<?php

namespace App\Business;

use App\Models\Business\LaborExpenseSnapshot;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

class LaborExpenseDataStore
{
    public const MAX_ROWS = 2000;

    /**
     * @return array{rows: array<int, array<string, mixed>>, row_count: int, source_name: ?string, saved_by: ?int, saved_at: ?string}
     */
    public function load(): array
    {
        $snapshot = LaborExpenseSnapshot::query()
            ->where('company_id', company_id())
            ->first();

        return [
            'rows' => is_array($snapshot?->rows) ? array_values($snapshot->rows) : [],
            'row_count' => (int) ($snapshot?->row_count ?? 0),
            'source_name' => $snapshot?->source_name,
            'saved_by' => $snapshot?->saved_by,
            'saved_at' => $snapshot?->saved_at?->toIso8601String(),
        ];
    }

    /**
     * @param  array<int, mixed>  $rows
     * @return array{rows: array<int, array<string, mixed>>, row_count: int, source_name: ?string, saved_by: ?int, saved_at: string}
     */
    public function save(array $rows, ?string $sourceName, ?int $savedBy): array
    {
        if (count($rows) > self::MAX_ROWS) {
            throw ValidationException::withMessages([
                'rows' => '单次最多保存 ' . number_format(self::MAX_ROWS) . ' 行，请拆分后再保存。',
            ]);
        }

        $fields = collect(config('labor_expense_table.fields', []))
            ->filter(static fn (array $field): bool => ($field['kind'] ?? null) !== 'sequence'
                && blank($field['formula'] ?? null))
            ->values();

        if ($fields->isEmpty()) {
            throw ValidationException::withMessages([
                'rows' => '人工费用表没有可保存的录入列。',
            ]);
        }

        $companyId = (int) company_id();
        if ($companyId < 1) {
            throw ValidationException::withMessages([
                'rows' => '当前没有可保存的公司。',
            ]);
        }

        $normalizedRows = [];
        foreach (array_values($rows) as $index => $row) {
            if (! is_array($row)) {
                throw ValidationException::withMessages([
                    'rows' => '第 ' . ($index + 1) . ' 行数据格式无效。',
                ]);
            }

            $record = [];
            $hasValue = false;
            foreach ($fields as $field) {
                $value = $this->normalizeCell($row[$field['key']] ?? null, $field, $index + 1);
                $record[$field['key']] = $value;
                $hasValue = $hasValue || $value !== '';
            }

            if ($hasValue) {
                $normalizedRows[] = $record;
            }
        }

        $sourceName = trim((string) $sourceName);
        $sourceName = $sourceName === '' ? null : mb_substr($sourceName, 0, 191);
        $savedAt = now();

        DB::transaction(function () use ($companyId, $sourceName, $savedBy, $savedAt, $normalizedRows): void {
            LaborExpenseSnapshot::query()->updateOrCreate(
                ['company_id' => $companyId],
                [
                    'source_name' => $sourceName,
                    'rows' => $normalizedRows,
                    'row_count' => count($normalizedRows),
                    'saved_by' => $savedBy,
                    'saved_at' => $savedAt,
                ],
            );
        });

        return [
            'rows' => $normalizedRows,
            'row_count' => count($normalizedRows),
            'source_name' => $sourceName,
            'saved_by' => $savedBy,
            'saved_at' => $savedAt->toIso8601String(),
        ];
    }

    private function normalizeCell(mixed $value, array $field, int $line): mixed
    {
        if ($value === null) {
            return '';
        }

        $text = trim((string) $value);
        if ($text === '') {
            return '';
        }

        if (! in_array($field['kind'] ?? 'text', ['number', 'percent'], true)) {
            if (mb_strlen($text) > 120) {
                throw ValidationException::withMessages([
                    'rows' => "第 {$line} 行“{$field['label']}”不能超过 120 个字符。",
                ]);
            }

            return $text;
        }

        $isPercentText = ($field['kind'] ?? null) === 'percent' && str_ends_with($text, '%');
        $number = str_replace([',', '，', '¥', '￥', '%'], '', $text);
        if (! is_numeric($number)) {
            throw ValidationException::withMessages([
                'rows' => "第 {$line} 行“{$field['label']}”不是有效数字。",
            ]);
        }

        $normalized = (float) $number;

        return $isPercentText ? $normalized / 100 : $normalized;
    }
}