"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import { toast } from "sonner";
import { Button } from "@/components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Textarea } from "@/components/ui/textarea";
import { createSprint } from "@/app/(frontend)/projects/actions";

interface CreateSprintDialogProps {
  readonly projectId: number;
  readonly open: boolean;
  readonly onOpenChange: (open: boolean) => void;
}

export function CreateSprintDialog({ projectId, open, onOpenChange }: CreateSprintDialogProps) {
  const router = useRouter();
  const [name, setName] = useState("");
  const [goal, setGoal] = useState("");
  const [startDate, setStartDate] = useState("");
  const [endDate, setEndDate] = useState("");
  const [capacity, setCapacity] = useState("");
  const [pending, setPending] = useState(false);
  const [error, setError] = useState<string | null>(null);

  function reset() {
    setName("");
    setGoal("");
    setStartDate("");
    setEndDate("");
    setCapacity("");
    setPending(false);
    setError(null);
  }

  async function handleSubmit() {
    const trimmedName = name.trim();
    const parsedCapacity = capacity ? Number(capacity) : null;
    if (!trimmedName) {
      setError("Sprint name is required.");
      return;
    }
    if (parsedCapacity !== null && (!Number.isInteger(parsedCapacity) || parsedCapacity < 0)) {
      setError("Capacity must be a whole number of points.");
      return;
    }

    setPending(true);
    setError(null);
    try {
      const result = await createSprint({
        projectId,
        name: trimmedName,
        goal: goal.trim() || undefined,
        startDate: startDate || undefined,
        endDate: endDate || undefined,
        capacity: parsedCapacity ?? undefined,
      });
      if (!result.success) {
        setError(result.error ?? "Could not create the sprint.");
        setPending(false);
        return;
      }
      onOpenChange(false);
      reset();
      toast.success("Sprint created");
      router.refresh();
    } catch (caught) {
      setError(caught instanceof Error ? caught.message : "Could not create the sprint.");
      setPending(false);
    }
  }

  return (
    <Dialog
      open={open}
      onOpenChange={(nextOpen) => {
        onOpenChange(nextOpen);
        if (!nextOpen) reset();
      }}
    >
      <DialogContent>
        <DialogHeader>
          <DialogTitle>Create sprint</DialogTitle>
          <DialogDescription>Define a focused delivery window for this project.</DialogDescription>
        </DialogHeader>
        <form
          className="flex flex-col gap-4"
          onSubmit={(event) => {
            event.preventDefault();
            void handleSubmit();
          }}
        >
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="sprint-name">Name</Label>
            <Input
              id="sprint-name"
              placeholder="Sprint 01"
              value={name}
              onChange={(event) => setName(event.target.value)}
              disabled={pending}
            />
          </div>
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="sprint-goal">Goal</Label>
            <Textarea
              id="sprint-goal"
              rows={3}
              placeholder="What should this sprint deliver?"
              value={goal}
              onChange={(event) => setGoal(event.target.value)}
              disabled={pending}
            />
          </div>
          <div className="grid grid-cols-1 gap-3 sm:grid-cols-3">
            <div className="flex flex-col gap-1.5">
              <Label htmlFor="sprint-start">Start date</Label>
              <Input
                id="sprint-start"
                type="date"
                value={startDate}
                onChange={(event) => setStartDate(event.target.value)}
                disabled={pending}
              />
            </div>
            <div className="flex flex-col gap-1.5">
              <Label htmlFor="sprint-end">End date</Label>
              <Input
                id="sprint-end"
                type="date"
                value={endDate}
                onChange={(event) => setEndDate(event.target.value)}
                disabled={pending}
              />
            </div>
            <div className="flex flex-col gap-1.5">
              <Label htmlFor="sprint-capacity">Capacity</Label>
              <Input
                id="sprint-capacity"
                type="number"
                min={0}
                step={1}
                placeholder="40"
                value={capacity}
                onChange={(event) => setCapacity(event.target.value)}
                disabled={pending}
              />
            </div>
          </div>
          {error && (
            <p role="alert" className="text-sm text-destructive">
              {error}
            </p>
          )}
          <DialogFooter>
            <Button type="button" variant="outline" onClick={() => onOpenChange(false)} disabled={pending}>
              Cancel
            </Button>
            <Button type="submit" disabled={pending}>
              {pending ? "Creating..." : "Create sprint"}
            </Button>
          </DialogFooter>
        </form>
      </DialogContent>
    </Dialog>
  );
}