JSJP_Student/jiaPei/Modules/LoginModule/ViewModel/RQVerificationSmsCodeViewModel.m

//
//  RQVerificationSmsCodeViewModel.m
//  YueXueChe
//
//  Created by 张嵘 on 2018/12/14.
//  Copyright © 2018 lee. All rights reserved.
//

#import "RQVerificationSmsCodeViewModel.h"
#import "YYTimer.h"


@interface RQVerificationSmsCodeViewModel ()
/// closeCommand
@property (nonatomic, readwrite, strong) RACCommand *closeCommand;
/// registerCommand
@property (nonatomic, readwrite, strong) RACCommand *sureCommand;
/// 验证码命令
@property (nonatomic, readwrite, strong) RACCommand *captchaCommand;
/// 注册按钮有效性
@property (nonatomic, readwrite, strong) RACSignal *validSureSignal;
/// 验证码按钮能否点击
@property (nonatomic, readwrite, strong) RACSignal *validCaptchaSignal;
/// 验证码显示
@property (nonatomic, readwrite, copy) NSString *captchaTitle;
/// error （PS；这个记录请求过程中的发生的错误，请求之前必须置nil）
@property (nonatomic, readwrite, strong) NSError *error;
/// Timer
@property (nonatomic, readwrite, strong) YYTimer *timer;
/// Count
@property (nonatomic, readwrite, assign) NSUInteger count;
/// valid (有效性)
@property (nonatomic, readwrite, assign) BOOL valid;
/// phone
@property (nonatomic, readwrite, copy) NSString *phone;
/// captcha
@property (nonatomic, readwrite, copy) NSString *captcha;
@end

@implementation RQVerificationSmsCodeViewModel

- (instancetype)initWithServices:(id<RQViewModelServices>)services params:(NSDictionary *)params {
	if (self = [super initWithServices:services params:params]) {
		self.phone = params[RQMobileLoginPhoneKey];
	}
	
	return self;
}

- (void)initialize {
	[super initialize];
	/// 显示导航栏的细线
	self.prefersNavigationBarBottomLineHidden = NO;
	self.title = @"修改密码";
	
	@weakify(self);
	self.closeCommand = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
		@strongify(self);
		[self.services dismissViewModelAnimated:YES completion:NULL];
		return [RACSignal empty];
	}];
	
	/// 按钮的有效性
	self.validSureSignal = [[RACSignal
								 combineLatest:@[RACObserve(self, phone),RACObserve(self, captcha)]
								 reduce:^(NSString *phone , NSString *captcha) {
									 return @(RQStringIsNotEmpty(phone) && RQStringIsNotEmpty(captcha));
								 }]
								distinctUntilChanged];
	
	/// 验证码按钮有效性
	self.captchaTitle = @" 获取验证码 ";
	RAC(self, valid) = [[RACObserve(self, timer.valid) map:^id(NSNumber * value) {
		return @(!value.boolValue);
	}] distinctUntilChanged];
	/// 验证码有效性
	self.validCaptchaSignal = RACObserve(self, valid);
	self.captchaCommand = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
		@strongify(self);
		/// 将错误置为nil
		self.error = nil;
		self.valid = NO;
		self.captchaTitle = @" 发送中... ";
		return [self getSmsCode];
	}];
	
	self.sureCommand = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(NSDictionary *captchadic) {
		@strongify(self);
		self.error = nil; // 先置nil
		self.captcha = captchadic[RQCaptchaKey];
		return [self verificationSmsCode];
	}];
}

#pragma mark - Action
- (void)_timerValueChanged:(YYTimer *)timer
{
	self.count--;
	if (self.count == 0) {
		[timer invalidate];
		self.timer = nil;
		[self _resetCaptcha];
		return;
	}
	self.captchaTitle = [NSString stringWithFormat:@" %zds后重新发送 ", self.count];
}
#pragma mark - 辅助方法
- (void)_resetCaptcha {
	self.valid = YES;
	self.captchaTitle = @" 获取验证码 ";
}

- (RACSignal *)getSmsCode {
	/// 执行
	@weakify(self);
	return [[[RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
		[[RQ_HTTP_Service getCodeWithTelePhone:self.phone] subscribeNext:^(id  _Nullable x) {
			[subscriber sendNext:x];
		} error:^(NSError * _Nullable error) {
			[subscriber sendError:error];
		} completed:^{
			[subscriber sendCompleted];
		}];
		return [RACDisposable disposableWithBlock:^{
			/// 取消任务
		}];
	}] doNext:^(id x) {
		@strongify(self);
		self.count = RQCaptchaFetchMaxWords;
		self.captchaTitle = @" 60s后重新发送 ";
		self.timer = [YYTimer timerWithTimeInterval:1 target:self selector:@selector(_timerValueChanged:) repeats:YES];
	}] doError:^(NSError *error) {
		@strongify(self);
		self.error = error;
		self.valid = YES;
		self.captchaTitle = @" 发送验证码 ";
	}];
}

- (RACSignal *)verificationSmsCode {
	@weakify(self);
	return [[[RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
		[[RQ_HTTP_Service verificationSmsCodeWithMobile:self.phone type:RQSMSCodeFindPassword code:self.captcha] subscribeNext:^(id  _Nullable x) {
			[subscriber sendNext:x];
		} error:^(NSError * _Nullable error) {
			[subscriber sendError:error];
		} completed:^{
			[subscriber sendCompleted];
		}];
		return [RACDisposable disposableWithBlock:^{
			/// 取消任务
		}];
	}] doNext:^(id  _Nullable x) {
		RQUpdatePasswordViewModel *model = [[RQUpdatePasswordViewModel alloc] initWithServices:self.services params:nil];
		[self.services pushViewModel:model animated:YES];
	}] doError:^(NSError * _Nonnull error) {
		@strongify(self);
		self.error = error;
	}] ;
}

@end