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

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

  const isSource = $(false)
  const source = $("")

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

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

  const queryState = (cmd, val = null) => {
    if (!editorRef) return false
    try {
      if (cmd === 'formatBlock') {
        const sel = window.getSelection()
        if (!sel.rangeCount) return false
        let node = sel.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" }, [
    h("div", { class: "flex flex-wrap gap-1 flex-1" }, [
      h("button", {
        type: "button",
        class: () => `btn btn-ghost btn-xs ${queryState('bold') ? 'btn-active' : ''}`,
        onclick: () => exec("bold")
      }, h("span", { class: "icon-[lucide--bold]" })),
      
      h("button", {
        type: "button",
        class: () => `btn btn-ghost btn-xs ${queryState('italic') ? 'btn-active' : ''}`,
        onclick: () => exec("italic")
      }, h("span", { class: "icon-[lucide--italic]" })),
      
      h("button", {
        type: "button",
        class: () => `btn btn-ghost btn-xs ${queryState('underline') ? 'btn-active' : ''}`,
        onclick: () => exec("underline")
      }, h("span", { class: "icon-[lucide--underline]" })),
      
      h("button", {
        type: "button",
        class: () => `btn btn-ghost btn-xs ${queryState('strikeThrough') ? 'btn-active' : ''}`,
        onclick: () => exec("strikeThrough")
      }, h("span", { class: "icon-[lucide--strikethrough]" })),

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

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

      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" }),

      h("select", { class: "select select-xs w-16", onchange: (e) => exec("fontSize", e.target.value), value: "3" }, [
        h("option", { value: "1" }, "1"),
        h("option", { value: "2" }, "2"),
        h("option", { value: "3" }, "3"),
        h("option", { value: "4" }, "4"),
        h("option", { value: "5" }, "5"),
        h("option", { value: "6" }, "6"),
        h("option", { value: "7" }, "7"),
      ]),

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

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

  return h("div", { class: cls("border border-base-300 rounded-box bg-base-100 overflow-hidden", extraClass) }, [
    toolbar,
    h("div", { class: "relative" }, [
      h("div", {
        ref: el => {
          if (!editorRef && el) {
            editorRef = el
            el.innerHTML = get(value) || ""
          }
        },
        style: () => `min-height:10rem;${isSource() ? 'display:none' : ''}`,
        class: "p-3 outline-none text-base-content [&_ul]:list-disc [&_ul]:pl-6 [&_ol]:list-decimal [&_ol]:pl-6 [&_li]:list-item [&_p]:m-0 [&_div]:m-0 [&_br]:content-[''] [&_br]:block [&_br]:h-[1em]",
        contenteditable: "true",
        oninput: notify,
        onpaste: () => setTimeout(notify, 0)
      }),
      h("textarea", {
        class: "w-full min-h-[10rem] p-3 outline-none font-mono text-sm bg-base-200 border-0",
        style: () => isSource() ? '' : 'display:none',
        value: source,
        oninput: (e) => source(e.target.value)
      })
    ])
  ])
}