<?php

namespace App\Models\Rule;

use App\Models\BaseModel;

/**
 * RuleDef Model
 * 
 * Rule definitions that can be linked to multiple tests via testrule mapping table.
 */
class RuleDefModel extends BaseModel
{
    protected $table = 'ruledef';
    protected $primaryKey = 'RuleID';
    protected $allowedFields = [
        'RuleCode',
        'RuleName',
        'Description',
        'EventCode',
        'ConditionExpr',
        'ConditionExprCompiled',
        'CreateDate',
        'StartDate',
        'EndDate',
    ];

    protected $useTimestamps = true;
    protected $createdField = 'CreateDate';
    protected $updatedField = 'StartDate';

    protected $useSoftDeletes = true;
    protected $deletedField = 'EndDate';

    /**
     * Fetch active rules for an event scoped by TestSiteID.
     *
     * Rules are standalone and only apply when explicitly linked to a test
     * via the testrule mapping table.
     *
     * @param string $eventCode The event code to filter by
     * @param int|null $testSiteID The test site ID to filter by
     * @return array Array of matching rules
     */
    public function getActiveByEvent(string $eventCode, ?int $testSiteID = null): array
    {
        if ($testSiteID === null) {
            return [];
        }

        return $this->select('ruledef.*')
            ->join('testrule', 'testrule.RuleID = ruledef.RuleID', 'inner')
            ->where('ruledef.EventCode', $eventCode)
            ->where('ruledef.EndDate IS NULL')
            ->where('testrule.TestSiteID', $testSiteID)
            ->where('testrule.EndDate IS NULL')
            ->orderBy('ruledef.RuleID', 'ASC')
            ->findAll();
    }

    /**
     * Get all tests linked to a rule
     *
     * @param int $ruleID The rule ID
     * @return array Array of test site IDs
     */
    public function getLinkedTests(int $ruleID): array
    {
        $db = \Config\Database::connect();
        $result = $db->table('testrule')
            ->where('RuleID', $ruleID)
            ->where('EndDate IS NULL')
            ->select('TestSiteID')
            ->get()
            ->getResultArray();
        
        return array_column($result, 'TestSiteID');
    }

    /**
     * Link a rule to a test
     *
     * @param int $ruleID The rule ID
     * @param int $testSiteID The test site ID
     * @return bool Success status
     */
    public function linkTest(int $ruleID, int $testSiteID): bool
    {
        $db = \Config\Database::connect();
        
        // Check if already linked (and not soft deleted)
        $existing = $db->table('testrule')
            ->where('RuleID', $ruleID)
            ->where('TestSiteID', $testSiteID)
            ->where('EndDate IS NULL')
            ->first();
        
        if ($existing) {
            return true; // Already linked
        }
        
        // Check if soft deleted - restore it
        $softDeleted = $db->table('testrule')
            ->where('RuleID', $ruleID)
            ->where('TestSiteID', $testSiteID)
            ->where('EndDate IS NOT NULL')
            ->first();
        
        if ($softDeleted) {
            return $db->table('testrule')
                ->where('TestRuleID', $softDeleted['TestRuleID'])
                ->update(['EndDate' => null]);
        }
        
        // Create new link
        return $db->table('testrule')->insert([
            'RuleID' => $ruleID,
            'TestSiteID' => $testSiteID,
            'CreateDate' => date('Y-m-d H:i:s'),
        ]);
    }

    /**
     * Unlink a rule from a test (soft delete)
     *
     * @param int $ruleID The rule ID
     * @param int $testSiteID The test site ID
     * @return bool Success status
     */
    public function unlinkTest(int $ruleID, int $testSiteID): bool
    {
        $db = \Config\Database::connect();
        
        return $db->table('testrule')
            ->where('RuleID', $ruleID)
            ->where('TestSiteID', $testSiteID)
            ->where('EndDate IS NULL')
            ->update(['EndDate' => date('Y-m-d H:i:s')]);
    }
}