From fd149c3cbfc96c254bdabd890a900556d2ff5f5e Mon Sep 17 00:00:00 2001
From: Devessier <baptiste@devessier.fr>
Date: Fri, 6 Sep 2024 18:01:41 +0200
Subject: [PATCH] feat: display an empty trigger node when there is no trigger
 yet

---
 .../RightDrawerWorkflowEditStepContent.tsx    |  9 +-
 .../WorkflowDiagramBaseStepNode.tsx           | 19 ++--
 .../components/WorkflowDiagramCanvas.tsx      |  2 +
 .../WorkflowDiagramEmptyTrigger.tsx           | 30 +++++++
 .../components/WorkflowEditTriggerForm.tsx    | 90 +++++++++++--------
 .../workflow/utils/generateWorkflowDiagram.ts | 45 ++++++----
 .../utils/getWorkflowVersionDiagram.ts        | 12 +--
 7 files changed, 140 insertions(+), 67 deletions(-)
 create mode 100644 packages/twenty-front/src/modules/workflow/components/WorkflowDiagramEmptyTrigger.tsx

diff --git a/packages/twenty-front/src/modules/workflow/components/RightDrawerWorkflowEditStepContent.tsx b/packages/twenty-front/src/modules/workflow/components/RightDrawerWorkflowEditStepContent.tsx
index a5669f9898782..5cbb7e9b05c5d 100644
--- a/packages/twenty-front/src/modules/workflow/components/RightDrawerWorkflowEditStepContent.tsx
+++ b/packages/twenty-front/src/modules/workflow/components/RightDrawerWorkflowEditStepContent.tsx
@@ -23,7 +23,10 @@ const getStepDefinitionOrThrow = ({
 
   if (stepId === TRIGGER_STEP_ID) {
     if (!isDefined(currentVersion.trigger)) {
-      throw new Error('Expected to find the definition of the trigger');
+      return {
+        type: 'trigger',
+        definition: undefined,
+      } as const;
     }
 
     return {
@@ -33,7 +36,9 @@ const getStepDefinitionOrThrow = ({
   }
 
   if (!isDefined(currentVersion.steps)) {
-    throw new Error('Expected to find an array of steps');
+    throw new Error(
+      'Expected to find an array of steps while trying to locate a specific step',
+    );
   }
 
   const selectedNodePosition = findStepPositionOrThrow({
diff --git a/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramBaseStepNode.tsx b/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramBaseStepNode.tsx
index b3bedb789b0ab..8c05d48baa09c 100644
--- a/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramBaseStepNode.tsx
+++ b/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramBaseStepNode.tsx
@@ -4,6 +4,8 @@ import { Handle, Position } from '@xyflow/react';
 import React from 'react';
 import { capitalize } from '~/utils/string/capitalize';
 
+type Variant = 'placeholder';
+
 const StyledStepNodeContainer = styled.div`
   display: flex;
   flex-direction: column;
@@ -34,16 +36,19 @@ const StyledStepNodeType = styled.div`
   }
 `;
 
-const StyledStepNodeInnerContainer = styled.div`
+const StyledStepNodeInnerContainer = styled.div<{ variant?: Variant }>`
   background-color: ${({ theme }) => theme.background.secondary};
   border: 1px solid ${({ theme }) => theme.border.color.medium};
+  border-style: ${({ variant }) =>
+    variant === 'placeholder' ? 'dashed' : null};
   border-radius: ${({ theme }) => theme.border.radius.md};
   display: flex;
   gap: ${({ theme }) => theme.spacing(2)};
   padding: ${({ theme }) => theme.spacing(2)};
 
   position: relative;
-  box-shadow: ${({ theme }) => theme.boxShadow.superHeavy};
+  box-shadow: ${({ variant, theme }) =>
+    variant === 'placeholder' ? 'none' : theme.boxShadow.superHeavy};
 
   .selectable.selected &,
   .selectable:focus &,
@@ -53,12 +58,14 @@ const StyledStepNodeInnerContainer = styled.div`
   }
 `;
 
-const StyledStepNodeLabel = styled.div`
+const StyledStepNodeLabel = styled.div<{ variant?: Variant }>`
   align-items: center;
   display: flex;
   font-size: ${({ theme }) => theme.font.size.md};
   font-weight: ${({ theme }) => theme.font.weight.medium};
   column-gap: ${({ theme }) => theme.spacing(2)};
+  color: ${({ variant, theme }) =>
+    variant === 'placeholder' ? theme.font.color.extraLight : null};
 `;
 
 const StyledSourceHandle = styled(Handle)`
@@ -72,10 +79,12 @@ export const StyledTargetHandle = styled(Handle)`
 export const WorkflowDiagramBaseStepNode = ({
   nodeType,
   label,
+  variant,
   Icon,
 }: {
   nodeType: WorkflowDiagramStepNodeData['nodeType'];
   label: string;
+  variant?: Variant;
   Icon?: React.ReactNode;
 }) => {
   return (
@@ -84,10 +93,10 @@ export const WorkflowDiagramBaseStepNode = ({
         <StyledTargetHandle type="target" position={Position.Top} />
       ) : null}
 
-      <StyledStepNodeInnerContainer>
+      <StyledStepNodeInnerContainer variant={variant}>
         <StyledStepNodeType>{capitalize(nodeType)}</StyledStepNodeType>
 
-        <StyledStepNodeLabel>
+        <StyledStepNodeLabel variant={variant}>
           {Icon}
 
           {label}
diff --git a/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramCanvas.tsx b/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramCanvas.tsx
index 6d65014a8995d..ef1123f4eed61 100644
--- a/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramCanvas.tsx
+++ b/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramCanvas.tsx
@@ -1,5 +1,6 @@
 import { WorkflowDiagramCanvasEffect } from '@/workflow/components/WorkflowDiagramCanvasEffect';
 import { WorkflowDiagramCreateStepNode } from '@/workflow/components/WorkflowDiagramCreateStepNode';
+import { WorkflowDiagramEmptyTrigger } from '@/workflow/components/WorkflowDiagramEmptyTrigger';
 import { WorkflowDiagramStepNode } from '@/workflow/components/WorkflowDiagramStepNode';
 import { workflowDiagramState } from '@/workflow/states/workflowDiagramState';
 import {
@@ -72,6 +73,7 @@ export const WorkflowDiagramCanvas = ({
       nodeTypes={{
         default: WorkflowDiagramStepNode,
         'create-step': WorkflowDiagramCreateStepNode,
+        'empty-trigger': WorkflowDiagramEmptyTrigger,
       }}
       fitView
       nodes={nodes.map((node) => ({ ...node, draggable: false }))}
diff --git a/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramEmptyTrigger.tsx b/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramEmptyTrigger.tsx
new file mode 100644
index 0000000000000..a355733219ab8
--- /dev/null
+++ b/packages/twenty-front/src/modules/workflow/components/WorkflowDiagramEmptyTrigger.tsx
@@ -0,0 +1,30 @@
+import { WorkflowDiagramBaseStepNode } from '@/workflow/components/WorkflowDiagramBaseStepNode';
+import { useTheme } from '@emotion/react';
+import styled from '@emotion/styled';
+import { IconPlaylistAdd } from 'twenty-ui';
+
+const StyledStepNodeLabelIconContainer = styled.div`
+  align-items: center;
+  background: ${({ theme }) => theme.background.transparent.light};
+  border-radius: ${({ theme }) => theme.spacing(1)};
+  display: flex;
+  justify-content: center;
+  padding: ${({ theme }) => theme.spacing(1)};
+`;
+
+export const WorkflowDiagramEmptyTrigger = () => {
+  const theme = useTheme();
+
+  return (
+    <WorkflowDiagramBaseStepNode
+      label="Add a Trigger"
+      nodeType="trigger"
+      variant="placeholder"
+      Icon={
+        <StyledStepNodeLabelIconContainer>
+          <IconPlaylistAdd size={16} color={theme.font.color.tertiary} />
+        </StyledStepNodeLabelIconContainer>
+      }
+    />
+  );
+};
diff --git a/packages/twenty-front/src/modules/workflow/components/WorkflowEditTriggerForm.tsx b/packages/twenty-front/src/modules/workflow/components/WorkflowEditTriggerForm.tsx
index e345d3e65c423..c074fb84dc2d3 100644
--- a/packages/twenty-front/src/modules/workflow/components/WorkflowEditTriggerForm.tsx
+++ b/packages/twenty-front/src/modules/workflow/components/WorkflowEditTriggerForm.tsx
@@ -49,37 +49,33 @@ export const WorkflowEditTriggerForm = ({
   trigger,
   onUpdateTrigger,
 }: {
-  trigger: WorkflowTrigger;
+  trigger: WorkflowTrigger | undefined;
   onUpdateTrigger: (trigger: WorkflowTrigger) => void;
 }) => {
   const theme = useTheme();
 
   const { activeObjectMetadataItems } = useFilteredObjectMetadataItems();
 
-  const triggerEvent = splitWorkflowTriggerEventName(
-    trigger.settings.eventName,
-  );
+  const triggerEvent = isDefined(trigger)
+    ? splitWorkflowTriggerEventName(trigger.settings.eventName)
+    : undefined;
 
   const availableMetadata: Array<SelectOption<string>> =
     activeObjectMetadataItems.map((item) => ({
       label: item.labelPlural,
       value: item.nameSingular,
     }));
-  const recordTypeMetadata = activeObjectMetadataItems.find(
-    (item) => item.nameSingular === triggerEvent.objectType,
-  );
-  if (!isDefined(recordTypeMetadata)) {
-    throw new Error(
-      'Expected to find the metadata configuration for the currently selected record type of the trigger.',
-    );
-  }
+  const recordTypeMetadata = isDefined(triggerEvent)
+    ? activeObjectMetadataItems.find(
+        (item) => item.nameSingular === triggerEvent.objectType,
+      )
+    : undefined;
 
-  const selectedEvent = OBJECT_EVENT_TRIGGERS.find(
-    (availableEvent) => availableEvent.value === triggerEvent.event,
-  );
-  if (!isDefined(selectedEvent)) {
-    throw new Error('Expected to find the currently selected event type.');
-  }
+  const selectedEvent = isDefined(triggerEvent)
+    ? OBJECT_EVENT_TRIGGERS.find(
+        (availableEvent) => availableEvent.value === triggerEvent.event,
+      )
+    : undefined;
 
   return (
     <>
@@ -89,11 +85,15 @@ export const WorkflowEditTriggerForm = ({
         </StyledTriggerHeaderIconContainer>
 
         <StyledTriggerHeaderTitle>
-          When a {recordTypeMetadata.labelSingular} is {selectedEvent.label}
+          {isDefined(recordTypeMetadata) && isDefined(selectedEvent)
+            ? `When a ${recordTypeMetadata.labelSingular} is ${selectedEvent.label}`
+            : '-'}
         </StyledTriggerHeaderTitle>
 
         <StyledTriggerHeaderType>
-          Trigger . Record is {selectedEvent.label}
+          {isDefined(selectedEvent)
+            ? `Trigger . Record is ${selectedEvent.label}`
+            : '-'}
         </StyledTriggerHeaderType>
       </StyledTriggerHeader>
 
@@ -102,32 +102,50 @@ export const WorkflowEditTriggerForm = ({
           dropdownId="workflow-edit-trigger-record-type"
           label="Record Type"
           fullWidth
-          value={triggerEvent.objectType}
+          value={triggerEvent?.objectType}
           options={availableMetadata}
           onChange={(updatedRecordType) => {
-            onUpdateTrigger({
-              ...trigger,
-              settings: {
-                ...trigger.settings,
-                eventName: `${updatedRecordType}.${triggerEvent.event}`,
-              },
-            });
+            onUpdateTrigger(
+              isDefined(trigger) && isDefined(triggerEvent)
+                ? {
+                    ...trigger,
+                    settings: {
+                      ...trigger.settings,
+                      eventName: `${updatedRecordType}.${triggerEvent.event}`,
+                    },
+                  }
+                : {
+                    type: 'DATABASE_EVENT',
+                    settings: {
+                      eventName: `${updatedRecordType}.${OBJECT_EVENT_TRIGGERS[0].value}`,
+                    },
+                  },
+            );
           }}
         />
         <Select
           dropdownId="workflow-edit-trigger-event-type"
           label="Event type"
           fullWidth
-          value={triggerEvent.event}
+          value={triggerEvent?.event}
           options={OBJECT_EVENT_TRIGGERS}
           onChange={(updatedEvent) => {
-            onUpdateTrigger({
-              ...trigger,
-              settings: {
-                ...trigger.settings,
-                eventName: `${triggerEvent.objectType}.${updatedEvent}`,
-              },
-            });
+            onUpdateTrigger(
+              isDefined(trigger) && isDefined(triggerEvent)
+                ? {
+                    ...trigger,
+                    settings: {
+                      ...trigger.settings,
+                      eventName: `${triggerEvent.objectType}.${updatedEvent}`,
+                    },
+                  }
+                : {
+                    type: 'DATABASE_EVENT',
+                    settings: {
+                      eventName: `${availableMetadata[0].value}.${updatedEvent}`,
+                    },
+                  },
+            );
           }}
         />
       </StyledTriggerSettings>
diff --git a/packages/twenty-front/src/modules/workflow/utils/generateWorkflowDiagram.ts b/packages/twenty-front/src/modules/workflow/utils/generateWorkflowDiagram.ts
index 80559ff94ca09..7d1c9f5e7eb97 100644
--- a/packages/twenty-front/src/modules/workflow/utils/generateWorkflowDiagram.ts
+++ b/packages/twenty-front/src/modules/workflow/utils/generateWorkflowDiagram.ts
@@ -7,6 +7,7 @@ import {
 } from '@/workflow/types/WorkflowDiagram';
 import { splitWorkflowTriggerEventName } from '@/workflow/utils/splitWorkflowTriggerEventName';
 import { MarkerType } from '@xyflow/react';
+import { isDefined } from 'twenty-ui';
 import { v4 } from 'uuid';
 import { capitalize } from '~/utils/string/capitalize';
 
@@ -14,7 +15,7 @@ export const generateWorkflowDiagram = ({
   trigger,
   steps,
 }: {
-  trigger: WorkflowTrigger;
+  trigger: WorkflowTrigger | undefined;
   steps: Array<WorkflowStep>;
 }): WorkflowDiagram => {
   const nodes: Array<WorkflowDiagramNode> = [];
@@ -62,20 +63,34 @@ export const generateWorkflowDiagram = ({
 
   // Start with the trigger node
   const triggerNodeId = TRIGGER_STEP_ID;
-  const triggerEvent = splitWorkflowTriggerEventName(
-    trigger.settings.eventName,
-  );
-  nodes.push({
-    id: triggerNodeId,
-    data: {
-      nodeType: 'trigger',
-      label: `${capitalize(triggerEvent.objectType)} is ${capitalize(triggerEvent.event)}`,
-    },
-    position: {
-      x: 0,
-      y: 0,
-    },
-  });
+
+  if (isDefined(trigger)) {
+    const triggerEvent = splitWorkflowTriggerEventName(
+      trigger.settings.eventName,
+    );
+
+    nodes.push({
+      id: triggerNodeId,
+      data: {
+        nodeType: 'trigger',
+        label: `${capitalize(triggerEvent.objectType)} is ${capitalize(triggerEvent.event)}`,
+      },
+      position: {
+        x: 0,
+        y: 0,
+      },
+    });
+  } else {
+    nodes.push({
+      id: triggerNodeId,
+      type: 'empty-trigger',
+      data: {} as any,
+      position: {
+        x: 0,
+        y: 0,
+      },
+    });
+  }
 
   let lastStepId = triggerNodeId;
 
diff --git a/packages/twenty-front/src/modules/workflow/utils/getWorkflowVersionDiagram.ts b/packages/twenty-front/src/modules/workflow/utils/getWorkflowVersionDiagram.ts
index a1a073f0a64e3..e119b1d2c5c97 100644
--- a/packages/twenty-front/src/modules/workflow/utils/getWorkflowVersionDiagram.ts
+++ b/packages/twenty-front/src/modules/workflow/utils/getWorkflowVersionDiagram.ts
@@ -11,18 +11,12 @@ const EMPTY_DIAGRAM: WorkflowDiagram = {
 export const getWorkflowVersionDiagram = (
   workflowVersion: WorkflowVersion | undefined,
 ): WorkflowDiagram => {
-  if (
-    !(
-      isDefined(workflowVersion) &&
-      isDefined(workflowVersion.trigger) &&
-      isDefined(workflowVersion.steps)
-    )
-  ) {
+  if (!isDefined(workflowVersion)) {
     return EMPTY_DIAGRAM;
   }
 
   return generateWorkflowDiagram({
-    trigger: workflowVersion.trigger,
-    steps: workflowVersion.steps,
+    trigger: workflowVersion.trigger ?? undefined,
+    steps: workflowVersion.steps ?? [],
   });
 };