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/*
 * Copyright (c) 2017 TOYOTA MOTOR CORPORATION
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <algorithm>
#include <regex>

#include "json_helper.hpp"
#include "layers.hpp"
#include "util.hpp"
#include "hmi-debug.h"

namespace wm
{

using json = nlohmann::json;

layer::layer(nlohmann::json const &j)
{
      this->role = j["role"];
      this->name = j["name"];
      this->layer_id = j["layer_id"];
      this->rect = compositor::full_rect;
      if (j["area"]["type"] == "rect")
      {
            auto jr = j["area"]["rect"];
            this->rect = compositor::rect{
                jr["width"],
                jr["height"],
                jr["x"],
                jr["y"],
            };
      }

      // Init flag of normal layout only
      this->is_normal_layout_only = true;

      auto split_layouts = j.find("split_layouts");
      if (split_layouts != j.end())
      {

            // Clear flag of normal layout only
            this->is_normal_layout_only = false;

            auto &sls = j["split_layouts"];
            // this->layouts.reserve(sls.size());
            std::transform(std::cbegin(sls), std::cend(sls),
                           std::back_inserter(this->layouts), [this](json const &sl) {
                                 struct split_layout l
                                 {
                                       sl["name"], sl["main_match"], sl["sub_match"]
                                 };
                                 HMI_DEBUG("wm",
                                           "layer %d add split_layout \"%s\" (main: \"%s\") (sub: "
                                           "\"%s\")",
                                           this->layer_id,
                                           l.name.c_str(), l.main_match.c_str(),
                                           l.sub_match.c_str());
                                 return l;
                           });
      }
      HMI_DEBUG("wm", "layer_id:%d is_normal_layout_only:%d\n",
                this->layer_id, this->is_normal_layout_only);
}

struct result<struct layer_map> to_layer_map(nlohmann::json const &j)
{
      try
      {
            layer_map stl{};
            auto m = j["mappings"];

            std::transform(std::cbegin(m), std::cend(m),
                           std::inserter(stl.mapping, stl.mapping.end()),
                           [](nlohmann::json const &j) {
                                 return std::pair<int, struct layer>(
                                     j.value("layer_id", -1), layer(j));
                           });

            // TODO: add sanity checks here?
            // * check for double IDs
            // * check for double names/roles

            stl.layers.reserve(m.size());
            std::transform(std::cbegin(stl.mapping), std::cend(stl.mapping),
                           std::back_inserter(stl.layers),
                           [&stl](std::pair<int, struct layer> const &k) {
                                 stl.roles.emplace_back(
                                     std::make_pair(k.second.role, k.second.layer_id));
                                 return unsigned(k.second.layer_id);
                           });

            std::sort(stl.layers.begin(), stl.layers.end());

            for (auto i : stl.mapping)
            {
                  if (i.second.name.empty())
                  {
                        return Err<struct layer_map>("Found mapping w/o name");
                  }
                  if (i.second.layer_id == -1)
                  {
                        return Err<struct layer_map>("Found invalid/unset IDs in mapping");
                  }
            }

            auto msi = j.find("main_surface");
            if (msi != j.end())
            {
                  stl.main_surface_name = msi->value("surface_role", "");
                  stl.main_surface = -1;
            }

            return Ok(stl);
      }
      catch (std::exception &e)
      {
            return Err<struct layer_map>(e.what());
      }
}

optional<int>
layer_map::get_layer_id(int surface_id)
{
      auto i = this->surfaces.find(surface_id);
      if (i != this->surfaces.end())
      {
            return optional<int>(i->second);
      }
      return nullopt;
}

optional<int> layer_map::get_layer_id(std::string const &role)
{
      for (auto const &r : this->roles)
      {
            auto re = std::regex(r.first);
            if (std::regex_match(role, re))
            {
                  HMI_DEBUG("wm", "role %s matches layer %d", role.c_str(), r.second);
                  return optional<int>(r.second);
            }
      }
      HMI_DEBUG("wm", "role %s does NOT match any layer", role.c_str());
      return nullopt;
}

json layer::to_json() const
{
      auto is_full = this->rect == compositor::full_rect;

      json r{};
      if (is_full)
      {
            r = {{"type", "full"}};
      }
      else
      {
            r = {{"type", "rect"},
                 {"rect",
                  {{"x", this->rect.x},
                   {"y", this->rect.y},
                   {"width", this->rect.w},
                   {"height", this->rect.h}}}};
      }

      return {
          {"name", this->name},
          {"role", this->role},
          {"layer_id", this->layer_id},
          {"area", r},
      };
}

json layer_map::to_json() const
{
      json j{};
      for (auto const &i : this->mapping)
      {
            j.push_back(i.second.to_json());
      }
      return j;
}

} // namespace wm