import Markdown from "@ronradtke/react-native-markdown-display";
import { memo } from "react";
import { ActivityIndicator, StyleSheet, View } from "react-native";
import { CollapsibleMessage } from "@/components/CollapsibleMessage";
import { colors, monoFont } from "@/lib/theme";

type Props = {
  text: string;
  streaming?: boolean;
};

function AssistantMessageComponent({ text, streaming }: Props) {
  if (!text.trim()) {
    if (!streaming) {
      return null;
    }
    return (
      <View style={styles.thinking}>
        <ActivityIndicator size="small" color={colors.textMuted} />
      </View>
    );
  }

  return (
    <CollapsibleMessage text={text} forceExpanded={streaming} style={styles.container}>
      <Markdown style={markdownStyles} colorScheme="dark">
        {text}
      </Markdown>
    </CollapsibleMessage>
  );
}

export const AssistantMessage = memo(AssistantMessageComponent);

const styles = StyleSheet.create({
  container: {
    alignSelf: "stretch",
  },
  thinking: {
    alignSelf: "flex-start",
    paddingVertical: 4,
  },
});

const markdownStyles = StyleSheet.create({
  body: {
    color: colors.text,
    fontSize: 15,
    lineHeight: 22,
  },
  paragraph: {
    marginTop: 0,
    marginBottom: 10,
  },
  heading1: {
    color: colors.text,
    fontSize: 22,
    fontWeight: "700",
    marginTop: 12,
    marginBottom: 8,
  },
  heading2: {
    color: colors.text,
    fontSize: 19,
    fontWeight: "700",
    marginTop: 12,
    marginBottom: 6,
  },
  heading3: {
    color: colors.text,
    fontSize: 17,
    fontWeight: "700",
    marginTop: 10,
    marginBottom: 6,
  },
  heading4: {
    color: colors.text,
    fontSize: 15,
    fontWeight: "700",
    marginTop: 8,
    marginBottom: 4,
  },
  heading5: {
    color: colors.text,
    fontSize: 15,
    fontWeight: "600",
  },
  heading6: {
    color: colors.textSecondary,
    fontSize: 14,
    fontWeight: "600",
  },
  strong: {
    fontWeight: "700",
  },
  em: {
    fontStyle: "italic",
  },
  link: {
    color: colors.accent,
    textDecorationLine: "underline",
  },
  blockquote: {
    backgroundColor: colors.surfaceDeep,
    borderLeftWidth: 3,
    borderLeftColor: colors.border,
    paddingHorizontal: 12,
    paddingVertical: 4,
    marginVertical: 6,
    borderRadius: 4,
  },
  code_inline: {
    backgroundColor: colors.surface,
    color: colors.accent,
    fontFamily: monoFont,
    fontSize: 13,
    borderRadius: 4,
    paddingHorizontal: 4,
  },
  code_block: {
    backgroundColor: colors.surfaceDeep,
    borderColor: colors.border,
    borderWidth: 1,
    borderRadius: 8,
    color: colors.text,
    fontFamily: monoFont,
    fontSize: 12.5,
    lineHeight: 18,
    padding: 10,
    marginVertical: 6,
  },
  fence: {
    backgroundColor: colors.surfaceDeep,
    borderColor: colors.border,
    borderWidth: 1,
    borderRadius: 8,
    overflow: "hidden",
    marginVertical: 6,
  },
  fence_header: {
    backgroundColor: colors.surface,
    borderBottomColor: colors.border,
    borderBottomWidth: 1,
    paddingHorizontal: 10,
    paddingVertical: 4,
  },
  fence_code: {
    backgroundColor: colors.surfaceDeep,
    padding: 10,
  },
  fence_language_label: {
    color: colors.textMuted,
    fontFamily: monoFont,
    fontSize: 11,
  },
  fence_copy_text: {
    color: colors.textMuted,
    fontSize: 11,
  },
  fence_token: {
    color: colors.text,
    fontFamily: monoFont,
    fontSize: 12.5,
    lineHeight: 18,
  },
  bullet_list: {
    marginBottom: 10,
  },
  ordered_list: {
    marginBottom: 10,
  },
  list_item: {
    flexDirection: "row",
    marginBottom: 4,
  },
  bullet_list_icon: {
    color: colors.textMuted,
    marginRight: 8,
  },
  ordered_list_icon: {
    color: colors.textMuted,
    marginRight: 8,
  },
  hr: {
    backgroundColor: colors.border,
    height: 1,
    marginVertical: 12,
  },
  table: {
    borderWidth: 1,
    borderColor: colors.border,
    borderRadius: 6,
    marginVertical: 6,
  },
  th: {
    padding: 6,
    fontWeight: "700",
  },
  td: {
    padding: 6,
  },
  tr: {
    borderBottomWidth: 1,
    borderColor: colors.borderSubtle,
  },
});