import * as fs from 'fs';
import Pokemon from 'pokemongo-json-pokedex/output/pokemon.json';
import { IPokemon, IStats, League, Grade } from './src/ts/models/Pokemon';

interface ICpAndTotalFound {
    [ key : number ] : Array<IStats>;
}
interface IStatsDistribution {
    great : ICpAndTotalFound;
    ultra : ICpAndTotalFound;
}
interface IMaxCpByLeague {
    great : number;
    ultra : number;
}

const outPath = './dist/db/';

const maxCpByLeague : IMaxCpByLeague = {
    great: 1500,
    ultra: 2500
};

const cpMultipliers : Array<number> = JSON.parse(fs.readFileSync('src/db/cpMultipliers.json', 'utf8'));
const getClosestCpMultiplierIndex = (value : number) => {
    let i;
    for (i = 0; i < cpMultipliers.length; i++) {
      if (value < cpMultipliers[i]) {
        break;
      }
    }
    return Math.max(i - 1, 0);
};

Pokemon.forEach((mon) => {
    const baseAtk = mon.stats.baseAttack;
    const baseDef = mon.stats.baseDefense;
    const baseHp = mon.stats.baseStamina;
    const stats : IPokemon = {
        name: mon.name,
        id: mon.dex,
        stats: mon.stats,
        pvp: {
            great: [],
            ultra: [],
        },
    };

    const combinedStatsDistribution : IStatsDistribution = {
        great: {},
        ultra: {},
    };
    for (let ivHp = 15; ivHp >= 0; ivHp--) {
        for (let ivAtk = 15; ivAtk >= 0; ivAtk--) {
            for (let ivDef = 15; ivDef >= 0; ivDef--) {
                let pokemonWithIvs : IStats;
                const cpMultiplier = (baseAtk + ivAtk) * Math.sqrt(baseDef + ivDef) * Math.sqrt(baseHp + ivHp);

                Object.keys(maxCpByLeague).forEach((key) => {
                    const league = key as League;
                    const maxCp = maxCpByLeague[league];
                    const maxLeagueLevelMultiplierIndex = getClosestCpMultiplierIndex(Math.sqrt((maxCp * 10) / cpMultiplier));
                    const maxLeagueLevelMultiplier = cpMultipliers[maxLeagueLevelMultiplierIndex];
                    const maxLeagueCp = ~~((cpMultiplier * Math.pow(maxLeagueLevelMultiplier, 2)) / 10);
                    const maxLeagueLevel = (maxLeagueLevelMultiplierIndex + 2) / 2;
                    pokemonWithIvs = {
                        cp: maxLeagueCp,
                        level: maxLeagueLevel,
                        ivHp: ivHp,
                        ivAtk: ivAtk,
                        ivDef: ivDef,
                        hp: ~~((baseHp + ivHp) * maxLeagueLevelMultiplier),
                        atk: ~~((baseAtk + ivAtk) * maxLeagueLevelMultiplier),
                        def: ~~((baseDef + ivDef) * maxLeagueLevelMultiplier),
                        total: 0,
                        speciesGrade: Grade.F,
                        metaGrade: Grade.F,
                    };
                    pokemonWithIvs.total = pokemonWithIvs.hp + pokemonWithIvs.atk + pokemonWithIvs.def;
                    stats.pvp[league].push(pokemonWithIvs);

                    const combinedStats = maxLeagueCp + pokemonWithIvs.total;
                    combinedStatsDistribution[league][combinedStats] = combinedStatsDistribution[league][combinedStats] || [];
                    combinedStatsDistribution[league][combinedStats].push(pokemonWithIvs);
                });
            }
        }
    }

    // process the pokemon stats for league-worthiness
    Object.keys(stats.pvp).forEach((key) => {
        const league = key as League;
        stats.pvp[league].sort((a, b) => {
            if (a.total === b.total) {
                return a.total > b.total ? 0 : 1;
            }
            return a.level > b.level ? 0 : 1;
        });

        const orderedCombinedStats = Object.keys(combinedStatsDistribution[league]).map(cpTotal => parseInt(cpTotal)).sort();
        const offset = orderedCombinedStats[orderedCombinedStats.length - 1];
        const max = orderedCombinedStats[1] - offset; // index 0 is always `Grade.S`
        for (let index = orderedCombinedStats.length - 1; index >= 0; index--) {
            const combinedStats = orderedCombinedStats[index];
            const percent = (combinedStats - offset) / max;

            // remove all `Grade.F` stats (to save space in the DB)
            if (percent < 0.6) {
                delete combinedStatsDistribution[league][combinedStats];
                continue;
            }

            combinedStatsDistribution[league][combinedStats].forEach((pokemonStats) => {
                if (index === 0) {
                    pokemonStats.speciesGrade = Grade.S;
                } else {
                    if (percent >= 0.9) {
                        pokemonStats.speciesGrade = Grade.A;
                    } else if (percent >= 0.8) {
                        pokemonStats.speciesGrade = Grade.B;
                    } else if (percent >= 0.7) {
                        pokemonStats.speciesGrade = Grade.C;
                    } else if (percent >= 0.6) {
                        pokemonStats.speciesGrade = Grade.D;
                    }
                }
            });
        }
    });

    fs.mkdir(outPath, {recursive: true}, () => {
        fs.writeFile(outPath + mon.id + '.json', JSON.stringify(stats), (err) => {
            if(err) {
                return console.log(mon.name, err);
            }
            console.log(mon.name);
        });
    });
});