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

type ICpAndTotalFound = Record<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);
};

const familyOrder : Array<string> = [];
const familyEvolutionOrder : Record<string, Array<string>> = {};
const familyEncountered : Record<string, Array<ILeaguePokemon>> = {};
Pokemon.forEach((mon) => {
    const baseAtk = mon.stats.baseAttack;
    const baseDef = mon.stats.baseDefense;
    const baseHp = mon.stats.baseStamina;
    const pokemon : ILeaguePokemon = {
        id: mon.id,
        name: mon.name,
        dex: mon.dex,
        stats: mon.stats,
        family: mon.family.id,
        pvp: {
            great: [],
            ultra: [],
        },
    };

    // keep track of family order and membership
    if (typeof familyEncountered[pokemon.family] === 'undefined') {
        familyOrder.push(pokemon.family);
        familyEncountered[pokemon.family] = [];
    }
    familyEncountered[pokemon.family].push(pokemon);

    if (typeof mon.evolution.pastBranch === 'undefined' &&
        typeof familyEvolutionOrder[pokemon.family] === 'undefined' &&
        pokemon.id.indexOf('_ALOLA') === -1 // because RAICHU_ALOLA shows up before PICHU, but PICHU is the family origin
    ) {
        familyEvolutionOrder[pokemon.family] = [];
        if (mon.forms.length > 0) {
            mon.forms.forEach((form) => {
                familyEvolutionOrder[pokemon.family].push(form.id);
            });
        } else {
            familyEvolutionOrder[pokemon.family].push(pokemon.id);
        }

        // TODO: if `mon.forms.length > 0`, there's a chance the order will get weird by doing this:
        if (typeof mon.evolution.futureBranches !== 'undefined') {
            (function traverseEvolutionBranches(root) {
                root.forEach((evolution) => {
                    familyEvolutionOrder[pokemon.family].push(evolution.id);
                    // unfortunate workaround for typescript limitation in JSON parsing being TOO good...
                    // if (typeof evolution !== 'undefined') {
                    if ('futureBranches' in evolution) {
                        // traverseEvolutionBranches(evolution.futureBranches);
                        traverseEvolutionBranches(evolution['futureBranches']);
                    }
                });
            })(mon.evolution.futureBranches);
        }
    }

    // calculate stats for all possible IVs
    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;

                    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(pokemon.pvp).forEach((key) => {
        const league = key as League;

        const orderedCombinedStats = Object.keys(combinedStatsDistribution[league]).map(cpTotal => parseInt(cpTotal)).sort();
        const len = orderedCombinedStats.length - 1;
        const offset = orderedCombinedStats[1];
        const max = orderedCombinedStats[len] - offset; // index 0 is always `Grade.S`
        for (let index = len; 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 === len) {
                    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;
                    }
                }
                pokemon.pvp[league].push(pokemonStats);
            });
            combinedStatsDistribution[league][combinedStats].sort((a, b) => {
                if (a.total !== b.total) {
                    return a.total < b.total ? -1 : 1;
                }
                if (a.level !== b.level) {
                    return a.level < b.level ? -1 : 1;
                }
                return 0;
            });
            pokemon.pvp[league].push(...combinedStatsDistribution[league][combinedStats]);
        }
    });

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

const pokemonOrder : Array<IPokemon> = [];
familyOrder.forEach((familyId) => {
    familyEvolutionOrder[familyId].forEach((id, order) => {
        familyEncountered[familyId].some((pokemon, index) => {
            if (id === pokemon.id && order !== index) {
                familyEncountered[familyId].splice(order, 0, familyEncountered[familyId].splice(index, 1)[0]);
                return true;
            }
            return false;
        });
    });

    familyEncountered[familyId].forEach((leaguePokemon) => {
        const { pvp, ...pokemon } = leaguePokemon;
        pokemonOrder.push(pokemon);
    });
});

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