/* jslint node: true */
'use strict';

//  ENiGMA½
const events            = require('events');
const util              = require('util');
const ansi              = require('./ansi_term.js');
const colorCodes        = require('./color_codes.js');
const enigAssert        = require('./enigma_assert.js');
const { renderSubstr }  = require('./string_util.js');

//  deps
const _             = require('lodash');

exports.View                            = View;

const VIEW_SPECIAL_KEY_MAP_DEFAULT = {
    accept      : [ 'return' ],
    exit        : [ 'esc' ],
    backspace   : [ 'backspace', 'del', 'ctrl + d'],    //  https://www.tecmint.com/linux-command-line-bash-shortcut-keys/
    del         : [ 'del' ],
    next        : [ 'tab' ],
    up          : [ 'up arrow' ],
    down        : [ 'down arrow' ],
    end         : [ 'end' ],
    home        : [ 'home' ],
    left        : [ 'left arrow' ],
    right       : [ 'right arrow' ],
    clearLine   : [ 'ctrl + y' ],
};

exports.VIEW_SPECIAL_KEY_MAP_DEFAULT    = VIEW_SPECIAL_KEY_MAP_DEFAULT;

function View(options) {
    events.EventEmitter.call(this);

    enigAssert(_.isObject(options));
    enigAssert(_.isObject(options.client));

    this.client             = options.client;
    this.cursor             = options.cursor || 'show';
    this.cursorStyle        = options.cursorStyle || 'default';

    this.acceptsFocus       = options.acceptsFocus || false;
    this.acceptsInput       = options.acceptsInput || false;
    this.autoAdjustHeight = _.get(options, 'dimens.height') ? false : _.get(options, 'autoAdjustHeight', true);
    this.position           = { x : 0, y : 0 };
    this.textStyle          = options.textStyle || 'normal';
    this.focusTextStyle     = options.focusTextStyle || this.textStyle;

    if(options.id) {
        this.setId(options.id);
    }

    if(options.position) {
        this.setPosition(options.position);
    }

    if(options.dimens) {
        this.setDimension(options.dimens);
    } else {
        this.dimens = {
            width   : options.width || 0,
            height  : 0
        };
    }

    //  :TODO: Just use styleSGRx for these, e.g. styleSGR0, styleSGR1 = norm/focus
    this.ansiSGR        = options.ansiSGR || ansi.getSGRFromGraphicRendition( { fg : 39, bg : 49 }, true);
    this.ansiFocusSGR   = options.ansiFocusSGR || this.ansiSGR;

    this.styleSGR1      = options.styleSGR1 || this.ansiSGR;
    this.styleSGR2      = options.styleSGR2 || this.ansiFocusSGR;

    if(this.acceptsInput) {
        this.specialKeyMap = options.specialKeyMap || VIEW_SPECIAL_KEY_MAP_DEFAULT;

        if(_.isObject(options.specialKeyMapOverride)) {
            this.setSpecialKeyMapOverride(options.specialKeyMapOverride);
        }
    }

    this.isKeyMapped = function(keySet, keyName) {
        return _.has(this.specialKeyMap, keySet) && this.specialKeyMap[keySet].indexOf(keyName) > -1;
    };

    this.getANSIColor = function(color) {
        var sgr = [ color.flags, color.fg ];
        if(color.bg !== color.flags) {
            sgr.push(color.bg);
        }
        return ansi.sgr(sgr);
    };

    this.hideCusor = function() {
        this.client.term.rawWrite(ansi.hideCursor());
    };

    this.restoreCursor = function() {
        //this.client.term.write(ansi.setCursorStyle(this.cursorStyle));
        this.client.term.rawWrite('show' === this.cursor ? ansi.showCursor() : ansi.hideCursor());
    };

    this.initDefaultWidth = function(width = 15) {
        this.dimens.width = this.dimens.width || Math.min(width, this.client.term.termWidth - this.position.col);
    };
}

util.inherits(View, events.EventEmitter);

View.prototype.setId = function(id) {
    this.id = id;
};

View.prototype.getId = function() {
    return this.id;
};

View.prototype.setPosition = function(pos) {
    //
    //  Allow the following forms: [row, col], { row : r, col : c }, or (row, col)
    //
    if(Array.isArray(pos)) {
        this.position.row = pos[0];
        this.position.col = pos[1];
    } else if(_.isNumber(pos.row) && _.isNumber(pos.col)) {
        this.position.row = pos.row;
        this.position.col = pos.col;
    } else if(2 === arguments.length) {
        this.position.row = parseInt(arguments[0], 10);
        this.position.col = parseInt(arguments[1], 10);
    }

    //  sanatize
    this.position.row   = Math.max(this.position.row, 1);
    this.position.col   = Math.max(this.position.col, 1);
    this.position.row   = Math.min(this.position.row, this.client.term.termHeight);
    this.position.col   = Math.min(this.position.col, this.client.term.termWidth);
};

View.prototype.setDimension = function(dimens) {
    enigAssert(_.isObject(dimens) && _.isNumber(dimens.height) && _.isNumber(dimens.width));
    this.dimens = dimens;
    this.autoAdjustHeight = false;
};

View.prototype.setHeight = function(height) {
    height  = parseInt(height) || 1;
    height  = Math.min(height, this.client.term.termHeight);

    this.dimens.height = height;
    this.autoAdjustHeight = false;
};

View.prototype.setWidth = function(width) {
    width   = parseInt(width) || 1;
    width   = Math.min(width, this.client.term.termWidth - this.position.col);

    this.dimens.width = width;
};

View.prototype.getSGR = function() {
    return this.ansiSGR;
};

View.prototype.getStyleSGR = function(n) {
    n = parseInt(n) || 0;
    return this['styleSGR' + n];
};

View.prototype.getFocusSGR = function() {
    return this.ansiFocusSGR;
};

View.prototype.setSpecialKeyMapOverride = function(specialKeyMapOverride) {
    this.specialKeyMap = Object.assign(this.specialKeyMap, specialKeyMapOverride);
};

View.prototype.setPropertyValue = function(propName, value) {
    switch(propName) {
        case 'acceptsFocus' :
            if (_.isBoolean(value)) {
                this.acceptsFocus = value;
            }
            break;

        case 'height'   : this.setHeight(value); break;
        case 'width'    : this.setWidth(value); break;
        case 'focus'    : this.setFocusProperty(value); break;

        case 'text'     :
            if('setText' in this) {
                this.setText(value);
            }
            break;

        case 'textStyle'        : this.textStyle = value; break;
        case 'focusTextStyle'   : this.focusTextStyle = value; break;

        case 'justify'  : this.justify = value; break;

        case 'fillChar' :
            if('fillChar' in this) {
                if(_.isNumber(value)) {
                    this.fillChar = String.fromCharCode(value);
                } else if(_.isString(value)) {
                    this.fillChar = renderSubstr(value, 0, 1);
                }
            }
            break;

        case 'submit' :
            if(_.isBoolean(value)) {
                this.submit = value;
            }/* else {
                this.submit = _.isArray(value) && value.length > 0;
            }
            */
            break;

        case 'resizable' :
            if(_.isBoolean(value)) {
                this.resizable = value;
            }
            break;

        case 'argName' : this.submitArgName = value; break;

        case 'omit' :
            if(_.isBoolean(value)) {
                this.omitFromSubmission = value; break;
            }
            break;

        case 'validate' :
            if(_.isFunction(value)) {
                this.validate = value;
            }
            break;
    }

    if(/styleSGR[0-9]{1,2}/.test(propName)) {
        if(_.isObject(value)) {
            this[propName] = ansi.getSGRFromGraphicRendition(value, true);
        } else if(_.isString(value)) {
            this[propName] = colorCodes.pipeToAnsi(value);
        }
    }
};

View.prototype.redraw = function() {
    this.client.term.write(ansi.goto(this.position.row, this.position.col));
};

View.prototype.setFocusProperty = function(focused) {
    // Either this should accept focus, or the focus should be false
    enigAssert(this.acceptsFocus || !focused, 'View does not accept focus');
    this.hasFocus = focused;
};

View.prototype.setFocus = function(focused) {
    // Call separate method to differentiate between a value set as a
    // property vs focus programmatically called.
    this.setFocusProperty(focused);
    this.restoreCursor();
};

View.prototype.onKeyPress = function(ch, key) {
    enigAssert(this.hasFocus,       'View does not have focus');
    enigAssert(this.acceptsInput,   'View does not accept input');

    if(!this.hasFocus || !this.acceptsInput) {
        return;
    }

    if(key) {
        enigAssert(this.specialKeyMap, 'No special key map defined');

        if(this.isKeyMapped('accept', key.name)) {
            this.emit('action', 'accept', key);
        } else if(this.isKeyMapped('next', key.name)) {
            this.emit('action', 'next', key);
        }
    }

    if(ch) {
        enigAssert(1 === ch.length);
    }

    this.emit('key press', ch, key);
};

View.prototype.getData = function() {
};