/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @flow
 * @providesModule TextInputExample
 */
'use strict';

var React = require('react');
var ReactNative = require('react-native');
var {
  Text,
  TextInput,
  View,
  StyleSheet,
} = ReactNative;

class TextEventsExample extends React.Component {
  state = {
    curText: '<No Event>',
    prevText: '<No Event>',
    prev2Text: '<No Event>',
  };

  updateText = (text) => {
    this.setState((state) => {
      return {
        curText: text,
        prevText: state.curText,
        prev2Text: state.prevText,
      };
    });
  };

  render() {
    return (
      <View>
        <TextInput
          autoCapitalize="none"
          placeholder="Enter text to see events"
          autoCorrect={false}
          onFocus={() => this.updateText('onFocus')}
          onBlur={() => this.updateText('onBlur')}
          onChange={(event) => this.updateText(
            'onChange text: ' + event.nativeEvent.text
          )}
          onContentSizeChange={(event) => this.updateText(
            'onContentSizeChange size: ' + event.nativeEvent.contentSize
          )}
          onEndEditing={(event) => this.updateText(
            'onEndEditing text: ' + event.nativeEvent.text
          )}
          onSubmitEditing={(event) => this.updateText(
            'onSubmitEditing text: ' + event.nativeEvent.text
          )}
          style={styles.singleLine}
        />
        <Text style={styles.eventLabel}>
          {this.state.curText}{'\n'}
          (prev: {this.state.prevText}){'\n'}
          (prev2: {this.state.prev2Text})
        </Text>
      </View>
    );
  }
}

class AutoExpandingTextInput extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      height: 0,
    };
  }
  render() {
    return (
      <TextInput
        {...this.props}
        multiline={true}
        onContentSizeChange={(event) => {
          this.setState({height: event.nativeEvent.contentSize.height});
        }}
        style={[styles.default, {height: Math.min(200, Math.max(35, this.state.height))}]}
      />
    );
  }
}

class RewriteExample extends React.Component {
  constructor(props) {
    super(props);
    this.state = {text: ''};
  }
  render() {
    var limit = 20;
    var remainder = limit - this.state.text.length;
    var remainderColor = remainder > 5 ? 'blue' : 'red';
    return (
      <View style={styles.rewriteContainer}>
        <TextInput
          multiline={false}
          maxLength={limit}
          onChangeText={(text) => {
            text = text.replace(/ /g, '_');
            this.setState({text});
          }}
          style={styles.default}
          value={this.state.text}
        />
        <Text style={[styles.remainder, {color: remainderColor}]}>
          {remainder}
        </Text>
      </View>
    );
  }
}

class TokenizedTextExample extends React.Component {
  constructor(props) {
    super(props);
    this.state = {text: 'Hello #World'};
  }
  render() {

    //define delimiter
    let delimiter = /\s+/;

    //split string
    let _text = this.state.text;
    let token, index, parts = [];
    while (_text) {
      delimiter.lastIndex = 0;
      token = delimiter.exec(_text);
      if (token === null) {
        break;
      }
      index = token.index;
      if (token[0].length === 0) {
        index = 1;
      }
      parts.push(_text.substr(0, index));
      parts.push(token[0]);
      index = index + token[0].length;
      _text = _text.slice(index);
    }
    parts.push(_text);

    //highlight hashtags
    parts = parts.map((text) => {
      if (/^#/.test(text)) {
        return <Text key={text} style={styles.hashtag}>{text}</Text>;
      } else {
        return text;
      }
    });

    return (
      <View>
        <TextInput
          multiline={true}
          style={styles.multiline}
          onChangeText={(text) => {
            this.setState({text});
          }}>
          <Text>{parts}</Text>
        </TextInput>
      </View>
    );
  }
}

class BlurOnSubmitExample extends React.Component {
  focusNextField = (nextField) => {
    this.refs[nextField].focus();
  };

  render() {
    return (
      <View>
        <TextInput
          ref="1"
          style={styles.singleLine}
          placeholder="blurOnSubmit = false"
          returnKeyType="next"
          blurOnSubmit={false}
          onSubmitEditing={() => this.focusNextField('2')}
        />
        <TextInput
          ref="2"
          style={styles.singleLine}
          keyboardType="email-address"
          placeholder="blurOnSubmit = false"
          returnKeyType="next"
          blurOnSubmit={false}
          onSubmitEditing={() => this.focusNextField('3')}
        />
        <TextInput
          ref="3"
          style={styles.singleLine}
          keyboardType="url"
          placeholder="blurOnSubmit = false"
          returnKeyType="next"
          blurOnSubmit={false}
          onSubmitEditing={() => this.focusNextField('4')}
        />
        <TextInput
          ref="4"
          style={styles.singleLine}
          keyboardType="numeric"
          placeholder="blurOnSubmit = false"
          blurOnSubmit={false}
          onSubmitEditing={() => this.focusNextField('5')}
        />
        <TextInput
          ref="5"
          style={styles.singleLine}
          keyboardType="numbers-and-punctuation"
          placeholder="blurOnSubmit = true"
          returnKeyType="done"
        />
      </View>
    );
  }
}

class ToggleDefaultPaddingExample extends React.Component {
  constructor(props) {
    super(props);
    this.state = {hasPadding: false};
  }
  render() {
    return (
      <View>
        <TextInput style={this.state.hasPadding ? { padding: 0 } : null}/>
        <Text onPress={() => this.setState({hasPadding: !this.state.hasPadding})}>
          Toggle padding
        </Text>
      </View>
    );
  }
}

type SelectionExampleState = {
  selection: {
    start: number;
    end: number;
  };
  value: string;
};

class SelectionExample extends React.Component {
  state: SelectionExampleState;

  _textInput: any;

  constructor(props) {
    super(props);
    this.state = {
      selection: {start: 0, end: 0},
      value: props.value
    };
  }

  onSelectionChange({nativeEvent: {selection}}) {
    this.setState({selection});
  }

  getRandomPosition() {
    var length = this.state.value.length;
    return Math.round(Math.random() * length);
  }

  select(start, end) {
    this._textInput.focus();
    this.setState({selection: {start, end}});
  }

  selectRandom() {
    var positions = [this.getRandomPosition(), this.getRandomPosition()].sort();
    this.select(...positions);
  }

  placeAt(position) {
    this.select(position, position);
  }

  placeAtRandom() {
    this.placeAt(this.getRandomPosition());
  }

  render() {
    var length = this.state.value.length;

    return (
      <View>
        <TextInput
          multiline={this.props.multiline}
          onChangeText={(value) => this.setState({value})}
          onSelectionChange={this.onSelectionChange.bind(this)}
          ref={textInput => (this._textInput = textInput)}
          selection={this.state.selection}
          style={this.props.style}
          value={this.state.value}
        />
        <View>
          <Text>
            selection = {JSON.stringify(this.state.selection)}
          </Text>
          <Text onPress={this.placeAt.bind(this, 0)}>
            Place at Start (0, 0)
          </Text>
          <Text onPress={this.placeAt.bind(this, length)}>
            Place at End ({length}, {length})
          </Text>
          <Text onPress={this.placeAtRandom.bind(this)}>
            Place at Random
          </Text>
          <Text onPress={this.select.bind(this, 0, length)}>
            Select All
          </Text>
          <Text onPress={this.selectRandom.bind(this)}>
            Select Random
          </Text>
        </View>
      </View>
    );
  }
}

var styles = StyleSheet.create({
  multiline: {
    height: 60,
    fontSize: 16,
    padding: 4,
    marginBottom: 10,
  },
  eventLabel: {
    margin: 3,
    fontSize: 12,
  },
  singleLine: {
    fontSize: 16,
    padding: 4,
  },
  singleLineWithHeightTextInput: {
    height: 30,
  },
  hashtag: {
    color: 'blue',
    fontWeight: 'bold',
  },
});

exports.title = '<TextInput>';
exports.description = 'Single and multi-line text inputs.';
exports.examples = [
  {
    title: 'Auto-focus',
    render: function() {
      return (
        <TextInput
          autoFocus={true}
          style={styles.singleLine}
          accessibilityLabel="I am the accessibility label for text input"
        />
      );
    }
  },
  {
    title: "Live Re-Write (<sp>  ->  '_')",
    render: function() {
      return <RewriteExample />;
    }
  },
  {
    title: 'Auto-capitalize',
    render: function() {
      var autoCapitalizeTypes = [
        'none',
        'sentences',
        'words',
        'characters',
      ];
      var examples = autoCapitalizeTypes.map((type) => {
        return (
          <TextInput
            key={type}
            autoCapitalize={type}
            placeholder={'autoCapitalize: ' + type}
            style={styles.singleLine}
          />
        );
      });
      return <View>{examples}</View>;
    }
  },
  {
    title: 'Auto-correct',
    render: function() {
      return (
        <View>
          <TextInput
            autoCorrect={true}
            placeholder="This has autoCorrect"
            style={styles.singleLine}
          />
          <TextInput
            autoCorrect={false}
            placeholder="This does not have autoCorrect"
            style={styles.singleLine}
          />
        </View>
      );
    }
  },
  {
    title: 'Keyboard types',
    render: function() {
      var keyboardTypes = [
        'default',
        'email-address',
        'numeric',
        'phone-pad',
      ];
      var examples = keyboardTypes.map((type) => {
        return (
          <TextInput
            key={type}
            keyboardType={type}
            placeholder={'keyboardType: ' + type}
            style={styles.singleLine}
          />
        );
      });
      return <View>{examples}</View>;
    }
  },
  {
    title: 'Blur on submit',
    render: function(): React.Element { return <BlurOnSubmitExample />; },
  },
  {
    title: 'Event handling',
    render: function(): React.Element { return <TextEventsExample />; },
  },
  {
    title: 'Colors and text inputs',
    render: function() {
      return (
        <View>
          <TextInput
            style={[styles.singleLine]}
            defaultValue="Default color text"
          />
          <TextInput
            style={[styles.singleLine, {color: 'green'}]}
            defaultValue="Green Text"
          />
          <TextInput
            placeholder="Default placeholder text color"
            style={styles.singleLine}
          />
          <TextInput
            placeholder="Red placeholder text color"
            placeholderTextColor="red"
            style={styles.singleLine}
          />
          <TextInput
            placeholder="Default underline color"
            style={styles.singleLine}
          />
          <TextInput
            placeholder="Blue underline color"
            style={styles.singleLine}
            underlineColorAndroid="blue"
          />
          <TextInput
            defaultValue="Same BackgroundColor as View "
            style={[styles.singleLine, {backgroundColor: 'rgba(100, 100, 100, 0.3)'}]}>
            <Text style={{backgroundColor: 'rgba(100, 100, 100, 0.3)'}}>
              Darker backgroundColor
            </Text>
          </TextInput>
          <TextInput
            defaultValue="Highlight Color is red"
            selectionColor={'red'}
            style={styles.singleLine}>
          </TextInput>
        </View>
      );
    }
  },
  {
    title: 'Text input, themes and heights',
    render: function() {
      return (
        <TextInput
          placeholder="If you set height, beware of padding set from themes"
          style={[styles.singleLineWithHeightTextInput]}
        />
      );
    }
  },
  {
    title: 'fontFamily, fontWeight and fontStyle',
    render: function() {
      return (
        <View>
          <TextInput
            style={[styles.singleLine, {fontFamily: 'sans-serif'}]}
            placeholder="Custom fonts like Sans-Serif are supported"
          />
          <TextInput
            style={[styles.singleLine, {fontFamily: 'sans-serif', fontWeight: 'bold'}]}
            placeholder="Sans-Serif bold"
          />
          <TextInput
            style={[styles.singleLine, {fontFamily: 'sans-serif', fontStyle: 'italic'}]}
            placeholder="Sans-Serif italic"
          />
          <TextInput
            style={[styles.singleLine, {fontFamily: 'serif'}]}
            placeholder="Serif"
          />
        </View>
      );
    }
  },
  {
    title: 'Passwords',
    render: function() {
      return (
        <View>
          <TextInput
            defaultValue="iloveturtles"
            secureTextEntry={true}
            style={styles.singleLine}
          />
          <TextInput
            secureTextEntry={true}
            style={[styles.singleLine, {color: 'red'}]}
            placeholder="color is supported too"
            placeholderTextColor="red"
          />
        </View>
      );
    }
  },
  {
    title: 'Editable',
    render: function() {
      return (
        <TextInput
           defaultValue="Can't touch this! (>'-')> ^(' - ')^ <('-'<) (>'-')> ^(' - ')^"
           editable={false}
           style={styles.singleLine}
         />
      );
    }
  },
  {
    title: 'Multiline',
    render: function() {
      return (
        <View>
          <TextInput
            autoCorrect={true}
            placeholder="multiline, aligned top-left"
            placeholderTextColor="red"
            multiline={true}
            style={[styles.multiline, {textAlign: 'left', textAlignVertical: 'top'}]}
          />
          <TextInput
            autoCorrect={true}
            placeholder="multiline, aligned center"
            placeholderTextColor="green"
            multiline={true}
            style={[styles.multiline, {textAlign: 'center', textAlignVertical: 'center'}]}
          />
          <TextInput
            autoCorrect={true}
            multiline={true}
            style={[styles.multiline, {color: 'blue'}, {textAlign: 'right', textAlignVertical: 'bottom'}]}>
            <Text style={styles.multiline}>multiline with children, aligned bottom-right</Text>
          </TextInput>
        </View>
      );
    }
  },
  {
    title: 'Fixed number of lines',
    platform: 'android',
    render: function() {
      return (
        <View>
          <TextInput numberOfLines={2}
            multiline={true}
            placeholder="Two line input"
          />
          <TextInput numberOfLines={5}
            multiline={true}
            placeholder="Five line input"
          />
        </View>
      );
    }
  },
  {
    title: 'Auto-expanding',
    render: function() {
      return (
        <View>
          <AutoExpandingTextInput
            placeholder="height increases with content"
            defaultValue="React Native enables you to build world-class application experiences on native platforms using a consistent developer experience based on JavaScript and React. The focus of React Native is on developer efficiency across all the platforms you care about — learn once, write anywhere. Facebook uses React Native in multiple production apps and will continue investing in React Native."
            enablesReturnKeyAutomatically={true}
            returnKeyType="done"
          />
        </View>
      );
    }
  },
  {
    title: 'Attributed text',
    render: function() {
      return <TokenizedTextExample />;
    }
  },
  {
    title: 'Return key',
    render: function() {
      var returnKeyTypes = [
        'none',
        'go',
        'search',
        'send',
        'done',
        'previous',
        'next',
      ];
      var returnKeyLabels = [
        'Compile',
        'React Native',
      ];
      var examples = returnKeyTypes.map((type) => {
        return (
          <TextInput
            key={type}
            returnKeyType={type}
            placeholder={'returnKeyType: ' + type}
            style={styles.singleLine}
          />
        );
      });
      var types = returnKeyLabels.map((type) => {
        return (
          <TextInput
            key={type}
            returnKeyLabel={type}
            placeholder={'returnKeyLabel: ' + type}
            style={styles.singleLine}
          />
        );
      });
      return <View>{examples}{types}</View>;
    }
  },
  {
    title: 'Inline Images',
    render: function() {
      return (
        <View>
          <TextInput
            inlineImageLeft="ic_menu_black_24dp"
            placeholder="This has drawableLeft set"
            style={styles.singleLine}
          />
          <TextInput
            inlineImageLeft="ic_menu_black_24dp"
            inlineImagePadding={30}
            placeholder="This has drawableLeft and drawablePadding set"
            style={styles.singleLine}
          />
          <TextInput
            placeholder="This does not have drawable props set"
            style={styles.singleLine}
          />
        </View>
      );
    }
  },
  {
    title: 'Toggle Default Padding',
    render: function(): React.Element { return <ToggleDefaultPaddingExample />; },
  },
  {
    title: 'Text selection & cursor placement',
    render: function() {
      return (
        <View>
          <SelectionExample
            style={styles.default}
            value="text selection can be changed"
          />
          <SelectionExample
            multiline
            style={styles.multiline}
            value={"multiline text selection\ncan also be changed"}
          />
        </View>
      );
    }
  },
];