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use crate::data::aggregator::AggregatorKind;
use crate::data::expression::Expr;
use crate::types::{ColumnType, CurrencyKind};
use serde::{Deserialize, Serialize};
/// Two-state toggle for column display width (`_` key).
/// Header width (name + 2 chars padding) is the floor in both modes.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default, Serialize, Deserialize)]
pub enum ColumnWidthMode {
/// Width auto-calculated at load time (bounded, ~40 chars max, samples first 1000 rows).
#[default]
Default,
/// Fitted to full content width across all rows. Never less than the header width.
Fit,
}
/// Metadata about a single data column.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ColumnMeta {
/// Column name (from CSV header, or auto-generated)
pub name: String,
/// Inferred (or user-assigned) type of the column data
pub col_type: ColumnType,
/// Display width in characters (auto-calculated)
pub width: u16,
/// Minimum width (length of column name + 2 for type icon)
pub min_width: u16,
/// Active aggregators assigned by the user (Phase 12)
pub aggregators: Vec<AggregatorKind>,
/// Expression for computed columns (None for regular data columns)
pub expression: Option<Expr>,
/// Number of decimal places to display for numeric types
pub precision: u8,
/// Whether this column is pinned to the left
pub pinned: bool,
/// Position among unpinned columns at the time this column was pinned (for restore on unpin)
pub pin_restore_pos: Option<usize>,
/// Currency kind, used when col_type == Currency
pub currency: Option<CurrencyKind>,
/// Current width display mode (Default / Fit).
/// Old sessions that lack this field get Default.
#[serde(default)]
pub width_mode: ColumnWidthMode,
/// Width saved the first time calc_column_width runs (= load-time width).
/// Used by the Default mode to restore the original auto-calculated width.
#[serde(default)]
pub default_width: u16,
/// Whether this column is selected (zs/zu in z-prefix mode)
pub selected: bool,
/// Backup of original Datetime values before converting to Date
/// Stores formatted datetime strings for recovery
pub backup_datetime_str: Option<Vec<Option<String>>>,
}
impl ColumnMeta {
pub fn new(name: String) -> Self {
let name_w = unicode_width::UnicodeWidthStr::width(name.as_str()) as u16;
// +2: 1 separator space + 1 char for the type icon so the icon never covers the name
let min_width = name_w + 2;
Self {
name,
col_type: ColumnType::String,
min_width,
width: min_width.max(8), // default minimum 8 chars
aggregators: Vec::new(),
expression: None,
precision: 2,
pinned: false,
pin_restore_pos: None,
currency: None,
width_mode: ColumnWidthMode::Default,
default_width: 0,
selected: false,
backup_datetime_str: None,
}
}
}