/*
Copyright (c) 1998-2015, Enno Rehling <enno@eressea.de>
Katja Zedel <katze@felidae.kn-bremen.de
Christian Schlittchen <corwin@amber.kn-bremen.de>

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
**/

#include <platform.h>
#include "messages.h"

/* kernel includes */
#include "building.h"
#include "faction.h"
#include "item.h"
#include "order.h"
#include "plane.h"
#include "region.h"
#include "unit.h"

/* util includes */
#include <util/base36.h>
#include <util/goodies.h>
#include <util/language.h>
#include <util/macros.h>
#include <util/message.h>
#include <util/nrmessage.h>
#include <util/crmessage.h>
#include <util/log.h>

/* libc includes */
#include <stddef.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>

#define MAXSTRLEN (4*DISPLAYSIZE+3)

static void
arg_set(variant args[], const message_type * mtype, const char *buffer,
variant v)
{
    int i;
    for (i = 0; i != mtype->nparameters; ++i) {
        if (!strcmp(buffer, mtype->pnames[i]))
            break;
    }
    if (i != mtype->nparameters) {
        args[i] = v;
    }
    else {
        log_error("invalid parameter %s for message type %s\n", buffer,
            mtype->name);
        assert(!"program aborted.");
    }
}

static int missing_message_mode;

void message_handle_missing(int mode) {
    missing_message_mode = mode;
}

static message *missing_feedback(const char *name, const struct unit *u,
    const struct region *r, struct order *ord)
{
    if (missing_message_mode == MESSAGE_MISSING_ERROR) {
        log_error("trying to create undefined feedback of type \"%s\"\n", name);
    }
    else if (missing_message_mode == MESSAGE_MISSING_REPLACE) {
        if (strcmp(name, "missing_feedback") != 0) {
            if (!mt_find("missing_feedback")) {
                mt_create_va(mt_new("missing_feedback", NULL), "unit:unit",
                    "region:region", "command:order", "name:string", MT_NEW_END);
            }
            return msg_message("missing_feedback", "unit region command name", u, r, ord, name);
        }
    }
    return NULL;
}

static message *missing_message(const char *name) {
    if (missing_message_mode == MESSAGE_MISSING_ERROR) {
        log_error("trying to create undefined message of type \"%s\"\n", name);
    }
    else if (missing_message_mode == MESSAGE_MISSING_REPLACE) {
        log_warning("trying to create undefined message of type \"%s\"\n", name);
        if (strcmp(name, "missing_message") != 0) {
            if (!mt_find("missing_message")) {
                mt_create_va(mt_new("missing_message", NULL), "name:string", MT_NEW_END);
            }
            return msg_message("missing_message", "name", name);
        }
    }
    return NULL;
}

struct message *msg_feedback(const struct unit *u, struct order *ord,
    const char *name, const char *sig, ...)
{
    const message_type *mtype = mt_find(name);
    variant args[16];
    variant var;
    memset(args, 0, sizeof(args));

    if (ord && is_silent(ord)) {
        return NULL;
    }

    if (!mtype) {
        return missing_feedback(name, u, u->region, ord);
    }

    var.v = (void *)u;
    arg_set(args, mtype, "unit", var);
    var.v = (void *)u->region;
    arg_set(args, mtype, "region", var);
    var.v = (void *)ord;
    arg_set(args, mtype, "command", var);

    if (sig) {
        const char *ic = sig;
        va_list marker;

        va_start(marker, sig);
        while (*ic && !isalnum(*ic))
            ic++;
        while (*ic) {
            char paramname[64];
            char *oc = paramname;
            int i;

            while (isalnum(*ic))
                *oc++ = *ic++;
            *oc = '\0';

            for (i = 0; i != mtype->nparameters; ++i) {
                if (!strcmp(paramname, mtype->pnames[i]))
                    break;
            }
            if (i != mtype->nparameters) {
                if (mtype->types[i]->vtype == VAR_VOIDPTR) {
                    args[i].v = va_arg(marker, void *);
                }
                else if (mtype->types[i]->vtype == VAR_INT) {
                    args[i].i = va_arg(marker, int);
                }
                else {
                    assert(!"unknown variant type");
                }
            }
            else {
                log_error("invalid parameter %s for message type %s\n", paramname, mtype->name);
                assert(!"program aborted.");
            }
            while (*ic && !isalnum(*ic))
                ic++;
        }
        va_end(marker);
    }
    return msg_create(mtype, args);
}

message *msg_message(const char *name, const char *sig, ...)
/* msg_message("oops_error", "unit region command", u, r, cmd) */
{
    va_list vargs;
    const message_type *mtype = mt_find(name);
    char paramname[64];
    const char *ic = sig;
    int argnum=0;
    variant args[16];
    memset(args, 0, sizeof(args));

    if (!mtype) {
        return missing_message(name);
    }

    va_start(vargs, sig);
    while (*ic && !isalnum(*ic))
        ic++;
    while (*ic) {
        char *oc = paramname;
        int i;

        while (isalnum(*ic))
            *oc++ = *ic++;
        *oc = '\0';

        for (i = 0; i != mtype->nparameters; ++i) {
            if (!strcmp(paramname, mtype->pnames[i]))
                break;
        }
        if (i != mtype->nparameters) {
            if (mtype->types[i]->vtype == VAR_VOIDPTR) {
                args[i].v = va_arg(vargs, void *);
            }
            else if (mtype->types[i]->vtype == VAR_INT) {
                args[i].i = va_arg(vargs, int);
            }
            else {
                assert(!"unknown variant type");
            }
            argnum++;
        }
        else {
            log_error("invalid parameter %s for message type %s\n", paramname, mtype->name);
        }
        while (*ic && !isalnum(*ic))
            ic++;
    }
    va_end(vargs);
    if (argnum !=  mtype->nparameters) {
        log_error("not enough parameters for message type %s\n", mtype->name);
    }

    return msg_create(mtype, args);
}

static void
caddmessage(region * r, faction * f, const char *s, msg_t mtype, int level)
{
    message *m = NULL;

    UNUSED_ARG(level);
    switch (mtype) {
    case MSG_BATTLE:
        assert(0 || !"battle messages must not use addmessage");
        break;
    case MSG_MAGIC:
    case MSG_MESSAGE:
    case MSG_EVENT:
        /* Botschaften an REGION oder einzelne PARTEI */
        m = msg_message("msg_event", "string", s);
        if (!r) {
            assert(f);
            m = add_message(&f->msgs, m);
        }
        else {
            if (f == NULL)
                add_message(&r->msgs, m);
            else
                r_addmessage(r, f, m);
        }
        break;
    default:
        assert(!"invalid message class");
    }
    if (m)
        msg_release(m);
}

void addmessage(region * r, faction * f, const char *s, msg_t mtype, int level)
{
    caddmessage(r, f, s, mtype, level);
}

message * msg_error(const unit * u, struct order *ord, int mno) {
    static char msgname[20];

    if (u->faction->flags & FFL_NPC) {
        return NULL;
    }
    sprintf(msgname, "error%d", mno);
    return msg_feedback(u, ord, msgname, "");
}

void cmistake(const unit * u, struct order *ord, int mno, int mtype)
{
    message * msg;
    UNUSED_ARG(mtype);
    msg = msg_error(u, ord, mno);
    if (msg) {
        ADDMSG(&u->faction->msgs, msg);
    }
}

void syntax_error(const struct unit *u, struct order *ord)
{
    message * result;
    result = msg_error(u, ord, 10);
    if (result) {
        ADDMSG(&u->faction->msgs, result);
    }
}

void free_messagelist(mlist *msgs)
{
    struct mlist **mlistptr;
    for (mlistptr = &msgs; *mlistptr;) {
        struct mlist *ml = *mlistptr;
        *mlistptr = ml->next;
        msg_release(ml->msg);
        free(ml);
    }
}

message *add_message(message_list ** pm, message * m)
{
    assert(m && m->type);
    if (m != NULL) {
        struct mlist *mnew = malloc(sizeof(struct mlist));
        if (*pm == NULL) {
            *pm = malloc(sizeof(message_list));
            (*pm)->end = &(*pm)->begin;
        }
        mnew->msg = msg_addref(m);
        mnew->next = NULL;
        *((*pm)->end) = mnew;
        (*pm)->end = &mnew->next;
    }
    return m;
}

struct mlist ** merge_messages(message_list *mlist, message_list *append) {
    struct mlist **split = 0;
    assert(mlist);
    if (append) {
        split = mlist->end;
        *split = append->begin;
        mlist->end = append->end;
    }
    return split;
}

void split_messages(message_list *mlist, struct mlist **split) {
    assert(mlist);
    if (split) {
        *split = 0;
        mlist->end = split;
    }
}