"use client"

import { useEffect, useMemo, useState } from "react"
import { Trash2 } from "lucide-react"
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 {
  Collapsible,
  CollapsibleContent,
  CollapsibleTrigger,
} from "@/components/ui/collapsible"
import { NavColorPickerTrigger } from "@/components/gmail/nav/nav-color-picker-trigger"
import {
  NavMessageVisibilityFields,
  NavSidebarVisibilityFields,
} from "@/components/gmail/nav/nav-visibility-fields"
import { useSidebarNav, folderMoveParentOptions } from "@/lib/sidebar-nav-context"
import { normalizeNavColorClass } from "@/lib/nav-color"
import { cn } from "@/lib/utils"

export function NavLabelSettingsCard({
  id,
  name,
  color,
  depth = 0,
}: {
  id: string
  name: string
  color: string
  depth?: number
}) {
  const nav = useSidebarNav()
  const prefs = nav.getNavItemPrefs(id)
  const colorClass = normalizeNavColorClass(color)

  const [renameDraft, setRenameDraft] = useState(name)
  const [sublabelName, setSublabelName] = useState("")

  useEffect(() => {
    setRenameDraft(name)
  }, [name])

  return (
    <NavItemSettingsShell
      title={name}
      color={colorClass}
      depth={depth}
      onColorChange={(sw) => nav.updateFolderOrLabelColor(id, sw)}
      onDelete={() => nav.removeFolderOrLabelRow(id)}
      deleteLabel="Supprimer le libellé"
    >
      <div className="space-y-4">
        <div className="grid gap-4 sm:grid-cols-2">
          <NavSidebarVisibilityFields
            listKind="labels"
            value={prefs.sidebar}
            onChange={(v) => nav.setNavItemSidebarVisibility(id, v)}
          />
          <NavMessageVisibilityFields
            value={prefs.messages}
            onChange={(v) => nav.setNavItemMessageVisibility(id, v)}
          />
        </div>

        <div className="space-y-2">
          <Label className="text-xs" htmlFor={`rename-label-${id}`}>
            Renommer
          </Label>
          <div className="flex flex-wrap gap-2">
            <Input
              id={`rename-label-${id}`}
              value={renameDraft}
              onChange={(e) => setRenameDraft(e.target.value)}
              className="min-w-[160px] flex-1"
            />
            <Button
              type="button"
              variant="secondary"
              disabled={!renameDraft.trim() || renameDraft.trim() === name}
              onClick={() => nav.renameFolderOrLabel(id, renameDraft.trim())}
            >
              Enregistrer
            </Button>
          </div>
        </div>

        <div className="space-y-2">
          <Label className="text-xs" htmlFor={`sublabel-${id}`}>
            Ajouter un sous-libellé
          </Label>
          <div className="flex flex-wrap gap-2">
            <Input
              id={`sublabel-${id}`}
              value={sublabelName}
              onChange={(e) => setSublabelName(e.target.value)}
              placeholder="Nom du sous-libellé"
              className="min-w-[160px] flex-1"
            />
            <Button
              type="button"
              variant="secondary"
              disabled={!sublabelName.trim()}
              onClick={() => {
                nav.addChildLabelRow(id, sublabelName.trim())
                setSublabelName("")
              }}
            >
              Ajouter
            </Button>
          </div>
        </div>
      </div>
    </NavItemSettingsShell>
  )
}

export function NavImapFolderSettingsCard({
  id,
  name,
  remoteName,
  depth = 0,
}: {
  id: string
  name: string
  remoteName?: string
  depth?: number
}) {
  const nav = useSidebarNav()
  const prefs = nav.getNavItemPrefs(id)
  const subtitle =
    remoteName && remoteName !== name ? remoteName : undefined

  return (
    <NavItemSettingsShell
      title={name}
      subtitle={subtitle}
      depth={depth}
      hideDelete
      hideColor
    >
      <div className="space-y-4">
        <div className="grid gap-4 sm:grid-cols-2">
          <NavSidebarVisibilityFields
            listKind="folders"
            value={prefs.sidebar}
            onChange={(v) => nav.setNavItemSidebarVisibility(id, v)}
          />
          <NavMessageVisibilityFields
            value={prefs.messages}
            onChange={(v) => nav.setNavItemMessageVisibility(id, v)}
          />
        </div>
        <p className="text-xs text-muted-foreground">
          Dossier synchronisé depuis le serveur mail — structure non modifiable ici.
        </p>
      </div>
    </NavItemSettingsShell>
  )
}

export function NavFolderSettingsCard({
  id,
  name,
  color,
  depth = 0,
}: {
  id: string
  name: string
  color?: string
  depth?: number
}) {
  const nav = useSidebarNav()
  const prefs = nav.getNavItemPrefs(id)
  const colorClass = normalizeNavColorClass(color)

  const [renameDraft, setRenameDraft] = useState(name)
  const [moveParent, setMoveParent] = useState("__root__")
  const [subfolderName, setSubfolderName] = useState("")

  const moveTargets = useMemo(
    () => folderMoveParentOptions(nav.folderTree, id),
    [nav.folderTree, id]
  )

  useEffect(() => {
    setRenameDraft(name)
  }, [name])

  return (
    <NavItemSettingsShell
      title={name}
      color={colorClass}
      depth={depth}
      onColorChange={(sw) => nav.updateFolderOrLabelColor(id, sw)}
      onDelete={() => nav.removeFolderOrLabelRow(id)}
      deleteLabel="Supprimer le dossier"
    >
      <div className="space-y-4">
        <div className="grid gap-4 sm:grid-cols-2">
          <NavSidebarVisibilityFields
            listKind="folders"
            value={prefs.sidebar}
            onChange={(v) => nav.setNavItemSidebarVisibility(id, v)}
          />
          <NavMessageVisibilityFields
            value={prefs.messages}
            onChange={(v) => nav.setNavItemMessageVisibility(id, v)}
          />
        </div>

        <div className="space-y-2">
          <Label className="text-xs" htmlFor={`rename-folder-${id}`}>
            Renommer
          </Label>
          <div className="flex flex-wrap gap-2">
            <Input
              id={`rename-folder-${id}`}
              value={renameDraft}
              onChange={(e) => setRenameDraft(e.target.value)}
              className="min-w-[160px] flex-1"
            />
            <Button
              type="button"
              variant="secondary"
              disabled={!renameDraft.trim() || renameDraft.trim() === name}
              onClick={() => nav.renameFolderOrLabel(id, renameDraft.trim())}
            >
              Enregistrer
            </Button>
          </div>
        </div>

        <div className="space-y-2">
          <Label className="text-xs">Déplacer vers</Label>
          <div className="flex flex-wrap gap-2">
            <Select value={moveParent} onValueChange={setMoveParent}>
              <SelectTrigger className="min-w-[200px] flex-1">
                <SelectValue placeholder="Emplacement" />
              </SelectTrigger>
              <SelectContent>
                {moveTargets.map((opt) => (
                  <SelectItem key={opt.value} value={opt.value}>
                    {opt.label}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
            <Button
              type="button"
              variant="secondary"
              onClick={() =>
                nav.moveFolder(id, moveParent === "__root__" ? null : moveParent)
              }
            >
              Déplacer
            </Button>
          </div>
        </div>

        <div className="space-y-2">
          <Label className="text-xs" htmlFor={`subfolder-${id}`}>
            Nouveau sous-dossier
          </Label>
          <div className="flex flex-wrap gap-2">
            <Input
              id={`subfolder-${id}`}
              value={subfolderName}
              onChange={(e) => setSubfolderName(e.target.value)}
              placeholder="Nom du sous-dossier"
              className="min-w-[160px] flex-1"
            />
            <Button
              type="button"
              variant="secondary"
              disabled={!subfolderName.trim()}
              onClick={() => {
                nav.addSubfolder(id, subfolderName.trim())
                setSubfolderName("")
              }}
            >
              Créer
            </Button>
          </div>
        </div>
      </div>
    </NavItemSettingsShell>
  )
}

function NavItemSettingsShell({
  title,
  subtitle,
  color,
  depth,
  onColorChange,
  onDelete,
  deleteLabel,
  hideDelete = false,
  hideColor = false,
  children,
}: {
  title: string
  subtitle?: string
  color?: string
  depth: number
  onColorChange?: (swatch: string) => void
  onDelete?: () => void
  deleteLabel?: string
  hideDelete?: boolean
  hideColor?: boolean
  children: import("react").ReactNode
}) {
  const [open, setOpen] = useState(false)

  return (
    <Collapsible
      open={open}
      onOpenChange={setOpen}
      className="mail-settings-card rounded-lg 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)]"
    >
      <div
        className="flex items-center gap-1 px-3 py-2"
        style={{ paddingLeft: `${depth * 12 + 12}px` }}
      >
        {!hideColor && color && onColorChange ? (
          <NavColorPickerTrigger
            value={color}
            onChange={onColorChange}
            aria-label="Couleur"
          />
        ) : null}
        <CollapsibleTrigger className="flex min-w-0 flex-1 flex-col items-start text-left">
          <span className="truncate text-sm font-medium">{title}</span>
          {subtitle ? (
            <span className="truncate text-xs text-muted-foreground">{subtitle}</span>
          ) : null}
        </CollapsibleTrigger>
        {!hideDelete && onDelete ? (
          <Button
            type="button"
            variant="ghost"
            size="icon"
            className="shrink-0 text-muted-foreground hover:text-destructive"
            aria-label={deleteLabel ?? "Supprimer"}
            onClick={(e) => {
              e.stopPropagation()
              onDelete()
            }}
          >
            <Trash2 className="size-4" />
          </Button>
        ) : null}
      </div>
      <CollapsibleContent className="border-t border-border px-3 py-4">
        {children}
      </CollapsibleContent>
    </Collapsible>
  )
}

/** Flatten label rows for settings (parent/child via `/` in name). */
export function flattenLabelRowsForSettings(
  rows: { id: string; label: string; color: string }[]
) {
  return rows.map((row) => ({
    ...row,
    depth: Math.max(0, row.label.split("/").length - 1),
  }))
}

type FolderSettingsNode = {
  id: string
  label: string
  color?: string
  children?: FolderSettingsNode[]
}

export function FolderSettingsTree({
  nodes,
  depth = 0,
}: {
  nodes: FolderSettingsNode[]
  depth?: number
}) {
  return (
    <ul className={cn("space-y-2", depth > 0 && "mt-2")}>
      {nodes.map((node) => (
        <li key={node.id}>
          <NavFolderSettingsCard
            id={node.id}
            name={node.label}
            color={node.color}
            depth={depth}
          />
          {node.children?.length ? (
            <FolderSettingsTree nodes={node.children} depth={depth + 1} />
          ) : null}
        </li>
      ))}
    </ul>
  )
}

type ImapFolderSettingsNode = {
  id: string
  label: string
  remoteName?: string
  children?: ImapFolderSettingsNode[]
}

export function ImapFolderSettingsTree({
  nodes,
  depth = 0,
}: {
  nodes: ImapFolderSettingsNode[]
  depth?: number
}) {
  return (
    <ul className={cn("space-y-2", depth > 0 && "mt-2")}>
      {nodes.map((node) => (
        <li key={node.id}>
          <NavImapFolderSettingsCard
            id={node.id}
            name={node.label}
            remoteName={node.remoteName}
            depth={depth}
          />
          {node.children?.length ? (
            <ImapFolderSettingsTree nodes={node.children} depth={depth + 1} />
          ) : null}
        </li>
      ))}
    </ul>
  )
}