import { Pressable, StyleSheet, Text, View } from "react-native";

import { DateTimeField } from "@/components/ui/DateTimeField";
import { Input } from "@/components/ui/Input";
import { SelectField } from "@/components/ui/SelectField";
import { fonts, spacing } from "@/constants/theme";
import { useAppTheme } from "@/contexts/ThemeContext";
import { defaultDueDate } from "@/lib/invoice-number";

type SelectOption = { label: string; value: string };

type InvoiceSetupFormProps = {
  businessId: string;
  onBusinessIdChange: (value: string) => void;
  businessOptions: SelectOption[];
  businessError?: string;
  businessReadOnly?: boolean;
  clientId: string;
  onClientIdChange: (value: string) => void;
  clientOptions: SelectOption[];
  clientError?: string;
  clientReadOnly?: boolean;
  invoiceNumber: string;
  onInvoiceNumberChange?: (value: string) => void;
  invoiceNumberReadOnly?: boolean;
  issueDate: Date;
  onIssueDateChange?: (date: Date) => void;
  issueDateReadOnly?: boolean;
  dueDate: Date;
  onDueDateChange: (date: Date) => void;
  taxRate: string;
  onTaxRateChange?: (value: string) => void;
  taxRateReadOnly?: boolean;
  notes: string;
  onNotesChange: (value: string) => void;
  sendReminderAt?: Date | null;
  onSendReminderAtChange?: (date: Date | null) => void;
  showSendReminder?: boolean;
};

export function InvoiceSetupForm({
  businessId,
  onBusinessIdChange,
  businessOptions,
  businessError,
  businessReadOnly = false,
  clientId,
  onClientIdChange,
  clientOptions,
  clientError,
  clientReadOnly = false,
  invoiceNumber,
  onInvoiceNumberChange,
  invoiceNumberReadOnly = false,
  issueDate,
  onIssueDateChange,
  issueDateReadOnly = false,
  dueDate,
  onDueDateChange,
  taxRate,
  onTaxRateChange,
  taxRateReadOnly = false,
  notes,
  onNotesChange,
  sendReminderAt,
  onSendReminderAtChange,
  showSendReminder = false,
}: InvoiceSetupFormProps) {
  const { colors } = useAppTheme();

  return (
    <View style={styles.form}>
      {businessOptions.length === 0 ? (
        <Text style={[styles.hint, { color: colors.mutedForeground }]}>
          Add a business in Entities before invoicing.
        </Text>
      ) : (
        <SelectField
          label="Business"
          placeholder="Select business…"
          value={businessId}
          options={businessOptions}
          required
          error={businessError}
          disabled={businessReadOnly}
          onValueChange={onBusinessIdChange}
        />
      )}

      {clientOptions.length === 0 ? (
        <Text style={[styles.hint, { color: colors.mutedForeground }]}>
          Add a client in Entities before invoicing.
        </Text>
      ) : (
        <SelectField
          label="Client"
          placeholder="Select client…"
          value={clientId}
          options={clientOptions}
          required
          error={clientError}
          disabled={clientReadOnly}
          onValueChange={onClientIdChange}
        />
      )}

      {invoiceNumberReadOnly ? (
        <View style={styles.readOnlyField}>
          <Text style={[styles.readOnlyLabel, { color: colors.mutedForeground }]}>
            Invoice number
          </Text>
          <Text style={[styles.readOnlyValue, { color: colors.foreground }]}>
            {invoiceNumber}
          </Text>
        </View>
      ) : (
        <Input
          label="Invoice number"
          value={invoiceNumber}
          onChangeText={onInvoiceNumberChange}
          autoCapitalize="characters"
          required
        />
      )}

      {issueDateReadOnly ? (
        <View style={styles.readOnlyField}>
          <Text style={[styles.readOnlyLabel, { color: colors.mutedForeground }]}>
            Issue date
          </Text>
          <Text style={[styles.readOnlyValue, { color: colors.foreground }]}>
            {issueDate.toLocaleDateString()}
          </Text>
        </View>
      ) : (
        <DateTimeField
          label="Issue date"
          mode="date"
          value={issueDate}
          onChange={(date) => {
            onIssueDateChange?.(date);
            if (dueDate < date) onDueDateChange(defaultDueDate(date));
          }}
        />
      )}

      <DateTimeField label="Due date" mode="date" value={dueDate} onChange={onDueDateChange} />

      {taxRateReadOnly ? (
        <View style={styles.readOnlyField}>
          <Text style={[styles.readOnlyLabel, { color: colors.mutedForeground }]}>
            Tax rate
          </Text>
          <Text style={[styles.readOnlyValue, { color: colors.foreground }]}>
            {taxRate}%
          </Text>
        </View>
      ) : (
        <Input
          label="Tax rate (%)"
          value={taxRate}
          onChangeText={onTaxRateChange}
          keyboardType="decimal-pad"
        />
      )}

      {showSendReminder && onSendReminderAtChange ? (
        <>
          <DateTimeField
            label="Remind me to send"
            mode="date"
            value={sendReminderAt ?? dueDate}
            minimumDate={new Date()}
            maximumDate={new Date(2100, 0, 1)}
            onChange={onSendReminderAtChange}
          />
          {sendReminderAt ? (
            <Pressable onPress={() => onSendReminderAtChange(null)}>
              <Text style={[styles.clearReminder, { color: colors.primary }]}>
                Clear send reminder
              </Text>
            </Pressable>
          ) : null}
        </>
      ) : null}

      <Input
        label="Notes"
        value={notes}
        onChangeText={onNotesChange}
        placeholder="Optional notes for the client"
        multiline
        style={styles.notesInput}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  form: {
    gap: spacing.sm,
  },
  hint: {
    fontFamily: fonts.body,
    fontSize: 14,
    lineHeight: 20,
  },
  readOnlyField: {
    gap: 4,
    paddingVertical: 4,
  },
  readOnlyLabel: {
    fontFamily: fonts.bodyMedium,
    fontSize: 13,
  },
  readOnlyValue: {
    fontFamily: fonts.body,
    fontSize: 15,
  },
  notesInput: {
    minHeight: 72,
    textAlignVertical: "top",
  },
  clearReminder: {
    fontFamily: fonts.bodyMedium,
    fontSize: 13,
    marginBottom: spacing.xs,
  },
});