import { saveAs } from "file-saver";
import jalaali from "jalaali-js";
import {
  Calendar,
  ChevronLeft,
  FileChartColumnIncreasing,
  Menu,
  PanelLeft,
  Server,
  User,
} from "lucide-react";
import React, { useEffect, useRef, useState } from "react";
import { useLocation } from "react-router";
import XLSX from "xlsx-js-style";
import { Button } from "~/components/ui/button";
import { Calendar as CustomCalendar } from "~/components/ui/Calendar";
import { useAuth } from "~/contexts/auth-context";
import apiService from "~/lib/api";
import { cn, EventBus, handleDataValue } from "~/lib/utils";

interface HeaderProps {
  onToggleSidebar?: () => void;
  className?: string;
  title?: string;
  titleIcon?: React.ComponentType<{ className?: string }> | null;
}

interface MonthItem {
  id: string;
  label: string;
  start: string;
  end: string;
}

interface CurrentDay {
  start?: string;
  end?: string;
  sinceMonth?: string;
  fromMonth?: string;
}

interface SelectedDate {
  since?: number;
  until?: number;
}

const monthList: Array<MonthItem> = [
  {
    id: "month-1",
    label: "بهار",
    start: "01/01",
    end: "03/31",
  },
  {
    id: "month-2",
    label: "تابستان",
    start: "04/01",
    end: "06/31",
  },
  {
    id: "month-3",
    label: "پاییز",
    start: "07/01",
    end: "09/31",
  },
  {
    id: "month-4",
    label: "زمستان",
    start: "10/01",
    end: "12/30",
  },
];

const columns: Array<any> = [
  { key: "title", label: "عنوان پروژه", sortable: true, width: "300px" },
  {
    key: "importance_project",
    label: "میزان اهمیت",
    sortable: true,
    width: "160px",
  },
  {
    key: "strategic_theme",
    label: "مضمون راهبردی",
    sortable: true,
    width: "200px",
  },
  {
    key: "value_technology_and_innovation",
    label: "ارزش فناوری و نوآوری",
    sortable: true,
    width: "220px",
  },
  {
    key: "type_of_innovation",
    label: "انواع نوآوری",
    sortable: true,
    width: "160px",
  },
  {
    key: "innovation",
    label: "میزان نوآوری",
    sortable: true,
    width: "140px",
  },
  {
    key: "person_executing",
    label: "مسئول اجرا",
    sortable: true,
    width: "180px",
  },
  {
    key: "excellent_observer",
    label: "ناطر عالی",
    sortable: true,
    width: "180px",
  },
  { key: "observer", label: "ناظر پروژه", sortable: true, width: "180px" },
  { key: "moderator", label: "مجری", sortable: true, width: "180px" },
  {
    key: "executive_phase",
    label: "فاز اجرایی",
    sortable: true,
    width: "160px",
  },
  {
    key: "start_date",
    label: "تاریخ شروع",
    sortable: true,
    width: "120px",
  },
  {
    key: "remaining_time",
    label: "زمان باقی مانده",
    sortable: true,
    width: "140px",
    computed: true,
  },
  {
    key: "end_date",
    label: "تاریخ پایان (برنامه‌ریزی)",
    sortable: true,
    width: "160px",
  },
  {
    key: "renewed_duration",
    label: "مدت زمان تمدید",
    sortable: true,
    width: "140px",
  },
  {
    key: "done_date",
    label: "تاریخ پایان (واقعی)",
    sortable: true,
    width: "160px",
  },
  {
    key: "deviation_from_program",
    label: "متوسط انحراف برنامه‌ای",
    sortable: true,
    width: "160px",
  },
  {
    key: "approved_budget",
    label: "بودجه مصوب",
    sortable: true,
    width: "150px",
  },
  {
    key: "budget_spent",
    label: "بودجه صرف شده",
    sortable: true,
    width: "150px",
  },
  {
    key: "cost_deviation",
    label: "متوسط انحراف هزینه‌ای",
    sortable: true,
    width: "160px",
  },
];

export function Header({
  onToggleSidebar,
  className,
  title = "صفحه اول",
  titleIcon,
}: HeaderProps) {
  const { user } = useAuth();
  const { jy } = jalaali.toJalaali(new Date());

  const calendarRef = useRef<HTMLDivElement>(null);
  const [isProfileMenuOpen, setIsProfileMenuOpen] = useState<boolean>(false);
  const [isNotificationOpen, setIsNotificationOpen] = useState<boolean>(false);
  const [openCalendar, setOpenCalendar] = useState<boolean>(false);
  const [excelLoading, setExcelLoading] = useState<boolean>(false);
  const location = useLocation();
  const projectManagerRoute = "/dashboard/project-management";
  const [currentYear, setCurrentYear] = useState<SelectedDate>({
    since: jy,
    until: jy,
  });

  const [selectedDate, setSelectedDate] = useState<CurrentDay>({});

  useEffect(() => {
    const storedDate = localStorage.getItem("dateSelected");
    if (storedDate) {
      const parsedDate = JSON.parse(storedDate);
      setSelectedDate(parsedDate);

      const sinceYear = parsedDate.start
        ? parseInt(parsedDate.start.split("/")[0], 10)
        : jy;
      const untilYear = parsedDate.end
        ? parseInt(parsedDate.end.split("/")[0], 10)
        : jy;

      setCurrentYear({ since: sinceYear, until: untilYear });
    } else {
      const defaultDate = {
        sinceMonth: "بهار",
        fromMonth: "زمستان",
        start: `${jy}/01/01`,
        end: `${jy}/12/30`,
      };
      setSelectedDate(defaultDate);
      localStorage.setItem("dateSelected", JSON.stringify(defaultDate));
      setCurrentYear({ since: jy, until: jy });
    }
  }, []);

  const redirectHandler = async () => {
    try {
      const getData = await apiService.post("/GenerateSsoCode");
      const url = `https://inogen-bpms.pelekan.org/redirect/${getData.data}`;
      window.open(url, "_blank");
    } catch (error) {
      console.log(error);
    }
  };

  const changeSinceYear = (delta: number) => {
    if (!currentYear) return;

    const newSince = (currentYear.since ?? 0) + delta;

    if (newSince > (currentYear.until ?? Infinity) || newSince < 0) return;

    const updatedYear = { ...currentYear, since: newSince };
    setCurrentYear(updatedYear);

    const updatedDate = {
      ...selectedDate,
      start: `${newSince}/${selectedDate.start?.split("/").slice(1).join("/")}`,
    };
    setSelectedDate(updatedDate);
    localStorage.setItem("dateSelected", JSON.stringify(updatedDate));
    EventBus.emit("dateSelected", updatedDate);
  };

  const nextFromYearHandler = () => changeSinceYear(1);
  const prevFromYearHandler = () => changeSinceYear(-1);

  const selectFromDateHandler = (val: MonthItem) => {
    const data = {
      ...selectedDate,
      start: `${currentYear.since}/${val.start}`,
      sinceMonth: val.label,
    };
    setSelectedDate(data);
    localStorage.setItem("dateSelected", JSON.stringify(data));
    EventBus.emit("dateSelected", data);
  };

  const changeUntilYear = (delta: number) => {
    if (!currentYear) return;

    const newUntil = (currentYear.until ?? 0) + delta;

    if (newUntil < (currentYear.since ?? 0)) return;

    const updatedYear = { ...currentYear, until: newUntil };
    setCurrentYear(updatedYear);

    const updatedDate = {
      ...selectedDate,
      end: `${newUntil}/${selectedDate.end?.split("/").slice(1).join("/")}`,
    };
    setSelectedDate(updatedDate);
    localStorage.setItem("dateSelected", JSON.stringify(updatedDate));
    EventBus.emit("dateSelected", updatedDate);
  };

  const nextUntilYearHandler = () => changeUntilYear(1);
  const prevUntilYearHandler = () => changeUntilYear(-1);

  const selectUntilDateHandler = (val: MonthItem) => {
    const data = {
      ...selectedDate,
      end: `${currentYear.until}/${val.end}`,
      fromMonth: val.label,
    };
    setSelectedDate(data);
    localStorage.setItem("dateSelected", JSON.stringify(data));
    EventBus.emit("dateSelected", data);
    toggleCalendar();
  };

  const toggleCalendar = () => {
    setOpenCalendar(!openCalendar);
  };

  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (
        calendarRef.current &&
        !calendarRef.current.contains(event.target as Node)
      ) {
        setOpenCalendar(false);
      }
    };
    document.addEventListener("mousedown", handleClickOutside);
    return () => {
      document.removeEventListener("mousedown", handleClickOutside);
    };
  }, []);

  const exportToExcel = async () => {
    let arr = [];
    const data: any = await fetchExcelData();
    for (let i = 0; i < data.length; i++) {
      let obj: Record<string, any> = {};
      const project = data[i];

      Object.entries(project).forEach(([pKey, pValue]: [any, any]) => {
        Object.values(columns).forEach((col) => {
          if (pKey === col?.key) {
            ``;
            obj[col?.label] = handleDataValue(
              pValue?.includes(",") ? pValue.replaceAll(",", "") : pValue
            );
          }
        });
      });

      arr.push(obj);
    }

    const worksheet = XLSX.utils.json_to_sheet(arr);

    const workbook = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(workbook, worksheet, "People");

    const excelBuffer = XLSX.write(workbook, {
      bookType: "xlsx",
      type: "array",
    });

    const blob = new Blob([excelBuffer], {
      type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
    });
    saveAs(blob, "reports.xls");
  };

  const fetchExcelData = async () => {
    setExcelLoading(true);
    const fetchableColumns = columns.filter((c) => !c.computed);
    const outputFields = fetchableColumns.map((c) => c.apiField ?? c.key);

    const response = await apiService.select({
      ProcessName: "project",
      OutputFields: outputFields,
      Conditions: [
        ["start_date", ">=", selectedDate?.start || null, "and"],
        ["start_date", "<=", selectedDate?.end || null],
      ],
    });
    const parsedData = JSON.parse(response.data);
    setExcelLoading(false);
    return parsedData;
  };

  const handleDownloadFile = () => {
    if (excelLoading) return null;
    else exportToExcel();
  };

  return (
    <header
      className={cn(
        "backdrop-blur-sm border-b border-gray-400/30 h-16 flex items-center justify-between px-4 lg:px-6 shadow-sm relative z-30",
        className
      )}
    >
      {/* Left Section */}
      <div className="flex items-center gap-4">
        {/* Mobile Menu Toggle */}
        {onToggleSidebar && (
          <Button
            variant="ghost"
            size="sm"
            onClick={onToggleSidebar}
            className="lg:hidden"
          >
            <Menu className="h-5 w-5" />
          </Button>
        )}

        {/* Page Title */}
        <h1 className="text-xl flex items-center justify-center gap-4 font-bold text-white font-persian">
          {/* Right-side icon for current page */}
          {titleIcon ? (
            <div className="flex items-center gap-2 mr-4">
              {React.createElement(titleIcon, { className: "w-5 h-5 " })}
            </div>
          ) : (
            <PanelLeft />
          )}
          {title.includes("-") ? (
            <div className="flex row  items-center gap-4">
              <div className="flex items-center gap-1">
                {title.split("-")[0]}
                <ChevronLeft className="inline-block w-4 h-4" />
                {title.split("-")[1]}
              </div>
            </div>
          ) : (
            title
          )}
        </h1>

        <div ref={calendarRef} className="flex flex-col gap-3 relative">
          <div
            onClick={toggleCalendar}
            className="flex flex-row w-full gap-2 items-center border border-pr-gray p-1.5 rounded-md px-2.5 min-w-64 cursor-pointer hover:bg-pr-gray/50 transition-all duration-300"
          >
            <Calendar size={20} />
            {selectedDate ? (
              <div className="flex flex-row justify-between w-full min-w-36 font-bold gap-1">
                <div className="flex flex-row gap-1.5 w-max">
                  <span className="text-md">از</span>
                  <span className="text-md">{selectedDate?.sinceMonth}</span>
                  <span className="text-md">
                    {handleDataValue(currentYear.since)}
                  </span>
                </div>
                <div className="flex flex-row gap-1.5 w-max">
                  <span className="text-md">تا</span>
                  <span className="text-md">{selectedDate?.fromMonth}</span>
                  <span className="text-md">
                    {handleDataValue(currentYear.until)}
                  </span>
                </div>
              </div>
            ) : (
              "تاریخ مورد نظر خود را انتخاب نمایید"
            )}
          </div>

          {openCalendar && (
            <div className="flex flex-row gap-2.5 absolute top-14 right-[-40px] p-2.5 !pt-3.5 w-80 rounded-3xl overflow-hidden bg-pr-gray border-2 border-[#5F6284]">
              <CustomCalendar
                title="از"
                nextYearHandler={prevFromYearHandler}
                prevYearHandler={nextFromYearHandler}
                currentYear={handleDataValue(currentYear?.since)}
                monthList={monthList}
                selectedDate={selectedDate?.sinceMonth}
                selectDateHandler={selectFromDateHandler}
              />
              <span className="w-0.5 h-[12.5rem] border border-[#5F6284] block "></span>
              <CustomCalendar
                title="تا"
                nextYearHandler={prevUntilYearHandler}
                prevYearHandler={nextUntilYearHandler}
                currentYear={handleDataValue(currentYear?.until)}
                monthList={monthList}
                selectedDate={selectedDate?.fromMonth}
                selectDateHandler={selectUntilDateHandler}
              />
            </div>
          )}
        </div>
      </div>

      {/* Right Section */}
      <div className="flex items-center gap-2">
        {/* User Menu */}
        <div className="relative">
          <div className="flex items-center gap-2">
            {location.pathname === projectManagerRoute ? (
              <div className="flex justify-end w-full mb-0 pl-2">
                <span
                  className={`flex w-full cursor-pointer items-center gap-2 px-3 py-2 text-sm text-gray-300 hover:bg-gradient-to-r hover:from-emerald-500/10 hover:to-teal-500/10 hover:text-emerald-300 font-persian ${excelLoading ? "!cursor-not-allowed !opacity-10" : ""}`}
                  onClick={handleDownloadFile}
                >
                  <FileChartColumnIncreasing className="h-4 w-4" />
                  دانلود فایل اکسل
                </span>
              </div>
            ) : (
              ""
            )}

            {user?.id === 2041 && (
              <button
                className="flex w-full  cursor-pointer items-center gap-2 px-3 py-2 text-sm text-gray-300 hover:bg-gradient-to-r hover:from-emerald-500/10 hover:to-teal-500/10 hover:text-emerald-300 font-persian"
                onClick={redirectHandler}
              >
                <Server className="h-4 w-4" />
                ورود به میزکار مدیریت
              </button>
            )}

            <Button
              variant="ghost"
              size="sm"
              onClick={() => setIsProfileMenuOpen(!isProfileMenuOpen)}
              className="flex items-center gap-2 text-gray-300"
            >
              <div className="hidden sm:block text-right">
                <div className="text-sm font-medium font-persian">
                  {user?.name} {user?.family}
                </div>
                <div className="text-xs text-gray-400 font-persian">
                  {user?.username}
                </div>
              </div>
              <div className="w-8 h-8 bg-gradient-to-r from-emerald-500/20 to-teal-500/20 text-emerald-400 rounded-lg flex items-center justify-center">
                <User className="h-4 w-4" />
              </div>
            </Button>
          </div>

          {/* Profile Dropdown */}
          {isProfileMenuOpen && (
            <div className="absolute left-0 top-full mt-2 w-48 bg-gray-800 border border-emerald-500/30 rounded-lg shadow-lg z-50">
              <div className="p-3 border-b border-emerald-500/30">
                <div className="text-sm font-medium text-white font-persian">
                  {user?.name} {user?.family}
                </div>
                <div className="text-xs text-gray-400 font-persian">
                  {user?.email}
                </div>
              </div>
              {/* <div className="py-1">
                <Link
                  to="/dashboard/profile"
                  className="flex items-center gap-2 px-3 py-2 text-sm text-gray-300 hover:bg-gradient-to-r hover:from-emerald-500/10 hover:to-teal-500/10 hover:text-emerald-300 font-persian"
                  onClick={() => setIsProfileMenuOpen(false)}
                >
                  <User className="h-4 w-4" />
                  پروفایل کاربری
                </Link> 
                 <Link 
                  to="/dashboard/settings"
                  className="flex items-center gap-2 px-3 py-2 text-sm text-gray-300 hover:bg-gradient-to-r hover:from-emerald-500/10 hover:to-teal-500/10 hover:text-emerald-300 font-persian"
                  onClick={() => setIsProfileMenuOpen(false)}
                >
                  <Settings className="h-4 w-4" />
                  تنظیمات
                </Link> 
              </div> */}
            </div>
          )}
        </div>
      </div>

      {/* Click outside to close dropdowns */}
      {(isProfileMenuOpen || isNotificationOpen) && (
        <div
          className="fixed inset-0 z-40"
          onClick={() => {
            setIsProfileMenuOpen(false);
            setIsNotificationOpen(false);
          }}
        />
      )}
    </header>
  );
}

export default Header;