#include <stdlib.h>
#include <math.h>
#include "constants.h"
#include "game.h"
#include "player.h"
#include "player_data.h"
#include "physics.h"
#include "assets.h"
#include "utils.h"

extern Game game;

static void AddPlayerSprites(Entity* player);
static inline Sprite* GetBodySprite(Entity* player) {
    return &player->sprites[player->bodySpriteIndex];
}

typedef enum PlayerStates {
    PLAYER_IDLE = 0,
    PLAYER_WALKING = 1,
} PlayerStates;

Vector2 GetMovementDirection() {
    Vector2 movementDirection = {0.0f, 0.0f};

    if (IsKeyDown(KEY_W)) {
        movementDirection.y = -1.0f;
    } else if (IsKeyDown(KEY_S)) {
        movementDirection.y = 1.0f;
    }

    if (IsKeyDown(KEY_A)) {
        movementDirection.x = -1.0f;
    } else if (IsKeyDown(KEY_D)) {
        movementDirection.x = 1.0f;
    }

    if (Vector2Length(movementDirection) > 0.0f)
        return Vector2Normalize(movementDirection);

    return movementDirection;
}

void CameraFollow(const Entity* player) {
    game.camera.target =
        (Vector2) {fmaxf(WINDOW_WIDTH / 2.0f, player->position.x), 0.0f};
}

void UpdateAnimationState(Entity* player) {
    Sprite* bodySprite = GetBodySprite(player);

    if (Vector2Length(player->velocity) > 0.0)
        bodySprite->currentAnimation = PLAYER_WALKING;
    else
        bodySprite->currentAnimation = PLAYER_IDLE;
}

void UpdateBodyFacing(Entity* player) {
    Sprite* bodySprite = GetBodySprite(player);

    if (player->velocity.x < 0)
        bodySprite->flipX = true;
    else if (player->velocity.x > 0)
        bodySprite->flipX = false;
}

void UpdatePlayer(Entity* player, float deltaTime) {
    player->velocity =
        Vector2Scale(GetMovementDirection(), PLAYER_SPEED);

    UpdateAnimationState(player);
    UpdateBodyFacing(player);
    MoveAndSlide(player, deltaTime);
    CameraFollow(player);
    UpdateCurrentSpriteAnimation(GetBodySprite(player), deltaTime);
}

void AddPlayer(float xpos, float ypos) {
    Entity player = {0};
    player.type = Player_Entity;

    player.position = (Vector2) {xpos, ypos};
    player.flags |= (ENTITY_PHYSICS_ACTIVE | ENTITY_VISIBLE);

    player.physicsCollider = physicsCollider;

    #ifdef BEATEMUP_DEBUG
        player.physicsColliderColor = RED;
    #endif

    AddPlayerSprites(&player);
    AddEntity(&player);
}

static void AddPlayerSprites(Entity* player) {
    Asset* shadowTexture = GetMatchingAssetExitOnFail("human-shadow", Texture_Asset);

    Sprite shadowSprite = (Sprite) {
        .texture = shadowTexture->texture,
        .layer = Foreground_Layer,
        .destRect = shadowDestRect,

        .numAnimations = 0, //Not an animated sprite
    };
    AddSpriteToEntity(player, shadowSprite);

    Asset* bodyTexture = GetMatchingAssetExitOnFail("player-body", Texture_Asset);

    Sprite bodySprite = (Sprite) {
        .texture = bodyTexture->texture,
        .layer = Foreground_Layer,

        .destRect = bodyDestRect,
        .numAnimations = 0
    };

    //The body texture devided into a 10x10 grid
    //with one cell representing a frame of animation
    Animation idleAnimation =
        AnimationFromIndices((AnimationFromIndicesParams){
                .texture = bodyTexture->texture,
                .isLooping = true,
                .numFrames = 4,

                .framesX = 10,
                .framesY = 10,

                .indices = (int[]) {0, 1, 2, 3},
                .frameTimes = (float[]) {0.1f, 0.1f, 0.1f, 0.1f}
            });
    bodySprite.animations[PLAYER_IDLE] = idleAnimation;

    Animation walkingAnimation =
        AnimationFromIndices((AnimationFromIndicesParams){
                .texture = bodyTexture->texture,
                .isLooping  = true,
                .numFrames = 7,

                .framesX = 10,
                .framesY = 10,

                .indices = (int[]) {10, 11, 12, 13, 14, 15, 16, 17},
                .frameTimes = (float[]) {0.1f, 0.1f, 0.1f, 0.1f, 0.1f, 0.1f, 0.1f}
            });
    bodySprite.animations[PLAYER_WALKING] = walkingAnimation;

    bodySprite.numAnimations = 2;
    player->bodySpriteIndex = AddSpriteToEntity(player, bodySprite);
}