/**
 * Word文档生成器
 * 使用docx库生成专业的Word文档
 */

import {
  Document,
  Paragraph,
  TextRun,
  HeadingLevel,
  ImageRun,
  TableOfContents,
  PageBreak,
  AlignmentType,
  Table,
  TableRow,
  TableCell,
  WidthType,
  BorderStyle,
} from "docx"

interface DocumentSection {
  title: string
  path: string
  description: string
  screenshot: string
}

interface DocumentData {
  title: string
  author: string
  date: string
  sections: DocumentSection[]
}

/**
 * 生成Word文档
 * @param data 文档数据
 * @returns 文档的blob URL
 */
export async function generateDocx(data: DocumentData): Promise<string> {
  console.log("开始生成Word文档...")

  try {
    // 验证输入数据
    if (!data) {
      throw new Error("文档数据不能为空")
    }

    if (!Array.isArray(data.sections)) {
      console.warn("sections不是数组，使用空数组代替")
      data.sections = []
    }

    console.log(`文档标题: ${data.title}`)
    console.log(`作者: ${data.author}`)
    console.log(`日期: ${data.date}`)
    console.log(`部分数量: ${data.sections.length}`)

    // 创建文档
    const doc = new Document({
      title: data.title,
      description: "由文档生成工具自动生成",
      creator: data.author,
      styles: {
        paragraphStyles: [
          {
            id: "Normal",
            name: "Normal",
            run: {
              size: 24, // 12pt
              font: "Microsoft YaHei",
            },
            paragraph: {
              spacing: {
                line: 360, // 1.5倍行距
                before: 240, // 12pt
                after: 240, // 12pt
              },
            },
          },
          {
            id: "Heading1",
            name: "Heading 1",
            run: {
              size: 36, // 18pt
              bold: true,
              font: "Microsoft YaHei",
            },
            paragraph: {
              spacing: {
                before: 480, // 24pt
                after: 240, // 12pt
              },
            },
          },
          {
            id: "Heading2",
            name: "Heading 2",
            run: {
              size: 32, // 16pt
              bold: true,
              font: "Microsoft YaHei",
            },
            paragraph: {
              spacing: {
                before: 360, // 18pt
                after: 240, // 12pt
              },
            },
          },
          {
            id: "Caption",
            name: "Caption",
            run: {
              size: 20, // 10pt
              italic: true,
              font: "Microsoft YaHei",
            },
            paragraph: {
              alignment: AlignmentType.CENTER,
              spacing: {
                before: 120, // 6pt
                after: 240, // 12pt
              },
            },
          },
        ],
      },
    })

    // 文档部分
    const sections = []

    // 封面
    sections.push({
      properties: {},
      children: [
        new Paragraph({
          text: "",
          spacing: {
            before: 3000, // 大约页面1/3处
          },
        }),
        new Paragraph({
          text: data.title,
          heading: HeadingLevel.TITLE,
          alignment: AlignmentType.CENTER,
          spacing: {
            after: 400,
          },
        }),
        new Paragraph({
          text: "",
          spacing: {
            before: 800,
          },
        }),
        new Paragraph({
          alignment: AlignmentType.CENTER,
          children: [
            new TextRun({
              text: `作者: ${data.author}`,
              size: 24,
            }),
          ],
        }),
        new Paragraph({
          alignment: AlignmentType.CENTER,
          children: [
            new TextRun({
              text: `生成日期: ${data.date}`,
              size: 24,
            }),
          ],
        }),
        new Paragraph({
          text: "",
          break: PageBreak.AFTER,
        }),
      ],
    })

    // 目录
    sections.push({
      properties: {},
      children: [
        new Paragraph({
          text: "目录",
          heading: HeadingLevel.HEADING_1,
          alignment: AlignmentType.CENTER,
        }),
        new TableOfContents("目录", {
          hyperlink: true,
          headingStyleRange: "1-3",
        }),
        new Paragraph({
          text: "",
          break: PageBreak.AFTER,
        }),
      ],
    })

    // 正文
    const contentSection = {
      properties: {},
      children: [] as any[],
    }

    // 添加简介
    contentSection.children.push(
      new Paragraph({
        text: "1. 简介",
        heading: HeadingLevel.HEADING_1,
      }),
      new Paragraph({
        text: "本文档由文档生成工具自动生成，包含应用程序的所有主要页面截图和功能说明。",
      }),
      new Paragraph({
        text: "文档目的是帮助用户了解系统功能和使用方法，为系统管理员和最终用户提供参考。",
      }),
      new Paragraph({
        text: "",
      }),
    )

    // 添加页面内容
    contentSection.children.push(
      new Paragraph({
        text: "2. 系统功能",
        heading: HeadingLevel.HEADING_1,
      }),
    )

    // 处理每个部分
    console.log("开始处理文档部分...")

    // 使用for循环而不是forEach，以便更好地处理错误
    for (let i = 0; i < data.sections.length; i++) {
      try {
        const section = data.sections[i]
        console.log(`处理部分 ${i + 1}/${data.sections.length}: ${section.title}`)

        // 验证部分数据
        if (!section.title) {
          console.warn(`部分 ${i + 1} 缺少标题，使用默认标题`)
          section.title = `页面 ${i + 1}`
        }

        if (!section.description) {
          console.warn(`部分 ${i + 1} 缺少描述，使用默认描述`)
          section.description = `这是 ${section.title} 页面的描述。`
        }

        // 添加标题
        contentSection.children.push(
          new Paragraph({
            text: `2.${i + 1} ${section.title}`,
            heading: HeadingLevel.HEADING_2,
          }),
        )

        // 添加描述
        const descriptionParagraphs = section.description.split("\n")
        for (const paragraph of descriptionParagraphs) {
          contentSection.children.push(
            new Paragraph({
              text: paragraph,
            }),
          )
        }

        // 添加截图
        try {
          if (section.screenshot && section.screenshot.startsWith("data:image/")) {
            console.log(`处理截图: ${section.title}`)

            // 从base64数据URL中提取图像数据
            const base64Data = section.screenshot.split(",")[1]
            if (!base64Data) {
              throw new Error("无效的base64数据")
            }

            // 将base64转换为二进制数据
            const imageBuffer = Buffer.from(base64Data, "base64")

            // 添加图像
            contentSection.children.push(
              new Paragraph({
                children: [
                  new ImageRun({
                    data: imageBuffer,
                    transformation: {
                      width: 600,
                      height: 400,
                    },
                  }),
                ],
                alignment: AlignmentType.CENTER,
              }),
              new Paragraph({
                text: `图 ${i + 1}: ${section.title} 页面截图`,
                style: "Caption",
              }),
              new Paragraph({
                text: "",
              }),
            )
          } else {
            console.warn(`部分 ${i + 1} 缺少有效的截图`)
            contentSection.children.push(
              new Paragraph({
                text: "[截图不可用]",
                alignment: AlignmentType.CENTER,
              }),
              new Paragraph({
                text: "",
              }),
            )
          }
        } catch (imageError) {
          console.error(`处理部分 ${i + 1} 的截图时出错:`, imageError)
          contentSection.children.push(
            new Paragraph({
              text: "[处理截图时出错]",
              alignment: AlignmentType.CENTER,
            }),
            new Paragraph({
              text: "",
            }),
          )
        }
      } catch (sectionError) {
        console.error(`处理部分 ${i + 1} 时出错:`, sectionError)
        contentSection.children.push(
          new Paragraph({
            text: `[处理部分 ${i + 1} 时出错: ${sectionError instanceof Error ? sectionError.message : String(sectionError)}]`,
            alignment: AlignmentType.CENTER,
          }),
          new Paragraph({
            text: "",
          }),
        )
      }
    }

    // 添加附录
    contentSection.children.push(
      new Paragraph({
        text: "3. 附录",
        heading: HeadingLevel.HEADING_1,
      }),
      new Paragraph({
        text: "3.1 文档信息",
        heading: HeadingLevel.HEADING_2,
      }),
    )

    // 创建文档信息表格
    const infoTable = new Table({
      width: {
        size: 100,
        type: WidthType.PERCENTAGE,
      },
      borders: {
        top: { style: BorderStyle.SINGLE, size: 1, color: "auto" },
        bottom: { style: BorderStyle.SINGLE, size: 1, color: "auto" },
        left: { style: BorderStyle.SINGLE, size: 1, color: "auto" },
        right: { style: BorderStyle.SINGLE, size: 1, color: "auto" },
        insideHorizontal: { style: BorderStyle.SINGLE, size: 1, color: "auto" },
        insideVertical: { style: BorderStyle.SINGLE, size: 1, color: "auto" },
      },
      rows: [
        new TableRow({
          children: [
            new TableCell({
              width: {
                size: 30,
                type: WidthType.PERCENTAGE,
              },
              children: [new Paragraph("文档标题")],
            }),
            new TableCell({
              width: {
                size: 70,
                type: WidthType.PERCENTAGE,
              },
              children: [new Paragraph(data.title)],
            }),
          ],
        }),
        new TableRow({
          children: [
            new TableCell({
              children: [new Paragraph("作者")],
            }),
            new TableCell({
              children: [new Paragraph(data.author)],
            }),
          ],
        }),
        new TableRow({
          children: [
            new TableCell({
              children: [new Paragraph("生成日期")],
            }),
            new TableCell({
              children: [new Paragraph(data.date)],
            }),
          ],
        }),
        new TableRow({
          children: [
            new TableCell({
              children: [new Paragraph("页面数量")],
            }),
            new TableCell({
              children: [new Paragraph(String(data.sections.length))],
            }),
          ],
        }),
      ],
    })

    contentSection.children.push(infoTable)

    // 添加内容部分到文档
    sections.push(contentSection)

    // 设置文档部分
    doc.addSection({
      children: [...sections[0].children, ...sections[1].children, ...contentSection.children],
    })

    console.log("文档生成完成，准备导出...")

    // 生成blob
    const buffer = await doc.save()
    const blob = new Blob([buffer], { type: "application/vnd.openxmlformats-officedocument.wordprocessingml.document" })

    // 创建URL
    const url = URL.createObjectURL(blob)
    console.log("文档URL已创建:", url)

    return url
  } catch (error) {
    console.error("生成Word文档时出错:", error)
    throw error
  }
}

/**
 * 将base64字符串转换为Buffer
 * @param base64 base64字符串
 * @returns Buffer
 */
function base64ToBuffer(base64: string): Buffer {
  try {
    // 移除data URL前缀
    const base64Data = base64.includes("base64,") ? base64.split("base64,")[1] : base64

    // 转换为Buffer
    return Buffer.from(base64Data, "base64")
  } catch (error) {
    console.error("base64转换为Buffer时出错:", error)
    throw error
  }
}