import { h, $ } from "sigpro"
import { get, cls, isFn } from "./sigpro-helpers.js"

export const Editor = (p) => {
  const { value, class: extraClass } = p
  let editorRef = null
  let savedRange = null

  const isSource = $(false)
  const source = $("")
  const count = $(0)
  const refreshTick = $(0)
  const showEmojis = $(false)

  const emojis = ["😀", "😊", "😉", "🧐", "😮", "🤔", "😅", "😂", "😍", "😘", "🥰", "👍", "👎", "👌", "🤝", "🤞", "👋", "👏", "🙌", "🙏", "💪", "☝️", "👇", "👈", "👉", "🖕", "✅", "⚠️", "🚀", "📢", "✉️", "❤️"]

  const saveSelection = () => {
    const sel = window.getSelection()
    if (sel.getRangeAt && sel.rangeCount) savedRange = sel.getRangeAt(0)
  }

  const restoreSelection = () => {
    if (savedRange) {
      const sel = window.getSelection()
      sel.removeAllRanges()
      sel.addRange(savedRange)
    }
  }

  const triggerRefresh = () => {
    refreshTick(refreshTick() + 1)
    if (editorRef) count(editorRef.innerText.length)
  }

  const notify = () => {
    if (!editorRef) return
    const html = editorRef.innerHTML
    if (isFn(value)) value(html)
    else p.onchange?.(html)
    triggerRefresh()
  }

  const exec = (cmd, val = null) => {
    if (!editorRef) return
    editorRef.focus()
    if (savedRange) restoreSelection()
    document.execCommand(cmd, false, val)
    savedRange = null
    notify()
  }

  const openLightbox = (src) => {
    const overlay = document.createElement('div')
    overlay.style = `position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.9);z-index:9999;display:flex;align-items:center;justify-content:center;cursor:zoom-out;`
    const img = document.createElement('img')
    img.src = src
    img.style = `max-width:95%;max-height:95%;box-shadow:0 0 30px rgba(0,0,0,0.5);border-radius:4px;`
    overlay.onclick = () => document.body.removeChild(overlay)
    overlay.appendChild(img)
    document.body.appendChild(overlay)
  }

  const handleUpload = (file) => {
    if (!file) return
    const reader = new FileReader()
    reader.onload = (re) => {
      if (file.type.startsWith('image/')) {
        const imgHtml = `<div style="display:inline-block; resize:both; overflow:hidden; vertical-align:bottom; line-height:0; width:200px; height:auto; border:1px dashed #ccc; padding:2px; cursor:pointer;" class="resizable-img-container"><img src="${re.target.result}" style="width:100%; height:100%; object-fit:contain; pointer-events:none;"></div>&nbsp;`
        exec("insertHTML", imgHtml)
      } else {
        const linkHtml = `<a href="${re.target.result}" download="${file.name}" contenteditable="false" style="display:inline-flex; align-items:center; gap:5px; padding:4px 8px; border:1px solid #ccc; border-radius:4px; background:#f9f9f9; text-decoration:none; color:#333; font-size:12px; margin:2px; cursor:pointer;"><span class="icon-[lucide--paperclip] w-3 h-3"></span>${file.name}</a>&nbsp;`
        exec("insertHTML", linkHtml)
      }
    }
    reader.readAsDataURL(file)
  }

  const queryState = (cmd, val = null) => {
    refreshTick(); if (!editorRef || isSource()) return false
    try {
      if (cmd === 'formatBlock') {
        let node = window.getSelection().getRangeAt(0).commonAncestorContainer
        while (node && node !== editorRef) {
          if (node.nodeType === 1 && node.tagName === val) return true
          node = node.parentNode
        }
        return false
      }
      return document.queryCommandState(cmd)
    } catch (e) { return false }
  }

  const toolbar = h("div", { class: "flex flex-wrap items-center gap-1 p-2 border-b border-base-300 bg-base-200 sticky top-0 z-20" }, [
    h("div", { class: "flex flex-wrap gap-1 flex-1 items-center" }, [
      // GRUPO 1: ESTILOS
      h("button", { type: "button", class: () => `btn btn-ghost btn-xs ${queryState('bold') ? 'btn-active bg-primary/20' : ''}`, onclick: () => exec("bold") }, h("span", { class: "icon-[lucide--bold]" })),
      h("button", { type: "button", class: () => `btn btn-ghost btn-xs ${queryState('italic') ? 'btn-active bg-primary/20' : ''}`, onclick: () => exec("italic") }, h("span", { class: "icon-[lucide--italic]" })),
      h("button", { type: "button", class: () => `btn btn-ghost btn-xs ${queryState('underline') ? 'btn-active bg-primary/20' : ''}`, onclick: () => exec("underline") }, h("span", { class: "icon-[lucide--underline]" })),
      h("input", { type: "color", class: "w-5 h-5 p-0 border-0 bg-transparent cursor-pointer", oninput: (e) => exec("foreColor", e.target.value) }),

      h("span", { class: "w-px h-5 bg-base-300 mx-1" }),

      h("button", {
        type: "button",
        class: "btn btn-ghost btn-xs",
        onclick: () => exec("justifyLeft")
      }, h("span", { class: "icon-[lucide--align-left]" })),

      // --- Botón Alineación Centro ---
      h("button", {
        type: "button",
        class: "btn btn-ghost btn-xs",
        onclick: () => exec("justifyCenter")
      }, h("span", { class: "icon-[lucide--align-center]" })),

      // --- Botón Alineación Derecha ---
      h("button", {
        type: "button",
        class: "btn btn-ghost btn-xs",
        onclick: () => exec("justifyRight")
      }, h("span", { class: "icon-[lucide--align-right]" })),

      h("span", { class: "w-px h-5 bg-base-300 mx-1" }),

      // GRUPO 2: LISTAS Y PÁRRAFO
      h("button", { type: "button", class: "btn btn-ghost btn-xs", onclick: () => exec("insertUnorderedList") }, h("span", { class: "icon-[lucide--list]" })),
      h("button", { type: "button", class: "btn btn-ghost btn-xs", onclick: () => exec("insertOrderedList") }, h("span", { class: "icon-[lucide--list-ordered]" })),
      h("button", { type: "button", class: "btn btn-ghost btn-xs", onclick: () => exec("outdent") }, h("span", { class: "icon-[lucide--indent-decrease]" })),
      h("button", { type: "button", class: "btn btn-ghost btn-xs", onclick: () => exec("indent") }, h("span", { class: "icon-[lucide--indent-increase]" })),
      h("button", { type: "button", class: () => `btn btn-ghost btn-xs ${queryState('formatBlock', 'BLOCKQUOTE') ? 'btn-active' : ''}`, onclick: () => exec("formatBlock", queryState('formatBlock', 'BLOCKQUOTE') ? 'P' : 'BLOCKQUOTE') }, h("span", { class: "icon-[lucide--quote]" })),

      h("span", { class: "w-px h-5 bg-base-300 mx-1" }),

      // GRUPO 3: INSERTAR
      h("button", { type: "button", class: "btn btn-ghost btn-xs", onclick: () => { const url = window.prompt('URL:'); if (url) exec("createLink", url) } }, h("span", { class: "icon-[lucide--link]" })),
      h("button", { type: "button", class: "btn btn-ghost btn-xs", onclick: () => { const input = document.createElement('input'); input.type = 'file'; input.onchange = (e) => handleUpload(e.target.files[0]); input.click(); } }, h("span", { class: "icon-[lucide--paperclip]" })),

      // EMOJIS
      h("div", { class: "relative" }, [
        h("button", { type: "button", class: "btn btn-ghost btn-xs", onclick: (e) => { e.stopPropagation(); saveSelection(); showEmojis(!showEmojis()); } }, h("span", { class: "icon-[lucide--smile]" })),
        h("div", { class: "absolute top-full left-0 mt-1 p-2 bg-base-100 border border-base-300 shadow-xl rounded-box w-52 z-50 flex flex-wrap gap-1", style: () => showEmojis() ? "display:flex" : "display:none" }, emojis.map(emo => h("span", { class: "cursor-pointer hover:bg-base-200 p-1 rounded text-lg", onclick: (e) => { e.stopPropagation(); exec("insertText", emo); showEmojis(false); } }, emo)))
      ]),

      h("span", { class: "w-px h-5 bg-base-300 mx-1" }),

      // GRUPO 4: UTILIDADES
      h("button", { type: "button", class: "btn btn-ghost btn-xs", onclick: () => exec("undo") }, h("span", { class: "icon-[lucide--undo-2]" })),
      h("button", { type: "button", class: "btn btn-ghost btn-xs", onclick: () => exec("redo") }, h("span", { class: "icon-[lucide--redo-2]" })),
    ]),

    h("button", { type: "button", class: () => `btn btn-ghost btn-xs ${isSource() ? 'btn-active' : ''}`, onclick: () => { if (!isSource()) source(editorRef?.innerHTML || ""); else if (editorRef) { editorRef.innerHTML = source(); notify(); }; isSource(!isSource()) } }, h("span", { class: "icon-[lucide--code-2]" }))
  ])

  if (typeof document !== 'undefined' && !document.getElementById('editor-styles')) {
    const style = document.createElement('style')
    style.id = 'editor-styles'
    style.textContent = `
    [contenteditable="true"] div,
    [contenteditable="true"] p {
      margin: 0;
      padding: 0;
    }
  `
    document.head.appendChild(style)
  }
  return h("div", { class: cls("border border-base-300 rounded-box bg-base-100 overflow-hidden shadow-sm flex flex-col", extraClass) }, [
    toolbar,
    h("div", { class: "relative flex-1 flex flex-col", onclick: () => showEmojis(false) }, [
      h("div", {
        ref: el => {
          if (!editorRef && el) {
            editorRef = el; el.innerHTML = get(value) || "";
            document.execCommand("defaultParagraphSeparator", false, "br");
            el.addEventListener('click', (e) => {
              const container = e.target.closest('.resizable-img-container');
              if (container) { const img = container.querySelector('img'); if (img) openLightbox(img.src); }
            });
          }
        },
        style: () => `min-height:22rem;${isSource() ? 'display:none' : ''}`,
        class: "p-4 outline-none text-base-content leading-relaxed [&>div]:m-0 [&>p]:m-0 [&>div]:min-h-[1em] [&_.resizable-img-container]:hover:border-primary [&_blockquote]:border-l-4 [&_blockquote]:border-base-300 [&_blockquote]:pl-4 [&_blockquote]:italic [&_ul]:list-disc [&_ul]:pl-8 [&_ol]:list-decimal [&_ol]:pl-8",
        contenteditable: "true",
        oninput: notify,
        onkeydown: (e) => { if (e.key === 'Tab') { e.preventDefault(); exec("indent"); } },
        onkeyup: () => { triggerRefresh(); saveSelection(); },
        onclick: (e) => { triggerRefresh(); saveSelection(); e.stopPropagation(); },
        onmouseup: () => { notify(); saveSelection(); },
        onpaste: (e) => {
          e.preventDefault();
          const text = e.clipboardData.getData('text/plain');
          exec('insertText', text);
        },
        ondragover: (e) => e.preventDefault(),
        ondrop: (e) => { e.preventDefault(); handleUpload(e.dataTransfer.files[0]) }
      }),
      h("textarea", {
        class: "w-full flex-1 min-h-[22rem] p-4 outline-none font-mono text-sm bg-base-200 border-0",
        style: () => isSource() ? '' : 'display:none',
        value: source,
        oninput: (e) => { source(e.target.value); if (editorRef) editorRef.innerHTML = e.target.value; p.onchange?.(e.target.value); }
      })
    ]),
    h("div", { class: "px-3 py-1 border-t border-base-300 bg-base-100/50 text-[10px] text-right text-base-content/60 italic" }, [
      h("span", () => `${count()} caracteres`)
    ])
  ])
}