import 'dart:convert';

import 'package:flutter/material.dart';

import '../about/internal/application/TextType.dart';
import '../utils/Colors.dart';
import 'text/Text.dart';

/// Where a portrait comes from. A stored `pic` is one of:
/// - `data:image/...;base64,...` — a photo picked on this device
/// - `http(s)://...` — a photo the server holds
/// - `asset:assets/images/...` — a bundled sample (mock mode)
/// Anything else, or empty, has no photo.
ImageProvider? portraitImage(String pic) {
  if (pic.startsWith("data:image")) {
    final int comma = pic.indexOf(",");
    if (comma < 0) {
      return null;
    }
    return MemoryImage(base64Decode(pic.substring(comma + 1)));
  }
  if (pic.startsWith("http://") || pic.startsWith("https://")) {
    return NetworkImage(pic);
  }
  if (pic.startsWith("asset:")) {
    return AssetImage(pic.substring("asset:".length));
  }
  return null;
}

/// A round photo of a person. Without a photo, their initial on a soft
/// neutral disc — never a landscape: a person should look like a person.
Widget portrait(String pic, String name, double size,
    {Color? border, double borderWidth = 2}) {
  final ImageProvider? image = portraitImage(pic);
  final String initial =
      name.trim().isEmpty ? "?" : name.trim().substring(0, 1).toUpperCase();

  return Container(
    width: size,
    height: size,
    alignment: Alignment.center,
    clipBehavior: Clip.antiAlias,
    decoration: BoxDecoration(
      shape: BoxShape.circle,
      color: colorMuted,
      border: Border.all(color: border ?? colorWhite, width: borderWidth),
      image: image == null
          ? null
          : DecorationImage(image: image, fit: BoxFit.cover),
    ),
    child: image == null
        ? text(initial, size * 0.4, TextType.Medium, color: colorInkSoft)
        : null,
  );
}