#include "eager_search.h"
#include "search_common.h"

#include "../option_parser.h"
#include "../plugin.h"

using namespace std;

namespace plugin_eager_greedy {
static shared_ptr<SearchEngine> _parse(OptionParser &parser) {
    parser.document_synopsis("Greedy search (eager)", "");
    parser.document_note(
        "Open list",
        "In most cases, eager greedy best first search uses "
        "an alternation open list with one queue for each evaluator. "
        "If preferred operator evaluators are used, it adds an extra queue "
        "for each of these evaluators that includes only the nodes that "
        "are generated with a preferred operator. "
        "If only one evaluator and no preferred operator evaluator is used, "
        "the search does not use an alternation open list but a "
        "standard open list with only one queue.");
    parser.document_note(
        "Closed nodes",
        "Closed node are not re-opened");
    parser.document_note(
        "Equivalent statements using general eager search",
        "\n```\n--evaluator h2=eval2\n"
        "--search eager_greedy([eval1, h2], preferred=h2, boost=100)\n```\n"
        "is equivalent to\n"
        "```\n--evaluator h1=eval1 --heuristic h2=eval2\n"
        "--search eager(alt([single(h1), single(h1, pref_only=true), single(h2), \n"
        "                    single(h2, pref_only=true)], boost=100),\n"
        "               preferred=h2)\n```\n"
        "------------------------------------------------------------\n"
        "```\n--search eager_greedy([eval1, eval2])\n```\n"
        "is equivalent to\n"
        "```\n--search eager(alt([single(eval1), single(eval2)]))\n```\n"
        "------------------------------------------------------------\n"
        "```\n--evaluator h1=eval1\n"
        "--search eager_greedy(h1, preferred=h1)\n```\n"
        "is equivalent to\n"
        "```\n--evaluator h1=eval1\n"
        "--search eager(alt([single(h1), single(h1, pref_only=true)]),\n"
        "               preferred=h1)\n```\n"
        "------------------------------------------------------------\n"
        "```\n--search eager_greedy(eval1)\n```\n"
        "is equivalent to\n"
        "```\n--search eager(single(eval1))\n```\n", true);

    parser.add_list_option<shared_ptr<Evaluator>>("evals", "evaluators");
    parser.add_list_option<shared_ptr<Evaluator>>(
        "preferred",
        "use preferred operators of these evaluators", "[]");
    parser.add_option<int>(
        "boost",
        "boost value for preferred operator open lists", "0");

    eager_search::add_options_to_parser(parser);
    Options opts = parser.parse();
    opts.verify_list_non_empty<shared_ptr<Evaluator>>("evals");

    shared_ptr<eager_search::EagerSearch> engine;
    if (!parser.dry_run()) {
        opts.set("open", search_common::create_greedy_open_list_factory(opts));
        opts.set("reopen_closed", false);
        shared_ptr<Evaluator> evaluator = nullptr;
        opts.set("f_eval", evaluator);
        engine = make_shared<eager_search::EagerSearch>(opts);
    }
    return engine;
}

static Plugin<SearchEngine> _plugin("eager_greedy", _parse);
}
