#include "statusline.hpp"

#include <fmt/color.h>
#include <range/v3/view/iota.hpp>
#include <utility>

#include "engine/data/vector2.hpp"
#include "interfaces/matrix.hpp"

StatusLine::StatusLine(std::shared_ptr<ComponentMatrix> component_matrix) noexcept
	: _component_matrix(std::move(component_matrix)), _need_render(false)
{
	_component_matrix->fill(ComponentElement({.value = ' '}));
}

auto StatusLine::get() const noexcept -> const std::shared_ptr<ComponentMatrix> &
{
	return _component_matrix;
}

auto StatusLine::get_need_render() const noexcept -> bool
{
	return _need_render;
}

void StatusLine::set_need_render(bool need_render) noexcept
{
	_need_render = need_render;
}

auto StatusLine::get_foreground_color() const noexcept -> std::uint32_t
{
	return static_cast<std::uint32_t>(fmt::color::white);
}

auto StatusLine::get_background_color() const noexcept -> std::uint32_t
{
	return STATUSLINE_COLOR;
}

void StatusLine::set_section_status(
	StatusLineSection section,
	const std::string_view &status,
	std::int32_t start) noexcept
{
	if (status.length() == 0U)
	{
		return;
	}

	_clear_section(section, start);

	auto section_start = _get_section_start_x(section);

	auto pos = Vector2({.x = section_start + start, .y = 0});

	const auto column_cnt =
		static_cast<std::int32_t>(_component_matrix->get_column_cnt());

	const auto section_length = _section_lengths[section];

	const auto status_len = static_cast<std::int32_t>(status.length());

	const auto section_style =
		_section_styles.contains(section) ? _section_styles.at(section) : Style();

	auto is_style_applied = false;

	if (section_style.padding_left > 0U)
	{
		auto padding_remaining = section_style.padding_left;

		_component_matrix->set(pos, {.value = ' ', .style = section_style});
		padding_remaining--;

		for (auto index : ranges::views::iota(0U, padding_remaining))
		{
			pos += Vector2::right();

			_component_matrix->set(pos, {.value = ' '});
		}

		is_style_applied = true;
	}

	pos += Vector2::right();

	auto status_offset_start = 0U;

	// Apply the section style to the first status character if it hasn't
	// already been applied
	if (!is_style_applied)
	{
		_component_matrix->set(pos, {.value = status[0], .style = section_style});
		status_offset_start++;
		pos += Vector2::right();

		is_style_applied = true;
	}

	const auto final_status_length =
		status_len <= section_length ? status_len : section_length;

	_matrix_write_string(
		pos,
		status.substr(
			status_offset_start,
			static_cast<std::uint32_t>(final_status_length)));

	pos = pos.to_direction(Vector2::right(), final_status_length);

	for (auto index : ranges::views::iota(0U, section_style.padding_right))
	{
		_component_matrix->set(pos, {.value = ' '});

		pos += Vector2::right();
	}

	_component_matrix->set(pos, {.value = ' ', .style = {.reset_before = true}});

	set_need_render(true);
}

void StatusLine::set_section_length(
	StatusLineSection section,
	std::int32_t length) noexcept
{
	_section_lengths[section] = length;
}

void StatusLine::set_section_style(StatusLineSection section, const Style &style) noexcept
{
	_section_styles[section] = style;
}

void StatusLine::_matrix_write_string(
	const Vector2 &position,
	const std::string_view &str) noexcept
{
	auto working_pos = position;

	for (const auto &character : str)
	{
		_component_matrix->set(working_pos, {.value = character});

		working_pos += Vector2::right();
	}
}

auto StatusLine::_get_section_start_x(StatusLineSection section) const noexcept
	-> std::int32_t
{
	std::int32_t section_start = 0;

	auto section_index = static_cast<std::int32_t>(section);

	while (section_index > 0)
	{
		const auto prev_section = static_cast<StatusLineSection>(section_index - 1);

		section_start += static_cast<std::int32_t>(_section_lengths.at(prev_section));

		section_index--;
	}

	return section_start;
}

void StatusLine::_clear_section(StatusLineSection section, std::int32_t start) noexcept
{
	auto section_start = _get_section_start_x(section);

	auto pos = Vector2({.x = section_start + start, .y = 0});

	auto section_length = _section_lengths[section];

	for (auto index : ranges::views::iota(0, section_length - start))
	{
		_component_matrix->set(pos, ComponentElement({.value = ' '}));

		pos += Vector2::right();
	}
}