"use client"

import { memo, useRef } from "react"
import type { DocPageLayout } from "@/lib/drive/doc-page-setup"
import { DOCS_HORIZONTAL_RULER_HEIGHT_PX } from "@/lib/drive/docs-page-layout-constants"
import { docsPageLengthToScreen } from "@/lib/drive/docs-ruler-scale"
import type { DocsParagraphIndents } from "@/lib/drive/use-docs-ruler-sync"
import { buildHorizontalRulerTicks } from "@/lib/drive/docs-ruler-math"
import type { DocsRulerMarginSide } from "@/lib/drive/docs-ruler-margin-math"
import {
  DocsRulerDraggableHandle,
  DocsRulerFirstLineMarker,
  DocsRulerTriangleMarker,
  useRulerPointerDrag,
} from "@/components/drive/richtext/docs-ruler-markers"

function DocsHorizontalRulerInner({
  pageLayout,
  scale,
  indents,
  editable,
  onMarginDragStart,
  onMarginDrag,
  onMarginDragEnd,
}: {
  pageLayout: DocPageLayout
  scale: number
  indents: DocsParagraphIndents
  editable?: boolean
  onMarginDragStart?: (side: DocsRulerMarginSide) => void
  onMarginDrag?: (side: DocsRulerMarginSide, pagePx: number, clientX: number, clientY: number) => void
  onMarginDragEnd?: () => void
}) {
  const rulerRef = useRef<HTMLDivElement>(null)
  const pageWidth = pageLayout.widthPx
  const margins = pageLayout.marginsPx
  const scaledWidth = docsPageLengthToScreen(pageWidth, scale)
  const ticks = buildHorizontalRulerTicks(pageWidth, pageLayout.format.id)
  const s = (px: number) => docsPageLengthToScreen(px, scale)

  const leftDrag = useRulerPointerDrag({
    rulerRef,
    axis: "horizontal",
    disabled: !editable,
    onDrag: (pagePx, clientX, clientY) => onMarginDrag?.("left", pagePx, clientX, clientY),
    onDragEnd: () => onMarginDragEnd?.(),
  })

  const rightDrag = useRulerPointerDrag({
    rulerRef,
    axis: "horizontal",
    disabled: !editable,
    onDrag: (pagePx, clientX, clientY) => onMarginDrag?.("right", pagePx, clientX, clientY),
    onDragEnd: () => onMarginDragEnd?.(),
  })

  const wrapMarginDown =
    (side: DocsRulerMarginSide, handler: (e: React.PointerEvent<HTMLDivElement>) => void) =>
    (event: React.PointerEvent<HTMLDivElement>) => {
      onMarginDragStart?.(side)
      handler(event)
    }

  return (
    <div
      ref={rulerRef}
      data-docs-ruler="horizontal"
      data-docs-ruler-scale={scale}
      className="docs-horizontal-ruler relative overflow-visible bg-transparent"
      style={{
        width: scaledWidth,
        height: DOCS_HORIZONTAL_RULER_HEIGHT_PX,
      }}
    >
      <div
        className="absolute top-0 h-full bg-transparent"
        style={{ left: 0, width: s(margins.left) }}
      />
      <div
        className="absolute top-0 h-full bg-transparent"
        style={{ left: s(pageWidth - margins.right), width: s(margins.right) }}
      />

      {ticks.map((tick, index) => (
        <div
          key={`${tick.pos}-${index}`}
          className="pointer-events-none absolute bottom-0 w-px bg-[#80868b] dark:bg-muted-foreground/70"
          style={{
            left: s(tick.pos),
            height: tick.major ? 10 : 5,
          }}
        />
      ))}

      {ticks
        .filter((tick) => tick.major && tick.label != null)
        .map((tick) => (
          <span
            key={`label-${tick.pos}`}
            className="pointer-events-none absolute top-[2px] -translate-x-1/2 text-[9px] leading-none text-[#5f6368] dark:text-muted-foreground"
            style={{ left: s(tick.pos) }}
          >
            {tick.label}
          </span>
        ))}

      <DocsRulerDraggableHandle
        style={{ left: s(margins.left) }}
        axis="horizontal"
        disabled={!editable}
        ariaLabel="Marge gauche"
        onPointerDown={wrapMarginDown("left", leftDrag.onPointerDown)}
      >
        <DocsRulerTriangleMarker left={0} className="relative" />
      </DocsRulerDraggableHandle>

      <DocsRulerDraggableHandle
        style={{ left: s(pageWidth - margins.right) }}
        axis="horizontal"
        disabled={!editable}
        ariaLabel="Marge droite"
        onPointerDown={wrapMarginDown("right", rightDrag.onPointerDown)}
      >
        <DocsRulerTriangleMarker left={0} className="relative" />
      </DocsRulerDraggableHandle>

      <DocsRulerTriangleMarker
        left={s(indents.leftPx)}
        className="pointer-events-none absolute bottom-0 -translate-x-1/2"
      />

      {Math.abs(indents.firstLinePx - indents.leftPx) > 1 ? (
        <DocsRulerFirstLineMarker left={s(indents.firstLinePx)} />
      ) : null}
    </div>
  )
}

export const DocsHorizontalRuler = memo(DocsHorizontalRulerInner)
