/*
 * data-types.h
 * Copyright (C) 2016 Kovid Goyal <kovid at kovidgoyal.net>
 *
 * Distributed under terms of the GPL3 license.
 */

#pragma once


#include <stdint.h>
#include <stdbool.h>
#include <poll.h>
#include <pthread.h>
#define PY_SSIZE_T_CLEAN
#include <Python.h>
// Required minimum OpenGL version
#define OPENGL_REQUIRED_VERSION_MAJOR 3
#define OPENGL_REQUIRED_VERSION_MINOR 3
#define UNUSED __attribute__ ((unused))
#define EXPORTED __attribute__ ((visibility ("default")))
#define LIKELY(x)    __builtin_expect (!!(x), 1)
#define UNLIKELY(x)  __builtin_expect (!!(x), 0)
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
#define MIN(x, y) (((x) > (y)) ? (y) : (x))
#define xstr(s) str(s)
#define str(s) #s
#define arraysz(x) (sizeof(x)/sizeof(x[0]))
void log_error(const char *fmt, ...);
#define fatal(...) { log_error(__VA_ARGS__); exit(EXIT_FAILURE); }

typedef unsigned long long id_type;
typedef uint32_t char_type;
typedef uint32_t color_type;
typedef uint16_t combining_type;
typedef uint32_t pixel;
typedef unsigned int index_type;
typedef uint16_t sprite_index;
typedef uint16_t attrs_type;
typedef uint8_t line_attrs_type;
typedef enum CursorShapes { NO_CURSOR_SHAPE, CURSOR_BLOCK, CURSOR_BEAM, CURSOR_UNDERLINE, NUM_OF_CURSOR_SHAPES } CursorShape;

#define ERROR_PREFIX "[PARSE ERROR]"
typedef enum MouseTrackingModes { NO_TRACKING, BUTTON_MODE, MOTION_MODE, ANY_MODE } MouseTrackingMode;
typedef enum MouseTrackingProtocols { NORMAL_PROTOCOL, UTF8_PROTOCOL, SGR_PROTOCOL, URXVT_PROTOCOL} MouseTrackingProtocol;
typedef enum MouseShapes { BEAM, HAND, ARROW } MouseShape;

#define MAX_CHILDREN 512
#define BLANK_CHAR 0
#define ATTRS_MASK_WITHOUT_WIDTH 0xFFC
#define WIDTH_MASK  3
#define DECORATION_SHIFT  2
#define DECORATION_MASK 3
#define BOLD_SHIFT 4
#define ITALIC_SHIFT 5
#define BI_VAL(attrs) ((attrs >> 4) & 3)
#define REVERSE_SHIFT 6
#define STRIKE_SHIFT 7
#define COL_MASK 0xFFFFFFFF
#define UTF8_ACCEPT 0
#define UTF8_REJECT 1
#define DECORATION_FG_CODE 58
#define CHAR_IS_BLANK(ch) ((ch) == 32 || (ch) == 0)
#define CONTINUED_MASK 1
#define TEXT_DIRTY_MASK 2

#define FG 1
#define BG 2

#define CURSOR_TO_ATTRS(c, w) \
    ((w) | (((c->decoration & 3) << DECORATION_SHIFT) | ((c->bold & 1) << BOLD_SHIFT) | \
            ((c->italic & 1) << ITALIC_SHIFT) | ((c->reverse & 1) << REVERSE_SHIFT) | ((c->strikethrough & 1) << STRIKE_SHIFT)))

#define ATTRS_TO_CURSOR(a, c) \
    (c)->decoration = (a >> DECORATION_SHIFT) & 3; (c)->bold = (a >> BOLD_SHIFT) & 1; (c)->italic = (a >> ITALIC_SHIFT) & 1; \
    (c)->reverse = (a >> REVERSE_SHIFT) & 1; (c)->strikethrough = (a >> STRIKE_SHIFT) & 1;

#define COPY_CELL(src, s, dest, d) \
    (dest)->cells[d] = (src)->cells[s];

#define COPY_SELF_CELL(s, d) COPY_CELL(self, s, self, d)

#define METHOD(name, arg_type) {#name, (PyCFunction)name, arg_type, name##_doc},
#define METHODB(name, arg_type) {#name, (PyCFunction)name, arg_type, ""}

#define BOOL_GETSET(type, x) \
    static PyObject* x##_get(type *self, void UNUSED *closure) { PyObject *ans = self->x ? Py_True : Py_False; Py_INCREF(ans); return ans; } \
    static int x##_set(type *self, PyObject *value, void UNUSED *closure) { if (value == NULL) { PyErr_SetString(PyExc_TypeError, "Cannot delete attribute"); return -1; } self->x = PyObject_IsTrue(value) ? true : false; return 0; }

#define GETSET(x) \
    {#x, (getter) x##_get, (setter) x##_set, #x, NULL},

#ifndef EXTRA_INIT
#define EXTRA_INIT
#endif
#define INIT_TYPE(type) \
    int init_##type(PyObject *module) {\
        if (PyType_Ready(&type##_Type) < 0) return 0; \
        if (PyModule_AddObject(module, #type, (PyObject *)&type##_Type) != 0) return 0; \
        Py_INCREF(&type##_Type); \
        EXTRA_INIT; \
        return 1; \
    }

#define RICHCMP(type) \
    static PyObject * richcmp(PyObject *obj1, PyObject *obj2, int op) { \
        PyObject *result = NULL; \
        int eq; \
        if (op != Py_EQ && op != Py_NE) { Py_RETURN_NOTIMPLEMENTED; } \
        if (!PyObject_TypeCheck(obj1, &type##_Type)) { Py_RETURN_FALSE; } \
        if (!PyObject_TypeCheck(obj2, &type##_Type)) { Py_RETURN_FALSE; } \
        eq = __eq__((type*)obj1, (type*)obj2); \
        if (op == Py_NE) result = eq ? Py_False : Py_True; \
        else result = eq ? Py_True : Py_False; \
        Py_INCREF(result); \
        return result; \
    }

#ifdef __clang__
#define START_ALLOW_CASE_RANGE _Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wpedantic\"")
#define END_ALLOW_CASE_RANGE _Pragma("clang diagnostic pop")
#define ALLOW_UNUSED_RESULT _Pragma("clang diagnostic push") _Pragma("clang diagnostic ignored \"-Wunused-result\"")
#define END_ALLOW_UNUSED_RESULT _Pragma("clang diagnostic pop")
#else
#define START_ALLOW_CASE_RANGE _Pragma("GCC diagnostic ignored \"-Wpedantic\"")
#define END_ALLOW_CASE_RANGE _Pragma("GCC diagnostic pop")
#define ALLOW_UNUSED_RESULT _Pragma("GCC diagnostic ignored \"-Wunused-result\"")
#define END_ALLOW_UNUSED_RESULT _Pragma("GCC diagnostic pop")
#endif

typedef struct {
    uint32_t left, top, right, bottom;
} Region;

typedef struct {
    color_type fg, bg, decoration_fg;
    sprite_index sprite_x, sprite_y, sprite_z;
    attrs_type attrs;
    // The following are only needed on the CPU, not the GPU
    char_type ch;
    combining_type cc_idx[2];
} Cell;

typedef struct {
    PyObject_HEAD

    Cell *cells;
    index_type xnum, ynum;
    bool continued, needs_free, has_dirty_text;
} Line;


typedef struct {
    PyObject_HEAD

    Cell *buf;
    index_type xnum, ynum, *line_map, *scratch;
    line_attrs_type *line_attrs;
    Line *line;
} LineBuf;


typedef struct {
    PyObject_HEAD

    Cell *buf;
    index_type xnum, ynum;
    Line *line;
    index_type start_of_data, count;
    line_attrs_type *line_attrs;
} HistoryBuf;

typedef struct {
    PyObject_HEAD

    bool bold, italic, reverse, strikethrough, blink;
    unsigned int x, y;
    uint8_t decoration;
    CursorShape shape;
    color_type fg, bg, decoration_fg;

} Cursor;

typedef struct {
    bool is_visible, is_focused;
    CursorShape shape;
    unsigned int x, y;
    double left, right, top, bottom;
    color_type color;
} CursorRenderInfo;

typedef struct {
    color_type default_fg, default_bg, cursor_color, highlight_fg, highlight_bg;
} DynamicColor;

typedef struct {
    PyObject_HEAD

    bool dirty;
    uint32_t color_table[256];
    uint32_t orig_color_table[256];
    DynamicColor configured, overridden;
} ColorProfile;


#define PARSER_BUF_SZ (8 * 1024)
#define READ_BUF_SZ (1024*1024)

#define clear_sprite_position(cell) (cell).sprite_x = 0; (cell).sprite_y = 0; (cell).sprite_z = 0;

#define left_shift_line(line, at, num) \
    for(index_type __i__ = (at); __i__ < (line)->xnum - (num); __i__++) { \
        COPY_CELL(line, __i__ + (num), line, __i__) \
    } \
    if ((((line)->cells[(at)].attrs) & WIDTH_MASK) != 1) { \
        (line)->cells[(at)].ch = BLANK_CHAR; \
        (line)->cells[(at)].attrs = BLANK_CHAR ? 1 : 0; \
        clear_sprite_position((line)->cells[(at)]); \
    }

#define ensure_space_for(base, array, type, num, capacity, initial_cap, zero_mem) \
    if ((base)->capacity < num) { \
        size_t _newcap = MAX(initial_cap, MAX(2 * (base)->capacity, num)); \
        (base)->array = realloc((base)->array, sizeof(type) * _newcap); \
        if ((base)->array == NULL) fatal("Out of memory while ensuring space for %zu elements in array of %s", (size_t)num, #type); \
        if (zero_mem) memset((base)->array + (base)->capacity, 0, sizeof(type) * (_newcap - (base)->capacity)); \
        (base)->capacity = _newcap; \
    }


// Global functions
const char* base64_decode(const uint32_t *src, size_t src_sz, uint8_t *dest, size_t dest_capacity, size_t *dest_sz);
Line* alloc_line();
Cursor* alloc_cursor();
LineBuf* alloc_linebuf(unsigned int, unsigned int);
HistoryBuf* alloc_historybuf(unsigned int, unsigned int);
ColorProfile* alloc_color_profile();
PyObject* create_256_color_table();
PyObject* parse_bytes_dump(PyObject UNUSED *, PyObject *);
PyObject* parse_bytes(PyObject UNUSED *, PyObject *);
uint32_t decode_utf8(uint32_t*, uint32_t*, uint8_t byte);
unsigned int encode_utf8(uint32_t ch, char* dest);
void cursor_reset(Cursor*);
Cursor* cursor_copy(Cursor*);
void cursor_copy_to(Cursor *src, Cursor *dest);
void cursor_reset_display_attrs(Cursor*);
void cursor_from_sgr(Cursor *self, unsigned int *params, unsigned int count);
void apply_sgr_to_cells(Cell *first_cell, unsigned int cell_count, unsigned int *params, unsigned int count);
const char* cursor_as_sgr(Cursor*, Cursor*);

double monotonic();
PyObject* cm_thread_write(PyObject *self, PyObject *args);
bool schedule_write_to_child(unsigned long id, const char *data, size_t sz);
bool set_iutf8(int, bool);

color_type colorprofile_to_color(ColorProfile *self, color_type entry, color_type defval);
void copy_color_table_to_buffer(ColorProfile *self, color_type *address, int offset, size_t stride);

void set_mouse_cursor(MouseShape);
void mouse_event(int, int);
void focus_in_event();
void wakeup_io_loop(bool);
void scroll_event(double, double);
void fake_scroll(int, bool);
void set_special_key_combo(int glfw_key, int mods);
void on_text_input(unsigned int codepoint, int mods);
void on_key_input(int key, int scancode, int action, int mods);
void request_window_attention(id_type, bool);
