import fabric from '../PictureEditor/js/fabric-adapter'
import { buildRenderPlans, normalizeGoods } from './generateImagesPlan'

/**
 * 根据渲染计划和拍平后的货号数据，真正生成图片（dataURL），按 canvasIndex & imageIndex 返回。
 *
 * 注意：
 * - 不做任何上传，只返回 dataURL，方便在 EXE 或其他环境里落地到本地文件。
 * - 需要在外部保证 canvasList / plans / skus 的来源一致。
 *
 * @param {Array} plans 由 buildRenderPlans 生成的渲染计划
 * @param {Array} canvasList 画布配置数组（包含 canvas_json / width / height / bg_color 等）
 * @param {Array} skus normalizeGoods(goodsList) 的结果
 * @returns {Promise<Array<{canvasIndex:number,imageIndex:number,dataUrl:string,skuIndexes:number[],skus:any[]}>>}
 */
export async function renderImagesByPlans(plans, canvasList, skus) {
  const results = []

  // 工具：从 canvas_json 创建一个离屏 fabric.Canvas，并应用一次性的渲染逻辑
  const renderOne = (canvasItem, planForCanvas, imagePlan) =>
    new Promise((resolve) => {
      if (!canvasItem || !canvasItem.canvas_json) {
        return resolve(null)
      }

      const { canvasIndex } = planForCanvas
      const { imageIndex, skuIndexes } = imagePlan

      // 解析 JSON 为可修改的对象
      let json
      try {
        json = typeof canvasItem.canvas_json === 'string'
          ? JSON.parse(canvasItem.canvas_json)
          : JSON.parse(JSON.stringify(canvasItem.canvas_json))
      } catch (e) {
        console.warn('[generateImagesRender] parse canvas_json failed', e)
        return resolve(null)
      }

      const width = Number(canvasItem.width) || 395
      const height = Number(canvasItem.height) || 600
      const bgColor = canvasItem.bg_color || '#fff'

      try {
        const mode = canvasItem.multi_goods_mode || ''
        const perCanvasSlots = planForCanvas.perCanvasSlots || 1
        const usedSkus = (skuIndexes || []).map((idx) => (idx != null ? skus[idx] : null))

        // 先在原始 JSON 上做数据替换，避免 setSrc 的异步问题；
        // loadFromJSON 会在所有图片加载完成后才触发回调。
        const objs = (json && Array.isArray(json.objects)) ? json.objects : []

        // 1) 处理图片占位（data-type = img）
        const imgPlaceholders = objs.filter((o) => o && o['data-type'] === 'img')

        if (mode === 'multiple') {
          // 多个货号同角度：同一画布中，有多个 img 占位，按顺序对应 skuIndexes
          imgPlaceholders.forEach((obj, idx) => {
            const slotIndex = idx % perCanvasSlots
            const sku = usedSkus[slotIndex]
            if (!sku) {
              obj.visible = false
              return
            }
            const angleKey = obj['data-key']
            const url = (sku.pics && sku.pics[angleKey]) || ''
            if (!url) {
              obj.visible = false
              return
            }
            obj.visible = true
            obj['data-value'] = url
            obj.src = url
          })
        } else {
          // 默认 / single：一个货号多角度，一张图只用一个货号
          const sku = usedSkus[0]
          imgPlaceholders.forEach((obj) => {
            if (!sku) {
              obj.visible = false
              return
            }
            const angleKey = obj['data-key']
            const url = (sku.pics && sku.pics[angleKey]) || ''
            if (!url) {
              obj.visible = false
              return
            }
            obj.visible = true
            obj['data-value'] = url
            obj.src = url
          })
        }

        // 2) 处理文字占位（data-type = text）
        const textPlaceholders = objs.filter((o) => o && o['data-type'] === 'text')

        if (textPlaceholders.length) {
          // 通用的 key -> 文本 映射函数，
          const mapKeyToText = (sku, key, defaultVal) => {
            if (!sku) return defaultVal
            let textVal = defaultVal || ''
            if (key === '颜色') {
              textVal = sku.color || textVal
            } else if (key === '货号') {
              textVal = sku.sku || textVal
            }
            // 兜底：去 raw 里找同名字段（支持 卖点 / 使用场景 / 其他自定义字段）
            if ((!textVal || textVal === defaultVal) && sku.raw && sku.raw[key] != null) {
              textVal = sku.raw[key]
            }
            // 再兜底：如果 sku 上有同名字段
            if ((!textVal || textVal === defaultVal) && sku[key] != null) {
              textVal = sku[key]
            }
            return textVal
          }

          if (mode === 'multiple') {
            // 多个货号同角度：
            // - 按 data-key + 出现顺序把文字分配给不同货号
            // - 如果该 slot 没有对应货号（usedSkus[slotIndex] 为 null），则隐藏该文字层
            const keyCounter = {}
            textPlaceholders.forEach((obj) => {
              const key = obj['data-key']
              if (!key) return
              const idxForKey = keyCounter[key] || 0
              keyCounter[key] = idxForKey + 1

              const slotIndex = idxForKey % perCanvasSlots
              const sku = usedSkus[slotIndex]
              if (!sku) {
                obj.visible = false
                return
              }

              const origin = obj['data-value'] || ''
              const textVal = mapKeyToText(sku, key, origin)

              obj.visible = true
              obj.text = textVal
              obj['data-value'] = textVal
            })
          } else {
            // 默认 / single：全部文字都使用同一个货号（默认模式只生成 1 张，用第一个货号）
            const sku = usedSkus[0]
            if (sku) {
              textPlaceholders.forEach((obj) => {
                const key = obj['data-key']
                if (!key) return
                const origin = obj['data-value'] || ''
                const textVal = mapKeyToText(sku, key, origin)

                obj.visible = true
                obj.text = textVal
                obj['data-value'] = textVal
              })
            }
          }
        }

        // 创建离屏 canvas
        const el = document.createElement('canvas')
        el.width = width
        el.height = height

        const fcanvas = new fabric.Canvas(el, {
          backgroundColor: bgColor,
          width,
          height,
          renderOnAddRemove: false,
        })

        // 把已经替换好动态数据的 JSON 加载进 fabric；
        // loadFromJSON 会等所有图片资源加载完之后才调用回调函数
        fcanvas.loadFromJSON(json, () => {
          try {
            fcanvas.renderAll()
            const dataUrl = fcanvas.toDataURL({
              format: 'jpeg',
              multiplier:2,
              enableRetinaScaling: true,
            })

            fcanvas.dispose()

            resolve({
              canvasIndex,
              imageIndex,
              dataUrl,
              skuIndexes,
              skus: usedSkus,
            })
          } catch (e) {
            console.warn('[generateImagesRender] render one failed in callback', e)
            try {
              fcanvas.dispose()
            } catch (e2) {}
            resolve(null)
          }
        })
      } catch (e) {
        console.warn('[generateImagesRender] render one failed', e)
        resolve(null)
      }
    })

  for (const plan of plans || []) {
    const canvasItem = canvasList[plan.canvasIndex]
    if (!canvasItem) continue

    for (const imgPlan of plan.images || []) {
      // eslint-disable-next-line no-await-in-loop
      const res = await renderOne(canvasItem, plan, imgPlan)
      if (res) results.push(res)
    }
  }

  return results
}

/**
 * 针对每个款号（style），按画布生成所有图片，并额外生成「所有画布组合在一起」的一张长图。
 *
 * @param {Array} canvasList 画布配置数组
 * @param {Array} goodsList  原始商品数据数组 [goods, goods1, ...]
 * @returns {Promise<Array<{
 *   styleKey: string,
 *   styleNo: string,
 *   images: Array<{canvasIndex:number,imageIndex:number,dataUrl:string,skuIndexes:number[],skus:any[]}>,
 *   combined?: { dataUrl: string, width: number, height: number }
 * }>>}
 */
export async function generateAllStyleImageBundles(canvasList, goodsList) {
  const bundles = []

  // 工具：把若干 dataURL 竖向拼接为一张长图
  const composeCombinedImage = (images) =>
    new Promise((resolve) => {
      if (!images || !images.length) return resolve(null)

      Promise.all(
        images.map(img =>
          new Promise(res => {
            fabric.Image.fromURL(
              img.dataUrl,
              (oImg) => res(oImg),
              { crossOrigin: 'anonymous' }
            )
          })
        )
      ).then(fabricImages => {
        const widths = fabricImages.map(i => i.width * (i.scaleX || 1))
        const heights = fabricImages.map(i => i.height * (i.scaleY || 1))
        const totalHeight = heights.reduce((a, b) => a + b, 0)
        const maxWidth = widths.reduce((a, b) => Math.max(a, b), 0)

        const el = document.createElement('canvas')
        el.width = maxWidth
        el.height = totalHeight

        const canvas = new fabric.Canvas(el, {
          backgroundColor: '#fff',
          width: maxWidth,
          height: totalHeight,
          renderOnAddRemove: false,
        })

        let currentTop = 0
        fabricImages.forEach((img, idx) => {
          const w = widths[idx]
          const h = heights[idx]
          img.set({
            left: (maxWidth - w) / 2,
            top: currentTop,
          })
          currentTop += h
          canvas.add(img)
        })

        canvas.renderAll()
        const dataUrl = canvas.toDataURL({
          format: 'jpeg',
          multiplier:2,
          enableRetinaScaling: true,
        })
        const result = { dataUrl, width: maxWidth, height: totalHeight }
        canvas.dispose()
        resolve(result)
      }).catch(() => resolve(null))
    })

  // 按款号分组处理，避免不同款号的货号混在一起
  for (const group of goodsList || []) {
    if (!group) continue
    for (const [styleKey, entry] of Object.entries(group)) {
      if (!entry || !Array.isArray(entry['货号资料'])) continue
      const styleNo = entry['款号'] || styleKey
      const styleGoodsList = [{ [styleKey]: entry }]

      const plans = buildRenderPlans(canvasList, styleGoodsList)
      const skus = normalizeGoods(styleGoodsList)
      if (!plans.length || !skus.length) continue

      // eslint-disable-next-line no-await-in-loop
      const images = await renderImagesByPlans(plans, canvasList, skus)
      if (!images.length) continue

      // 按 canvasIndex、imageIndex 排序，方便后续命名和组合
      images.sort((a, b) => {
        if (a.canvasIndex !== b.canvasIndex) return a.canvasIndex - b.canvasIndex
        return a.imageIndex - b.imageIndex
      })

      // 组合所有画布图片为一张长图（可以根据需要选择只取每个画布的第一张等）
      const combined = await composeCombinedImage(images)

      bundles.push({
        styleKey,
        styleNo,
        images,
        combined,
      })
    }
  }

  return bundles
}