<?php

namespace App\Commands;

use CodeIgniter\CLI\BaseCommand;
use CodeIgniter\CLI\CLI;

/**
 * Seed claim_report from existing dump-sourced ticket_master rows.
 *
 * Usage:
 *   php spark claim:backfill-report
 *   php spark claim:backfill-report --policy=4687
 *   php spark claim:backfill-report --limit=5000
 */
class BackfillClaimReport extends BaseCommand
{
    protected $group       = 'Claims';
    protected $name        = 'claim:backfill-report';
    protected $description = 'Backfill claim_report from ticket_master dump claims';
    protected $usage       = 'claim:backfill-report [--policy=ID] [--limit=N]';
    protected $options     = [
        '--policy' => 'Optional client_policy_id to limit backfill',
        '--limit'  => 'Batch size (default 1000)',
    ];

    public function run(array $params)
    {
        $db = db_connect();

        if (!$db->tableExists('claim_report')) {
            CLI::error('Table claim_report does not exist. Run migrations first.');
            return EXIT_ERROR;
        }

        if (!$db->tableExists('ticket_master')) {
            CLI::error('Table ticket_master does not exist.');
            return EXIT_ERROR;
        }

        $policyId = (int) (CLI::getOption('policy') ?? 0);
        $limit    = (int) (CLI::getOption('limit') ?? 1000);
        if ($limit <= 0) {
            $limit = 1000;
        }

        $offset = 0;
        $totalInserted = 0;
        $totalUpdated  = 0;
        $totalSkipped  = 0;
        $now = date('Y-m-d H:i:s');

        CLI::write('Backfilling claim_report from ticket_master (dump-sourced claims)...', 'yellow');

        while (true) {
            $builder = $db->table('ticket_master')
                ->where('is_active', 1)
                ->groupStart()
                    ->where('claim_dump_ref_id IS NOT NULL', null, false)
                    ->orWhere('file_id IS NOT NULL', null, false)
                ->groupEnd()
                ->where("claim_number IS NOT NULL AND TRIM(claim_number) != ''", null, false)
                ->orderBy('id', 'ASC')
                ->limit($limit, $offset);

            if ($policyId > 0) {
                $builder->where('client_policy_id', $policyId);
            }

            $tickets = $builder->get()->getResultArray();
            if ($tickets === []) {
                break;
            }

            $rows = [];
            foreach ($tickets as $tm) {
                $claimNumber = trim((string) ($tm['claim_number'] ?? ''));
                $clientPolicyId = (int) ($tm['client_policy_id'] ?? 0);
                if ($claimNumber === '' || $clientPolicyId <= 0) {
                    $totalSkipped++;
                    continue;
                }

                $rows[] = [
                    'tpa_id'           => $tm['tpa_id'] ?? null,
                    'client_id'        => $tm['client_id'] ?? null,
                    'client_policy_id' => $clientPolicyId,
                    'file_id'          => $tm['file_id'] ?? null,
                    'ticket_id'        => $tm['id'] ?? null,
                    'source_table'     => null,
                    'source_row_id'    => $tm['claim_dump_ref_id'] ?? null,
                    'claim_number'     => $claimNumber,
                    'emp_code'         => $tm['emp_code'] ?? null,
                    'tpa_no'           => $tm['tpa_no'] ?? null,
                    'emp_id'           => $tm['emp_id'] ?? null,
                    'insured_emp_id'   => $tm['insured_emp_id'] ?? null,
                    'claim_amount'     => $tm['claim_amount'] ?? null,
                    'approved_amount'  => $tm['approved_amount'] ?? null,
                    'incurred_amount'  => $tm['approved_amount'] ?? $tm['claim_amount'] ?? null,
                    'si_amt'           => $tm['si_amt'] ?? null,
                    'tpa_claim_status' => $tm['tpa_claim_status'] ?? null,
                    'claim_status_id'  => $tm['claim_status_id'] ?? null,
                    'tpa_claim_type'   => $tm['tpa_claim_type'] ?? null,
                    'tpa_ailments'     => $tm['tpa_ailments'] ?? null,
                    'doa'              => $tm['doa'] ?? null,
                    'dod'              => $tm['dod'] ?? null,
                    'date_of_intimat'  => $tm['date_of_intimat'] ?? null,
                    'settled_date'     => $tm['settled_date'] ?? null,
                    'approved_date'    => $tm['approved_date'] ?? null,
                    'claim_dump_date'  => $tm['claim_dump_date'] ?? null,
                    'hospital_name'    => $tm['hospital_name'] ?? null,
                    'hospital_city'    => $tm['hospital_city'] ?? null,
                    'hospital_state'   => $tm['hospital_state'] ?? null,
                    'hospital_pin_code'=> $tm['hospital_pin_code'] ?? null,
                    'hospital_address' => $tm['hospital_address'] ?? null,
                    'gender'           => null,
                    'age'              => null,
                    'relation'         => $tm['relationship'] ?? null,
                    'is_active'        => 1,
                    'created_at'       => $now,
                    'updated_at'       => $now,
                ];
            }

            if ($rows !== []) {
                $result = $this->upsertRows($db, $rows);
                if ($result === false) {
                    CLI::error('Upsert failed at offset ' . $offset);
                    return EXIT_ERROR;
                }
                $totalInserted += $result['inserted'];
                $totalUpdated  += $result['updated'];
            }

            $offset += count($tickets);
            CLI::write("Processed {$offset} ticket_master rows...", 'green');

            if (count($tickets) < $limit) {
                break;
            }
        }

        CLI::write("Done. inserted≈{$totalInserted}, updated≈{$totalUpdated}, skipped={$totalSkipped}", 'green');
        return EXIT_SUCCESS;
    }

    /**
     * @param list<array<string, mixed>> $rows
     * @return array{inserted:int,updated:int}|false
     */
    private function upsertRows($db, array $rows)
    {
        $columns = [
            'tpa_id', 'client_id', 'client_policy_id', 'file_id', 'ticket_id',
            'source_table', 'source_row_id', 'claim_number', 'emp_code', 'tpa_no',
            'emp_id', 'insured_emp_id', 'claim_amount', 'approved_amount', 'incurred_amount',
            'si_amt', 'tpa_claim_status', 'claim_status_id', 'tpa_claim_type', 'tpa_ailments',
            'doa', 'dod', 'date_of_intimat', 'settled_date', 'approved_date', 'claim_dump_date',
            'hospital_name', 'hospital_city', 'hospital_state', 'hospital_pin_code', 'hospital_address',
            'gender', 'age', 'relation', 'is_active', 'created_at', 'updated_at',
        ];

        $updateCols = array_values(array_diff($columns, ['client_policy_id', 'claim_number', 'created_at']));
        $inserted = 0;
        $updated  = 0;

        foreach (array_chunk($rows, 100) as $chunk) {
            $placeholders = [];
            $binds = [];
            foreach ($chunk as $row) {
                $rowPlaceholders = [];
                foreach ($columns as $col) {
                    $rowPlaceholders[] = '?';
                    $binds[] = $row[$col] ?? null;
                }
                $placeholders[] = '(' . implode(', ', $rowPlaceholders) . ')';
            }

            $updates = [];
            foreach ($updateCols as $col) {
                $updates[] = '`' . $col . '` = VALUES(`' . $col . '`)';
            }

            $sql = 'INSERT INTO `claim_report` (`' . implode('`, `', $columns) . '`) VALUES '
                . implode(', ', $placeholders)
                . ' ON DUPLICATE KEY UPDATE ' . implode(', ', $updates);

            if ($db->query($sql, $binds) === false) {
                return false;
            }

            $affected = $db->affectedRows();
            // MySQL: 1 = insert, 2 = update existing
            $updated += (int) floor($affected / 2);
            $inserted += max(0, $affected - (2 * (int) floor($affected / 2)));
        }

        return ['inserted' => $inserted, 'updated' => $updated];
    }
}