From 7fdb76bca64e2e72768f6de7bfa3fea98d2d5bbb Mon Sep 17 00:00:00 2001
From: dan <me@danrh.co.uk>
Date: Wed, 30 Aug 2023 14:41:37 -0400
Subject: feat: add form builder component

---
 src/components/FormBuilder/index.js | 315 ++++++++++++++++++++++++++++++++++++
 1 file changed, 315 insertions(+)
 create mode 100644 src/components/FormBuilder/index.js

diff --git a/src/components/FormBuilder/index.js b/src/components/FormBuilder/index.js
new file mode 100644
index 0000000..b9f0389
--- /dev/null
+++ b/src/components/FormBuilder/index.js
@@ -0,0 +1,315 @@
+import { DragIndicator, Clear } from "@mui/icons-material";
+import {
+  Card,
+  CardContent,
+  CardHeader,
+  IconButton,
+  Stack,
+  TextField,
+} from "@mui/material";
+import React, { useRef, useState } from "react";
+export default function FormBuilder() {
+  return (
+    <Stack direction={"column"}>
+      <h3>FormBuilder</h3>
+      <Stack
+        direction={"row"}
+        justifyContent={"space-between"}
+        alignItems={"flex-start"}
+        spacing={2}
+      >
+        <Form initialForm={false} editable />
+        <WidgetsLibrary />
+      </Stack>
+    </Stack>
+  );
+}
+
+const availableWidgets = {
+  label: {
+    name: "Label",
+    element: (props) => (
+      <TextField
+        id="outlined-basic"
+        variant="standard"
+        value={props?.name}
+        onChange={(e) =>
+          props?.setFormField({ ...props, name: e.target.value })
+        }
+        fullWidth
+      />
+    ),
+    finalElement: (props) => <div>{props?.id}</div>,
+  },
+  number: {
+    name: "Number",
+    element: (props) => (
+      <TextField
+        id="outlined-basic"
+        label={props?.id ? `example field ${props.id}` : "Outlined"}
+        variant="outlined"
+        type={"number"}
+        fullWidth
+      />
+    ),
+  },
+  text: {
+    name: "Text",
+    element: (props) => (
+      <TextField
+        id="outlined-basic"
+        label={props?.id ? `example field ${props.id}` : "Outlined"}
+        variant="outlined"
+        fullWidth
+      />
+    ),
+  },
+  multiline: {
+    name: "Multiline",
+    element: (props) => (
+      <TextField
+        id="outlined-textarea"
+        label={props?.id ? `example field ${props.id}` : "Multiline"}
+        placeholder="Placeholder"
+        multiline
+        minRows={4}
+        fullWidth
+      />
+    ),
+  },
+};
+
+function WidgetsLibrary() {
+  return (
+    <Stack
+      direction={"column"}
+      spacing={0.5}
+      alignItems={"flex-start"}
+      sx={{ maxHeight: "100vh", height: "100%", overflow: "scroll" }}
+    >
+      {Object.keys(availableWidgets).map((k) => {
+        const props = availableWidgets[k];
+        return <WidgetCard key={k} type={k} {...props} />;
+      })}
+    </Stack>
+  );
+}
+
+function WidgetCard({ name, element, type, finalElement }) {
+  function onDragStart(e) {
+    e.dataTransfer.setData("application/formwidgettype", type);
+    e.dataTransfer.effectAllowed = "copy";
+    console.log(e);
+  }
+
+  const disabledFieldOverlay = {
+    pointerEvents: "none",
+    background: "#7773",
+    zIndex: 10,
+  };
+  if (!element) {
+    return;
+  } else {
+    return (
+      <Card
+        draggable
+        onDragStart={onDragStart}
+        sx={{ cursor: "grab", width: "100%" }}
+      >
+        <Stack
+          direction={"row"}
+          justifyContent={"start"}
+          alignItems={"center"}
+          alignContent={"center"}
+        >
+          <DragIndicator />
+          <div>
+            <CardHeader title={name} />
+            <CardContent>
+              <div style={disabledFieldOverlay}>
+                {finalElement ? finalElement() : element()}
+              </div>
+            </CardContent>
+          </div>
+        </Stack>
+      </Card>
+    );
+  }
+}
+
+function FormField(props) {
+  if (!props?.type) {
+    console.log("formfield render failed", props);
+    return;
+  }
+  const { element: Element } = availableWidgets[props?.type];
+  const dragHandleRef = useRef();
+  const [target, setTarget] = useState();
+  return (
+    <Stack
+      direction={"row"}
+      sx={{ width: "100%", cursor: "grab" }}
+      alignItems={"center"}
+      justifyContent={"space-between"}
+      draggable
+      onMouseDown={(e) => setTarget(e.target)}
+      onDragStart={(e) => {
+        if (dragHandleRef.current.contains(target)) {
+          e.dataTransfer.setData("application/formwidgetid", props?.id);
+        } else {
+          e.preventDefault();
+        }
+      }}
+    >
+      <span ref={dragHandleRef}>
+        <DragIndicator />
+      </span>
+      <Element {...props} />
+      <IconButton onClick={() => props?.deleteFormField()}>
+        <Clear />
+      </IconButton>
+    </Stack>
+  );
+}
+
+function capture(e) {
+  e.stopPropagation();
+  e.preventDefault();
+}
+
+function DropZone({ insertField, index, moveField }) {
+  const [dragOver, setDragOver] = useState(false);
+  return (
+    <span
+      style={{
+        marginTop: "2px",
+        marginBottom: "2px",
+        width: "100%",
+        color: "transparent",
+        background: dragOver ? "#22a9" : "#2221",
+        height: dragOver ? "2em" : "4px",
+        borderRadius: 8,
+      }}
+      onDragOver={(e) => capture(e) || setDragOver(true)}
+      onDragExit={() => setDragOver(false)}
+      onDrop={(e) => {
+        e.stopPropagation();
+        e.preventDefault();
+        setDragOver(false);
+        console.log(e);
+        if ([...e.dataTransfer.types].includes("application/formwidgettype")) {
+          const type = e.dataTransfer.getData("application/formwidgettype");
+          insertField({ index, type });
+        } else if (
+          [...e.dataTransfer.types].includes("application/formwidgetid")
+        ) {
+          const oldId = e.dataTransfer.getData("application/formwidgetid");
+          moveField(oldId, index);
+        }
+      }}
+    />
+  );
+}
+
+function Form({ initialForm, editable }) {
+  const [form, setForm] = useState({ fields: [], ...initialForm });
+
+  function updateFormField(newField) {
+    setForm({
+      ...form,
+      fields: form.fields.map((field) =>
+        field?.id === newField.id ? newField : field,
+      ),
+    });
+  }
+
+  function deleteFormField(id) {
+    const newForm = {
+      ...form,
+      fields: form.fields.filter((field) => id !== field?.id),
+    };
+    console.log("deleteFormField", { id, form, newForm });
+    setForm({ ...newForm });
+  }
+  console.log("render", form.fields);
+
+  function insertField({ index, type }) {
+    const id = crypto.randomUUID();
+    const newField = {
+      id,
+      type,
+    };
+    form?.fields?.splice(index + 1, 0, newField);
+    setForm({ ...form });
+  }
+
+  function moveField(oldId, newIndex) {
+    console.log({ oldId, newIndex });
+    const oldIndex = form.fields.findIndex(({ id }) => id === oldId);
+    const [oldFormField] = form.fields.splice(oldIndex, 1);
+    if (oldIndex > newIndex) {
+      newIndex++;
+    }
+    form.fields.splice(newIndex, 0, oldFormField);
+    console.log("newform", form);
+    setForm({ ...form });
+  }
+
+  if (!editable && !initialForm) {
+    return;
+    // else if (!initialForm) {
+    //   return <FormInitialPrompt />;
+    // }
+  } else {
+    return (
+      <Stack sx={{ width: "100%" }}>
+        <FormHeader form={form} />
+        {editable && (
+          <DropZone
+            moveField={moveField}
+            insertField={insertField}
+            index={-1}
+          />
+        )}
+        {form?.fields?.map((props, i) => (
+          <Grouping key={props?.id}>
+            <FormField
+              setFormField={(field) => updateFormField(field)}
+              deleteFormField={() => deleteFormField(props.id)}
+              {...props}
+            />
+            {editable && (
+              <DropZone
+                moveField={moveField}
+                insertField={insertField}
+                index={i}
+              />
+            )}
+          </Grouping>
+        ))}
+      </Stack>
+    );
+  }
+}
+
+function FormHeader() {
+  return;
+}
+
+//function FormInitialPrompt() {
+//  return (
+//    <div
+//      style={{
+//        minWidth: "50vh",
+//        minHeight: "50vh",
+//        background: "#33333333",
+//      }}
+//    >
+//      Drag and drop and field here to get started
+//    </div>
+//  );
+//}
+//
+function Grouping({ children }) {
+  return <>{children}</>;
+}
-- 
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