package org.javacs.kt

import com.google.gson.GsonBuilder
import com.google.gson.JsonDeserializationContext
import com.google.gson.JsonDeserializer
import com.google.gson.JsonElement
import com.google.gson.JsonParseException
import org.eclipse.lsp4j.InitializeParams
import org.eclipse.lsp4j.DiagnosticSeverity
import java.lang.reflect.Type
import java.nio.file.InvalidPathException
import java.nio.file.Path
import java.nio.file.Paths

public data class SnippetsConfiguration(
    /** Whether code completion should return VSCode-style snippets. */
    var enabled: Boolean = true
)

public data class CompletionConfiguration(
    val snippets: SnippetsConfiguration = SnippetsConfiguration()
)

public data class DiagnosticsConfiguration(
    /** Whether diagnostics are enabled. */
    var enabled: Boolean = true,
    /** The minimum severity of enabled diagnostics. */
    var level: DiagnosticSeverity = DiagnosticSeverity.Hint,
    /** The time interval between subsequent lints in ms. */
    var debounceTime: Long = 250L
)

public data class JVMConfiguration(
    /** Which JVM target the Kotlin compiler uses. See Compiler.jvmTargetFrom for possible values. */
    var target: String = "default"
)

public data class CompilerConfiguration(
    val jvm: JVMConfiguration = JVMConfiguration()
)

public data class IndexingConfiguration(
    /** Whether an index of global symbols should be built in the background. */
    var enabled: Boolean = true
)

public data class ExternalSourcesConfiguration(
    /** Whether kls-URIs should be sent to the client to describe classes in JARs. */
    var useKlsScheme: Boolean = false,
    /** Whether external classes should be automatically converted to Kotlin. */
    var autoConvertToKotlin: Boolean = false
)

data class InlayHintsConfiguration(
    var typeHints: Boolean = false,
    var parameterHints: Boolean = false,
    var chainedHints: Boolean = false
)

data class KtfmtConfiguration(
    var style: String = "google",
    var indent: Int = 4,
    var maxWidth: Int = 100,
    var continuationIndent: Int = 8,
    var removeUnusedImports: Boolean = true,
)

data class FormattingConfiguration(
    var formatter: String = "ktfmt",
    var ktfmt: KtfmtConfiguration = KtfmtConfiguration()
)

fun getStoragePath(params: InitializeParams): Path? {
    params.initializationOptions?.let { initializationOptions ->
        val gson = GsonBuilder().registerTypeHierarchyAdapter(Path::class.java, GsonPathConverter()).create()
        val options = gson.fromJson(initializationOptions as JsonElement, InitializationOptions::class.java)

        return options?.storagePath
    }

    return null
}

data class InitializationOptions(
    // A path to a directory used by the language server to store data. Used for caching purposes.
    val storagePath: Path?
)

class GsonPathConverter : JsonDeserializer<Path?> {

    @Throws(JsonParseException::class)
    override fun deserialize(json: JsonElement, type: Type?, context: JsonDeserializationContext?): Path? {
        return try {
            Paths.get(json.asString)
        } catch (ex: InvalidPathException) {
            LOG.printStackTrace(ex)
            null
        }
    }
}

public data class Configuration(
    val compiler: CompilerConfiguration = CompilerConfiguration(),
    val completion: CompletionConfiguration = CompletionConfiguration(),
    val diagnostics: DiagnosticsConfiguration = DiagnosticsConfiguration(),
    val scripts: ScriptsConfiguration = ScriptsConfiguration(),
    val indexing: IndexingConfiguration = IndexingConfiguration(),
    val externalSources: ExternalSourcesConfiguration = ExternalSourcesConfiguration(),
    val inlayHints: InlayHintsConfiguration = InlayHintsConfiguration(),
    val formatting: FormattingConfiguration = FormattingConfiguration(),
)