#include "log_panel.hpp"

#include <cstdio>

#include "imgui.h"

#include "injection_panel.hpp"
#include "ui/app_chrome.hpp"
#include "ui/text_match.hpp"

namespace coop {

void LogPanel::add_line(const LogRecord& rec)
{
	if (first_millis_ == 0) {
		first_millis_ = rec.millis;
	}
	const double secs = static_cast<double>(rec.millis - first_millis_) / 1000.0;

	char buf[256];
	std::snprintf(buf, sizeof(buf), "[%8.3f] %s", secs, rec.text);
	lines_.push_back({buf, rec.level});
	while (lines_.size() > kMaxLines) {
		lines_.pop_front();
	}
}

void LogPanel::pull(InjectionPanel& injection)
{
	injection.drain_logs([this](const LogRecord& rec) { add_line(rec); });
}

void LogPanel::draw()
{
	apply_panel_layout(Panel::Log);
	ImGui::Begin("Log");

	if (ImGui::Button("Clear")) {
		lines_.clear();
		first_millis_ = 0;
	}
	ImGui::SameLine();
	ImGui::Checkbox("Auto-scroll", &autoscroll_);
	ImGui::SameLine();
	ImGui::SetNextItemWidth(-1.0f);
	ImGui::InputTextWithHint("##logfilter", "filter...", filter_, sizeof(filter_));

	ImGui::Separator();
	if (ImGui::BeginChild("loglines", ImVec2(0, 0), ImGuiChildFlags_None, ImGuiWindowFlags_HorizontalScrollbar)) {
		const bool has_filter = filter_[0] != '\0';
		for (const Line& line : lines_) {
			if (has_filter && !contains_ci(line.text, filter_)) {
				continue;
			}
			switch (line.level) {
			case LogLevel_Warn:
				ImGui::TextColored(ImVec4(1.0f, 0.8f, 0.3f, 1.0f), "%s", line.text.c_str()); // amber
				break;
			case LogLevel_Error:
				ImGui::TextColored(ImVec4(1.0f, 0.45f, 0.4f, 1.0f), "%s", line.text.c_str()); // red
				break;
			default:
				ImGui::TextUnformatted(line.text.c_str());
				break;
			}
		}
		// Stick to the bottom while new lines arrive (unless the user scrolled up).
		if (autoscroll_ && ImGui::GetScrollY() >= ImGui::GetScrollMaxY() - 1.0f) {
			ImGui::SetScrollHereY(1.0f);
		}
	}
	ImGui::EndChild();

	ImGui::End();
}

} // namespace coop