<?php

namespace App\Exports;

use App\Models\PurchaseOrderModel;
use App\Models\StoreModel;
use App\Services\PurchaseItemService;
use Illuminate\Support\Collection;
use Maatwebsite\Excel\Concerns\FromCollection;
use Maatwebsite\Excel\Concerns\WithStrictNullComparison;
use Maatwebsite\Excel\Concerns\WithStyles;
use Maatwebsite\Excel\Concerns\WithTitle;
use PhpOffice\PhpSpreadsheet\Style\Alignment;
use PhpOffice\PhpSpreadsheet\Style\Border;
use PhpOffice\PhpSpreadsheet\Style\Fill;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;

/**
 * 门店购买详情导出 · 单门店工作表
 */
class PurchaseStoreSheet implements FromCollection, WithStrictNullComparison, WithStyles, WithTitle
{
    /** 数量列填充色（浅黄） */
    private const string QUANTITY_FILL = 'FFFFF2CC';

    /** 金额列填充色（浅红） */
    private const string AMOUNT_FILL = 'FFFFCCCC';

    /** 金额格式：￥ + 两位小数 */
    private const string CURRENCY_FORMAT = '"￥"#,##0.00';

    private ?Collection $rows = null;

    /** @var array<int, string> 特殊行索引（1 起）=> 类型（title/header/summary） */
    private array $specialRows = [];

    /** @var array<int, array{quantity: int, amount: float}> 明细行索引 => 填色判断数据 */
    private array $rowData = [];

    /** @var array{quantity: int, amount: float} 合计行填色判断数据 */
    private array $summaryTotals = ['quantity' => 0, 'amount' => 0.0];

    /** 列头所在行索引 */
    private int $headerRow = 1;

    /** 数据末行索引 */
    private int $lastRow = 1;

    public function __construct(
        private readonly PurchaseOrderModel $purchase,
        private readonly StoreModel $store,
        private readonly string $sheetTitle,
    ) {
    }

    /**
     * 导出行：标题/空行/列头/明细/合计
     */
    public function collection(): Collection
    {
        if ($this->rows !== null) {
            return $this->rows;
        }

        $items = app(PurchaseItemService::class)->storeSummaryRows($this->purchase->id, $this->store->id);

        $rows = [];
        $rowIndex = 0;

        // 标题行
        $rows[] = [$this->store->name . ' · 采购单 ' . $this->purchase->purchase_no];
        $this->specialRows[++$rowIndex] = 'title';

        // 空行
        $rows[] = [''];
        $rowIndex++;

        // 列头
        $rows[] = ['序号', '品名', '市场', '包规', '单位', '单价', '数量', '重量(斤)', '预计金额'];
        $this->specialRows[++$rowIndex] = 'header';
        $this->headerRow = $rowIndex;

        // 明细行
        $totalQuantity = 0;
        $totalWeight = '0';
        $totalAmount = '0';
        foreach (array_values($items) as $sort => $item) {
            $this->rowData[++$rowIndex] = [
                'quantity' => (int) $item['quantity'],
                'amount' => (float) $item['amount'],
            ];
            $rows[] = [
                $sort + 1,
                $item['product_name'],
                $item['market'],
                $item['product_spec'],
                $item['unit'],
                (float) $item['price'],
                (int) $item['quantity'],
                (float) $item['weight'],
                (float) $item['amount'],
            ];
            $totalQuantity += (int) $item['quantity'];
            $totalWeight = bcadd($totalWeight, (string) $item['weight'], 3);
            $totalAmount = bcadd($totalAmount, (string) $item['amount'], 2);
        }

        // 合计行
        $rows[] = ['', '合计', '', '', '', '', $totalQuantity, (float) $totalWeight, (float) $totalAmount];
        $this->specialRows[++$rowIndex] = 'summary';
        $this->lastRow = $rowIndex;
        $this->summaryTotals = ['quantity' => $totalQuantity, 'amount' => (float) $totalAmount];

        return $this->rows = collect($rows);
    }

    public function title(): string
    {
        return $this->sheetTitle;
    }

    /**
     * 标题/列头/合计加粗；全表居中 + 全边框；金额类列货币格式；
     * 数量（浅黄）/金额（浅红）按值条件填色（0 不填、列头固定填色），冻结列头
     */
    public function styles(Worksheet $sheet): array
    {
        $this->collection();

        $sheet->freezePane('A' . ($this->headerRow + 1));
        $widths = [6, 24, 12, 14, 8, 10, 10, 12, 12];
        foreach ($widths as $index => $width) {
            $sheet->getColumnDimension(\PhpOffice\PhpSpreadsheet\Cell\Coordinate::stringFromColumnIndex($index + 1))
                ->setWidth($width);
        }

        // 全部单元格水平/垂直居中
        $sheet->getStyle('A1:I' . $this->lastRow)
            ->getAlignment()
            ->setHorizontal(Alignment::HORIZONTAL_CENTER)
            ->setVertical(Alignment::VERTICAL_CENTER);

        // 表格区域（列头 → 合计行）添加所有边框
        $sheet->getStyle('A' . $this->headerRow . ':I' . $this->lastRow)
            ->getBorders()
            ->getAllBorders()
            ->setBorderStyle(Border::BORDER_THIN);

        // 金额类列（单价/预计金额）货币格式：￥ + 两位小数
        foreach (['F', 'I'] as $column) {
            $sheet->getStyle($column . ($this->headerRow + 1) . ':' . $column . $this->lastRow)
                ->getNumberFormat()
                ->setFormatCode(self::CURRENCY_FORMAT);
        }

        // 数量列（G）：有数据浅黄，0 无背景，列头固定浅黄
        $this->fillCell($sheet, 'G' . $this->headerRow, self::QUANTITY_FILL);
        foreach ($this->rowData as $row => $data) {
            if ($data['quantity'] > 0) {
                $this->fillCell($sheet, 'G' . $row, self::QUANTITY_FILL);
            }
        }
        if ($this->summaryTotals['quantity'] > 0) {
            $this->fillCell($sheet, 'G' . $this->lastRow, self::QUANTITY_FILL);
        }

        // 金额列（I）：有数据浅红，0 无背景，列头固定浅红
        $this->fillCell($sheet, 'I' . $this->headerRow, self::AMOUNT_FILL);
        foreach ($this->rowData as $row => $data) {
            if ($data['amount'] > 0) {
                $this->fillCell($sheet, 'I' . $row, self::AMOUNT_FILL);
            }
        }
        if ($this->summaryTotals['amount'] > 0) {
            $this->fillCell($sheet, 'I' . $this->lastRow, self::AMOUNT_FILL);
        }

        $styles = [];
        foreach ($this->specialRows as $row => $type) {
            $style = match ($type) {
                'title' => ['font' => ['bold' => true, 'size' => 14]],
                'header', 'summary' => ['font' => ['bold' => true]],
                default => [],
            };
            if ($style !== []) {
                $styles[$row] = $style;
            }
        }

        return $styles;
    }

    /**
     * 单元格纯色填充
     */
    private function fillCell(Worksheet $sheet, string $coordinate, string $argb): void
    {
        $sheet->getStyle($coordinate)
            ->getFill()
            ->setFillType(Fill::FILL_SOLID)
            ->getStartColor()
            ->setARGB($argb);
    }
}