using System.Collections.Generic;
using ChatComponents;
using uiwidgets;
using Unity.UIWidgets.animation;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.material;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.rendering;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
using Image = Unity.UIWidgets.widgets.Image;

namespace UIWidgetsSample
{
    internal class Message : StatelessWidget
    {
        /// Build a custom message inside predefined bubble
        public readonly BuildCustomMessage buildCustomMessage;


        /// Any message type
        public readonly ChatComponents.Message message;

        /// Maximum message width
        public readonly int messageWidth;

        /// Called when user makes a long press on any message
        public readonly OnMessageLongPress onMessageLongPress;

        /// Called when user taps on any message
        public readonly OnMessageTap onMessageTap;

        /// See [TextMessage.onPreviewDataFetched]
        public readonly OnPreviewDataFetched onPreviewDataFetched;

        /// Rounds border of the message to visually group messages together.
        public readonly bool roundBorder;

        /// Show user avatar for the received message. Useful for a group chat.
        public readonly bool showAvatar;

        /// See [TextMessage.showName]
        public readonly bool showName;

        /// Show message's status
        public readonly bool showStatus;

        /// Show user avatars for received messages. Useful for a group chat.
        public readonly bool showUserAvatars;

        /// See [TextMessage.usePreviewData]
        public readonly bool usePreviewData;

        /// Creates a particular message from any message type
        public Message(
            ChatComponents.Message message,
            int messageWidth,
            bool roundBorder,
            bool showAvatar,
            bool showName,
            bool showStatus,
            bool showUserAvatars,
            bool usePreviewData,
            Key key = null,
            OnMessageLongPress onMessageLongPress = null,
            OnMessageTap onMessageTap = null,
            OnPreviewDataFetched onPreviewDataFetched = null,
            BuildCustomMessage buildCustomMessage = null
        ) : base(key)
        {
            this.message = message;
            this.messageWidth = messageWidth;
            this.buildCustomMessage = buildCustomMessage;
            this.onMessageTap = onMessageTap;
            this.onMessageLongPress = onMessageLongPress;
            this.onPreviewDataFetched = onPreviewDataFetched;
            this.roundBorder = roundBorder;
            this.showAvatar = showAvatar;
            this.showName = showName;
            this.showStatus = showStatus;
            this.showUserAvatars = showUserAvatars;
            this.usePreviewData = usePreviewData;
        }

        private Widget _buildAvatar(BuildContext context)
        {
            var color =  ChatUtils.getUserAvatarNameColor(message.author,
                InheritedChatTheme.of(context).theme.userAvatarNameColors);
            var hasImage = message.author.imageUrl != null;
            string name =  ChatUtils.getUserName(message.author);

            return showAvatar
                ? new Container(
                    margin: EdgeInsets.only(right: 8),
                    child: new CircleAvatar(
                        backgroundImage:
                        hasImage ? new NetworkImage(message.author.imageUrl == null ? "" : (string)message.author.imageUrl) : null,
                        backgroundColor: color,
                        radius: 16,
                        child: !hasImage
                            ? new Text(
                                name.isEmpty() ? "" : name[0].ToString().ToUpper(),
                                style: InheritedChatTheme.of(context).theme.userAvatarTextStyle
                            )
                            : null
                    )
                )
                : new Container(
                    margin: EdgeInsets.only(right: 40)
                );
        }

        private Widget _buildMessage()
        {
            switch (message.type)
            {
                case MessageType.custom:
                    var customMessage = message as CustomMessage;
                    return buildCustomMessage != null
                        ? buildCustomMessage(customMessage)
                        : new SizedBox();
                /*case MessageType.file:
                    var fileMessage = message as ChatComponents.FileMessage;
                    return new FileMessage(
                        message: fileMessage
                    );
                case MessageType.image:
                    var imageMessage = message as ChatComponents.ImageMessage;
                    return new ImageMessage(
                        message: imageMessage,
                        messageWidth: messageWidth
                    );*/
                case MessageType.text:
                    var textMessage = message as ChatComponents.TextMessage;
                    return new TextMessage(
                        message: textMessage,
                        onPreviewDataFetched: onPreviewDataFetched,
                        showName: showName,
                        usePreviewData: usePreviewData
                    );
                default:
                    return new SizedBox();
            }
        }

        private Widget _buildStatus(BuildContext context)
        {
            switch (message.status)
            {
                case Status.error:
                    return InheritedChatTheme.of(context).theme.errorIcon != null
                        ? InheritedChatTheme.of(context).theme.errorIcon
                        : Image.asset(
                            "assets/icon-error.png",
                            color: InheritedChatTheme.of(context).theme.errorColor,
                            package: "flutter_chat_ui"
                        );
                case Status.sent:
                case Status.delivered:
                    return InheritedChatTheme.of(context).theme.deliveredIcon != null
                        ? InheritedChatTheme.of(context).theme.deliveredIcon
                        : Image.asset(
                            "assets/icon-delivered.png",
                            color: InheritedChatTheme.of(context).theme.primaryColor,
                            package: "flutter_chat_ui"
                        );
                case Status.seen:
                    return InheritedChatTheme.of(context).theme.seenIcon != null
                        ? InheritedChatTheme.of(context).theme.seenIcon
                        : Image.file(
                            "assets/icon-seen.png",
                            color: InheritedChatTheme.of(context).theme.primaryColor,
                            scale:1
                            //package: "flutter_chat_ui"
                        );
                
                case Status.sending:
                    return new Center(
                        child: new SizedBox(
                            height: 10,
                            width: 10,
                            child: new CircularProgressIndicator(
                                backgroundColor: Colors.transparent,
                                strokeWidth: 1.5f,
                                valueColor: new AlwaysStoppedAnimation<Color>(
                                    InheritedChatTheme.of(context).theme.primaryColor
                                )
                            )
                        )
                    );
                default:
                    return new SizedBox();
            }
        }

        public override Widget build(BuildContext context)
        {
            var _user = InheritedUser.of(context).user;
            var _messageBorderRadius =
                InheritedChatTheme.of(context).theme.messageBorderRadius;
            var _borderRadius = BorderRadius.only(
                bottomLeft: Radius.circular(_user.id == message.author.id || roundBorder
                    ? _messageBorderRadius
                    : 0),
                bottomRight: Radius.circular(_user.id == message.author.id
                    ? roundBorder
                        ? _messageBorderRadius
                        : 0
                    : _messageBorderRadius),
                topLeft: Radius.circular(_messageBorderRadius),
                topRight: Radius.circular(_messageBorderRadius)
            );
            var _currentUserIsAuthor = _user.id == message.author.id;
            var results = new List<Widget>();
            if (!_currentUserIsAuthor && showUserAvatars)
                results.Add(_buildAvatar(context));
            results.Add(new ConstrainedBox(
                constraints: new BoxConstraints(
                    maxWidth: messageWidth * 1f
                ),
                child: new Column(
                    crossAxisAlignment: CrossAxisAlignment.end,
                    children: new List<Widget>
                    {
                        new GestureDetector(
                            onLongPress: () => onMessageLongPress?.Invoke(message),
                            onTap: () => onMessageTap?.Invoke(message),
                            child: new Container(
                                decoration: new BoxDecoration(
                                    borderRadius: _borderRadius,
                                    color: !_currentUserIsAuthor ||
                                           message.type == MessageType.image
                                        ? InheritedChatTheme.of(context).theme.secondaryColor
                                        : InheritedChatTheme.of(context).theme.primaryColor
                                ),
                                child: new ClipRRect(
                                    borderRadius: _borderRadius,
                                    child: _buildMessage()
                                )
                            )
                        )
                    }
                )
            ));
            if (_currentUserIsAuthor)
                results.Add(new Padding(
                    padding: EdgeInsets.symmetric(horizontal: 4),
                    child: new Center(
                        child: new SizedBox(
                            height: 16,
                            width: 16,
                            child: showStatus ? _buildStatus(context) : null
                        )
                    )
                ));
            return new Container(
                alignment: _user.id == message.author.id
                    ? Alignment.centerRight
                    : Alignment.centerLeft,
                margin: EdgeInsets.only(
                    bottom: 4,
                    left: 20
                ),
                
                child: new Row(
                    crossAxisAlignment: CrossAxisAlignment.end,
                    mainAxisSize: MainAxisSize.min,
                    children: results)
            );
        }
    }
}