<?php

namespace App\Models;

/**
 * Claims Collection dashboard backed by claim_report.
 * Falls back to ticket_master only for non-dump TPAs when env flag is true.
 * Reuses V2 KPI SQL; claim fact tables are rewritten at query time.
 */
class ClaimReportDashboardModel extends ClaimsCollectionV2DashboardModel
{
    /** @var array<int, string> */
    protected array $claimsTableCache = [];

    /**
     * Resolve claim fact table for a policy.
     *
     * - TPA dump table exists → always claim_report (even if empty; never ticket_master).
     * - Dump table missing / TPA unmapped → ticket_master only when
     *   CLAIM_REPORT_FALLBACK_TO_TICKET_MASTER=true; otherwise claim_report.
     */
    public function resolveClaimsTable(int $policyId): string
    {
        if (isset($this->claimsTableCache[$policyId])) {
            return $this->claimsTableCache[$policyId];
        }

        $db = \Config\Database::connect($this->DBGroup);
        $fallbackEnabled = $this->isTicketMasterFallbackEnabled();

        if ($policyId <= 0) {
            return $this->claimsTableCache[$policyId] = $fallbackEnabled
                ? 'ticket_master'
                : 'claim_report';
        }

        // Table missing — cannot query claim_report; ticket_master is the only option.
        if (!$db->tableExists('claim_report')) {
            return $this->claimsTableCache[$policyId] = 'ticket_master';
        }

        $policy = $db->table('client_policy')
            ->select('tpa_id')
            ->where('id', $policyId)
            ->get()
            ->getRowArray();

        $tpaId     = (int) ($policy['tpa_id'] ?? 0);
        $dumpTable = $this->getTpaDumpTableMap()[$tpaId] ?? null;

        // Mapped dump TPA with existing dump table → claim_report only.
        if ($dumpTable !== null && $db->tableExists($dumpTable)) {
            return $this->claimsTableCache[$policyId] = 'claim_report';
        }

        // Non-dump / missing dump table → env-gated ticket_master fallback.
        return $this->claimsTableCache[$policyId] = $fallbackEnabled
            ? 'ticket_master'
            : 'claim_report';
    }

    protected function isTicketMasterFallbackEnabled(): bool
    {
        return filter_var(
            env('CLAIM_REPORT_FALLBACK_TO_TICKET_MASTER', false),
            FILTER_VALIDATE_BOOLEAN
        );
    }

    /**
     * @return array<int, string>
     */
    protected function getTpaDumpTableMap(): array
    {
        return [
            (int) env('VIDAL_PRIMARY_KEY_CONSTANT')       => 'claims_dump_vidal',
            (int) env('ABHI_PRIMARY_KEY_CONSTANT')        => 'claims_dump_abhi',
            (int) env('MEDI_ASSIST_PRIMARY_KEY_CONSTANT') => 'claims_dump_medi_assist',
            (int) env('FHPL_PRIMARY_KEY_CONSTANT')        => 'claims_dump_fhpl',
            (int) env('R_CARE_PRIMARY_KEY_CONSTANT')      => 'claims_dump_reliance',
            (int) env('ICICI_PRIMARY_KEY_CONSTANT')       => 'claims_dump_icici',
        ];
    }

    protected function runKpiQuery(string $sql, int $policyId): array
    {
        $sql = str_replace(['\\t', '\\n', '\\r'], ["\t", "\n", "\r"], $sql);

        $claimsTable = $this->resolveClaimsTable($policyId);
        if ($claimsTable !== 'ticket_master') {
            $sql = preg_replace('/\bticket_master\b/', $claimsTable, $sql) ?? $sql;
        }

        $db    = \Config\Database::connect($this->DBGroup);
        $query = $db->query($sql, ['policy_id' => $policyId]);

        return $query->getResultArray();
    }

    public function getAllKpis(int $policyId): array
    {
        $out = parent::getAllKpis($policyId);
        $out['_meta'] = [
            'claims_source' => $this->resolveClaimsTable($policyId),
        ];

        return $out;
    }
}