' Missile Lock
'
' Copyright (C) 2006  Ian Cowburn (ianc@noddybox.co.uk)
'
' This program is free software; you can redistribute it and/or modify
' it under the terms of the GNU General Public License as published by
' the Free Software Foundation; either version 2 of the License, or
' (at your option) any later version.
'
' This program is distributed in the hope that it will be useful,
' but WITHOUT ANY WARRANTY; without even the implied warranty of
' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
' GNU General Public License for more details.
'
' You should have received a copy of the GNU General Public License
' along with this program; if not, write to the Free Software
' Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
'
' -------------------------------------------------------------------------
'
' $Id$
'
Strict
Import noddybox.algorithm
Import "global.bmx"
Import "particle.bmx"
Import "sound.bmx"

Const SHIP_TURN:Double=2
Const SHIP_MAX_SPEED:Double=2.5
Const SHIP_SPEED:Double=0.05
Const SHIP_MIN_SPEED:Double=1

Const MIN_TURN:Double=1
Const MAX_TURN:Double=5.0
Const MIN_SPEED:Double=1
Const MAX_SPEED:Double=2.2

Type GameState
	Global score:Int=0
	Global x:Double=0
	Global y:Double=0
	Global ang:Double=0
	Global speed:Double=SHIP_MIN_SPEED
	Global lives:Int=3
	Global level:Int=1
	Global max_missile:Int=1
	Global missile_turn:Double=0.5
	Global missile_speed:Double=1
	Global shield:Int=5*HERTZ
	Global game_over:Int=False
	Global hit:Int=False
	Global pause:Int=False
	Global bonus_timer:Int
	Global gonads:Int
	
	Function Reset()
		score=0
		x=400
		y=300
		ang=0
		speed=SHIP_MIN_SPEED
		lives=3
		SetLevel(1)
		ShieldShip()
		game_over=False
		pause=False
	End Function
	
	Function ShieldShip()
		shield=3*HERTZ
	End Function
	
	Function ShieldDown()
		lives:-1
		hit=True
		gonads=False
		ShieldShip()
		If lives<0
			game_over=True
			SFX.ShipExplode()
		Else
			SFX.ShipHit()
		EndIf
	End Function
	
	Function AddScore(s:Int)
		score:+s
		If score>GameConfig.hiscore
			GameConfig.hiscore=score
		EndIf
	End Function
	
	Function LevelUp()
		SetLevel(level+1)
	End Function
	
	Function SetLevel(l:Int)
		level=l
		hit=False
		gonads=True
		max_missile=Min(50,l*2)
		missile_turn=Min(MAX_TURN,MIN_TURN+Double(level)/4)
		missile_speed=Min(MAX_SPEED,MIN_SPEED+Double(level)/4)
		bonus_timer=l*500
	End Function
	
	Function Control()
		If KeyDown(GameConfig.kleft)
			ang:-SHIP_TURN
		End If
		
		If KeyDown(GameConfig.kright)
			ang:+SHIP_TURN
		End If
		
		If KeyDown(GameConfig.kthrust) And speed<=SHIP_MAX_SPEED
			speed=Min(SHIP_MAX_SPEED,speed+SHIP_SPEED)
			gonads=False
		Else
			speed=Max(SHIP_MIN_SPEED,speed-SHIP_SPEED/2)
		End If
		
		If KeyHit(GameConfig.kpause)
			pause=True
		End If
		
		If KeyHit(KEY_ESCAPE)
			game_over=True
		EndIf
	End Function
	
	Function Move()
		x=(x+Sin(ang)*speed) Mod 800
		y=(y-Cos(ang)*speed) Mod 600
		If x<0 Then x:+800
		If y<0 Then y:+600
		Trail.Add()
		If shield Then shield:-1
		If bonus_timer Then bonus_timer:-1
	End Function
	
	Function Display()
		Local s:String=""
		
		For Local f:Int=1 To lives
			s:+"~~"
		Next
		
		GFX.font.Draw("SCORE",0,0)
		GFX.font.Draw(Number.Format(score),0,16,255,255,0)

		GFX.font.Centre("SHIELDS",0)
		GFX.font.Centre(s,16)

		GFX.font.Draw("LEVEL " + level,0,584)
		GFX.font.Draw("BONUS " + bonus_timer,350,584)
		GFX.font.Draw("MISSILES " + MissileSet.Count(),623,584)

		GFX.font.DrawRight("HISCORE",799,0)
		GFX.font.DrawRight(Number.Format(GameConfig.hiscore),799,16,255,255,0)
	End Function	
End Type


Type BackdropStar
	Field x:Double
	Field y:Double
	Field r:Int
	Field g:Int
	Field b:Int
	Field twinkle:Int
	Field frame:Int
	
	Method New()
		x=Rand(0,800)
		y=Rand(0,598)
		r=Rand(128,255)
		g=Rand(128,255)
		b=Rand(128,255)
	End Method
End Type


Type Backdrop
	Const NUM:Int=100
	Global s:BackdropStar[]
	Global frame:Int
	
	Function Init()
		s=New BackdropStar[NUM]
		
		For Local f:Int=0 Until NUM
			s[f]=New BackdropStar
			s[f].frame=f Mod 6
			s[f].twinkle=Rand(100)>70
		Next
		
		frame=0
	End Function
	
	Function Draw()
		frame=(frame+1) Mod 6
		For Local f:Int=0 Until NUM
			SetColor(s[f].r,s[f].g,s[f].b)
			If s[f].twinkle
				DrawImage(GFX.twinkle,s[f].x,s[f].y,s[f].frame)
				If Not frame
					s[f].frame=(s[f].frame+1) Mod 6
					s[f].x=(s[f].x+2) Mod 800
				EndIf
			Else
				DrawImage(GFX.star,s[f].x,s[f].y)
				If Not frame
					s[f].x=(s[f].x+1) Mod 800
				EndIf
			EndIf
		Next
	End Function
End Type

Type TrailPart
	Field x:Double
	Field y:Double
	Field ang:Double
	Field al:Double
	Field sc:Double
	
	Method New()
		x=GameState.x
		y=GameState.y
		ang=GameState.ang
		al=1
		sc=1
	End Method
End Type

Type Trail
	Global plist:TList
	
	Function Init()
		plist=CreateList()
	End Function
	
	Function Clear()
		plist.Clear()
	End Function
	
	Function Add()
		plist.AddLast(New TrailPart)
	End Function
	
	Function Draw()
		SetColor(255,255,255)
		Local l:TEasyLink=TEasyLink.Create(plist)
		
		While l.Value()
			Local t:TrailPart=TrailPart(l.Value())

			If t.al>0.1
				SetRotation(t.ang)
				SetScale(t.sc,t.sc)
				SetAlpha(t.al)
				DrawImage(GFX.flame,t.x,t.y)
				t.al:-0.05
				't.sc:+0.1
				l.MoveNext()
			Else
				l.Remove()
			EndIf
		Wend

		SetRotation(0)
		SetAlpha(1)
		SetScale(1,1)
	End Function
End Type

Type Missile
	Field x:Double
	Field y:Double
	Field ang:Double
	Field onscreen:Int
	Field turn:Double
	Field speed:Double
	Field accurate:Int
	Field smoke:Int
	
	Method New()
		Select Rand(1,4)
			Case 1
				x=Rand(20,780)
				y=Rand(-100,0)
				ang=180
			Case 2
				x=Rand(20,780)
				y=Rand(600,700)
				ang=0
			Case 3
				y=Rand(20,580)
				x=Rand(-100,0)
				ang=90
			Case 4
				y=Rand(20,580)
				x=Rand(800,900)
				ang=270
		End Select
		speed=Rnd(Max(MIN_SPEED,GameState.missile_speed-0.1),GameState.missile_speed)
		turn=Rnd(Max(MIN_TURN,GameState.missile_turn-0.1),GameState.missile_turn)
		onscreen=False
		If Rand(100)>50
			accurate=True
		EndIf
		smoke=0
	End Method
	
	Method Update(tx:Double,ty:Double)
		If onscreen
			Local a:Double
			
			If accurate
				a=ATan2(tx-x,y-ty)
			Else
				a=ATan2(GameState.x-x,y-GameState.y)
			EndIf
			
			If a<0 Then a:+360
			
			a:-ang
			
			If a<0
				If a>-180
					ang:-turn
				Else
					ang:+turn
				EndIf
			ElseIf a>0
				If a>180
					ang:-turn
				Else
					ang:+turn
				EndIf
			EndIf
			
			ang=ang Mod 360
			If ang<0 Then ang:+360
		EndIf
		
		SetRotation(ang)
		x:+Sin(ang)*speed
		y:-Cos(ang)*speed
		DrawImage(GFX.missile,x,y)
		CollideImage(GFX.missile,x,y,0,0,MISSILE_LAYER,Self)
		
		smoke:+1
		
		If smoke=10
			Particles.AddScaledImage(GFX.exhaust,x,y,0.1)
			smoke=0
		EndIf
		
		If onscreen
			x=x Mod 800
			y=y Mod 600
			If x<0 Then x:+800
			If y<0 Then y:+600
		Else
			onscreen=(x>=0 And x<800 And y>=0 And y<600)
		EndIf
	End Method
End Type

Type MissileSet
	Global plist:TList
	Global create:Int
	Global wait:Int

	Function Init()
		plist=CreateList()
		create=0
	End Function
	
	Function StartLevel()
		plist.Clear()
		create=GameState.max_missile
		wait=HERTZ
	End Function
	
	Function Count:Int()
		Return plist.Count()
	End Function
	
	Function Update()
		If wait=0
			If create
				plist.AddLast(New Missile)
				create:-1
				SFX.MissileLaunch()
			EndIf
			wait=HERTZ
		Else
			wait:-1
		EndIf

		SetColor(255,255,255)
		
		Local x:Double=(GameState.x+Sin(GameState.ang)*GameState.speed) Mod 800
		Local y:Double=(GameState.y-Cos(GameState.ang)*GameState.speed) Mod 600
		For Local m:Missile=EachIn plist
			m.Update(x,y)
		Next

		SetRotation(0)
	End Function
	
	Function Nuke:Int()
		Local c:Int=plist.Count()
		For Local m:Missile=EachIn plist
			Particles.AddExplosion(m.x,m.y)
		Next
		plist.Clear()
		Return c
	End Function
	
	Function RemoveMissile(m:Missile)
		plist.Remove(m)
	End Function
	
	Function AllDestroyed:Int()
		Return (create=0 And plist.Count()=0)
	End Function
End Type


Type Asteroid
	Field x:Double
	Field y:Double
	Field dx:Double
	Field dy:Double
	Field ang:Double
	Field angi:Double
	
	Method New()
		x=Rand(20,780)
		y=Rand(20,580)
		Repeat
			dx=Rnd(-1,1)
			dy=Rnd(-1,1)
		Until dx<>0 And dy<>0
		
		ang=Rand(360)
		
		If Abs(dx)>Abs(dy)
			angi=dx/2
		Else
			angi=dy/2
		EndIf
	End Method
	
	Method Update()
		ang:+angi
		x=(x+dx) Mod 800
		y=(y+dy) Mod 600
		If x<0 Then x:+800
		If y<0 Then y:+600
		SetRotation(ang)
		DrawImage(GFX.asteroid,x,y)
		Local o:Object[]=CollideImage(GFX.asteroid,x,y,0,MISSILE_LAYER,ASTEROID_LAYER,Self)
		
		If o
			Particles.AddBigExplosion(x,y)
			GameState.AddScore(10*GameState.level)
			MissileSet.RemoveMissile(Missile(o[0]))
			SFX.MissileExplode()
			Return False
		Else
			Return True
		EndIf
	End Method
End Type

Type AsteroidSet
	Global plist:TList

	Function Init()
		plist=CreateList()
	End Function
	
	Function StartLevel()
		plist.Clear()
		For Local f:Int=0 Until Max(5,GameState.max_missile)
			plist.AddLast(New Asteroid)
		Next
	End Function
	
	Function Update()
		Local l:TEasyLink=TEasyLink.Create(plist)
		
		While l.Value()
			Local a:Asteroid=Asteroid(l.Value())

			If (a.Update())
				l.MoveNext()
			Else
				l.Remove()
			EndIf
		Wend
		SetRotation(0)
	End Function
	
	Function Nuke()
		Local c:Int=plist.Count()
		For Local a:Asteroid=EachIn plist
			Particles.AddExplosion(a.x,a.y)
		Next
		plist.Clear()
		Return c
	End Function
End Type