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import {z} from 'zod';
import {PluginParams, ConfigParams, Method} from '@grnsft/if-core/types';
import {PluginFactory} from '@grnsft/if-core/interfaces';
import {ERRORS} from '@grnsft/if-core/utils';
import {validate} from '../../../common/util/validations';
import {STRINGS} from '../../config';
const {X_Y_EQUAL, ARRAY_LENGTH_NON_EMPTY, WITHIN_THE_RANGE, MISSING_CONFIG} =
STRINGS;
const {ConfigError} = ERRORS;
export const Interpolation = PluginFactory({
configValidation: (config: ConfigParams) => {
if (!config || !Object.keys(config)?.length) {
throw new ConfigError(MISSING_CONFIG);
}
const schema = z
.object({
method: z.nativeEnum(Method),
x: z.array(z.number()),
y: z.array(z.number()),
'input-parameter': z.string(),
'output-parameter': z.string(),
})
.refine(data => data.x && data.y && data.x.length === data.y.length, {
message: X_Y_EQUAL,
})
.refine(data => data.x.length > 1 && data.y.length > 1, {
message: ARRAY_LENGTH_NON_EMPTY,
});
const defaultMethod = config.method ?? Method.LINEAR;
const updatedConfig = Object.assign({}, {method: defaultMethod}, config, {
x: sortPoints(config.x),
y: sortPoints(config.y),
});
return validate<z.infer<typeof schema>>(schema, updatedConfig);
},
inputValidation: (
input: PluginParams,
config: ConfigParams,
index: number | undefined
) => {
const inputParameter = config['input-parameter'];
const schema = z
.object({
timestamp: z.string().or(z.date()),
duration: z.number(),
[inputParameter]: z.number().gte(0).or(z.literal('off')),
})
.refine(
data =>
(data[inputParameter] >= config.x[0] &&
data[inputParameter] <= config.x[config.x.length - 1]) ||
data[inputParameter] === 'off',
{
message: WITHIN_THE_RANGE,
}
);
return validate<z.infer<typeof schema>>(schema, input, index);
},
implementation: async (inputs: PluginParams[], config: ConfigParams) => {
const {
'input-parameter': inputParameter,
'output-parameter': outputParameter,
} = config;
return inputs.map(input => {
if (input[inputParameter] === 'off') {
return {
...input,
[inputParameter]: 0,
[outputParameter]: 0,
};
}
return {
...input,
[outputParameter]: calculateResult(config, input),
};
});
},
allowArithmeticExpressions: ['input-parameter'],
});
/**
* Calculates the appropriate interpolation value based on the specified method type in the config and input parameters.
*/
const calculateResult = (config: ConfigParams, input: PluginParams) => {
const methodType: {[key: string]: number} = {
linear: getLinearInterpolation(config, input),
spline: getSplineInterpolation(config, input),
polynomial: getPolynomialInterpolation(config, input),
};
return methodType[config.method];
};
/**
* Calculates the interpolation when the method is linear.
*/
const getLinearInterpolation = (config: ConfigParams, input: PluginParams) => {
const parameter =
typeof config['input-parameter'] === 'number'
? config['input-parameter']
: input[config['input-parameter']];
const xPoints: number[] = config.x;
const yPoints: number[] = config.y;
const result = xPoints.reduce(
(acc, xPoint, i) => {
if (parameter === xPoint) {
acc.baseCpu = xPoint;
acc.baseRate = yPoints[i];
} else if (parameter > xPoint && parameter < xPoints[i + 1]) {
acc.baseCpu = xPoint;
acc.baseRate = yPoints[i];
acc.ratio = (yPoints[i + 1] - yPoints[i]) / (xPoints[i + 1] - xPoint);
}
return acc;
},
{baseRate: 0, baseCpu: 0, ratio: 0}
);
return result.baseRate + (parameter - result.baseCpu) * result.ratio;
};
/**
* Calculates the interpolation when the method is spline.
*/
const getSplineInterpolation = (config: ConfigParams, input: PluginParams) => {
const parameter =
typeof config['input-parameter'] === 'number'
? config['input-parameter']
: input[config['input-parameter']];
const xPoints: number[] = config.x;
const yPoints: number[] = config.y;
const spline: any = new Spline(xPoints, yPoints);
return spline.at(parameter);
};
/**
* Calculates the interpolation when the method is polynomial.
*/
const getPolynomialInterpolation = (
config: ConfigParams,
input: PluginParams
) => {
const parameter =
typeof config['input-parameter'] === 'number'
? config['input-parameter']
: input[config['input-parameter']];
const xPoints: number[] = config.x;
const yPoints: number[] = config.y;
const result = xPoints.reduce((acc, x, i) => {
const term =
yPoints[i] *
xPoints.reduce((prod, xPoint, j) => {
if (j !== i) {
return (prod * (parameter - xPoint)) / (x - xPoint);
}
return prod;
}, 1);
return acc + term;
}, 0);
return result;
};
/**
* Sorts given point items in ascending order.
*/
const sortPoints = (items: number[]) =>
items.sort((a: number, b: number) => a - b);
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