const PRNG = require('./prng');
const utils = require('./utils');

function Planet(name, seed, orbitalRadius, insolation) {
    this.name = name;
    this.seed = seed;
    this.orbitalRadius = orbitalRadius * 10;
    this.insolation = insolation;
    return this;
}

Planet.prototype.detail = function() {
    var pseudoRandom = new PRNG(this.seed), detail = {}, template;
    detail.name = this.name;
    detail.orbitalRadius = this.orbitalRadius;
    detail.insolation = this.insolation;
    detail.blackbodyK = utils.blackbody(detail.insolation);
    template = pseudoRandom.pick(planetTypes, [detail.insolation * 100, 10, 1]);
    detail.classification = template.classification;
    detail.radius = pseudoRandom.range(template.radius[0], template.radius[1]) / 2200;
    detail.density = pseudoRandom.realRange(template.density[0], template.density[1]);
    detail.gravity = utils.gravity(detail.radius, detail.density);
    detail.hydrographics = template.hydrographics(pseudoRandom, detail.insolation, detail.radius, detail.density);
    detail.atmosphere = template.atmosphere(pseudoRandom, detail.insolation, detail.radius, detail.density, detail.hydrographics);
    detail.HI = template.HI(detail.insolation, detail.radius, detail.density, detail.hydrographics, detail.atmosphere);
    return detail;
};

Planet.prototype.description = function() {
  return this.detail();
};

var planetTypes = [
  {
    classification: "rocky",
    radius: [1000, 15000],
    density: [2, 8],
    hydrographics: function(pnrg, insolation, radius, density) {
        var g = utils.gravity(radius, density),
            tempK = utils.blackbody(insolation, 0);
        return Math.clamp(pnrg.realRange(-50, 150 - Math.abs(tempK - 270)) * g - Math.abs(density - 5.5) * 10, 0, 100);
    },
    atmosphere: function(pnrg, insolation, radius, density, hydrographics) {
        var g = utils.gravity(radius, density);
        if (hydrographics > 0 && insolation > 0.25 && insolation < 2) {
            return pnrg.pick(['Breathable', 'Filterable', 'Inert', 'Toxic', 'Corrosive', 'Trace'], [1, 2, 2, 1, 1, 1]);
        } else {
            return pnrg.pick(['Breathable', 'Filterable', 'Inert', 'Toxic', 'Corrosive', 'Trace'], [1, 2, 3, 4, 5, 5]);
        }
    },
    HI: function(insolation, radius, density, hydrographics, atmosphere) {
        var g = utils.gravity(radius, density),
            tempK = utils.blackbody(insolation, 0);
        if (atmosphere === "Breathable" && hydrographics > 0 && g < 1.25 && tempK > 230 && tempK < 280) {
            return 1;
        } else if ((atmosphere === "Breathable" || atmosphere === 'Filterable') && g < 2 && tempK > 200 && tempK < 310) {
            return 2;
        } else if (atmosphere === "Corrosive" || g > 2 || tempK > 400) {
            return tempK > 1000 ? 5 : 4;
        } else {
            return 3;
        }
    }
},
{
    classification: "gas giant",
    radius: [15000, 120000],
    density: [0.6, 2.0],
    hydrographics: utils.fixed_value(0),
    atmosphere: utils.fixed_value("Crushing"),
    HI: utils.fixed_value(4)
},
{
    classification: "brown dwarf",
    radius: [120000, 250000],
    density: [0.6, 2.0],
    hydrographics: utils.fixed_value(0),
    atmosphere: utils.fixed_value("Crushing"),
    HI: utils.fixed_value(5)
}];


module.exports = Planet;