#include "ngspice/ngspice.h"
#include "ngspice/ifsim.h"
#include "ngspice/gendefs.h"
#include "ngspice/cktdefs.h"
#include "ngspice/cpstd.h"
#include "ngspice/ftedefs.h"
#include "ngspice/fteext.h"
#include "ngspice/devdefs.h"
#include "ngspice/dgen.h"
#include "gens.h"


static void dgen_next(dgen **dgx);


void
wl_forall(wordlist *wl, void (*fn)(wordlist*, dgen*), dgen *data)
{
    while (wl) {
        fn (wl, data);
        wl = wl->wl_next;
    }
}


dgen *
dgen_init(CKTcircuit *ckt, wordlist *wl, int nomix, int flag, int model)
{
    dgen  *dg, *dg_save;

    NG_IGNORE(nomix);

    dg = TMALLOC(dgen, 1);
    dg->ckt = ckt;
    dg->instance = NULL;
    dg->model = NULL;
    dg->dev_type_no = -1;
    dg->dev_list = wl;
    dg->flags = 0;
    dg_save = dg; /* va: save, to avoid memory leak */

    if (model)
        dg->flags = (DGEN_ALL & ~ DGEN_INSTANCE) | DGEN_INIT;
    else
        dg->flags = DGEN_ALL | DGEN_INIT;

    if (wl)
        dg->flags |= flag;
    else
        dg->flags |= DGEN_DEFDEVS | flag;

    dgen_next(&dg);
    /* va: it might be too much tests, but safer is better... */
    if (dg != dg_save && dg == NULL && dg_save != NULL)
        tfree(dg_save);

    return dg;
}


int
dgen_for_n(dgen *dg, int n, int (*fn) (dgen*, IFparm*, int), IFparm *data, int subindex)
{
    dgen  dgx, *dgxp;
    int   dnum, i, j, k;

    dgxp = &dgx;
    memcpy(dgxp, dg, sizeof(dgx)); /* va: compatible pointer types */

    dnum = dgxp->dev_type_no;

    k = 0;
    for (i = 0; dgxp && dgxp->dev_type_no == dnum && i < n; i++) {
        /*printf("Loop at %d\n", i);*/
        j = fn (dgxp, data, subindex);
        if (j > k)
            k = j;
        dgen_next(&dgxp);
    }

    return k - subindex;
}


void
dgen_nth_next(dgen **p_dg, int n)
{
    int    i, dnum;
    dgen  *dg_save = *p_dg; /* va: save, to avoid memory leak */

    dnum = (*p_dg)->dev_type_no;

    for (i = 0; *p_dg && (*p_dg)->dev_type_no == dnum && i < n; i++) {
        dgen_next(p_dg);
        /* va: it might be too much tests, but safer is better... */
        if (*p_dg != dg_save && *p_dg == NULL && dg_save != NULL)
            tfree(dg_save);
    }
}


static void
dgen_next(dgen **dgx)
{
    int     done;
    dgen    *dg;
    char    *p;
    int     need;
    wordlist *w;
    char    type, *subckt, *device, *model;
    char    *Top_Level = "\001";
    int     subckt_len;
    int     head_match;
    char    *word, *dev_name, *mod_name;

    dg = *dgx;
    if (!dg)
        return;

    /* Prime the "model only" or "device type only" iteration,
     * required because the filtering (below) may request additional
     * detail.
     */
    if (!(dg->flags & DGEN_INSTANCE)) {
        if (!(dg->flags & DGEN_MODEL))
            dg->model = NULL;
        dg->instance = NULL;
    }

    need = dg->flags;
    done = 0;

    while (!done) {

        if (dg->instance) {
            /* next instance */
            dg->instance = dg->instance->GENnextInstance;
        } else if (dg->model) {
            dg->model = dg->model->GENnextModel;
            if (dg->model)
                dg->instance = dg->model->GENinstances;
        } else if (dg->dev_type_no < DEVmaxnum) {
            dg->dev_type_no += 1;
            if (dg->dev_type_no < DEVmaxnum) {
                dg->model = dg->ckt->CKThead[dg->dev_type_no];
                if (dg->model)
                    dg->instance = dg->model->GENinstances;
            } else {
                done = 2;
                break;
            }
        } else {
            done = 2;
            break;
        }

        if (need & DGEN_INSTANCE && !dg->instance)
            continue;
        if (need & DGEN_MODEL && !dg->model)
            continue;

        /* Filter */
        if (!dg->dev_list) {
            if ((dg->flags & DGEN_ALLDEVS) ||
                ((dg->flags & DGEN_DEFDEVS) &&
                 (ft_sim->devices[dg->dev_type_no]->flags & DEV_DEFAULT)))
            {
                done = 1;
            } else {
                done = 0;
            }
            continue;
        }

        done = 0;

        for (w = dg->dev_list; w && !done; w = w->wl_next) {

            /* assume a match (have to reset done every time
             * through
             */
            done = 1;
            word = w->wl_word;

            if (!word || !*word) {
                break;
            }

            /* Break up word into type, subcircuit, model, device,
             * must be nodestructive to "word"
             */

            /* type */
            if (*word == ':' || *word == '#')
                type = '\0';
            else
                type = *word++;

            /* subcircuit */

            subckt = word;
            /* look for last ":" or "#" in word */
            for (p = word + strlen(word) /* do '\0' first time */;
                 p != word && *p != ':' && *p != '#'; p--)
            {
                ;
            }

            if (*p != ':' && *p != '#') {
                /* No subcircuit name specified */
                subckt = NULL;
                subckt_len = 0;
            } else {

                if (p[-1] == ':') {
                    head_match = 1;
                    subckt_len = (int)(p - word) - 1;
                } else {
                    head_match = 0;
                    subckt_len = (int)(p - word);
                }

                if (subckt_len == 0) {
                    /* Top level only */
                    if (head_match)
                        subckt = NULL;
                    else
                        subckt = Top_Level;
                }
                word = p + 1;
            }

            /* model or device */

            if (*p == '#') {
                model = word;
                device = NULL;
            } else {
                model = NULL;
                device = word;
            }

            /* Now compare */
            if (dg->instance)
                dev_name = dg->instance->GENname;
            else
                dev_name = NULL;

            if (dg->model)
                mod_name = dg->model->GENmodName;
            else
                mod_name = NULL;

            if (type) {
                if (!dev_name) {
                    done = 0;
                    /*printf("No device.\n");*/
                    need |= DGEN_MODEL;
                    continue;
                } else if (type != *dev_name) {
                    done = 0;
                    /*printf("Wrong type.\n");*/
                    /* Bleh ... plan breaks down here */
                    /* need = DGEN_TYPE; */
                    continue;
                }
            }

            if (subckt == Top_Level) {
                if (dev_name && dev_name[1] == ':') {
                    need |= DGEN_INSTANCE;
                    done = 0;
                    /*printf("Wrong level.\n");*/
                    continue;
                }
            } else if (subckt && (!dev_name || !ciprefix(subckt, dev_name + 1))) {
                need |= DGEN_INSTANCE;
                done = 0;
                /*printf("Wrong subckt.\n"); */
                continue;
            }

            if (device && *device) {
                need |= DGEN_INSTANCE | DGEN_MODEL;
                if (!dev_name) {
                    done = 0;
                    /*printf("Didn't get dev name.\n");*/
                    continue;
                } else if (strcmp(device, dev_name + 1 + subckt_len)) {
                    done = 0;
                    /*printf("Wrong name.\n");*/
                    continue;
                }
            } else if (model && *model) {
                if (strcmp(model, mod_name)) {
                    done = 0;
                    need |= DGEN_MODEL;
                    /*printf("Wrong model name.\n");*/
                    continue;
                }
            }

            break;
        }

    }

    if (done == 2)
        *dgx = NULL;
}