import { RadiansToDegrees } from "common/TrigFunctions";
import { Bin } from "models";
import { GrainCable } from "models/GrainCable";
import { pond } from "protobuf-ts/pond";
import { Vector3 } from "three";
import { avg } from "utils";

export interface CableData {
  cableIndex: number
  radius: number
  topPosition: Vector3
  bottomPosition: Vector3
  grainCable: pond.GrainCable
  radialSegments?: number
  heightSegments?: number
}

export interface CableOrbit {
  orbit: number;
  radius: number;        // in cm
  expectedCount: number;
  assignedCount?: number;
}

/**
 * Effective bin dimensions used for cable placement.
 * Passed in from Bin3dView so that default fallback values are applied
 * consistently — cables will always match the rendered shell even when
 * the bin has no advanced dimensions configured.
 */
export interface BinDims {
  diameter: number
  sidewallHeight: number
  roofHeight: number
  hopperHeight: number
}


function getLayoutFromDiameter(diameterCm: number): CableOrbit[] {
  const diameterFt = diameterCm / 30.48;

  let summaries: { Orbit: number; DistanceFromCenter: number; NumberOfCables: number }[] = [];

  if (diameterFt < 24) {
      summaries.push({ Orbit: 0, DistanceFromCenter: 2, NumberOfCables: 1 });
  } else if (diameterFt < 36) {
      summaries.push({ Orbit: 1, DistanceFromCenter: 7, NumberOfCables: 3 });
  } else if (diameterFt < 42) {
      summaries.push({ Orbit: 0, DistanceFromCenter: 2, NumberOfCables: 1 });
      summaries.push({ Orbit: 1, DistanceFromCenter: 9, NumberOfCables: 3 });
  } else if (diameterFt < 48) {
      summaries.push({ Orbit: 0, DistanceFromCenter: 2, NumberOfCables: 1 });
      summaries.push({ Orbit: 1, DistanceFromCenter: 14, NumberOfCables: 4 });
  } else if (diameterFt < 54) {
      summaries.push({ Orbit: 0, DistanceFromCenter: 2, NumberOfCables: 1 });
      summaries.push({ Orbit: 1, DistanceFromCenter: 16, NumberOfCables: 5 });
  } else if (diameterFt < 60) {
      summaries.push({ Orbit: 0, DistanceFromCenter: 2, NumberOfCables: 1 });
      summaries.push({ Orbit: 1, DistanceFromCenter: 18, NumberOfCables: 6 });
  } else if (diameterFt < 72) {
      summaries.push({ Orbit: 0, DistanceFromCenter: 2, NumberOfCables: 1 });
      summaries.push({ Orbit: 1, DistanceFromCenter: 20, NumberOfCables: 7 });
  } else if (diameterFt < 78) {
      summaries.push({ Orbit: 1, DistanceFromCenter: 10, NumberOfCables: 4 });
      summaries.push({ Orbit: 2, DistanceFromCenter: 27, NumberOfCables: 9 });
  } else if (diameterFt < 90) {
      summaries.push({ Orbit: 1, DistanceFromCenter: 10, NumberOfCables: 4 });
      summaries.push({ Orbit: 2, DistanceFromCenter: 29, NumberOfCables: 10 });
  } else if (diameterFt < 105) {
      summaries.push({ Orbit: 0, DistanceFromCenter: 2, NumberOfCables: 1 });
      summaries.push({ Orbit: 1, DistanceFromCenter: 18, NumberOfCables: 6 });
      summaries.push({ Orbit: 2, DistanceFromCenter: 36, NumberOfCables: 12 });
  } else {
      summaries.push({ Orbit: 1, DistanceFromCenter: 9, NumberOfCables: 3 });
      summaries.push({ Orbit: 2, DistanceFromCenter: 26.5, NumberOfCables: 9 });
      summaries.push({ Orbit: 3, DistanceFromCenter: 44, NumberOfCables: 14 });
  }

  return summaries.map(s => ({
      orbit: s.Orbit,
      radius: s.DistanceFromCenter * 30.48, // ft → cm
      expectedCount: s.NumberOfCables
  }));
};

function distributeCables(cableCount: number, layout: CableOrbit[]) {
  const totalExpected = layout.reduce((sum, o) => sum + o.expectedCount, 0);

  let assigned = layout.map(o => ({
      ...o,
      assignedCount: Math.round((o.expectedCount / totalExpected) * cableCount)
  }));

  // normalize rounding
  let currentTotal = assigned.reduce((sum, o) => sum + (o.assignedCount ?? 0), 0);

  while (currentTotal < cableCount) {
      assigned[assigned.length - 1].assignedCount!++;
      currentTotal++;
  }

  while (currentTotal > cableCount) {
      assigned[assigned.length - 1].assignedCount!--;
      currentTotal--;
  }

  return assigned;
};

function getTopY(radiusFromCenter: number, dims: BinDims) {
  const binRadius = dims.diameter / 2;

  const distanceFromEdge = binRadius - radiusFromCenter;

  // Use the real roof angle when available; when dimensions aren't configured
  // the angle will be 0 which gives a flat cable top — correct for a default shape.
  const angleRad = Math.atan((dims.roofHeight) / (binRadius));

  const roofRise = Math.tan(angleRad) * distanceFromEdge;

  return dims.sidewallHeight / 2 + roofRise;
};

function getBottomY(radiusFromCenter: number, dims: BinDims) {
  const binRadius = dims.diameter / 2;

  const distanceFromCenter = binRadius - radiusFromCenter;

  const angleRad = Math.atan((dims.hopperHeight) / (binRadius))

  const hopperDrop = Math.tan(angleRad) * distanceFromCenter;

  const clearance = 60; // cm

  return -dims.sidewallHeight / 2 - hopperDrop + clearance;
};


export function BuildCableData(bin: Bin, dims: BinDims): CableData[] {
    const cables = [...(bin.status.grainCables ?? [])];

    if (cables.length === 0) return [];

    // optional: sort cables (better visual consistency later)
    //cables.sort((a, b) => b.celcius.length - a.celcius.length);
    cables.sort((a, b) => {
      //if the cables have the same number of nodes
      if (b.celcius.length === a.celcius.length) {
        //sort by temp only last and any type that has humidity first
        if ((avg(a.relativeHumidity) === 0) && (avg(b.relativeHumidity) !== 0)) {
          return 1;
        } else if ((avg(b.relativeHumidity) === 0) && (avg(a.relativeHumidity) !== 0)) {
          return -1;
        } 
        else {
          return a.key > b.key ? 1 : -1;
        }
      }
      //otherwise sort by the longest cable first
      return b.celcius.length - a.celcius.length;
    });

    const layout = getLayoutFromDiameter(dims.diameter);
    const distributed = distributeCables(cables.length, layout);

    const cableRadius = 3;

    const result: CableData[] = [];

    let cableIndex = 0;

    distributed.forEach(orbit => {
        const count = orbit.assignedCount ?? 0;

        const topY    = getTopY(orbit.radius, dims);
        const bottomY = getBottomY(orbit.radius, dims);
    
        if (orbit.orbit === 0 && count > 0) {
            const cable = cables[cableIndex];
            if (!cable) return;
            result.push({
                cableIndex: cableIndex,
                radius: cableRadius,
                topPosition: new Vector3(0, topY, 0),
                bottomPosition: new Vector3(0, bottomY, 0),
                grainCable: cable
            });
            cableIndex++;
            return;
        }
    
        for (let i = 0; i < count; i++) {
            const angle = (i / count) * Math.PI * 2;
            const x = Math.cos(angle) * orbit.radius;
            const z = Math.sin(angle) * orbit.radius;
            const cable = cables[cableIndex];
    
            result.push({
                cableIndex: cableIndex,
                radius: cableRadius,
                topPosition: new Vector3(x, topY, z),
                bottomPosition: new Vector3(x, bottomY, z),
                grainCable: cable
            });
            cableIndex++;
        }
    });

    return result;
};