interface ModalElement {
  type: "modal";
  callbackId: string;          // Unique ID for routing submissions
  title: string;               // Modal title
  submitLabel?: string;        // Submit button text (default: "Submit")
  closeLabel?: string;         // Close button text (default: "Cancel")
  notifyOnClose?: boolean;     // Fire event when closed without submitting
  privateMetadata?: string;    // Pass context through the modal lifecycle
  children: ModalChild[];      // Form inputs
}

chat.onAction("open_form", async (event) => {
  await event.openModal(
    <Modal callbackId="feedback_form" title="Submit Feedback">
      <TextInput id="feedback" label="Your feedback" multiline />
      <Select
        id="category"
        label="Category"
        options={[
          { label: "Bug Report", value: "bug" },
          { label: "Feature Request", value: "feature" },
          { label: "Question", value: "question" },
        ]}
      />
    </Modal>
  );
});

chat.onSlashCommand("/feedback", async (event) => {
  await event.openModal(
    <Modal 
      callbackId="feedback_form" 
      title="Submit Feedback"
      submitLabel="Send"
      closeLabel="Dismiss"
    >
      <TextInput 
        id="message" 
        label="Message" 
        placeholder="Tell us what you think..."
        multiline
      />
    </Modal>
  );
});

interface TextInputElement {
  type: "text_input";
  id: string;
  label: string;
  placeholder?: string;
  initialValue?: string;
  multiline?: boolean;
  optional?: boolean;
  maxLength?: number;
}

<TextInput 
  id="name" 
  label="Full Name" 
  placeholder="John Doe"
  maxLength={100}
/>

<TextInput
  id="description"
  label="Description"
  multiline
  optional
  placeholder="Provide additional details..."
/>

interface SelectElement {
  type: "select";
  id: string;
  label: string;
  options: SelectOptionElement[];
  placeholder?: string;
  initialOption?: string;      // Value of pre-selected option
  optional?: boolean;
}

interface SelectOptionElement {
  label: string;
  value: string;
  description?: string;
}

<Select
  id="priority"
  label="Priority Level"
  placeholder="Choose priority..."
  initialOption="medium"
  options={[
    { label: "Low", value: "low", description: "Non-urgent" },
    { label: "Medium", value: "medium", description: "Normal priority" },
    { label: "High", value: "high", description: "Urgent" },
  ]}
/>

Select({
  id: "status",
  label: "Status",
  options: [
    SelectOption({ label: "Active", value: "active" }),
    SelectOption({ label: "Inactive", value: "inactive" }),
  ],
})

interface RadioSelectElement {
  type: "radio_select";
  id: string;
  label: string;
  options: SelectOptionElement[];
  initialOption?: string;
  optional?: boolean;
}

<RadioSelect
  id="notification"
  label="Notification Preference"
  initialOption="email"
  options={[
    { label: "Email", value: "email" },
    { label: "Slack", value: "slack" },
    { label: "None", value: "none" },
  ]}
/>

chat.onModalSubmit("feedback_form", async (event) => {
  // Access form values
  const feedback = event.values.feedback;
  const category = event.values.category;
  
  // Process the submission
  await saveFeedback({
    user: event.user.userId,
    feedback,
    category,
  });
  
  // Post confirmation to the related thread (if opened from action)
  if (event.relatedThread) {
    await event.relatedThread.post(
      `Thank you for your ${category} feedback!`
    );
  }
  
  // Close the modal (default behavior if no response returned)
});

interface ModalSubmitEvent {
  callbackId: string;
  values: Record<string, string>;  // Input values by ID
  user: Author;                    // Who submitted
  viewId: string;                  // Platform-specific view ID
  privateMetadata?: string;        // Context you passed in
  
  // Context from where modal was opened
  relatedThread?: Thread;          // From ActionEvent.openModal()
  relatedMessage?: SentMessage;    // The message with the button
  relatedChannel?: Channel;        // From SlashCommandEvent.openModal()
  
  adapter: Adapter;
  raw: unknown;
}

chat.onModalSubmit("user_form", async (event) => {
  const email = event.values.email;
  
  if (!email.includes("@")) {
    return {
      action: "errors",
      errors: {
        email: "Please enter a valid email address",
      },
    };
  }
  
  // Process valid submission...
});

chat.onModalSubmit("step1", async (event) => {
  return {
    action: "update",
    modal: Modal({
      callbackId: "step2",
      title: "Step 2 of 2",
      children: [
        TextInput({ id: "details", label: "Additional Details" }),
      ],
    }),
  };
});

chat.onModalSubmit("create_item", async (event) => {
  return {
    action: "push",
    modal: Modal({
      callbackId: "confirm_create",
      title: "Confirm Creation",
      children: [
        Text("Are you sure you want to create this item?"),
      ],
    }),
  };
});

chat.onModalSubmit("cancel_form", async (event) => {
  return { action: "close" };
});

// Open modal with context
chat.onAction("edit_order", async (event) => {
  const orderId = event.value;
  
  await event.openModal(
    <Modal
      callbackId="edit_order_form"
      title="Edit Order"
      privateMetadata={JSON.stringify({ orderId, threadId: event.threadId })}
    >
      <TextInput id="quantity" label="Quantity" />
    </Modal>
  );
});

// Retrieve context in handler
chat.onModalSubmit("edit_order_form", async (event) => {
  const { orderId, threadId } = JSON.parse(event.privateMetadata || "{}");
  
  const quantity = event.values.quantity;
  
  await updateOrder(orderId, { quantity });
});

chat.onModalClose("feedback_form", async (event) => {
  console.log(`User ${event.user.userName} closed the feedback form`);
});

interface ModalCloseEvent {
  callbackId: string;
  user: Author;
  viewId: string;
  privateMetadata?: string;
  relatedThread?: Thread;
  relatedMessage?: SentMessage;
  relatedChannel?: Channel;
  adapter: Adapter;
  raw: unknown;
}

import { Chat, Modal, TextInput, Select, SelectOption, Card, Text, Actions, Button } from "chat";

const chat = new Chat({ /* ... */ });

// Trigger modal from command
chat.onSlashCommand("/create-ticket", async (event) => {
  await event.openModal(
    <Modal
      callbackId="create_ticket"
      title="Create Support Ticket"
      submitLabel="Create"
      notifyOnClose
    >
      <TextInput
        id="subject"
        label="Subject"
        placeholder="Brief description..."
        maxLength={100}
      />
      <TextInput
        id="description"
        label="Description"
        multiline
        placeholder="Detailed explanation..."
      />
      <Select
        id="priority"
        label="Priority"
        options={[
          { label: "Low", value: "low" },
          { label: "Medium", value: "medium" },
          { label: "High", value: "high" },
        ]}
      />
    </Modal>
  );
});

// Handle submission with validation
chat.onModalSubmit("create_ticket", async (event) => {
  const { subject, description, priority } = event.values;
  
  // Validate
  if (subject.length < 5) {
    return {
      action: "errors",
      errors: {
        subject: "Subject must be at least 5 characters",
      },
    };
  }
  
  // Create ticket
  const ticket = await createTicket({
    subject,
    description,
    priority,
    userId: event.user.userId,
  });
  
  // Post confirmation to channel
  if (event.relatedChannel) {
    await event.relatedChannel.post(
      <Card title="Ticket Created">
        <Text style="bold">Ticket #{ticket.id}</Text>
        <Text>{subject}</Text>
        <Text style="muted">Priority: {priority}</Text>
      </Card>
    );
  }
  
  // Modal closes automatically
});

// Track cancellations
chat.onModalClose("create_ticket", async (event) => {
  console.log(`Ticket creation cancelled by ${event.user.userName}`);
});