"use client";

import { useEffect, useState, useRef } from "react";
import { useForm, Controller } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  Button,
  Input,
  Textarea,
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
  Label,
  ComboboxItemProps,
} from "ikoncomponents";
import { Plus } from "lucide-react";
import { getUsersApi } from "@/app/utils/api/projectApi";
import { projectSchema, ProjectFormData } from "./zodProject";
import { useAppCache } from "@/app/utils/context/AppCacheContext";

interface User {
  userId: string;
  userName: string;
  userEmail: string;
  active: boolean;
}

interface CreateProjectModalProps {
  open: boolean;
  onClose: (open: boolean) => void;
  onSubmit: (data: ProjectFormData) => void;
  projectManagerDropdownOptions: ComboboxItemProps[];
}

export default function CreateProjectModal({
  open,
  onClose,
  onSubmit,
  projectManagerDropdownOptions,
}: CreateProjectModalProps) {
  const {
    control,
    handleSubmit,
    formState: { errors },
    setValue,
    watch,
    reset,
  } = useForm<ProjectFormData>({
    resolver: zodResolver(projectSchema),
    defaultValues: {
      projectName: "",
      projectDescription: "",
      projectStatus: "Active",
      projectManager: "",
      projectTeam: [],
      contractedStartDate: "",
      contractedEndDate: "",
      source: "manual",
      productType: "",
    },
  });

  const projectTeam = watch("projectTeam");

  const [users, setUsers] = useState<User[]>([]);
  const [loadingUsers, setLoadingUsers] = useState(false);
  const [teamDropdownOpen, setTeamDropdownOpen] = useState(false);
  const [managerDropdown, setManagerDropdown] = useState<ComboboxItemProps[]>(
    [],
  );

  const dropdownRef = useRef<HTMLDivElement>(null);

  // Project Manager options come from the shared app-wide cache.
  const { projectManagerOptions } = useAppCache();

  useEffect(() => {
    if (!open) {
      reset();
      return;
    }

    const fetchUsers = async () => {
      setLoadingUsers(true);
      try {
        const data = await getUsersApi();
        setUsers(data ?? []);
      } finally {
        setLoadingUsers(false);
      }
    };

    fetchUsers();
  }, [open, reset]);

  // Keep the manager dropdown in sync with the cached Project Manager options.
  useEffect(() => {
    setManagerDropdown(
      projectManagerOptions.map((opt) => ({
        label: opt.label,
        value: opt.value,
      })),
    );
  }, [projectManagerOptions]);

  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (
        dropdownRef.current &&
        !dropdownRef.current.contains(event.target as Node)
      ) {
        setTeamDropdownOpen(false);
      }
    };

    if (teamDropdownOpen) {
      document.addEventListener("mousedown", handleClickOutside);
    }

    return () => document.removeEventListener("mousedown", handleClickOutside);
  }, [teamDropdownOpen]);

  const toggleTeamMember = (userId: string) => {
    setValue(
      "projectTeam",
      projectTeam.includes(userId)
        ? projectTeam.filter((id) => id !== userId)
        : [...projectTeam, userId],
      { shouldValidate: true },
    );
  };

  return (
    <Dialog open={open} onOpenChange={onClose}>
      <DialogContent className="max-w-3xl!">
        <DialogHeader>
          <DialogTitle className="text-xl">Create New Project</DialogTitle>
        </DialogHeader>

        <form onSubmit={handleSubmit(onSubmit)} className="grid gap-5 pt-2">
          {/* Project Name */}
          <div className="space-y-1.5">
            <Label>
              Project Name<span className="ml-0.5 text-red-500">*</span>
            </Label>
            <Controller
              control={control}
              name="projectName"
              render={({ field }) => <Input {...field} />}
            />
            {errors.projectName && (
              <p className="text-xs text-red-500">
                {errors.projectName.message}
              </p>
            )}
          </div>

          {/* Description */}
          <div className="space-y-1.5">
            <Label>
              Description<span className="ml-0.5 text-red-500">*</span>
            </Label>
            <Controller
              control={control}
              name="projectDescription"
              render={({ field }) => <Textarea {...field} />}
            />
            {errors.projectDescription && (
              <p className="text-xs text-red-500">
                {errors.projectDescription.message}
              </p>
            )}
          </div>

          {/* Dates */}
          <div className="grid grid-cols-2 gap-4">
            <div className="space-y-1.5">
              <Label>
                Start Date<span className="ml-0.5 text-red-500">*</span>
              </Label>
              <Controller
                control={control}
                name="contractedStartDate"
                render={({ field }) => <Input type="date" {...field} />}
              />
              {errors.contractedStartDate && (
                <p className="text-xs text-red-500">
                  {errors.contractedStartDate.message}
                </p>
              )}
            </div>

            <div className="space-y-1.5">
              <Label>
                End Date<span className="ml-0.5 text-red-500">*</span>
              </Label>
              <Controller
                control={control}
                name="contractedEndDate"
                render={({ field }) => <Input type="date" {...field} />}
              />
              {errors.contractedEndDate && (
                <p className="text-xs text-red-500">
                  {errors.contractedEndDate.message}
                </p>
              )}
            </div>
          </div>

          <div className="grid grid-cols-2 gap-4">
            {/* Project Manager */}
            <div className="space-y-1.5">
              <Label>
                Project Manager<span className="ml-0.5 text-red-500">*</span>
              </Label>

              <Controller
                control={control}
                name="projectManager"
                render={({ field }) => (
                  <Select value={field.value} onValueChange={field.onChange}>
                    <SelectTrigger className="w-full">
                      <SelectValue placeholder="Select manager" />
                    </SelectTrigger>
                    <SelectContent className="w-full">
                      {managerDropdown.map((option, index) => {
                        return (
                          <SelectItem key={index} value={option.value}>
                            {option.label}
                          </SelectItem>
                        );
                      })}
                    </SelectContent>
                  </Select>
                )}
              />

              {errors.projectManager && (
                <p className="text-xs text-red-500">
                  {errors.projectManager.message}
                </p>
              )}
            </div>

            {/* Project Team */}
            <div ref={dropdownRef} className="space-y-1.5">
              <Label>
                Project Team<span className="ml-0.5 text-red-500">*</span>
              </Label>

              <Button
                type="button"
                variant="outline"
                className="w-full justify-between"
                onClick={() => setTeamDropdownOpen((p) => !p)}
              >
                {projectTeam.length
                  ? `${projectTeam.length} member(s) selected`
                  : "Select team members"}
                ▾
              </Button>

              {teamDropdownOpen && (
                <div className="mt-1.5 rounded-md border bg-background shadow-md">
                  <div className="max-h-56 space-y-1 overflow-y-auto p-2">
                    {users.map((u) => (
                      <label
                        key={u.userId}
                        className="flex cursor-pointer items-center gap-2 rounded-sm px-2 py-1.5 text-sm hover:bg-muted"
                      >
                        <input
                          type="checkbox"
                          checked={projectTeam.includes(u.userId)}
                          onChange={() => toggleTeamMember(u.userId)}
                        />
                        {u.userName}
                      </label>
                    ))}
                  </div>
                </div>
              )}

              {errors.projectTeam && (
                <p className="text-xs text-red-500">
                  {errors.projectTeam.message}
                </p>
              )}
            </div>
          </div>

          {/* Footer */}
          <div className="mt-2 flex justify-end gap-3 border-t pt-4">
            <Button type="submit" className="flex items-center gap-2">
              <Plus className="h-4 w-4" />
              Create Project
            </Button>
          </div>
        </form>
      </DialogContent>
    </Dialog>
  );
}