import React from 'react';

import { Grade, ILeaguePokemon, IStats } from 'app/models/Pokemon';
import { calculateCp, calculateStatAtLevel } from 'app/utils/calculator';

import { IIndividualValues, IndividualValueKey } from './types';

import { LeagueStatsList } from './LeagueStatsList';

export interface IPokemonExplorerProps {
    isLoading : boolean;
    leaguePokemon : ILeaguePokemon;
    individualValues : IIndividualValues;

    handleChangeIndividualValue : (stat : IndividualValueKey, value : number | null) => void;
}

interface IState {
    form : {
        level : string;
    };
}

export class PokemonExplorer extends React.Component<IPokemonExplorerProps, IState> {
    private readonly MIN_LEVEL = 1;
    private readonly MAX_LEVEL = 40;
    private readonly MIN_IV = 0;
    private readonly MAX_IV = 15;

    private handleChangeHp : (event : React.ChangeEvent<HTMLInputElement>) => void;
    private handleChangeAtk : (event : React.ChangeEvent<HTMLInputElement>) => void;
    private handleChangeDef : (event : React.ChangeEvent<HTMLInputElement>) => void;

    constructor(props : IPokemonExplorerProps) {
        super(props);

        this.state = {
            form: {
                level: '',
            }
        };

        this.handleChangeHp = this.handleChangeIvFactory('hp');
        this.handleChangeAtk = this.handleChangeIvFactory('atk');
        this.handleChangeDef = this.handleChangeIvFactory('def');
    }

    public render() {
        const {
            individualValues,
            leaguePokemon
        } = this.props;
        const league = 'great'; // TODO: this should be a prop

        let rankedPokemon : IStats | null = null;
        let placeholderLevel = '';
        let placeholderHp = '';
        let placeholderAtk = '';
        let placeholderDef = '';

        const individualValueLevel = this.state.form.level !== '' ? this.state.form.level : individualValues.level;

        // default to first pokemon (should be S tier)
        if (individualValueLevel === null &&
            individualValues.hp === null &&
            individualValues.atk === null &&
            individualValues.def === null
        ) {
            rankedPokemon = leaguePokemon.pvp[league][0];
            placeholderLevel = '' + rankedPokemon.level;
            placeholderHp = '' + rankedPokemon.ivHp;
            placeholderAtk = '' + rankedPokemon.ivAtk;
            placeholderDef = '' + rankedPokemon.ivDef;

        // a full spec'd pokemon has been entered
        } else if (individualValueLevel !== null && typeof individualValueLevel === 'number' &&
            individualValues.hp !== null &&
            individualValues.atk !== null &&
            individualValues.def !== null
        ) {
            leaguePokemon.pvp[league].some((stats) => {
                if (individualValueLevel === stats.level &&
                    individualValues.hp === stats.ivHp &&
                    individualValues.atk === stats.ivAtk &&
                    individualValues.def === stats.ivDef
                ) {
                    rankedPokemon = stats;
                    return true;
                }
                return false;
            });

            // we don't have the data for this terrible mon
            if (rankedPokemon === null) {
                rankedPokemon = {
                    cp: calculateCp(leaguePokemon.stats, individualValueLevel, individualValues.hp, individualValues.atk, individualValues.def),
                    level: individualValueLevel,
                    ivHp: individualValues.hp,
                    ivAtk: individualValues.atk,
                    ivDef: individualValues.def,
                    hp: calculateStatAtLevel(individualValueLevel, leaguePokemon.stats.baseStamina, individualValues.hp),
                    atk: calculateStatAtLevel(individualValueLevel, leaguePokemon.stats.baseAttack, individualValues.atk),
                    def: calculateStatAtLevel(individualValueLevel, leaguePokemon.stats.baseDefense, individualValues.def),
                    total: 0,
                    speciesGrade: Grade.F,
                    metaGrade: Grade.F,
                };
                rankedPokemon.total = rankedPokemon.hp + rankedPokemon.atk + rankedPokemon.def;
            }
        }

        const rankedGrade = rankedPokemon !== null ? Grade[rankedPokemon.speciesGrade] : '-';
        const rankedCp = rankedPokemon !== null ? rankedPokemon.cp : '-';
        const rankedHp = rankedPokemon !== null ? rankedPokemon.hp : '-';
        const rankedAtk = rankedPokemon !== null ? rankedPokemon.atk : '-';
        const rankedDef = rankedPokemon !== null ? rankedPokemon.def : '-';

        return (
            <div id="pokemon-explorer">
                <h2 className="pokemon-info">
                    <span>{ this.formatDexNumber(leaguePokemon.dex) }</span>
                    { leaguePokemon.name }
                </h2>
                <div className="pokemon-base-stats">
                    <div>Base Stats</div>
                    <div className="pokemon-type type-1">{  }</div>
                    <div className="pokemon-type type-2">{  }</div>
                    <div>{ leaguePokemon.stats.baseStamina }</div>
                    <div>{ leaguePokemon.stats.baseAttack }</div>
                    <div>{ leaguePokemon.stats.baseDefense }</div>
                </div>
                <div className="pokemon-individual-stats">
                    <div>
                        <h5>Level</h5>
                        <input
                            name="level"
                            type="number"
                            min={ this.MIN_LEVEL }
                            max={ this.MAX_LEVEL }
                            step={ 0.5 }
                            onChange={ this.handleChangeLevel }
                            value={ individualValueLevel !== null ? individualValueLevel : '' }
                            placeholder={ placeholderLevel }
                        />
                    </div>
                    <div>
                        <h5>IVs</h5>
                        <label>
                            <input
                                name="hp"
                                type="number"
                                min={ this.MIN_IV }
                                max={ this.MAX_IV }
                                maxLength={ 2 }
                                onChange={ this.handleChangeHp }
                                value={ individualValues.hp !== null ? individualValues.hp : '' }
                                placeholder={ placeholderHp }
                            /> HP
                        </label>
                        <label>
                            <input
                                name="atk"
                                type="number"
                                min={ this.MIN_IV }
                                max={ this.MAX_IV }
                                maxLength={ 2 }
                                onChange={ this.handleChangeAtk }
                                value={ individualValues.atk !== null ? individualValues.atk : '' }
                                placeholder={ placeholderAtk }
                            /> ATK
                        </label>
                        <label>
                            <input
                                name="def"
                                type="number"
                                min={ this.MIN_IV }
                                max={ this.MAX_IV }
                                maxLength={ 2 }
                                onChange={ this.handleChangeDef }
                                value={ individualValues.def !== null ? individualValues.def : '' }
                                placeholder={ placeholderDef }
                            /> DEF
                        </label>
                    </div>
                </div>
                <div className="league-pokemon-rank">
                    <div className="league-pokemon-stat pokemon-rank"><span>{ rankedGrade }</span> Rank</div>
                    <div className="league-pokemon-stat pokemon-cp">CP <span>{ rankedCp }</span></div>
                    <div className="league-pokemon-stat"><span>{ rankedHp }</span> HP</div>
                    <div className="league-pokemon-stat"><span>{ rankedAtk }</span> ATK</div>
                    <div className="league-pokemon-stat"><span>{ rankedDef }</span> DEF</div>
                </div>
                <LeagueStatsList
                    activeIndividualValues={ individualValues }
                    leagueStatsList={ leaguePokemon.pvp[league] }
                    handleActivateLeagueStats={ this.handleActivateLeagueStats }
                />
            </div>
        );
    }

    private formatDexNumber(dex : number) {
        let prefix : string = '#';
        if (dex < 100) {
            prefix += '0';
        }
        if (dex < 10) {
            prefix += '0';
        }
        return prefix + dex;
    }

    private readonly handleChangeLevel = (event : React.ChangeEvent<HTMLInputElement>) => {
        const raw = event.currentTarget.value;
        const value = parseFloat(raw);

        this.setState({ form: { level: '' } });
        if (raw === '' + value && value >= this.MIN_LEVEL && value <= this.MAX_LEVEL && value % 0.5 === 0) {
            this.props.handleChangeIndividualValue('level', value);
        } else if (raw === '') {
            this.props.handleChangeIndividualValue('level', null);
        } else if (raw.charAt(raw.length) === '.') {
            this.setState({ form: { level: raw } });
        }
    }

    private readonly handleChangeIvFactory = (type : IndividualValueKey) => {
        return (event : React.ChangeEvent<HTMLInputElement>) => {
            const raw = event.currentTarget.value;
            const value = parseInt(raw, 10);
            if (raw === '' + value && value >= this.MIN_IV && value <= this.MAX_IV) {
                this.props.handleChangeIndividualValue(type, value);
            } else if (raw === '') {
                this.props.handleChangeIndividualValue(type, null);
            }
        };
    }

    private readonly handleActivateLeagueStats = (stats : IStats) => {
        const { handleChangeIndividualValue } = this.props;

        handleChangeIndividualValue('level', stats.level);
        handleChangeIndividualValue('hp', stats.ivHp);
        handleChangeIndividualValue('atk', stats.ivAtk);
        handleChangeIndividualValue('def', stats.ivDef);
    }
}
