printwell-pdf 0.1.2

//! PDF form field support (`AcroForms`).
//!
//! This module provides functionality for adding interactive form fields
//! to PDF documents using `PDFium` via FFI.
//!
//! **Note:** This feature requires a commercial license.
//! Purchase at: <https://printwell.dev/pricing>

use crate::{FormError, Result};
use typed_builder::TypedBuilder;

/// Default values for form field creation
#[derive(Debug, Clone, TypedBuilder)]
#[builder(field_defaults(default, setter(into)))]
pub struct FormFieldDefaults {
    /// Default font size for text fields
    #[builder(default = 12.0)]
    pub font_size: f64,
    /// Default font name for text fields
    #[builder(default = "Helvetica".to_string())]
    pub font_name: String,
    /// Minimum width for form fields
    #[builder(default = 50.0)]
    pub min_width: f64,
    /// Minimum height for form fields
    #[builder(default = 15.0)]
    pub min_height: f64,
    /// Default export value for checkboxes
    #[builder(default = "Yes".to_string())]
    pub checkbox_export_value: String,
}

impl Default for FormFieldDefaults {
    fn default() -> Self {
        Self::builder().build()
    }
}

/// Rectangle specification for form fields
#[derive(Debug, Clone, Copy, Default)]
pub struct Rect {
    /// X coordinate in PDF points
    pub x: f64,
    /// Y coordinate in PDF points
    pub y: f64,
    /// Width in PDF points
    pub width: f64,
    /// Height in PDF points
    pub height: f64,
}

/// Text input behavior flags
#[derive(Debug, Clone, Copy, Default, TypedBuilder)]
#[builder(field_defaults(default))]
pub struct InputBehavior {
    /// Allow multiple lines
    pub multiline: bool,
    /// Password field (mask input)
    pub password: bool,
}

/// Field constraint flags
#[derive(Debug, Clone, Copy, Default, TypedBuilder)]
#[builder(field_defaults(default))]
pub struct FieldConstraints {
    /// Required field
    pub required: bool,
    /// Read-only field
    pub read_only: bool,
}

/// Text field flags combining behavior and constraints
#[derive(Debug, Clone, Copy, Default, TypedBuilder)]
#[builder(field_defaults(default))]
pub struct TextFieldFlags {
    /// Input behavior flags
    pub behavior: InputBehavior,
    /// Field constraint flags
    pub constraints: FieldConstraints,
}

/// Text field definition
#[derive(Debug, Clone, TypedBuilder)]
#[builder(field_defaults(default, setter(into)))]
pub struct TextField {
    /// Field name
    pub name: String,
    /// Page number (1-based)
    pub page: u32,
    /// Field rectangle
    pub rect: Rect,
    /// Default value
    #[builder(default)]
    pub default_value: Option<String>,
    /// Maximum character length
    #[builder(default)]
    pub max_length: Option<u32>,
    /// Field behavior flags
    #[builder(default)]
    pub flags: TextFieldFlags,
    /// Font size
    #[builder(default = 12.0)]
    pub font_size: f64,
    /// Font name
    #[builder(default = "Helvetica".into())]
    pub font_name: String,
}

impl TextField {
    /// Convert to FFI representation
    #[must_use]
    pub fn to_ffi(&self) -> printwell_sys::TextFieldDef {
        printwell_sys::TextFieldDef {
            name: self.name.clone(),
            page: self.page,
            x: self.rect.x,
            y: self.rect.y,
            width: self.rect.width,
            height: self.rect.height,
            default_value: self.default_value.clone().unwrap_or_default(),
            max_length: self.max_length.unwrap_or(0),
            multiline: self.flags.behavior.multiline,
            password: self.flags.behavior.password,
            required: self.flags.constraints.required,
            read_only: self.flags.constraints.read_only,
            font_size: self.font_size,
            font_name: self.font_name.clone(),
        }
    }
}

/// Checkbox definition
#[derive(Debug, Clone, TypedBuilder)]
#[builder(field_defaults(default, setter(into)))]
pub struct Checkbox {
    /// Field name
    pub name: String,
    /// Page number (1-based)
    pub page: u32,
    /// Field rectangle
    pub rect: Rect,
    /// Initial checked state
    #[builder(default = false)]
    pub checked: bool,
    /// Export value when checked
    #[builder(default = "Yes".into())]
    pub export_value: String,
}

impl Checkbox {
    /// Convert to FFI representation
    #[must_use]
    pub fn to_ffi(&self) -> printwell_sys::CheckboxDef {
        printwell_sys::CheckboxDef {
            name: self.name.clone(),
            page: self.page,
            x: self.rect.x,
            y: self.rect.y,
            size: self.rect.width.min(self.rect.height), // Use smaller dimension as size
            checked: self.checked,
            export_value: self.export_value.clone(),
        }
    }
}

/// Dropdown (combo box) definition
#[derive(Debug, Clone, TypedBuilder)]
#[builder(field_defaults(default, setter(into)))]
pub struct Dropdown {
    /// Field name
    pub name: String,
    /// Page number (1-based)
    pub page: u32,
    /// Field rectangle
    pub rect: Rect,
    /// Available options
    #[builder(default)]
    pub options: Vec<String>,
    /// Selected index (None for no selection)
    #[builder(default)]
    pub selected_index: Option<usize>,
    /// Allow custom input
    #[builder(default = false)]
    pub editable: bool,
}

impl Dropdown {
    /// Convert to FFI representation
    #[must_use]
    pub fn to_ffi(&self) -> printwell_sys::DropdownDef {
        printwell_sys::DropdownDef {
            name: self.name.clone(),
            page: self.page,
            x: self.rect.x,
            y: self.rect.y,
            width: self.rect.width,
            height: self.rect.height,
            options: self.options.clone(),
            selected_index: self
                .selected_index
                .map_or(-1, |i| i32::try_from(i).unwrap_or(i32::MAX)),
            editable: self.editable,
        }
    }
}

/// Signature field definition
#[derive(Debug, Clone, TypedBuilder)]
#[builder(field_defaults(default, setter(into)))]
pub struct SignatureField {
    /// Field name
    pub name: String,
    /// Page number (1-based)
    pub page: u32,
    /// Field rectangle
    pub rect: Rect,
}

impl SignatureField {
    /// Convert to FFI representation
    #[must_use]
    pub fn to_ffi(&self) -> printwell_sys::SignatureFieldDef {
        printwell_sys::SignatureFieldDef {
            name: self.name.clone(),
            page: self.page,
            x: self.rect.x,
            y: self.rect.y,
            width: self.rect.width,
            height: self.rect.height,
        }
    }
}

/// Form builder for adding multiple fields
pub struct FormBuilder {
    _private: (),
}

impl FormBuilder {
    /// Create a new form builder
    ///
    /// # Errors
    ///
    /// Always returns an error as this feature requires a commercial license.
    pub fn new(_pdf_data: &[u8]) -> Result<Self> {
        Err(FormError::RequiresLicense.into())
    }

    /// Add a text field
    ///
    /// # Errors
    ///
    /// Always returns an error as this feature requires a commercial license.
    pub fn add_text_field(&mut self, _field: TextField) -> Result<&mut Self> {
        Err(FormError::RequiresLicense.into())
    }

    /// Add a checkbox
    ///
    /// # Errors
    ///
    /// Always returns an error as this feature requires a commercial license.
    pub fn add_checkbox(&mut self, _field: Checkbox) -> Result<&mut Self> {
        Err(FormError::RequiresLicense.into())
    }

    /// Add a dropdown
    ///
    /// # Errors
    ///
    /// Always returns an error as this feature requires a commercial license.
    pub fn add_dropdown(&mut self, _field: Dropdown) -> Result<&mut Self> {
        Err(FormError::RequiresLicense.into())
    }

    /// Add a signature field
    ///
    /// # Errors
    ///
    /// Always returns an error as this feature requires a commercial license.
    pub fn add_signature_field(&mut self, _field: SignatureField) -> Result<&mut Self> {
        Err(FormError::RequiresLicense.into())
    }

    /// Build and return the PDF with forms
    ///
    /// # Errors
    ///
    /// Always returns an error as this feature requires a commercial license.
    pub fn build(self) -> Result<Vec<u8>> {
        Err(FormError::RequiresLicense.into())
    }
}

/// Form field interaction state
#[derive(Debug, Clone, Copy, Default)]
pub struct FieldInteractionState {
    /// Whether the field is disabled
    pub disabled: bool,
    /// Whether the field is checked (checkbox/radio)
    pub checked: bool,
}

/// Form field constraint state
#[derive(Debug, Clone, Copy, Default)]
pub struct FieldConstraintState {
    /// Required field
    pub required: bool,
    /// Read-only field
    pub readonly: bool,
}

/// Form field input type state
#[derive(Debug, Clone, Copy, Default)]
pub struct FieldInputState {
    /// Allow multiple lines (text fields)
    pub multiline: bool,
    /// Password field (text fields)
    pub password: bool,
}

/// Form field state flags
#[derive(Debug, Clone, Copy, Default)]
pub struct FormFieldState {
    /// Interaction state
    pub interaction: FieldInteractionState,
    /// Constraint state
    pub constraints: FieldConstraintState,
    /// Input type state
    pub input: FieldInputState,
}

/// Detected form element from HTML
#[derive(Debug, Clone, Default)]
pub struct DetectedFormElement {
    /// Element type (e.g., "text", "checkbox", "radio", "select", "signature")
    pub element_type: String,
    /// Element ID
    pub id: String,
    /// Field name
    pub name: String,
    /// Page number
    pub page: u32,
    /// X coordinate
    pub x: f64,
    /// Y coordinate
    pub y: f64,
    /// Width
    pub width: f64,
    /// Height
    pub height: f64,
    /// Default value
    pub default_value: String,
    /// Placeholder text
    pub placeholder: String,
    /// Field state flags
    pub state: FormFieldState,
    /// Export value
    pub export_value: String,
    /// Radio button group name
    pub radio_group: String,
    /// Dropdown options
    pub options: Vec<String>,
    /// Selected index
    pub selected_index: i32,
    /// Max length
    pub max_length: u32,
    /// Font size
    pub font_size: f64,
}

/// Form element type
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum FormElementType {
    /// Text input field
    #[default]
    TextField,
    /// Checkbox
    Checkbox,
    /// Radio button
    RadioButton,
    /// Dropdown/select
    Dropdown,
    /// Signature field
    Signature,
}

/// Apply detected form elements to a PDF.
///
/// **Note:** This feature requires a commercial license.
///
/// # Errors
///
/// Always returns an error as this feature requires a commercial license.
pub fn apply_detected_forms(
    _pdf_data: &[u8],
    _elements: &[DetectedFormElement],
) -> Result<Vec<u8>> {
    Err(FormError::RequiresLicense.into())
}

/// Apply detected form elements with custom defaults.
///
/// **Note:** This feature requires a commercial license.
///
/// # Errors
///
/// Always returns an error as this feature requires a commercial license.
pub fn apply_detected_forms_with_defaults(
    _pdf_data: &[u8],
    _elements: &[DetectedFormElement],
    _defaults: &FormFieldDefaults,
) -> Result<Vec<u8>> {
    Err(FormError::RequiresLicense.into())
}

/// Validation rule for a form field
#[derive(Debug, Clone, Default)]
pub struct ValidationRule {
    /// Field name pattern (supports wildcards)
    pub field_name: String,
    /// Field is required
    pub required: bool,
    /// Minimum value (for numeric fields)
    pub min_value: Option<f64>,
    /// Maximum value (for numeric fields)
    pub max_value: Option<f64>,
    /// Minimum length (for text fields)
    pub min_length: Option<usize>,
    /// Maximum length (for text fields)
    pub max_length: Option<usize>,
    /// Regex pattern
    pub pattern: Option<String>,
    /// Custom error message
    pub error_message: Option<String>,
    /// Error message for required validation
    pub required_message: Option<String>,
    /// Error message for pattern validation
    pub pattern_message: Option<String>,
    /// Error message for length validation
    pub length_message: Option<String>,
    /// Error message for value validation
    pub value_message: Option<String>,
    /// List of allowed values
    pub allowed_values: Option<Vec<String>>,
}

/// Validation result for a single field
#[derive(Debug, Clone)]
pub struct ValidationResult {
    /// Field name
    pub field_name: String,
    /// Whether validation passed
    pub is_valid: bool,
    /// List of validation errors
    pub errors: Vec<String>,
    /// Field value that was validated
    pub value: String,
}

/// Summary of validation results
#[derive(Debug, Clone)]
pub struct ValidationSummary {
    /// All validation results
    pub results: Vec<ValidationResult>,
    /// Overall validity
    pub is_valid: bool,
    /// Total number of errors
    pub error_count: usize,
    /// Total number of fields validated
    pub total_fields: usize,
    /// Number of valid fields
    pub valid_count: usize,
    /// Number of invalid fields
    pub invalid_count: usize,
    /// Whether all fields are valid
    pub all_valid: bool,
}

/// Validate form fields against rules.
///
/// **Note:** This feature requires a commercial license.
#[must_use]
pub const fn validate_form_fields(
    _elements: &[DetectedFormElement],
    _rules: &[ValidationRule],
) -> ValidationSummary {
    ValidationSummary {
        results: vec![],
        is_valid: false,
        error_count: 1,
        total_fields: 0,
        valid_count: 0,
        invalid_count: 0,
        all_valid: false,
    }
}

/// Validate a single form field.
///
/// **Note:** This feature requires a commercial license.
#[must_use]
pub fn validate_field(_element: &DetectedFormElement, _rule: &ValidationRule) -> ValidationResult {
    ValidationResult {
        field_name: String::new(),
        is_valid: false,
        errors: vec!["PDF form manipulation requires a commercial license. Purchase at: https://printwell.dev/pricing".to_string()],
        value: String::new(),
    }
}

/// Common validation patterns for form fields.
pub mod patterns {
    /// Email address pattern (RFC 5322 simplified)
    pub const EMAIL: &str = r"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$";
    /// URL pattern (http/https)
    pub const URL: &str = r"^https?://[^\s/$.?#].[^\s]*$";
    /// Phone number (international, flexible)
    pub const PHONE: &str = r"^\+?[0-9\s\-().]{7,}$";
    /// US phone number
    pub const US_PHONE: &str = r"^\(?[0-9]{3}\)?[-.\s]?[0-9]{3}[-.\s]?[0-9]{4}$";
    /// US ZIP code (5 or 9 digits)
    pub const US_ZIP: &str = r"^[0-9]{5}(-[0-9]{4})?$";
    /// Positive integer
    pub const POSITIVE_INTEGER: &str = r"^[1-9][0-9]*$";
    /// Non-negative integer
    pub const NON_NEGATIVE_INTEGER: &str = r"^(0|[1-9][0-9]*)$";
    /// Decimal number
    pub const DECIMAL: &str = r"^-?[0-9]+(\.[0-9]+)?$";
    /// Date in ISO format (YYYY-MM-DD)
    pub const DATE_ISO: &str = r"^[0-9]{4}-[0-9]{2}-[0-9]{2}$";
    /// Date in US format (MM/DD/YYYY)
    pub const DATE_US: &str = r"^[0-9]{2}/[0-9]{2}/[0-9]{4}$";
    /// Alphabetic only
    pub const ALPHA: &str = r"^[a-zA-Z]+$";
    /// Alphanumeric only
    pub const ALPHANUMERIC: &str = r"^[a-zA-Z0-9]+$";
    /// No whitespace
    pub const NO_WHITESPACE: &str = r"^\S+$";
    /// Credit card number (basic, 13-19 digits)
    pub const CREDIT_CARD: &str = r"^[0-9]{13,19}$";
    /// Social Security Number (XXX-XX-XXXX)
    pub const SSN: &str = r"^[0-9]{3}-[0-9]{2}-[0-9]{4}$";
}