"use client"

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

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,
    RhfAsyncSelectField,
} from "@/shared/components/form"
import { DepartmentInlineForm } from "@/modules/services/inline-forms/department-inline-form"
import { toast } from "sonner"
import { useAuthApi } from "@/shared/useApi"
import { formatTaxLabel } from "@/shared/utils/formatters"
import { useForm } from "react-hook-form"
import { zodResolver } from "@hookform/resolvers/zod"
import { DEPARTMENT_ROUTES, TAX_ROUTES } from "@garage/api"
import { useJobCard } from "./job-card-context"

// ── Schema ──

const relationFieldSchema = z.object({ value: z.string(), label: z.string() }).nullable()

const requiredRelationFieldSchema = relationFieldSchema.superRefine((value, ctx) => {
    if (!value?.value) {
        ctx.addIssue({
            code: z.ZodIssueCode.custom,
            message: "This field is required",
        })
    }
})

const jobCardExpenseItemFormSchema = z.object({
    expense_item: relationFieldSchema,
    department: requiredRelationFieldSchema,
    tax: relationFieldSchema.optional(),
    quantity: z.coerce.number().min(1, "Quantity is required"),
    rate: z.coerce.number().min(0, "Rate is required"),
    discount_amount: z.coerce.number().min(0).optional(),
    chart_of_account: z.string().optional(),
    description: z.string().optional(),
})

type JobCardExpenseItemFormValues = z.infer<typeof jobCardExpenseItemFormSchema>

// ── Props ──

export type JobCardExpenseItemFormProps = {
    jobCardId: string
    jobCardExpenseItemId?: number | null
    initialData?: unknown
    onSuccess?: () => void
    onCancel?: () => void
}

const DEFAULT_VALUES: JobCardExpenseItemFormValues = {
    expense_item: null,
    department: null,
    tax: null,
    quantity: 1,
    rate: 0,
    discount_amount: undefined,
    chart_of_account: "",
    description: "",
}

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

function mapDepartmentOption(item: any) {
    const id = item?.id ?? item?.department_id
    return {
        value: String(id),
        label: item?.name ?? item?.title ?? item?.department_name ?? String(id),
    }
}

function mapToFormValues(data: unknown): JobCardExpenseItemFormValues {
    const d = (data as any) ?? {}
    return {
        expense_item: d.expense_item
            ? { value: String(d.expense_item.id), label: d.expense_item.item_name ?? String(d.expense_item.id) }
            : null,
        department: (d.department || d.department_id != null)
            ? mapDepartmentOption(d.department ?? { id: d.department_id, name: d.department_name ?? d.department_title })
            : null,
        tax: d.tax_id != null
            ? { value: String(d.tax_id), label: formatTaxLabel(d.tax, String(d.tax_id)) }
            : null,
        quantity: d.quantity ?? 1,
        rate: d.rate != null ? Number(d.rate) : 0,
        discount_amount: d.discount_amount != null ? Number(d.discount_amount) : undefined,
        chart_of_account: d.chart_of_account ?? "",
        description: d.description ?? "",
    }
}

function mapJobCardDepartmentToRelation(jobCard: unknown) {
    const d = (jobCard as any) ?? {}
    const departmentId = d.department_id ?? d.department?.id
    if (departmentId == null) {
        return null
    }
    return {
        value: String(departmentId),
        label: d.department?.name ?? d.department_name ?? d.department_title ?? String(departmentId),
    }
}

// ── Component ──

export function JobCardExpenseItemForm({
    jobCardId,
    jobCardExpenseItemId,
    initialData,
    onSuccess,
    onCancel,
}: JobCardExpenseItemFormProps) {
    const api = useAuthApi()
    const jobCard = useJobCard()
    const isEditing = !!jobCardExpenseItemId
    const isLineItemDiscount = (jobCard as any)?.discount_type === "line_item_level"

    const form = useForm<JobCardExpenseItemFormValues>({
        resolver: zodResolver(jobCardExpenseItemFormSchema) as any,
        defaultValues: initialData
            ? mapToFormValues(initialData)
            : {
                ...DEFAULT_VALUES,
                department: mapJobCardDepartmentToRelation(jobCard),
            },
    })

    const [error, setError] = React.useState<string | null>(null)
    const [isPending, setIsPending] = React.useState(false)

    async function handleSubmit(values: JobCardExpenseItemFormValues) {
        setError(null)
        setIsPending(true)
        try {
            if (isEditing && jobCardExpenseItemId) {
                await toast.promise(
                    api.jobCards.updateExpenseItem(jobCardId, {
                        job_card_expense_item_id: jobCardExpenseItemId,
                        quantity: values.quantity,
                        rate: values.rate,
                        discount_amount: isLineItemDiscount ? (values.discount_amount ?? 0) : undefined,
                        description: values.description || undefined,
                    }),
                    {
                        loading: "Updating expense item...",
                        success: "Expense item updated successfully",
                        error: "Failed to update expense item",
                    }
                )
            } else {
                if (!values.department?.value) {
                    setError("Department is required")
                    return
                }

                await toast.promise(
                    api.jobCards.addExpenseItem(jobCardId, {
                        expense_item_id: values.expense_item ? Number(values.expense_item.value) : undefined,
                        department_id: Number(values.department.value),
                        tax_id: values.tax ? Number(values.tax.value) : undefined,
                        quantity: values.quantity,
                        rate: values.rate,
                        discount_amount: isLineItemDiscount ? (values.discount_amount ?? 0) : undefined,
                        chart_of_account: values.chart_of_account || undefined,
                        description: values.description || undefined,
                    }),
                    {
                        loading: "Adding expense item...",
                        success: "Expense item added successfully",
                        error: "Failed to add expense item",
                    }
                )
            }
            form.reset()
            onSuccess?.()
        } catch (err: any) {
            setError(err?.message ?? "An unexpected error occurred")
        } finally {
            setIsPending(false)
        }
    }

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

            <FieldGroup>
                {!isEditing && (
                    <RhfAsyncSelectField
                        name="expense_item"
                        label="Expense Item"
                        placeholder="Select expense item"
                        required
                        queryKey={["expense-items"]}
                        listFn={() => api.expenses.listItems()}
                        mapOption={(item: any) => ({
                            value: String(item.id),
                            label: item.item_name ?? item.title ?? String(item.id),
                        })}
                        {...STORE_OBJECT}
                    />
                )}

                <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
                    <RhfTextField
                        name="quantity"
                        label="Quantity"
                        type="number"
                        placeholder="1"
                        required
                    />
                    <RhfTextField
                        name="rate"
                        label="Rate"
                        type="number"
                        placeholder="0.00"
                        required
                    />
                </div>

                {isLineItemDiscount && (
                    <RhfTextField
                        name="discount_amount"
                        label="Discount Amount"
                        type="number"
                        placeholder="0.00"
                    />
                )}

                {!isEditing && (
                    <>
                        <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
                            <RhfAsyncSelectField
                                name="department"
                                label="Department"
                                placeholder="Select department"
                                required
                                queryKey={[DEPARTMENT_ROUTES.INDEX]}
                                listFn={() => api.departments.list()}
                                mapOption={mapDepartmentOption}
                                createForm={(props) => <DepartmentInlineForm {...props} />}
                                createLabel="Department"
                                {...STORE_OBJECT}
                            />
                            <RhfAsyncSelectField
                                name="tax"
                                label="Tax"
                                placeholder="Select tax rate"
                                queryKey={[TAX_ROUTES.INDEX]}
                                listFn={() => api.taxes.list()}
                                mapOption={(item: any) => ({
                                    value: String(item.id),
                                    label: item.title ? `${item.title} (${item.rate}%)` : `#${item.id}`,
                                })}
                                {...STORE_OBJECT}
                            />
                        </div>

                        <RhfTextField
                            name="chart_of_account"
                            label="Chart of Account"
                            placeholder="e.g. COA-400"
                        />
                    </>
                )}

                <RhfTextareaField
                    name="description"
                    label="Description"
                    placeholder="Optional notes"
                />
            </FieldGroup>

            <div className="flex justify-end gap-2 pt-2">
                {onCancel && (
                    <Button type="button" variant="outline" onClick={onCancel}>
                        Cancel
                    </Button>
                )}
                <Button type="submit" disabled={isPending}>
                    {isPending ? (
                        isEditing ? "Saving..." : "Adding..."
                    ) : isEditing ? (
                        <>
                            <Save className="me-2 h-4 w-4" />
                            Save Changes
                        </>
                    ) : (
                        <>
                            <Plus className="me-2 h-4 w-4" />
                            Add Expense Item
                        </>
                    )}
                </Button>
            </div>
        </Rhform>
    )
}
