//=========== (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"

extern int gmsgCurWeapon;
extern int gmsgSetFOV;
extern int gmsgTeamInfo;
         
extern int g_teamplay;

// 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 = 0;
	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 ) )
			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( this, 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 )
	{
		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 )//&& pev->iuser1 != OBS_ROAMING )
	{
		Observer_FindNextPlayer( false );

		m_flNextObserverInput = gpGlobals->time + 0.2;
	}

	// Attack2 moves to the prev player
	if ( m_afButtonPressed & IN_ATTACK2)// && 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 == 0 )
	{
		Observer_FindNextPlayer( false );

		if( m_hObserverTarget == 0 )
		{
			// 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 != 0 )
	{
		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 != 0 )
	{
		CBaseEntity *pEnt = m_hObserverTarget;

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

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

	// if we are not roaming, we need a valid target to track
	if( ( iMode != OBS_ROAMING ) && ( m_hObserverTarget == 0 ) )
	{
		Observer_FindNextPlayer( false );

		// if we didn't find a valid target switch to roaming
		if( m_hObserverTarget == 0 )
		{
			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;
}

void CBasePlayer::StopObserver()
{
	// Turn off spectator
	pev->iuser1 = pev->iuser2 = 0;
	m_iHideHUD = 0;

	GetClassPtr( (CBasePlayer *)pev )->Spawn();
	pev->nextthink = -1;

	// Update Team Status
	MESSAGE_BEGIN( MSG_ALL, gmsgTeamInfo );
		WRITE_BYTE( ENTINDEX( edict() ) ); // index number of primary entity
	if( g_teamplay )
		WRITE_STRING( TeamID() );
	else
		WRITE_STRING( "Players" );
	MESSAGE_END();
}