#include "circuit.h"

#include "assert.h"

// bool Gate::sa(bool x) {
//     if(x == 0) {
//         return propagate && value;
//     } else {
//         return propagate && !value;
//     }
// }

bool Gate::cal_sa(bool x) {
    if(po) {
        if(x == 0) return value;
        else return !value;
    }

    bool sa0 = 0;
    bool sa1 = 0;

    for(Gate* out : outputs) {
        if(!out->propagate) continue;

        if(out->cal_value() != out->value) continue;

        this->value = !this->value;
        bool detect = out->cal_value() != out->value;
        this->value = !this->value;
        if(!detect) continue;

        sa0 |= this->value;
        sa1 |= !this->value;
    }
    if(x == 0) return sa0;
    else return sa1;
}

int Gate::cal_value() {
    int res;

    switch(type) {
        case NOT:
            res = !inputs[0]->value;
            break;
        case BUF:
            res = inputs[0]->value;
            break;
        case AND:
            res = inputs[0]->value;
            for(int i=1; i<inputs.size(); i++) {
                res &= inputs[i]->value;
            }
            break;
        case NAND:
            res = inputs[0]->value;
            for(int i=1; i<inputs.size(); i++) {
                res &= inputs[i]->value;
            }
            res = !res;
            break;
        case OR:
            res = inputs[0]->value;
            for(int i=1; i<inputs.size(); i++) {
                res |= inputs[i]->value;
            }
            break;
        case NOR:
            res = inputs[0]->value;
            for(int i=1; i<inputs.size(); i++) {
                res |= inputs[i]->value;
            }
            res = !res;
            break;
        case XOR:
            res = inputs[0]->value;
            for(int i=1; i<inputs.size(); i++) {
                res ^= inputs[i]->value;
            }
            break;
        case XNOR:
            res = inputs[0]->value;
            for(int i=1; i<inputs.size(); i++) {
                res ^= inputs[i]->value;
            }
            res = !res;
            break;
        case INPUT:
            res = value;
            break;
        default:
            assert(false);
            break;
    }
    return res;
}