//
//  DemoViewController.m
//  NewHttpDNSTestDemo
//

#import "DemoViewController.h"
#import "DemoResolveModel.h"
#import "DemoLogViewController.h"
#import "DemoHttpdnsScenario.h"

@interface DemoViewController () <DemoHttpdnsScenarioDelegate>

@property (nonatomic, strong) DemoHttpdnsScenario *scenario;
@property (nonatomic, strong) DemoHttpdnsScenarioConfig *scenarioConfig;
@property (nonatomic, strong) DemoResolveModel *model;

@property (nonatomic, strong) UIScrollView *scrollView;
@property (nonatomic, strong) UIStackView *stack;

@property (nonatomic, strong) UITextField *hostField;
@property (nonatomic, strong) UISegmentedControl *queryTypeSeg;

@property (nonatomic, strong) UILabel *elapsedLabel;
@property (nonatomic, strong) UILabel *ttlLabel;
@property (nonatomic, strong) UITextView *resultTextView;

@property (nonatomic, weak) DemoLogViewController *presentedLogVC;

@end

@implementation DemoViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"HTTPDNS Demo";
    self.view.backgroundColor = [UIColor systemBackgroundColor];
    self.scenario = [[DemoHttpdnsScenario alloc] initWithDelegate:self];
    self.model = self.scenario.model;
    self.scenarioConfig = [[DemoHttpdnsScenarioConfig alloc] init];
    [self buildUI];
    [self reloadUIFromModel:self.model];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]
        initWithTitle:@"日志" style:UIBarButtonItemStylePlain target:self action:@selector(onShowLog)];
}

- (void)buildUI {
    self.scrollView = [[UIScrollView alloc] init];
    self.scrollView.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:self.scrollView];
    [NSLayoutConstraint activateConstraints:@[
        [self.scrollView.topAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.topAnchor],
        [self.scrollView.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
        [self.scrollView.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor],
        [self.scrollView.bottomAnchor constraintEqualToAnchor:self.view.bottomAnchor]
    ]];

    self.stack = [[UIStackView alloc] init];
    self.stack.axis = UILayoutConstraintAxisVertical;
    self.stack.spacing = 12.0;
    self.stack.translatesAutoresizingMaskIntoConstraints = NO;
    [self.scrollView addSubview:self.stack];
    [NSLayoutConstraint activateConstraints:@[
        [self.stack.topAnchor constraintEqualToAnchor:self.scrollView.topAnchor constant:16],
        [self.stack.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor constant:16],
        [self.stack.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor constant:-16],
        [self.stack.bottomAnchor constraintEqualToAnchor:self.scrollView.bottomAnchor constant:-16],
        [self.stack.widthAnchor constraintEqualToAnchor:self.view.widthAnchor constant:-32]
    ]];

    // Host 输入
    UIStackView *row1 = [self labeledRow:@"Host"];
    self.hostField = [[UITextField alloc] init];
    self.hostField.placeholder = @"demodemo.cloudxdr.com";
    self.hostField.text = self.scenarioConfig.host;
    self.hostField.borderStyle = UITextBorderStyleRoundedRect;
    [row1 addArrangedSubview:self.hostField];
    [self.stack addArrangedSubview:row1];

    // 查询类型
    UIStackView *row2 = [self labeledRow:@"类型"];
    self.queryTypeSeg = [[UISegmentedControl alloc] initWithItems:@[@"A (IPv4)", @"AAAA (IPv6)", @"both"]];
    self.queryTypeSeg.selectedSegmentIndex = 0;
    [self.queryTypeSeg addTarget:self action:@selector(onQueryTypeChanged:) forControlEvents:UIControlEventValueChanged];
    [row2 addArrangedSubview:self.queryTypeSeg];
    [self.stack addArrangedSubview:row2];

    // 解析按钮
    UIButton *btnResolve = [self filledButton:@"Resolve" action:@selector(onResolve)];
    [self.stack addArrangedSubview:btnResolve];

    // 耗时 / TTL
    UIStackView *info = [self labeledRow:@"Info"];
    self.elapsedLabel = [self monoLabel:@"elapsed: - ms"];
    self.ttlLabel = [self monoLabel:@"ttl: -"];
    [info addArrangedSubview:self.elapsedLabel];
    [info addArrangedSubview:self.ttlLabel];
    [self.stack addArrangedSubview:info];

    // 结果
    UILabel *resultTitle = [[UILabel alloc] init];
    resultTitle.text = @"结果";
    resultTitle.font = [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];
    [self.stack addArrangedSubview:resultTitle];

    self.resultTextView = [[UITextView alloc] init];
    self.resultTextView.translatesAutoresizingMaskIntoConstraints = NO;
    self.resultTextView.editable = NO;
    if (@available(iOS 13.0, *)) {
        self.resultTextView.font = [UIFont monospacedSystemFontOfSize:12 weight:UIFontWeightRegular];
        self.resultTextView.textColor = [UIColor labelColor];
    }
    self.resultTextView.backgroundColor = [UIColor clearColor];
    self.resultTextView.textContainerInset = UIEdgeInsetsMake(8, 12, 8, 12);
    [self.stack addArrangedSubview:self.resultTextView];
    [self.resultTextView.heightAnchor constraintEqualToConstant:320].active = YES;
}

#pragma mark - Actions

- (void)onQueryTypeChanged:(UISegmentedControl *)seg {
    NSArray *types = @[@"A", @"AAAA", @"both"];
    self.scenarioConfig.queryType = types[seg.selectedSegmentIndex];
    [self.scenario applyConfig:self.scenarioConfig];
}

- (void)onResolve {
    [self.view endEditing:YES];
    NSString *host = self.hostField.text.length > 0 ? self.hostField.text : @"demodemo.cloudxdr.com";
    self.scenarioConfig.host = host;
    [self.scenario applyConfig:self.scenarioConfig];
    [self.scenario resolve];
}

- (void)onShowLog {
    DemoLogViewController *logVC = [DemoLogViewController new];
    [logVC setInitialText:[self.scenario logSnapshot]];
    self.presentedLogVC = logVC;
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:logVC];
    nav.modalPresentationStyle = UIModalPresentationAutomatic;
    [self presentViewController:nav animated:YES completion:nil];
}

- (void)reloadUIFromModel:(DemoResolveModel *)model {
    self.model = model;
    if (![self.hostField isFirstResponder]) {
        self.hostField.text = model.host;
    }
    self.elapsedLabel.text = [NSString stringWithFormat:@"elapsed: %.0f ms", model.elapsedMs];
    self.ttlLabel.text = [NSString stringWithFormat:@"ttl v4/v6: %.0f/%.0f s", model.ttlV4, model.ttlV6];
    self.resultTextView.text = [self buildResultText:model];
}

- (NSString *)buildResultText:(DemoResolveModel *)model {
    if (model.error != nil) {
        return [NSString stringWithFormat:@"Error:\n%@", model.error.localizedDescription];
    }
    NSDictionary *dict = @{
        @"host":    model.host ?: @"",
        @"elapsed": [NSString stringWithFormat:@"%.0f ms", model.elapsedMs],
        @"ttl":     @{ @"v4": @(model.ttlV4), @"v6": @(model.ttlV6) },
        @"ipv4":    model.ipv4s ?: @[],
        @"ipv6":    model.ipv6s ?: @[]
    };
    NSData *data = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:nil];
    if (data == nil) return @"{}";
    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}

#pragma mark - Helpers

- (UIStackView *)labeledRow:(NSString *)title {
    UIStackView *row = [[UIStackView alloc] init];
    row.axis = UILayoutConstraintAxisHorizontal;
    row.alignment = UIStackViewAlignmentCenter;
    row.spacing = 8.0;
    UILabel *label = [[UILabel alloc] init];
    label.text = title;
    [label.widthAnchor constraintGreaterThanOrEqualToConstant:64].active = YES;
    [row addArrangedSubview:label];
    return row;
}

- (UILabel *)monoLabel:(NSString *)text {
    UILabel *l = [[UILabel alloc] init];
    l.text = text;
    if (@available(iOS 13.0, *)) {
        l.font = [UIFont monospacedSystemFontOfSize:12 weight:UIFontWeightRegular];
    }
    return l;
}

- (UIButton *)filledButton:(NSString *)title action:(SEL)sel {
    UIButton *b = [UIButton buttonWithType:UIButtonTypeSystem];
    [b setTitle:title forState:UIControlStateNormal];
    b.backgroundColor = [UIColor systemBlueColor];
    [b setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    b.layer.cornerRadius = 8;
    [b.heightAnchor constraintEqualToConstant:44].active = YES;
    [b addTarget:self action:sel forControlEvents:UIControlEventTouchUpInside];
    return b;
}

#pragma mark - DemoHttpdnsScenarioDelegate

- (void)scenario:(DemoHttpdnsScenario *)scenario didUpdateModel:(DemoResolveModel *)model {
    [self reloadUIFromModel:model];
}

- (void)scenario:(DemoHttpdnsScenario *)scenario didAppendLogLine:(NSString *)line {
    if (self.presentedLogVC != nil) {
        [self.presentedLogVC appendLine:line];
    }
}

@end