"use client"

import { useRef, useState } from "react"
import { useQuery } from "@tanstack/react-query"
import { Loader2 } from "lucide-react"
import { useAuthApi } from "@/shared/useApi"
import { EMPLOYEE_ROUTES } from "@garage/api"
import { Badge } from "@/shared/components/ui/badge"
import { formatEnum } from "@/shared/utils/formatters"
import {
    Combobox,
    ComboboxInput,
    ComboboxContent,
    ComboboxList,
    ComboboxItem,
    ComboboxEmpty,
} from "@/shared/components/ui/combobox"

// ── Types ──

export type EmployeeOption = {
    value: string
    label: string
    first_name?: string
    last_name?: string
    email?: string
    type?: string
    status?: string
}

// ── Helpers ──

function buildEmployeeOption(item: any): EmployeeOption {
    const label =
        [item.first_name, item.last_name].filter(Boolean).join(" ") ||
        `Employee #${item.id}`
    return {
        value: String(item.id),
        label,
        first_name: item.first_name,
        last_name: item.last_name,
        email: item.email,
        type: item.type,
        status: item.status,
    }
}

function extractItems(response: unknown): any[] {
    if (Array.isArray(response)) return response
    const obj = response as any
    if (Array.isArray(obj?.data?.data)) return obj.data.data
    if (Array.isArray(obj?.data)) return obj.data
    return []
}

function getInitials(opt: EmployeeOption): string {
    return (
        [opt.first_name?.[0], opt.last_name?.[0]].filter(Boolean).join("").toUpperCase() || "E"
    )
}

// ── Props ──

type EmployeeComboboxProps = {
    value?: EmployeeOption | null
    onValueChange: (employee: EmployeeOption | null) => void
    disabled?: boolean
    placeholder?: string
    showClear?: boolean
    onBlur?: () => void
    "aria-invalid"?: boolean
}

// ── Component ──

export function EmployeeCombobox({
    value,
    onValueChange,
    disabled,
    placeholder = "Search by name or email...",
    showClear,
    onBlur,
    "aria-invalid": ariaInvalid,
}: EmployeeComboboxProps) {
    const api = useAuthApi()
    const anchorRef = useRef<HTMLDivElement>(null)
    const [inputValue, setInputValue] = useState("")

    const { data: options = [], isLoading } = useQuery<EmployeeOption[]>({
        queryKey: [EMPLOYEE_ROUTES.INDEX, "employee-select"],
        queryFn: async () => {
            const res = await api.employees.list()
            return extractItems(res).map(buildEmployeeOption)
        },
        staleTime: 5 * 60 * 1000,
    })

    const filtered = inputValue
        ? options.filter((e) =>
              [e.first_name, e.last_name, e.email, e.type]
                  .filter(Boolean)
                  .join(" ")
                  .toLowerCase()
                  .includes(inputValue.toLowerCase()),
          )
        : options

    return (
        <div ref={anchorRef}>
            <Combobox
                value={value}
                onValueChange={(val: EmployeeOption | EmployeeOption[] | null) => {
                    const single = Array.isArray(val) ? val[0] ?? null : val
                    onValueChange(single)
                }}
                disabled={disabled}
                onInputValueChange={(val: string, { reason }: { reason: string }) => {
                    if (reason === "input-change") setInputValue(val)
                }}
                isItemEqualToValue={(item: EmployeeOption, val: any) =>
                    item?.value === val?.value
                }
            >
                <ComboboxInput
                    placeholder={placeholder}
                    showClear={showClear ?? !!value}
                    onBlur={onBlur}
                    aria-invalid={ariaInvalid || undefined}
                />
                <ComboboxContent anchor={anchorRef}>
                    <ComboboxList>
                        {isLoading && (
                            <div className="flex items-center justify-center py-6">
                                <Loader2 className="size-4 animate-spin text-muted-foreground" />
                            </div>
                        )}

                        {!isLoading &&
                            filtered.map((opt) => (
                                <ComboboxItem key={opt.value} value={opt}>
                                    <div className="flex items-center gap-3 py-0.5 w-full min-w-0">
                                        <div className="flex size-9 shrink-0 items-center justify-center rounded-full bg-primary/10 text-primary border border-border text-sm font-medium">
                                            {getInitials(opt)}
                                        </div>
                                        <div className="flex min-w-0 flex-1 flex-col gap-0.5">
                                            <span className="truncate text-sm font-medium leading-none">
                                                {opt.label}
                                            </span>
                                            <div className="flex items-center gap-1.5">
                                                {opt.type && (
                                                    <Badge
                                                        variant="secondary"
                                                        className="h-4 px-1.5 text-xs font-normal"
                                                    >
                                                        {formatEnum(opt.type)}
                                                    </Badge>
                                                )}
                                                {opt.status && (
                                                    <span
                                                        className={`text-xs ${opt.status === "active" ? "text-green-600 dark:text-green-400" : "text-muted-foreground"}`}
                                                    >
                                                        {formatEnum(opt.status)}
                                                    </span>
                                                )}
                                            </div>
                                        </div>
                                    </div>
                                </ComboboxItem>
                            ))}

                        {!isLoading && filtered.length === 0 && (
                            <ComboboxEmpty>No employees found</ComboboxEmpty>
                        )}
                    </ComboboxList>
                </ComboboxContent>
            </Combobox>
        </div>
    )
}
