import React, { useMemo, useState } from "react";
import { Linking, Pressable, Text, View } from "react-native";
import type { PublicConfig } from "../types";
import { Button, styles } from "../ui";
import { colors, radii, spacing } from "../theme";

type ConsentKey = "personal_data" | "user_agreement" | "marketing";

type ConsentLink = {
  label: string;
  url: string;
};

type ConsentBlock = {
  key: ConsentKey;
  text: string;
  required: boolean;
  links: ConsentLink[];
};

type ConsentConfigItem = PublicConfig["consents"][string];

type Props = {
  consents: PublicConfig["consents"] | undefined;
  onAccept: (accepted: Record<ConsentKey, boolean>) => void;
  onCancel: () => void;
};

const LABELS: Record<ConsentKey, {
  text: string;
  links: Array<{ label: string; readUrl: (item: ConsentConfigItem) => string | null | undefined }>;
}> = {
  personal_data: {
    text: "Я ознакомлен с Политикой обработки персональных данных ООО «ХАН» и даю своё Согласие на обработку моих персональных данных",
    links: [
      { label: "Согласие на обработку ПД", readUrl: (item) => item.document_url },
      { label: "Политика обработки ПД", readUrl: (item) => item.privacy_policy_document_url },
    ],
  },
  user_agreement: {
    text: "Я прочитал и соглашаюсь с Пользовательским соглашением",
    links: [{ label: "Пользовательское соглашение", readUrl: (item) => item.document_url }],
  },
  marketing: {
    text: "Я даю своё согласие на получение рекламных и маркетинговых коммуникаций",
    links: [{ label: "Условия получения коммуникаций", readUrl: (item) => item.document_url }],
  },
};

export function ConsentModal({ consents, onAccept, onCancel }: Props) {
  const blocks = useMemo(() => buildBlocks(consents), [consents]);
  const [checked, setChecked] = useState<Record<ConsentKey, boolean>>({
    personal_data: false,
    user_agreement: false,
    marketing: false,
  });

  const requiredDone = blocks.length > 0
    && blocks.filter((block) => block.required).every((block) => checked[block.key]);

  const toggle = (key: ConsentKey) => {
    setChecked((prev) => ({ ...prev, [key]: !prev[key] }));
  };

  return (
    <View accessibilityViewIsModal style={styles.modalBackdrop}>
      <View style={[styles.modal, { maxWidth: 400, gap: spacing.lg }]}>
        <View style={{ gap: spacing.sm }}>
          <View style={consentStyles.iconWrap}>
            <Text style={consentStyles.iconGlyph}>✓</Text>
          </View>
          <Text accessibilityRole="header" style={[styles.title, { fontSize: 22 }]}>
            Перед началом работы
          </Text>
          <Text style={styles.muted}>
            Для использования приложения ознакомьтесь со следующими документами и предоставьте необходимые согласия
          </Text>
        </View>

        <View style={{ gap: spacing.md }}>
          {blocks.map((block) => {
            const isChecked = checked[block.key];
            return (
              <Pressable
                key={block.key}
                accessibilityRole="checkbox"
                accessibilityState={{ checked: isChecked }}
                onPress={() => toggle(block.key)}
                style={[
                  consentStyles.card,
                  isChecked ? consentStyles.cardChecked : null,
                ]}
              >
                <View style={consentStyles.cardRow}>
                  <View
                    style={[
                      consentStyles.checkbox,
                      isChecked ? consentStyles.checkboxChecked : null,
                    ]}
                  >
                    {isChecked ? <Text style={consentStyles.checkMark}>✓</Text> : null}
                  </View>
                  <View style={{ flex: 1, gap: spacing.sm }}>
                    <Text style={styles.text}>
                      {block.text}
                      {block.required ? <Text style={{ color: colors.destructive }}> *</Text> : null}
                    </Text>
                    {block.links.length > 0 ? (
                      <View style={consentStyles.links}>
                        {block.links.map((link) => (
                          <Pressable
                            key={link.url}
                            accessibilityRole="link"
                            onPress={(event) => {
                              event?.stopPropagation?.();
                              void Linking.openURL(link.url);
                            }}
                          >
                            <Text style={consentStyles.link}>↗ {link.label}</Text>
                          </Pressable>
                        ))}
                      </View>
                    ) : null}
                  </View>
                </View>
              </Pressable>
            );
          })}
          <Text style={styles.muted}>
            <Text style={{ color: colors.destructive }}>*</Text>
            {" — обязательные согласия"}
          </Text>
        </View>

        <View style={{ gap: spacing.sm }}>
          <Button
            title="Продолжить"
            disabled={!requiredDone}
            onPress={() => onAccept(checked)}
          />
          <Button title="Отмена" secondary onPress={onCancel} />
        </View>
      </View>
    </View>
  );
}

function buildBlocks(consents: PublicConfig["consents"] | undefined): ConsentBlock[] {
  return (Object.keys(LABELS) as ConsentKey[]).flatMap((key) => {
    const item = consents?.[key];
    if (!item) return [];
    const meta = LABELS[key];
    const links = meta.links.flatMap((link) => {
      const url = link.readUrl(item);
      return url ? [{ label: link.label, url }] : [];
    });
    return [{
      key,
      text: meta.text,
      required: item.required,
      links,
    }];
  });
}

const consentStyles = {
  iconWrap: {
    width: 48,
    height: 48,
    borderRadius: 16,
    backgroundColor: "rgba(3, 2, 19, 0.08)",
    alignItems: "center" as const,
    justifyContent: "center" as const,
    marginBottom: spacing.xs,
  },
  iconGlyph: {
    color: colors.primary,
    fontSize: 22,
    fontWeight: "700" as const,
  },
  card: {
    borderWidth: 1,
    borderColor: colors.border,
    borderRadius: radii.xl,
    backgroundColor: colors.card,
    padding: spacing.md,
  },
  cardChecked: {
    borderColor: "rgba(3, 2, 19, 0.3)",
    backgroundColor: "rgba(3, 2, 19, 0.04)",
  },
  cardRow: {
    flexDirection: "row" as const,
    alignItems: "flex-start" as const,
    gap: spacing.md,
  },
  checkbox: {
    width: 20,
    height: 20,
    borderRadius: radii.sm,
    borderWidth: 2,
    borderColor: colors.border,
    backgroundColor: colors.background,
    alignItems: "center" as const,
    justifyContent: "center" as const,
    marginTop: 2,
  },
  checkboxChecked: {
    borderColor: colors.primary,
    backgroundColor: colors.primary,
  },
  checkMark: {
    color: colors.primaryForeground,
    fontSize: 12,
    fontWeight: "700" as const,
    lineHeight: 14,
  },
  links: {
    flexDirection: "row" as const,
    flexWrap: "wrap" as const,
    gap: spacing.sm,
  },
  link: {
    color: colors.primary,
    fontSize: 12,
    textDecorationLine: "underline" as const,
  },
};