<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Tax;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Symfony\Component\HttpFoundation\StreamedResponse;

class TaxController extends Controller
{
    /**
     * 一覧：キーワード/適用日範囲で絞り込み + ソート + ページング
     */
    public function list(Request $request)
    {
        $query = Tax::query();

        // 絞り込み
        $keyword = trim((string) $request->input('kw'));
        if ($keyword !== '') {
            // 数値型でも互換のため部分一致を残す
            $query->where('tax_percent', 'like', "%{$keyword}%");
        }
        $from = $request->input('from');
        $to   = $request->input('to');
        if ($from) {
            $query->whereDate('tax_day', '>=', $from);
        }
        if ($to) {
            $query->whereDate('tax_day', '<=', $to);
        }

        // ソート（既定：適用日 降順）
        $sort = $request->input('sort', 'tax_day');
        $type = strtolower($request->input('sort_type', 'desc'));
        $allow = ['tax_day', 'tax_percent', 'updated_at', 'created_at', 'tax_id'];
        if (!in_array($sort, $allow, true)) {
            $sort = 'tax_day';
        }
        if (!in_array($type, ['asc', 'desc'], true)) {
            $type = 'desc';
        }
        $query->orderBy($sort, $type);

        $list = $query->paginate(20)->appends($request->except('page'));

        return view('admin.tax.list', [
            'taxes'      => $list,
            'kw'        => $keyword,
            'from'      => $from,
            'to'        => $to,
            'sort'      => $sort,
            'sort_type' => $type,
        ]);
    }

    public function add(Request $request)
{
    if ($request->isMethod('post')) {
        $data = $request->validate([
            'tax_percent' => ['required', 'numeric', 'min:0', 'max:1000'],
            'tax_day'     => ['required', 'date', 'unique:tax,tax_day'],
        ]);
        $data['operator_id'] = optional(\Auth::user())->ope_id ?? null;
        $data['tax_percent'] = number_format((float)$data['tax_percent'], 2, '.', '');
        \App\Models\Tax::create($data);

        return redirect()->route('tax')->with('success', '登録しました');
    }

    return view('admin.tax.add', [
        'tax'    => null,
        'isEdit' => false,
        'isInfo' => false,
    ]);
}

public function edit(int $tax_id, Request $request)
{
    $tax = \App\Models\Tax::findOrFail($tax_id);

    if ($request->isMethod('post')) {
        $data = $request->validate([
            'tax_percent' => ['required', 'numeric', 'min:0', 'max:1000'],
            'tax_day'     => ['required', 'date', 'unique:tax,tax_day,' . $tax->tax_id . ',tax_id'],
        ]);
        $data['operator_id'] = optional(\Auth::user())->ope_id ?? null;
        $data['tax_percent'] = number_format((float)$data['tax_percent'], 2, '.', '');
        $tax->update($data);

        return redirect()->route('tax')->with('success', '更新しました');
    }

    return view('admin.tax.edit', [
        'tax'    => $tax,
        'isEdit' => true,
        'isInfo' => false,
    ]);
}

public function info(int $tax_id)
{
    $tax = \App\Models\Tax::findOrFail($tax_id);

    return view('admin.tax.info', [
        'tax'    => $tax,
        'isEdit' => false,
        'isInfo' => true,
    ]);
}


    /**
     * 一括削除（一覧のチェックボックスで送られてくる想定）
     * フォーム側 name="ids[]" の配列を POST
     */
    public function delete(Request $request)
    {
        $ids = (array) $request->input('ids', []);
        $ids = array_values(array_filter($ids, fn($v) => preg_match('/^\d+$/', (string) $v)));

        if (empty($ids)) {
            return redirect()->route('tax')->with('error', '削除対象が選択されていません。');
        }

        Tax::whereIn('tax_id', $ids)->delete();

        return redirect()->route('tax')->with('success', '削除しました');
    }

    /**
     * CSVインポート
     * カラム想定: tax_percent, tax_day
     * - 1行目はヘッダ可
     * - tax_day をキーとして「存在すれば更新 / 無ければ作成」
     */
    public function import(Request $request)
    {
        $request->validate([
            'file' => ['required', 'file', 'mimetypes:text/plain,text/csv,text/tsv', 'max:2048'],
        ]);

        $path = $request->file('file')->getRealPath();
        if (!$path || !is_readable($path)) {
            return redirect()->route('tax')->with('error', 'ファイルを読み込めません。');
        }

        $created = 0;
        $updated = 0;
        $skipped = 0;

        DB::beginTransaction();
        try {
            if (($fp = fopen($path, 'r')) !== false) {
                $line = 0;
                while (($row = fgetcsv($fp)) !== false) {
                    $line++;

                    // 空行スキップ
                    if (count($row) === 1 && trim((string) $row[0]) === '') {
                        continue;
                    }

                    // ヘッダ行っぽい場合（1行目に 'tax_percent' を含む）
                    if ($line === 1) {
                        $joined = strtolower(implode(',', $row));
                        if (str_contains($joined, 'tax_percent') && str_contains($joined, 'tax_day')) {
                            continue; // ヘッダスキップ
                        }
                    }

                    // 取り出し（列数が足りない場合スキップ）
                    $percent = $row[0] ?? null;
                    $day     = $row[1] ?? null;
                    if ($percent === null || $day === null) {
                        $skipped++;
                        continue;
                    }

                    // 正規化 & 検証
                    $percent = trim((string) $percent);
                    $percent = rtrim($percent, '%');
                    $percent = preg_replace('/[^\d.]/', '', $percent) ?? '0';
                    $percentF = (float) $percent;
                    if ($percentF < 0) {
                        $skipped++;
                        continue;
                    }
                    $percentF = (float) number_format($percentF, 2, '.', '');

                    $day = date('Y-m-d', strtotime((string) $day));
                    if (!$day) {
                        $skipped++;
                        continue;
                    }

                    // upsert: 適用日ユニーク運用
                    $existing = Tax::whereDate('tax_day', $day)->first();
                    $payload = [
                        'tax_percent' => $percentF,
                        'tax_day'     => $day,
                        'operator_id' => optional(Auth::user())->ope_id ?? null,
                    ];

                    if ($existing) {
                        $existing->update($payload);
                        $updated++;
                    } else {
                        Tax::create($payload);
                        $created++;
                    }
                }
                fclose($fp);
            }

            DB::commit();
            return redirect()->route('tax')->with('success', "インポート完了：新規 {$created} 件、更新 {$updated} 件、スキップ {$skipped} 件");
        } catch (\Throwable $e) {
            DB::rollBack();
            return redirect()->route('tax')->with('error', 'インポートに失敗しました：' . $e->getMessage());
        }
    }

    /**
     * CSVエクスポート：現在の絞り込み/ソート条件を反映
     */
    public function export(Request $request): StreamedResponse
    {
        $query = Tax::query();

        $keyword = trim((string) $request->input('kw'));
        if ($keyword !== '') {
            $query->where('tax_percent', 'like', "%{$keyword}%");
        }
        $from = $request->input('from');
        $to   = $request->input('to');
        if ($from) {
            $query->whereDate('tax_day', '>=', $from);
        }
        if ($to) {
            $query->whereDate('tax_day', '<=', $to);
        }

        $sort = $request->input('sort', 'tax_day');
        $type = strtolower($request->input('sort_type', 'desc'));
        $allow = ['tax_day', 'tax_percent', 'updated_at', 'created_at', 'tax_id'];
        if (!in_array($sort, $allow, true)) {
            $sort = 'tax_day';
        }
        if (!in_array($type, ['asc', 'desc'], true)) {
            $type = 'desc';
        }
        $query->orderBy($sort, $type);

        $filename = 'tax_' . now()->format('Ymd_His') . '.csv';

        return response()->streamDownload(function () use ($query) {
            $out = fopen('php://output', 'w');
            // Header（設計書の主要カラム）
            fputcsv($out, ['消費税ID', '消費税率', '適用日', '登録日時', '更新日時', '更新オペレータID']);
            $query->chunk(500, function ($rows) use ($out) {
                foreach ($rows as $r) {
                    fputcsv($out, [
                        $r->tax_id,
                        // 画面仕様に合わせたい場合は getDisplayTaxPercentAttribute() に置換可
                        is_numeric($r->tax_percent)
                            ? number_format((float) $r->tax_percent, 2, '.', '')
                            : (string) $r->tax_percent,
                        optional($r->tax_day)->format('Y-m-d'),
                        optional($r->created_at)->format('Y-m-d H:i:s'),
                        optional($r->updated_at)->format('Y-m-d H:i:s'),
                        $r->operator_id,
                    ]);
                }
            });
            fclose($out);
        }, $filename, [
            'Content-Type' => 'text/csv; charset=UTF-8',
        ]);
    }
}