#include <raylib.h>
#include <math.h>
#include <stdio.h>

int main() {
    const int ScreenW = 800;
    const int ScreenH = 600;
    float radius = 200.0f;
    float visAngle = 0;//Visual representaiton of angle
    float angle = -260.0f;
    float smoothing = 0.1f;
    int gear = 1;

    SetConfigFlags(FLAG_WINDOW_HIGHDPI);
    InitWindow(ScreenW, ScreenH, "engine rev");
    SetTargetFPS(60);

    while (!WindowShouldClose()) {
        if (IsKeyDown(KEY_W)) {
            if (angle < -15.0f) angle += 1.0f; // Limit to 7500 RPM
            if (angle > 10.0f) angle = angle; // Clamp
        }
        if (IsKeyDown(KEY_S)) {
            if (angle > -270.0f) angle -= 1.0f;
            if (angle < -260.0f) angle = -260.0f;
        }
        if (IsKeyPressed(KEY_E)) {
            if (gear < 7) {
                gear ++;
                if (angle < -225.0f ) angle = angle;
                if (angle >= -225.0f )
                {
                    angle -= 30.0f;
                }

            }
            if (gear > 7) gear = 7;
        }
        if (IsKeyPressed(KEY_Q)) {
            if (gear < 1) gear = 1;
            if (gear > 1)
            {
                gear --;
                if (angle <= -45.0f)
                {
                    angle += 30.0f;
                }

                if (angle > -45.0f) angle = angle;
            }
        }
        // Convert angle to radians
        float radians = angle * DEG2RAD;

        // Calculate tip of line using trig
        float tipX = ScreenW / 2 + radius * cosf(radians);
        float tipY = ScreenH / 2 + radius * sinf(radians);
        Vector2 center = { ScreenW / 2.0f, ScreenH / 2.0f };
        BeginDrawing();
        DrawCircleV((Vector2){ScreenW/2, ScreenH/2}, radius, BLACK);
        // rev segments
        for (int i = -270; i <= 0; i += 15) {
            float rad = i * DEG2RAD;
            float innerX = center.x + (radius - 20) * cosf(rad);
            float innerY = center.y + (radius - 20) * sinf(rad);
            float outerX = center.x + radius * cosf(rad);
            float outerY = center.y + radius * sinf(rad);

            DrawLineEx((Vector2){innerX, innerY}, (Vector2){outerX, outerY}, 2.0f, WHITE);
        }
        // Optional: colored zones (redline)
        for (float i = -30; i <= 0; i += 5)
        {
            float rad = i * DEG2RAD;
            float x1 = center.x + (radius - 20) * cosf(rad);
            float y1 = center.y + (radius - 20) * sinf(rad);
            float x2 = center.x + radius * cosf(rad);
            float y2 = center.y + radius * sinf(rad);

            DrawLineEx((Vector2){x1, y1}, (Vector2){x2, y2}, 2.0f, RED);
        }

        // Draw needle (angle from center)
        visAngle += (angle-visAngle)*.1;//Move towards actual angle
        float needleRad = visAngle * DEG2RAD;
        float needleX = center.x + (radius - 30) * cosf(needleRad);
        float needleY = center.y + (radius - 30) * sinf(needleRad);
        DrawLineEx(center, (Vector2){needleX, needleY}, 4.0f, RED);

        // Center dot
        DrawCircleV(center, 6, RED);

        // Optional: Draw labels (1 to 8)
        int labelCount = 10;
        for (int i = 0; i < labelCount; i++)
        {
            float labelAngle = -270 + (270.0f / (labelCount - 1)) * i;
            float rad = labelAngle * DEG2RAD;
            float tx = center.x + (radius - 40) * cosf(rad);
            float ty = center.y + (radius - 40) * sinf(rad);

            char label[3];
            sprintf(label, "%d", i + 1);
            DrawText(label, tx - 10, ty - 10, 20, RAYWHITE);
        }
        //gearing
        char Gear[8];
        sprintf(Gear, "%d", gear);
        DrawText(Gear, ScreenW/2 + 87, ScreenH/2 + 87, 20, WHITE);
        ClearBackground(BLACK);
        EndDrawing();
    }

    CloseWindow();
    return 0;
}