#include "ibm.h"
#include "io.h"
#include "pic.h"
#include "pit.h"
#include "video.h"

int intclear;
int keywaiting = 0;
int pic_intpending;

void pic_updatepending() {
        if (AT || romset == ROM_XI8088) {
                if ((pic2.pend & ~pic2.mask) & ~pic2.mask2)
                        pic.pend |= (1 << 2);
                else
                        pic.pend &= ~(1 << 2);
                pic_intpending = (pic.pend & ~pic.mask) & ~pic.mask2;
                if (!((pic.mask | pic.mask2) & (1 << 2)))
                        pic_intpending |= ((pic2.pend & ~pic2.mask) & ~pic2.mask2);
        } else
                pic_intpending = (pic.pend & ~pic.mask) & ~pic.mask2;

        /*        pclog("pic_intpending = %i  %02X %02X %02X %02X\n", pic_intpending, pic.ins, pic.pend, pic.mask, pic.mask2);
                pclog("                    %02X %02X %02X %02X %i %i\n", pic2.ins, pic2.pend, pic2.mask, pic2.mask2, ((pic.mask |
           pic.mask2) & (1 << 2)), ((pic2.pend&~pic2.mask)&~pic2.mask2));*/
}

void pic_reset() {
        pic.icw = 0;
        pic.mask = 0xFF;
        pic.mask2 = 0;
        pic.pend = pic.ins = 0;
        pic.vector = 8;
        pic.read = 1;
        pic2.icw = 0;
        pic2.mask = 0xFF;
        pic.mask2 = 0;
        pic2.pend = pic2.ins = 0;
        pic_intpending = 0;
        pic.level_sensitive = 0;
        pic2.level_sensitive = 0;
}

void pic_update_mask(uint8_t *mask, uint8_t ins) {
        int c;
        *mask = 0;
        for (c = 0; c < 8; c++) {
                if (ins & (1 << c)) {
                        *mask = 0xff << c;
                        return;
                }
        }
}

static void pic_autoeoi() {
        int c;

        for (c = 0; c < 8; c++) {
                if (pic.ins & (1 << c)) {
                        pic.ins &= ~(1 << c);
                        pic_update_mask(&pic.mask2, pic.ins);

                        if ((AT || romset == ROM_XI8088) && c == 2 && (pic2.pend & ~pic2.mask) & ~pic2.mask2)
                                pic.pend |= (1 << 2);

                        pic_updatepending();
                        return;
                }
        }
}

void pic_write(uint16_t addr, uint8_t val, void *priv) {
        int c;
        //        pclog("Write PIC %04X %02X %04X(%06X):%04X\n",addr,val,CS,cs,pc);
        if (addr & 1) {
                switch (pic.icw) {
                case 0: /*OCW1*/
                        //                        printf("Write mask %02X %04X:%04X\n",val,CS,pc);
                        pic.mask = val;
                        pic_updatepending();
                        break;
                case 1: /*ICW2*/
                        pic.vector = val & 0xF8;
                        //                        printf("PIC vector now %02X\n",pic.vector);
                        //             output=1;
                        if (pic.icw1 & 2)
                                pic.icw = 3;
                        else
                                pic.icw = 2;
                        break;
                case 2: /*ICW3*/
                        if (pic.icw1 & 1)
                                pic.icw = 3;
                        else
                                pic.icw = 0;
                        break;
                case 3: /*ICW4*/
                        pic.icw4 = val;
                        //                        pclog("ICW4 = %02x\n", val);
                        pic.icw = 0;
                        break;
                }
        } else {
                if (val & 16) /*ICW1*/
                {
                        pic.mask = 0;
                        pic.mask2 = 0;
                        pic.icw = 1;
                        pic.icw1 = val;
                        pic.ins = 0;
                        pic_updatepending();
                } else if (!(val & 8)) /*OCW2*/
                {
                        //                        printf("Clear ints - %02X %02X\n",pic.ins,val);
                        if ((val & 0xE0) == 0x60) {
                                //                                pclog("Specific EOI - %02X %i\n",pic.ins,1<<(val&7));
                                pic.ins &= ~(1 << (val & 7));
                                pic_update_mask(&pic.mask2, pic.ins);
                                if (val == 2 && (pic2.pend & ~pic2.mask) & ~pic2.mask2)
                                        pic.pend |= (1 << 2);
                                //                                pic.pend&=(1<<(val&7));
                                //                                if ((val&7)==1) pollkeywaiting();
                                pic_updatepending();
                        } else {
                                for (c = 0; c < 8; c++) {
                                        if (pic.ins & (1 << c)) {
                                                pic.ins &= ~(1 << c);
                                                pic_update_mask(&pic.mask2, pic.ins);

                                                if (c == 2 && (pic2.pend & ~pic2.mask) & ~pic2.mask2)
                                                        pic.pend |= (1 << 2);

                                                if (c == 1 && keywaiting) {
                                                        intclear &= ~1;
                                                        //                                                        pollkeywaiting();
                                                }
                                                pic_updatepending();
                                                //                                                pclog("Generic EOI - Cleared int
                                                //                                                %i\n",c);
                                                return;
                                        }
                                }
                        }
                } else /*OCW3*/
                {
                        // if (val&4) fatal("PIC1 write OCW3 4 %02X\n",val);
                        if (val & 2)
                                pic.read = (val & 1);
                        if (val & 0x40) {
                        } // fatal("PIC 1 write OCW3 40 %02X\n",val);
                }
        }
}

uint8_t pic_read(uint16_t addr, void *priv) {
        if (addr & 1) { /*pclog("Read PIC mask %02X\n",pic.mask);*/
                return pic.mask;
        }
        if (pic.read) { /*pclog("Read PIC ins %02X\n",pic.ins);*/
                return pic.ins | (pic2.ins ? 4 : 0);
        }
        //        pclog("Read PIC pend %02X %08X\n",pic.pend,EDX);
        return pic.pend;
}

void pic_init() { io_sethandler(0x0020, 0x0002, pic_read, NULL, NULL, pic_write, NULL, NULL, NULL); }

static void pic2_autoeoi() {
        int c;

        for (c = 0; c < 8; c++) {
                if (pic2.ins & (1 << c)) {
                        pic2.ins &= ~(1 << c);
                        pic_update_mask(&pic2.mask2, pic2.ins);

                        pic_updatepending();
                        return;
                }
        }
}

void pic2_write(uint16_t addr, uint8_t val, void *priv) {
        int c;
        //        pclog("Write PIC2 %04X %02X %04X:%04X %i\n",addr,val,CS,pc,ins);
        if (addr & 1) {
                switch (pic2.icw) {
                case 0: /*OCW1*/
                        //                        printf("PIC2 Write mask %02X %04X:%04X\n",val,CS,pc);
                        pic2.mask = val;
                        pic_updatepending();
                        break;
                case 1: /*ICW2*/
                        pic2.vector = val & 0xF8;
                        //                        pclog("PIC2 vector %02X\n", val & 0xf8);
                        if (pic2.icw1 & 2)
                                pic2.icw = 3;
                        else
                                pic2.icw = 2;
                        break;
                case 2: /*ICW3*/
                        if (pic2.icw1 & 1)
                                pic2.icw = 3;
                        else
                                pic2.icw = 0;
                        break;
                case 3: /*ICW4*/
                        pic2.icw4 = val;
                        pic2.icw = 0;
                        break;
                }
        } else {
                if (val & 16) /*ICW1*/
                {
                        pic2.mask = 0;
                        pic2.mask2 = 0;
                        pic2.icw = 1;
                        pic2.icw1 = val;
                        pic2.ins = 0;
                        pic_updatepending();
                } else if (!(val & 8)) /*OCW2*/
                {
                        if ((val & 0xE0) == 0x60) {
                                pic2.ins &= ~(1 << (val & 7));
                                pic_update_mask(&pic2.mask2, pic2.ins);

                                pic_updatepending();
                        } else {
                                for (c = 0; c < 8; c++) {
                                        if (pic2.ins & (1 << c)) {
                                                pic2.ins &= ~(1 << c);
                                                pic_update_mask(&pic2.mask2, pic2.ins);

                                                pic_updatepending();
                                                return;
                                        }
                                }
                        }
                } else /*OCW3*/
                {
                        if (val & 2)
                                pic2.read = (val & 1);
                }
        }
}

uint8_t pic2_read(uint16_t addr, void *priv) {
        if (addr & 1) { /*pclog("Read PIC2 mask %02X %04X:%08X\n",pic2.mask,CS,pc);*/
                return pic2.mask;
        }
        if (pic2.read) { /*pclog("Read PIC2 ins %02X %04X:%08X\n",pic2.ins,CS,pc);*/
                return pic2.ins;
        }
        /*pclog("Read PIC2 pend %02X %04X:%08X\n",pic2.pend,CS,pc);*/
        return pic2.pend;
}

void pic2_init() { io_sethandler(0x00a0, 0x0002, pic2_read, NULL, NULL, pic2_write, NULL, NULL, NULL); }

static uint8_t pic_elcrx_read(uint16_t addr, void *p) {
        uint8_t temp = 0xff;

        switch (addr) {
        case 0x4d0:
                temp = pic.level_sensitive;
                break;
        case 0x4d1:
                temp = pic2.level_sensitive;
                break;
        }

        return temp;
}

static void pic_elcrx_write(uint16_t addr, uint8_t val, void *p) {
        //        pclog("pic_elcrx_write: addr=%04x val=%02x\n", addr, val);
        switch (addr) {
        case 0x4d0:
                pic.level_sensitive = val & 0xf8;
                break;
        case 0x4d1:
                pic2.level_sensitive = val & 0xde;
                break;
        }
}

void pic_init_elcrx() { io_sethandler(0x04d0, 0x0002, pic_elcrx_read, NULL, NULL, pic_elcrx_write, NULL, NULL, NULL); }

void clearpic() {
        pic.pend = pic.ins = 0;
        pic_updatepending();
        //        pclog("Clear PIC\n");
}

int pic_current[16];

void picint(uint16_t num) {
        if ((AT || romset == ROM_XI8088) && num == (1 << 2))
                num = 1 << 9;
        //        pclog("picint : %04X\n", num);
        if ((AT || romset == ROM_XI8088) && num > 0xFF) {
                pic2.pend |= (num >> 8);
                if ((pic2.pend & ~pic2.mask) & ~pic2.mask2)
                        pic.pend |= (1 << 2);
        } else if (num <= 0xff) {
                pic.pend |= num;
        }
        //        pclog("picint : PEND now %02X %02X\n", pic.pend, pic2.pend);
        pic_updatepending();
}

void picintlevel(uint16_t num) {
        int c = 0;
        while (!(num & (1 << c)))
                c++;
        if ((AT || romset == ROM_XI8088) && num == (1 << 2)) {
                c = 9;
                num = 1 << 9;
        }
        //        pclog("INTLEVEL %04X %i\n", num, c);
        if (!pic_current[c]) {
                pic_current[c] = 1;
                if (num > 0xFF) {
                        pic2.pend |= (num >> 8);
                } else {
                        pic.pend |= num;
                }
        }
        pic_updatepending();
}
void picintc(uint16_t num) {
        int c = 0;
        if (!num)
                return;
        while (!(num & (1 << c)))
                c++;
        if ((AT || romset == ROM_XI8088) && num == (1 << 2)) {
                c = 9;
                num = 1 << 9;
        }
        //        pclog("INTC %04X %i\n", num, c);
        pic_current[c] = 0;

        if ((AT || romset == ROM_XI8088) && num > 0xff) {
                pic2.pend &= ~(num >> 8);
                if (!((pic2.pend & ~pic2.mask) & ~pic2.mask2))
                        pic.pend &= ~(1 << 2);
        } else if (num <= 0xff) {
                pic.pend &= ~num;
        }
        pic_updatepending();
}

uint8_t picinterrupt() {
        uint8_t temp = pic.pend & ~pic.mask;
        int c;
        for (c = 0; c < 8; c++) {
                if ((AT || romset == ROM_XI8088) && (temp & (1 << 2))) {
                        uint8_t temp2 = pic2.pend & ~pic2.mask;
                        for (c = 0; c < 8; c++) {
                                if (temp2 & (1 << c)) {
                                        if (!(pic2.level_sensitive & (1 << c)))
                                                pic2.pend &= ~(1 << c);
                                        pic2.ins |= (1 << c);
                                        pic_update_mask(&pic2.mask2, pic2.ins);

                                        if (!(pic2.level_sensitive & (1 << c)))
                                                pic.pend &= ~(1 << c);
                                        pic.ins |= (1 << 2); /*Cascade IRQ*/
                                        pic_update_mask(&pic.mask2, pic.ins);

                                        pic_updatepending();

                                        if (pic2.icw4 & 0x02)
                                                pic2_autoeoi();

                                        return c + pic2.vector;
                                }
                        }
                } else if (temp & (1 << c)) {
                        if (!(pic.level_sensitive & (1 << c)))
                                pic.pend &= ~(1 << c);
                        pic.ins |= (1 << c);
                        pic_update_mask(&pic.mask2, pic.ins);
                        pic_updatepending();

                        if (pic.icw4 & 0x02)
                                pic_autoeoi();
                        return c + pic.vector;
                }
        }
        return 0xFF;
}

void dumppic() {
        pclog("PIC1 : MASK %02X PEND %02X INS %02X VECTOR %02X\n", pic.mask, pic.pend, pic.ins, pic.vector);
        pclog("PIC2 : MASK %02X PEND %02X INS %02X VECTOR %02X\n", pic2.mask, pic2.pend, pic2.ins, pic2.vector);
}
