#include <itemview_formaction.h>
#include <view.h>
#include <config.h>
#include <logger.h>
#include <exceptions.h>
#include <utils.h>
#include <strprintf.h>
#include <formatstring.h>
#include <textformatter.h>
#include <cstring>

#include <sstream>
#include <algorithm>

namespace newsbeuter {

itemview_formaction::itemview_formaction(view * vv, std::shared_ptr<itemlist_formaction> il, std::string formstr)
	: formaction(vv,formstr), show_source(false), quit(false), rxman(0), num_lines(0), itemlist(il), in_search(false) {
	valid_cmds.push_back("save");
	std::sort(valid_cmds.begin(), valid_cmds.end());
}

itemview_formaction::~itemview_formaction() { }


void itemview_formaction::init() {
	f->set("msg","");
	do_redraw = true;
	quit = false;
	links.clear();
	num_lines = 0;
	if (!v->get_cfg()->get_configvalue_as_bool("display-article-progress")) {
		f->set("percentwidth", "0");
	} else {
		f->set("percentwidth", std::to_string(utils::max(6, utils::max(strlen(_("Top")), strlen(_("Bottom"))))));
		update_percent();
	}
	set_keymap_hints();
}

void itemview_formaction::prepare() {
	/*
	 * whenever necessary, the item view is regenerated. This is done
	 * by putting together the feed name, title, link, author, optional
	 * flags and podcast download URL (enclosures) and then render the
	 * HTML. The links extracted by the renderer are then appended, too.
	 */
	if (do_redraw) {

		{
			scope_measure("itemview::prepare: rendering");
			f->run(-3); // XXX HACK: render once so that we get a proper widget width
		}

		std::shared_ptr<rss_item> item = feed->get_item_by_guid(guid);
		textformatter textfmt;

		std::shared_ptr<rss_feed> feedptr = item->get_feedptr();

		std::string feedtitle, feedheader;
		if (feedptr.get() != nullptr) {
			if (feedptr->title().length() > 0) {
				feedtitle = feedptr->title();
				utils::remove_soft_hyphens(feedtitle);
			} else if (feedptr->link().length() > 0) {
				feedtitle = feedptr->link();
			} else if (feedptr->rssurl().length() > 0) {
				feedtitle = feedptr->rssurl();
			}
		}
		if (feedtitle.length() > 0) {
			feedheader = strprintf::fmt("%s%s", _("Feed: "), feedtitle);
			textfmt.add_line(LineType::wrappable, feedheader);
		}

		if (item->title().length() > 0) {
			std::string title = strprintf::fmt("%s%s", _("Title: "), item->title());
			utils::remove_soft_hyphens(title);
			textfmt.add_line(LineType::wrappable, title);
		}

		if (item->author().length() > 0) {
			std::string author = strprintf::fmt("%s%s", _("Author: "), item->author());
			utils::remove_soft_hyphens(author);
			textfmt.add_line(LineType::wrappable, author);
		}

		if (item->link().length() > 0) {
			std::string link = strprintf::fmt("%s%s", _("Link: "), utils::censor_url(item->link()));
			textfmt.add_line(LineType::softwrappable, link);
		}

		std::string date = strprintf::fmt("%s%s", _("Date: "), item->pubDate());
		textfmt.add_line(LineType::wrappable, date);

		if (item->flags().length() > 0) {
			std::string flags = strprintf::fmt("%s%s", _("Flags: "), item->flags());
			textfmt.add_line(LineType::wrappable, flags);
		}

		if (item->enclosure_url().length() > 0) {
			std::string enc_url = strprintf::fmt("%s%s", _("Podcast Download URL: "), utils::censor_url(item->enclosure_url()));
			if (item->enclosure_type() != "") {
				enc_url.append(strprintf::fmt(" (%s%s)",  _("type: "), item->enclosure_type()));
			}
			textfmt.add_line(LineType::softwrappable, enc_url);
		}

		textfmt.add_line(LineType::wrappable, std::string());

		unsigned int unread_item_count = feed->unread_item_count();
		// we need to subtract because the current item isn't yet marked as read
		if (item->unread())
			unread_item_count--;
		set_head(item->title(), feedtitle, unread_item_count, feed->total_item_count());

		std::vector<std::pair<LineType, std::string>> lines;
		if (show_source) {
			render_source(lines, utils::quote_for_stfl(item->description()));
		} else {
			std::string baseurl = item->get_base() != "" ? item->get_base() : item->feedurl();
			lines = render_html(item->description(), links, baseurl);
		}

		textfmt.add_lines(lines);

		std::string widthstr = f->get("article:w");
		unsigned int window_width = utils::to_u(widthstr, 0);

		unsigned int textwidth = v->get_cfg()->get_configvalue_as_int("text-width");
		if (textwidth == 0) {
			textwidth = window_width;
			if (textwidth - 5 > 0) {
				textwidth -= 5;
			}
		}

		std::string formatted_text;
		std::tie(formatted_text, num_lines) = textfmt.format_text_to_list(
				rxman, "article", textwidth, window_width);
		f->modify("article", "replace_inner", formatted_text);
		f->set("articleoffset","0");

		if (in_search) {
			rxman->remove_last_regex("article");
			in_search = false;
		}

		do_redraw = false;
	}

}

void itemview_formaction::process_operation(operation op, bool automatic, std::vector<std::string> * args) {
	std::shared_ptr<rss_item> item = feed->get_item_by_guid(guid);
	bool hardquit = false;

	/*
	 * whenever we process an operation, we mark the item
	 * as read. Don't worry: when an item is already marked as
	 * read, and then marked as read again, no database update
	 * is done, since only _changes_ to the unread flag are
	 * recorded in the database.
	 */
	try {
		bool old_unread = item->unread();
		item->set_unread(false);
		if (old_unread) {
			v->get_ctrl()->mark_article_read(item->guid(), true);
		}
	} catch (const dbexception& e) {
		v->show_error(strprintf::fmt(_("Error while marking article as read: %s"), e.what()));
	}

	switch (op) {
	case OP_TOGGLESOURCEVIEW:
		LOG(level::INFO, "view::run_itemview: toggling source view");
		show_source = !show_source;
		do_redraw = true;
		break;
	case OP_ENQUEUE: {
		if (item->enclosure_url().length() > 0 && utils::is_http_url(item->enclosure_url())) {
			v->get_ctrl()->enqueue_url(item->enclosure_url(), feed);
			v->set_status(strprintf::fmt(_("Added %s to download queue."), item->enclosure_url()));
		} else {
			v->set_status(strprintf::fmt(_("Invalid URL: '%s'"), item->enclosure_url()));
		}
	}
	break;
	case OP_SAVE: {
		LOG(level::INFO, "view::run_itemview: saving article");
		std::string filename;
		if (automatic) {
			if (args->size() > 0)
				filename = (*args)[0];
		} else {
			filename = v->run_filebrowser(v->get_filename_suggestion(item->title()));
		}
		if (filename == "") {
			v->show_error(_("Aborted saving."));
		} else {
			try {
				v->get_ctrl()->write_item(item, filename);
				v->show_error(strprintf::fmt(_("Saved article to %s."), filename));
			} catch (...) {
				v->show_error(strprintf::fmt(_("Error: couldn't write article to file %s"), filename));
			}
		}
	}
	break;
	case OP_OPENINBROWSER:
		LOG(level::INFO, "view::run_itemview: starting browser");
		v->set_status(_("Starting browser..."));
		v->open_in_browser(item->link());
		v->set_status("");
		break;
	case OP_BOOKMARK:
		if (automatic) {
			qna_responses.clear();
			qna_responses.push_back(item->link());
			qna_responses.push_back(item->title());
			qna_responses.push_back(args->size() > 0 ? (*args)[0] : "");
			qna_responses.push_back(feed->title());
		} else {
			this->start_bookmark_qna(
					item->title(), item->link(), "", feed->title());
		}
		break;
	case OP_SEARCH: {
		std::vector<qna_pair> qna;
		if (automatic) {
			if (args->size() > 0) {
				qna_responses.clear();
				qna_responses.push_back((*args)[0]);
				finished_qna(OP_INT_START_SEARCH);
			}
		} else {
			qna.push_back(qna_pair(_("Search for: "), ""));
			this->start_qna(qna, OP_INT_START_SEARCH, &searchhistory);
		}
	}
	break;
	case OP_PIPE_TO: {
		std::vector<qna_pair> qna;
		if (automatic) {
			if (args->size() > 0) {
				qna_responses.clear();
				qna_responses.push_back((*args)[0]);
				finished_qna(OP_PIPE_TO);
			}
		} else {
			qna.push_back(qna_pair(_("Pipe article to command: "), ""));
			this->start_qna(qna, OP_PIPE_TO, &cmdlinehistory);
		}
	}
	break;
	case OP_EDITFLAGS:
		if (automatic) {
			qna_responses.clear();
			if (args->size() > 0) {
				qna_responses.push_back((*args)[0]);
				this->finished_qna(OP_INT_EDITFLAGS_END);
			}
		} else {
			std::vector<qna_pair> qna;
			qna.push_back(qna_pair(_("Flags: "), item->flags()));
			this->start_qna(qna, OP_INT_EDITFLAGS_END);
		}
		break;
	case OP_SHOWURLS: {
		std::string urlviewer = v->get_cfg()->get_configvalue("external-url-viewer");
		LOG(level::DEBUG, "view::run_itemview: showing URLs");
		if (urlviewer == "") {
			if (links.size() > 0) {
				v->push_urlview(links, feed);
			} else {
				v->show_error(_("URL list empty."));
			}
		} else {
			qna_responses.clear();
			qna_responses.push_back(urlviewer);
			this->finished_qna(OP_PIPE_TO);
		}
	}
	break;
	case OP_DELETE:
		LOG(level::INFO, "view::run_itemview: deleting current article");
		item->set_deleted(true);
		v->get_ctrl()->mark_deleted(guid, true);
	/* fall-through! */
	case OP_NEXTUNREAD:
		LOG(level::INFO, "view::run_itemview: jumping to next unread article");
		if (v->get_next_unread(itemlist.get(), this)) {
			do_redraw = true;
		} else {
			v->pop_current_formaction();
			v->show_error(_("No unread items."));
		}
		break;
	case OP_PREVUNREAD:
		LOG(level::INFO, "view::run_itemview: jumping to previous unread article");
		if (v->get_previous_unread(itemlist.get(), this)) {
			do_redraw = true;
		} else {
			v->pop_current_formaction();
			v->show_error(_("No unread items."));
		}
		break;
	case OP_NEXT:
		LOG(level::INFO, "view::run_itemview: jumping to next article");
		if (v->get_next(itemlist.get(), this)) {
			do_redraw = true;
		} else {
			v->pop_current_formaction();
			v->show_error(_("Already on last item."));
		}
		break;
	case OP_PREV:
		LOG(level::INFO, "view::run_itemview: jumping to previous article");
		if (v->get_previous(itemlist.get(), this)) {
			do_redraw = true;
		} else {
			v->pop_current_formaction();
			v->show_error(_("Already on first item."));
		}
		break;
	case OP_RANDOMUNREAD:
		LOG(level::INFO, "view::run_itemview: jumping to random unread article");
		if (v->get_random_unread(itemlist.get(), this)) {
			do_redraw = true;
		} else {
			v->pop_current_formaction();
			v->show_error(_("No unread items."));
		}
		break;
	case OP_TOGGLEITEMREAD:
		LOG(level::INFO, "view::run_itemview: setting unread and quitting");
		v->set_status(_("Toggling read flag for article..."));
		try {
			item->set_unread(true);
			v->get_ctrl()->mark_article_read(item->guid(), false);
		} catch (const dbexception& e) {
			v->show_error(strprintf::fmt(_("Error while marking article as unread: %s"), e.what()));
		}
		v->set_status("");
		quit = true;
		break;
	case OP_QUIT:
		LOG(level::INFO, "view::run_itemview: quitting");
		quit = true;
		break;
	case OP_HARDQUIT:
		LOG(level::INFO, "view::run_itemview: hard quitting");
		hardquit = true;
		break;
	case OP_HELP:
		v->push_help();
		break;
	case OP_1:
	case OP_2:
	case OP_3:
	case OP_4:
	case OP_5:
	case OP_6:
	case OP_7:
	case OP_8:
	case OP_9:
	case OP_0: {
		unsigned int idx = op - OP_1;
		LOG(level::DEBUG, "itemview::run: OP_1 = %d op = %d idx = %u", OP_1, op, idx);
		if (idx < links.size()) {
			v->set_status(_("Starting browser..."));
			v->open_in_browser(links[idx].first);
			v->set_status("");
		}
	}
	break;
	case OP_GOTO_URL: {
		std::vector<qna_pair> qna;
		if (automatic) {
			if (args->size() > 0) {
				qna_responses.clear();
				qna_responses.push_back((*args)[0]);
				finished_qna(OP_INT_GOTO_URL);
			}
		} else {
			qna.push_back(qna_pair(_("Goto URL #"), ""));
			this->start_qna(qna, OP_INT_GOTO_URL);
		}
	}
	break;
	default:
		break;
	}

	if (hardquit) {
		while (v->formaction_stack_size() > 0) {
			v->pop_current_formaction();
		}
	} else if (quit) {
		v->pop_current_formaction();
	}

}

keymap_hint_entry * itemview_formaction::get_keymap_hint() {
	static keymap_hint_entry hints[] = {
		{ OP_QUIT, _("Quit") },
		{ OP_SAVE, _("Save") },
		{ OP_NEXTUNREAD, _("Next Unread") },
		{ OP_OPENINBROWSER, _("Open in Browser") },
		{ OP_ENQUEUE, _("Enqueue") },
		{ OP_HELP, _("Help") },
		{ OP_NIL, nullptr }
	};
	return hints;
}

void itemview_formaction::set_head(const std::string& s, const std::string& feedtitle, unsigned int unread, unsigned int total) {
	fmtstr_formatter fmt;
	fmt.register_fmt('N', PROGRAM_NAME);
	fmt.register_fmt('V', PROGRAM_VERSION);

	auto itemtitle = s;
	utils::remove_soft_hyphens(itemtitle);
	fmt.register_fmt('T', itemtitle);

	auto clear_feedtitle = feedtitle;
	utils::remove_soft_hyphens(clear_feedtitle);
	fmt.register_fmt('F', clear_feedtitle);

	fmt.register_fmt('u', std::to_string(unread));
	fmt.register_fmt('t', std::to_string(total));

	std::string listwidth = f->get("article:w");
	unsigned int width = utils::to_u(listwidth);

	f->set("head",fmt.do_format(v->get_cfg()->get_configvalue("itemview-title-format"), width));
}

void itemview_formaction::render_source(
		std::vector<std::pair<LineType, std::string>>& lines,
		std::string source)
{
	/*
	 * This function is called instead of htmlrenderer::render() when the
	 * user requests to have the source displayed instead of seeing the
	 * rendered HTML.
	 */
	std::string line;
	do {
		std::string::size_type pos = source.find_first_of("\r\n");
		line = source.substr(0, pos);
		if (pos == std::string::npos)
			source.erase();
		else
			source.erase(0, pos+1);
		lines.push_back(std::make_pair(LineType::softwrappable, line));
	} while (source.length() > 0);
}

void itemview_formaction::handle_cmdline(const std::string& cmd) {
	std::vector<std::string> tokens = utils::tokenize_quoted(cmd);
	if (!tokens.empty()) {
		if (tokens[0] == "save" && tokens.size() >= 2) {
			std::string filename = utils::resolve_tilde(tokens[1]);
			std::shared_ptr<rss_item> item = feed->get_item_by_guid(guid);

			if (filename == "") {
				v->show_error(_("Aborted saving."));
			} else {
				try {
					v->get_ctrl()->write_item(item, filename);
					v->show_error(strprintf::fmt(_("Saved article to %s"), filename));
				} catch (...) {
					v->show_error(strprintf::fmt(_("Error: couldn't save article to %s"), filename));
				}
			}

		} else {
			formaction::handle_cmdline(cmd);
		}
	}
}

void itemview_formaction::finished_qna(operation op) {
	formaction::finished_qna(op); // important!

	std::shared_ptr<rss_item> item = feed->get_item_by_guid(guid);

	switch (op) {
	case OP_INT_EDITFLAGS_END:
		item->set_flags(qna_responses[0]);
		v->get_ctrl()->update_flags(item);
		v->set_status(_("Flags updated."));
		do_redraw = true;
		break;
	case OP_INT_START_SEARCH:
		do_search();
		break;
	case OP_PIPE_TO: {
		std::string cmd = qna_responses[0];
		std::ostringstream ostr;
		v->get_ctrl()->write_item(feed->get_item_by_guid(guid), ostr);
		v->push_empty_formaction();
		stfl::reset();
		FILE * f = popen(cmd.c_str(), "w");
		if (f) {
			std::string data = ostr.str();
			fwrite(data.c_str(), data.length(), 1, f);
			pclose(f);
		}
		v->pop_current_formaction();
	}
	break;
	case OP_INT_GOTO_URL: {
		unsigned int idx = 0;
		sscanf(qna_responses[0].c_str(),"%u",&idx);
		if (idx && idx-1 < links.size()) {
			v->set_status(_("Starting browser..."));
			v->open_in_browser(links[idx-1].first);
			v->set_status("");
		}
	}
	break;
	default:
		break;
	}
}

std::vector<std::pair<LineType, std::string>>
	itemview_formaction::render_html(
		const std::string& source,
		std::vector<linkpair>& thelinks,
		const std::string& url)
{
	std::vector<std::pair<LineType, std::string>> result;
	std::string renderer = v->get_cfg()->get_configvalue("html-renderer");
	if (renderer == "internal") {
		htmlrenderer rnd;
		rnd.render(source, result, thelinks, url);
	} else {
		char * argv[4];
		argv[0] = const_cast<char *>("/bin/sh");
		argv[1] = const_cast<char *>("-c");
		argv[2] = const_cast<char *>(renderer.c_str());
		argv[3] = nullptr;
		LOG(level::DEBUG, "itemview_formaction::render_html: source = %s", source);
		LOG(level::DEBUG, "itemview_formaction::render_html: html-renderer = %s", argv[2]);

		std::string output = utils::run_program(argv, source);
		std::istringstream is(output);
		std::string line;
		getline(is, line);
		while (!is.eof()) {
			result.push_back(std::make_pair(LineType::softwrappable, utils::quote_for_stfl(line)));
			getline(is, line);
		}
	}
	return result;
}

void itemview_formaction::set_regexmanager(regexmanager * r) {
	rxman = r;
	std::vector<std::string>& attrs = r->get_attrs("article");
	unsigned int i=0;
	std::string attrstr;
	for (auto attribute : attrs) {
		attrstr.append(strprintf::fmt("@style_%u_normal:%s ", i, attribute));
		i++;
	}
	attrstr.append("@style_b_normal[color_bold]:attr=bold @style_u_normal[color_underline]:attr=underline ");
	std::string textview = strprintf::fmt("{textview[article] style_normal[article]: style_end[styleend]:fg=blue,attr=bold %s .expand:vh offset[articleoffset]:0 richtext:1}", attrstr);
	f->modify("article", "replace", textview);
}

void itemview_formaction::update_percent() {
	if (v->get_cfg()->get_configvalue_as_bool("display-article-progress")) {
		unsigned int percent = 0;
		unsigned int offset = utils::to_u(f->get("articleoffset"), 0);

		if (num_lines > 0)
			percent = (100 * (offset + 1)) / num_lines;
		else
			percent = 0;

		LOG(level::DEBUG, "itemview_formaction::update_percent: offset = %u num_lines = %u percent = %u", offset, num_lines, percent);

		if (offset == 0 || percent == 0) {
			f->set("percent", _("Top"));
		} else if (offset == (num_lines - 1)) {
			f->set("percent", _("Bottom"));
		} else {
			f->set("percent", strprintf::fmt("%3u %% ", percent));
		}
	}
}

std::string itemview_formaction::title() {
	std::shared_ptr<rss_item> item = feed->get_item_by_guid(guid);
	auto title = item->title();
	utils::remove_soft_hyphens(title);
	return strprintf::fmt(_("Article - %s"), title);
}

void itemview_formaction::set_highlightphrase(const std::string& text) {
	highlight_text(text);
}

void itemview_formaction::do_search() {
	std::string searchphrase = qna_responses[0];
	if (searchphrase.length() == 0)
		return;

	searchhistory.add_line(searchphrase);

	LOG(level::DEBUG, "itemview_formaction::do_search: searchphrase = %s", searchphrase);

	highlight_text(searchphrase);
}

void itemview_formaction::highlight_text(const std::string& searchphrase) {
	std::vector<std::string> params;
	params.push_back("article");
	params.push_back(searchphrase);

	std::vector<std::string> colors = utils::tokenize(v->get_cfg()->get_configvalue("search-highlight-colors"), " ");
	std::copy(colors.begin(), colors.end(), std::back_inserter(params));

	try {
		rxman->handle_action("highlight", params);

		LOG(level::DEBUG, "itemview_formaction::highlight_text: configuration manipulation was successful");

		set_regexmanager(rxman);

		in_search = true;
		do_redraw = true;
	} catch (const confighandlerexception& e) {
		LOG(level::ERROR, "itemview_formaction::highlight_text: handle_action failed, error = %s", e.what());
		v->show_error(_("Error: invalid regular expression!"));
	}
}

}