package org.shedlang.compiler.config;

import org.shedlang.compiler.backends.Backend;
import org.shedlang.compiler.backends.paths.TargetDir;
import org.shedlang.compiler.config.json.Json5ObjectWithSource;
import org.zwobble.sourcetext.SourceText;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;

public record ProjectConfig(
    Path root,
    List<BinConfig> bins,
    List<DependencyConfig> dependencies,
    List<ProfileConfig> profiles
) {
    public static ProjectConfig read(Path projectPath) throws IOException {
        var configPath = projectPath.resolve("shed.json5");
        var contents = Files.readString(configPath);
        var sourceText = SourceText.fromString(configPath.toString(), contents);
        return fromSourceText(projectPath, sourceText);
    }

    public static ProjectConfig fromSourceText(Path projectPath, SourceText sourceText) {
        return fromJson5(
            projectPath,
            Json5ObjectWithSource.parse(sourceText)
        );
    }

    public static ProjectConfig fromJson5(Path root, Json5ObjectWithSource object) {
        return new ProjectConfig(
            root,
            binsFromJson5(object),
            dependenciesFromJson5(root, object),
            profilesFromJson5(object)
        );
    }

    private static List<BinConfig> binsFromJson5(Json5ObjectWithSource object) {
        return object.getArrayOfObjects("bins")
            .orElseGet(() -> List.of())
            .stream()
            .map(bin -> BinConfig.fromJson5(bin))
            .toList();
    }

    private static List<DependencyConfig> dependenciesFromJson5(
        Path projectRoot,
        Json5ObjectWithSource object
    ) {
        return object.getArrayOfObjects("dependencies")
            .orElseGet(() -> List.of())
            .stream()
            .map(dependency -> DependencyConfig.fromJson5(projectRoot, dependency))
            .toList();
    }

    public static List<ProfileConfig> profilesFromJson5(Json5ObjectWithSource object) {
        return object.getArrayOfObjects("profiles")
            .orElseGet(() -> List.of())
            .stream()
            .map(profile -> ProfileConfig.fromJson5(profile))
            .toList();
    }

    public TargetDir targetDir(Backend backend, ProfileConfig profileConfig) {
        var path = root.resolve("target")
            .resolve(backend.targetName())
            .resolve(profileConfig.name());

        return new TargetDir(path);
    }

    public ProfileConfig profile(String profileName) {
        return this.profiles.stream()
            .filter(profile -> profile.name().equals(profileName))
            .findFirst()
            // TODO: better error
            .orElseThrow();
    }
}