import 'package:ducafe_ui_core/ducafe_ui_core.dart';
import 'package:flutter/material.dart';
import 'package:forui/forui.dart';
import 'package:get/get.dart';

import 'package:pj_supermarket_cloud/common/index.dart';

import 'controller.dart';
import 'widgets/startup_step_card.dart';

class LoadPage extends GetView<LoadController> {
  const LoadPage({super.key});

  @override
  Widget build(BuildContext context) {
    final theme = FTheme.of(context);
    return ColoredBox(
      color: XfjDesignTokens.canvas,
      child: SafeArea(
        child: Padding(
          padding: EdgeInsets.fromLTRB(28.w, 24.h, 28.w, 16.h),
          child: Column(
            children: [
              _buildHeader(theme),
              SizedBox(height: 16.h),
              Center(
                child: TerminalSurface(
                  width: 1260.w,
                  height: 820.h,
                  clipBehavior: Clip.hardEdge,
                  child: Row(
                    children: [
                      _StartupEnvironmentPanel(controller: controller),
                      _StartupProgressPanel(controller: controller).expanded(),
                    ],
                  ),
                ),
              ).expanded(),
              SizedBox(height: 10.h),
              _StartupFooter(controller: controller),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildHeader(FThemeData theme) {
    return SizedBox(
      height: 58.h,
      child: Row(
        children: [
          Padding(
            padding: EdgeInsets.fromLTRB(4.w, 4.h, 8.w, 4.h),
            child: Text(
              'ZAX',
              style: TextStyle(
                color: const Color(0xFF0865E8),
                fontSize: 38.w,
                height: 1.1,
                fontWeight: FontWeight.w900,
                letterSpacing: 0.4,
              ),
            ),
          ),
          SizedBox(width: 20.w),
          Container(width: 1, height: 34.h, color: XfjDesignTokens.line),
          SizedBox(width: 20.w),
          Text(
            '智慧消费终端',
            style: theme.typography.xl.copyWith(
              color: XfjDesignTokens.ink,
              fontWeight: FontWeight.w700,
            ),
          ),
          const Spacer(),
          Obx(
            () => _HeaderStatus(
              label: controller.appControl.startupStatusLabel.value,
              status: _overallStatus(controller),
            ),
          ),
        ],
      ),
    );
  }
}

class _StartupEnvironmentPanel extends StatelessWidget {
  const _StartupEnvironmentPanel({required this.controller});

  final LoadController controller;

  @override
  Widget build(BuildContext context) {
    final theme = FTheme.of(context);
    return Container(
      width: 460.w,
      padding: EdgeInsets.all(34.w),
      decoration: const BoxDecoration(
        color: XfjDesignTokens.primarySoft,
        border: Border(right: BorderSide(color: XfjDesignTokens.line)),
      ),
      child: Obx(() {
        final status = _environmentStatus(controller);
        final color = _statusColor(status);
        return Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            _EnvironmentPill(
              label: _environmentPillLabel(status),
              status: status,
            ),
            const Spacer(),
            Center(child: _EnvironmentIndicator(status: status)),
            const Spacer(),
            Container(
              width: double.infinity,
              padding: EdgeInsets.all(22.w),
              decoration: BoxDecoration(
                color: Colors.white.withValues(alpha: 0.82),
                border: Border.all(
                  color: color.withValues(alpha: 0.22),
                ),
                borderRadius: BorderRadius.circular(
                  XfjDesignTokens.cardRadius,
                ),
              ),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Row(
                    children: [
                      FIcon(
                        _environmentIcon(controller, status),
                        size: 24.w,
                        color: color,
                      ),
                      SizedBox(width: 12.w),
                      Text(
                        controller
                            .appControl.startupEnvironmentDescription.value,
                        style: theme.typography.lg.copyWith(
                          color: color,
                          fontWeight: FontWeight.w700,
                        ),
                      ).expanded(),
                    ],
                  ),
                  SizedBox(height: 12.h),
                  Text(
                    controller.appControl.startupEnvironmentDetail.value,
                    style: theme.typography.base.copyWith(
                      color: XfjDesignTokens.muted,
                      height: 1.55,
                    ),
                  ),
                ],
              ),
            ),
          ],
        );
      }),
    );
  }
}

class _StartupProgressPanel extends StatelessWidget {
  const _StartupProgressPanel({required this.controller});

  final LoadController controller;

  @override
  Widget build(BuildContext context) {
    final theme = FTheme.of(context);
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 40.w, vertical: 28.h),
      child: Obx(() {
        final failureMessage =
            controller.appControl.startupFailureMessage.value;
        return Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      failureMessage.isEmpty ? '正在准备收银工作台' : '终端启动未完成',
                      style: theme.typography.xl3.copyWith(
                        color: XfjDesignTokens.ink,
                        fontWeight: FontWeight.w800,
                      ),
                    ),
                    SizedBox(height: 8.h),
                    Text(
                      failureMessage.isEmpty
                          ? '系统正在按实际执行结果准备本地数据与设备服务，完成后将自动进入登录页面。'
                          : failureMessage,
                      style: theme.typography.base.copyWith(
                        color: XfjDesignTokens.muted,
                        height: 1.5,
                      ),
                    ),
                  ],
                ).expanded(),
                SizedBox(width: 24.w),
                _ProgressCount(
                  current: controller.completedCount,
                  total: controller.startupSteps.length,
                  failed: failureMessage.isNotEmpty,
                ),
              ],
            ),
            SizedBox(height: 18.h),
            ClipRRect(
              borderRadius: BorderRadius.circular(999),
              child: LinearProgressIndicator(
                value: controller.progress,
                minHeight: 8.h,
                color: failureMessage.isEmpty
                    ? XfjDesignTokens.primary
                    : XfjDesignTokens.danger,
                backgroundColor: const Color(0xFFEDEFF3),
              ),
            ),
            SizedBox(height: 18.h),
            ListView.separated(
              primary: false,
              padding: EdgeInsets.zero,
              physics: const ClampingScrollPhysics(),
              itemCount: controller.startupSteps.length,
              separatorBuilder: (_, __) => SizedBox(height: 8.h),
              itemBuilder: (_, index) {
                final item = controller.startupSteps[index];
                return StartupStepCard(
                  icon: _stepIconAt(index),
                  state: item,
                );
              },
            ).expanded(),
            SizedBox(height: 12.h),
            _StartupNotice(
              failed: failureMessage.isNotEmpty,
              onRetry: controller.retry,
            ),
          ],
        );
      }),
    );
  }
}

class _StartupNotice extends StatelessWidget {
  const _StartupNotice({required this.failed, required this.onRetry});

  final bool failed;
  final Future<void> Function() onRetry;

  @override
  Widget build(BuildContext context) {
    final theme = FTheme.of(context);
    return Container(
      constraints: BoxConstraints(minHeight: 56.h),
      padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 4.h),
      decoration: BoxDecoration(
        color: failed ? const Color(0xFFFFF3F2) : const Color(0xFFFAFBFC),
        border: Border.all(
          color: failed
              ? XfjDesignTokens.danger.withValues(alpha: 0.28)
              : XfjDesignTokens.line,
        ),
        borderRadius: BorderRadius.circular(XfjDesignTokens.controlRadius),
      ),
      child: Row(
        children: [
          FIcon(
            failed ? FAssets.icons.circleAlert : FAssets.icons.shieldCheck,
            size: 20.w,
            color: failed ? XfjDesignTokens.danger : XfjDesignTokens.success,
          ),
          SizedBox(width: 10.w),
          Text(
            failed
                ? '可重试初始化；如果仍失败，请检查本地数据库、权限和设备配置。'
                : '启动过程按真实服务状态自动完成，请勿关闭应用或断开设备电源。',
            style: theme.typography.sm.copyWith(
              color: XfjDesignTokens.muted,
            ),
          ).expanded(),
          SizedBox(width: 12.w),
          if (failed)
            FButton(
              style: FButtonStyle.outline,
              label: const Text('重新检查'),
              onPress: () => onRetry(),
            ).height(48.h)
          else
            Text(
              '版本 1.1.1',
              style: theme.typography.sm.copyWith(
                color: XfjDesignTokens.muted,
                fontWeight: FontWeight.w600,
              ),
            ),
        ],
      ),
    );
  }
}

class _EnvironmentIndicator extends StatelessWidget {
  const _EnvironmentIndicator({required this.status});

  final AppStartupStepStatus status;

  @override
  Widget build(BuildContext context) {
    final color = _statusColor(status);
    return SizedBox(
      width: 270.w,
      height: 270.w,
      child: Stack(
        alignment: Alignment.center,
        children: [
          Container(
            width: 250.w,
            height: 250.w,
            decoration: BoxDecoration(
              shape: BoxShape.circle,
              color: Colors.white.withValues(alpha: 0.44),
              border: Border.all(color: color.withValues(alpha: 0.08)),
            ),
          ),
          SizedBox(
            width: 224.w,
            height: 224.w,
            child: CircularProgressIndicator(
              value: status == AppStartupStepStatus.failure ? 1 : null,
              strokeWidth: 4.w,
              color: color,
              backgroundColor: color.withValues(alpha: 0.12),
            ),
          ),
          Container(
            width: 154.w,
            height: 154.w,
            decoration: BoxDecoration(
              color: Colors.white,
              shape: BoxShape.circle,
              border: Border.all(color: color.withValues(alpha: 0.16)),
              boxShadow: [
                BoxShadow(
                  color: color.withValues(alpha: 0.12),
                  blurRadius: 36,
                  offset: const Offset(0, 14),
                ),
              ],
            ),
            child: FIcon(
              status == AppStartupStepStatus.failure
                  ? FAssets.icons.circleAlert
                  : FAssets.icons.monitor,
              size: 72.w,
              color: color,
            ),
          ),
        ],
      ),
    );
  }
}

class _EnvironmentPill extends StatelessWidget {
  const _EnvironmentPill({required this.label, required this.status});

  final String label;
  final AppStartupStepStatus status;

  @override
  Widget build(BuildContext context) {
    final theme = FTheme.of(context);
    final color = _statusColor(status);
    return Container(
      padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 10.h),
      decoration: BoxDecoration(
        color: Colors.white.withValues(alpha: 0.88),
        border: Border.all(color: color.withValues(alpha: 0.25)),
        borderRadius: BorderRadius.circular(999),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          FIcon(
            status == AppStartupStepStatus.failure
                ? FAssets.icons.circleAlert
                : status == AppStartupStepStatus.running
                    ? FAssets.icons.refreshCw
                    : FAssets.icons.check,
            size: 19.w,
            color: color,
          ),
          SizedBox(width: 8.w),
          Text(
            label,
            style: theme.typography.sm.copyWith(
              color: color,
              fontWeight: FontWeight.w700,
            ),
          ),
        ],
      ),
    );
  }
}

class _HeaderStatus extends StatelessWidget {
  const _HeaderStatus({required this.label, required this.status});

  final String label;
  final AppStartupStepStatus status;

  @override
  Widget build(BuildContext context) {
    final theme = FTheme.of(context);
    final color = _statusColor(status);
    return Container(
      height: 40.h,
      padding: EdgeInsets.symmetric(horizontal: 16.w),
      decoration: BoxDecoration(
        color: color.withValues(alpha: 0.08),
        border: Border.all(color: color.withValues(alpha: 0.24)),
        borderRadius: BorderRadius.circular(999),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Container(
            width: 8.w,
            height: 8.w,
            decoration: BoxDecoration(color: color, shape: BoxShape.circle),
          ),
          SizedBox(width: 8.w),
          Text(
            label,
            style: theme.typography.sm.copyWith(
              color: color,
              fontWeight: FontWeight.w700,
            ),
          ),
        ],
      ),
    );
  }
}

class _ProgressCount extends StatelessWidget {
  const _ProgressCount({
    required this.current,
    required this.total,
    required this.failed,
  });

  final int current;
  final int total;
  final bool failed;

  @override
  Widget build(BuildContext context) {
    final theme = FTheme.of(context);
    return Container(
      constraints: BoxConstraints(minWidth: 72.w, minHeight: 54.h),
      padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 10.h),
      decoration: BoxDecoration(
        color: failed ? const Color(0xFFFFF3F2) : XfjDesignTokens.control,
        borderRadius: BorderRadius.circular(999),
      ),
      child: Center(
        child: Text(
          '$current / $total',
          style: theme.typography.sm.copyWith(
            color: failed ? XfjDesignTokens.danger : XfjDesignTokens.muted,
            fontWeight: FontWeight.w700,
            fontFeatures: const [FontFeature.tabularFigures()],
          ),
        ),
      ),
    );
  }
}

class _StartupFooter extends StatelessWidget {
  const _StartupFooter({required this.controller});

  final LoadController controller;

  @override
  Widget build(BuildContext context) {
    final theme = FTheme.of(context);
    return Obx(() {
      final status = _overallStatus(controller);
      final color = _statusColor(status);
      return SizedBox(
        height: 32.h,
        child: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Container(
              width: 8.w,
              height: 8.w,
              decoration: BoxDecoration(color: color, shape: BoxShape.circle),
            ),
            SizedBox(width: 8.w),
            Text(
              _footerLabel(controller),
              style: theme.typography.sm.copyWith(
                color: XfjDesignTokens.muted,
              ),
            ),
          ],
        ),
      );
    });
  }
}

/// Load 页启动步骤图标映射，顺序与 [AppControl.startupSteps] 保持一致。
final _stepIcons = <SvgAsset>[
  FAssets.icons.hardDrive,
  FAssets.icons.database,
  FAssets.icons.printer,
  FAssets.icons.scanFace,
];

/// 按启动步骤索引取得图标；后续增加步骤但遗漏映射时使用通用设置图标避免页面越界崩溃。
SvgAsset _stepIconAt(int index) {
  if (index >= 0 && index < _stepIcons.length) return _stepIcons[index];
  return FAssets.icons.settings;
}

AppStartupStepStatus _overallStatus(LoadController controller) {
  if (controller.appControl.startupFailureMessage.value.isNotEmpty) {
    return AppStartupStepStatus.failure;
  }
  if (controller.appControl.startupFinished.value) {
    return controller.startupSteps
            .any((item) => item.status == AppStartupStepStatus.warning)
        ? AppStartupStepStatus.warning
        : AppStartupStepStatus.success;
  }
  return AppStartupStepStatus.running;
}

Color _statusColor(AppStartupStepStatus status) {
  return switch (status) {
    AppStartupStepStatus.running => XfjDesignTokens.primary,
    AppStartupStepStatus.success => XfjDesignTokens.success,
    AppStartupStepStatus.warning => XfjDesignTokens.warning,
    AppStartupStepStatus.failure => XfjDesignTokens.danger,
    AppStartupStepStatus.waiting => XfjDesignTokens.muted,
  };
}

AppStartupStepStatus _environmentStatus(LoadController controller) {
  return controller.startupSteps.isEmpty
      ? AppStartupStepStatus.waiting
      : controller.startupSteps.first.status;
}

String _environmentPillLabel(AppStartupStepStatus status) {
  return switch (status) {
    AppStartupStepStatus.running => '正在检测运行环境',
    AppStartupStepStatus.success => '运行环境检查完成',
    AppStartupStepStatus.warning => '运行环境受限可用',
    AppStartupStepStatus.failure => '运行环境检查失败',
    AppStartupStepStatus.waiting => '等待环境检查',
  };
}

SvgAsset _environmentIcon(
  LoadController controller,
  AppStartupStepStatus status,
) {
  if (status == AppStartupStepStatus.failure) {
    return FAssets.icons.circleAlert;
  }
  if (AppRuntimeTool.isEmulator || AppRuntimeTool.useManualHardwareInput) {
    return FAssets.icons.keyboard;
  }
  return FAssets.icons.monitor;
}

String _footerLabel(LoadController controller) {
  if (controller.appControl.startupFailureMessage.value.isNotEmpty) {
    return 'ZAX 智慧消费终端 · 本地服务启动失败';
  }
  if (controller.appControl.startupFinished.value) {
    return 'ZAX 智慧消费终端 · 本地服务运行中';
  }
  return 'ZAX 智慧消费终端 · 正在启动本地服务';
}