#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

#include <JavaScriptCore/JavaScript.h>

#include "linenoise.h"

#include "zip.h"

#define CONSOLE_LOG_BUF_SIZE 1000
char console_log_buf[CONSOLE_LOG_BUF_SIZE];

JSStringRef to_string(JSContextRef ctx, JSValueRef val);
JSValueRef evaluate_script(JSContextRef ctx, char *script, char *source);

JSValueRef evaluate_source(JSContextRef ctx, char *type, char *source_value, bool expression, char *set_ns);
char *munge(char *s);

void bootstrap(JSContextRef ctx, char *deps_file_path, char *goog_base_path);
JSObjectRef get_function(JSContextRef ctx, char *namespace, char *name);

char* get_contents(char *path);

void debug_print_value(char *prefix, JSContextRef ctx, JSValueRef exception) {
#ifdef DEBUG
	if (exception != NULL) {
		JSStringRef ex_str = to_string(ctx, exception);
		char ex_buf[1000];
		ex_buf[0] = '\0';
		JSStringGetUTF8CString(ex_str, ex_buf, 1000-1);
		printf("%s: %s\n", prefix, ex_buf);
		JSStringRelease(ex_str);
	}
#endif
}

JSValueRef function_console_log(JSContextRef ctx, JSObjectRef function, JSObjectRef this_object,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	for (int i = 0; i < argc; i++) {
		if (i > 0) {
			fprintf(stdout, " ");
		}

		JSStringRef str = to_string(ctx, args[i]);
		JSStringGetUTF8CString(str, console_log_buf, CONSOLE_LOG_BUF_SIZE);
		fprintf(stdout, "%s", console_log_buf);
	}
	fprintf(stdout, "\n");

	return JSValueMakeUndefined(ctx);
}

JSValueRef function_console_error(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	for (int i = 0; i < argc; i++) {
		if (i > 0) {
			fprintf(stderr, " ");
		}

		JSStringRef str = to_string(ctx, args[i]);
		JSStringGetUTF8CString(str, console_log_buf, CONSOLE_LOG_BUF_SIZE);
		fprintf(stderr, "%s", console_log_buf);
	}
	fprintf(stderr, "\n");

	return JSValueMakeUndefined(ctx);
}

JSValueRef function_read_file(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	// TODO: implement fully
	fprintf(stderr, "WARN: %s: stub\n", __func__);

	if (argc == 1 && JSValueGetType(ctx, args[0]) == kJSTypeString) {
		char path[100];
		JSStringRef path_str = JSValueToStringCopy(ctx, args[0], NULL);
		JSStringGetUTF8CString(path_str, path, 100);
		JSStringRelease(path_str);

		debug_print_value
	("read_file", ctx, args[0]);

		char full_path[150];
		// TODO: should not load from here?
		snprintf(full_path, 150, "%s/%s", "out", path);

		char *contents = get_contents(full_path);
		JSStringRef contents_str = JSStringCreateWithUTF8CString(contents);
		free(contents);

		JSValueRef res[2];
		res[0] = JSValueMakeString(ctx, contents_str);
		res[1] = JSValueMakeNumber(ctx, 0);
		return JSObjectMakeArray(ctx, 2, res, NULL);
	}

	return JSValueMakeNull(ctx);
}

JSValueRef function_load(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	// TODO: implement fully
	fprintf(stderr, "WARN: %s: stub\n", __func__);

	if (argc == 1 && JSValueGetType(ctx, args[0]) == kJSTypeString) {
		char path[100];
		JSStringRef path_str = JSValueToStringCopy(ctx, args[0], NULL);
		JSStringGetUTF8CString(path_str, path, 100);
		JSStringRelease(path_str);

		debug_print_value
	("load", ctx, args[0]);

		char full_path[150];
		// TODO: should not load from here?
		snprintf(full_path, 150, "%s/%s", "out", path);

		JSValueRef contents_val = NULL;

		char *contents = get_contents(full_path);
		if (contents != NULL) {
			JSStringRef contents_str = JSStringCreateWithUTF8CString(contents);
			free(contents);

			contents_val = JSValueMakeString(ctx, contents_str);
		}

		JSValueRef res[2];
		res[0] = contents_val;
		res[1] = JSValueMakeNumber(ctx, 0);
		return JSObjectMakeArray(ctx, 2, res, NULL);
	}

	return JSValueMakeNull(ctx);
}

JSValueRef function_load_deps_cljs_files(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	// TODO: not implemented
	fprintf(stderr, "WARN: %s: stub\n", __func__);
	return JSObjectMakeArray(ctx, 0, NULL, NULL);
}

JSValueRef function_eval(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	JSValueRef val = NULL;

	if (argc == 2
		&& JSValueGetType(ctx, args[0]) == kJSTypeString
		&& JSValueGetType(ctx, args[1]) == kJSTypeString) {
		debug_print_value("eval", ctx, args[1]);

		JSStringRef sourceRef = JSValueToStringCopy(ctx, args[0], NULL);
		JSStringRef pathRef = JSValueToStringCopy(ctx, args[1], NULL);

		JSEvaluateScript(ctx, sourceRef, NULL, pathRef, 0, &val);

		JSStringRelease(pathRef);
		JSStringRelease(sourceRef);
	}

	return val != NULL ? val : JSValueMakeNull(ctx);
}

JSValueRef function_get_term_size(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	// TODO: not implemented
	fprintf(stderr, "WARN: %s: stub\n", __func__);
	return JSValueMakeNull(ctx);
}

JSValueRef function_print_fn(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	if (argc == 1 && JSValueIsString(ctx, args[0])) {
		JSStringRef val_str = JSValueToStringCopy(ctx, args[0], NULL);
		char buf[1000];
		JSStringGetUTF8CString(val_str, buf, 1000);

		fprintf(stdout, "%s", buf);
		fflush(stdout);
	}

	return JSValueMakeNull(ctx);
}

JSValueRef function_print_err_fn(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	if (argc == 1 && JSValueIsString(ctx, args[0])) {
		JSStringRef val_str = JSValueToStringCopy(ctx, args[0], NULL);
		char buf[1000];
		JSStringGetUTF8CString(val_str, buf, 1000);

		fprintf(stderr, "%s", buf);
		fflush(stderr);
	}

	return JSValueMakeNull(ctx);
}

JSValueRef function_import_script(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject,
		size_t argc, const JSValueRef args[], JSValueRef* exception) {
	if (argc == 1 && JSValueGetType(ctx, args[0]) == kJSTypeString) {
		JSStringRef path_str_ref = JSValueToStringCopy(ctx, args[0], NULL);
		char path[100];
		path[0] = '\0';
		JSStringGetUTF8CString(path_str_ref, path, 100);
		JSStringRelease(path_str_ref);

		char full_path[150];
		snprintf(full_path, 150, "%s/%s", "out", path);
		char *buf = get_contents(full_path);
		if (buf == NULL) {
			goto err;
		}

		evaluate_script(ctx, buf, full_path);
		free(buf);
	}

	return JSValueMakeUndefined(ctx);

err:
	// TODO: Fill exception with error from errno
	return JSValueMakeUndefined(ctx);
}

void register_global_function(JSContextRef ctx, char *name, JSObjectCallAsFunctionCallback handler) {
	JSObjectRef global_obj = JSContextGetGlobalObject(ctx);

	JSStringRef fn_name = JSStringCreateWithUTF8CString(name);
	JSObjectRef fn_obj = JSObjectMakeFunctionWithCallback(ctx, fn_name, handler);

	JSObjectSetProperty(ctx, global_obj, fn_name, fn_obj, kJSPropertyAttributeNone, NULL);
}

int main(int argc, char **argv) {
	JSGlobalContextRef ctx = JSGlobalContextCreate(NULL);

	JSStringRef nameRef = JSStringCreateWithUTF8CString("jsc-test");
	JSGlobalContextSetName(ctx, nameRef);

	JSObjectRef global_obj = JSContextGetGlobalObject(ctx);

	evaluate_script(ctx, "var global = this;", "<init>");

	register_global_function(ctx, "IMPORT_SCRIPT", function_import_script);
	bootstrap(ctx, "out/main.js", "out/goog/base.js");

	register_global_function(ctx, "CONSOLE_LOG", function_console_log);
	register_global_function(ctx, "CONSOLE_ERROR", function_console_error);

	evaluate_script(ctx, "var console = {};"\
			"console.log = CONSOLE_LOG;"\
			"console.error = CONSOLE_ERROR;", "<init>");

	// require app namespaces
	evaluate_script(ctx, "goog.require('planck.repl');", "<init>");

	// without this things won't work
	evaluate_script(ctx, "var window = global;", "<init>");

	register_global_function(ctx, "PLANCK_READ_FILE", function_read_file);
	register_global_function(ctx, "PLANCK_LOAD", function_load);
	register_global_function(ctx, "PLANCK_LOAD_DEPS_CLJS_FILES", function_load_deps_cljs_files);

	register_global_function(ctx, "PLANCK_EVAL", function_eval);

	register_global_function(ctx, "PLANCK_GET_TERM_SIZE", function_get_term_size);
	register_global_function(ctx, "PLANCK_PRINT_FN", function_print_fn);
	register_global_function(ctx, "PLANCK_PRINT_ERR_FN", function_print_err_fn);

	evaluate_script(ctx, "cljs.core.set_print_fn_BANG_.call(null,PLANCK_PRINT_FN);", "<init>");
	evaluate_script(ctx, "cljs.core.set_print_err_fn_BANG_.call(null,PLANCK_PRINT_ERR_FN);", "<init>");

	bool repl = true;

	{
		JSValueRef arguments[4];
		bool verbose = true, static_fns = true;
		arguments[0] = JSValueMakeBoolean(ctx, repl);
		arguments[1] = JSValueMakeBoolean(ctx, verbose);
		JSStringRef cache_path_str = JSStringCreateWithUTF8CString(".planck_cache");
		arguments[2] = JSValueMakeString(ctx, cache_path_str);
		arguments[3] = JSValueMakeBoolean(ctx, static_fns);
		JSValueRef ex = NULL;
		JSObjectCallAsFunction(ctx, get_function(ctx, "planck.repl", "init"), JSContextGetGlobalObject(ctx), 4, arguments, &ex);
		debug_print_value
	("planck.repl/init", ctx, ex);
	}

	if (repl) {
		evaluate_source(ctx, "text", "(require '[planck.repl :refer-macros [apropos dir find-doc doc source pst]])", true, "cljs.user");
	}

	evaluate_script(ctx, "goog.provide('cljs.user');", "<init>");
	evaluate_script(ctx, "goog.require('cljs.core');", "<init>");

	evaluate_script(ctx, "cljs.core._STAR_assert_STAR_ = true;", "<init>");

	//evaluate_source(ctx, "text", "(empty? \"\")", true, "cljs.user");

	printf("---\nrequire macros\n---\n");
	evaluate_source(ctx, "text", "(require-macros 'planck.repl 'planck.core 'planck.shell 'planck.from.io.aviso.ansi 'clojure.template 'cljs.spec 'cljs.spec.impl.gen 'cljs.test)", true, "cljs.user");

	if (repl) {
		bool javascript = false;
		char *prompt = javascript ? " > " : " => ";

		char *line;
		while ((line = linenoise(prompt)) != NULL) {
			JSValueRef res = NULL;
			if (javascript) {
				res = evaluate_script(ctx, line, "<stdin>");
			} else {
				res = evaluate_source(ctx, "text", line, true, "cljs.user");
			}
			free(line);

			char res_buf[1000];
			res_buf[0] = '\0';
			JSStringRef res_str = to_string(ctx, res);
			JSStringGetUTF8CString(res_str, res_buf, 1000);
			printf("%s\n", res_buf);
		}
	}
}

JSStringRef to_string(JSContextRef ctx, JSValueRef val) {
	if (JSValueIsUndefined(ctx, val)) {
		return JSStringCreateWithUTF8CString("undefined");
	} else if (JSValueIsNull(ctx, val)) {
		return JSStringCreateWithUTF8CString("null");
	} else {
		JSStringRef to_string_name = JSStringCreateWithUTF8CString("toString");
		JSObjectRef obj = JSValueToObject(ctx, val, NULL);
		JSValueRef to_string = JSObjectGetProperty(ctx, obj, to_string_name, NULL);
		JSObjectRef to_string_obj = JSValueToObject(ctx, to_string, NULL);
		JSValueRef obj_val = JSObjectCallAsFunction(ctx, to_string_obj, obj, 0, NULL, NULL);

		return JSValueToStringCopy(ctx, obj_val, NULL);
	}
}

JSValueRef evaluate_script(JSContextRef ctx, char *script, char *source) {
	JSStringRef script_ref = JSStringCreateWithUTF8CString(script);
	JSStringRef source_ref = NULL;
	if (source != NULL) {
		source_ref = JSStringCreateWithUTF8CString(source);
	}

	JSValueRef ex = NULL;
	JSValueRef val = JSEvaluateScript(ctx, script_ref, NULL, source_ref, 0, &ex);
	JSStringRelease(script_ref);
	if (source != NULL) {
		JSStringRelease(source_ref);
	}

	debug_print_value
("evaluate_script", ctx, ex);

	return val;
}

JSValueRef get_value_on_object(JSContextRef ctx, JSObjectRef obj, char *name) {
	JSStringRef name_str = JSStringCreateWithUTF8CString(name);
	JSValueRef val = JSObjectGetProperty(ctx, obj, name_str, NULL);
	JSStringRelease(name_str);
	return val;
}

JSValueRef get_value(JSContextRef ctx, char *namespace, char *name) {
	JSValueRef ns_val = NULL;

	// printf("get_value: '%s'\n", namespace);
	int len = strlen(namespace) + 1;
	char *ns_tmp = malloc(len * sizeof(char));
	char **ns_tmp_start = &ns_tmp;
	strncpy(ns_tmp, namespace, len);
	char *ns_part = strtok(ns_tmp, ".");
	ns_tmp = NULL;
	while (ns_part != NULL) {
		char *munged_ns_part = munge(ns_part);
		if (ns_val) {
			ns_val = get_value_on_object(ctx, JSValueToObject(ctx, ns_val, NULL), munged_ns_part);
		} else {
			ns_val = get_value_on_object(ctx, JSContextGetGlobalObject(ctx), munged_ns_part);
		}
		free(munged_ns_part); // TODO: Use a fixed buffer for this?  (Which would restrict namespace part length...)

		ns_part = strtok(NULL, ".");
	}
	//free(ns_tmp);

	return get_value_on_object(ctx, JSValueToObject(ctx, ns_val, NULL), name);
}

JSObjectRef get_function(JSContextRef ctx, char *namespace, char *name) {
	JSValueRef val = get_value(ctx, namespace, name);
	assert(!JSValueIsUndefined(ctx, val));
	return JSValueToObject(ctx, val, NULL);
}

JSValueRef evaluate_source(JSContextRef ctx, char *type, char *source, bool expression, char *set_ns) {
	JSValueRef args[7];
	int num_args = 7;

	{
		JSValueRef source_args[2];
		JSStringRef type_str = JSStringCreateWithUTF8CString(type);
		source_args[0] = JSValueMakeString(ctx, type_str);
		JSStringRef source_str = JSStringCreateWithUTF8CString(source);
		source_args[1] = JSValueMakeString(ctx, source_str);
		args[0] = JSObjectMakeArray(ctx, 2, source_args, NULL);
	}

	args[1] = JSValueMakeBoolean(ctx, expression);
	args[2] = JSValueMakeBoolean(ctx, false);
	args[3] = JSValueMakeBoolean(ctx, false);
	JSStringRef set_ns_str = JSStringCreateWithUTF8CString(set_ns);
	args[4] = JSValueMakeString(ctx, set_ns_str);
	JSStringRef theme_str = JSStringCreateWithUTF8CString("dumb");
	args[5] = JSValueMakeString(ctx, theme_str);
	args[6] = JSValueMakeNumber(ctx, 0);

	JSObjectRef execute_fn = get_function(ctx, "planck.repl", "execute");
	JSObjectRef global_obj = JSContextGetGlobalObject(ctx);
	JSValueRef ex = NULL;
	JSValueRef val = JSObjectCallAsFunction(ctx, execute_fn, global_obj, num_args, args, &ex);

	debug_print_value
("planck.repl/execute", ctx, ex);

	return ex != NULL ? ex : val;
}

char *munge(char *s) {
	int len = strlen(s);
	int new_len = 0;
	for (int i = 0; i < len; i++) {
		switch (s[i]) {
		case '!':
			new_len += 6; // _BANG_
			break;
		case '?':
			new_len += 7; // _QMARK_
			break;
		default:
			new_len += 1;
		}
	}

	char *ms = malloc((new_len+1) * sizeof(char));
	int j = 0;
	for (int i = 0; i < len; i++) {
		switch (s[i]) {
		case '-':
			ms[j++] = '_';
			break;
		case '!':
			ms[j++] = '_';
			ms[j++] = 'B';
			ms[j++] = 'A';
			ms[j++] = 'N';
			ms[j++] = 'G';
			ms[j++] = '_';
			break;
		case '?':
			ms[j++] = '_';
			ms[j++] = 'Q';
			ms[j++] = 'M';
			ms[j++] = 'A';
			ms[j++] = 'R';
			ms[j++] = 'K';
			ms[j++] = '_';
			break;

		default:
			ms[j++] = s[i];
		}
	}
	ms[new_len] = '\0';

	return ms;
}

void bootstrap(JSContextRef ctx, char *deps_file_path, char *goog_base_path) {
	char source[] = "<bootstrap>";

	// Setup CLOSURE_IMPORT_SCRIPT
	evaluate_script(ctx, "CLOSURE_IMPORT_SCRIPT = function(src) { IMPORT_SCRIPT('goog/' + src); return true; }", source);

	// Load goog base
	char *base_script_str = get_contents(goog_base_path);
	if (base_script_str == NULL) {
		fprintf(stderr, "The goog base JavaScript text could not be loaded");
		exit(1);
	}
	evaluate_script(ctx, base_script_str, "<bootstrap:base>");
	free(base_script_str);

	// Load the deps file
	char *deps_script_str = get_contents(deps_file_path);
	if (deps_script_str == NULL) {
		fprintf(stderr, "The goog base JavaScript text could not be loaded");
		exit(1);
	}
	evaluate_script(ctx, deps_script_str, "<bootstrap:deps>");
	free(deps_script_str);

	evaluate_script(ctx, "goog.isProvided_ = function(x) { return false; };", source);

	evaluate_script(ctx, "goog.require = function (name) { return CLOSURE_IMPORT_SCRIPT(goog.dependencies_.nameToPath[name]); };", source);

	evaluate_script(ctx, "goog.require('cljs.core');", source);

	// redef goog.require to track loaded libs
	evaluate_script(ctx, "cljs.core._STAR_loaded_libs_STAR_ = cljs.core.into.call(null, cljs.core.PersistentHashSet.EMPTY, [\"cljs.core\"]);\n"
			"goog.require = function (name, reload) {\n"
			"    if(!cljs.core.contains_QMARK_(cljs.core._STAR_loaded_libs_STAR_, name) || reload) {\n"
			"        var AMBLY_TMP = cljs.core.PersistentHashSet.EMPTY;\n"
			"        if (cljs.core._STAR_loaded_libs_STAR_) {\n"
			"            AMBLY_TMP = cljs.core._STAR_loaded_libs_STAR_;\n"
			"        }\n"
			"        cljs.core._STAR_loaded_libs_STAR_ = cljs.core.into.call(null, AMBLY_TMP, [name]);\n"
			"        CLOSURE_IMPORT_SCRIPT(goog.dependencies_.nameToPath[name]);\n"
			"    }\n"
			"};", source);
}

char *get_contents(char *path) {
/*#ifdef DEBUG
	printf("get_contents(\"%s\")\n", path);
#endif*/

	char *err_prefix;

	FILE *f = fopen(path, "r");
	if (f == NULL) {
		err_prefix = "fopen";
		goto err;
	}

	struct stat f_stat;
	if (fstat(fileno(f), &f_stat) < 0) {
		err_prefix = "fstat";
		goto err;
	}

	char *buf = malloc(f_stat.st_size + 1);
	memset(buf, 0, f_stat.st_size);
	fread(buf, f_stat.st_size, 1, f);
	buf[f_stat.st_size] = '\0';
	if (ferror(f)) {
		err_prefix = "fread";
		free(buf);
		goto err;
	}

	if (fclose(f) < 0) {
		err_prefix = "fclose";
		goto err;
	}

	return buf;

err:
	printf("get_contents(\"%s\"): %s: %s\n", path, err_prefix, strerror(errno));
	return NULL;
}