From 41fb21c85398ae54eb34e1bcad4a1cbcef49d431 Mon Sep 17 00:00:00 2001
From: Alexandre Pereira <alexandre.carneiro.pereira@gmail.com>
Date: Sun, 17 Mar 2024 21:25:46 +0000
Subject: [PATCH] feat: poc drag n drop

---
 app/components/Card/Card.tsx       | 43 +++++++++++++++++++--
 app/components/Column/Column.tsx   | 62 +++++++++++++++++++++++++++---
 app/routes/board/queries.server.ts | 41 ++++++++++++++++++++
 app/routes/board/route.tsx         | 52 +++++++++++++++++++++++--
 4 files changed, 187 insertions(+), 11 deletions(-)
 create mode 100644 app/routes/board/queries.server.ts

diff --git a/app/components/Card/Card.tsx b/app/components/Card/Card.tsx
index 68266a1..f5d03a3 100644
--- a/app/components/Card/Card.tsx
+++ b/app/components/Card/Card.tsx
@@ -1,11 +1,48 @@
-type CardPropsTypes = {
+import clsx from "clsx";
+import { useState } from "react";
+
+export type CardPropsTypes = {
   title: string;
   content: string;
+  id: number;
+  columnId: number;
 };
 
-export default function Card({ title, content }: CardPropsTypes) {
+export default function Card({ title, content, id, columnId }: CardPropsTypes) {
+  const [isDragging, setIsDragging] = useState(false);
+
+  const handleOnDragStart = (e: React.DragEvent<HTMLDivElement>) => {
+    e.dataTransfer.effectAllowed = "move";
+    e.dataTransfer.setData("application/hunters-card", id.toString());
+    e.dataTransfer.setData("application/hunters-column", columnId.toString());
+    setTimeout(() => {
+      setIsDragging(true); // This is a hack to make the "placeholder" card a different color
+    }, 0);
+    console.log("drag start for id: ", { id, columnId });
+  };
+
+  const handleOnDragEnd = () => {
+    setIsDragging(false);
+  };
+
+  const handleOnDragOver = (e: React.DragEvent<HTMLDivElement>) => {
+    // To use later for ordering within the column
+    e.preventDefault();
+  };
+
   return (
-    <div draggable className="border-2 bg-sky-50 text-xl">
+    <div
+      className={clsx(
+        "border-2",
+        "bg-slate-500",
+        isDragging && "opacity-50", // Set styles for the place holder here
+        "text-xl",
+      )}
+      draggable
+      onDragStart={handleOnDragStart}
+      onDragEnd={handleOnDragEnd}
+      onDragOver={handleOnDragOver}
+    >
       <h1>{title}</h1>
       <p>{content}</p>
     </div>
diff --git a/app/components/Column/Column.tsx b/app/components/Column/Column.tsx
index 331e1b8..7f62ba8 100644
--- a/app/components/Column/Column.tsx
+++ b/app/components/Column/Column.tsx
@@ -1,13 +1,65 @@
-import Card from "~/components/Card/Card";
+import clsx from "clsx";
+import { useState } from "react";
+import Card, { CardPropsTypes } from "~/components/Card/Card";
+import { useSubmit } from "@remix-run/react";
+
+type ColumnPropsTypes = {
+  cards: CardPropsTypes[];
+  columnId: number;
+};
+
+export default function Column({ cards, columnId }: ColumnPropsTypes) {
+  const [isDraggedOver, setIsDraggedOver] = useState(false);
+  const [hasDrop, setHasDrop] = useState(false);
+  const submit = useSubmit();
+
+  const handleOnDrop = (e: React.DragEvent<HTMLDivElement>) => {
+    // Needed to be a droppable zone
+    e.preventDefault(); // Should add filtering to check if valid drop
+    const cardId = e.dataTransfer.getData("application/hunters-card");
+    console.log("drop", { cardId, columnId });
+    submit({ cardId, columnId }, { method: "POST", navigate: false });
+    setIsDraggedOver(false);
+    setHasDrop(true);
+    setTimeout(() => {
+      setHasDrop(false);
+    }, 1000);
+  };
+
+  const handleOnDragOver = (e: React.DragEvent<HTMLDivElement>) => {
+    e.dataTransfer.setData("application/hunters-column", columnId.toString());
+
+    // Needed to be a droppable zone
+    e.preventDefault(); // Should add filtering to check if valid drop
+    setIsDraggedOver(true);
+  };
+
+  const handleOnDragLeave = (e: React.DragEvent<HTMLDivElement>) => {
+    e.dataTransfer.clearData("application/hunters-column");
+    setIsDraggedOver(false);
+  };
+
+  const handleOnDragEnter = (e: React.DragEvent<HTMLDivElement>) => {
+    e.dataTransfer.setData("application/hunters-column", columnId.toString());
+    console.log("drag enter");
+  };
 
-export default function Column() {
   return (
     <div
-      className="border border-solid border-1 border-gray-700 rounded-md py-5 px-2"
-      onDragOver={() => console.log("dragging over")}
+      className={clsx(
+        "border-1 min-h-48 rounded-md border border-solid border-gray-700 px-2 py-5",
+        isDraggedOver ? "bg-sky-50" : "bg-slate-500",
+        [hasDrop && "bg-red-400"],
+      )}
+      onDrop={handleOnDrop}
+      onDragOver={handleOnDragOver}
+      onDragLeave={handleOnDragLeave}
+      onDragEnter={handleOnDragEnter}
     >
       <h1>This is a column</h1>
-      <Card title="hello" content="world" />
+      {cards.map((card) => (
+        <Card key={card.id} {...card} />
+      ))}
     </div>
   );
 }
diff --git a/app/routes/board/queries.server.ts b/app/routes/board/queries.server.ts
new file mode 100644
index 0000000..620df01
--- /dev/null
+++ b/app/routes/board/queries.server.ts
@@ -0,0 +1,41 @@
+import db from "~/db/db.server";
+
+export async function getBoards() {
+  const { rows } = await db.execute("SELECT * FROM queries");
+  return rows;
+}
+
+export type ColumnType = { id: number; name: string };
+export type CardType = { id: number; name: string; columnId: number };
+export async function getCardsAndColumns() {
+  const { rows: column } = await db.execute({
+    sql: `
+    SELECT column.id, column.name FROM column
+    LEFT JOIN board ON column.boardId = board.id
+    WHERE board.id = ?;
+    `,
+    args: [1],
+  });
+
+  const { rows: card } = await db.execute({
+    sql: `
+    SELECT card.id, card.name, card.columnId FROM card
+    FULL JOIN column ON card.columnId = column.id
+    FULL JOIN board ON column.boardId = board.id
+    WHERE board.id = ?;
+  `,
+    args: [1],
+  });
+
+  return { column, card } as unknown as {
+    column: ColumnType[];
+    card: CardType[];
+  };
+}
+
+export async function mutateCardColumn(cardId: number, columnId: number) {
+  await db.execute({
+    sql: "UPDATE card SET columnId = ? WHERE id = ?;",
+    args: [columnId, cardId],
+  });
+}
diff --git a/app/routes/board/route.tsx b/app/routes/board/route.tsx
index f13ee60..1c89346 100644
--- a/app/routes/board/route.tsx
+++ b/app/routes/board/route.tsx
@@ -1,13 +1,59 @@
 import Column from "~/components/Column/Column";
+import {
+  type CardType,
+  type ColumnType,
+  getCardsAndColumns,
+  mutateCardColumn,
+} from "./queries.server";
+import { useLoaderData } from "@remix-run/react";
+import { ActionFunctionArgs } from "@remix-run/node";
+import invariant from "invariant";
+
+export async function loader() {
+  const data = await getCardsAndColumns();
+  return data;
+}
+
+export async function action({ request }: ActionFunctionArgs) {
+  const data = await request.formData();
+  const cardId = data.get("cardId");
+  invariant(cardId, "cardId is required");
+  const columnId = data.get("columnId");
+  invariant(columnId, "columnId is required");
+  await mutateCardColumn(
+    parseInt(cardId.toString()),
+    parseInt(columnId.toString()),
+  );
+
+  return { ok: true };
+}
+
+function mapCardsToColumns(columns: ColumnType[], cards: CardType[]) {
+  return columns.map((column) => {
+    return {
+      ...column,
+      cards: cards.filter((card) => card.columnId === column.id),
+    };
+  });
+}
 
 export default function Board() {
+  const { column, card } = useLoaderData<typeof loader>();
+  const columns = mapCardsToColumns(column, card);
   return (
     <div>
       <h1>Board</h1>
+      <p>{JSON.stringify(columns, null, 4)}</p>
       <div className="flex flex-row gap-2">
-        <Column />
-        <Column />
-        <Column />
+        {columns.map((column) => {
+          const cards = column.cards.map((card) => ({
+            ...card,
+            title: card.name,
+            content: card.name,
+            id: card.id,
+          }));
+          return <Column cards={cards} key={column.id} columnId={column.id} />;
+        })}
       </div>
     </div>
   );