import 'dart:math' as math;

import 'package:flutter/material.dart';

import '../core/theme/context_tokens.dart';
import '../core/theme/app_dims.g.dart';

/// 右侧滑入抽屉呈现（对齐原型 .drawer / .drawer-mask）。
/// useRootNavigator:false → 只覆盖内容区（分支 Navigator），不盖侧栏/顶栏。
Future<T?> showOrderDetailDrawer<T>(
  BuildContext context, {
  required WidgetBuilder builder,
}) {
  return showGeneralDialog<T>(
    context: context,
    useRootNavigator: false,
    barrierDismissible: true,
    barrierLabel: '关闭',
    barrierColor: Colors.black.withValues(alpha: 0.32), // .drawer-mask scrim
    transitionDuration: const Duration(milliseconds: 250),
    pageBuilder: (ctx, _, __) {
      final w = math.min(600.0, MediaQuery.of(ctx).size.width * 0.94);
      return Align(
        alignment: Alignment.centerRight,
        child: Material(
          color: ctx.tokens.surface,
          elevation: 16,
          // 抽屉在 app_shell 的全局 SelectionArea 之外（独立 overlay）→ 自带一层，文字可选中复制。
          child: SelectionArea(
            child: SizedBox(
                width: w, height: double.infinity, child: builder(ctx)),
          ),
        ),
      );
    },
    transitionBuilder: (ctx, anim, _, child) => SlideTransition(
      position: Tween<Offset>(begin: const Offset(1, 0), end: Offset.zero)
          .animate(CurvedAnimation(parent: anim, curve: Curves.easeOutCubic)),
      child: child,
    ),
  );
}

/// 抽屉明细行（对齐原型 .lines .lr，5 列：商品·编码 / 系列·规格 / 数量 / 单价 / 金额）。
class OrderLine {
  final String name;
  final String code;
  final String series;
  final String spec;
  final String qty;
  final String price; // 已算好文案（或「待定价」）
  final String amount;
  final bool pending; // 单价<=0：单价/金额显示待定价样式
  const OrderLine({
    required this.name,
    required this.code,
    required this.series,
    required this.spec,
    required this.qty,
    required this.price,
    required this.amount,
    this.pending = false,
  });
}

/// 抽屉底部操作分组（对齐原型 .dact-group：标签 + 一排按钮）。
class DrawerActionGroup {
  final String label;
  final List<Widget> buttons;
  const DrawerActionGroup(this.label, this.buttons);
}

/// 详情抽屉骨架（对齐原型 openDetail 布局）：
/// 头(单号+X) / 信息行(.drow) / 明细标题 / 明细表(.lines) / 合计(.ltotal) / 操作组(.dactions)。
class OrderDetailDrawer extends StatelessWidget {
  final String title;
  final List<({String label, Widget value})> infoRows;
  final String linesLabel; // 入库明细 / 出库明细
  final List<OrderLine> lines;
  final String totalText; // 合计金额（已格式化）
  final List<DrawerActionGroup> actionGroups;

  const OrderDetailDrawer({
    super.key,
    required this.title,
    required this.infoRows,
    required this.linesLabel,
    required this.lines,
    required this.totalText,
    required this.actionGroups,
  });

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        // ── 头：单号 + 关闭 ──（.drawer-head）
        Container(
          padding: const EdgeInsets.fromLTRB(20, 18, 16, 18),
          decoration:
              BoxDecoration(border: Border(bottom: BorderSide(color: t.border))),
          child: Row(
            children: [
              Expanded(
                child: Text(title,
                    style: TextStyle(
                        fontSize: AppDims.fsH2,
                        fontWeight: FontWeight.w700,
                        color: t.heading)),
              ),
              IconButton(
                icon: Icon(Icons.close, size: 22, color: t.muted),
                splashRadius: 20,
                onPressed: () => Navigator.of(context).pop(),
              ),
            ],
          ),
        ),
        Expanded(
          child: SingleChildScrollView(
            padding: const EdgeInsets.fromLTRB(20, 18, 20, 20),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                // ── 信息行（.drow）──
                for (final r in infoRows) _DrawerRow(label: r.label, value: r.value),
                // ── 明细标题 ──
                Padding(
                  padding: const EdgeInsets.fromLTRB(0, 16, 0, 8),
                  child: Text(linesLabel,
                      style: TextStyle(fontSize: AppDims.fsSm, color: t.muted)),
                ),
                _LinesTable(lines: lines),
                // ── 合计（.ltotal）──
                Padding(
                  padding: const EdgeInsets.fromLTRB(4, 8, 4, 0),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: [
                      Text('合计金额 ',
                          style: TextStyle(
                              fontSize: AppDims.fsBody, color: t.muted)),
                      const SizedBox(width: 6),
                      Text(totalText,
                          style: TextStyle(
                              fontSize: 18,
                              fontFamily: 'monospace',
                              fontWeight: FontWeight.w700,
                              color: t.accent)),
                    ],
                  ),
                ),
                // ── 操作组（.dactions）──
                if (actionGroups.isNotEmpty) const SizedBox(height: 18),
                for (var i = 0; i < actionGroups.length; i++) ...[
                  if (i > 0) const SizedBox(height: 14),
                  _ActionGroup(group: actionGroups[i]),
                ],
              ],
            ),
          ),
        ),
      ],
    );
  }
}

class _DrawerRow extends StatelessWidget {
  final String label;
  final Widget value;
  const _DrawerRow({required this.label, required this.value});

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    return Container(
      padding: const EdgeInsets.symmetric(vertical: 11),
      decoration: BoxDecoration(
          border: Border(bottom: BorderSide(color: t.borderSubtle))),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(label,
              style: TextStyle(fontSize: AppDims.fsBody, color: t.muted)),
          const Spacer(),
          DefaultTextStyle(
            style: TextStyle(
                fontSize: AppDims.fsBody,
                fontWeight: FontWeight.w600,
                color: t.text),
            child: value,
          ),
        ],
      ),
    );
  }
}

class _LinesTable extends StatelessWidget {
  final List<OrderLine> lines;
  const _LinesTable({required this.lines});

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    return Container(
      decoration: BoxDecoration(
        border: Border.all(color: t.border),
        borderRadius: BorderRadius.circular(AppDims.rMd),
      ),
      child: Column(
        children: [
          // 表头
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 9),
            decoration: BoxDecoration(
              color: t.thBg,
              borderRadius: const BorderRadius.vertical(top: Radius.circular(6)),
            ),
            child: _lineRow(
              context,
              c1: Text('商品 · 编码',
                  style: _hStyle(t), overflow: TextOverflow.ellipsis),
              c2: Text('系列 / 规格', style: _hStyle(t)),
              c3: Text('数量', textAlign: TextAlign.right, style: _hStyle(t)),
              c4: Text('单价', textAlign: TextAlign.right, style: _hStyle(t)),
              c5: Text('金额', textAlign: TextAlign.right, style: _hStyle(t)),
            ),
          ),
          for (var i = 0; i < lines.length; i++)
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 9),
              decoration: BoxDecoration(
                border: i == 0
                    ? null
                    : Border(top: BorderSide(color: t.borderSubtle)),
              ),
              child: _lineRow(
                context,
                c1: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text(lines[i].name,
                        style: TextStyle(
                            fontSize: AppDims.fsBody,
                            fontWeight: FontWeight.w600,
                            color: t.text)),
                    Text(lines[i].code,
                        style: TextStyle(
                            fontSize: AppDims.fsXs,
                            fontFamily: 'monospace',
                            color: t.faint)),
                  ],
                ),
                c2: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    Text(lines[i].series,
                        style:
                            TextStyle(fontSize: AppDims.fsSm, color: t.text)),
                    Text(lines[i].spec,
                        style:
                            TextStyle(fontSize: AppDims.fsXs, color: t.muted)),
                  ],
                ),
                c3: Text(lines[i].qty,
                    textAlign: TextAlign.right,
                    style: const TextStyle(fontFamily: 'monospace')),
                c4: _priceCell(context, lines[i].price, lines[i].pending),
                c5: _priceCell(context, lines[i].amount, lines[i].pending,
                    accent: true),
              ),
            ),
        ],
      ),
    );
  }

  TextStyle _hStyle(dynamic t) => TextStyle(
      fontSize: AppDims.fsSm, color: t.muted, fontWeight: FontWeight.w600);

  Widget _priceCell(BuildContext context, String text, bool pending,
      {bool accent = false}) {
    final t = context.tokens;
    if (pending) {
      return Text(text,
          textAlign: TextAlign.right,
          style: TextStyle(
              fontSize: AppDims.fsXs,
              color: t.warn,
              fontWeight: FontWeight.w600));
    }
    return Text(text,
        textAlign: TextAlign.right,
        style: TextStyle(
            fontFamily: 'monospace',
            fontWeight: accent ? FontWeight.w700 : FontWeight.w400,
            color: accent ? t.text : t.text));
  }

  // 5 列布局（对齐原型 grid 1fr 124 40 64 78）。
  Widget _lineRow(BuildContext context,
      {required Widget c1,
      required Widget c2,
      required Widget c3,
      required Widget c4,
      required Widget c5}) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Expanded(child: c1),
        const SizedBox(width: 8),
        SizedBox(width: 96, child: c2),
        const SizedBox(width: 8),
        SizedBox(width: 34, child: c3),
        const SizedBox(width: 8),
        SizedBox(width: 60, child: c4),
        const SizedBox(width: 8),
        SizedBox(width: 72, child: c5),
      ],
    );
  }
}

class _ActionGroup extends StatelessWidget {
  final DrawerActionGroup group;
  const _ActionGroup({required this.group});

  @override
  Widget build(BuildContext context) {
    final t = context.tokens;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(group.label,
            style: TextStyle(
                fontSize: AppDims.fsXs,
                color: t.muted,
                fontWeight: FontWeight.w600,
                letterSpacing: 0.4)),
        const SizedBox(height: 8),
        Wrap(spacing: 10, runSpacing: 10, children: group.buttons),
      ],
    );
  }
}