import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:bookatanker/supplier/todaysprice/custom_calendar.dart';

import '../../common/settings.dart';

// Contains date picker + filtered graph
class GraphScreen extends StatefulWidget {
  final int selectedType;

  const GraphScreen({super.key, required this.selectedType});

  @override
  State<GraphScreen> createState() => _GraphScreenState();
}

class _GraphScreenState extends State<GraphScreen> {
  List<Map<String, dynamic>> filteredDrinking = [];
  List<Map<String, dynamic>> filteredBore = [];

  DateTimeRange? selectedRange;

  @override
  void initState() {
    super.initState();
    _loadLastWeek(); // Load last week by default
  }

  void _loadLastWeek() {
    DateTime today = DateTime.now();
    DateTime lastWeek = today.subtract(const Duration(days: 7));
    debugPrint('$lastWeek');

    // Update selectedRange so the card shows last week
    selectedRange = DateTimeRange(start: lastWeek, end: today);

    _filterData(lastWeek, today);

    setState(() {}); // trigger rebuild
  }

  void _pickDateRange() async {
    final result = await showDialog<DateTimeRange>(
      context: context,
      builder: (context) => AdvancedDateRangePicker(
        initialRange: selectedRange,
      ),
    );

    if (result != null) {
      selectedRange = result;
      _filterData(result.start, result.end);
      setState(() {
        selectedRange = result;               // store this for showing in card above graph
      });
    }
  }

  void _filterData(DateTime start, DateTime end) {
    setState(() {
      filteredDrinking = weeklyPriceData["Drinking Water"]!
          .where((d) {
        DateTime date = DateTime.parse(d["date"]);
        return !date.isBefore(start) && !date.isAfter(end);
      }).toList();

      filteredBore = weeklyPriceData["bore Water"]!
          .where((d) {
        DateTime date = DateTime.parse(d["date"]);
        return !date.isBefore(start) && !date.isAfter(end);
      }).toList();
    });
  }

  void _openDateMenu() {
    showMenu(
      context: context,
      color: Colors.white,
      elevation: 6,        // smooth shadow
      position: const RelativeRect.fromLTRB(1000, 100, 10, 0), // position near icon
      items: [
        PopupMenuItem(
          value: "week",
          child: Text("Last Week",
            style: fontTextStyle(14, Colors.black, FontWeight.w500),
          ),
        ),
        PopupMenuItem(
          value: "month",
          child: Text("Last Month",
            style: fontTextStyle(14, Colors.black, FontWeight.w500),
          ),
        ),
        PopupMenuItem(
          value: "custom",
          child: Text("Custom Dates",
            style: fontTextStyle(14, Colors.black, FontWeight.w500),
          ),
        ),
      ],
    ).then((value) {
      if (value == null) return;
      if (value == "week") {
        DateTime today = DateTime.now();
        DateTime lastWeek = today.subtract(const Duration(days: 7));
        setState(() {
          selectedRange = DateTimeRange(start: lastWeek, end: today);
          _filterData(lastWeek, today);
        });
      }
      else if (value == "month") {
        DateTime today = DateTime.now();
        DateTime lastMonth = DateTime(today.year, today.month - 1, today.day);
        setState(() {
          selectedRange = DateTimeRange(start: lastMonth, end: today);
          _filterData(lastMonth, today);
        });
      }
      else if (value == "custom") {
        _pickDateRange();
      }
    });
  }

  // For showing date in card above graph
  String _formattedDateRange() {
    if (selectedRange == null) return "Select Date";

    final start = selectedRange!.start;
    final end = selectedRange!.end;

    const months = [
      "", "Jan", "Feb", "Mar", "Apr", "May", "Jun",
      "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
    ];

    if (start.month == end.month) {
      return "${start.day} – ${end.day} ${months[start.month]}";
    } else {
      return "${start.day} ${months[start.month]} – ${end.day} ${months[end.month]}";
    }
  }

  String _formattedAvgPrice() {
    List<Map<String, dynamic>> activeList =
    widget.selectedType == 0 ? filteredDrinking : filteredBore;

    debugPrint('$activeList');

    if (activeList.isEmpty) return "-";

    double total = 0;
    for (var item in activeList) {
      total += (item["price"] as num).toDouble();
    }

    double avg = total / activeList.length;
    return "${avg.toStringAsFixed(2)}";
  }



  @override
  Widget build(BuildContext context) {
    return Column(
      children: [

        // 🔥 TOP ROW (LEFT: BOX, RIGHT: CALENDAR)
        Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [

            // LEFT BOX
            Padding(
              padding: const EdgeInsets.only(top: 14, left: 10),
              child: Container(
                height: 100,
                width: 180,
                padding: const EdgeInsets.all(12),
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.circular(12),
                  boxShadow: [
                    BoxShadow(
                      color: Colors.black.withOpacity(0.15),
                      blurRadius: 8,
                      spreadRadius: 2,
                      offset: const Offset(2, 4),
                    ),
                  ],
                ),
                child: AnimatedSwitcher(
                  duration: const Duration(milliseconds: 350),
                  transitionBuilder: (child, animation) {
                    return FadeTransition(
                      opacity: animation,
                      child: SlideTransition(
                        position: Tween<Offset>(
                          begin: const Offset(0.2, 0),  // Soft slide from right
                          end: Offset.zero,
                        ).animate(animation),
                        child: child,
                      ),
                    );
                  },
                  child: Column(
                    key: ValueKey(widget.selectedType), // IMPORTANT 🔑
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        widget.selectedType == 0 ? "Drinking Water" : "Bore Water",
                        style: fontTextStyle(14, Colors.black, FontWeight.w600),
                      ),

                      const SizedBox(height: 4),

                      Text(
                        _formattedDateRange(),
                        style: fontTextStyle(14, Colors.grey.shade700, FontWeight.w500),
                      ),

                      const SizedBox(height: 4),

                      RichText(
                        text: TextSpan(
                          children: [
                            TextSpan(
                              text: "${_formattedAvgPrice()} ",
                              style: fontTextStyle(20, Colors.black, FontWeight.bold),
                            ),
                            TextSpan(
                              text: "/5000 L",
                              style: fontTextStyle(14, Colors.grey.shade600, FontWeight.w400),
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                ),
              ),
            ),

            // RIGHT CALENDAR BUTTON
            Padding(
              padding: const EdgeInsets.only(top: 4, right: 8),
              child: InkWell(
                onTap: () => _openDateMenu(),
                borderRadius: BorderRadius.circular(10),
                child: Container(
                  padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 8),
                  decoration: BoxDecoration(
                    color: Colors.white,
                    borderRadius: BorderRadius.circular(10),
                    border: Border.all(color: Colors.grey.shade300),
                    boxShadow: const [
                      BoxShadow(
                        color: Colors.black12,
                        blurRadius: 4,
                        offset: Offset(0, 2),
                      ),
                    ],
                  ),
                  child: Row(
                    children: const [
                      Icon(Icons.calendar_month, size: 28, color: Colors.blueAccent),
                      Icon(Icons.arrow_drop_down, size: 28, color: Colors.blueAccent),
                    ],
                  ),
                ),
              ),
            ),
          ],
        ),

        const SizedBox(height: 5),

        // Show graph only if data is available
        if (filteredDrinking.isNotEmpty || filteredBore.isNotEmpty)
          Expanded(
            child: SingleChildScrollView(
              scrollDirection: Axis.horizontal,
              padding: const EdgeInsets.symmetric(horizontal: 10),
              child: DoublePriceBarGraph(
                drinkingData: filteredDrinking,
                boreData: filteredBore,
              ),
            ),
          )
        else
          Padding(
            padding: EdgeInsets.all(30),
            child: Text("No data available for the selected dates",
              style: fontTextStyle(13, Colors.black87, FontWeight.w600),
            ),
          ),
      ],
    );
  }
}


Widget buildLegend() {
  return Row(
    mainAxisAlignment: MainAxisAlignment.center,
    children: [
      // Drinking Water Legend
      Row(
        children: [
          Container(
            width: 14,
            height: 14,
            decoration: BoxDecoration(
              color: Colors.blueAccent,
              borderRadius: BorderRadius.circular(4),
            ),
          ),
          const SizedBox(width: 6),

          Text(
            "Drinking Water",
            style: fontTextStyle(12, Colors.black87, FontWeight.w600),
          ),
        ],
      ),

      const SizedBox(width: 20),

      // Bore Water Legend
      Row(
        children: [
          Container(
            width: 14,
            height: 14,
            decoration: BoxDecoration(
              color: Colors.orangeAccent,
              borderRadius: BorderRadius.circular(4),
            ),
          ),
          const SizedBox(width: 6),

          Text(
            "Bore Water",
            style: fontTextStyle(12, Colors.black87, FontWeight.w600),
          ),
        ],
      ),
    ],
  );
}


class DoublePriceBarGraph extends StatelessWidget {
  final List<Map<String, dynamic>> drinkingData;
  final List<Map<String, dynamic>> boreData;

  const DoublePriceBarGraph({
    super.key,
    required this.drinkingData,
    required this.boreData,
  });

  @override
  Widget build(BuildContext context) {
    final drinkMap = {for (var d in drinkingData) d["date"]: d};
    final boreMap = {for (var b in boreData) b["date"]: b};

    final allDates = [...drinkMap.keys, ...boreMap.keys].toSet().toList()
      ..sort((a, b) =>
          DateTime.parse(a).compareTo(DateTime.parse(b))); // FIXED

    return Row(
        crossAxisAlignment: CrossAxisAlignment.end,
        children: allDates.map((date) {
          final d = drinkMap[date];
          final b = boreMap[date];

          double drinkPrice = d?["price"]?.toDouble() ?? 0.0;
          double borePrice = b?["price"]?.toDouble() ?? 0.0;

          String day = DateTime.parse(date).day.toString();

          return Padding(
            padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 5),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.end,
              children: [
                Row(
                  crossAxisAlignment: CrossAxisAlignment.end,
                  children: [
                    // Drinking
                    _buildBar(drinkPrice, Colors.blueAccent),

                    const SizedBox(width: 0),

                    // Bore
                    _buildBar(borePrice, Colors.orangeAccent)
                  ],
                ),
                const SizedBox(height: 6),
                Text(day, style: fontTextStyle(12, Colors.black87, FontWeight.w600)),
              ],
            ),
          );
        }).toList(),
    );
  }

  Widget _buildBar(double price, Color color) {
    return Column(
      children: [
        Text(
          "₹${price.toInt()}",
          style: fontTextStyle(9, color, FontWeight.bold),
        ),
        Container(
          width: 20,
          height: price / 15,  // Adjust scaling if bars too short
          decoration: BoxDecoration(
            color: color,
            borderRadius: BorderRadius.circular(5),
          ),
        ),
      ],
    );
  }
}





final Map<String, List<Map<String, dynamic>>> weeklyPriceData = {

  "Drinking Water": [
    {
      "date": "2025-11-01",
      "price": 1570,
      "minPrice": 1550,
      "maxPrice": 1650,
      "avgPrice": 1600
    },
    {
      "date": "2025-11-02",
      "price": 1590,
      "minPrice": 1560,
      "maxPrice": 1660,
      "avgPrice": 1610
    },
    {
      "date": "2025-11-03",
      "price": 1550,
      "minPrice": 1520,
      "maxPrice": 1600,
      "avgPrice": 1560
    },
    {
      "date": "2025-11-04",
      "price": 1610,
      "minPrice": 1580,
      "maxPrice": 1670,
      "avgPrice": 1620
    },
    {
      "date": "2025-11-05",
      "price": 1630,
      "minPrice": 1600,
      "maxPrice": 1700,
      "avgPrice": 1650
    },
    {
      "date": "2025-11-06",
      "price": 1580,
      "minPrice": 1550,
      "maxPrice": 1650,
      "avgPrice": 1600
    },
    {
      "date": "2025-11-07",
      "price": 1600,
      "minPrice": 1580,
      "maxPrice": 1670,
      "avgPrice": 1620
    },
    {
      "date": "2025-11-08",
      "price": 1640,
      "minPrice": 1600,
      "maxPrice": 1700,
      "avgPrice": 1650
    },
    {
      "date": "2025-11-09",
      "price": 1620,
      "minPrice": 1590,
      "maxPrice": 1680,
      "avgPrice": 1630
    },
    {
      "date": "2025-11-10",
      "price": 1575,
      "minPrice": 1550,
      "maxPrice": 1640,
      "avgPrice": 1600
    },

    {
      "date": "2025-11-11",
      "price": 1585,
      "minPrice": 1550,
      "maxPrice": 1650,
      "avgPrice": 1605
    },
    {
      "date": "2025-11-12",
      "price": 1615,
      "minPrice": 1580,
      "maxPrice": 1670,
      "avgPrice": 1625
    },
    {
      "date": "2025-11-13",
      "price": 1590,
      "minPrice": 1560,
      "maxPrice": 1650,
      "avgPrice": 1610
    },
    {
      "date": "2025-11-14",
      "price": 1645,
      "minPrice": 1610,
      "maxPrice": 1710,
      "avgPrice": 1660
    },
    {
      "date": "2025-11-15",
      "price": 1625,
      "minPrice": 1590,
      "maxPrice": 1680,
      "avgPrice": 1635
    },
    {
      "date": "2025-11-16",
      "price": 1580,
      "minPrice": 1550,
      "maxPrice": 1640,
      "avgPrice": 1595
    },
    {
      "date": "2025-11-17",
      "price": 1570,
      "minPrice": 1540,
      "maxPrice": 1630,
      "avgPrice": 1580
    },
    {
      "date": "2025-11-18",
      "price": 1600,
      "minPrice": 1580,
      "maxPrice": 1660,
      "avgPrice": 1620
    },
    {
      "date": "2025-11-19",
      "price": 1630,
      "minPrice": 1600,
      "maxPrice": 1690,
      "avgPrice": 1650
    },
    {
      "date": "2025-11-20",
      "price": 1650,
      "minPrice": 1610,
      "maxPrice": 1720,
      "avgPrice": 1670
    },

    {
      "date": "2025-11-21",
      "price": 1610,
      "minPrice": 1580,
      "maxPrice": 1670,
      "avgPrice": 1630
    },
    {
      "date": "2025-11-22",
      "price": 1590,
      "minPrice": 1560,
      "maxPrice": 1650,
      "avgPrice": 1605
    },
    {
      "date": "2025-11-23",
      "price": 1620,
      "minPrice": 1590,
      "maxPrice": 1680,
      "avgPrice": 1630
    },
    {
      "date": "2025-11-24",
      "price": 1670,
      "minPrice": 1630,
      "maxPrice": 1730,
      "avgPrice": 1680
    },
    {
      "date": "2025-11-25",
      "price": 1690,
      "minPrice": 1650,
      "maxPrice": 1750,
      "avgPrice": 1700
    },
    {
      "date": "2025-11-26",
      "price": 1580,
      "minPrice": 1550,
      "maxPrice": 1640,
      "avgPrice": 1600
    },
    {
      "date": "2025-11-27",
      "price": 1600,
      "minPrice": 1570,
      "maxPrice": 1670,
      "avgPrice": 1620
    },
    {
      "date": "2025-11-28",
      "price": 1615,
      "minPrice": 1580,
      "maxPrice": 1680,
      "avgPrice": 1630
    },
    {
      "date": "2025-11-29",
      "price": 1635,
      "minPrice": 1600,
      "maxPrice": 1700,
      "avgPrice": 1650
    },
    {
      "date": "2025-11-30",
      "price": 1605,
      "minPrice": 1580,
      "maxPrice": 1670,
      "avgPrice": 1620
    },
  ],

  "bore Water": [
    {
      "date": "2025-11-01",
      "price": 780,
      "minPrice": 760,
      "maxPrice": 810,
      "avgPrice": 790
    },
    {
      "date": "2025-11-02",
      "price": 800,
      "minPrice": 780,
      "maxPrice": 840,
      "avgPrice": 810
    },
    {
      "date": "2025-11-03",
      "price": 770,
      "minPrice": 750,
      "maxPrice": 800,
      "avgPrice": 780
    },
    {
      "date": "2025-11-04",
      "price": 820,
      "minPrice": 800,
      "maxPrice": 850,
      "avgPrice": 830
    },
    {
      "date": "2025-11-05",
      "price": 830,
      "minPrice": 810,
      "maxPrice": 860,
      "avgPrice": 840
    },
    {
      "date": "2025-11-06",
      "price": 785,
      "minPrice": 760,
      "maxPrice": 820,
      "avgPrice": 795
    },
    {
      "date": "2025-11-07",
      "price": 810,
      "minPrice": 790,
      "maxPrice": 840,
      "avgPrice": 820
    },
    {
      "date": "2025-11-08",
      "price": 825,
      "minPrice": 800,
      "maxPrice": 860,
      "avgPrice": 835
    },
    {
      "date": "2025-11-09",
      "price": 795,
      "minPrice": 770,
      "maxPrice": 830,
      "avgPrice": 810
    },
    {
      "date": "2025-11-10",
      "price": 820,
      "minPrice": 790,
      "maxPrice": 860,
      "avgPrice": 830
    },

    {
      "date": "2025-11-11",
      "price": 810,
      "minPrice": 780,
      "maxPrice": 850,
      "avgPrice": 820
    },
    {
      "date": "2025-11-12",
      "price": 830,
      "minPrice": 800,
      "maxPrice": 870,
      "avgPrice": 840
    },
    {
      "date": "2025-11-13",
      "price": 785,
      "minPrice": 770,
      "maxPrice": 820,
      "avgPrice": 795
    },
    {
      "date": "2025-11-14",
      "price": 750,
      "minPrice": 730,
      "maxPrice": 790,
      "avgPrice": 760
    },
    {
      "date": "2025-11-15",
      "price": 770,
      "minPrice": 750,
      "maxPrice": 810,
      "avgPrice": 780
    },
    {
      "date": "2025-11-16",
      "price": 825,
      "minPrice": 800,
      "maxPrice": 870,
      "avgPrice": 840
    },
    {
      "date": "2025-11-17",
      "price": 840,
      "minPrice": 820,
      "maxPrice": 880,
      "avgPrice": 850
    },
    {
      "date": "2025-11-18",
      "price": 810,
      "minPrice": 790,
      "maxPrice": 840,
      "avgPrice": 820
    },
    {
      "date": "2025-11-19",
      "price": 790,
      "minPrice": 770,
      "maxPrice": 830,
      "avgPrice": 800
    },
    {
      "date": "2025-11-20",
      "price": 830,
      "minPrice": 800,
      "maxPrice": 870,
      "avgPrice": 840
    },

    {
      "date": "2025-11-21",
      "price": 850,
      "minPrice": 820,
      "maxPrice": 890,
      "avgPrice": 860
    },
    {
      "date": "2025-11-22",
      "price": 780,
      "minPrice": 760,
      "maxPrice": 810,
      "avgPrice": 790
    },
    {
      "date": "2025-11-23",
      "price": 790,
      "minPrice": 770,
      "maxPrice": 820,
      "avgPrice": 800
    },
    {
      "date": "2025-11-24",
      "price": 835,
      "minPrice": 810,
      "maxPrice": 870,
      "avgPrice": 845
    },
    {
      "date": "2025-11-25",
      "price": 820,
      "minPrice": 800,
      "maxPrice": 860,
      "avgPrice": 830
    },
    {
      "date": "2025-11-26",
      "price": 760,
      "minPrice": 740,
      "maxPrice": 800,
      "avgPrice": 780
    },
    {
      "date": "2025-11-27",
      "price": 810,
      "minPrice": 780,
      "maxPrice": 850,
      "avgPrice": 820
    },
    {
      "date": "2025-11-28",
      "price": 795,
      "minPrice": 770,
      "maxPrice": 830,
      "avgPrice": 805
    },
    {
      "date": "2025-11-29",
      "price": 835,
      "minPrice": 810,
      "maxPrice": 870,
      "avgPrice": 845
    },
    {
      "date": "2025-11-30",
      "price": 820,
      "minPrice": 790,
      "maxPrice": 860,
      "avgPrice": 830
    },
  ]
};