const std = @import("std");
const Allocator = std.mem.Allocator;
const HTML = Parent.HTML;
const Parent = @import("Element.zig");

level: u3,
content: Parent,

const Self = @This();

pub fn init(alloc: Allocator, level: u3, content: Parent) !*Self {
    const v = try alloc.create(Self);
    v.* = .{ .level = level, .content = content };
    return v;
}

pub fn element(self: *Self) Parent {
    return .{ .ptr = self, .vtable = .{ .deinit = destroy, .html = html } };
}

pub fn deinit(self: *Self, alloc: Allocator) void {
    self.element().deinit(alloc);
}

fn destroy(context: *anyopaque, alloc: Allocator) void {
    var self: *Self = @ptrCast(@alignCast(context));
    self.content.deinit(alloc);
    alloc.destroy(self);
}

fn html(context: *anyopaque, alloc: Allocator) HTML.Error!HTML {
    const self: *Self = @ptrCast(@alignCast(context));
    var el = try HTML.init(alloc, .content, switch (self.level) {
        1 => "h1",
        2 => "h2",
        3 => "h3",
        4 => "h4",
        5 => "h5",
        6 => "h6",
        else => unreachable,
        });
    errdefer el.deinit();
    try el.appendContent(try self.content.html(alloc));
    return el;
}