import { useState, useEffect } from "react";
import { X } from "lucide-react";
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogDescription,
  DialogFooter,
} from "@/components/ui/dialog";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { createBoard, createBoardFromTemplate } from "@/lib/board-factory";
import { saveBoard, listTemplates, deleteTemplate } from "@/lib/storage";
import { useAppStore } from "@/stores/app-store";
import { useBoardStore } from "@/stores/board-store";
import type { BoardTemplate } from "@/types/template";

const PRESET_COLORS = [
  "#6366f1", // indigo
  "#8b5cf6", // violet
  "#ec4899", // pink
  "#f43f5e", // rose
  "#f97316", // orange
  "#eab308", // yellow
  "#22c55e", // green
  "#06b6d4", // cyan
];

type Template = "blank" | "kanban" | "sprint";

interface NewBoardDialogProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
}

export function NewBoardDialog({ open, onOpenChange }: NewBoardDialogProps) {
  const [title, setTitle] = useState("");
  const [color, setColor] = useState(PRESET_COLORS[0]);
  const [template, setTemplate] = useState<Template>("blank");
  const [selectedUserTemplate, setSelectedUserTemplate] = useState<BoardTemplate | null>(null);
  const [userTemplates, setUserTemplates] = useState<BoardTemplate[]>([]);
  const [creating, setCreating] = useState(false);

  const refreshBoards = useAppStore((s) => s.refreshBoards);
  const setView = useAppStore((s) => s.setView);
  const addRecentBoard = useAppStore((s) => s.addRecentBoard);
  const openBoard = useBoardStore((s) => s.openBoard);

  useEffect(() => {
    if (open) {
      listTemplates().then(setUserTemplates);
    }
  }, [open]);

  async function handleCreate() {
    const trimmed = title.trim();
    if (!trimmed || creating) return;

    setCreating(true);
    try {
      const board = selectedUserTemplate
        ? createBoardFromTemplate(selectedUserTemplate, trimmed)
        : createBoard(trimmed, color, template);
      if (selectedUserTemplate) {
        // Use color from template, but override if user picked a different color
        // (we keep template color by default)
      } else {
        // color already set on board via createBoard
      }
      await saveBoard(board);
      await refreshBoards();
      await openBoard(board.id);
      setView({ type: "board", boardId: board.id });
      addRecentBoard(board.id);
      onOpenChange(false);
      resetForm();
    } finally {
      setCreating(false);
    }
  }

  function resetForm() {
    setTitle("");
    setColor(PRESET_COLORS[0]);
    setTemplate("blank");
    setSelectedUserTemplate(null);
  }

  async function handleDeleteTemplate(templateId: string) {
    await deleteTemplate(templateId);
    setUserTemplates((prev) => prev.filter((t) => t.id !== templateId));
    if (selectedUserTemplate?.id === templateId) {
      setSelectedUserTemplate(null);
    }
  }

  function handleKeyDown(e: React.KeyboardEvent) {
    if (e.key === "Enter" && title.trim()) {
      handleCreate();
    }
  }

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="bg-pylon-surface sm:max-w-md">
        <DialogHeader>
          <DialogTitle className="font-heading text-pylon-text">
            New Board
          </DialogTitle>
          <DialogDescription className="text-pylon-text-secondary">
            Create a new board to organize your work.
          </DialogDescription>
        </DialogHeader>

        <div className="flex flex-col gap-4">
          {/* Title input */}
          <div>
            <label
              htmlFor="board-title"
              className="mb-1.5 block font-mono text-xs uppercase tracking-widest text-pylon-text-secondary"
            >
              Title
            </label>
            <Input
              id="board-title"
              placeholder="My Board"
              value={title}
              onChange={(e) => setTitle(e.target.value)}
              onKeyDown={handleKeyDown}
              autoFocus
              className="bg-pylon-bg text-pylon-text"
            />
          </div>

          {/* Color picker */}
          <div>
            <label className="mb-1.5 block font-mono text-xs uppercase tracking-widest text-pylon-text-secondary">
              Color
            </label>
            <div className="flex gap-2">
              {PRESET_COLORS.map((c) => (
                <button
                  key={c}
                  type="button"
                  onClick={() => setColor(c)}
                  className="size-8 rounded-full transition-transform hover:scale-110"
                  style={{
                    backgroundColor: c,
                    outline:
                      color === c ? "2px solid currentColor" : "none",
                    outlineOffset: "2px",
                  }}
                  aria-label={`Color ${c}`}
                />
              ))}
            </div>
          </div>

          {/* Template selector */}
          <div>
            <label className="mb-1.5 block font-mono text-xs uppercase tracking-widest text-pylon-text-secondary">
              Template
            </label>
            <div className="flex flex-wrap gap-2">
              {(["blank", "kanban", "sprint"] as const).map((t) => (
                <Button
                  key={t}
                  type="button"
                  variant={template === t && !selectedUserTemplate ? "default" : "outline"}
                  size="sm"
                  onClick={() => { setTemplate(t); setSelectedUserTemplate(null); }}
                  aria-pressed={template === t && !selectedUserTemplate}
                  className="capitalize"
                >
                  {t}
                </Button>
              ))}
              {userTemplates.map((ut) => (
                <div key={ut.id} className="flex items-center gap-0.5">
                  <Button
                    type="button"
                    variant={selectedUserTemplate?.id === ut.id ? "default" : "outline"}
                    size="sm"
                    onClick={() => { setSelectedUserTemplate(ut); setColor(ut.color); }}
                    aria-pressed={selectedUserTemplate?.id === ut.id}
                  >
                    <span
                      className="inline-block size-2 rounded-full shrink-0"
                      style={{ backgroundColor: ut.color }}
                    />
                    {ut.name}
                  </Button>
                  <button
                    type="button"
                    onClick={() => handleDeleteTemplate(ut.id)}
                    className="rounded p-0.5 text-pylon-text-secondary opacity-0 hover:opacity-100 hover:bg-pylon-danger/10 hover:text-pylon-danger transition-opacity"
                    aria-label="Delete template"
                  >
                    <X className="size-3" />
                  </button>
                </div>
              ))}
            </div>
          </div>
        </div>

        <DialogFooter>
          <Button
            variant="ghost"
            onClick={() => onOpenChange(false)}
            className="text-pylon-text-secondary"
          >
            Cancel
          </Button>
          <Button
            onClick={handleCreate}
            disabled={!title.trim() || creating}
          >
            Create
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}