#include <ctype.h>

#include "main.h"
#include "headers.h"
#include "docs.h"

extern char* _eolian_api_symbol;

static Eina_Strbuf *
_type_generate(const Eolian_State *state, const Eolian_Typedecl *tp,
               Eina_Bool full)
{
   char *grp = strdup(eolian_typedecl_c_name_get(tp));
   char *p = strrchr(grp, '.');
   if (p) *p = '\0';
   Eina_Strbuf *buf = eo_gen_docs_full_gen(state, eolian_typedecl_documentation_get(tp),
                                           grp, 0);
   free(grp);
   if (!buf) buf = eina_strbuf_new();
   else eina_strbuf_append_char(buf, '\n');
   Eolian_Typedecl_Type tpt = eolian_typedecl_type_get(tp);
   switch (tpt)
     {
      case EOLIAN_TYPEDECL_ALIAS:
        {
           Eina_Stringshare *tn = eolian_typedecl_c_type_get(tp);
           eina_strbuf_append(buf, tn);
           eina_stringshare_del(tn);
           break;
        }
      case EOLIAN_TYPEDECL_STRUCT:
      case EOLIAN_TYPEDECL_STRUCT_OPAQUE:
        {
           const Eolian_Struct_Type_Field *memb;
           char *fn = eo_gen_c_full_name_get(eolian_typedecl_c_name_get(tp));
           if (tpt == EOLIAN_TYPEDECL_STRUCT_OPAQUE || !full)
             {
                eina_strbuf_append_printf(buf, "typedef struct _%s %s", fn, fn);
                free(fn);
                break;
             }
           eina_strbuf_append_printf(buf, "typedef struct _%s\n{\n", fn);
           Eina_Iterator *membs = eolian_typedecl_struct_fields_get(tp);
           EINA_ITERATOR_FOREACH(membs, memb)
             {
                Eina_Stringshare *ct = NULL;
                ct = eolian_typedecl_struct_field_c_type_get(memb);
                eina_strbuf_append_printf(buf, "  %s%s%s;",
                   ct, strchr(ct, '*') ? "" : " ",
                   eolian_typedecl_struct_field_name_get(memb));
                eina_stringshare_del(ct);
                const Eolian_Documentation *fdoc
                   = eolian_typedecl_struct_field_documentation_get(memb);
                 if (fdoc)
                   {
                      const char *nl = strrchr(eina_strbuf_string_get(buf), '\n');
                      if (nl)
                        {
                           Eina_Strbuf *fbuf = eo_gen_docs_full_gen(state, fdoc, NULL,
                              strlen(nl));
                           if (fbuf)
                             eina_strbuf_append_printf(buf, " %s",
                                eina_strbuf_string_get(fbuf));
                           eina_strbuf_free(fbuf);
                        }
                   }
                eina_strbuf_append(buf, "\n");
             }
           eina_iterator_free(membs);
           eina_strbuf_append_printf(buf, "} %s", fn);
           free(fn);
           break;
        }
      case EOLIAN_TYPEDECL_ENUM:
        {
           const Eolian_Enum_Type_Field *memb;
           if (!full)
             break;
           eina_strbuf_append_printf(buf, "typedef enum\n{\n");
           Eina_Iterator *membs = eolian_typedecl_enum_fields_get(tp);
           Eina_Bool next = eina_iterator_next(membs, (void **)&memb);
           while (next)
             {
                const Eolian_Expression *vale =
                   eolian_typedecl_enum_field_value_get(memb, EINA_FALSE);
                Eina_Stringshare *membn =
                   eolian_typedecl_enum_field_c_constant_get(memb);
                if (!vale)
                  eina_strbuf_append_printf(buf, "  %s", membn);
                else
                  {
                     Eolian_Value val =
                        eolian_expression_eval(vale, EOLIAN_MASK_INT);
                     const char *lit = eolian_expression_value_to_literal(&val);
                     eina_strbuf_append_printf(buf, "  %s = %s", membn, lit);
                     const char *exp = eolian_expression_serialize(vale);
                     if (exp && strcmp(lit, exp))
                       eina_strbuf_append_printf(buf, " /* %s */", exp);
                     eina_stringshare_del(exp);
                     eina_stringshare_del(lit);
                  }
                eina_stringshare_del(membn);
                const Eolian_Documentation *fdoc
                   = eolian_typedecl_enum_field_documentation_get(memb);
                next = eina_iterator_next(membs, (void **)&memb);
                if (next)
                  eina_strbuf_append(buf, ",");
                if (fdoc)
                  {
                     const char *nl = strrchr(eina_strbuf_string_get(buf), '\n');
                     if (nl)
                       {
                          Eina_Strbuf *fbuf = eo_gen_docs_full_gen(state, fdoc, NULL,
                             strlen(nl));
                          if (fbuf)
                            eina_strbuf_append_printf(buf, " %s",
                               eina_strbuf_string_get(fbuf));
                          eina_strbuf_free(fbuf);
                       }
                  }
                eina_strbuf_append(buf, "\n");
             }
           eina_iterator_free(membs);
           char *fn = eo_gen_c_full_name_get(eolian_typedecl_c_name_get(tp));
           eina_strbuf_append_printf(buf, "} %s", fn);
           free(fn);
           break;
        }
      case EOLIAN_TYPEDECL_FUNCTION_POINTER:
        {
           const Eolian_Function *fid = eolian_typedecl_function_pointer_get(tp);

           eina_strbuf_append(buf, "typedef ");

           /* Return type */
           const Eolian_Type *rtp = eolian_function_return_type_get(fid, EOLIAN_FUNCTION_POINTER);
           if (!rtp)
             eina_strbuf_append(buf, "void ");
           else
             {
                Eina_Stringshare *ct = eolian_function_return_c_type_get(fid, EOLIAN_FUNCTION_POINTER);
                eina_strbuf_append_printf(buf, "%s ", ct);
                eina_stringshare_del(ct);
             }

           /* Function name */
           char *fn = eo_gen_c_full_name_get(eolian_typedecl_c_name_get(tp));
           eina_strbuf_append_printf(buf, "(*%s)", fn);
           free(fn);

           /* Parameters */
           eina_strbuf_append(buf, "(void *data");
           int nidx = 1;
           eo_gen_params(eolian_function_parameters_get(fid), buf, NULL, &nidx, EOLIAN_FUNCTION_POINTER);
           eina_strbuf_append(buf, ")");

           break;
        }
      default:
        eina_strbuf_reset(buf);
        break;
     }
   eina_strbuf_append_char(buf, ';');
   if (eolian_typedecl_is_beta(tp))
     {
        eina_strbuf_prepend(buf, "#ifdef EFL_BETA_API_SUPPORT\n");
        eina_strbuf_append(buf, "\n#endif /* EFL_BETA_API_SUPPORT */");
     }
   return buf;
}

static Eina_Strbuf *
_const_generate(const Eolian_State *state, const Eolian_Constant *vr)
{
   char *fn = strdup(eolian_constant_c_name_get(vr));
   char *p = strrchr(fn, '.');
   if (p) *p = '\0';
   Eina_Strbuf *buf = eo_gen_docs_full_gen(state, eolian_constant_documentation_get(vr),
                                           fn, 0);
   if (p)
     {
        *p = '_';
        while ((p = strchr(fn, '.')))
          *p = '_';
     }
   eina_str_toupper(&fn);
   if (!buf) buf = eina_strbuf_new();
   else eina_strbuf_append_char(buf, '\n');

   /* we generate a define macro here, as it's a constant */
   eina_strbuf_prepend_printf(buf, "#ifndef %s\n", fn);
   eina_strbuf_append_printf(buf, "#define %s ", fn);
   const Eolian_Expression *vv = eolian_constant_value_get(vr);
   Eolian_Value val = eolian_expression_eval(vv, EOLIAN_MASK_ALL);
   Eina_Stringshare *lit = eolian_expression_value_to_literal(&val);
   eina_strbuf_append(buf, lit);
   Eina_Stringshare *exp = eolian_expression_serialize(vv);
   if (exp && strcmp(lit, exp))
     eina_strbuf_append_printf(buf, " /* %s */", exp);
   eina_stringshare_del(lit);
   eina_stringshare_del(exp);
   eina_strbuf_append(buf, "\n#endif");

   free(fn);
   if (eolian_constant_is_beta(vr))
     {
        eina_strbuf_prepend(buf, "#ifdef EFL_BETA_API_SUPPORT\n");
        eina_strbuf_append(buf, "\n#endif /* EFL_BETA_API_SUPPORT */");
     }
   return buf;
}

static Eina_Strbuf *
_err_generate(const Eolian_State *state, const Eolian_Error *err)
{
   char *fn = strdup(eolian_error_c_name_get(err));
   char *p = strrchr(fn, '.');
   if (p) *p = '\0';
   Eina_Strbuf *buf = eo_gen_docs_full_gen(state, eolian_error_documentation_get(err),
                                           fn, 0);
   if (p)
     {
        *p = '_';
        while ((p = strchr(fn, '.')))
          *p = '_';
     }
   eina_str_tolower(&fn);
   if (!buf) buf = eina_strbuf_new();
   else eina_strbuf_append_char(buf, '\n');

   eina_strbuf_prepend_printf(buf, "%s %s_WEAK Eina_Error %s_get(void);\n\n",
                              _eolian_api_symbol, _eolian_api_symbol, fn);

   char *ufn = strdup(fn);
   eina_str_toupper(&ufn);
   eina_strbuf_append_printf(buf, "#define %s %s_get()", ufn, fn);
   free(ufn);
   free(fn);

   if (eolian_error_is_beta(err))
     {
        eina_strbuf_prepend(buf, "#ifdef EFL_BETA_API_SUPPORT\n");
        eina_strbuf_append(buf, "\n#endif /* EFL_BETA_API_SUPPORT */");
     }
   return buf;
}

void eo_gen_types_header_gen(const Eolian_State *state,
                             Eina_Iterator *itr, Eina_Strbuf *buf,
                             Eina_Bool full)
{
   const Eolian_Object *decl;
   EINA_ITERATOR_FOREACH(itr, decl)
     {
        Eolian_Object_Type dt = eolian_object_type_get(decl);

        if (dt == EOLIAN_OBJECT_CONSTANT)
          {
             const Eolian_Constant *vr = (const Eolian_Constant *)decl;
             if (!vr || eolian_constant_is_extern(vr))
               continue;

             Eina_Strbuf *vbuf = _const_generate(state, vr);
             if (vbuf)
               {
                  eina_strbuf_append(buf, eina_strbuf_string_get(vbuf));
                  eina_strbuf_append(buf, "\n\n");
                  eina_strbuf_free(vbuf);
               }
             continue;
          }
        else if (dt == EOLIAN_OBJECT_ERROR)
          {
             const Eolian_Error *err = (const Eolian_Error *)decl;
             if (!err || eolian_error_is_extern(err))
               continue;

             Eina_Strbuf *ebuf = _err_generate(state, err);
             if (ebuf)
               {
                  eina_strbuf_append(buf, eina_strbuf_string_get(ebuf));
                  eina_strbuf_append(buf, "\n\n");
                  eina_strbuf_free(ebuf);
               }
             continue;
          }

        if (dt != EOLIAN_OBJECT_TYPEDECL)
          continue;

        const Eolian_Typedecl *tp = (const Eolian_Typedecl *)decl;

        if (eolian_typedecl_is_extern(tp))
          continue;

        Eolian_Typedecl_Type tpt = eolian_typedecl_type_get(tp);

        if (tpt == EOLIAN_TYPEDECL_ENUM && !full)
          continue;

        if (tpt == EOLIAN_TYPEDECL_ALIAS)
          {
             const Eolian_Type *btp = eolian_typedecl_base_type_get(tp);
             if (eolian_type_type_get(btp) == EOLIAN_TYPE_UNDEFINED)
               continue;
          }

        Eina_Strbuf *tbuf = _type_generate(state, tp, full);
        if (tbuf)
          {
             eina_strbuf_append(buf, eina_strbuf_string_get(tbuf));
             eina_strbuf_append(buf, "\n\n");
             eina_strbuf_free(tbuf);
          }
     }
   eina_iterator_free(itr);
}

static void
_source_gen_error(Eina_Strbuf *buf, const Eolian_Error *err)
{
   if (eolian_error_is_extern(err))
     return;

   char *fn = strdup(eolian_error_c_name_get(err));
   for (char *p = strchr(fn, '.'); p; p = strchr(p, '.'))
     *p = '_';
   eina_str_tolower(&fn);

   eina_strbuf_append_printf(buf, "%s %s_WEAK Eina_Error %s_get(void)\n{\n",
                             _eolian_api_symbol, _eolian_api_symbol, fn);
   free(fn);

   const char *msg = eolian_error_message_get(err);
   eina_strbuf_append(buf, "   static Eina_Error err = EINA_ERROR_NO_ERROR;\n");
   eina_strbuf_append(buf, "   if (err == EINA_ERROR_NO_ERROR)\n");
   eina_strbuf_append(buf, "     err = eina_error_msg_static_register(\"");
   for (const char *p = msg; *p; ++p)
     switch (*p)
       {
        case '\\':
        case '\'':
        case '\"':
          {
             eina_strbuf_append_char(buf, '\\');
             eina_strbuf_append_char(buf, *p);
             continue;
          }
        case '\n':
          {
             eina_strbuf_append_char(buf, '\\');
             eina_strbuf_append_char(buf, 'n');
             continue;
          }
        case '\t':
          {
             eina_strbuf_append_char(buf, '\\');
             eina_strbuf_append_char(buf, 't');
             continue;
          }
        default:
          {
             if (isprint(*p))
               eina_strbuf_append_char(buf, *p);
             else
               eina_strbuf_append_printf(buf, "\\x%2X", (unsigned int)*p);
             continue;
          }
       }
   eina_strbuf_append(buf, "\");\n");
   eina_strbuf_append(buf, "   return err;\n}\n\n");
}

void eo_gen_types_source_gen(Eina_Iterator *itr, Eina_Strbuf *buf)
{
   const Eolian_Object *decl;
   EINA_ITERATOR_FOREACH(itr, decl)
     {
        Eolian_Object_Type dt = eolian_object_type_get(decl);

        if (dt == EOLIAN_OBJECT_ERROR)
          _source_gen_error(buf, (const Eolian_Error *)decl);
     }
   eina_iterator_free(itr);
}

Eina_Strbuf *eo_gen_class_typedef_gen(const Eolian_State *eos, const char *eof)
{
   const Eolian_Class *cl = eolian_state_class_by_file_get(eos, eof);
   if (!cl)
     return NULL;
   char *clfn = eo_gen_c_full_name_get(eolian_class_c_name_get(cl));
   if (!clfn)
     return NULL;
   Eina_Strbuf *ret = eina_strbuf_new();
   eina_strbuf_append_printf(ret, "typedef Eo %s;\n", clfn);
   free(clfn);
   return ret;
}