaxInterface firstParsed))

rejectsUnsupportedTypedSource :: Assertion
rejectsUnsupportedTypedSource = do
    foundation <- expectRight Foundation.checkedFoundation
    session <-
        expectRight
            =<< Module.buildBootstrapPreludeSession
                foundation
                unusedResolver
    root <- getCurrentDirectory
    mounts <-
        expectRight
            =<< prepareSourceMounts
                [ (sourceMountId "project", root)
                , (sourceMountId "library", root Posix.</> "library")
                , (sourceMountId "debug", root Posix.</> "debug")
                ]
    selection <-
        expectRight
            (Migration.resolveMigrationSelection
                mounts
                Migration.typedMigrationModules)
    let bootstrapSyntax =
            Module.sealedTypedModuleSyntax
                (Module.migrationPreludeModule session)
        syntaxInputs source
            | Migration.migrationSelectionContains selection source =
                [bootstrapSyntax]
            | otherwise = []
    request <-
        expectRight
            (searchedRoot "test/phase3/typed-unsupported.tex")
    (workspace, _measurements) <-
        expectRight
            =<< Parse.parseSourceWorkspaceMeasuredWithSyntaxInputs
                mounts
                request
                syntaxInputs
    assertEqual "selected graph classification"
        Migration.TypedMigrationGraph
        (Migration.classifyMigrationGraph selection workspace)
    let parsed = Parse.parsedWorkspaceRootModule workspace
    input <-
        expectRight
            (Module.typedModuleInput
                foundation
                session
                unusedResolver
                parsed
                [])
    Module.runTypedModule input >>= \case
        Module.TypedModuleFailed
                (Module.TypedActionFailed
                    (Module.TypedUnsupportedBlock location))
                prefix -> do
            assertEqual "unsupported block location line"
                1
                (locLine location)
            assertEqual "failure retains the initial module prefix"
                0
                (length
                    (Declaration.pendingModulePrefixBatches prefix))
        Module.TypedModuleOpenFailed err ->
            assertFailure ("typed module did not open: " <> show err)
        Module.TypedModuleFailed err _prefix ->
            assertFailure ("unexpected typed failure: " <> show err)
        Module.TypedModuleSucceeded{} ->
            assertFailure "unsupported typed source was admitted"

routesProductionVerification :: Assertion
routesProductionVerification = do
    producer <- verifyFixture "test/phase3/typed-producer.tex"
    assertRoute "selected producer"
        Api.TypedVerificationRoute
        producer
    importer <- verifyFixture "test/phase3/legacy-importer.tex"
    assertRoute "unselected importer"
        Api.LegacyVerificationRoute
        importer
  where
    verifyFixture path =
        runNoLoggingT
            (runReaderT
                (fst
                    <$> Api.verifyMeasured
                        (Provers.vampire
                            "vampire"
                            Provers.defaultTimeLimit
                            Provers.defaultMemoryLimit)
                        path)
                testOptions)

    assertRoute label expected = \case
        Api.VerifiedWithTrustedVampire report ->
            assertEqual label expected (Api.verificationRoute report)
        Api.CompletedWithExplicitGaps report ->
            assertFailure
                (label <> " completed with gaps via "
                    <> show (Api.verificationRoute report))
        Api.VerificationFailure failure ->
            assertFailure (label <> " failed: " <> show failure)

testOptions :: Api.Options
testOptions = Api.Options
    { Api.inputPath = ""
    , Api.withDump = Api.WithoutDump
    , Api.withFilter = Api.WithoutFilter
    , Api.withLogging = Api.WithoutLogging
    , Api.withMemoryLimit = Provers.defaultMemoryLimit
    , Api.withOmissions = Api.WithOmissions
    , Api.withParseOnly = Api.WithoutParseOnly
    , Api.withTimeLimit = Provers.defaultTimeLimit
    , Api.withVersion = Api.WithoutVersion
    , Api.withHtml = Api.WithoutHtml
    , Api.withDumpPremselTraining = Api.WithoutDumpPremselTraining
    }

unusedResolver :: Declaration.VampireResolver
unusedResolver =
    Declaration.vampireResolver \_prepared ->
        fail "empty bootstrap invoked Vampire"

expectRight :: Show error => Either error value -> IO value
expectRight = \case
    Left err -> assertFailure (show err) >> fail "unreachable"
    Right value -> pure value