// plugins/draggable.client.ts
import { defineNuxtPlugin } from '#app'

export default defineNuxtPlugin((nuxtApp) => {
    // 拖拽指令
    nuxtApp.vueApp.directive('draggable', {
        mounted(el, binding) {
            // 只在客户端执行
            if (import.meta.server) return

            const triggerSelector = binding.value?.triggerSelector || '.el-dialog__header'
            const dialogHeaderEl = el.querySelector(triggerSelector) as HTMLElement
            const dialogEl = el.querySelector('.el-dialog') as HTMLElement

            if (!dialogHeaderEl || !dialogEl) return

            let isDragging = false
            let offsetX = 0
            let offsetY = 0

            const startDrag = (e: MouseEvent) => {
                isDragging = true
                const rect = dialogEl.getBoundingClientRect()
                offsetX = e.clientX - rect.left
                offsetY = e.clientY - rect.top
                dialogEl.style.cursor = 'move'
            }

            const onDrag = (e: MouseEvent) => {
                if (!isDragging) return

                const x = e.clientX - offsetX
                const y = e.clientY - offsetY

                // 边界限制
                const maxX = window.innerWidth - dialogEl.offsetWidth
                const maxY = window.innerHeight - dialogEl.offsetHeight

                dialogEl.style.left = `${Math.max(0, Math.min(x, maxX))}px`
                dialogEl.style.top = `${Math.max(0, Math.min(y, maxY))}px`
            }

            const stopDrag = () => {
                isDragging = false
                dialogEl.style.cursor = ''
            }

            dialogHeaderEl.addEventListener('mousedown', startDrag)
            document.addEventListener('mousemove', onDrag)
            document.addEventListener('mouseup', stopDrag)

                // 清理函数
                ; (el as any)._dragCleanup = () => {
                    dialogHeaderEl.removeEventListener('mousedown', startDrag)
                    document.removeEventListener('mousemove', onDrag)
                    document.removeEventListener('mouseup', stopDrag)
                }
        },

        unmounted(el) {
            ; (el as any)._dragCleanup?.()
        }
    })
})