//=========== (C) Copyright 1999 Valve, L.L.C. All rights reserved. ===========
//
// The copyright to the contents herein is the property of Valve, L.L.C.
// The contents may be used and/or copied only with the written permission of
// Valve, L.L.C., or in accordance with the terms and conditions stipulated in
// the agreement/contract under which the contents have been supplied.
//
// Purpose: Functionality for the observer chase camera
//
// $Workfile:     $
// $Date:         $
//
//-----------------------------------------------------------------------------
// $Log: $
//
// $NoKeywords: $
//=============================================================================
#include "extdll.h"
#include "util.h"
#include "cbase.h"
#include "player.h"
#include "weapons.h"
#include "pm_shared.h"
#include "UserMessages.h"

// Find the next client in the game for this player to spectate
void CBasePlayer::Observer_FindNextPlayer(bool bReverse)
{
	// MOD AUTHORS: Modify the logic of this function if you want to restrict the observer to watching
	//				only a subset of the players. e.g. Make it check the target's team.

	int iStart;
	if (m_hObserverTarget)
		iStart = ENTINDEX(m_hObserverTarget->edict());
	else
		iStart = ENTINDEX(edict());
	int iCurrent = iStart;
	m_hObserverTarget = NULL;
	int iDir = bReverse ? -1 : 1;

	do
	{
		iCurrent += iDir;

		// Loop through the clients
		if (iCurrent > gpGlobals->maxClients)
			iCurrent = 1;
		if (iCurrent < 1)
			iCurrent = gpGlobals->maxClients;

		CBaseEntity* pEnt = UTIL_PlayerByIndex(iCurrent);
		if (!pEnt)
			continue;
		if (pEnt == this)
			continue;
		// Don't spec observers or players who haven't picked a class yet
		if (((CBasePlayer*)pEnt)->IsObserver() || (pEnt->pev->effects & EF_NODRAW) != 0)
			continue;

		// MOD AUTHORS: Add checks on target here.

		m_hObserverTarget = pEnt;
		break;

	} while (iCurrent != iStart);

	// Did we find a target?
	if (m_hObserverTarget)
	{
		// Move to the target
		UTIL_SetOrigin(pev, m_hObserverTarget->pev->origin);

		// ALERT( at_console, "Now Tracking %s\n", STRING( m_hObserverTarget->pev->netname ) );

		// Store the target in pev so the physics DLL can get to it
		if (pev->iuser1 != OBS_ROAMING)
			pev->iuser2 = ENTINDEX(m_hObserverTarget->edict());
	}
}

// Handle buttons in observer mode
void CBasePlayer::Observer_HandleButtons()
{
	// Slow down mouse clicks
	if (m_flNextObserverInput > gpGlobals->time)
		return;

	// Jump changes from modes: Chase to Roaming
	if ((m_afButtonPressed & IN_JUMP) != 0)
	{
		if (pev->iuser1 == OBS_CHASE_LOCKED)
			Observer_SetMode(OBS_CHASE_FREE);

		else if (pev->iuser1 == OBS_CHASE_FREE)
			Observer_SetMode(OBS_IN_EYE);

		else if (pev->iuser1 == OBS_IN_EYE)
			Observer_SetMode(OBS_ROAMING);

		else if (pev->iuser1 == OBS_ROAMING)
			Observer_SetMode(OBS_MAP_FREE);

		else if (pev->iuser1 == OBS_MAP_FREE)
			Observer_SetMode(OBS_MAP_CHASE);

		else
			Observer_SetMode(OBS_CHASE_FREE); // don't use OBS_CHASE_LOCKED anymore

		m_flNextObserverInput = gpGlobals->time + 0.2;
	}

	// Attack moves to the next player
	if ((m_afButtonPressed & IN_ATTACK) != 0) //&& pev->iuser1 != OBS_ROAMING )
	{
		Observer_FindNextPlayer(false);

		m_flNextObserverInput = gpGlobals->time + 0.2;
	}

	// Attack2 moves to the prev player
	if ((m_afButtonPressed & IN_ATTACK2) != 0) // && pev->iuser1 != OBS_ROAMING )
	{
		Observer_FindNextPlayer(true);

		m_flNextObserverInput = gpGlobals->time + 0.2;
	}
}

void CBasePlayer::Observer_CheckTarget()
{
	if (pev->iuser1 == OBS_ROAMING)
		return;

	// try to find a traget if we have no current one
	if (m_hObserverTarget == NULL)
	{
		Observer_FindNextPlayer(false);

		if (m_hObserverTarget == NULL)
		{
			// no target found at all

			int lastMode = pev->iuser1;

			Observer_SetMode(OBS_ROAMING);

			m_iObserverLastMode = lastMode; // don't overwrite users lastmode

			return; // we still have np target return
		}
	}

	CBasePlayer* target = (CBasePlayer*)(UTIL_PlayerByIndex(ENTINDEX(m_hObserverTarget->edict())));

	if (!target)
	{
		Observer_FindNextPlayer(false);
		return;
	}

	// check taget
	if (target->pev->deadflag == DEAD_DEAD)
	{
		if ((target->m_fDeadTime + 2.0f) < gpGlobals->time)
		{
			// 3 secs after death change target
			Observer_FindNextPlayer(false);
			return;
		}
	}
}

void CBasePlayer::Observer_CheckProperties()
{
	// try to find a traget if we have no current one
	if (pev->iuser1 == OBS_IN_EYE && m_hObserverTarget != NULL)
	{
		CBasePlayer* target = (CBasePlayer*)(UTIL_PlayerByIndex(ENTINDEX(m_hObserverTarget->edict())));

		if (!target)
			return;

		int weapon = (target->m_pActiveItem != NULL) ? target->m_pActiveItem->m_iId : 0;
		// use fov of tracked client
		if (m_iFOV != target->m_iFOV || m_iObserverWeapon != weapon)
		{
			m_iFOV = target->m_iFOV;
			m_iClientFOV = m_iFOV;
			// write fov before wepon data, so zoomed crosshair is set correctly
			MESSAGE_BEGIN(MSG_ONE, gmsgSetFOV, NULL, pev);
			WRITE_BYTE(m_iFOV);
			MESSAGE_END();


			m_iObserverWeapon = weapon;
			//send weapon update
			MESSAGE_BEGIN(MSG_ONE, gmsgCurWeapon, NULL, pev);
			WRITE_BYTE(1); // 1 = current weapon, not on target
			WRITE_BYTE(m_iObserverWeapon);
			WRITE_BYTE(0); // clip
			MESSAGE_END();
		}
	}
	else
	{
		m_iFOV = 90;

		if (m_iObserverWeapon != 0)
		{
			m_iObserverWeapon = 0;

			MESSAGE_BEGIN(MSG_ONE, gmsgCurWeapon, NULL, pev);
			WRITE_BYTE(1); // 1 = current weapon
			WRITE_BYTE(m_iObserverWeapon);
			WRITE_BYTE(0); // clip
			MESSAGE_END();
		}
	}
}

// Attempt to change the observer mode
void CBasePlayer::Observer_SetMode(int iMode)
{

	// Just abort if we're changing to the mode we're already in
	if (iMode == pev->iuser1)
		return;

	// is valid mode ?
	if (iMode < OBS_CHASE_LOCKED || iMode > OBS_MAP_CHASE)
		iMode = OBS_IN_EYE; // now it is
	// verify observer target again
	if (m_hObserverTarget != NULL)
	{
		CBaseEntity* pEnt = m_hObserverTarget;

		if ((pEnt == this) || (pEnt == NULL))
			m_hObserverTarget = NULL;
		else if (((CBasePlayer*)pEnt)->IsObserver() || (pEnt->pev->effects & EF_NODRAW) != 0)
			m_hObserverTarget = NULL;
	}

	// set spectator mode
	pev->iuser1 = iMode;

	// if we are not roaming, we need a valid target to track
	if ((iMode != OBS_ROAMING) && (m_hObserverTarget == NULL))
	{
		Observer_FindNextPlayer(false);

		// if we didn't find a valid target switch to roaming
		if (m_hObserverTarget == NULL)
		{
			ClientPrint(pev, HUD_PRINTCENTER, "#Spec_NoTarget");
			pev->iuser1 = OBS_ROAMING;
		}
	}

	// set target if not roaming
	if (pev->iuser1 == OBS_ROAMING)
	{
		pev->iuser2 = 0;
	}
	else
		pev->iuser2 = ENTINDEX(m_hObserverTarget->edict());

	pev->iuser3 = 0; // clear second target from death cam

	// print spepctaor mode on client screen

	char modemsg[16];
	sprintf(modemsg, "#Spec_Mode%i", pev->iuser1);
	ClientPrint(pev, HUD_PRINTCENTER, modemsg);

	m_iObserverLastMode = iMode;
}