package com.mydreamjob.onlineresume;

import org.springframework.stereotype.Component;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.util.*;
import java.util.zip.*;

/** 生成真正的 OOXML 文档；用户文本只作为文字写入，无外链、宏或文件读取。 */
@Component
public class OnlineResumeDocxWriter {
    public byte[] write(OnlineResumeContent c) {
        List<String> lines = new ArrayList<>();
        var b = c.getBasicInfo();
        lines.add(b.getRealName() == null || b.getRealName().isBlank() ? "个人简历" : b.getRealName() + "的简历");
        lines.add(join(b.getPhone(), b.getEmail(), b.getLocation()));
        lines.add(join(b.getEducation(), b.getSchool(), b.getGraduationYear()));
        var j = c.getJobIntention();
        lines.add("求职意向"); lines.add(join(j.getTargetPosition(), String.join("、", j.getPreferredCities())));
        if (j.getExpectedSalaryMin() != null || j.getExpectedSalaryMax() != null)
            lines.add("期望月薪（元）：" + Objects.toString(j.getExpectedSalaryMin(), "不限") + "—" + Objects.toString(j.getExpectedSalaryMax(), "不限"));
        lines.add(join(String.join("、", j.getEmploymentTypes()), String.join("、", j.getPreferredIndustries()), String.join("、", j.getPreferredJobTypes())));
        if (j.getJobSeekingStatus() != null) lines.add("求职状态：" + switch (j.getJobSeekingStatus()) {
            case LOOKING -> "正在求职"; case OPEN_TO_OPPORTUNITIES -> "考虑机会";
            case NOT_LOOKING -> "暂不求职"; case STUDENT -> "在校学生";
        });
        if (j.getAvailableFrom() != null) lines.add("可到岗日期：" + j.getAvailableFrom());
        if (j.getEmploymentStatus() != null) lines.add("当前状态：" + switch (j.getEmploymentStatus()) {
            case EMPLOYED -> "在职"; case UNEMPLOYED -> "离职/未就业"; case STUDENT -> "在校";
        });
        if (j.isRemoteAllowed()) lines.add("接受远程工作");
        lines.add("教育经历");
        for (var e : c.getEducationExperiences()) { lines.add(join(e.getSchool(), e.getMajor(), e.getDegree(), dates(e))); lines.add(e.getDescription()); }
        lines.add("工作经历");
        for (var e : c.getWorkExperiences()) {
            String type = "INTERNSHIP".equals(e.getExperienceType()) ? "实习"
                    : "FULL_TIME".equals(e.getExperienceType()) ? "正式工作" : "类型未区分";
            lines.add(join(e.getCompany(), e.getPosition(), type, dates(e))); lines.add(e.getDescription());
        }
        lines.add("项目经历");
        for (var e : c.getProjectExperiences()) { lines.add(join(e.getName(), e.getRole(), dates(e))); lines.add(e.getDescription()); }
        lines.add("技能特长");
        for (var e : c.getSkills()) {
            String level = e.getLevel() == null ? null : switch (e.getLevel()) {
                case BEGINNER -> "入门"; case FAMILIAR -> "熟悉"; case PROFICIENT -> "熟练"; case EXPERT -> "精通";
            };
            lines.add(join(e.getName(), level, e.getYears() == null ? null : e.getYears() + "年")); lines.add(e.getDescription());
        }
        lines.add("自我评价"); lines.add(c.getSelfEvaluation());
        StringBuilder body = new StringBuilder();
        for (String text : lines) {
            if (text == null || text.isBlank()) continue;
            for (String line : text.split("\\R", -1)) body.append("<w:p><w:pPr><w:spacing w:after=\"120\"/></w:pPr><w:r><w:rPr><w:rFonts w:ascii=\"Calibri\" w:eastAsia=\"Microsoft YaHei\"/><w:sz w:val=\"22\"/></w:rPr><w:t xml:space=\"preserve\">")
                    .append(xml(line)).append("</w:t></w:r></w:p>");
        }
        body.append("<w:sectPr><w:pgSz w:w=\"11906\" w:h=\"16838\"/><w:pgMar w:top=\"1134\" w:right=\"1134\" w:bottom=\"1134\" w:left=\"1134\"/></w:sectPr>");
        try (var out = new ByteArrayOutputStream(); var zip = new ZipOutputStream(out, StandardCharsets.UTF_8)) {
            add(zip, "[Content_Types].xml", "<?xml version=\"1.0\" encoding=\"UTF-8\"?><Types xmlns=\"http://schemas.openxmlformats.org/package/2006/content-types\"><Default Extension=\"rels\" ContentType=\"application/vnd.openxmlformats-package.relationships+xml\"/><Default Extension=\"xml\" ContentType=\"application/xml\"/><Override PartName=\"/word/document.xml\" ContentType=\"application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml\"/></Types>");
            add(zip, "_rels/.rels", "<?xml version=\"1.0\" encoding=\"UTF-8\"?><Relationships xmlns=\"http://schemas.openxmlformats.org/package/2006/relationships\"><Relationship Id=\"rId1\" Type=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument\" Target=\"word/document.xml\"/></Relationships>");
            add(zip, "word/document.xml", "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body>" + body + "</w:body></w:document>");
            zip.finish(); return out.toByteArray();
        } catch (IOException e) { throw new IllegalStateException("cannot generate resume document", e); }
    }
    private String dates(OnlineResumeContent.DatedEntry e) { return Objects.toString(e.getStartDate(), "") + "—" + (e.isOngoing() ? "至今" : Objects.toString(e.getEndDate(), "")); }
    private String join(Object... fields) { return Arrays.stream(fields).filter(Objects::nonNull).map(Object::toString).filter(s -> !s.isBlank()).collect(java.util.stream.Collectors.joining(" · ")); }
    private String xml(String s) {
        StringBuilder clean = new StringBuilder();
        s.codePoints().filter(c -> c == 9 || c == 10 || c == 13 || c >= 32 && c <= 0xd7ff || c >= 0xe000 && c <= 0xfffd || c >= 0x10000 && c <= 0x10ffff).forEach(clean::appendCodePoint);
        return clean.toString().replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;").replace("\"", "&quot;").replace("'", "&apos;");
    }
    private void add(ZipOutputStream zip, String name, String text) throws IOException {
        zip.putNextEntry(new ZipEntry(name)); zip.write(text.getBytes(StandardCharsets.UTF_8)); zip.closeEntry();
    }
}