"use client"

import { useState } from "react"
import { Sidebar } from "@/components/dashboard/sidebar"
import { useBankingData } from "@/lib/hooks"
import { Button } from "@/components/ui/button"
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { Dialog, DialogContent, DialogHeader, DialogTitle } from "@/components/ui/dialog"
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
import { DropdownMenu, DropdownMenuContent, DropdownMenuItem, DropdownMenuTrigger } from "@/components/ui/dropdown-menu"
import {
  Plus,
  MoreVertical,
  Pencil,
  Trash2,
  Folder,
  FolderOpen,
  ChevronRight,
  ChevronDown,
  Building2,
  RefreshCw,
} from "lucide-react"
import { generateId, addFolder, updateFolder, deleteFolder } from "@/lib/store-db"
import type { Folder as FolderType, Account } from "@/lib/types"
import { cn } from "@/lib/utils"

const folderColors = [
  { value: "#6366f1", label: "Indigo" },
  { value: "#22c55e", label: "Vert" },
  { value: "#f59e0b", label: "Orange" },
  { value: "#ec4899", label: "Rose" },
  { value: "#3b82f6", label: "Bleu" },
  { value: "#ef4444", label: "Rouge" },
]

interface FolderTreeItemProps {
  folder: FolderType
  accounts: Account[]
  allFolders: FolderType[]
  level: number
  onEdit: (folder: FolderType) => void
  onDelete: (folderId: string) => void
  formatCurrency: (amount: number) => string
}

function FolderTreeItem({
  folder,
  accounts,
  allFolders,
  level,
  onEdit,
  onDelete,
  formatCurrency,
}: FolderTreeItemProps) {
  const [isExpanded, setIsExpanded] = useState(true)

  // Pour le dossier racine, inclure aussi les comptes sans dossier (folderId: null)
  const folderAccounts = accounts.filter((a) => 
    a.folderId === folder.id || (folder.parentId === null && a.folderId === null)
  )
  const childFolders = allFolders.filter((f) => f.parentId === folder.id)
  const hasChildren = childFolders.length > 0 || folderAccounts.length > 0

  const folderTotal = folderAccounts.reduce((sum, a) => sum + a.balance, 0)

  return (
    <div>
      <div className={cn("flex items-center gap-2 p-2 rounded-lg hover:bg-muted/50 group", level > 0 && "ml-6")}>
        <button
          onClick={() => setIsExpanded(!isExpanded)}
          className="p-1 hover:bg-muted rounded"
          disabled={!hasChildren}
        >
          {hasChildren ? (
            isExpanded ? (
              <ChevronDown className="w-4 h-4 text-muted-foreground" />
            ) : (
              <ChevronRight className="w-4 h-4 text-muted-foreground" />
            )
          ) : (
            <div className="w-4 h-4" />
          )}
        </button>

        <div
          className="w-6 h-6 rounded flex items-center justify-center"
          style={{ backgroundColor: `${folder.color}20` }}
        >
          {isExpanded ? (
            <FolderOpen className="w-4 h-4" style={{ color: folder.color }} />
          ) : (
            <Folder className="w-4 h-4" style={{ color: folder.color }} />
          )}
        </div>

        <span className="flex-1 font-medium text-sm">{folder.name}</span>

        {folderAccounts.length > 0 && (
          <span
            className={cn("text-sm font-semibold tabular-nums", folderTotal >= 0 ? "text-emerald-600" : "text-red-600")}
          >
            {formatCurrency(folderTotal)}
          </span>
        )}

        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button variant="ghost" size="icon" className="h-7 w-7 opacity-0 group-hover:opacity-100">
              <MoreVertical className="w-4 h-4" />
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="end">
            <DropdownMenuItem onClick={() => onEdit(folder)}>
              <Pencil className="w-4 h-4 mr-2" />
              Modifier
            </DropdownMenuItem>
            {folder.id !== "folder-root" && (
              <DropdownMenuItem onClick={() => onDelete(folder.id)} className="text-red-600">
                <Trash2 className="w-4 h-4 mr-2" />
                Supprimer
              </DropdownMenuItem>
            )}
          </DropdownMenuContent>
        </DropdownMenu>
      </div>

      {isExpanded && (
        <div>
          {folderAccounts.map((account) => (
            <div key={account.id} className={cn("flex items-center gap-2 p-2 rounded-lg hover:bg-muted/50", "ml-12")}>
              <Building2 className="w-4 h-4 text-muted-foreground" />
              <span className="flex-1 text-sm">{account.name}</span>
              <span className={cn("text-sm tabular-nums", account.balance >= 0 ? "text-emerald-600" : "text-red-600")}>
                {formatCurrency(account.balance)}
              </span>
            </div>
          ))}

          {childFolders.map((child) => (
            <FolderTreeItem
              key={child.id}
              folder={child}
              accounts={accounts}
              allFolders={allFolders}
              level={level + 1}
              onEdit={onEdit}
              onDelete={onDelete}
              formatCurrency={formatCurrency}
            />
          ))}
        </div>
      )}
    </div>
  )
}

export default function FoldersPage() {
  const { data, isLoading, refresh } = useBankingData()
  const [isDialogOpen, setIsDialogOpen] = useState(false)
  const [editingFolder, setEditingFolder] = useState<FolderType | null>(null)
  const [formData, setFormData] = useState({
    name: "",
    parentId: "folder-root" as string | null,
    color: "#6366f1",
  })

  if (isLoading || !data) {
    return (
      <div className="flex h-screen">
        <Sidebar />
        <main className="flex-1 flex items-center justify-center">
          <RefreshCw className="w-8 h-8 animate-spin text-muted-foreground" />
        </main>
      </div>
    )
  }

  const formatCurrency = (amount: number) => {
    return new Intl.NumberFormat("fr-FR", {
      style: "currency",
      currency: "EUR",
    }).format(amount)
  }

  const rootFolders = data.folders.filter((f) => f.parentId === null)

  const handleNewFolder = () => {
    setEditingFolder(null)
    setFormData({ name: "", parentId: "folder-root", color: "#6366f1" })
    setIsDialogOpen(true)
  }

  const handleEdit = (folder: FolderType) => {
    setEditingFolder(folder)
    setFormData({
      name: folder.name,
      parentId: folder.parentId || "folder-root",
      color: folder.color,
    })
    setIsDialogOpen(true)
  }

  const handleSave = async () => {
    const parentId = formData.parentId === "folder-root" ? null : formData.parentId

    try {
      if (editingFolder) {
        await updateFolder({
          ...editingFolder,
          name: formData.name,
          parentId,
          color: formData.color,
        })
      } else {
        await addFolder({
          name: formData.name,
          parentId,
          color: formData.color,
          icon: "folder",
        })
      }
      refresh()
      setIsDialogOpen(false)
    } catch (error) {
      console.error("Error saving folder:", error)
      alert("Erreur lors de la sauvegarde du dossier")
    }
  }

  const handleDelete = async (folderId: string) => {
    if (!confirm("Supprimer ce dossier ? Les comptes seront déplacés à la racine.")) return

    try {
      await deleteFolder(folderId)
      refresh()
    } catch (error) {
      console.error("Error deleting folder:", error)
      alert("Erreur lors de la suppression du dossier")
    }
  }

  return (
    <div className="flex h-screen bg-background">
      <Sidebar />
      <main className="flex-1 overflow-auto">
        <div className="p-6 space-y-6">
          <div className="flex items-center justify-between">
            <div>
              <h1 className="text-2xl font-bold text-foreground">Organisation</h1>
              <p className="text-muted-foreground">Organisez vos comptes en dossiers</p>
            </div>
            <Button onClick={handleNewFolder}>
              <Plus className="w-4 h-4 mr-2" />
              Nouveau dossier
            </Button>
          </div>

          <Card>
            <CardHeader>
              <CardTitle>Arborescence des comptes</CardTitle>
            </CardHeader>
            <CardContent>
              <div className="space-y-1">
                {rootFolders.map((folder) => (
                  <FolderTreeItem
                    key={folder.id}
                    folder={folder}
                    accounts={data.accounts}
                    allFolders={data.folders}
                    level={0}
                    onEdit={handleEdit}
                    onDelete={handleDelete}
                    formatCurrency={formatCurrency}
                  />
                ))}
              </div>
            </CardContent>
          </Card>
        </div>
      </main>

      <Dialog open={isDialogOpen} onOpenChange={setIsDialogOpen}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>{editingFolder ? "Modifier le dossier" : "Nouveau dossier"}</DialogTitle>
          </DialogHeader>
          <div className="space-y-4">
            <div className="space-y-2">
              <Label>Nom du dossier</Label>
              <Input
                value={formData.name}
                onChange={(e) => setFormData({ ...formData, name: e.target.value })}
                placeholder="Ex: Comptes personnels"
              />
            </div>
            <div className="space-y-2">
              <Label>Dossier parent</Label>
              <Select
                value={formData.parentId || "root"}
                onValueChange={(v) => setFormData({ ...formData, parentId: v === "root" ? null : v })}
              >
                <SelectTrigger>
                  <SelectValue />
                </SelectTrigger>
                <SelectContent>
                  <SelectItem value="root">Racine</SelectItem>
                  {data.folders
                    .filter((f) => f.id !== editingFolder?.id)
                    .map((folder) => (
                      <SelectItem key={folder.id} value={folder.id}>
                        {folder.name}
                      </SelectItem>
                    ))}
                </SelectContent>
              </Select>
            </div>
            <div className="space-y-2">
              <Label>Couleur</Label>
              <div className="flex gap-2">
                {folderColors.map(({ value }) => (
                  <button
                    key={value}
                    onClick={() => setFormData({ ...formData, color: value })}
                    className={cn(
                      "w-8 h-8 rounded-full transition-transform",
                      formData.color === value && "ring-2 ring-offset-2 ring-primary scale-110",
                    )}
                    style={{ backgroundColor: value }}
                  />
                ))}
              </div>
            </div>
            <div className="flex justify-end gap-2">
              <Button variant="outline" onClick={() => setIsDialogOpen(false)}>
                Annuler
              </Button>
              <Button onClick={handleSave} disabled={!formData.name.trim()}>
                {editingFolder ? "Enregistrer" : "Créer"}
              </Button>
            </div>
          </div>
        </DialogContent>
      </Dialog>
    </div>
  )
}