//
//  6502.h
//  6502
//
//  Created by Tamas Rudnai on 7/22/19.
//  Copyright © 2019 GameAlloy. All rights reserved.
//

#ifndef __6502_H__
#define __6502_H__

#include <stdint.h>
#include "../../src/util/common.h"


extern unsigned long long MHz_6502;
extern unsigned long long clk_6502_per_frm;
extern unsigned long long clk_6502_per_frm_set;
extern unsigned long long clk_6502_per_frm_max;
extern unsigned int clkfrm;


typedef enum {
    NO_INT,
    HLT,
    IRQ,
    NMI,
    HARDRESET,
    SOFTRESET,
} interrupt_t;


typedef struct debugLevel_s {
    uint8_t trace       : 1;
    uint8_t step        : 1;
    uint8_t brk         : 1;
    uint8_t rts         : 1;
    uint8_t bra         : 1;
    uint8_t bra_true    : 1;
    uint8_t bra_false   : 1;
    uint8_t compile     : 1;
} debugLevel_t;


typedef struct m6502_s {
    uint8_t  A;             // Accumulator
    uint8_t  X;             // X index register
    uint8_t  Y;             // Y index register
//    union {
//        uint8_t  instr;         // Instruction
//        struct {
//            uint8_t cc:2;
//            uint8_t bbb:3;
//            uint8_t aaa:3;
//        };
//    };
    union {
        uint8_t SR;         // Status Register
        struct {
            uint8_t C:1;    // Carry Flag
            uint8_t Z:1;    // Zero Flag
            uint8_t I:1;    // Interrupt Flag
            uint8_t D:1;    // Decimal Flag
            uint8_t B:1;    // B Flag
            uint8_t res:1;  // reserved -- should be always 1
            uint8_t V:1;    // Overflow Flag ???
            uint8_t N:1;    // Negative Flag
        };
    };
    uint16_t PC;            // Program Counter
    uint8_t SP;             // Stack Pointer ( stack addr = 0x01 + sp )

//    unsigned clk;           // Clock Counter
    uint64_t clktime;
    uint64_t clklast;

    debugLevel_t dbgLevel;  // 0: No Debug, 1: Disassembly Only, 2: Run till BRK, 3: StepByStep
    
    union {
        unsigned int IF;             // interrut flag
        interrupt_t interrupt;
    };
    
} m6502_t;


typedef struct disassembly_s {
    char addr[5];                   // 4 digits + \0
    char opcode[4 * 3 + 1];         // max 4 bytes * (2 digits + 1 space) + \0
    char * pOpcode;                 // pointer for opcode string builder
    char inst[6 + 1];               // 3 char (unknown instr? -- give it 6 chars) + \0
    char oper[14 + 2 + 1 + 1 + 1];  // 4 digits + 2 brackets + 1 comma + 1 index + \0
    char comment[256];              // to be able to add some comments
} disassembly_t;


// Memory Config
typedef struct MEMcfg_s {
    unsigned RAM_16K     : 1;
    unsigned RAM_128K    : 1;
    unsigned RD_RAM      : 1;
    unsigned WR_RAM      : 1;
    unsigned RAM_BANK_2  : 1;
    unsigned AUX_BANK    : 1;
    unsigned txt_page_2  : 1;    // 0: page 1   1: page 2 (aux video memory)
    unsigned int_Cx_ROM  : 1;    // 0: Slot Cx ROM   1: Internal Cx ROM
    unsigned slot_C3_ROM : 1;    // 0: Internal ROM  1: Slot 3 ROM
    unsigned is_80STORE  : 1;
    unsigned RD_AUX_MEM  : 1;
    unsigned WR_AUX_MEM  : 1;
    unsigned ALT_ZP      : 1;
} MEMcfg_t;


typedef union videoMode_u {
    struct {
        uint8_t text    : 1;    // 0: graphics 1: text
        uint8_t col80   : 1;    // 0: 40 col   1: 80 col
        uint8_t altChr  : 1;    // 0: normal   1: alternate character set
        uint8_t mixed   : 1;    // 0: no mix   1: mixed graphics and text when in graphics mode
        uint8_t hires   : 1;    // 0: loRes    1: hiRes
    };
    uint8_t mode;
} videoMode_t;

extern videoMode_t videoMode;
extern MEMcfg_t MEMcfg;

extern m6502_t m6502;
extern uint8_t * const AUX;         // Pointer to the auxiliary memory so we can use this from Swift
extern uint8_t * const RAM;
//extern uint8_t * AUX_VID_RAM;
extern uint32_t * videoMemPtr;

extern void hires_Update(void);

extern double mips;
extern double mhz;

#define fps 30U

extern void rom_loadFile( const char * bundlePath, const char * filename );
extern void woz_loadFile( const char * bundlePath, const char * filename );
extern void tst6502(void);
extern void m6502_ColdReset( const char * bundlePath, const char * romFilePath );
extern void m6502_Run(void);
extern void kbdInput ( uint8_t code );
extern void setIO ( uint16_t ioaddr, uint8_t val );



#endif /* __6502_H__ */