<?php

declare(strict_types=1);

namespace App\Repositories;

use App\Core\Database;

/**
 * Independent execution path for the historical gmov function.
 *
 * This repository preserves the old Oracle outer-join shape and executes the
 * recovered query independently against NJCH, JCKH, and MNH. It intentionally
 * does not call MultiBranchPatientActivityService.
 */
final class LegacyMultiBranchPatientActivityRepository
{
    /** @var array<int, string> */
    private const BRANCHES = ['njch', 'jckh', 'mnh'];

    /**
     * @return array<int, array{month_id:int,month_name:string,njch:float,jckh:float,mnh:float,total:float}>
     */
    public function monthlyOutpatientVisits(
        int $year,
        ?string $fromDate = null,
        ?string $toDate = null
    ): array {
        $branchRows = [];

        foreach (self::BRANCHES as $hospitalCode) {
            $branchRows[$hospitalCode] = $this->legacyRowsForBranch(
                $hospitalCode,
                $year,
                $fromDate,
                $toDate
            );
        }

        return $this->mergeBranches($branchRows);
    }

    /**
     * Exact recovered gmov SQL contract:
     * - RCP_VISIT.CLASSCODE = 2
     * - no emergency exclusion
     * - SERVSTATUS NOT IN ('C','F')
     * - SCHED_SERIAL IS NOT NULL
     * - same query is executed independently against all three branch databases
     *
     * @return array<int, array<string, mixed>>
     */
    private function legacyRowsForBranch(
        string $hospitalCode,
        int $year,
        ?string $fromDate,
        ?string $toDate
    ): array {
        $where = 'EXTRACT(YEAR FROM r.expecteddonedate) = :legacy_gmov_year';
        $params = ['legacy_gmov_year' => $year];

        if ($fromDate !== null && $toDate !== null) {
            $where = "r.expecteddonedate >= TO_DATE(:legacy_gmov_from_date, 'YYYY-MM-DD')\n"
                   . "              AND r.expecteddonedate < TO_DATE(:legacy_gmov_to_date, 'YYYY-MM-DD') + 1";
            $params = [
                'legacy_gmov_from_date' => $fromDate,
                'legacy_gmov_to_date' => $toDate,
            ];
        }

        $sql = "
            SELECT
                months.code month_id,
                months.name_en month_name,
                NVL(activity.month_wise_count, 0) period_value
            FROM
                (
                    SELECT
                        COUNT(1) month_wise_count,
                        TO_NUMBER(TO_CHAR(r.expecteddonedate, 'MM')) month_no
                    FROM rcp_visit v,
                         rcp_service_reservation r
                    WHERE v.classcode = 2
                      AND {$where}
                      AND v.hosp_id = r.hosp_id
                      AND v.patientid = r.patientid
                      AND v.visit_id = r.visit_id
                      AND r.servstatus NOT IN ('C', 'F')
                      AND r.sched_serial IS NOT NULL
                    GROUP BY TO_NUMBER(TO_CHAR(r.expecteddonedate, 'MM'))
                ) activity,
                (
                    SELECT code, name_en
                    FROM sec_lookup_detail
                    WHERE parent_id = 1
                ) months
            WHERE activity.month_no (+) = months.code
            ORDER BY months.code
        ";

        return Database::fetchAll($hospitalCode, $sql, $params);
    }

    /**
     * @param array<string, array<int, array<string, mixed>>> $branchRows
     * @return array<int, array{month_id:int,month_name:string,njch:float,jckh:float,mnh:float,total:float}>
     */
    private function mergeBranches(array $branchRows): array
    {
        $out = [];

        for ($month = 1; $month <= 12; $month++) {
            $row = [
                'month_id' => $month,
                'month_name' => '',
                'njch' => 0.0,
                'jckh' => 0.0,
                'mnh' => 0.0,
                'total' => 0.0,
            ];

            foreach (self::BRANCHES as $hospitalCode) {
                foreach ($branchRows[$hospitalCode] ?? [] as $candidate) {
                    if ((int)($candidate['month_id'] ?? 0) !== $month) {
                        continue;
                    }
                    if ($row['month_name'] === '') {
                        $row['month_name'] = trim((string)($candidate['month_name'] ?? ''));
                    }
                    $row[$hospitalCode] = (float)($candidate['period_value'] ?? 0);
                    break;
                }
            }

            $row['total'] = $row['njch'] + $row['jckh'] + $row['mnh'];
            $out[] = $row;
        }

        return $out;
    }
}
