// frontend/components/tasks/KanbanView.tsx
"use client";
import { useState } from "react";
import { Icon } from "@/components/Icon";
import { cx } from "@/lib/cx";
import { COLUMNS } from "@/lib/tasks/tree";
import type { Person, Project, Status, Task } from "@/lib/types";
import { KanbanCard } from "./KanbanCard";

export function KanbanView({
  tasks,
  people,
  projects,
  onOpen,
  onMove,
  onAdd,
}: {
  tasks: Task[];
  people: Record<string, Person>;
  projects: Record<string, Project>;
  onOpen: (id: string) => void;
  onMove: (id: string, status: Status) => void;
  onAdd: (status: Status, title: string) => void;
}) {
  const [dragId, setDragId] = useState<string | null>(null);
  const [overCol, setOverCol] = useState<string | null>(null);
  const [addCol, setAddCol] = useState<string | null>(null);
  const [text, setText] = useState("");
  const submit = (status: Status) => {
    if (text.trim()) onAdd(status, text.trim());
    setText("");
    setAddCol(null);
  };
  return (
    <div className="kboard">
      {COLUMNS.map((col) => {
        const items = tasks.filter((t) => t.status === col.id);
        return (
          <div
            key={col.id}
            className={cx("kcol", overCol === col.id && "over")}
            onDragOver={(e) => {
              e.preventDefault();
              if (overCol !== col.id) setOverCol(col.id);
            }}
            onDragLeave={(e) => {
              if (e.currentTarget === e.target) setOverCol(null);
            }}
            onDrop={(e) => {
              e.preventDefault();
              if (dragId) onMove(dragId, col.id as Status);
              setDragId(null);
              setOverCol(null);
            }}
          >
            <div className="kcol-head">
              <span className="kcol-dot" style={{ background: col.accent }} />
              <span className="kcol-label">{col.label}</span>
              <span className="kcol-count">{items.length}</span>
              <button
                className="kcol-add"
                onClick={() => {
                  setAddCol(col.id);
                  setText("");
                }}
                aria-label="작업 추가"
              >
                <Icon name="plus" />
              </button>
            </div>
            <div className="kcol-body">
              {addCol === col.id && (
                <div className="quickadd">
                  <input
                    autoFocus
                    value={text}
                    placeholder="작업 입력 후 Enter…"
                    onChange={(e) => setText(e.target.value)}
                    onKeyDown={(e) => {
                      if (e.key === "Enter") submit(col.id as Status);
                      if (e.key === "Escape") setAddCol(null);
                    }}
                    onBlur={() => submit(col.id as Status)}
                  />
                </div>
              )}
              {items.map((t) => (
                <KanbanCard
                  key={t.id}
                  task={t}
                  people={people}
                  projects={projects}
                  onOpen={onOpen}
                  dragging={dragId === t.id}
                  onDragStart={(e) => {
                    setDragId(t.id);
                    e.dataTransfer.effectAllowed = "move";
                  }}
                  onDragEnd={() => {
                    setDragId(null);
                    setOverCol(null);
                  }}
                />
              ))}
              {items.length === 0 && addCol !== col.id && (
                <div className="kcol-empty">여기로 작업을 옮겨보세요</div>
              )}
            </div>
          </div>
        );
      })}
    </div>
  );
}