//! Border character sets. Field defaults are the normal (light box-drawing)
//! border, so `Border{}` == [normal]. The `middle*` fields are used by grid
//! layouts such as tables; [Style] rendering reads only the edges and corners.

const expectEqualStrings = @import("std").testing.expectEqualStrings;
const Border = @This();

top: []const u8 = "─",
bottom: []const u8 = "─",
left: []const u8 = "│",
right: []const u8 = "│",
top_left: []const u8 = "┌",
top_right: []const u8 = "┐",
bottom_left: []const u8 = "└",
bottom_right: []const u8 = "┘",
middle_left: []const u8 = "├",
middle_right: []const u8 = "┤",
middle: []const u8 = "┼",
middle_top: []const u8 = "┬",
middle_bottom: []const u8 = "┴",

/// Standard light border with 90° corners (lipgloss `NormalBorder`).
pub const normal: Border = .{};

/// Light border with rounded corners (lipgloss `RoundedBorder`).
pub const rounded: Border = .{
    .top_left = "╭",
    .top_right = "╮",
    .bottom_left = "╰",
    .bottom_right = "╯",
};

/// Heavy-weight border (lipgloss `ThickBorder`).
pub const thick: Border = .{
    .top = "━",
    .bottom = "━",
    .left = "┃",
    .right = "┃",
    .top_left = "┏",
    .top_right = "┓",
    .bottom_left = "┗",
    .bottom_right = "┛",
    .middle_left = "┣",
    .middle_right = "┫",
    .middle = "╋",
    .middle_top = "┳",
    .middle_bottom = "┻",
};

/// Double-stroke border (lipgloss `DoubleBorder`).
pub const double: Border = .{
    .top = "═",
    .bottom = "═",
    .left = "║",
    .right = "║",
    .top_left = "╔",
    .top_right = "╗",
    .bottom_left = "╚",
    .bottom_right = "╝",
    .middle_left = "╠",
    .middle_right = "╣",
    .middle = "╬",
    .middle_top = "╦",
    .middle_bottom = "╩",
};

/// Solid block border occupying the whole frame (lipgloss `BlockBorder`).
pub const block: Border = .{
    .top = "█",
    .bottom = "█",
    .left = "█",
    .right = "█",
    .top_left = "█",
    .top_right = "█",
    .bottom_left = "█",
    .bottom_right = "█",
    .middle_left = "█",
    .middle_right = "█",
    .middle = "█",
    .middle_top = "█",
    .middle_bottom = "█",
};

/// Half-block border that sits outside the frame (lipgloss
/// `OuterHalfBlockBorder`). Has no middle pieces.
pub const outer_half_block: Border = .{
    .top = "▀",
    .bottom = "▄",
    .left = "▌",
    .right = "▐",
    .top_left = "▛",
    .top_right = "▜",
    .bottom_left = "▙",
    .bottom_right = "▟",
    .middle_left = "",
    .middle_right = "",
    .middle = "",
    .middle_top = "",
    .middle_bottom = "",
};

/// Half-block border that sits inside the frame (lipgloss
/// `InnerHalfBlockBorder`). Has no middle pieces.
pub const inner_half_block: Border = .{
    .top = "▄",
    .bottom = "▀",
    .left = "▐",
    .right = "▌",
    .top_left = "▗",
    .top_right = "▖",
    .bottom_left = "▝",
    .bottom_right = "▘",
    .middle_left = "",
    .middle_right = "",
    .middle = "",
    .middle_top = "",
    .middle_bottom = "",
};

/// ASCII-only border (lipgloss `ASCIIBorder`).
pub const ascii: Border = .{
    .top = "-",
    .bottom = "-",
    .left = "|",
    .right = "|",
    .top_left = "+",
    .top_right = "+",
    .bottom_left = "+",
    .bottom_right = "+",
    .middle_left = "+",
    .middle_right = "+",
    .middle = "+",
    .middle_top = "+",
    .middle_bottom = "+",
};

/// Markdown-table border (lipgloss `MarkdownBorder`). Disable the top and
/// bottom edges for valid markdown output.
pub const markdown: Border = .{
    .top = "-",
    .bottom = "-",
    .left = "|",
    .right = "|",
    .top_left = "|",
    .top_right = "|",
    .bottom_left = "|",
    .bottom_right = "|",
    .middle_left = "|",
    .middle_right = "|",
    .middle = "|",
    .middle_top = "|",
    .middle_bottom = "|",
};

/// Blank border of single-cell spaces — keeps layout positioning without a
/// visible border (lipgloss `HiddenBorder`).
pub const hidden: Border = .{
    .top = " ",
    .bottom = " ",
    .left = " ",
    .right = " ",
    .top_left = " ",
    .top_right = " ",
    .bottom_left = " ",
    .bottom_right = " ",
    .middle_left = " ",
    .middle_right = " ",
    .middle = " ",
    .middle_top = " ",
    .middle_bottom = " ",
};

test "predefined border edges and corners" {
    try expectEqualStrings("─", normal.top);
    try expectEqualStrings("╭", rounded.top_left);
    try expectEqualStrings("┃", thick.left);
    try expectEqualStrings("═", double.top);
    try expectEqualStrings("+", ascii.top_left);
    try expectEqualStrings("█", block.top_left);
    try expectEqualStrings("▀", outer_half_block.top);
    try expectEqualStrings("▄", inner_half_block.top);
    try expectEqualStrings("|", markdown.top_left);
    try expectEqualStrings(" ", hidden.bottom_right);
}

test "predefined border middle pieces" {
    try expectEqualStrings("┼", normal.middle);
    try expectEqualStrings("┼", rounded.middle); // rounded inherits normal middles
    try expectEqualStrings("╋", thick.middle);
    try expectEqualStrings("╬", double.middle);
    try expectEqualStrings("+", ascii.middle_top);
    try expectEqualStrings("█", block.middle);
    try expectEqualStrings("|", markdown.middle);
    try expectEqualStrings(" ", hidden.middle);
    try expectEqualStrings("", outer_half_block.middle);
    try expectEqualStrings("", inner_half_block.middle_left);
}