<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

class DbUtils {

    // summary database table name
    private const TABLE_SUMMARY = "assignsubmission_dta_summary";
    // result database table name
    private const TABLE_RESULT = "assignsubmission_dta_result";

    /**
     * get's summary with all corresponding result entries
     *
     * @param int $assignmentid assignment id to search for
     * @param int $submissionid submission id to search for
     * @return DttResultSummary representing given submission
     */
    public static function getResultSummaryFromDatabase(
        int $assignmentid,
        int $submissionid
    ): DtaResultSummary {
        global $DB;

        //Fetch data from database.
        $summary_record = $DB->get_record(self::TABLE_SUMMARY, array(
            "assignment_id" => $assignmentid,
            "submission_id" => $submissionid
        ));

        $results_array = $DB->get_records(self::TABLE_RESULT, array(
            "assignment_id" => $assignmentid,
            "submission_id" => $submissionid
        ));

        //Create a summary instance.
        $summary = new DtaResultSummary();
        $summary->timestamp = $summary_record->timestamp;
        $summary->globalStacktrace = $summary_record->global_stacktrace;
        $summary->successfulTestCompetencyProfile = $summary_record->successful_competencies;
        $summary->overallTestCompetencyProfile = $summary_record->tested_competencies;
        $summary->results = array();

        //Create result instances and add to array of summary instance.
        foreach($results_array as $rr) {
            $result = new DtaResult();
            $result->packageName = $rr->package_name;
            $result->className = $rr->class_name;
            $result->name = $rr->name;
            $result->state = $rr->state;
            $result->failureType = $rr->failure_type;
            $result->failureReason = $rr->failure_reason;
            $result->stacktrace = $rr->stacktrace;
            $result->columnNumber = $rr->column_number;
            $result->lineNumber = $rr->line_number;
            $result->position = $rr->position;

            $summary->results[] = $result;
        }

        return $summary;
    }

    /**
     * save given result summary and single results to database
     * under given assignment and submission id
     *
     * @param int assignmentid assigment this is submission is linked to
     * @param int submissionid submission of this result
     * @param DttResultSummary instance to persist
     */
    public static function storeResultSummaryToDatabase(
        int $assignmentid,
        int $submissionid,
        DtaResultSummary $summary
    ): void {
        global $DB;

        //Prepare new database entries.
        $summary_record = new stdClass();
        $summary_record->assignment_id = $assignmentid;
        $summary_record->submission_id = $submissionid;
        $summary_record->successful_competencies = $summary->successfulTestCompetencyProfile;
        $summary_record->tested_competencies = $summary->overallTestCompetencyProfile;
        $summary_record->timestamp = $summary->timestamp;
        $summary_record->global_stacktrace = $summary->globalStacktrace;

        //Prepare results to persist to array.
        $result_records = array();
        foreach($summary->results as $r) {
            $record = new stdClass();
            $record->assignment_id = $assignmentid;
            $record->submission_id = $submissionid;
            $record->package_name = $r->packageName;
            $record->class_name = $r->className;
            $record->name = $r->name;
            $record->state = $r->state;
            $record->failure_type = $r->failureType;
            $record->failure_reason = $r->failureReason;
            $record->stacktrace = $r->stacktrace;
            $record->column_number = $r->columnNumber;
            $record->line_number = $r->lineNumber;
            $record->position = $r->position;
            $result_records[] = $record;
        }

        //If results already exist, delete old values beforehand.
        $submission = $DB->get_record(self::TABLE_SUMMARY, array(
            'assignment_id' => $assignmentid,
            'submission_id' => $submissionid
        ));

        if ($submission) {
            $DB->delete_records(self::TABLE_RESULT, array(
                'assignment_id' => $assignmentid,
                'submission_id' => $submissionid
            ));

            $DB->delete_records(self::TABLE_SUMMARY, array(
                'assignment_id' => $assignmentid,
                'submission_id' => $submissionid
            ));
        }

        //Create summary and single result entries.
        $DB->insert_record(self::TABLE_SUMMARY, $summary_record);
        foreach($result_records as $rr) {
            $DB->insert_record(self::TABLE_RESULT, $rr);
        }
    }

    /**
     * cleans up database if plugin is uninstalled
     */
    public static function uninstallPluginCleanUp(): void {
        global $DB;

        $DB->delete_records(self::TABLE_RESULT, null);
        $DB->delete_records(self::TABLE_SUMMARY, null);
    }

}