// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

// Depends on jshint.js from https://github.com/jshint/jshint

;(function (mod) {
    if (typeof exports == 'object' && typeof module == 'object')
        // CommonJS
        mod(require('../../lib/codemirror'))
    else if (typeof define == 'function' && define.amd)
        // AMD
        define(['../../lib/codemirror'], mod)
    // Plain browser env
    else mod(CodeMirror)
})(function (CodeMirror) {
    'use strict'
    // declare global: JSHINT

    function validator(text, options) {
        if (!window.JSHINT) {
            if (window.console) {
                window.console.error('Error: window.JSHINT not defined, CodeMirror JavaScript linting cannot run.')
            }
            return []
        }
        if (!options.indent)
            // JSHint error.character actually is a column index, this fixes underlining on lines using tabs for indentation
            options.indent = 1 // JSHint default value is 4
        JSHINT(text, options, options.globals)
        var errors = JSHINT.data().errors,
            result = []
        if (errors) parseErrors(errors, result)
        return result
    }

    CodeMirror.registerHelper('lint', 'javascript', validator)

    function parseErrors(errors, output) {
        for (var i = 0; i < errors.length; i++) {
            var error = errors[i]
            if (error) {
                if (error.line <= 0) {
                    if (window.console) {
                        window.console.warn('Cannot display JSHint error (invalid line ' + error.line + ')', error)
                    }
                    continue
                }

                var start = error.character - 1,
                    end = start + 1
                if (error.evidence) {
                    var index = error.evidence.substring(start).search(/.\b/)
                    if (index > -1) {
                        end += index
                    }
                }

                // Convert to format expected by validation service
                var hint = {
                    message: error.reason,
                    severity: error.code ? (error.code.startsWith('W') ? 'warning' : 'error') : 'error',
                    from: CodeMirror.Pos(error.line - 1, start),
                    to: CodeMirror.Pos(error.line - 1, end),
                }

                output.push(hint)
            }
        }
    }
})