/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2010, Tomasz Sowa
 * All rights reserved.
 * 
 */
 

#include <map>
#include "core/log.h"
#include "core/request.h"
#include "core/config.h"
#include "core/db.h"

#include "stats.h"
#include "templates.h"
#include "data.h"

extern "C" void Init(PluginInfo &);
const char plugin_name[] = "stats";


namespace Stats
{

// when the statistics start
time_t stats_start;


// statistics for all pages
StatsGlobal stat_global;

// statistics for one item
// <item_id, Stats>
std::map<long, Stats> stats_tab;


// when to save the config (how many requests should have gone)
// (for safety: power failure etc)
// default: 1000
// you can set: stats_req_save_freq in the config file to overwrite it
// 0 - turn it off
int req_save_freq = 1000;
int req_current = 0; // helper




long ItemId()
{
long item_id;

	if( request.is_item )
		item_id = request.item.id;
	else
		item_id = request.dir_table.back()->id;

return item_id;
}


void CheckSaving()
{
	req_current += 1;

	if( req_save_freq != 0 && req_current >= req_save_freq )
	{
		SaveStats();
		req_current = 0;
	}
}



bool BrowserHas(const char * name)
{
	const char * is = strstr(request.env_http_user_agent, name);
	return is != 0;
}


bool IsGoogle()
{
	return BrowserHas("Googlebot") && BrowserHas("www.google.com");
}


bool IsYahoo()
{
	return BrowserHas("Yahoo!") && BrowserHas("yahoo.com");
}


void UpdateStats(Stats & item_stats)
{
	stat_global.all += 1;
	item_stats.all  += 1;

	if( IsGoogle() )
	{
		stat_global.google += 1;
		item_stats.google  += 1;
	}

	if( IsYahoo() )
	{
		stat_global.yahoo += 1;
		item_stats.yahoo  += 1;
	}
}


void ContentMake(PluginInfo & info)
{
StatsData * d = 0;

	long id = ItemId();

	if( info.plugin_data_base )
		d = reinterpret_cast<StatsData*>(info.plugin_data_base);

	// this simply prevents F5 (refresh) from a webbrowser
	if( d && d->last_visited != -1 && d->last_visited == id )
		return;

	if( d )	
		d->last_visited = id;

	UpdateStats(stats_tab[id]);

	if( d && !d->calculated )
	{
		stat_global.unique += 1;
		d->calculated = true;
	}

	CheckSaving();
}



void SessionCreated(PluginInfo & info)
{
	StatsData * d = new StatsData();
	request.session->plugin_data.Assign(d);

	log << log3 << "created stats plugin data"
		<< ", plugin id: " << info.plugin_id
		<< ", pointer: "   << d << logend;
}



void RemoveSession(PluginInfo & info)
{
	log << log1 << "deleting stats plugin data"
		<< ", plugin id: " << info.plugin_id
		<< ", pointer: " << info.plugin_data_base << logend;

	delete info.plugin_data_base;
}



void ReadConfig()
{
	stats_file = config.Text("stats_file");
	req_save_freq = config.Int("stats_req_save_freq", req_save_freq);

	if( stats_file.empty() )
		log << log1 << "you should set stats_file in your config to keep statistics between restarting winix" << logend;
	else
		log << log2 << "stats_file: " << stats_file << logend;

	stats_start = time(0); // it will be overwritten if the config file exists
	ReadStats();
}


void Close()
{
	SaveStats();
}


void RemoveItem(long id)
{
	std::map<long, Stats>::iterator i = stats_tab.find(id);

	if( i == stats_tab.end() )
		return;

	stats_tab.erase(i);
	log << log3 << "Stats: removed stats for item.id: " << id << logend;
}



void RemoveFile(PluginInfo & info)
{
	RemoveItem(info.l1);
}


void RemoveDir(PluginInfo & info)
{
Db::ItemQuery query;
std::vector<long> items;
size_t i;

	query.SetAll(false, false);
	query.WhereParentId(info.l1);
	db.GetItems(items, query);

	// removing childs
	for(i=0 ; i<items.size() ; ++i)
		RemoveItem(items[i]);

	// removing the directory
	RemoveItem(info.l1);
}


} // namespace



void Init(PluginInfo & info)
{
using namespace Stats;

	plugin.Assign(WINIX_TEMPLATES_CREATEFUNCTIONS,	CreateFunctions);
	plugin.Assign(WINIX_CONTENT_MAKE,				ContentMake);
	plugin.Assign(WINIX_SESSION_CREATED,			SessionCreated);
	plugin.Assign(WINIX_SESSION_REMOVE,				RemoveSession);
	plugin.Assign(WINIX_PLUGIN_INIT,				ReadConfig);
	plugin.Assign(WINIX_CLOSE,						Close);
	plugin.Assign(WINIX_FILE_REMOVED,				RemoveFile);
	plugin.Assign(WINIX_DIR_PREPARE_TO_REMOVE,		RemoveDir);

	info.p1 = (void*)plugin_name;
}