import React, { useState, useEffect } from "react";
import { useForm } from "react-hook-form";
import { zodResolver } from "@hookform/resolvers/zod";
import * as z from "zod";
import { CalendarIcon, Loader2 } from "lucide-react";
import { format } from "date-fns";

import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import { Button } from "@/components/ui/button";
import { Textarea } from "@/components/ui/textarea";
import { 
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from "@/components/ui/popover";
import { Calendar } from "@/components/ui/calendar";
import { toast } from "@/lib/custom-toast";
import { tasksApi, TaskCreateRequest } from "@/services/tasksApi";
import { Employee } from "@/types";
import SlateRichTextEditor from "@/components/custom/SlateRichTextEditor";

// Form schema
const formSchema = z.object({
  title: z.string().min(1, "Title is required"),
  description: z.string().min(1, "Description is required"),
  type: z.string().min(1, "Type is required"),
  priority: z.string().min(1, "Priority is required"),
  status: z.string().min(1, "Status is required"),
  assignedTo: z.number().nullable(),
  estimates: z.string().optional(),
  stateDate: z.date(),
  endDate: z.date().nullable().optional(),
});

interface AddTaskDialogProps {
  issueId: number;
  onTaskAdded: () => void;
  employees: Employee[];
  isOpen: boolean;
  onOpenChange: (open: boolean) => void;
}

const AddTaskDialog: React.FC<AddTaskDialogProps> = ({
  issueId,
  onTaskAdded,
  employees,
  isOpen,
  onOpenChange,
}) => {
  const [isSubmitting, setIsSubmitting] = useState(false);
  
  console.log("Dialog isOpen state:", isOpen); // Debug log

  // Initialize the form
  const form = useForm<z.infer<typeof formSchema>>({
    resolver: zodResolver(formSchema),
    defaultValues: {
      title: "",
      description: "",
      type: "Task",
      priority: "Medium",
      status: "New",
      assignedTo: null,
      estimates: "",
      stateDate: new Date(),
      endDate: null,
    },
  });

  // Reset form when dialog opens
  useEffect(() => {
    if (isOpen) {
      console.log("Dialog opened, resetting form"); // Debug log
      form.reset();
    }
  }, [isOpen, form]);

  // Handle form submission
  const onSubmit = async (values: z.infer<typeof formSchema>) => {
    setIsSubmitting(true);
    
    try {
      // Prepare task data
      const taskData: TaskCreateRequest = {
        title: values.title,
        description: values.description,
        type: values.type,
        priority: values.priority,
        status: values.status,
        assignedTo: values.assignedTo,
        estimates: values.estimates || "0",
        esUnit: 1, // Default to hours
        stateDate: values.stateDate.toISOString().split('T')[0],
        endDate: values.endDate ? values.endDate.toISOString().split('T')[0] : null,
        remainingHr: 0,
        sprintName: null,
        issuesId: issueId,
      };
      
      console.log("Creating task with data:", taskData); // Debug log
      
      // Create the task
      await tasksApi.create(taskData);
      
      // Show success message
      toast.success("Task created successfully");
      
      // Close the dialog and refresh the tasks list
      onOpenChange(false);
      onTaskAdded();
      
    } catch (error) {
      console.error("Error creating task:", error);
      toast.error("Failed to create task. Please try again.");
    } finally {
      setIsSubmitting(false);
    }
  };

  const handleOpenChange = (newOpen: boolean) => {
    console.log("Dialog openChange triggered:", newOpen); // Debug log
    onOpenChange(newOpen);
  };

  return (
    <Dialog open={isOpen} onOpenChange={handleOpenChange}>
      <DialogContent className="sm:max-w-[550px]">
        <DialogHeader>
          <DialogTitle>Add New Task</DialogTitle>
          <DialogDescription>
            Create a new task linked to this issue.
          </DialogDescription>
        </DialogHeader>
        
        <Form {...form}>
          <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-5">
            <FormField
              control={form.control}
              name="title"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Title</FormLabel>
                  <FormControl>
                    <Input placeholder="Task title" {...field} />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            
            <FormField
              control={form.control}
              name="description"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Description</FormLabel>
                  <FormControl>
                    <SlateRichTextEditor 
                      initialValue={field.value || ''} 
                      onChange={(value) => field.onChange(value)} 
                      placeholder="Task description" 
                      minHeight="150px" 
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            
            <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
              <FormField
                control={form.control}
                name="type"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Type</FormLabel>
                    <FormControl>
                      <Select
                        value={field.value}
                        onValueChange={field.onChange}
                      >
                        <SelectTrigger>
                          <SelectValue placeholder="Select type" />
                        </SelectTrigger>
                        <SelectContent>
                          <SelectItem value="Task">Task</SelectItem>
                          <SelectItem value="Bug">Bug</SelectItem>
                          <SelectItem value="Documentation">Documentation</SelectItem>
                          <SelectItem value="Enhancement">Enhancement</SelectItem>
                        </SelectContent>
                      </Select>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              
              <FormField
                control={form.control}
                name="priority"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Priority</FormLabel>
                    <FormControl>
                      <Select
                        value={field.value}
                        onValueChange={field.onChange}
                      >
                        <SelectTrigger>
                          <SelectValue placeholder="Select priority" />
                        </SelectTrigger>
                        <SelectContent>
                          <SelectItem value="Low">Low</SelectItem>
                          <SelectItem value="Medium">Medium</SelectItem>
                          <SelectItem value="High">High</SelectItem>
                          <SelectItem value="Critical">Critical</SelectItem>
                        </SelectContent>
                      </Select>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
            </div>
            
            <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
              <FormField
                control={form.control}
                name="status"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Status</FormLabel>
                    <FormControl>
                      <Select
                        value={field.value}
                        onValueChange={field.onChange}
                      >
                        <SelectTrigger>
                          <SelectValue placeholder="Select status" />
                        </SelectTrigger>
                        <SelectContent>
                          <SelectItem value="New">New</SelectItem>
                          <SelectItem value="In Progress">In Progress</SelectItem>
                          <SelectItem value="In Review">In Review</SelectItem>
                          <SelectItem value="Completed">Completed</SelectItem>
                          <SelectItem value="Closed">Closed</SelectItem>
                        </SelectContent>
                      </Select>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              
              <FormField
                control={form.control}
                name="assignedTo"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Assigned To</FormLabel>
                    <FormControl>
                      <Select
                        value={field.value ? field.value.toString() : "null"}
                        onValueChange={(value) => field.onChange(value === "null" ? null : parseInt(value))}
                      >
                        <SelectTrigger>
                          <SelectValue placeholder="Select assignee" />
                        </SelectTrigger>
                        <SelectContent>
                          <SelectItem value="null">Unassigned</SelectItem>
                          {employees.map((employee) => (
                            <SelectItem key={employee.id} value={employee.id.toString()}>
                              {employee.firstName} {employee.lastName}
                            </SelectItem>
                          ))}
                        </SelectContent>
                      </Select>
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
            </div>
            
            <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
              <FormField
                control={form.control}
                name="stateDate"
                render={({ field }) => (
                  <FormItem className="flex flex-col">
                    <FormLabel>Start Date</FormLabel>
                    <Popover>
                      <PopoverTrigger asChild>
                        <FormControl>
                          <Button
                            type="button"
                            variant="outline"
                            className={`w-full pl-3 text-left font-normal ${!field.value ? "text-muted-foreground" : ""}`}
                          >
                            {field.value ? (
                              format(field.value, "PPP")
                            ) : (
                              <span>Pick a date</span>
                            )}
                            <CalendarIcon className="ml-auto h-4 w-4 opacity-50" />
                          </Button>
                        </FormControl>
                      </PopoverTrigger>
                      <PopoverContent className="w-auto p-0" align="start">
                        <Calendar
                          mode="single"
                          selected={field.value}
                          onSelect={field.onChange}
                          initialFocus
                        />
                      </PopoverContent>
                    </Popover>
                    <FormMessage />
                  </FormItem>
                )}
              />
              
              <FormField
                control={form.control}
                name="endDate"
                render={({ field }) => (
                  <FormItem className="flex flex-col">
                    <FormLabel>Due Date</FormLabel>
                    <Popover>
                      <PopoverTrigger asChild>
                        <FormControl>
                          <Button
                            type="button"
                            variant="outline"
                            className={`w-full pl-3 text-left font-normal ${!field.value ? "text-muted-foreground" : ""}`}
                          >
                            {field.value ? (
                              format(field.value, "PPP")
                            ) : (
                              <span>Pick a date</span>
                            )}
                            <CalendarIcon className="ml-auto h-4 w-4 opacity-50" />
                          </Button>
                        </FormControl>
                      </PopoverTrigger>
                      <PopoverContent className="w-auto p-0" align="start">
                        <Calendar
                          mode="single"
                          selected={field.value || undefined}
                          onSelect={field.onChange}
                          initialFocus
                        />
                      </PopoverContent>
                    </Popover>
                    <FormMessage />
                  </FormItem>
                )}
              />
            </div>
            
            <FormField
              control={form.control}
              name="estimates"
              render={({ field }) => (
                <FormItem>
                  <FormLabel>Estimated Hours</FormLabel>
                  <FormControl>
                    <Input 
                      type="number"
                      placeholder="Estimated hours to complete"
                      {...field}
                    />
                  </FormControl>
                  <FormMessage />
                </FormItem>
              )}
            />
            
            <DialogFooter className="pt-2">
              <Button
                type="button"
                variant="outline"
                onClick={() => onOpenChange(false)}
                disabled={isSubmitting}
              >
                Cancel
              </Button>
              <Button type="submit" disabled={isSubmitting}>
                {isSubmitting ? (
                  <>
                    <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                    Creating...
                  </>
                ) : (
                  "Create Task"
                )}
              </Button>
            </DialogFooter>
          </form>
        </Form>
      </DialogContent>
    </Dialog>
  );
};

export default AddTaskDialog;