'use strict';

const { clone } = require('@hapi/hoek');

const Common = require('./common');


const internals = {
    annotations: Symbol('annotations')
};


exports.error = function (stripColorCodes) {

    if (!this._original ||
        typeof this._original !== 'object') {

        return this.details[0].message;
    }

    const redFgEscape = stripColorCodes ? '' : '\u001b[31m';
    const redBgEscape = stripColorCodes ? '' : '\u001b[41m';
    const endColor = stripColorCodes ? '' : '\u001b[0m';

    const obj = clone(this._original);

    for (let i = this.details.length - 1; i >= 0; --i) {        // Reverse order to process deepest child first
        const pos = i + 1;
        const error = this.details[i];
        const path = error.path;
        let node = obj;
        for (let j = 0; ; ++j) {
            const seg = path[j];

            if (Common.isSchema(node)) {
                node = node.clone();                              // joi schemas are not cloned by hoek, we have to take this extra step
            }

            if (j + 1 < path.length &&
                typeof node[seg] !== 'string') {

                node = node[seg];
            }
            else {
                const refAnnotations = node[internals.annotations] || { errors: {}, missing: {} };
                node[internals.annotations] = refAnnotations;

                const cacheKey = seg || error.context.key;

                if (node[seg] !== undefined) {
                    refAnnotations.errors[cacheKey] = refAnnotations.errors[cacheKey] || [];
                    refAnnotations.errors[cacheKey].push(pos);
                }
                else {
                    refAnnotations.missing[cacheKey] = pos;
                }

                break;
            }
        }
    }

    const replacers = {
        key: /_\$key\$_([, \d]+)_\$end\$_"/g,
        missing: /"_\$miss\$_([^|]+)\|(\d+)_\$end\$_": "__missing__"/g,
        arrayIndex: /\s*"_\$idx\$_([, \d]+)_\$end\$_",?\n(.*)/g,
        specials: /"\[(NaN|Symbol.*|-?Infinity|function.*|\(.*)]"/g
    };

    let message = internals.safeStringify(obj, 2)
        .replace(replacers.key, ($0, $1) => `" ${redFgEscape}[${$1}]${endColor}`)
        .replace(replacers.missing, ($0, $1, $2) => `${redBgEscape}"${$1}"${endColor}${redFgEscape} [${$2}]: -- missing --${endColor}`)
        .replace(replacers.arrayIndex, ($0, $1, $2) => `\n${$2} ${redFgEscape}[${$1}]${endColor}`)
        .replace(replacers.specials, ($0, $1) => $1);

    message = `${message}\n${redFgEscape}`;

    for (let i = 0; i < this.details.length; ++i) {
        const pos = i + 1;
        message = `${message}\n[${pos}] ${this.details[i].message}`;
    }

    message = message + endColor;

    return message;
};


// Inspired by json-stringify-safe

internals.safeStringify = function (obj, spaces) {

    return JSON.stringify(obj, internals.serializer(), spaces);
};


internals.serializer = function () {

    const keys = [];
    const stack = [];

    const cycleReplacer = (key, value) => {

        if (stack[0] === value) {
            return '[Circular ~]';
        }

        return '[Circular ~.' + keys.slice(0, stack.indexOf(value)).join('.') + ']';
    };

    return function (key, value) {

        if (stack.length > 0) {
            const thisPos = stack.indexOf(this);
            if (~thisPos) {
                stack.length = thisPos + 1;
                keys.length = thisPos + 1;
                keys[thisPos] = key;
            }
            else {
                stack.push(this);
                keys.push(key);
            }

            if (~stack.indexOf(value)) {
                value = cycleReplacer.call(this, key, value);
            }
        }
        else {
            stack.push(value);
        }

        if (value) {
            const annotations = value[internals.annotations];
            if (annotations) {
                if (Array.isArray(value)) {
                    const annotated = [];

                    for (let i = 0; i < value.length; ++i) {
                        if (annotations.errors[i]) {
                            annotated.push(`_$idx$_${annotations.errors[i].sort().join(', ')}_$end$_`);
                        }

                        annotated.push(value[i]);
                    }

                    value = annotated;
                }
                else {
                    for (const errorKey in annotations.errors) {
                        value[`${errorKey}_$key$_${annotations.errors[errorKey].sort().join(', ')}_$end$_`] = value[errorKey];
                        value[errorKey] = undefined;
                    }

                    for (const missingKey in annotations.missing) {
                        value[`_$miss$_${missingKey}|${annotations.missing[missingKey]}_$end$_`] = '__missing__';
                    }
                }

                return value;
            }
        }

        if (value === Infinity ||
            value === -Infinity ||
            Number.isNaN(value) ||
            typeof value === 'function' ||
            typeof value === 'symbol') {

            return '[' + value.toString() + ']';
        }

        return value;
    };
};
