package com.termux.shared.termux;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;

import androidx.annotation.NonNull;

import com.termux.shared.R;
import com.termux.shared.logger.Logger;
import com.termux.shared.markdown.MarkdownUtils;
import com.termux.shared.models.ExecutionCommand;
import com.termux.shared.packages.PackageUtils;
import com.termux.shared.shell.TermuxShellEnvironmentClient;
import com.termux.shared.shell.TermuxTask;

import org.apache.commons.io.IOUtils;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.List;
import java.util.regex.Pattern;

public class TermuxUtils {

    private static final String LOG_TAG = "TermuxUtils";

    /**
     * Get the {@link Context} for {@link TermuxConstants#TERMUX_PACKAGE_NAME} package.
     *
     * @param context The {@link Context} to use to get the {@link Context} of the package.
     * @return Returns the {@link Context}. This will {@code null} if an exception is raised.
     */
    public static Context getTermuxPackageContext(@NonNull Context context) {
        return PackageUtils.getContextForPackage(context, TermuxConstants.TERMUX_PACKAGE_NAME);
    }

    /**
     * Get the {@link Context} for {@link TermuxConstants#TERMUX_API_PACKAGE_NAME} package.
     *
     * @param context The {@link Context} to use to get the {@link Context} of the package.
     * @return Returns the {@link Context}. This will {@code null} if an exception is raised.
     */
    public static Context getTermuxAPIPackageContext(@NonNull Context context) {
        return PackageUtils.getContextForPackage(context, TermuxConstants.TERMUX_API_PACKAGE_NAME);
    }

    /**
     * Get the {@link Context} for {@link TermuxConstants#TERMUX_BOOT_PACKAGE_NAME} package.
     *
     * @param context The {@link Context} to use to get the {@link Context} of the package.
     * @return Returns the {@link Context}. This will {@code null} if an exception is raised.
     */
    public static Context getTermuxBootPackageContext(@NonNull Context context) {
        return PackageUtils.getContextForPackage(context, TermuxConstants.TERMUX_BOOT_PACKAGE_NAME);
    }

    /**
     * Get the {@link Context} for {@link TermuxConstants#TERMUX_FLOAT_PACKAGE_NAME} package.
     *
     * @param context The {@link Context} to use to get the {@link Context} of the package.
     * @return Returns the {@link Context}. This will {@code null} if an exception is raised.
     */
    public static Context getTermuxFloatPackageContext(@NonNull Context context) {
        return PackageUtils.getContextForPackage(context, TermuxConstants.TERMUX_FLOAT_PACKAGE_NAME);
    }

    /**
     * Get the {@link Context} for {@link TermuxConstants#TERMUX_STYLING_PACKAGE_NAME} package.
     *
     * @param context The {@link Context} to use to get the {@link Context} of the package.
     * @return Returns the {@link Context}. This will {@code null} if an exception is raised.
     */
    public static Context getTermuxStylingPackageContext(@NonNull Context context) {
        return PackageUtils.getContextForPackage(context, TermuxConstants.TERMUX_STYLING_PACKAGE_NAME);
    }

    /**
     * Get the {@link Context} for {@link TermuxConstants#TERMUX_TASKER_PACKAGE_NAME} package.
     *
     * @param context The {@link Context} to use to get the {@link Context} of the package.
     * @return Returns the {@link Context}. This will {@code null} if an exception is raised.
     */
    public static Context getTermuxTaskerPackageContext(@NonNull Context context) {
        return PackageUtils.getContextForPackage(context, TermuxConstants.TERMUX_TASKER_PACKAGE_NAME);
    }

    /**
     * Get the {@link Context} for {@link TermuxConstants#TERMUX_WIDGET_PACKAGE_NAME} package.
     *
     * @param context The {@link Context} to use to get the {@link Context} of the package.
     * @return Returns the {@link Context}. This will {@code null} if an exception is raised.
     */
    public static Context getTermuxWidgetPackageContext(@NonNull Context context) {
        return PackageUtils.getContextForPackage(context, TermuxConstants.TERMUX_WIDGET_PACKAGE_NAME);
    }



    /**
     * Send the {@link TermuxConstants#BROADCAST_TERMUX_OPENED} broadcast to notify apps that Termux
     * app has been opened.
     *
     * @param context The Context to send the broadcast.
     */
    public static void sendTermuxOpenedBroadcast(@NonNull Context context) {
        Intent broadcast = new Intent(TermuxConstants.BROADCAST_TERMUX_OPENED);
        List<ResolveInfo> matches = context.getPackageManager().queryBroadcastReceivers(broadcast, 0);

        // send broadcast to registered Termux receivers
        // this technique is needed to work around broadcast changes that Oreo introduced
        for (ResolveInfo info : matches) {
            Intent explicitBroadcast = new Intent(broadcast);
            ComponentName cname = new ComponentName(info.activityInfo.applicationInfo.packageName,
                info.activityInfo.name);
            explicitBroadcast.setComponent(cname);
            context.sendBroadcast(explicitBroadcast);
        }
    }

    /**
     * Get a markdown {@link String} for the apps info of all/any termux plugin apps installed.
     *
     * @param currentPackageContext The context of current package.
     * @return Returns the markdown {@link String}.
     */
    public static String getTermuxPluginAppsInfoMarkdownString(final Context currentPackageContext) {
        if (currentPackageContext == null) return "null";

        StringBuilder markdownString = new StringBuilder();

        List<String> termuxPluginAppPackageNamesList = TermuxConstants.TERMUX_PLUGIN_APP_PACKAGE_NAMES_LIST;

        if (termuxPluginAppPackageNamesList != null) {
            for (int i = 0; i < termuxPluginAppPackageNamesList.size(); i++) {
                String termuxPluginAppPackageName = termuxPluginAppPackageNamesList.get(i);
                Context termuxPluginAppContext = PackageUtils.getContextForPackage(currentPackageContext, termuxPluginAppPackageName);
                // If the package context for the plugin app is not null, then assume its installed and get its info
                if (termuxPluginAppContext != null) {
                    if (i != 0)
                        markdownString.append("\n\n");
                    markdownString.append(getAppInfoMarkdownString(termuxPluginAppContext, false));
                }
            }
        }

        if (markdownString.toString().isEmpty())
            return null;

        return markdownString.toString();
    }

    /**
     * Get a markdown {@link String} for the app info. If the {@code context} passed is different
     * from the {@link TermuxConstants#TERMUX_PACKAGE_NAME} package context, then this function
     * must have been called by a different package like a plugin, so we return info for both packages
     * if {@code returnTermuxPackageInfoToo} is {@code true}.
     *
     * @param currentPackageContext The context of current package.
     * @param returnTermuxPackageInfoToo If set to {@code true}, then will return info of the
     * {@link TermuxConstants#TERMUX_PACKAGE_NAME} package as well if its different from current package.
     * @return Returns the markdown {@link String}.
     */
    public static String getAppInfoMarkdownString(final Context currentPackageContext, final boolean returnTermuxPackageInfoToo) {
        if (currentPackageContext == null) return "null";

        StringBuilder markdownString = new StringBuilder();

        Context termuxPackageContext = getTermuxPackageContext(currentPackageContext);

        String termuxPackageName = null;
        String termuxAppName = null;
        if (termuxPackageContext != null) {
            termuxPackageName = PackageUtils.getPackageNameForPackage(termuxPackageContext);
            termuxAppName = PackageUtils.getAppNameForPackage(termuxPackageContext);
        }

        String currentPackageName = PackageUtils.getPackageNameForPackage(currentPackageContext);
        String currentAppName = PackageUtils.getAppNameForPackage(currentPackageContext);

        boolean isTermuxPackage = (termuxPackageName != null && termuxPackageName.equals(currentPackageName));


        if (returnTermuxPackageInfoToo && !isTermuxPackage)
            markdownString.append("## ").append(currentAppName).append(" App Info (Current)\n");
        else
            markdownString.append("## ").append(currentAppName).append(" App Info\n");
        markdownString.append(getAppInfoMarkdownStringInner(currentPackageContext));

        if (returnTermuxPackageInfoToo && termuxPackageContext != null && !isTermuxPackage) {
            markdownString.append("\n\n## ").append(termuxAppName).append(" App Info\n");
            markdownString.append(getAppInfoMarkdownStringInner(termuxPackageContext));
        }

        markdownString.append("\n##\n");

        return markdownString.toString();
    }

    /**
     * Get a markdown {@link String} for the app info for the package associated with the {@code context}.
     *
     * @param context The context for operations for the package.
     * @return Returns the markdown {@link String}.
     */
    public static String getAppInfoMarkdownStringInner(@NonNull final Context context) {
        StringBuilder markdownString = new StringBuilder();

        markdownString.append((AndroidUtils.getAppInfoMarkdownString(context)));

        String signingCertificateSHA256Digest = PackageUtils.getSigningCertificateSHA256DigestForPackage(context);
        if (signingCertificateSHA256Digest != null) {
            AndroidUtils.appendPropertyToMarkdown(markdownString,"APK_RELEASE", getAPKRelease(signingCertificateSHA256Digest));
            AndroidUtils.appendPropertyToMarkdown(markdownString,"SIGNING_CERTIFICATE_SHA256_DIGEST", signingCertificateSHA256Digest);
        }

        return markdownString.toString();
    }

    /**
     * Get a markdown {@link String} for reporting an issue.
     *
     * @param context The context for operations.
     * @return Returns the markdown {@link String}.
     */
    public static String getReportIssueMarkdownString(@NonNull final Context context) {
        if (context == null) return "null";

        StringBuilder markdownString = new StringBuilder();

        markdownString.append("## Where To Report An Issue");

        markdownString.append("\n\n").append(context.getString(R.string.msg_report_issue)).append("\n");

        markdownString.append("\n\n### Email\n");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_SUPPORT_EMAIL_URL, TermuxConstants.TERMUX_SUPPORT_EMAIL_MAILTO_URL)).append("  ");

        markdownString.append("\n\n### Reddit\n");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_REDDIT_SUBREDDIT, TermuxConstants.TERMUX_REDDIT_SUBREDDIT_URL)).append("  ");

        markdownString.append("\n\n### Github Issues for Termux apps\n");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_APP_NAME, TermuxConstants.TERMUX_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_API_APP_NAME, TermuxConstants.TERMUX_API_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_BOOT_APP_NAME, TermuxConstants.TERMUX_BOOT_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_FLOAT_APP_NAME, TermuxConstants.TERMUX_FLOAT_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_STYLING_APP_NAME, TermuxConstants.TERMUX_STYLING_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_TASKER_APP_NAME, TermuxConstants.TERMUX_TASKER_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_WIDGET_APP_NAME, TermuxConstants.TERMUX_WIDGET_GITHUB_ISSUES_REPO_URL)).append("  ");

        markdownString.append("\n\n### Github Issues for Termux packages\n");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_PACKAGES_GITHUB_REPO_NAME, TermuxConstants.TERMUX_PACKAGES_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_GAME_PACKAGES_GITHUB_REPO_NAME, TermuxConstants.TERMUX_GAME_PACKAGES_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_SCIENCE_PACKAGES_GITHUB_REPO_NAME, TermuxConstants.TERMUX_SCIENCE_PACKAGES_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_ROOT_PACKAGES_GITHUB_REPO_NAME, TermuxConstants.TERMUX_ROOT_PACKAGES_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_UNSTABLE_PACKAGES_GITHUB_REPO_NAME, TermuxConstants.TERMUX_UNSTABLE_PACKAGES_GITHUB_ISSUES_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_X11_PACKAGES_GITHUB_REPO_NAME, TermuxConstants.TERMUX_X11_PACKAGES_GITHUB_ISSUES_REPO_URL)).append("  ");

        markdownString.append("\n##\n");

        return markdownString.toString();
    }

    /**
     * Get a markdown {@link String} for important links.
     *
     * @param context The context for operations.
     * @return Returns the markdown {@link String}.
     */
    public static String getImportantLinksMarkdownString(@NonNull final Context context) {
        if (context == null) return "null";

        StringBuilder markdownString = new StringBuilder();

        markdownString.append("## Important Links");

        markdownString.append("\n\n### Github\n");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_APP_NAME, TermuxConstants.TERMUX_GITHUB_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_API_APP_NAME, TermuxConstants.TERMUX_API_GITHUB_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_BOOT_APP_NAME, TermuxConstants.TERMUX_BOOT_GITHUB_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_FLOAT_APP_NAME, TermuxConstants.TERMUX_FLOAT_GITHUB_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_STYLING_APP_NAME, TermuxConstants.TERMUX_STYLING_GITHUB_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_TASKER_APP_NAME, TermuxConstants.TERMUX_TASKER_GITHUB_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_WIDGET_APP_NAME, TermuxConstants.TERMUX_WIDGET_GITHUB_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_PACKAGES_GITHUB_REPO_NAME, TermuxConstants.TERMUX_PACKAGES_GITHUB_REPO_URL)).append("  ");

        markdownString.append("\n\n### Email\n");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_SUPPORT_EMAIL_URL, TermuxConstants.TERMUX_SUPPORT_EMAIL_MAILTO_URL)).append("  ");

        markdownString.append("\n\n### Reddit\n");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_REDDIT_SUBREDDIT, TermuxConstants.TERMUX_REDDIT_SUBREDDIT_URL)).append("  ");

        markdownString.append("\n\n### Wiki\n");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_WIKI, TermuxConstants.TERMUX_WIKI_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_APP_NAME, TermuxConstants.TERMUX_GITHUB_WIKI_REPO_URL)).append("  ");
        markdownString.append("\n").append(MarkdownUtils.getLinkMarkdownString(TermuxConstants.TERMUX_PACKAGES_GITHUB_REPO_NAME, TermuxConstants.TERMUX_PACKAGES_GITHUB_WIKI_REPO_URL)).append("  ");

        markdownString.append("\n##\n");

        return markdownString.toString();
    }



    /**
     * Get a markdown {@link String} for APT info of the app.
     *
     * This will take a few seconds to run due to running {@code apt update} command.
     *
     * @param context The context for operations.
     * @return Returns the markdown {@link String}.
     */
    public static String geAPTInfoMarkdownString(@NonNull final Context context) {

        String aptInfoScript;
        InputStream inputStream = context.getResources().openRawResource(com.termux.shared.R.raw.apt_info_script);
        try {
            aptInfoScript = IOUtils.toString(inputStream, Charset.defaultCharset());
        } catch (IOException e) {
            Logger.logError(LOG_TAG, "Failed to get APT info script: " + e.getMessage());
            return null;
        }

        IOUtils.closeQuietly(inputStream);

        if (aptInfoScript == null || aptInfoScript.isEmpty()) {
            Logger.logError(LOG_TAG, "The APT info script is null or empty");
            return null;
        }

        aptInfoScript = aptInfoScript.replaceAll(Pattern.quote("@TERMUX_PREFIX@"), TermuxConstants.TERMUX_PREFIX_DIR_PATH);

        ExecutionCommand executionCommand = new ExecutionCommand(1, TermuxConstants.TERMUX_BIN_PREFIX_DIR_PATH + "/bash", null, aptInfoScript, null, true, false);
        TermuxTask termuxTask = TermuxTask.execute(context, executionCommand, null, new TermuxShellEnvironmentClient(), true);
        if (termuxTask == null || !executionCommand.isSuccessful() || executionCommand.resultData.exitCode != 0) {
            Logger.logError(LOG_TAG, executionCommand.toString());
            return null;
        }

        if (!executionCommand.resultData.stderr.toString().isEmpty())
            Logger.logError(LOG_TAG, executionCommand.toString());

        StringBuilder markdownString = new StringBuilder();

        markdownString.append("## ").append(TermuxConstants.TERMUX_APP_NAME).append(" APT Info\n\n");
        markdownString.append(executionCommand.resultData.stdout.toString());

        return markdownString.toString();
    }


    public static String getAPKRelease(String signingCertificateSHA256Digest) {
        if (signingCertificateSHA256Digest == null) return "null";

        switch (signingCertificateSHA256Digest.toUpperCase()) {
            case TermuxConstants.APK_RELEASE_FDROID_SIGNING_CERTIFICATE_SHA256_DIGEST:
                return TermuxConstants.APK_RELEASE_FDROID;
            case TermuxConstants.APK_RELEASE_GITHUB_DEBUG_BUILD_SIGNING_CERTIFICATE_SHA256_DIGEST:
                return TermuxConstants.APK_RELEASE_GITHUB_DEBUG_BUILD;
            case TermuxConstants.APK_RELEASE_GOOGLE_PLAYSTORE_SIGNING_CERTIFICATE_SHA256_DIGEST:
                return TermuxConstants.APK_RELEASE_GOOGLE_PLAYSTORE;
            default:
                return "Unknown";
        }
    }

}