"use client"

import { useEffect, useRef, useState } from "react"
import { cn } from "@/lib/utils"

const FIELD_BASE =
  "col-start-1 row-start-1 w-full min-w-0 rounded-md border border-transparent bg-transparent px-2 py-0.5 text-left text-sm font-medium outline-none transition-[background-color,border-color]"

export function OfficeEditorInlineTitle({
  value,
  onRename,
  disabled = false,
  className,
  renameSignal,
}: {
  value: string
  onRename: (next: string) => Promise<void>
  disabled?: boolean
  className?: string
  /** Increment to start inline rename from an external action (e.g. menu Fichier). */
  renameSignal?: number
}) {
  const [editing, setEditing] = useState(false)
  const [draft, setDraft] = useState(value)
  const [busy, setBusy] = useState(false)
  const inputRef = useRef<HTMLInputElement>(null)
  const skipBlurCommitRef = useRef(false)

  useEffect(() => {
    if (!editing) setDraft(value)
  }, [value, editing])

  useEffect(() => {
    if (!renameSignal || disabled) return
    setEditing(true)
  }, [renameSignal, disabled])

  useEffect(() => {
    if (!editing) return
    const timer = window.setTimeout(() => {
      const el = inputRef.current
      if (!el) return
      el.focus()
      el.select()
    }, 0)
    return () => window.clearTimeout(timer)
  }, [editing])

  const cancelEdit = () => {
    skipBlurCommitRef.current = true
    setDraft(value)
    setEditing(false)
  }

  const commitEdit = async () => {
    if (skipBlurCommitRef.current) {
      skipBlurCommitRef.current = false
      return
    }
    const trimmed = draft.trim()
    if (!trimmed || trimmed === value) {
      setDraft(value)
      setEditing(false)
      return
    }
    setBusy(true)
    try {
      await onRename(trimmed)
      setEditing(false)
    } catch {
      setDraft(value)
      setEditing(false)
    } finally {
      setBusy(false)
    }
  }

  const mirrorText = (editing ? draft : value) || " "
  const fieldClass = cn(FIELD_BASE, className)

  return (
    <div className="inline-grid w-fit max-w-[min(480px,45vw)]">
      <span
        className={cn(fieldClass, "invisible whitespace-pre")}
        aria-hidden
      >
        {mirrorText}
      </span>

      {editing && !disabled ? (
        <input
          ref={inputRef}
          value={draft}
          disabled={busy}
          aria-label="Nom du fichier"
          className={cn(
            fieldClass,
            "text-foreground focus-visible:border-border focus-visible:ring-0"
          )}
          onChange={(event) => setDraft(event.target.value)}
          onKeyDown={(event) => {
            if (event.key === "Enter") {
              event.preventDefault()
              void commitEdit()
            }
            if (event.key === "Escape") {
              event.preventDefault()
              cancelEdit()
            }
          }}
          onBlur={() => void commitEdit()}
        />
      ) : (
        <button
          type="button"
          disabled={disabled || busy}
          title={disabled ? undefined : "Renommer"}
          className={cn(
            fieldClass,
            "truncate text-foreground",
            disabled
              ? "cursor-default"
              : "cursor-text hover:bg-muted/70 focus-visible:border-border focus-visible:ring-0"
          )}
          onClick={() => {
            if (!disabled && !busy) setEditing(true)
          }}
        >
          {value}
        </button>
      )}
    </div>
  )
}
