'use strict';
const ansiStyles = require('ansi-styles');
const {stdout: stdoutColor, stderr: stderrColor} = require('supports-color');
const {
    stringReplaceAll,
    stringEncaseCRLFWithFirstIndex
} = require('./util');

const {isArray} = Array;

// `supportsColor.level` → `ansiStyles.color[name]` mapping
const levelMapping = [
    'ansi',
    'ansi',
    'ansi256',
    'ansi16m'
];

const styles = Object.create(null);

const applyOptions = (object, options = {}) => {
    if (options.level && !(Number.isInteger(options.level) && options.level >= 0 && options.level <= 3)) {
        throw new Error('The `level` option should be an integer from 0 to 3');
    }

    // Detect level if not set manually
    const colorLevel = stdoutColor ? stdoutColor.level : 0;
    object.level = options.level === undefined ? colorLevel : options.level;
};

class ChalkClass {
    constructor(options) {
        // eslint-disable-next-line no-constructor-return
        return chalkFactory(options);
    }
}

const chalkFactory = options => {
    const chalk = {};
    applyOptions(chalk, options);

    chalk.template = (...arguments_) => chalkTag(chalk.template, ...arguments_);

    Object.setPrototypeOf(chalk, Chalk.prototype);
    Object.setPrototypeOf(chalk.template, chalk);

    chalk.template.constructor = () => {
        throw new Error('`chalk.constructor()` is deprecated. Use `new chalk.Instance()` instead.');
    };

    chalk.template.Instance = ChalkClass;

    return chalk.template;
};

function Chalk(options) {
    return chalkFactory(options);
}

for (const [styleName, style] of Object.entries(ansiStyles)) {
    styles[styleName] = {
        get() {
            const builder = createBuilder(this, createStyler(style.open, style.close, this._styler), this._isEmpty);
            Object.defineProperty(this, styleName, {value: builder});
            return builder;
        }
    };
}

styles.visible = {
    get() {
        const builder = createBuilder(this, this._styler, true);
        Object.defineProperty(this, 'visible', {value: builder});
        return builder;
    }
};

const usedModels = ['rgb', 'hex', 'keyword', 'hsl', 'hsv', 'hwb', 'ansi', 'ansi256'];

for (const model of usedModels) {
    styles[model] = {
        get() {
            const {level} = this;
            return function (...arguments_) {
                const styler = createStyler(ansiStyles.color[levelMapping[level]][model](...arguments_), ansiStyles.color.close, this._styler);
                return createBuilder(this, styler, this._isEmpty);
            };
        }
    };
}

for (const model of usedModels) {
    const bgModel = 'bg' + model[0].toUpperCase() + model.slice(1);
    styles[bgModel] = {
        get() {
            const {level} = this;
            return function (...arguments_) {
                const styler = createStyler(ansiStyles.bgColor[levelMapping[level]][model](...arguments_), ansiStyles.bgColor.close, this._styler);
                return createBuilder(this, styler, this._isEmpty);
            };
        }
    };
}

const proto = Object.defineProperties(() => {}, {
    ...styles,
    level: {
        enumerable: true,
        get() {
            return this._generator.level;
        },
        set(level) {
            this._generator.level = level;
        }
    }
});

const createStyler = (open, close, parent) => {
    let openAll;
    let closeAll;
    if (parent === undefined) {
        openAll = open;
        closeAll = close;
    } else {
        openAll = parent.openAll + open;
        closeAll = close + parent.closeAll;
    }

    return {
        open,
        close,
        openAll,
        closeAll,
        parent
    };
};

const createBuilder = (self, _styler, _isEmpty) => {
    const builder = (...arguments_) => {
        if (isArray(arguments_[0]) && isArray(arguments_[0].raw)) {
            // Called as a template literal, for example: chalk.red`2 + 3 = {bold ${2+3}}`
            return applyStyle(builder, chalkTag(builder, ...arguments_));
        }

        // Single argument is hot path, implicit coercion is faster than anything
        // eslint-disable-next-line no-implicit-coercion
        return applyStyle(builder, (arguments_.length === 1) ? ('' + arguments_[0]) : arguments_.join(' '));
    };

    // We alter the prototype because we must return a function, but there is
    // no way to create a function with a different prototype
    Object.setPrototypeOf(builder, proto);

    builder._generator = self;
    builder._styler = _styler;
    builder._isEmpty = _isEmpty;

    return builder;
};

const applyStyle = (self, string) => {
    if (self.level <= 0 || !string) {
        return self._isEmpty ? '' : string;
    }

    let styler = self._styler;

    if (styler === undefined) {
        return string;
    }

    const {openAll, closeAll} = styler;
    if (string.indexOf('\u001B') !== -1) {
        while (styler !== undefined) {
            // Replace any instances already present with a re-opening code
            // otherwise only the part of the string until said closing code
            // will be colored, and the rest will simply be 'plain'.
            string = stringReplaceAll(string, styler.close, styler.open);

            styler = styler.parent;
        }
    }

    // We can move both next actions out of loop, because remaining actions in loop won't have
    // any/visible effect on parts we add here. Close the styling before a linebreak and reopen
    // after next line to fix a bleed issue on macOS: https://github.com/chalk/chalk/pull/92
    const lfIndex = string.indexOf('\n');
    if (lfIndex !== -1) {
        string = stringEncaseCRLFWithFirstIndex(string, closeAll, openAll, lfIndex);
    }

    return openAll + string + closeAll;
};

let template;
const chalkTag = (chalk, ...strings) => {
    const [firstString] = strings;

    if (!isArray(firstString) || !isArray(firstString.raw)) {
        // If chalk() was called by itself or with a string,
        // return the string itself as a string.
        return strings.join(' ');
    }

    const arguments_ = strings.slice(1);
    const parts = [firstString.raw[0]];

    for (let i = 1; i < firstString.length; i++) {
        parts.push(
            String(arguments_[i - 1]).replace(/[{}\\]/g, '\\$&'),
            String(firstString.raw[i])
        );
    }

    if (template === undefined) {
        template = require('./templates');
    }

    return template(chalk, parts.join(''));
};

Object.defineProperties(Chalk.prototype, styles);

const chalk = Chalk(); // eslint-disable-line new-cap
chalk.supportsColor = stdoutColor;
chalk.stderr = Chalk({level: stderrColor ? stderrColor.level : 0}); // eslint-disable-line new-cap
chalk.stderr.supportsColor = stderrColor;

module.exports = chalk;