"use client"

import { AlertTriangle, Plus, Save } from "lucide-react"

import { Button } from "@/shared/components/ui/button"
import { Alert, AlertTitle } from "@/shared/components/ui/alert"
import { FieldGroup } from "@/shared/components/ui/field"
import {
    Rhform,
    RhfTextField,
    RhfTextareaField,
    RhfSelectField,
    RhfAsyncSelectField,
    RhfCheckboxField,
} from "@/shared/components/form"
import { UnitTypeInlineForm } from "@/modules/services/inline-forms/unit-type-inline-form"
import { DepartmentInlineForm } from "@/modules/services/inline-forms/department-inline-form"
import { toast } from "sonner"
import { useAuthApi } from "@/shared/useApi"
import { useResourceForm } from "@/shared/hooks/use-resource-form"
import { useFormMutation } from "@/shared/hooks/use-form-mutation"
import { toRelation, toId } from "@/shared/lib/utils"

import { expenseItemFormSchema, type ExpenseItemFormValues } from "./expense-item.schema"
import {
    EXPENSE_ITEM_ROUTES,
    INVENTORY_CATEGORY_ROUTES,
    INVENTORY_ROUTES,
    DEPARTMENT_ROUTES,
} from "@garage/api"
import { InventoryCategoryCrudDialog } from "./inventory-category-crud-dialog"
import { RhfVendorSelectField } from "@/modules/vendors/rhf-vendor-select-field"

// ── Constants ──

const ITEM_TYPE_OPTIONS = [
    { value: "Expense", label: "Expense" },
]

const mapLookupOption = (item: any) => ({
    value: String(item.id),
    label: item.title ?? item.name ?? String(item.id),
})

const STORE_OBJECT = { getOptionValue: (o: any) => o, getOptionLabel: (o: any) => o.label }

// ── Props ──

export type ExpenseItemFormProps = {
    resourceId?: string | null
    initialData?: unknown
    onSuccess?: () => void
}

// ── Default values ──

const DEFAULT_VALUES: ExpenseItemFormValues = {
    item_type: "Expense",
    item_name: "",
    sku: "",
    item_code: "",
    description: "",
    category: null,
    unit_type: null,
    department: null,
    purchase_information: true,
    purchase_price: undefined,
    purchase_chart_of_account: "",
    purchase_preferred_vendor: null,
    sales_information: false,
    selling_price: undefined,
    sales_chart_of_account: "",
    is_active: true,
}

// ── Mapping helpers ──

function mapToFormValues(data: unknown): ExpenseItemFormValues {
    const d = (data as any)?.data ?? data ?? {}

    return {
        item_type: d.item_type || "Expense",
        item_name: d.item_name || "",
        sku: d.sku || "",
        item_code: d.item_code || "",
        description: d.description || "",
        category: toRelation(
            d.category_id ?? d.category?.id,
            d.category_title ?? d.category_name ?? d.category?.title ?? d.category?.name,
        ),
        unit_type: toRelation(
            d.unit_type_id ?? d.unit_type?.id,
            d.unit_type_title ?? d.unit_type_name ?? d.unit_type?.title ?? d.unit_type?.name,
        ),
        department: toRelation(
            d.department_id ?? d.department?.id,
            d.department_name ?? d.department_title ?? d.department?.name ?? d.department?.title,
        ),
        purchase_information: d.purchase_information ?? true,
        purchase_price: d.purchase_price ?? undefined,
        purchase_chart_of_account: d.purchase_chart_of_account || "",
        purchase_preferred_vendor: toRelation(
            d.purchase_preferred_vendor_id ?? d.purchase_preferred_vendor?.id,
            d.purchase_preferred_vendor_name
                ?? d.purchase_preferred_vendor?.company_name
                ?? [d.purchase_preferred_vendor?.first_name, d.purchase_preferred_vendor?.last_name].filter(Boolean).join(" "),
        ),
        sales_information: d.sales_information ?? false,
        selling_price: d.selling_price ?? undefined,
        sales_chart_of_account: d.sales_chart_of_account || "",
        is_active: d.is_active ?? true,
    }
}

function mapFormToPayload(values: ExpenseItemFormValues) {
    return {
        item_type: values.item_type,
        item_name: values.item_name,
        sku: values.sku || undefined,
        item_code: values.item_code || undefined,
        description: values.description || undefined,
        category_id: toId(values.category),
        unit_type_id: toId(values.unit_type),
        department_id: toId(values.department),
        purchase_information: values.purchase_information,
        purchase_price: values.purchase_price,
        purchase_chart_of_account: values.purchase_chart_of_account || undefined,
        purchase_preferred_vendor_id: toId(values.purchase_preferred_vendor),
        sales_information: values.sales_information,
        selling_price: values.selling_price,
        sales_chart_of_account: values.sales_chart_of_account || undefined,
        is_active: values.is_active,
    }
}

// ── Component ──

export function ExpenseItemForm({ resourceId, initialData, onSuccess }: ExpenseItemFormProps) {
    const api = useAuthApi()

    const { form, isEditing, invalidate } = useResourceForm<ExpenseItemFormValues, any>({
        schema: expenseItemFormSchema,
        defaultValues: DEFAULT_VALUES,
        resourceId,
        initialData,
        initialize: (id) => api.expenseItems.show(id),
        queryKey: [EXPENSE_ITEM_ROUTES.BY_ID, resourceId],
        mapToFormValues,
    })

    const { mutate, error, isPending } = useFormMutation(form, {
        mutationFn: (values: ExpenseItemFormValues) => {
            const promise = isEditing && resourceId
                ? api.expenseItems.update(resourceId, mapFormToPayload(values))
                : api.expenseItems.create(mapFormToPayload(values))
            toast.promise(promise, {
                loading: isEditing ? "Updating expense item..." : "Creating expense item...",
                success: isEditing ? "Expense item updated successfully" : "Expense item created successfully",
                error: isEditing ? "Failed to update expense item" : "Failed to create expense item",
            })
            return promise
        },
        onSuccess: () => {
            if (!isEditing) form.reset()
            onSuccess?.()
        },
    })

    return (
        <Rhform form={form} onSubmit={(values) => mutate(values)}>
            {error && (
                <Alert variant="destructive" className="mb-4">
                    <AlertTriangle className="me-2 h-4 w-4" />
                    <AlertTitle>
                        {isEditing ? "Failed to update expense item" : "Failed to create expense item"}
                    </AlertTitle>
                    {error.message}
                </Alert>
            )}

            <FieldGroup>
                {/* Basic Info */}
                <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
                    <RhfSelectField
                        name="item_type"
                        label="Item Type"
                        options={ITEM_TYPE_OPTIONS}
                        required
                    />
                    <RhfTextField
                        name="item_name"
                        label="Item Name"
                        placeholder="e.g. Office Supplies"
                        required
                    />
                </div>

                <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
                    <RhfTextField
                        name="sku"
                        label="SKU"
                        placeholder="e.g. EXP-001"
                    />
                    <RhfTextField
                        name="item_code"
                        label="Item Code"
                        placeholder="e.g. EXP-001"
                    />
                </div>

                <RhfTextareaField
                    name="description"
                    label="Description"
                    placeholder="Optional description"
                    rows={3}
                />

                {/* Classification */}
                <div>
                    <div className="mb-1 flex items-center justify-between">
                        <span className="text-sm font-medium">Category</span>
                        <InventoryCategoryCrudDialog />
                    </div>
                    <RhfAsyncSelectField
                        name="category"
                        label=""
                        placeholder="Select category"
                        queryKey={[INVENTORY_CATEGORY_ROUTES.INDEX]}
                        listFn={() => api.inventoryCategories.list()}
                        mapOption={mapLookupOption}
                        {...STORE_OBJECT}
                    />
                </div>

                <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
                    <RhfAsyncSelectField
                        name="unit_type"
                        label="Unit Type"
                        placeholder="Select unit type"
                        queryKey={[INVENTORY_ROUTES.UNIT_TYPES]}
                        listFn={() => api.inventory.listUnitTypes()}
                        mapOption={mapLookupOption}
                        createForm={(props) => <UnitTypeInlineForm {...props} />}
                        createLabel="Unit Type"
                        {...STORE_OBJECT}
                    />
                    <RhfAsyncSelectField
                        name="department"
                        label="Department"
                        placeholder="Select department"
                        queryKey={[DEPARTMENT_ROUTES.INDEX]}
                        listFn={() => api.departments.list()}
                        mapOption={(item: any) => ({ value: String(item.id), label: item.name ?? String(item.id) })}
                        createForm={(props) => <DepartmentInlineForm {...props} />}
                        createLabel="Department"
                        {...STORE_OBJECT}
                    />
                </div>

                {/* Purchase Information */}
                <RhfCheckboxField
                    name="purchase_information"
                    label="Purchase Information"
                />

                <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
                    <RhfTextField
                        name="purchase_price"
                        label="Purchase Price"
                        placeholder="0.00"
                        type="number"
                    />
                    {/* TODO(phase-2): wire Purchase Chart of Account to the chart-of-accounts module (currently disabled, marked "Coming soon"). */}
                    <RhfTextField
                        name="purchase_chart_of_account"
                        label="Purchase Chart of Account"
                        placeholder="e.g. Expenses"
                        description="Coming soon"
                        disabled
                    />
                </div>

                <RhfVendorSelectField
                    name="purchase_preferred_vendor"
                    label="Preferred Vendor"
                    placeholder="Select vendor"
                />

                {/* Sales Information */}
                {/* <RhfCheckboxField
                    name="sales_information"
                    label="Sales Information"
                />

                <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
                    <RhfTextField
                        name="selling_price"
                        label="Selling Price"
                        placeholder="0.00"
                        type="number"
                    />
                    <RhfTextField
                        name="sales_chart_of_account"
                        label="Sales Chart of Account"
                        placeholder="e.g. Revenue"
                    />
                </div> */}

                {/* Status */}
                <RhfCheckboxField
                    name="is_active"
                    label="Active"
                />
            </FieldGroup>

            <div className="mt-6 flex justify-end">
                <Button type="submit" disabled={isPending}>
                    {isEditing ? (
                        <>
                            <Save className="me-2 h-4 w-4" />
                            {isPending ? "Saving..." : "Save Changes"}
                        </>
                    ) : (
                        <>
                            <Plus className="me-2 h-4 w-4" />
                            {isPending ? "Creating..." : "Create Expense Item"}
                        </>
                    )}
                </Button>
            </div>
        </Rhform>
    )
}