package dev.projectcapture.buildlogic;

import org.gradle.api.DefaultTask;
import org.gradle.api.GradleException;
import org.gradle.api.file.DirectoryProperty;
import org.gradle.api.tasks.Internal;
import org.gradle.api.tasks.TaskAction;

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

public abstract class VerifyFanProjectPolicy extends DefaultTask {
    @Internal
    public abstract DirectoryProperty getProjectRoot();

    @TaskAction
    public void verify() throws IOException {
        File root = getProjectRoot().get().getAsFile();
        List<String> requiredFiles = List.of(
            "LICENSE",
            "THIRD_PARTY_NOTICE.md",
            "fan-project-metadata.json",
            "docs/UNOFFICIAL_FAN_PROJECT_POLICY.md"
        );
        List<String> missing = requiredFiles.stream()
            .filter(path -> !root.toPath().resolve(path).toFile().isFile())
            .toList();
        if (!missing.isEmpty()) {
            throw new GradleException("Missing fan-project safeguards: " + String.join(", ", missing));
        }

        String metadata = Files.readString(root.toPath().resolve("fan-project-metadata.json"));
        List<String> requiredFlags = List.of(
            "\"unofficial\": true",
            "\"nonCommercial\": true",
            "\"containsPokemonFanContent\": true",
            "\"bundlesHytaleGameFiles\": false"
        );
        List<String> absentFlags = requiredFlags.stream()
            .filter(flag -> !metadata.contains(flag))
            .toList();
        if (!absentFlags.isEmpty()) {
            throw new GradleException("Invalid fan-project metadata; missing: " + String.join(", ", absentFlags));
        }
    }
}