{-# LANGUAGE BlockArguments #-}

module ResultFunctionsTest (tests) where

import Control.Monad (forM_, when)
import Database.DuckDB.FFI
import Foreign.C.String (withCString)
import Foreign.C.Types (CBool (..))
import Foreign.Marshal.Alloc (alloca)
import Foreign.Ptr (nullPtr)
import Test.Tasty (TestTree, testGroup)
import Test.Tasty.HUnit (assertBool, testCase, (@?=))
import Utils (withConnection, withDatabase)

tests :: TestTree
tests =
    testGroup
        "Result Functions"
        [ chunkIntrospection
        ]

chunkIntrospection :: TestTree
chunkIntrospection =
    testCase "result chunk information and streaming state" $
        withDatabase \db ->
            withConnection db \conn -> do
                let createSQL = "CREATE TABLE items(id INTEGER);"
                    insertSQL =
                        "INSERT INTO items VALUES (1), (2), (3), (4), (5);"
                forM_ [createSQL, insertSQL] \sql ->
                    withCString sql \cSql ->
                        alloca \resPtr -> do
                            st <- c_duckdb_query conn cSql resPtr
                            st @?= DuckDBSuccess
                            c_duckdb_destroy_result resPtr

                withCString "SELECT * FROM items" \selectSQL ->
                    alloca \resPtr -> do
                        st <- c_duckdb_query conn selectSQL resPtr
                        st @?= DuckDBSuccess

                        chunkCount <- c_duckdb_result_chunk_count resPtr
                        assertBool "chunk count should be positive" (chunkCount > 0)

                        returnType <- c_duckdb_result_return_type resPtr
                        returnType @?= DuckDBResultTypeQueryResult

                        streamingFlag <- c_duckdb_result_is_streaming resPtr
                        streamingFlag @?= CBool 0

                        -- Retrieve first chunk if available
                        when (chunkCount > 0) $ do
                            chunk0 <- c_duckdb_result_get_chunk resPtr 0
                            assertBool "first chunk should not be null" (chunk0 /= nullPtr)
                            -- Requesting beyond the available chunk count should return null
                            chunkInvalid <- c_duckdb_result_get_chunk resPtr chunkCount
                            assertBool "out-of-range chunk should be null" (chunkInvalid == nullPtr)

                        c_duckdb_destroy_result resPtr