#include "ssb.export.h"

#include "ssb.h"

#include <stdlib.h>
#include <string.h>
#include <sqlite3.h>
#include <uv.h>

static void _write_file(const char* path, void* blob, size_t size)
{
	FILE* file = fopen(path, "wb");
	if (file) {
		fwrite(blob, 1, size, file);
		fclose(file);
	} else {
		printf("Failed to open %s for write: %s.\n", path, strerror(errno));
	}
}

void tf_ssb_export(tf_ssb_t* ssb, const char* key)
{
	char user[256] = { 0 };
	char path[256] = { 0 };
	if (sscanf(key, "/~%255[^/]/%255s", user, path) != 2) {
		printf("Unable to export %s.\n", key);
		return;
	}

	char app_blob_id[64] = { 0 };

	sqlite3_stmt* statement;
	if (sqlite3_prepare(tf_ssb_get_db(ssb), "SELECT value FROM properties WHERE id = $1 AND key = 'path:' || $2", -1, &statement, NULL) == SQLITE_OK) {
		if (sqlite3_bind_text(statement, 1, user, -1, NULL) == SQLITE_OK &&
			sqlite3_bind_text(statement, 2, path, -1, NULL) == SQLITE_OK &&
			sqlite3_step(statement) == SQLITE_ROW) {
			int len = sqlite3_column_bytes(statement, 0);
			if (len >= (int)sizeof(app_blob_id)) {
				len = sizeof(app_blob_id) - 1;
			}
			memcpy(app_blob_id, sqlite3_column_text(statement, 0), len);
			app_blob_id[len] = '\0';
		}
		sqlite3_finalize(statement);
	}

	if (!*app_blob_id) {
		printf("Did not find app blob ID for %s.\n", key);
		return;
	}

	uint8_t* blob = NULL;
	size_t size = 0;
	if (!tf_ssb_blob_get(ssb, app_blob_id, &blob, &size)) {
		printf("Did not find blob for %s: %s.\n", key, app_blob_id);
		return;
	}
	char file_path[1024];
	snprintf(file_path, sizeof(file_path), "apps/%s/%s.json", user, path);
	_write_file(file_path, blob, size);
	JSContext* context = tf_ssb_get_context(ssb);
	JSValue app = JS_ParseJSON(context, (const char*)blob, size, NULL);
	free(blob);

	JSValue files = JS_GetPropertyStr(context, app, "files");
	JSPropertyEnum* ptab = NULL;
	uint32_t plen = 0;
	if (JS_GetOwnPropertyNames(context, &ptab, &plen, files, JS_GPN_STRING_MASK) == 0) {
		for (uint32_t i = 0; i < plen; ++i) {
			JSPropertyDescriptor desc;
			if (JS_GetOwnProperty(context, &desc, files, ptab[i].atom) == 1) {
				JSValue key = JS_AtomToString(context, ptab[i].atom);
				const char* file_name = JS_ToCString(context, key);
				const char* blob_id = JS_ToCString(context, desc.value);

				uint8_t* file_blob = NULL;
				size_t file_size = 0;
				if (tf_ssb_blob_get(ssb, blob_id, &file_blob, &file_size)) {
					snprintf(file_path, sizeof(file_path), "apps/%s/%s/%s", user, path, file_name);
					_write_file(file_path, file_blob, file_size);
					free(file_blob);
				}

				JS_FreeCString(context, file_name);
				JS_FreeValue(context, key);
				JS_FreeCString(context, blob_id);
				JS_FreeValue(context, desc.value);
			}
		}
	}

	for (uint32_t i = 0; i < plen; ++i) {
		JS_FreeAtom(context, ptab[i].atom);
	}
	js_free(context, ptab);

	JS_FreeValue(context, files);
	JS_FreeValue(context, app);
}