import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:test_sa/extensions/context_extension.dart';
import 'package:test_sa/extensions/int_extensions.dart';
import 'package:test_sa/extensions/text_extensions.dart';
import 'package:test_sa/extensions/widget_extensions.dart';
import 'package:test_sa/modules/copilot/model/copilot_message_model.dart';
import 'package:test_sa/new_views/app_style/app_color.dart';
import 'package:test_sa/new_views/common_widgets/app_filled_button.dart';
import 'package:test_sa/new_views/common_widgets/default_app_bar.dart';
import 'package:test_sa/new_views/common_widgets/app_text_form_field.dart';
import 'package:test_sa/views/widgets/item_views/info_header_widget.dart';
import 'package:test_sa/views/widgets/item_views/info_text_widget.dart';

import '../controller/copilot_provider.dart';
import 'copilot_chat_page.dart' show CopilotChatPage;

class CopilotHistoryPage extends StatefulWidget {
  static const String routeName = "/copilot-history";

  const CopilotHistoryPage({Key? key}) : super(key: key);

  @override
  State<CopilotHistoryPage> createState() => _CopilotHistoryPageState();
}

class _CopilotHistoryPageState extends State<CopilotHistoryPage> {
  String _searchQuery = '';

  @override
  void initState() {
    super.initState();

    WidgetsBinding.instance.addPostFrameCallback((_) {
      context.read<CopilotProvider>().loadHistory();
    });
  }

  void _openConversation(String threadId) {
    Navigator.push(
      context,
      CupertinoPageRoute(
        builder: (_) => const CopilotChatPage(
          isNewConversation: false,
        ),
      ),
    ).then(
      (_) => context.read<CopilotProvider>().loadHistory(),
    );

    context.read<CopilotProvider>().loadConversation(threadId);
  }

  void _startNewConversation() {
    context.read<CopilotProvider>().startNewConversation();

    Navigator.push(
      context,
      CupertinoPageRoute(
        builder: (_) => const CopilotChatPage(
          isNewConversation: true,
        ),
      ),
    ).then(
      (_) => context.read<CopilotProvider>().loadHistory(),
    );
  }

  List<CopilotHistoryItem> _filteredHistory(
    List<CopilotHistoryItem> history,
  ) {
    final query = _searchQuery.trim().toLowerCase();

    if (query.isEmpty) {
      return history;
    }

    return history.where((item) {
      return item.firstHumanMessage.toLowerCase().contains(query);
    }).toList();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: DefaultAppBar(
        title: "Copilot History",
        actions: [
          IconButton(
            icon: const Icon(Icons.chat_bubble),
            onPressed: _startNewConversation,
          ),
        ],
      ),
      body: Consumer<CopilotProvider>(
        builder: (context, provider, _) {
          if (provider.historyLoading) {
            return const Center(
              child: CircularProgressIndicator(),
            );
          }

          if (provider.history.isEmpty) {
            return Column(
              mainAxisSize: MainAxisSize.min,
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                const Icon(
                  Icons.chat_bubble_outline,
                  size: 56,
                  color: AppColor.neutral120,
                ),
                16.height,
                Text(
                  "No conversations yet",
                  style: AppTextStyles.heading6.copyWith(
                    color: AppColor.neutral120,
                  ),
                ),
                24.height,
                AppFilledButton(
                  label: "Start a new conversation",
                  maxWidth: true,
                  buttonColor: AppColor.primary10,
                  onPressed: _startNewConversation,
                ).paddingOnly(
                  start: 48,
                  end: 48,
                ),
              ],
            ).center;
          }

          final filteredHistory = _filteredHistory(provider.history);

          return Column(
            children: [
              8.height,
              _buildSearchBar(context),
              8.height,
              if (filteredHistory.isEmpty)
                Expanded(
                  child: Column(
                    mainAxisSize: MainAxisSize.min,
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      const Icon(
                        Icons.search_off,
                        size: 48,
                        color: AppColor.neutral120,
                      ),
                      12.height,
                      Text(
                        "No conversations found",
                        style: AppTextStyles.heading6.copyWith(
                          color: AppColor.neutral120,
                        ),
                      ),
                    ],
                  ).center,
                )
              else
                Expanded(
                  child: ListView.separated(
                    padding: const EdgeInsets.symmetric(
                      horizontal: 16,
                    ),
                    itemCount: filteredHistory.length,
                    separatorBuilder: (context, index) => 12.height,
                    itemBuilder: (context, index) {
                      final item = filteredHistory[index];

                      return messageHistoryCard(
                        item: item,
                        provider: provider,
                      );
                    },
                  ),
                ),
            ],
          );
        },
      ),
    );
  }

  Widget _buildSearchBar(BuildContext context) {
    return AppTextFormField(
      labelText: "",
      hintText: context.translation.search,
      showBorder: false,
      showShadow: false,
      // backgroundColor: AppColor.fieldBgColor(context),
      prefixIcon: Icon(
        Icons.search,
        color: context.isDark ? AppColor.neutral10 : AppColor.neutral20,
        size: 19,
      ),
      textInputType: TextInputType.text,
      contentPadding: EdgeInsets.zero,
      hintStyle: AppTextStyles.bodyText.copyWith(
        color: context.isDark ? AppColor.neutral10 : AppColor.neutral20,
      ),
      style: AppTextStyles.bodyText.copyWith(
        color: AppColor.textStyleColor(context),
      ),
      onChange: (value) {
        setState(() {
          _searchQuery = value;
        });
      },
    )
        .toShadowContainer(
          context,
          showShadow: false,
        )
        .paddingOnly(start: 16, end: 16);
  }

  Widget messageHistoryCard({
    required CopilotHistoryItem item,
    required CopilotProvider provider,
  }) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: [
        Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Icon(
              Icons.chat_bubble,
              color: AppColor.icon2Color(context),
            ),
            16.width,
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                InfoHeaderWidget(
                  item.firstHumanMessage,
                ),
                4.height,
                InfoTextLabelWidget(
                  label: _formatDate(item.updatedAt),
                ),
              ],
            ),
          ],
        ),
        "delete_icon"
            .toSvgAsset(
              height: 20,
              width: 20,
            )
            .onPress(
              () => provider.deleteHistory(item.threadId),
            ),
      ],
    )
        .toShadowContainer(
      context,
      showShadow: false,
    )
        .onPress(() {
      _openConversation(item.threadId);
    });
  }

  String _formatDate(DateTime date) {
    return "${date.day.toString().padLeft(2, '0')}/"
        "${date.month.toString().padLeft(2, '0')}/"
        "${date.year} "
        "${date.hour.toString().padLeft(2, '0')}:"
        "${date.minute.toString().padLeft(2, '0')}";
  }
}