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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2014 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#import <stdio.h>
#import <stdlib.h>
#import <string.h>

#import "text.h"
#import "container.h"

@implementation TextChangeMgr

- (TextChangeMgr*)initWithValue:(UiText*)text context:(UiContext*)ctx {
    value = text;
    context = ctx;
    last_length = 0;
    return self;
}

- (NSUndoManager*)undoManagerForTextView:(NSTextView*)textview {
    return (NSUndoManager*)value->undomgr;
}

- (NSRange)textView:(NSTextView *)textview
       willChangeSelectionFromCharacterRange:(NSRange)oldrange
       toCharacterRange:(NSRange)newrange
{
    if(newrange.length != last_length) {
        if(newrange.length == 0) {
            ui_unset_group(context, UI_GROUP_SELECTION);
        } else {
            ui_set_group(context, UI_GROUP_SELECTION);
        }
    }
    
    last_length = newrange.length;
    return newrange;
}

@end


UIWIDGET ui_textarea(UiObject *obj, UiText *value) {
    UiContainer *ct = uic_get_current_container(obj);
    
    NSRect frame = ct->getframe(ct);
    
    NSScrollView *scrollview = [[NSScrollView alloc] initWithFrame:frame];
    [scrollview setHasVerticalScroller:YES];
    //[scrollvew setHasHorizontalScroller:YES];
    [scrollview setBorderType:NSNoBorder];
    //[scrollview setAutoresizingMask:NSViewWidthSizable|NSViewHeightSizable];
    
    //frame.size.width = frame.size.width - 15;
    NSTextView *textview = [[NSTextView alloc]initWithFrame:frame];
    [textview setAllowsUndo:TRUE];
    [textview setAutoresizingMask:NSViewWidthSizable|NSViewHeightSizable];
    
    [textview setFont:[NSFont fontWithName:@"Menlo" size:12]];
    
    [scrollview setDocumentView:textview];
    
    ct->add(ct, scrollview);
    
    // bind value
    if(value) {
        value->get = ui_textarea_get;
        value->set = ui_textarea_set;
        value->getsubstr = ui_textarea_getsubstr;
        value->insert = ui_textarea_insert;
        value->position = ui_textarea_position;
        value->selection = ui_textarea_selection;
        value->length = ui_textarea_length;
        value->value = NULL;
        value->obj = textview;
        
        TextChangeMgr *delegate = [[TextChangeMgr alloc]initWithValue:value context:obj->ctx];
        [textview setDelegate:delegate];
        
        NSUndoManager *undomgr = [[NSUndoManager alloc]init];
        value->undomgr = undomgr;
    }
    
    return textview;
}

char* ui_textarea_get(UiText *text) {
    if(text->value) {
        free(text->value);
    }
    NSTextView *textview = (NSTextView*)text->obj;
    NSString *str = [[textview textStorage]string];
    size_t length = [str lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
    const char *cstr = [str UTF8String];
    char *value = malloc(length + 1);
    memcpy(value, cstr, length);
    value[length] = '\0';
    text->value = value;
    return value;
}

void ui_textarea_set(UiText *text, char *str) {
    if(text->value) {
        free(text->value);
    }
    NSTextView *textview = (NSTextView*)text->obj;
    NSString *s = [[NSString alloc]initWithUTF8String:str];
    NSAttributedString *as = [[NSAttributedString alloc]initWithString:s];
    [[textview textStorage] setAttributedString:as];
    text->value = NULL;
}

char* ui_textarea_getsubstr(UiText *text, int begin, int end) {
    if(text->value) {
        free(text->value);
    }
    NSTextView *textview = (NSTextView*)text->obj;
    NSString *str = [[textview textStorage]string];
    NSRange range;
    range.location = begin;
    range.length = end - begin;
    
    NSString *substr = [str substringWithRange:range];
    size_t length = [substr lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
    const char *cstr = [substr UTF8String];
    char *value = malloc(length + 1);
    memcpy(value, cstr, length);
    value[length] = '\0';
    text->value = value;
    return value;
}

void ui_textarea_insert(UiText *text, int pos, char *str) {
    if(text->value) {
        free(text->value);
    }
    NSTextView *textview = (NSTextView*)text->obj;
    NSString *s = [[NSString alloc]initWithUTF8String:str];
    NSAttributedString *as = [[NSAttributedString alloc]initWithString:s];
    [[textview textStorage] insertAttributedString:as atIndex: pos];
    text->value = NULL;
}

int ui_textarea_position(UiText *text) {
    return [[[(NSTextView*)text->obj selectedRanges] objectAtIndex:0] rangeValue].location;
}

void ui_textarea_selection(UiText *text, int *begin, int *end) {
    NSRange range = [[[(NSTextView*)text->obj selectedRanges] objectAtIndex:0] rangeValue];
    *begin = range.location;
    *end = range.location + range.length;
}

int ui_textarea_length(UiText *text) {
    return [[(NSTextView*)text->obj textStorage] length];
}

void ui_text_undo(UiText *text) {
    [(NSUndoManager*)text->undomgr undo];
}

void ui_text_redo(UiText *text) {
    [(NSUndoManager*)text->undomgr redo];
}