/*
 * Flotsam.cs
 * Authors:     August Zinsser
 * 
 * Copyright Matthew Belmonte 2007
 */


using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using tAC_Engine;


namespace Astropolis
{
    /// <summary>
    /// The items that the friendly ships in Meteor Madness throw to the player
    /// They upgrade the player's weapon and grant him/her a resource when the player's ship collides with this
    /// </summary>
    class Flotsam : UFO
    {
        private string mResource;
        private int mValue;


        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="resourceType">Type of resource to award the player for collecting this powerup</param>
        /// <param name="value">Amount of that resource to award</param>
        /// <param name="texture">Image of the powerup</param>
        /// <param name="width">In Space3D units</param>
        /// <param name="height">In Space3D units</param>
        /// <param name="depth">In Space3D units</param>
        public Flotsam(string resourceType, int value, Texture2D texture, float width, float height, float depth)
            : base(texture, width, height, depth, 10)
        {
            mResource = resourceType;
            mValue = value;

            // Add a bit of rotation for aesthetics
            mAngVel = GenericBaseApplication.GameManager.RandomNumber(-5f, 5f);    
            mRot = GenericBaseApplication.GameManager.RandomNumber(0f, (float)Math.PI * 2f);
        }


        /// <summary>
        /// Deals the specified amount of damage to this flotsam, potentially destroying it
        /// </summary>
        /// <param name="damage"></param>
        public override void GetHit(int damage)
        {
            mHitPoints -= damage;
            if (mHitPoints < 0)
                Destroy();
        }


        /// <summary>
        /// Flotsam does not react, so this method does nothing
        /// </summary>
        /// <returns></returns>
        public override bool React(CheetahFighter playerShip)
        {
            return false;
        }


        /// <summary>
        /// Spawns the appropriate particle effects and/or entities
        /// </summary>
        public override void Destroy()
        {
            mAlive = false;
        }


        /// <summary>
        /// Some flotsam moves based on the player's location
        /// </summary>
        /// <param name="playerShip"></param>
        public void Update(Entity playerShip)
        {
            base.Update();

            if (mResource == AstroResources.Credits)
            {
                // Home in on the player
                Vector3 oldTraj = mVel;
                float speed = Math.Max(mVel.Length(), ((MeteorMadness)AstroBaseApplication.MiniGame).ShooterSpeed * 10f);
                float correctionFactor = 1 - Math.Min(.925f, mPos.Z);
                Vector3 correctiveTraj;
                if (playerShip != null)
                    correctiveTraj = playerShip.Position - mPos;
                else
                    correctiveTraj = mPos;
                correctiveTraj.Normalize();
                correctiveTraj = Vector3.Multiply(correctiveTraj, correctionFactor);
                oldTraj.Normalize();
                oldTraj = Vector3.Multiply(oldTraj, 1 - correctionFactor);
                mVel = correctiveTraj + oldTraj;
                mVel = Vector3.Multiply(mVel, speed);
            }
        }


        /// <summary>
        /// Awards the appropriate resources and upgrades the players' weapons
        /// </summary>
        public override void CollideWithPlayer(Entity player)
        {
            int screenCenterX = GenericBaseApplication.GameManager.ScreenWidth / 2;
            int screenCenterY = GenericBaseApplication.GameManager.ScreenHeight / 2;
            Rectangle proj = Space3D.Project(player.X, player.Y, player.Z, this.Width, this.Height, -1f);

            if (mResource != "")
            {
                // Gather the resource
                AstroBaseApplication.MiniGame.Score.Gather(mResource, mValue);

                if (((MeteorMadness)AstroBaseApplication.MiniGame).DisplayWaitTimer < 0)
                {
                    // Display a ticker
                    string text = "+";
                    if (mResource == "Money")
                        text += "$" + mValue;
                    else
                        text += mResource;
                    Ticker.Display(
                        text,
                        null,
                        Vector2.Zero,
                        new Vector2(proj.X - screenCenterX, proj.Y - screenCenterY),
                        new Vector2(0, -50f),
                        Ticker.Font.InGame_Tiny,
                        Color.LimeGreen,
                        1f,
                        1f,
                        true);

                    ((MeteorMadness)AstroBaseApplication.MiniGame).ResetDisplayWaitTimer();
                }

                Logger.LogCode(Logger.ExperimentalCode.MM_ShooterPlayerCollectibleCollision, mResource);
            }
            else
            {
                // Upgrade weapons
                ((MeteorMadness)AstroBaseApplication.MiniGame).CollectedUpgrades = ((MeteorMadness)AstroBaseApplication.MiniGame).CollectedUpgrades + 1;
                AstroBaseApplication.GameManager.DotWeaponCooldown *= .90f;
                Ticker.Display(
                    "+Weapon",
                    null,
                    Vector2.Zero,
                    new Vector2(proj.X - screenCenterX, proj.Y - screenCenterY),
                    new Vector2(0, -50f),
                    Ticker.Font.InGame_Tiny,
                    Color.Aqua,
                    1f,
                    1f,
                    true);

                Logger.LogCode(Logger.ExperimentalCode.MM_ShooterPlayerCollectibleCollision, "Weapon Upgrade");
            }

            mAlive = false;
        }
    }
}