'use client'

import { useState, useEffect } from 'react'
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog'
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
import { Save } from 'lucide-react'
import { useToast } from '@/components/ui/use-toast'
import { getErrorMessage } from '@/lib/errors/get-error-message'
import EmployeeTaxCard, { type EmployeeTaxValue } from '@/components/salary/EmployeeTaxCard'
import LineDimensionFields from '@/components/dimensions/LineDimensionFields'

function RequiredMark() {
  return <span className="text-destructive ml-0.5">*</span>
}

interface Props {
  open: boolean
  onOpenChange: (open: boolean) => void
  /** Fired after a successful create. Hosts close the dialog and refresh their list. */
  onCreated: () => void
}

/**
 * "Ny anställd" as a modal: mirrors NewSupplierInvoiceDialog. The last
 * register entity (after customers/suppliers/articles) to move off a full
 * page. Card sections carry over from the old /salary/employees/new page.
 */
export default function NewEmployeeDialog({ open, onOpenChange, onCreated }: Props) {
  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent
        className="sm:max-w-3xl max-h-[95dvh] sm:max-h-[90vh] overflow-y-auto"
        // A half-typed employee must survive an accidental backdrop click or
        // a stray Escape (the municipality combobox and dimension pickers
        // portal outside the dialog). Closing is explicit: the header X or
        // Avbryt. Same convention as NewJournalEntryDialog.
        onEscapeKeyDown={(e) => e.preventDefault()}
        onPointerDownOutside={(e) => e.preventDefault()}
        onInteractOutside={(e) => e.preventDefault()}
      >
        <DialogHeader>
          <DialogTitle>Ny anställd</DialogTitle>
        </DialogHeader>
        <NewEmployeeForm onCreated={onCreated} onCancel={() => onOpenChange(false)} />
      </DialogContent>
    </Dialog>
  )
}

// Inner component so form state resets whenever the dialog reopens (Radix
// unmounts DialogContent children on close).
function NewEmployeeForm({ onCreated, onCancel }: { onCreated: () => void; onCancel: () => void }) {
  const { toast } = useToast()
  const [saving, setSaving] = useState(false)
  const [employmentType, setEmploymentType] = useState('employee')
  const [salaryType, setSalaryType] = useState('monthly')
  const [personnummer, setPersonnummer] = useState('')
  const [vacationRule, setVacationRule] = useState('procentregeln')
  // Default dimensions bag ({sie_dim_no: object_code}) proposed on the
  // employee's salary-cost lines at booking. The fields render only when
  // company_settings.dimensions_enabled: same UI gate as the voucher form.
  const [dimensionsEnabled, setDimensionsEnabled] = useState(false)
  const [dimensions, setDimensions] = useState<Record<string, string>>({})
  const [tax, setTax] = useState<EmployeeTaxValue>({
    f_skatt_status: 'a_skatt',
    is_sidoinkomst: false,
    tax_table_number: null,
    tax_column: 1,
    tax_municipality: '',
  })

  useEffect(() => {
    fetch('/api/settings')
      .then((r) => r.json())
      .then(({ data }) => setDimensionsEnabled(data?.dimensions_enabled === true))
      .catch(() => {/* keep the dimension fields hidden */})
  }, [])

  function setDimension(dimNo: string, code: string | null) {
    setDimensions((prev) => {
      const next = { ...prev }
      const value = code?.trim()
      if (value) next[dimNo] = value
      else delete next[dimNo]
      return next
    })
  }

  async function handleSubmit(e: React.FormEvent<HTMLFormElement>) {
    e.preventDefault()
    setSaving(true)

    const form = new FormData(e.currentTarget)
    const body = {
      first_name: form.get('first_name') as string,
      last_name: form.get('last_name') as string,
      personnummer: personnummer.replace(/\D/g, ''),
      employment_type: employmentType,
      employment_start: form.get('employment_start') as string,
      employment_end: form.get('employment_end') as string || undefined,
      employment_degree: parseFloat(form.get('employment_degree') as string) || 100,
      salary_type: salaryType,
      monthly_salary: salaryType === 'monthly' ? (parseFloat(form.get('monthly_salary') as string) || undefined) : undefined,
      hourly_rate: salaryType === 'hourly' ? (parseFloat(form.get('hourly_rate') as string) || undefined) : undefined,
      f_skatt_status: tax.f_skatt_status,
      is_sidoinkomst: tax.is_sidoinkomst,
      tax_table_number: tax.tax_table_number ?? undefined,
      tax_column: tax.tax_column,
      tax_municipality: tax.tax_municipality || undefined,
      email: form.get('email') as string || undefined,
      phone: form.get('phone') as string || undefined,
      address_line1: form.get('address_line1') as string || undefined,
      postal_code: form.get('postal_code') as string || undefined,
      city: form.get('city') as string || undefined,
      clearing_number: form.get('clearing_number') as string || undefined,
      bank_account_number: form.get('bank_account_number') as string || undefined,
      vacation_rule: vacationRule,
      vacation_days_per_year: parseInt(form.get('vacation_days_per_year') as string) || 25,
      // Always sent: {} means no default dimensions.
      default_dimensions: dimensions,
    }

    const res = await fetch('/api/salary/employees', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(body),
    })

    if (res.ok) {
      toast({ title: 'Anställd skapad' })
      onCreated()
    } else {
      const result = await res.json()
      toast({
        title: 'Kunde inte skapa anställd',
        description: getErrorMessage(result, { context: 'salary', statusCode: res.status }),
        variant: 'destructive',
      })
    }

    setSaving(false)
  }

  return (
    <form onSubmit={handleSubmit} className="space-y-6">
      {/* Personal info */}
      <Card>
        <CardHeader>
          <CardTitle className="text-base">Personuppgifter</CardTitle>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label htmlFor="first_name">Förnamn<RequiredMark /></Label>
              <Input id="first_name" name="first_name" required />
            </div>
            <div className="space-y-2">
              <Label htmlFor="last_name">Efternamn<RequiredMark /></Label>
              <Input id="last_name" name="last_name" required />
            </div>
          </div>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label htmlFor="personnummer">Personnummer (12 siffror)<RequiredMark /></Label>
              <Input
                id="personnummer"
                name="personnummer"
                placeholder="ÅÅÅÅMMDDNNNN"
                required
                maxLength={13}
                value={personnummer}
                onChange={(e) => setPersonnummer(e.target.value)}
              />
              <p className="text-xs text-muted-foreground">Krypteras vid lagring</p>
            </div>
            <div className="space-y-2">
              <Label htmlFor="email">E-post</Label>
              <Input id="email" name="email" type="email" />
              <p className="text-xs text-muted-foreground">Krävs för att skicka lönebesked</p>
            </div>
          </div>
          <div className="space-y-2">
            <Label htmlFor="phone">Telefon</Label>
            <Input id="phone" name="phone" className="max-w-xs" />
          </div>
        </CardContent>
      </Card>

      {/* Address */}
      <Card>
        <CardHeader>
          <CardTitle className="text-base">Adress</CardTitle>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="space-y-2">
            <Label htmlFor="address_line1">Gatuadress</Label>
            <Input id="address_line1" name="address_line1" />
          </div>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label htmlFor="postal_code">Postnummer</Label>
              <Input id="postal_code" name="postal_code" className="max-w-[160px]" />
            </div>
            <div className="space-y-2">
              <Label htmlFor="city">Ort</Label>
              <Input id="city" name="city" />
            </div>
          </div>
        </CardContent>
      </Card>

      {/* Employment */}
      <Card>
        <CardHeader>
          <CardTitle className="text-base">Anställning</CardTitle>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
            <div className="space-y-2">
              <Label htmlFor="employment_type">Typ</Label>
              <Select value={employmentType} onValueChange={setEmploymentType}>
                <SelectTrigger id="employment_type">
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="employee">Anställd</SelectItem>
                  <SelectItem value="company_owner">Företagsledare</SelectItem>
                  <SelectItem value="board_member">Styrelseledamot</SelectItem>
                </SelectContent>
              </Select>
            </div>
            <div className="space-y-2">
              <Label htmlFor="employment_start">Anställningsdatum<RequiredMark /></Label>
              <Input id="employment_start" name="employment_start" type="date" required />
            </div>
            <div className="space-y-2">
              <Label htmlFor="employment_end">Slutdatum</Label>
              <Input id="employment_end" name="employment_end" type="date" />
            </div>
            <div className="space-y-2">
              <Label htmlFor="employment_degree">Sysselsättningsgrad (%)</Label>
              <Input id="employment_degree" name="employment_degree" type="number" defaultValue="100" min="1" max="100" />
            </div>
          </div>
        </CardContent>
      </Card>

      {/* Salary */}
      <Card>
        <CardHeader>
          <CardTitle className="text-base">Lön</CardTitle>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label htmlFor="salary_type">Löneform<RequiredMark /></Label>
              <Select value={salaryType} onValueChange={setSalaryType}>
                <SelectTrigger id="salary_type">
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="monthly">Månadslön</SelectItem>
                  <SelectItem value="hourly">Timlön</SelectItem>
                </SelectContent>
              </Select>
            </div>
            {salaryType === 'monthly' ? (
              <div className="space-y-2">
                <Label htmlFor="monthly_salary">Månadslön (brutto, SEK)<RequiredMark /></Label>
                <Input id="monthly_salary" name="monthly_salary" type="number" step="1" min="1" required />
              </div>
            ) : (
              <div className="space-y-2">
                <Label htmlFor="hourly_rate">Timlön (SEK)<RequiredMark /></Label>
                <Input id="hourly_rate" name="hourly_rate" type="number" step="0.01" min="0.01" required />
              </div>
            )}
          </div>
        </CardContent>
      </Card>

      {/* Default dimensions (kostnadsställe/projekt) */}
      {dimensionsEnabled && (
        <Card>
          <CardHeader>
            <CardTitle className="text-base">Kostnadsställe / Projekt (standard)</CardTitle>
          </CardHeader>
          <CardContent className="space-y-2">
            <LineDimensionFields dimensions={dimensions} onChange={setDimension} />
            <p className="text-xs text-muted-foreground">
              Föreslås på lönekostnadsrader vid bokföring av lönekörningar.
            </p>
          </CardContent>
        </Card>
      )}

      {/* Tax */}
      <EmployeeTaxCard personnummer={personnummer} onChange={setTax} />

      {/* Vacation */}
      <Card>
        <CardHeader>
          <CardTitle className="text-base">Semester</CardTitle>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label htmlFor="vacation_rule">Semesterregel</Label>
              <Select value={vacationRule} onValueChange={setVacationRule}>
                <SelectTrigger id="vacation_rule">
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="procentregeln">Procentregeln (12 %)</SelectItem>
                  <SelectItem value="sammaloneregeln">Sammalöneregeln</SelectItem>
                  <SelectItem value="semesterersattning">Semesterersättning (betalas ut direkt)</SelectItem>
                  <SelectItem value="none">Ingen semesteravsättning</SelectItem>
                </SelectContent>
              </Select>
              {vacationRule === 'none' && (
                <p className="text-xs text-muted-foreground">
                  Ingen avsättning till 2920 bokas. Vanligt för ägare som är enda anställd.
                </p>
              )}
              {vacationRule === 'semesterersattning' && (
                <p className="text-xs text-muted-foreground">
                  12 % läggs på varje lönekörning och bokas mot 7285. Ingen semesterlöneskuld byggs upp. Vanligt för tim- och visstidsanställda.
                </p>
              )}
            </div>
            <div className="space-y-2">
              <Label htmlFor="vacation_days_per_year">Semesterdagar per år</Label>
              <Input id="vacation_days_per_year" name="vacation_days_per_year" type="number" min="25" max="40" defaultValue="25" />
              <p className="text-xs text-muted-foreground">Lagstadgat minimum: 25 dagar</p>
            </div>
          </div>
        </CardContent>
      </Card>

      {/* Bank */}
      <Card>
        <CardHeader>
          <CardTitle className="text-base">Bankkonto</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <div className="space-y-2">
              <Label htmlFor="clearing_number">Clearingnummer</Label>
              <Input id="clearing_number" name="clearing_number" />
            </div>
            <div className="space-y-2">
              <Label htmlFor="bank_account_number">Kontonummer</Label>
              <Input id="bank_account_number" name="bank_account_number" />
            </div>
          </div>
          <p className="text-xs text-muted-foreground mt-2">Krävs innan lönekörning kan godkännas</p>
        </CardContent>
      </Card>

      {/* Actions */}
      <div className="flex justify-end gap-3">
        <Button type="button" variant="outline" onClick={onCancel}>
          Avbryt
        </Button>
        <Button type="submit" disabled={saving}>
          <Save className="mr-2 h-4 w-4" />
          {saving ? 'Sparar...' : 'Spara'}
        </Button>
      </div>
    </form>
  )
}