/* BSD 3-Clause License
 *
 * Copyright © 2008-2022, Jice and the libtcod contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef LIBTCOD_CONTEXT_H_
#define LIBTCOD_CONTEXT_H_

#ifdef __cplusplus
#include <algorithm>
#include <array>
#include <memory>
#include <stdexcept>

#include "console_types.hpp"
#include "error.hpp"
#endif  // __cplusplus

#include "config.h"
#include "console.h"
#include "context_viewport.h"
#include "error.h"
#include "tileset.h"

struct SDL_Window;
struct SDL_Renderer;
struct SDL_Rect;
union SDL_Event;

struct TCOD_Context;  // Defined in this header later.
typedef struct TCOD_Context TCOD_Context;

/**
    A struct of parameters used to create a new context with `TCOD_context_new`.

    \rst
    .. versionadded:: 1.19
    \endrst
 */
typedef struct TCOD_ContextParams {
  /**
      Must be `TCOD_COMPILEDVERSION`.
   */
  int tcod_version;
  /**
      `window_x` and `window_y` are the starting position of the window.
      These are SDL parameters so values like `SDL_WINDOWPOS_UNDEFINED` and
      `SDL_WINDOWPOS_CENTERED` are acceptable.

      Values of zero will be converted to `SDL_WINDOWPOS_UNDEFINED` unless
      `window_xy_defined` is true.
   */
  int window_x, window_y;
  /**
      `pixel_width` and `pixel_height` are the desired size of the window in pixels.
      If these are zero then they'll be derived from `columns`, `rows`, and the `tileset`.
   */
  int pixel_width, pixel_height;
  /**
      `columns` and `rows` are the desired size of the terminal window.
      Usually you'll set either these or the pixel resolution.

      If you are setting these values from a TCOD_Console then you should set the console attribute instead.
   */
  int columns, rows;
  /**
      `renderer_type` is one of the `TCOD_renderer_t` values.
   */
  int renderer_type;
  /**
      `tileset` is an optional pointer to a tileset object.
      If this is NULL then a platform specific fallback tileset will be used.
      This fallback is known to be unreliable, but it should work well enough
      for prototyping code.
   */
  TCOD_Tileset* tileset;
  /**
      If `vsync` is true, then vertical sync will be enabled whenever possible.
      A value of true is recommended.
   */
  int vsync;
  /**
      `sdl_window_flags` is a bitfield of SDL_WindowFlags flags.
      For a window, a value of ``SDL_WINDOW_RESIZABLE`` is recommended.
      For fullscreen, a value of
      ``SDL_WINDOW_RESIZABLE | SDL_WINDOW_FULLSCREEN_DESKTOP`` is recommended.
      You should avoid the ``SDL_WINDOW_FULLSCREEN`` flag whenever possible.
   */
  int sdl_window_flags;
  /**
      `window_title` will be the title of the opened window.

      If not set then `argv[0]` will be used if available.
   */
  const char* window_title;
  /**
      The number of items in `argv`.
   */
  int argc;
  /**
      `argc` and `argv` are optional CLI parameters.
      You can pass `0` and `NULL` respectfully to ignore them.
      If unsure then you should pass the `argc` and `argv` arguments from your
      `main` function.
   */
  const char* const* argv;
  /**
      If user attention is required for the given CLI parameters then
      `cli_output` will be called with `cli_userdata` and an error or help
      message.
      If `cli_output` is NULL then it will print the message to stdout and
      terminate the program.  If `cli_output` returns normally then
      TCOD_E_REQUIRES_ATTENTION will be returned from `TCOD_context_new`.
   */
  void (*cli_output)(void* userdata, const char* output);
  /**
      This is passed to the `userdata` parameter of `cli_output` if called.
   */
  void* cli_userdata;
  /**
      If this is false then `window_x`/`window_y` parameters of zero are
      assumed to be undefined and will be changed to `SDL_WINDOWPOS_UNDEFINED`.
   */
  bool window_xy_defined;
  /***************************************************************************
      @brief A console to be used as a reference for the desired window size.
      This can set as an alternative to the columns and rows attributes.

      \rst
      .. versionadded:: 1.19
      \endrst
   */
  TCOD_Console* console;
} TCOD_ContextParams;

#ifdef __cplusplus
extern "C" {
#endif  // __cplusplus
/**
 *  Delete a rendering context.
 *  \rst
 *  .. versionadded:: 1.16
 *  \endrst
 */
TCOD_PUBLIC void TCOD_context_delete(struct TCOD_Context* renderer);
/**
 *  Create an uninitialized rendering context.
 *
 *  Used internally.
 */
TCOD_NODISCARD struct TCOD_Context* TCOD_context_new_(void);
/**
    Present a console to the screen, using a rendering context.

    `console` is the console to present, the console can be any size.

    `viewport` is the optional viewport options to use.
    This will affect the scaling of the console with the current context.
    This can be NULL to use the default options, which are to stretch the
    console to fit the screen.

    \rst
    .. versionadded:: 1.16
    \endrst
 */
TCOD_PUBLIC TCOD_Error TCOD_context_present(
    struct TCOD_Context* context, const struct TCOD_Console* console, const struct TCOD_ViewportOptions* viewport);
/**
    Convert the screen coordinates to tile coordinates for this context.

    `x` and `y` are the pointers to the screen coordinates, these will be
    converted to tile coordinates after the call to this function.

    The parameters given to the last call to `TCOD_context_present` will
    determine where the tiles are for this call.

    \rst
    .. versionadded:: 1.16
    \endrst
 */
TCOD_PUBLIC TCOD_Error TCOD_context_screen_pixel_to_tile_d(struct TCOD_Context* context, double* x, double* y);
/**
    Convert the screen coordinates to integer tile coordinates for this context.

    Save as `TCOD_context_screen_pixel_to_tile` but the inputs and results are
    integers.  This is useful if you don't need sub-tile coordinates.

    \rst
    .. versionadded:: 1.16
    \endrst
 */
TCOD_PUBLIC TCOD_Error TCOD_context_screen_pixel_to_tile_i(struct TCOD_Context* context, int* x, int* y);
/**
    Convert the pixel coordinates of SDL mouse events to the tile coordinates of the current context.

    \rst
    .. versionadded:: 1.19
    \endrst
 */
TCOD_PUBLIC TCOD_Error TCOD_context_convert_event_coordinates(struct TCOD_Context* context, union SDL_Event* event);
/**
    Save the last presented console to a PNG file.

    \rst
    .. versionadded:: 1.16
    \endrst
 */
TCOD_PUBLIC TCOD_Error TCOD_context_save_screenshot(struct TCOD_Context* context, const char* filename);
/**
    Return a pointer the SDL_Window for this context if it uses one.

    \rst
    .. versionadded:: 1.16
    \endrst
 */
TCOD_PUBLIC struct SDL_Window* TCOD_context_get_sdl_window(struct TCOD_Context* context);
/**
    Return a pointer the SDL_Renderer for this context if it uses one.

    \rst
    .. versionadded:: 1.16
    \endrst
 */
TCOD_PUBLIC struct SDL_Renderer* TCOD_context_get_sdl_renderer(struct TCOD_Context* context);
/**
    Change the active tileset for this context.

    \rst
    .. versionadded:: 1.16
    \endrst
 */
TCOD_PUBLIC TCOD_Error TCOD_context_change_tileset(struct TCOD_Context* self, TCOD_Tileset* tileset);
/**
    Return the `TCOD_renderer_t` renderer type for this context.

    Returns a negative number on error, such as `context` being NULL.

    \rst
    .. versionadded:: 1.16
    \endrst
 */
TCOD_PUBLIC int TCOD_context_get_renderer_type(struct TCOD_Context* context);
/**
    Set `columns` and `rows` to the recommended console size for this context.

    `magnification` determines the apparent size of the tiles on the output.
    Values of 0.0f or lower will default to 1.0f.

    \rst
    .. versionadded:: 1.16
    \endrst
 */
TCOD_PUBLIC TCOD_Error TCOD_context_recommended_console_size(
    struct TCOD_Context* context, float magnification, int* __restrict columns, int* __restrict rows);
/***************************************************************************
    @brief Fill `out_pixels` with a screen capture.

    @param context A non-NULL TCOD_Context object.
    @param out_pixels If NULL then width and height are filled with the output dimensions.
                      If not NULL then width and height are verified and the capture will be written out.
    @param width Pointer to fill with the expected image width.
    @param height Pointer to fill with the expected image height.
    @return A negative error value is returned on errors, otherwise returns TCOD_E_OK.

    \rst
    .. versionadded:: 1.22
    \endrst
 */
TCOD_PUBLIC TCOD_Error TCOD_context_screen_capture(
    struct TCOD_Context* __restrict context,
    TCOD_ColorRGBA* __restrict out_pixels,
    int* __restrict width,
    int* __restrict height);
/***************************************************************************
    @brief Allocate and return a screen capture.  The returned array must be freed with `free()`.

    @param context A non-NULL TCOD_Context object.
    @param width Pointer to fill with the allocated image width.
    @param height Pointer to fill with the allocated image height.
    @return An allocated array of RGBA pixels which must be manually freed.

    \rst
    .. versionadded:: 1.22
    \endrst
 */
TCOD_NODISCARD
TCOD_PUBLIC TCOD_ColorRGBA* TCOD_context_screen_capture_alloc(
    struct TCOD_Context* __restrict context, int* __restrict width, int* __restrict height);
#ifdef __cplusplus
}  // extern "C"
#endif  // __cplusplus
/**
    A rendering context for libtcod.
    \rst
    .. versionadded:: 1.16
    \endrst
 */
struct TCOD_Context {
#ifdef __cplusplus
  /**
      Return the TCOD_renderer_t value of this context which may be different
      than the one requested.
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] auto
  get_renderer_type() noexcept -> int {
    return TCOD_context_get_renderer_type(this);
  }
  /***************************************************************************
      @brief Present a console to the display with the provided viewport options.

      @param console The TCOD_Console to render.  This console can be any size.
      @param viewport The viewport options, which can change the way the console is scaled.
      \rst
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] void
  present(const TCOD_Console& console, const TCOD_ViewportOptions& viewport) {
    tcod::check_throw_error(TCOD_context_present(this, &console, &viewport));
  }
  /***************************************************************************
      @brief Present a console to the display.

      @param console The TCOD_Console to render.  This console can be any size and will be stretched to fit the window.
      \rst
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] void
  present(const TCOD_Console& console) {
    tcod::check_throw_error(TCOD_context_present(this, &console, nullptr));
  }
  /***************************************************************************
      @brief Return a non-owning pointer to the SDL_Window used by this context.

      @return A ``struct SDL_Window*`` pointer.  This will be nullptr if this context does not use an SDL window.
      \rst
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] auto
  get_sdl_window() noexcept -> struct SDL_Window* {
    return TCOD_context_get_sdl_window(this);
  }
  /***************************************************************************
      @brief Return a non-owning pointer to the SDL_Renderer used by this context.

      @return A ``struct SDL_Renderer*`` pointer.  This will be nullptr if this context does not use SDL's renderer.
      \rst
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] auto
  get_sdl_renderer() noexcept -> struct SDL_Renderer* {
    return TCOD_context_get_sdl_renderer(this);
  }
  /**
      Convert pixel coordinates to this contexts integer tile coordinates.
      \rst
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] auto
  pixel_to_tile_coordinates(const std::array<int, 2>& xy) -> std::array<int, 2> {
    std::array<int, 2> out{xy[0], xy[1]};
    tcod::check_throw_error(TCOD_context_screen_pixel_to_tile_i(this, &out[0], &out[1]));
    return out;
  }
  /**
      Convert pixel coordinates to this contexts sub-tile coordinates.
      \rst
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] auto
  pixel_to_tile_coordinates(const std::array<double, 2>& xy) -> std::array<double, 2> {
    std::array<double, 2> out{xy[0], xy[1]};
    tcod::check_throw_error(TCOD_context_screen_pixel_to_tile_d(this, &out[0], &out[1]));
    return out;
  }
  /***************************************************************************
      @brief Convert the pixel coordinates of SDL mouse events to the tile coordinates of the current context.

      @param event Any SDL_Event event.
          If the event type is compatible then its coordinates will be converted into tile coordinates.

      \rst
      .. versionadded:: 1.19
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] void
  convert_event_coordinates(SDL_Event& event) {
    tcod::check_throw_error(TCOD_context_convert_event_coordinates(this, &event));
  }
  /***************************************************************************
      @brief Save a screenshot to `filepath`.

      @param filepath The file path to save the screenshot at.
          If nullptr then a unique file name will be generated.
      \rst
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] void
  save_screenshot(const char* filepath) {
    tcod::check_throw_error(TCOD_context_save_screenshot(this, filepath));
  }
  /***************************************************************************
      @brief Save a screenshot to `filepath`.

      @param filepath The file path to save the screenshot at.
      \rst
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  [[deprecated(
      "TCOD_Context methods have been moved to tcod::Context,"
      " use `auto context = tcod::Context(params);` to make a tcod context for C++.")]] void
  save_screenshot(const std::string& filepath) {
    tcod::check_throw_error(TCOD_context_save_screenshot(this, filepath.c_str()));
  }
  /***************************************************************************
      @brief Return a new console with a size automatically determined by the context.

      @param min_columns The minimum width to use for the new console, in tiles.
      @param min_rows The minimum height to use for the new console, in tiles.
      @param magnification Determines the apparent size of the tiles that will be rendered by a console created with
        the output values.
        A `magnification` larger then 1.0f will output smaller console parameters, which will show as larger tiles when
        presented.
        Only values larger than zero are allowed.
      @return Returns a tcod::Console of a dynamic size.
      \rst
      .. deprecated:: 1.21
          Replace ``tcod::new_console(params)`` with ``tcod::Context(params)`` to get a C++ context.
      \endrst
   */
  auto new_console(int min_columns = 1, int min_rows = 1, float magnification = 1.0f) -> tcod::Console {
    int columns;
    int rows;
    if (magnification <= 0.0f) {
      throw std::invalid_argument(
          std::string("Magnification must be greater than zero. Got ") + std::to_string(magnification));
    }
    tcod::check_throw_error(TCOD_context_recommended_console_size(this, magnification, &columns, &rows));
    return tcod::Console{std::max(columns, min_columns), std::max(rows, min_rows)};
  }
#endif  // __cplusplus
  // All remaining members are private.
  /**
      The TCOD_renderer_t value of this context.
   */
  int type;
  /**
      A pointer to this contexts unique data.
   */
  void* __restrict contextdata_;
  // Context C callback are prefixed with 'c_', always check if see if these are NULL.
  /**
      Called when this context is deleted.
   */
  void (*c_destructor_)(struct TCOD_Context* __restrict self);
  /**
      Called to present a console to a contexts display.

      `console` must not be NULL.

      `viewport` may be NULL.
   */
  TCOD_Error (*c_present_)(
      struct TCOD_Context* __restrict self,
      const struct TCOD_Console* __restrict console,
      const struct TCOD_ViewportOptions* __restrict viewport);
  /**
      Convert pixel coordinates to the contexts tile coordinates.
   */
  void (*c_pixel_to_tile_)(struct TCOD_Context* __restrict self, double* __restrict x, double* __restrict y);
  /**
      Ask this context to save a screenshot.
   */
  TCOD_Error (*c_save_screenshot_)(struct TCOD_Context* __restrict self, const char* __restrict filename);
  /**
      Return this contexts SDL_Window, if any.
   */
  struct SDL_Window* (*c_get_sdl_window_)(struct TCOD_Context* __restrict self);
  /**
      Return this contexts SDL_Renderer, if any.
   */
  struct SDL_Renderer* (*c_get_sdl_renderer_)(struct TCOD_Context* __restrict self);
  /**
      Draw a console without flipping the display.
      This method of drawing is deprecated.
   */
  TCOD_Error (*c_accumulate_)(
      struct TCOD_Context* __restrict self,
      const struct TCOD_Console* __restrict console,
      const struct TCOD_ViewportOptions* __restrict viewport);
  /**
      Change the tileset used by this context.
  */
  TCOD_Error (*c_set_tileset_)(struct TCOD_Context* __restrict self, TCOD_Tileset* __restrict tileset);
  /**
      Output the recommended console size to `columns` and `rows`.

      `magnification` determines the apparent size of tiles,
      but might be ignored.
  */
  TCOD_Error (*c_recommended_console_size_)(
      struct TCOD_Context* __restrict self, float magnification, int* __restrict columns, int* __restrict rows);
  /***************************************************************************
      Fill `out_pixels` with a screen capture.

      `width` and `height` will not be NULL.
      `width` and `height` will be filled with the dimensions of the output if `out_pixels` is NULL.
      If `out_pixels` is not NULL then `width` and `height` are verified before writing to `out_pixels`,
      if verification fails then TCOD_E_INVALID_ARGUMENT must be returned.
   */
  TCOD_Error (*c_screen_capture_)(
      struct TCOD_Context* __restrict self,
      TCOD_ColorRGBA* __restrict out_pixels,
      int* __restrict width,
      int* __restrict height);
};
#ifdef __cplusplus
namespace tcod {
struct ContextDeleter {
  void operator()(TCOD_Context* console) const { TCOD_context_delete(console); }
};
typedef std::unique_ptr<TCOD_Context, ContextDeleter> ContextPtr;
typedef std::shared_ptr<TCOD_Context> ContextSharedPtr;
}  // namespace tcod
#endif  // __cplusplus
#endif  // LIBTCOD_CONTEXT_H_
