import { useMemo } from 'react';
import { Link } from 'react-router';

import { formatCurrency } from '@/lib/format';
import { cx } from '@/utils/cx';
import type { Campaign } from '@/types/entities';

interface CampaignRoiCardsProps {
    campaigns: Campaign[];
}

type CampaignWithCac = Campaign & {
    cac: number;
    conversionRate: number;
    budgetProgress: number;
};

export const CampaignRoiCards = ({ campaigns }: CampaignRoiCardsProps) => {
    const sorted = useMemo((): CampaignWithCac[] => {
        return campaigns
            .map((campaign) => {
                const spent = campaign.amountSpent?.amountMicros ?? 0;
                const converted = campaign.convertedCount ?? 0;
                const leadCount = campaign.leadCount ?? 0;
                const budgetMicros = campaign.budget?.amountMicros ?? 1;

                const cac = converted > 0 ? spent / converted : Infinity;
                const conversionRate = leadCount > 0 ? converted / leadCount : 0;
                const budgetProgress = budgetMicros > 0 ? spent / budgetMicros : 0;

                return { ...campaign, cac, conversionRate, budgetProgress };
            })
            .sort((a, b) => a.cac - b.cac);
    }, [campaigns]);

    const getHealthColor = (rate: number): string => {
        if (rate >= 0.1) return 'bg-success-500';
        if (rate >= 0.05) return 'bg-warning-500';
        return 'bg-error-500';
    };

    return (
        <div className="space-y-3">
            <h3 className="text-sm font-bold text-primary">Campaign ROI</h3>
            <div className="flex gap-4 overflow-x-auto pb-1">
                {sorted.map((campaign) => (
                    <div
                        key={campaign.id}
                        className="min-w-[220px] flex-shrink-0 rounded-xl border border-secondary bg-primary p-4"
                    >
                        <div className="flex items-center gap-2">
                            <span
                                className={cx('size-2 shrink-0 rounded-full', getHealthColor(campaign.conversionRate))}
                            />
                            <span className="truncate text-sm font-semibold text-primary">
                                {campaign.campaignName}
                            </span>
                        </div>

                        <div className="mt-3 flex items-center gap-3 text-xs text-tertiary">
                            <span>{campaign.leadCount ?? 0} leads</span>
                            <span className="text-quaternary">|</span>
                            <span>{campaign.convertedCount ?? 0} converted</span>
                        </div>

                        <div className="mt-2">
                            <span className="text-sm font-bold text-primary">
                                {campaign.cac === Infinity
                                    ? '—'
                                    : formatCurrency(campaign.cac)}
                            </span>
                            <span className="ml-1 text-xs text-tertiary">CAC</span>
                        </div>

                        <div className="mt-3 h-1 w-full overflow-hidden rounded-full bg-tertiary">
                            <div
                                className="h-full rounded-full bg-brand-solid"
                                style={{ width: `${Math.min(campaign.budgetProgress * 100, 100)}%` }}
                            />
                        </div>
                        <span className="mt-1 block text-xs text-quaternary">
                            {Math.round(campaign.budgetProgress * 100)}% budget used
                        </span>
                    </div>
                ))}
            </div>

            <Link to="/campaigns" className="text-sm font-medium text-brand-secondary hover:text-brand-secondary_hover">
                View All Campaigns &rarr;
            </Link>
        </div>
    );
};