"use client"

import type { ReactNode } from "react"
import { Label } from "@/components/ui/label"
import { Switch } from "@/components/ui/switch"
import { Checkbox } from "@/components/ui/checkbox"
import { cn } from "@/lib/utils"

/**
 * Settings UI kit — composants unifiés pour les interfaces de réglages
 * (/admin/* et /mail/settings). Centralise cards, champs, lignes à bascule,
 * grilles et hints afin d'homogénéiser typographies, paddings et alignements.
 */

/** Surface card commune (réglages admin + mail) — alignée sur la card mail. */
export const SETTINGS_CARD_SURFACE_CLASS = cn(
  "rounded-xl border border-mail-border bg-mail-surface shadow-sm",
  "dark:bg-mail-surface-elevated dark:shadow-[0_1px_4px_rgba(0,0,0,0.35)]",
)

export const SETTINGS_CARD_TITLE_CLASS = "text-sm font-semibold text-foreground"
export const SETTINGS_CARD_DESCRIPTION_CLASS =
  "text-[13px] leading-relaxed text-muted-foreground"
export const SETTINGS_FIELD_LABEL_CLASS = "text-xs font-medium text-muted-foreground"

/** Carte de réglages : en-tête (titre + description + action) puis corps. */
export function SettingsCard({
  title,
  description,
  hint,
  action,
  badges,
  footer,
  children,
  className,
  bodyClassName,
  contentClassName,
  divider = true,
}: {
  title?: ReactNode
  description?: ReactNode
  /** Élément aligné à droite de l'en-tête (Switch, bouton, badge…). */
  action?: ReactNode
  /** Ligne d'indications/badges sous la description. */
  badges?: ReactNode
  hint?: ReactNode
  footer?: ReactNode
  children?: ReactNode
  className?: string
  /** Classe sur le wrapper interne (padding). */
  bodyClassName?: string
  /** Classe sur le conteneur du corps (children). */
  contentClassName?: string
  /** Séparateur entre en-tête et corps. */
  divider?: boolean
}) {
  const hasHeader = Boolean(title || description || action || badges || hint)

  return (
    <section className={cn(SETTINGS_CARD_SURFACE_CLASS, className)}>
      <div className={cn("p-5", bodyClassName)}>
        {hasHeader ? (
          <div className="flex items-start gap-4">
            <div className="min-w-0 flex-1">
              {title ? <p className={SETTINGS_CARD_TITLE_CLASS}>{title}</p> : null}
              {description ? (
                <p className={cn(title && "mt-1", SETTINGS_CARD_DESCRIPTION_CLASS)}>
                  {description}
                </p>
              ) : null}
              {badges ? <div className="mt-2 flex flex-wrap gap-2">{badges}</div> : null}
              {hint ? <div className="mt-2">{hint}</div> : null}
            </div>
            {action ? <div className="shrink-0">{action}</div> : null}
          </div>
        ) : null}

        {children ? (
          <div
            className={cn(
              hasHeader && "mt-4 pt-4",
              hasHeader && divider && "border-t border-mail-border",
              "space-y-4",
              contentClassName,
            )}
          >
            {children}
          </div>
        ) : null}

        {footer ? <div className="mt-4">{footer}</div> : null}
      </div>
    </section>
  )
}

/** Champ de formulaire : label + contrôle + hint/erreur. */
export function SettingsField({
  label,
  htmlFor,
  hint,
  error,
  required,
  children,
  className,
  labelClassName,
  labelAction,
}: {
  label?: ReactNode
  htmlFor?: string
  hint?: ReactNode
  error?: ReactNode
  required?: boolean
  children: ReactNode
  className?: string
  labelClassName?: string
  /** Élément aligné à droite du label (lien, bouton…). */
  labelAction?: ReactNode
}) {
  return (
    <div className={cn("space-y-1.5", className)}>
      {label ? (
        <div className="flex items-center justify-between gap-2">
          <Label htmlFor={htmlFor} className={cn(SETTINGS_FIELD_LABEL_CLASS, labelClassName)}>
            {label}
            {required ? <span className="ml-0.5 text-destructive">*</span> : null}
          </Label>
          {labelAction}
        </div>
      ) : null}
      {children}
      {hint ? (
        <div className="text-xs leading-relaxed text-muted-foreground">{hint}</div>
      ) : null}
      {error ? (
        <div className="text-xs leading-relaxed text-destructive">{error}</div>
      ) : null}
    </div>
  )
}

/** Ligne à bascule : titre + description + Switch. */
export function SettingsToggleRow({
  title,
  description,
  checked,
  onCheckedChange,
  disabled,
  hint,
  variant = "bordered",
  className,
}: {
  title: ReactNode
  description?: ReactNode
  checked: boolean
  onCheckedChange: (checked: boolean) => void
  disabled?: boolean
  /** Indication sous la ligne (ex. verrou déploiement). */
  hint?: ReactNode
  variant?: "bordered" | "plain"
  className?: string
}) {
  const row = (
    <label
      className={cn(
        "flex items-center justify-between gap-4",
        variant === "bordered" &&
          "rounded-lg border border-mail-border bg-mail-surface-muted/40 px-3.5 py-3",
        disabled && "opacity-70",
        className,
      )}
    >
      <span className="min-w-0">
        <span className="block text-sm font-medium text-foreground">{title}</span>
        {description ? (
          <span className="mt-0.5 block text-xs leading-relaxed text-muted-foreground">
            {description}
          </span>
        ) : null}
      </span>
      <Switch checked={checked} disabled={disabled} onCheckedChange={onCheckedChange} />
    </label>
  )

  if (!hint) return row
  return (
    <div className="space-y-1.5">
      {row}
      {hint}
    </div>
  )
}

/** Ligne à cocher : titre + description + Checkbox. */
export function SettingsCheckboxRow({
  title,
  description,
  checked,
  onCheckedChange,
  disabled,
  variant = "plain",
  className,
}: {
  title: ReactNode
  description?: ReactNode
  checked: boolean
  onCheckedChange: (checked: boolean) => void
  disabled?: boolean
  variant?: "bordered" | "plain"
  className?: string
}) {
  return (
    <label
      className={cn(
        "flex items-start gap-2.5",
        variant === "bordered" &&
          "rounded-lg border border-mail-border bg-mail-surface-muted/40 px-3.5 py-3",
        disabled && "opacity-70",
        className,
      )}
    >
      <Checkbox
        checked={checked}
        disabled={disabled}
        onCheckedChange={(v) => onCheckedChange(v === true)}
        className="mt-0.5"
      />
      <span className="min-w-0">
        <span className="block text-sm text-foreground">{title}</span>
        {description ? (
          <span className="mt-0.5 block text-xs leading-relaxed text-muted-foreground">
            {description}
          </span>
        ) : null}
      </span>
    </label>
  )
}

/** Grille de champs responsive (1 ou 2 colonnes). */
export function SettingsGrid({
  columns = 2,
  children,
  className,
}: {
  columns?: 1 | 2
  children: ReactNode
  className?: string
}) {
  return (
    <div
      className={cn(
        "grid min-w-0 gap-4",
        columns === 2 && "sm:grid-cols-2",
        className,
      )}
    >
      {children}
    </div>
  )
}

/** Indication brève (texte muted) sous un champ ou une carte. */
export function SettingsHint({
  children,
  tone = "muted",
  className,
}: {
  children: ReactNode
  tone?: "muted" | "warning" | "danger"
  className?: string
}) {
  return (
    <p
      className={cn(
        "text-xs leading-relaxed",
        tone === "muted" && "text-muted-foreground",
        tone === "warning" && "text-amber-600 dark:text-amber-500",
        tone === "danger" && "text-destructive",
        className,
      )}
    >
      {children}
    </p>
  )
}