/*
 *  File:       directn.h
 *  Summary:    Functions used when picking squares.
 *  Written by: Linley Henzell
 *
 *  Modified for Crawl Reference by $Author$ on $Date$
 *
 *  Change History (most recent first):
 *
 *               <1>     -/--/--        LRH             Created
 */


#ifndef DIRECT_H
#define DIRECT_H

#include "externs.h"
#include "enum.h"
#include "libgui.h"
#include "ray.h"

class crawl_view_buffer
{
public:
    crawl_view_buffer();
    ~crawl_view_buffer();
    void size(const coord_def &size);
    operator screen_buffer_t * () { return (buffer); }

    void draw();
private:
    screen_buffer_t *buffer;
};

// last updated 12may2000 {dlb}
/* ***********************************************************************
 * called from: acr - debug - effects - it_use3 - item_use - spells1 -
 *              spells2 - spells3 - spells4
 * *********************************************************************** */
struct crawl_view_geometry
{
public:
    coord_def termp;               // Left-top pos of terminal.
    coord_def termsz;              // Size of the terminal.
    coord_def viewp;               // Left-top pos of viewport.
    coord_def viewsz;              // Size of the viewport (play area).
    coord_def hudp;                // Left-top pos of status area.
    coord_def hudsz;               // Size of the status area.
    coord_def msgp;                // Left-top pos of the message pane.
    coord_def msgsz;               // Size of the message pane.
    coord_def mlistp;              // Left-top pos of the monster list.
    coord_def mlistsz;             // Size of the monster list.

    crawl_view_buffer vbuf;        // Buffer for drawing the main game map.

    coord_def vgrdc;               // What grid pos is at the centre of the view
                                   // usually you.pos().

    coord_def viewhalfsz;

    coord_def glos1, glos2;        // LOS limit grid coords (inclusive)
    coord_def vlos1, vlos2;        // LOS limit viewport coords (inclusive)

    coord_def mousep;              // Where the mouse is.

private:
    coord_def last_player_pos;

public:
    crawl_view_geometry();
    void init_geometry();

    void init_view();
    void set_player_at(const coord_def &c, bool force_centre = false);

    coord_def view_centre() const
    {
        return viewp + viewhalfsz;
    }

    bool in_grid_los(const coord_def &c) const
    {
        return (c.x >= glos1.x && c.x <= glos2.x
                && c.y >= glos1.y && c.y <= glos2.y);
    }

    bool in_view_los(const coord_def &c) const
    {
        return (c.x >= vlos1.x && c.x <= vlos2.x
                && c.y >= vlos1.y && c.y <= vlos2.y);
    }

    bool in_view_viewport(const coord_def &c) const
    {
        return (c.x >= viewp.x && c.y >= viewp.y
                && c.x < viewp.x + viewsz.x
                && c.y < viewp.y + viewsz.y);
    }

    bool in_grid_viewport(const coord_def &c) const
    {
        return in_view_viewport(c - vgrdc + view_centre());
    }
};

extern crawl_view_geometry crawl_view;

// An object that modifies the behaviour of the direction prompt.
class targeting_behaviour
{
public:
    targeting_behaviour(bool just_looking = false);
    virtual ~targeting_behaviour();

    // Returns a keystroke for the prompt.
    virtual int get_key();
    virtual command_type get_command(int key = -1);
    virtual bool should_redraw();
    virtual void mark_ammo_nonchosen();

public:
    bool just_looking;
    bool compass;
};

// output from direction() function:
struct dist
{
    bool isValid;       // valid target chosen?
    bool isTarget;      // target (true), or direction (false)?
    bool isMe;          // selected self (convenience: tx == you.x_pos,
                        // ty == you.y_pos)
    bool isEndpoint;    // Does the player want the attack to stop at (tx,ty)?
    bool isCancel;      // user cancelled (usually <ESC> key)
    bool choseRay;      // user wants a specific beam
    int  tx,ty;         // target x,y or logical extension of beam to map edge
    int  dx,dy;         // delta x and y if direction - always -1,0,1
    ray_def ray;        // ray chosen if necessary

    // internal use - ignore
    int  prev_target;   // previous target

    // target - source (source == you.pos())
    coord_def target() const
    {
        return coord_def(tx, ty);
    }
};

void direction( dist &moves, targeting_type restricts = DIR_NONE,
                targ_mode_type mode = TARG_ANY, int range = -1,
                bool just_looking = false, bool needs_path = true,
                bool may_target_monster = true, const char *prompt = NULL,
                targeting_behaviour *mod = NULL, bool cancel_at_self = false );

bool in_los_bounds(int x, int y);
bool in_viewport_bounds(int x, int y);
bool in_los(int x, int y);
bool in_vlos(int x, int y);
bool in_vlos(const coord_def &pos);

void terse_describe_square(const coord_def &c);
void full_describe_square(const coord_def &c);
void describe_floor();
std::string get_monster_desc(const monsters *mon,
                             bool full_desc = true,
                             description_level_type mondtype = DESC_CAP_A);

int dos_direction_unmunge(int doskey);

std::string feature_description(int mx, int my, bool bloody = false,
                                description_level_type dtype = DESC_CAP_A,
                                bool add_stop = true);
std::string raw_feature_description(dungeon_feature_type grid,
                                    trap_type tr = NUM_TRAPS);
std::string feature_description(dungeon_feature_type grid,
                                trap_type trap = NUM_TRAPS, bool bloody = false,
                                description_level_type dtype = DESC_CAP_A,
                                bool add_stop = true);

std::vector<dungeon_feature_type> features_by_desc(const base_pattern &pattern);

inline int view2gridX(int vx)
{
    return (crawl_view.vgrdc.x + vx - crawl_view.view_centre().x);
}

inline int view2gridY(int vy)
{
    return (crawl_view.vgrdc.y + vy - crawl_view.view_centre().y);
}

inline coord_def view2grid(const coord_def &pos)
{
    return pos - crawl_view.view_centre() + crawl_view.vgrdc;
}

inline int grid2viewX(int gx)
{
    return (gx - crawl_view.vgrdc.x + crawl_view.view_centre().x);
}

inline int grid2viewY(int gy)
{
    return (gy - crawl_view.vgrdc.y + crawl_view.view_centre().y);
}

inline coord_def grid2view(const coord_def &pos)
{
    return (pos - crawl_view.vgrdc + crawl_view.view_centre());
}

inline coord_def view2show(const coord_def &pos)
{
    return (pos - crawl_view.vlos1 + coord_def(1, 1));
}

inline coord_def show2view(const coord_def &pos)
{
    return (pos + crawl_view.vlos1 - coord_def(1, 1));
}

inline coord_def grid2show(const coord_def &pos)
{
    return (view2show(grid2view(pos)));
}

extern const struct coord_def Compass[8];

#endif