import * as _ from 'lodash';

import {
    ContractDocs,
    ContractKind,
    DocumentedItem,
    EnumDocs,
    EnumValueDocs,
    EventDocs,
    FunctionKind,
    MethodDocs,
    ParamDocs,
    ParamDocsMap,
    StateMutability,
    StorageLocation,
    StructDocs,
    Visibility,
} from '../../src/extract_docs';

// tslint:disable: custom-no-magic-numbers completed-docs
const LETTERS = _.times(26, n => String.fromCharCode('a'.charCodeAt(0) + n));

export function randomWord(maxLength: number = 13): string {
    return _.sampleSize(LETTERS, _.random(1, maxLength)).join('');
}

export function randomSentence(): string {
    const numWords = _.random(3, 64);
    return _.capitalize(
        _.times(numWords, () => randomWord())
            .join(' ')
            .concat('.'),
    );
}

export function randomDocs(): DocumentedItem {
    return {
        doc: randomSentence(),
        line: _.random(1, 65536),
        file: _.capitalize(randomWord()).concat('.sol'),
    };
}

export function randomBoolean(): boolean {
    return _.random(0, 1) === 1;
}

export function randomType(): string {
    return _.sampleSize(['uint256', 'bytes32', 'bool', 'uint32', 'int256', 'int64', 'uint8'], 1)[0];
}

export function randomStorageLocation(): StorageLocation {
    return _.sampleSize([StorageLocation.Default, StorageLocation.Memory, StorageLocation.Storage])[0];
}

export function randomContractKind(): ContractKind {
    return _.sampleSize([ContractKind.Contract, ContractKind.Interface, ContractKind.Library])[0];
}

export function randomMutability(): StateMutability {
    return _.sampleSize([
        StateMutability.Nonpayable,
        StateMutability.Payable,
        StateMutability.Pure,
        StateMutability.View,
    ])[0];
}

export function randomVisibility(): Visibility {
    return _.sampleSize([Visibility.External, Visibility.Internal, Visibility.Public, Visibility.Private])[0];
}

export function randomFunctionKind(): FunctionKind {
    return _.sampleSize([FunctionKind.Constructor, FunctionKind.Fallback, FunctionKind.Function])[0];
}

export function randomParameters(): ParamDocsMap {
    const numParams = _.random(0, 7);
    return _.zipObject(_.times(numParams, () => randomWord()), _.times(numParams, idx => randomParameter(idx)));
}

export function randomParameter(order: number, fields?: Partial<ParamDocs>): ParamDocs {
    return {
        ...randomDocs(),
        type: randomType(),
        indexed: randomBoolean(),
        storageLocation: randomStorageLocation(),
        order,
        ...fields,
    };
}

export function randomEvent(fields?: Partial<EventDocs>): EventDocs {
    return {
        ...randomDocs(),
        contract: `${randomWord()}Contract`,
        name: `${randomWord()}Event`,
        parameters: randomParameters(),
        ...fields,
    };
}

export function randomMethod(fields?: Partial<MethodDocs>): MethodDocs {
    return {
        ...randomDocs(),
        contract: `${randomWord()}Contract`,
        name: `${randomWord()}Method`,
        kind: randomFunctionKind(),
        isAccessor: randomBoolean(),
        stateMutability: randomMutability(),
        visibility: randomVisibility(),
        returns: randomParameters(),
        parameters: randomParameters(),
        ...fields,
    };
}

export function randomStruct(fields?: Partial<StructDocs>): StructDocs {
    return {
        ...randomDocs(),
        contract: `${randomWord()}Contract`,
        fields: randomParameters(),
        ...fields,
    };
}

export function randomEnum(fields?: Partial<EnumDocs>): EnumDocs {
    return {
        ...randomDocs(),
        contract: `${randomWord()}Contract`,
        values: _.mapValues(
            _.groupBy(
                _.times(_.random(1, 8), i => ({
                    ...randomDocs(),
                    value: i,
                    name: randomWord(),
                })),
                'name',
            ),
            v => (_.omit(v[0], 'name') as any) as EnumValueDocs,
        ),
        ...fields,
    };
}

export function randomContract(contractName: string, fields?: Partial<ContractDocs>): ContractDocs {
    return {
        ...randomDocs(),
        kind: randomContractKind(),
        inherits: [],
        events: _.times(_.random(1, 4), () => randomEvent({ contract: contractName })),
        methods: _.times(_.random(1, 4), () => randomMethod({ contract: contractName })),
        structs: _.mapValues(
            _.groupBy(
                _.times(_.random(1, 4), () => ({
                    ...randomStruct({ contract: contractName }),
                    name: `${randomWord()}Struct`,
                })),
                'name',
            ),
            v => (_.omit(v[0], 'name') as any) as StructDocs,
        ),
        enums: _.mapValues(
            _.groupBy(
                _.times(_.random(1, 4), () => ({
                    ...randomEnum({ contract: contractName }),
                    name: `${randomWord()}Enum`,
                })),
                'name',
            ),
            v => (_.omit(v[0], 'name') as any) as EnumDocs,
        ),
        ...fields,
    };
}