import * as rlc from "raylib.core"

// Initialization
//--------------------------------------------------------------------------------------
const screenWidth = 800;
const screenHeight = 450;
const MAX_BUILDINGS = 100

rlc.initWindow(screenWidth, screenHeight, "raylib [core] example - 2d camera");

const player = new rlc.Rectangle(400, 280, 40, 40);
const buildings = new Array(MAX_BUILDINGS);
const buildColors = new Array(MAX_BUILDINGS);

let spacing = 0;

for (let i = 0; i < MAX_BUILDINGS; i++)
{
    buildings[i].width = rlc.getRandomValue(50, 200);
    buildings[i].height = rlc.getRandomValue(100, 800);
    buildings[i].y = screenHeight - 130.0 - buildings[i].height;
    buildings[i].x = -6000.0 + spacing;

    spacing += buildings[i].width;

    buildColors[i] = new rlc.Color(rlc.getRandomValue(200, 240), rlc.getRandomValue(200, 240), rlc.getRandomValue(200, 250), 255);
}

Camera2D camera = { 0 };
camera.target = (Vector2){ player.x + 20.0f, player.y + 20.0f };
camera.offset = (Vector2){ screenWidth/2.0f, screenHeight/2.0f };
camera.rotation = 0.0f;
camera.zoom = 1.0f;

SetTargetFPS(60);                   // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------

// Main game loop
while (!WindowShouldClose())        // Detect window close button or ESC key
{
    // Update
    //----------------------------------------------------------------------------------
    // Player movement
    if (IsKeyDown(KEY_RIGHT)) player.x += 2;
    else if (IsKeyDown(KEY_LEFT)) player.x -= 2;

    // Camera target follows player
    camera.target = (Vector2){ player.x + 20, player.y + 20 };

    // Camera rotation controls
    if (IsKeyDown(KEY_A)) camera.rotation--;
    else if (IsKeyDown(KEY_S)) camera.rotation++;

    // Limit camera rotation to 80 degrees (-40 to 40)
    if (camera.rotation > 40) camera.rotation = 40;
    else if (camera.rotation < -40) camera.rotation = -40;

    // Camera zoom controls
    camera.zoom += ((float)GetMouseWheelMove()*0.05f);

    if (camera.zoom > 3.0f) camera.zoom = 3.0f;
    else if (camera.zoom < 0.1f) camera.zoom = 0.1f;

    // Camera reset (zoom and rotation)
    if (IsKeyPressed(KEY_R))
    {
        camera.zoom = 1.0f;
        camera.rotation = 0.0f;
    }
    //----------------------------------------------------------------------------------

    // Draw
    //----------------------------------------------------------------------------------
    BeginDrawing();

        ClearBackground(RAYWHITE);

        BeginMode2D(camera);

            DrawRectangle(-6000, 320, 13000, 8000, DARKGRAY);

            for (int i = 0; i < MAX_BUILDINGS; i++) DrawRectangleRec(buildings[i], buildColors[i]);

            DrawRectangleRec(player, RED);

            DrawLine((int)camera.target.x, -screenHeight*10, (int)camera.target.x, screenHeight*10, GREEN);
            DrawLine(-screenWidth*10, (int)camera.target.y, screenWidth*10, (int)camera.target.y, GREEN);

        EndMode2D();

        DrawText("SCREEN AREA", 640, 10, 20, RED);

        DrawRectangle(0, 0, screenWidth, 5, RED);
        DrawRectangle(0, 5, 5, screenHeight - 10, RED);
        DrawRectangle(screenWidth - 5, 5, 5, screenHeight - 10, RED);
        DrawRectangle(0, screenHeight - 5, screenWidth, 5, RED);

        DrawRectangle( 10, 10, 250, 113, Fade(SKYBLUE, 0.5f));
        DrawRectangleLines( 10, 10, 250, 113, BLUE);

        DrawText("Free 2d camera controls:", 20, 20, 10, BLACK);
        DrawText("- Right/Left to move Offset", 40, 40, 10, DARKGRAY);
        DrawText("- Mouse Wheel to Zoom in-out", 40, 60, 10, DARKGRAY);
        DrawText("- A / S to Rotate", 40, 80, 10, DARKGRAY);
        DrawText("- R to reset Zoom and Rotation", 40, 100, 10, DARKGRAY);

    EndDrawing();
    //----------------------------------------------------------------------------------
}

// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow();        // Close window and OpenGL context
//--------------------------------------------------------------------------------------