//! Scrollbar element characters.
//!
//! Provides character sets for drawing scrollbars with different styles.

const std = @import("std");
const line = @import("line.zig");
const block = @import("block.zig");

// ============================================================================
// Scrollbar Set
// ============================================================================

/// A set of characters for drawing a scrollbar.
/// ```
/// <--▮------->
/// ^  ^   ^   ^
/// │  │   │   └ end
/// │  │   └──── track
/// │  └──────── thumb
/// └─────────── begin
/// ```
pub const Set = struct {
    track: []const u8,
    thumb: []const u8,
    begin: []const u8,
    end: []const u8,

    pub const default: Set = VERTICAL;
};

/// Vertical scrollbar with arrows.
/// ```
/// ↑
/// │
/// █
/// │
/// ↓
/// ```
pub const VERTICAL: Set = .{
    .track = line.VERTICAL,
    .thumb = block.FULL,
    .begin = "↑",
    .end = "↓",
};

/// Horizontal scrollbar with arrows.
/// ```
/// ←───█───→
/// ```
pub const HORIZONTAL: Set = .{
    .track = line.HORIZONTAL,
    .thumb = block.FULL,
    .begin = "←",
    .end = "→",
};

/// Vertical scrollbar with double line track.
pub const DOUBLE_VERTICAL: Set = .{
    .track = line.DOUBLE_VERTICAL,
    .thumb = block.FULL,
    .begin = "▲",
    .end = "▼",
};

/// Horizontal scrollbar with double line track.
pub const DOUBLE_HORIZONTAL: Set = .{
    .track = line.DOUBLE_HORIZONTAL,
    .thumb = block.FULL,
    .begin = "◄",
    .end = "►",
};

// ============================================================================
// Tests
// ============================================================================

test "scrollbar set default" {
    try std.testing.expectEqualStrings(line.VERTICAL, Set.default.track);
    try std.testing.expectEqualStrings(block.FULL, Set.default.thumb);
}