import { assertNotStrictEqual, } from './typings/common-types.js';
import { isPromise } from './utils/is-promise.js';
import { applyMiddleware, commandMiddlewareFactory, } from './middleware.js';
import { parseCommand } from './parse-command.js';
import { isYargsInstance, } from './yargs-factory.js';
import { maybeAsyncResult } from './utils/maybe-async-result.js';
import whichModule from './utils/which-module.js';
const DEFAULT_MARKER = /(^\*)|(^\$0)/;
export class CommandInstance {
    constructor(usage, validation, globalMiddleware, shim) {
        this.requireCache = new Set();
        this.handlers = {};
        this.aliasMap = {};
        this.frozens = [];
        this.shim = shim;
        this.usage = usage;
        this.globalMiddleware = globalMiddleware;
        this.validation = validation;
    }
    addDirectory(dir, req, callerFile, opts) {
        opts = opts || {};
        if (typeof opts.recurse !== 'boolean')
            opts.recurse = false;
        if (!Array.isArray(opts.extensions))
            opts.extensions = ['js'];
        const parentVisit = typeof opts.visit === 'function' ? opts.visit : (o) => o;
        opts.visit = (obj, joined, filename) => {
            const visited = parentVisit(obj, joined, filename);
            if (visited) {
                if (this.requireCache.has(joined))
                    return visited;
                else
                    this.requireCache.add(joined);
                this.addHandler(visited);
            }
            return visited;
        };
        this.shim.requireDirectory({ require: req, filename: callerFile }, dir, opts);
    }
    addHandler(cmd, description, builder, handler, commandMiddleware, deprecated) {
        let aliases = [];
        const middlewares = commandMiddlewareFactory(commandMiddleware);
        handler = handler || (() => { });
        if (Array.isArray(cmd)) {
            if (isCommandAndAliases(cmd)) {
                [cmd, ...aliases] = cmd;
            }
            else {
                for (const command of cmd) {
                    this.addHandler(command);
                }
            }
        }
        else if (isCommandHandlerDefinition(cmd)) {
            let command = Array.isArray(cmd.command) || typeof cmd.command === 'string'
                ? cmd.command
                : this.moduleName(cmd);
            if (cmd.aliases)
                command = [].concat(command).concat(cmd.aliases);
            this.addHandler(command, this.extractDesc(cmd), cmd.builder, cmd.handler, cmd.middlewares, cmd.deprecated);
            return;
        }
        else if (isCommandBuilderDefinition(builder)) {
            this.addHandler([cmd].concat(aliases), description, builder.builder, builder.handler, builder.middlewares, builder.deprecated);
            return;
        }
        if (typeof cmd === 'string') {
            const parsedCommand = parseCommand(cmd);
            aliases = aliases.map(alias => parseCommand(alias).cmd);
            let isDefault = false;
            const parsedAliases = [parsedCommand.cmd].concat(aliases).filter(c => {
                if (DEFAULT_MARKER.test(c)) {
                    isDefault = true;
                    return false;
                }
                return true;
            });
            if (parsedAliases.length === 0 && isDefault)
                parsedAliases.push('$0');
            if (isDefault) {
                parsedCommand.cmd = parsedAliases[0];
                aliases = parsedAliases.slice(1);
                cmd = cmd.replace(DEFAULT_MARKER, parsedCommand.cmd);
            }
            aliases.forEach(alias => {
                this.aliasMap[alias] = parsedCommand.cmd;
            });
            if (description !== false) {
                this.usage.command(cmd, description, isDefault, aliases, deprecated);
            }
            this.handlers[parsedCommand.cmd] = {
                original: cmd,
                description,
                handler,
                builder: builder || {},
                middlewares,
                deprecated,
                demanded: parsedCommand.demanded,
                optional: parsedCommand.optional,
            };
            if (isDefault)
                this.defaultCommand = this.handlers[parsedCommand.cmd];
        }
    }
    getCommandHandlers() {
        return this.handlers;
    }
    getCommands() {
        return Object.keys(this.handlers).concat(Object.keys(this.aliasMap));
    }
    hasDefaultCommand() {
        return !!this.defaultCommand;
    }
    runCommand(command, yargs, parsed, commandIndex, helpOnly, helpOrVersionSet) {
        const commandHandler = this.handlers[command] ||
            this.handlers[this.aliasMap[command]] ||
            this.defaultCommand;
        const currentContext = yargs.getInternalMethods().getContext();
        const parentCommands = currentContext.commands.slice();
        const isDefaultCommand = !command;
        if (command) {
            currentContext.commands.push(command);
            currentContext.fullCommands.push(commandHandler.original);
        }
        const builderResult = this.applyBuilderUpdateUsageAndParse(isDefaultCommand, commandHandler, yargs, parsed.aliases, parentCommands, commandIndex, helpOnly, helpOrVersionSet);
        return isPromise(builderResult)
            ? builderResult.then(result => this.applyMiddlewareAndGetResult(isDefaultCommand, commandHandler, result.innerArgv, currentContext, helpOnly, result.aliases, yargs))
            : this.applyMiddlewareAndGetResult(isDefaultCommand, commandHandler, builderResult.innerArgv, currentContext, helpOnly, builderResult.aliases, yargs);
    }
    applyBuilderUpdateUsageAndParse(isDefaultCommand, commandHandler, yargs, aliases, parentCommands, commandIndex, helpOnly, helpOrVersionSet) {
        const builder = commandHandler.builder;
        let innerYargs = yargs;
        if (isCommandBuilderCallback(builder)) {
            const builderOutput = builder(yargs.getInternalMethods().reset(aliases), helpOrVersionSet);
            if (isPromise(builderOutput)) {
                return builderOutput.then(output => {
                    innerYargs = isYargsInstance(output) ? output : yargs;
                    return this.parseAndUpdateUsage(isDefaultCommand, commandHandler, innerYargs, parentCommands, commandIndex, helpOnly);
                });
            }
        }
        else if (isCommandBuilderOptionDefinitions(builder)) {
            innerYargs = yargs.getInternalMethods().reset(aliases);
            Object.keys(commandHandler.builder).forEach(key => {
                innerYargs.option(key, builder[key]);
            });
        }
        return this.parseAndUpdateUsage(isDefaultCommand, commandHandler, innerYargs, parentCommands, commandIndex, helpOnly);
    }
    parseAndUpdateUsage(isDefaultCommand, commandHandler, innerYargs, parentCommands, commandIndex, helpOnly) {
        if (isDefaultCommand)
            innerYargs.getInternalMethods().getUsageInstance().unfreeze(true);
        if (this.shouldUpdateUsage(innerYargs)) {
            innerYargs
                .getInternalMethods()
                .getUsageInstance()
                .usage(this.usageFromParentCommandsCommandHandler(parentCommands, commandHandler), commandHandler.description);
        }
        const innerArgv = innerYargs
            .getInternalMethods()
            .runYargsParserAndExecuteCommands(null, undefined, true, commandIndex, helpOnly);
        return isPromise(innerArgv)
            ? innerArgv.then(argv => ({
                aliases: innerYargs.parsed.aliases,
                innerArgv: argv,
            }))
            : {
                aliases: innerYargs.parsed.aliases,
                innerArgv: innerArgv,
            };
    }
    shouldUpdateUsage(yargs) {
        return (!yargs.getInternalMethods().getUsageInstance().getUsageDisabled() &&
            yargs.getInternalMethods().getUsageInstance().getUsage().length === 0);
    }
    usageFromParentCommandsCommandHandler(parentCommands, commandHandler) {
        const c = DEFAULT_MARKER.test(commandHandler.original)
            ? commandHandler.original.replace(DEFAULT_MARKER, '').trim()
            : commandHandler.original;
        const pc = parentCommands.filter(c => {
            return !DEFAULT_MARKER.test(c);
        });
        pc.push(c);
        return `$0 ${pc.join(' ')}`;
    }
    applyMiddlewareAndGetResult(isDefaultCommand, commandHandler, innerArgv, currentContext, helpOnly, aliases, yargs) {
        let positionalMap = {};
        if (helpOnly)
            return innerArgv;
        if (!yargs.getInternalMethods().getHasOutput()) {
            positionalMap = this.populatePositionals(commandHandler, innerArgv, currentContext, yargs);
        }
        const middlewares = this.globalMiddleware
            .getMiddleware()
            .slice(0)
            .concat(commandHandler.middlewares);
        innerArgv = applyMiddleware(innerArgv, yargs, middlewares, true);
        if (!yargs.getInternalMethods().getHasOutput()) {
            const validation = yargs
                .getInternalMethods()
                .runValidation(aliases, positionalMap, yargs.parsed.error, isDefaultCommand);
            innerArgv = maybeAsyncResult(innerArgv, result => {
                validation(result);
                return result;
            });
        }
        if (commandHandler.handler && !yargs.getInternalMethods().getHasOutput()) {
            yargs.getInternalMethods().setHasOutput();
            const populateDoubleDash = !!yargs.getOptions().configuration['populate--'];
            yargs
                .getInternalMethods()
                .postProcess(innerArgv, populateDoubleDash, false, false);
            innerArgv = applyMiddleware(innerArgv, yargs, middlewares, false);
            innerArgv = maybeAsyncResult(innerArgv, result => {
                const handlerResult = commandHandler.handler(result);
                return isPromise(handlerResult)
                    ? handlerResult.then(() => result)
                    : result;
            });
            if (!isDefaultCommand) {
                yargs.getInternalMethods().getUsageInstance().cacheHelpMessage();
            }
            if (isPromise(innerArgv) &&
                !yargs.getInternalMethods().hasParseCallback()) {
                innerArgv.catch(error => {
                    try {
                        yargs.getInternalMethods().getUsageInstance().fail(null, error);
                    }
                    catch (_err) {
                    }
                });
            }
        }
        if (!isDefaultCommand) {
            currentContext.commands.pop();
            currentContext.fullCommands.pop();
        }
        return innerArgv;
    }
    populatePositionals(commandHandler, argv, context, yargs) {
        argv._ = argv._.slice(context.commands.length);
        const demanded = commandHandler.demanded.slice(0);
        const optional = commandHandler.optional.slice(0);
        const positionalMap = {};
        this.validation.positionalCount(demanded.length, argv._.length);
        while (demanded.length) {
            const demand = demanded.shift();
            this.populatePositional(demand, argv, positionalMap);
        }
        while (optional.length) {
            const maybe = optional.shift();
            this.populatePositional(maybe, argv, positionalMap);
        }
        argv._ = context.commands.concat(argv._.map(a => '' + a));
        this.postProcessPositionals(argv, positionalMap, this.cmdToParseOptions(commandHandler.original), yargs);
        return positionalMap;
    }
    populatePositional(positional, argv, positionalMap) {
        const cmd = positional.cmd[0];
        if (positional.variadic) {
            positionalMap[cmd] = argv._.splice(0).map(String);
        }
        else {
            if (argv._.length)
                positionalMap[cmd] = [String(argv._.shift())];
        }
    }
    cmdToParseOptions(cmdString) {
        const parseOptions = {
            array: [],
            default: {},
            alias: {},
            demand: {},
        };
        const parsed = parseCommand(cmdString);
        parsed.demanded.forEach(d => {
            const [cmd, ...aliases] = d.cmd;
            if (d.variadic) {
                parseOptions.array.push(cmd);
                parseOptions.default[cmd] = [];
            }
            parseOptions.alias[cmd] = aliases;
            parseOptions.demand[cmd] = true;
        });
        parsed.optional.forEach(o => {
            const [cmd, ...aliases] = o.cmd;
            if (o.variadic) {
                parseOptions.array.push(cmd);
                parseOptions.default[cmd] = [];
            }
            parseOptions.alias[cmd] = aliases;
        });
        return parseOptions;
    }
    postProcessPositionals(argv, positionalMap, parseOptions, yargs) {
        const options = Object.assign({}, yargs.getOptions());
        options.default = Object.assign(parseOptions.default, options.default);
        for (const key of Object.keys(parseOptions.alias)) {
            options.alias[key] = (options.alias[key] || []).concat(parseOptions.alias[key]);
        }
        options.array = options.array.concat(parseOptions.array);
        options.config = {};
        const unparsed = [];
        Object.keys(positionalMap).forEach(key => {
            positionalMap[key].map(value => {
                if (options.configuration['unknown-options-as-args'])
                    options.key[key] = true;
                unparsed.push(`--${key}`);
                unparsed.push(value);
            });
        });
        if (!unparsed.length)
            return;
        const config = Object.assign({}, options.configuration, {
            'populate--': false,
        });
        const parsed = this.shim.Parser.detailed(unparsed, Object.assign({}, options, {
            configuration: config,
        }));
        if (parsed.error) {
            yargs
                .getInternalMethods()
                .getUsageInstance()
                .fail(parsed.error.message, parsed.error);
        }
        else {
            const positionalKeys = Object.keys(positionalMap);
            Object.keys(positionalMap).forEach(key => {
                positionalKeys.push(...parsed.aliases[key]);
            });
            const defaults = yargs.getOptions().default;
            Object.keys(parsed.argv).forEach(key => {
                if (positionalKeys.includes(key)) {
                    if (!positionalMap[key])
                        positionalMap[key] = parsed.argv[key];
                    if (!Object.hasOwnProperty.call(defaults, key) &&
                        Object.hasOwnProperty.call(argv, key) &&
                        Object.hasOwnProperty.call(parsed.argv, key) &&
                        (Array.isArray(argv[key]) || Array.isArray(parsed.argv[key]))) {
                        argv[key] = [].concat(argv[key], parsed.argv[key]);
                    }
                    else {
                        argv[key] = parsed.argv[key];
                    }
                }
            });
        }
    }
    runDefaultBuilderOn(yargs) {
        if (!this.defaultCommand)
            return;
        if (this.shouldUpdateUsage(yargs)) {
            const commandString = DEFAULT_MARKER.test(this.defaultCommand.original)
                ? this.defaultCommand.original
                : this.defaultCommand.original.replace(/^[^[\]<>]*/, '$0 ');
            yargs
                .getInternalMethods()
                .getUsageInstance()
                .usage(commandString, this.defaultCommand.description);
        }
        const builder = this.defaultCommand.builder;
        if (isCommandBuilderCallback(builder)) {
            return builder(yargs, true);
        }
        else if (!isCommandBuilderDefinition(builder)) {
            Object.keys(builder).forEach(key => {
                yargs.option(key, builder[key]);
            });
        }
        return undefined;
    }
    moduleName(obj) {
        const mod = whichModule(obj);
        if (!mod)
            throw new Error(`No command name given for module: ${this.shim.inspect(obj)}`);
        return this.commandFromFilename(mod.filename);
    }
    commandFromFilename(filename) {
        return this.shim.path.basename(filename, this.shim.path.extname(filename));
    }
    extractDesc({ describe, description, desc }) {
        for (const test of [describe, description, desc]) {
            if (typeof test === 'string' || test === false)
                return test;
            assertNotStrictEqual(test, true, this.shim);
        }
        return false;
    }
    freeze() {
        this.frozens.push({
            handlers: this.handlers,
            aliasMap: this.aliasMap,
            defaultCommand: this.defaultCommand,
        });
    }
    unfreeze() {
        const frozen = this.frozens.pop();
        assertNotStrictEqual(frozen, undefined, this.shim);
        ({
            handlers: this.handlers,
            aliasMap: this.aliasMap,
            defaultCommand: this.defaultCommand,
        } = frozen);
    }
    reset() {
        this.handlers = {};
        this.aliasMap = {};
        this.defaultCommand = undefined;
        this.requireCache = new Set();
        return this;
    }
}
export function command(usage, validation, globalMiddleware, shim) {
    return new CommandInstance(usage, validation, globalMiddleware, shim);
}
export function isCommandBuilderDefinition(builder) {
    return (typeof builder === 'object' &&
        !!builder.builder &&
        typeof builder.handler === 'function');
}
function isCommandAndAliases(cmd) {
    return cmd.every(c => typeof c === 'string');
}
export function isCommandBuilderCallback(builder) {
    return typeof builder === 'function';
}
function isCommandBuilderOptionDefinitions(builder) {
    return typeof builder === 'object';
}
export function isCommandHandlerDefinition(cmd) {
    return typeof cmd === 'object' && !Array.isArray(cmd);
}
