import { Ionicons } from "@expo/vector-icons";
import { Pressable, StyleSheet, Text, TextInput, View } from "react-native";

import { CompactDateField } from "@/components/ui/CompactDateField";
import { CompactStepperInput } from "@/components/ui/CompactStepperInput";
import { fonts, radii, spacing } from "@/constants/theme";
import { useAppTheme } from "@/contexts/ThemeContext";
import { formatCurrency, formatShortDate } from "@/lib/format";

export type EditableLineItem = {
  id?: string;
  date: Date;
  description: string;
  hours: string;
  rate: string;
};

type LineItemEditorProps = {
  item: EditableLineItem;
  index: number;
  currency: string;
  onChange: (patch: Partial<EditableLineItem>) => void;
  onRemove: () => void;
  readOnly?: boolean;
  isLast?: boolean;
};

export function LineItemsTableHeader() {
  const { colors } = useAppTheme();

  return (
    <View style={[headerStyles.row, { borderBottomColor: colors.border }]}>
      <Text style={[headerStyles.cell, headerStyles.desc, { color: colors.mutedForeground }]}>
        Description
      </Text>
      <Text style={[headerStyles.cell, headerStyles.date, { color: colors.mutedForeground }]}>
        Date
      </Text>
      <Text style={[headerStyles.cell, headerStyles.hours, { color: colors.mutedForeground }]}>
        Hrs
      </Text>
      <Text style={[headerStyles.cell, headerStyles.rate, { color: colors.mutedForeground }]}>
        Rate
      </Text>
      <Text style={[headerStyles.cell, headerStyles.amt, { color: colors.mutedForeground }]}>
        Amt
      </Text>
      <View style={headerStyles.spacer} />
    </View>
  );
}

export function LineItemEditor({
  item,
  index,
  currency,
  onChange,
  onRemove,
  readOnly = false,
  isLast = false,
}: LineItemEditorProps) {
  const { colors } = useAppTheme();
  const hours = Number(item.hours) || 0;
  const rate = Number(item.rate) || 0;
  const amount = hours * rate;

  if (readOnly) {
    return (
      <View
        style={[
          styles.row,
          !isLast && { borderBottomColor: colors.border, borderBottomWidth: 1 },
        ]}
      >
        <Text style={[styles.index, { color: colors.mutedForeground }]}>{index + 1}</Text>
        <View style={styles.descCol}>
          <Text style={[styles.readTitle, { color: colors.foreground }]} numberOfLines={2}>
            {item.description.trim() || "Untitled line"}
          </Text>
          <Text style={[styles.readSub, { color: colors.mutedForeground }]}>
            {formatShortDate(item.date)} · {hours}h × {formatCurrency(rate, currency)}
          </Text>
        </View>
        <Text style={[styles.amount, { color: colors.foreground }]}>
          {formatCurrency(amount, currency)}
        </Text>
      </View>
    );
  }

  return (
    <View
      style={[
        styles.editBlock,
        !isLast && { borderBottomColor: colors.border, borderBottomWidth: 1 },
      ]}
    >
      <View style={styles.editTop}>
        <Text style={[styles.index, { color: colors.mutedForeground }]}>{index + 1}</Text>
        <TextInput
          value={item.description}
          onChangeText={(description) => onChange({ description })}
          placeholder="What was done?"
          placeholderTextColor={colors.mutedForeground}
          style={[
            styles.descriptionInput,
            {
              color: colors.foreground,
              borderColor: colors.border,
              backgroundColor: colors.cardGlass,
            },
          ]}
        />
      </View>

      <View style={styles.metricsRow}>
        <CompactDateField
          value={item.date}
          onChange={(date) => onChange({ date })}
          style={styles.dateField}
        />
        <CompactStepperInput
          value={item.hours}
          onChangeText={(hours) => onChange({ hours })}
          step={0.25}
          style={styles.hoursField}
        />
        <View style={[styles.rateField, { borderColor: colors.border, backgroundColor: colors.cardGlass }]}>
          <Text style={[styles.ratePrefix, { color: colors.mutedForeground }]}>$</Text>
          <TextInput
            value={item.rate}
            onChangeText={(rate) => onChange({ rate })}
            keyboardType="decimal-pad"
            placeholder="0"
            placeholderTextColor={colors.mutedForeground}
            style={[styles.rateInput, { color: colors.foreground }]}
          />
        </View>
        <Text style={[styles.amount, styles.amountEdit, { color: colors.foreground }]}>
          {formatCurrency(amount, currency)}
        </Text>
        <Pressable
          accessibilityRole="button"
          accessibilityLabel="Remove line item"
          onPress={onRemove}
          hitSlop={8}
          style={({ pressed }) => [styles.remove, pressed && styles.removePressed]}
        >
          <Ionicons name="trash-outline" size={17} color={colors.destructive} />
        </Pressable>
      </View>
    </View>
  );
}

const headerStyles = StyleSheet.create({
  row: {
    flexDirection: "row",
    alignItems: "center",
    gap: spacing.xs,
    paddingBottom: spacing.xs,
    marginBottom: spacing.xs,
    borderBottomWidth: 1,
  },
  cell: {
    fontFamily: fonts.bodySemiBold,
    fontSize: 11,
    textTransform: "uppercase",
    letterSpacing: 0.4,
  },
  desc: { flex: 1, paddingLeft: 22 },
  date: { width: 72 },
  hours: { width: 88, textAlign: "center" },
  rate: { width: 72, textAlign: "center" },
  amt: { width: 64, textAlign: "right" },
  spacer: { width: 32 },
});

const styles = StyleSheet.create({
  row: {
    flexDirection: "row",
    alignItems: "center",
    gap: spacing.xs,
    paddingVertical: spacing.sm,
  },
  editBlock: {
    paddingVertical: spacing.sm,
    gap: spacing.xs,
  },
  editTop: {
    flexDirection: "row",
    alignItems: "center",
    gap: spacing.xs,
  },
  index: {
    width: 18,
    fontFamily: fonts.bodySemiBold,
    fontSize: 12,
    textAlign: "center",
  },
  descCol: {
    flex: 1,
    gap: 2,
  },
  readTitle: {
    fontFamily: fonts.bodyMedium,
    fontSize: 14,
    lineHeight: 18,
  },
  readSub: {
    fontFamily: fonts.body,
    fontSize: 11,
  },
  descriptionInput: {
    flex: 1,
    minHeight: 36,
    borderWidth: 1,
    borderRadius: radii.md,
    paddingHorizontal: spacing.sm,
    fontFamily: fonts.body,
    fontSize: 14,
    paddingVertical: 6,
  },
  metricsRow: {
    flexDirection: "row",
    alignItems: "center",
    gap: spacing.xs,
    paddingLeft: 22,
  },
  dateField: {
    width: 72,
  },
  hoursField: {
    width: 88,
  },
  rateField: {
    width: 72,
    flexDirection: "row",
    alignItems: "center",
    borderWidth: 1,
    borderRadius: radii.md,
    minHeight: 36,
    paddingHorizontal: spacing.xs,
  },
  ratePrefix: {
    fontFamily: fonts.body,
    fontSize: 13,
  },
  rateInput: {
    flex: 1,
    fontFamily: fonts.body,
    fontSize: 13,
    paddingVertical: 4,
    textAlign: "right",
  },
  amount: {
    width: 64,
    fontFamily: fonts.bodySemiBold,
    fontSize: 13,
    textAlign: "right",
  },
  amountEdit: {
    fontSize: 12,
  },
  remove: {
    width: 32,
    height: 36,
    alignItems: "center",
    justifyContent: "center",
  },
  removePressed: {
    opacity: 0.65,
  },
});