import { useState } from 'react';
import { faPenToSquare } from '@fortawesome/pro-duotone-svg-icons';
import { faIcon } from '@/lib/icon-wrapper';
import { SlideoutMenu } from '@/components/application/slideout-menus/slideout-menu';
import { Input } from '@/components/base/input/input';
import { Select } from '@/components/base/select/select';
import { Button } from '@/components/base/buttons/button';
import { apiClient } from '@/lib/api-client';
import { notify } from '@/lib/toast';
import type { Campaign, CampaignStatus } from '@/types/entities';

const PenIcon = faIcon(faPenToSquare);

type CampaignEditSlideoutProps = {
    isOpen: boolean;
    onOpenChange: (open: boolean) => void;
    campaign: Campaign;
    onSaved?: () => void;
};

const statusItems = [
    { id: 'DRAFT' as const, label: 'Draft' },
    { id: 'ACTIVE' as const, label: 'Active' },
    { id: 'PAUSED' as const, label: 'Paused' },
    { id: 'COMPLETED' as const, label: 'Completed' },
];

const formatDateForInput = (dateStr: string | null): string => {
    if (!dateStr) return '';
    try {
        return new Date(dateStr).toISOString().slice(0, 10);
    } catch {
        return '';
    }
};

const budgetToDisplay = (campaign: Campaign): string => {
    if (!campaign.budget) return '';
    return String(Math.round(campaign.budget.amountMicros / 1_000_000));
};

export const CampaignEditSlideout = ({ isOpen, onOpenChange, campaign, onSaved }: CampaignEditSlideoutProps) => {
    const [campaignName, setCampaignName] = useState(campaign.campaignName ?? '');
    const [status, setStatus] = useState<CampaignStatus | null>(campaign.campaignStatus);
    const [budget, setBudget] = useState(budgetToDisplay(campaign));
    const [startDate, setStartDate] = useState(formatDateForInput(campaign.startDate));
    const [endDate, setEndDate] = useState(formatDateForInput(campaign.endDate));
    const [isSaving, setIsSaving] = useState(false);

    const handleSave = async (close: () => void) => {
        setIsSaving(true);
        try {
            const budgetMicros = budget ? Number(budget) * 1_000_000 : null;

            await apiClient.graphql(
                `mutation UpdateCampaign($id: UUID!, $data: CampaignUpdateInput!) {
                    updateCampaign(id: $id, data: $data) { id }
                }`,
                {
                    id: campaign.id,
                    data: {
                        campaignName: campaignName || null,
                        campaignStatus: status,
                        ...(budgetMicros !== null
                            ? {
                                  budget: {
                                      amountMicros: budgetMicros,
                                      currencyCode: campaign.budget?.currencyCode ?? 'INR',
                                  },
                              }
                            : {}),
                        startDate: startDate ? new Date(startDate).toISOString() : null,
                        endDate: endDate ? new Date(endDate).toISOString() : null,
                    },
                },
            );

            notify.success('Campaign updated', `${campaignName || 'Campaign'} has been updated successfully.`);
            onSaved?.();
            close();
        } catch (err) {
            // apiClient.graphql already toasts on error
            console.error('Failed to update campaign:', err);
        } finally {
            setIsSaving(false);
        }
    };

    return (
        <SlideoutMenu isOpen={isOpen} onOpenChange={onOpenChange} isDismissable>
            {({ close }) => (
                <>
                    <SlideoutMenu.Header onClose={close}>
                        <div className="flex items-center gap-3 pr-8">
                            <div className="flex size-10 items-center justify-center rounded-lg bg-brand-secondary">
                                <PenIcon className="size-5 text-fg-brand-primary" />
                            </div>
                            <div>
                                <h2 className="text-lg font-semibold text-primary">Edit Campaign</h2>
                                <p className="text-sm text-tertiary">Update campaign details</p>
                            </div>
                        </div>
                    </SlideoutMenu.Header>

                    <SlideoutMenu.Content>
                        <div className="flex flex-col gap-4">
                            <Input
                                label="Campaign Name"
                                placeholder="Enter campaign name"
                                value={campaignName}
                                onChange={setCampaignName}
                            />

                            <Select
                                label="Status"
                                placeholder="Select status"
                                items={statusItems}
                                selectedKey={status}
                                onSelectionChange={(key) => setStatus(key as CampaignStatus)}
                            >
                                {(item) => <Select.Item id={item.id} label={item.label} />}
                            </Select>

                            <Input
                                label="Budget (INR)"
                                placeholder="e.g. 50000"
                                type="number"
                                value={budget}
                                onChange={setBudget}
                            />

                            <div className="grid grid-cols-2 gap-3">
                                <Input
                                    label="Start Date"
                                    type="date"
                                    value={startDate}
                                    onChange={setStartDate}
                                />
                                <Input
                                    label="End Date"
                                    type="date"
                                    value={endDate}
                                    onChange={setEndDate}
                                />
                            </div>
                        </div>
                    </SlideoutMenu.Content>

                    <SlideoutMenu.Footer>
                        <div className="flex items-center justify-end gap-3">
                            <Button size="md" color="secondary" onClick={close}>
                                Cancel
                            </Button>
                            <Button
                                size="md"
                                color="primary"
                                isLoading={isSaving}
                                showTextWhileLoading
                                onClick={() => handleSave(close)}
                            >
                                {isSaving ? 'Saving...' : 'Save Changes'}
                            </Button>
                        </div>
                    </SlideoutMenu.Footer>
                </>
            )}
        </SlideoutMenu>
    );
};