#include "global.h"
#include "interpret.h"
#include "stralloc.h"
#include "mapping.h"
#include "array.h"
#include "svalue.h"
#include "operators.h"
#include "array.h"
#include "builtin_functions.h"
#include "module.h"

#include <stdlib.h>
#ifndef DEFAULT_CMOD_STORAGE
#define DEFAULT_CMOD_STORAGE
#endif

// libpsyc dependencies
#include <psyc.h>
#include <psyc/parse.h>
#include <psyc/render.h>
#include <psyc/text.h>

#define MODULE_NAME "PSYC"
#define MODULE_MAJOR 0
#define MODULE_MINOR 2
#define MODULE_PATCH 0

/*! @module PSYC
 *!
 *! Implements PSYC parsing and rendering based on libpsyc
 *!
 */

// psyctext helper
PsycTextValueRC lookup_value_mapping(const char *name, size_t len, PsycString *value, void *extra)
{
	//printf("lookup_value_mapping called for %.*s\n", (int) len, name);
	struct pike_string *key = make_shared_binary_string(name, len);
	struct mapping *m = (struct mapping *) extra;
	struct svalue *s = low_mapping_string_lookup(m, key);
	free_string(key);

	if (s == NULL) {
		return PSYC_TEXT_VALUE_NOT_FOUND;
	}

	switch(s->type) {
	case PIKE_T_STRING:
		//printf("lookup returned %.*s\n", (int) s->u.string->len, STR0(s->u.string));
		value->data = (char *) STR0(s->u.string);
		value->length = s->u.string->len;
		break;
	default:
		printf("lookup did return !string\n");
		// FIXME: we need the automagic value conversion
		value->data = "";
		value->length = 0;
	}
	return PSYC_TEXT_VALUE_FOUND;
}

/*! @decl string psyc_text(string template, mapping vars)
 *! @param template
 *!	template to be filled
 *! @param vars
 *!	mapping(string:string) with substituions
 *! @returns
 *!	rendered string
 */
PIKEFUN string psyc_text(string template, mapping vars) {
	PsycTextState state;
	PsycTextRC ret;
	size_t len = 0;
	// FIXME:
	char buffer[512];

	psyc_text_state_init(&state, (char *) STR0(template), template->len, buffer, 512);
	do
	{
		ret = psyc_text(&state, lookup_value_mapping, vars);
		len += psyc_text_bytes_written(&state);
		switch (ret) {
		case PSYC_TEXT_INCOMPLETE: // need to realloc buffer
			//psyc_text_buffer_set(&state, buffer + len, BUFSIZE - len);
			break;
		case PSYC_TEXT_COMPLETE: // we're done
			RETURN make_shared_binary_string(buffer, len);
		case PSYC_TEXT_NO_SUBST: // no substituions, return original string
			RETURN template;
		}
	} while (ret == PSYC_TEXT_INCOMPLETE);
}

/*! @decl string is_routingvar(string name)
 *! @param name
 *!	name of the variable
 *! @returns
 *!	1 if it is a routing variable
 *!	0 otherwise
 */
PIKEFUN int is_routingvar(string name) {
	RETURN psyc_var_is_routing((char *) STR0(name), name->len);
}

/*! @decl string render(mapping rvars, mapping evars, string method, string|void body)
 *! @param rvars
 *!	routing vars (mapping string:string)
 *! @param evars
 *!	entity vars (mapping string:mixed
 *! @param method
 *!	method name
 *! @param data
 *!	body
 *! @returns
 *!	serialized packet as a string
 */
PIKEFUN string render(mapping rvars, mapping evars, string method, string|void body) {
	PsycPacket packet;
	PsycHeader rheaders, eheaders;

	struct keypair *k; // for mappings
	INT32 e;

	char oper = C_GLYPH_OPERATOR_SET;

	// fill headers
	rheaders.lines = 0;
	rheaders.modifiers = malloc(sizeof(PsycModifier) * rvars->data->size);
	NEW_MAPPING_LOOP(rvars->data) {
		if (k->ind.type == PIKE_T_STRING) {
			switch(k->val.type) {
			case PIKE_T_STRING:
				psyc_modifier_init(&rheaders.modifiers[rheaders.lines++], oper,
						   (char *)STR0(k->ind.u.string), k->ind.u.string->len,
						   (char *)STR0(k->val.u.string), k->val.u.string->len,
						   PSYC_MODIFIER_ROUTING);
				break;
			default:
				Pike_error("psyc render: unsupported non-string value in rvars\n");
				break;
			}
		} else {
			Pike_error("psyc render: unsupported non-string key in rvars\n");
		}
	}

	eheaders.lines = 0;
	eheaders.modifiers = malloc(sizeof(PsycModifier) * evars->data->size);
	NEW_MAPPING_LOOP(evars->data) {
		if (k->ind.type == PIKE_T_STRING) {
			char *key;
			size_t keylen;
			char *val = NULL;
			size_t vallen = 0;
			struct pike_string *s;

			key = (char *) STR0(k->ind.u.string);
			keylen = k->ind.u.string->len;

			switch(k->val.type) {
			case PIKE_T_INT:
				do {
					struct string_builder b;
					init_string_builder(&b, 0);
					string_builder_append_integer(&b, k->val.u.integer,
								      10, APPEND_SIGNED, 0, 0);
					s = finish_string_builder(&b);
					val = (char *) STR0(s);
					vallen = s->len;
					free_string(s);
				} while (0);
				break;
			case PIKE_T_STRING:
				val = (char *) STR0(k->val.u.string);
				vallen = k->val.u.string->len;
				break;
				/*
			case PIKE_T_FLOAT:
				printf("float value %f\n", k->val.u.float_number);
				break;
				*/
			case PIKE_T_ARRAY:
				do {
					PsycString *elems = xcalloc(k->val.u.array->size, sizeof(PsycString));
					PsycList list;
					// FIXME: check for out of memory
					for(e = 0; e < k->val.u.array->size; e++) {
						struct svalue item = k->val.u.array->item[e];
						switch(item.type) {
						case PIKE_T_STRING:
							elems[e] = (PsycString) { item.u.string->len, (char *) STR0(item.u.string) };
							break;
						default:
							// FIXME: xfree(elems) ?
							Pike_error("psyc_render: unsupported data type in list\n");
						}
					}
					psyc_list_init(&list, elems, k->val.u.array->size, PSYC_LIST_CHECK_LENGTH);

					struct pike_string *listbuf = begin_shared_string(list.length);
					psyc_render_list(&list, (char *) STR0(listbuf), listbuf->len);
					end_shared_string(listbuf);
					val = (char *) STR0(listbuf);
					vallen = listbuf->len;
					xfree(elems);
				} while (0);
				break;
			default:
				Pike_error("psyc_render: unsupported value in evars\n");
				break;
			}
			psyc_modifier_init(&eheaders.modifiers[eheaders.lines++], oper,
					   key, keylen,
					   val, vallen,
					   PSYC_MODIFIER_CHECK_LENGTH);
		} else {
			Pike_error("psyc render: unsupported non-string key in evars\n");
		}
	}

	if (body != NULL) {
		psyc_packet_init(&packet, rheaders.modifiers, rheaders.lines,
				 eheaders.modifiers, eheaders.lines,
				 (const char *)STR0(method), method->len,
				 (const char *)STR0(body), body->len,
				 PSYC_PACKET_CHECK_LENGTH);
	} else { // body arg was not given
		psyc_packet_init(&packet, rheaders.modifiers, rheaders.lines,
				 eheaders.modifiers, eheaders.lines,
				 (const char *)STR0(method), method->len,
				 NULL, 0, PSYC_PACKET_CHECK_LENGTH);
	}

	struct pike_string *s = begin_shared_string(packet.length);
	psyc_render(&packet, (char *) STR0(s), packet.length);
	// pop_n_elems(args);
	RETURN end_shared_string(s);
}

PIKECLASS Parser {
	CVAR PsycParseState parser;
	CVAR struct pike_string *buffer;
	CVAR int handle_packet;
	CVAR int handle_error;

	// packet state
	CVAR struct mapping *rvars;
	CVAR struct mapping *evars;
	CVAR struct pike_string *method;
	CVAR struct pike_string *body;

	// for incomplete length prefixed entity var data / body data
	CVAR struct string_builder incomplete;

	INIT {
		psyc_parse_state_init(&THIS->parser, PSYC_PARSE_ALL);
		THIS->buffer = NULL;
		THIS->handle_packet = find_identifier("handle_packet", Pike_fp->current_object->prog);
		THIS->handle_error = find_identifier("handle_error", Pike_fp->current_object->prog);
		THIS->rvars = allocate_mapping(0);
		THIS->evars = allocate_mapping(0);
		THIS->method = NULL;
		THIS->body = NULL;
		//THIS->body_buffer = NULL;
	}

	EXIT {
		if (THIS->buffer != NULL) {
			free_string(THIS->buffer);
		}
		if (THIS->rvars != NULL) {
			do_free_mapping(THIS->rvars);
		}
		// FIXME: free packet state
	}

	PIKEFUN void feed(string data) {
		char oper;
		PsycString name, value;
		int ret;
		int err;

		if (THIS->buffer != NULL) {
			/* we have remaining buffer from previous input */
			//printf("%d bytes remaining from previous read\n", THIS->buffer->len);
			struct pike_string *tmp;
			tmp = add_shared_strings(THIS->buffer, data);
			free_string(THIS->buffer);
			data = tmp;
			THIS->buffer = NULL;
		}
		psyc_parse_buffer_set(&THIS->parser,
				     (char *) STR0(data), data->len);
		do {
			ret = psyc_parse(&THIS->parser, &oper, &name, &value);
			switch(ret) {
			case PSYC_PARSE_ROUTING:
				// printf("R %.*s -> %.*s\n", (int)name.length, name.data, (int)value.length, value.data);
				mapping_string_insert_string(THIS->rvars,
							     make_shared_binary_string(name.data, name.length),
							     make_shared_binary_string(value.data, value.length));
				break;
			case PSYC_PARSE_ENTITY_START: // entity var with length
				init_string_builder_alloc(&THIS->incomplete, psyc_parse_value_length(&THIS->parser), 0);
				// fall thru
			case PSYC_PARSE_ENTITY_CONT:
				string_builder_append(&THIS->incomplete, MKPCHARP(value.data, 0), value.length);
				break;
			case PSYC_PARSE_ENTITY_END:
				string_builder_append(&THIS->incomplete, MKPCHARP(value.data, 0), value.length);
				do {
					struct pike_string *tmp = finish_string_builder(&THIS->incomplete);
					value.length = tmp->len;
					value.data = (char *) STR0(tmp);
					// FIXME: not sure if this is really safe
					free_string(tmp);
				} while (0);
				// fall thru
			case PSYC_PARSE_ENTITY:
				//printf("E %.*s -> %.*s\n", (int)name.length, name.data, (int)value.length, value.data);
				do {
					err = 0;
					int type = psyc_var_type(PSYC_S2ARG(&name));
					struct svalue sv;
					time_t timmy;
					switch(type) {
					case PSYC_TYPE_DATE:
						if (psyc_parse_date(&value, &timmy)) {
							sv.type = PIKE_T_INT; sv.u.integer = timmy;
							mapping_string_insert(THIS->evars,
								     make_shared_binary_string(name.data, name.length),
								     &sv);
						} else {
							err = 1;
						}
						break;
					case PSYC_TYPE_TIME:
						if (psyc_parse_time(&value, &timmy)) {
							sv.type = PIKE_T_INT; sv.u.integer = timmy;
							mapping_string_insert(THIS->evars,
								     make_shared_binary_string(name.data, name.length),
								     &sv);
						} else {
							err = 2;
						}
						break;
					case PSYC_TYPE_AMOUNT:
						break;
					case PSYC_TYPE_DEGREE:
						if (value.length && value.data[0] >= '0' && value.data[0] <= '9') {
							sv.type = PIKE_T_FLOAT; sv.u.float_number = (float) (value.data[0] - '0') / 10.0;
							mapping_string_insert(THIS->evars,
								     make_shared_binary_string(name.data, name.length),
								     &sv);
						} else {
							err = 3;
						}
						break;
					case PSYC_TYPE_FLAG:
						if (value.length && value.data[0] >= '0' && value.data[0] <= '1') {
							sv.type = PIKE_T_INT; sv.u.integer = value.data[0] - '0';
							mapping_string_insert(THIS->evars,
								     make_shared_binary_string(name.data, name.length),
								     &sv);
						} else {
							err = 4;
						}
						break;
					case PSYC_TYPE_LIST:
						do {
							struct array *elems = low_allocate_array(0, 32);
							if (value.length > 0) {
								int retl;
								int count = 0;
								PsycParseListState listState;
								PsycString elem = (PsycString) {0, 0};

								psyc_parse_list_state_init(&listState);
								psyc_parse_list_buffer_set(&listState, PSYC_S2ARG(value));
								do {
									retl = psyc_parse_list(&listState, &elem);
									switch(retl) {
									case PSYC_PARSE_LIST_END: // last element
										retl = 0;
									case PSYC_PARSE_LIST_ELEM:
										sv.type = PIKE_T_STRING; sv.u.string = make_shared_binary_string(elem.data, elem.length);
										elems = array_insert(elems, &sv, count++);
										break;
									default:
										err = 5;
										break;
									}
								} while (retl > 0 && !err);
							}
							if (!err) {
								sv.type = PIKE_T_ARRAY;
								sv.u.array = elems;
								mapping_string_insert(THIS->evars,
									     make_shared_binary_string(name.data, name.length),
									     &sv);
							}
							free_array(elems);
						} while (0);
						break;
					default: // string
						mapping_string_insert_string(THIS->evars,
							     make_shared_binary_string(name.data, name.length),
							     make_shared_binary_string(value.data, value.length));
					}
				} while (0);
				if (err) { // there was an error while
					// FIXME
					return;
				}
				break;
			case PSYC_PARSE_BODY_START: // if length was given this is used for body
				init_string_builder_alloc(&THIS->incomplete, psyc_parse_value_length(&THIS->parser), 0);
			case PSYC_PARSE_BODY_CONT:
				string_builder_append(&THIS->incomplete, MKPCHARP(value.data, 0), value.length);
				break;
			case PSYC_PARSE_BODY_END:
				string_builder_append(&THIS->incomplete, MKPCHARP(value.data, 0), value.length);
				do {
					struct pike_string *tmp = finish_string_builder(&THIS->incomplete);
					value.length = tmp->len;
					value.data = (char *) STR0(tmp);
					// FIXME: not sure if this is really safe
					free_string(tmp);
				} while (0);
				// fall thru
			case PSYC_PARSE_BODY:
				THIS->method = make_shared_binary_string(name.data, name.length);
				THIS->body = make_shared_binary_string(value.data, value.length);
				break;
			case PSYC_PARSE_COMPLETE: // apply the callback
				push_mapping(THIS->rvars);
				push_mapping(THIS->evars);
				if (THIS->method == NULL) {
					apply_low(Pike_fp->current_object, THIS->handle_packet, 2);
				} else if (THIS->body == NULL) {
					push_string(THIS->method);
					apply_low(Pike_fp->current_object, THIS->handle_packet, 3);
				} else {
					push_string(THIS->method);
					push_string(THIS->body);
					apply_low(Pike_fp->current_object, THIS->handle_packet, 4);
				}

				// reset packet state
				THIS->rvars = allocate_mapping(0);
				THIS->evars = allocate_mapping(0);
				THIS->method = NULL;
				THIS->body = NULL;
				break;
			case PSYC_PARSE_INSUFFICIENT: // not enough data
				if (psyc_parse_remaining_buffer(&THIS->parser) > 0) {
					THIS->buffer = make_shared_binary_string(psyc_parse_remaining_buffer(&THIS->parser),
										 psyc_parse_remaining_length(&THIS->parser));
				}
				return;
			default: // fatal error
				push_int(ret);
				apply_low(Pike_fp->current_object, THIS->handle_error, 1);
				// FIXME: free stuff? or do we kill the socket and parser anyway
				return;
			}
		} while (1);
	}

}

INIT {

}

EXTRA {
	add_integer_constant("__version_major", MODULE_MAJOR, 0);
	add_integer_constant("__version_minor", MODULE_MAJOR, 0);
	add_integer_constant("__version_patch", MODULE_MAJOR, 0);
}