/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    A paper company which handles trees, logs, and paper. Uses a custom logging component.

 */

@import os.log;

#import "APLPaperCompany.h"

#define NUM_STARTING_TREES 5

// We want to use a custom logging component for our model (as in model-view-controller).

// This allows us to enable debug logging for just our model, so we don't have to wade

// through logs from the view just to see what's wrong with one method in our model.

static os_log_t model_log;

@interface APLPaperCompany ()

@property (nonatomic, readwrite) NSString *companyName;

@property (nonatomic, readwrite) NSUInteger numTrees;

@property (nonatomic, readwrite) NSUInteger numLogs;

@property (nonatomic, readwrite) NSUInteger numPapers;

@end

@implementation APLPaperCompany

+ (void)initialize {

    // We want to use a custom logging component for our model, so we need to set it up before its first use.

    model_log = os_log_create("com.example.apple-samplecode.Paper-Company", "Model");

}

- (instancetype)initWithCompanyName:(NSString *)name {

    if ((self = [super init])) {

        self.companyName = name;

        self.numTrees = NUM_STARTING_TREES;

        self.numLogs = 0;

        self.numPapers = 0;

    }

    return self;

}

- (void)chopDownTree {

    // Make sure we actually have a tree to chop down.

    if (self.numTrees == 0) {

        os_log_info(model_log, "No trees left to chop down!");

        return;

    }

    // We're good.

    os_log_info(model_log, "Chopped down a tree!");

    self.numTrees--;

    self.numLogs++;

    os_log_debug(model_log, "%lu trees remaining, %lu logs accumulated",

                 (unsigned long)self.numTrees, (unsigned long)self.numLogs);

}

- (void)makePaper {

    // Make sure we actually have a log to turn into paper.

    if (self.numLogs == 0) {

        os_log_info(model_log, "No logs to pulverize into paper!");

        return;

    }

    // We're good.

    os_log_info(model_log, "Making paper from our logs!");

    os_log_debug(model_log, "Pulverizing %lu logs into paper.", (unsigned long)self.numLogs);

    self.numPapers += self.numLogs;

    self.numLogs = 0;

    os_log_debug(model_log, "We now have %lu papers.", (unsigned long)self.numPapers);

}

@end