package com.kaidi.oa.web;

import com.kaidi.oa.common.ApiException;
import com.kaidi.oa.common.ApiResp;
import com.kaidi.oa.domain.Archive;
import com.kaidi.oa.domain.IpKnowledge;
import com.kaidi.oa.domain.TechAchievement;
import com.kaidi.oa.domain.TechContract;
import com.kaidi.oa.repository.ArchiveRepository;
import com.kaidi.oa.repository.IpKnowledgeRepository;
import com.kaidi.oa.repository.TechAchievementRepository;
import com.kaidi.oa.repository.TechContractRepository;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

/**
 * 知识产权/研发归档中心跨类型全文检索（知识产权部，需求功能13「资料归档中心」缺口补完）。
 *
 * 补审计缺口：「无跨类型通用全文检索引擎（IpKnowledge 有关键词搜索但仅针对知识库条目，
 * 其他归档类型无统一全文检索）」：
 *  - 统一搜索接口 GET /ip-archive-search?keyword=&types=...
 *    跨 IpKnowledge（知识库）+ Archive（通用档案）+ TechAchievement（科技成果）+
 *    TechContract（技术合同）四类归档资源，在标题/名称/关键词/正文/备注字段中匹配；
 *  - 结果按类型分组返回（SearchResult 含 resourceType/resourceId/title/snippet/extra）；
 *  - types 参数可选，逗号分隔过滤类型（ip_knowledge/archive/tech_achieve/tech_contract/all）；
 *  - 目录树端点 GET /ip-archive-search/dir-tree：返回二级目录结构
 *    （一级=归档类型，二级=ipType/category/achType 等枚举值 + 该目录下的资源数量），
 *    补完「归档目录无树形层级深度（仅一层ipType，无二级目录）」缺口；
 *  - 本控制器纯只读，无写操作，默认受 AuthInterceptor 保护。
 */
@RestController
@RequestMapping("/api/oa/ip-archive-search")
public class IpArchiveSearchController {

    private final IpKnowledgeRepository knowledgeRepo;
    private final ArchiveRepository archiveRepo;
    private final TechAchievementRepository achieveRepo;
    private final TechContractRepository contractRepo;

    public IpArchiveSearchController(IpKnowledgeRepository knowledgeRepo,
                                     ArchiveRepository archiveRepo,
                                     TechAchievementRepository achieveRepo,
                                     TechContractRepository contractRepo) {
        this.knowledgeRepo = knowledgeRepo;
        this.archiveRepo = archiveRepo;
        this.achieveRepo = achieveRepo;
        this.contractRepo = contractRepo;
    }

    public record SearchResult(String resourceType, Long resourceId, String title,
                               String snippet, String extra, String status) {
    }

    public record SearchResponse(String keyword, int total, List<SearchResult> hits) {
    }

    /**
     * 跨类型全文检索：在 IpKnowledge / Archive / TechAchievement / TechContract 中
     * 按关键词匹配标题/名称/关键词/正文/备注，返回聚合结果列表。
     *
     * @param keyword 检索关键词（必填，空字符串返回 400）
     * @param types   可选，逗号分隔的类型过滤（ip_knowledge/archive/tech_achieve/tech_contract），
     *                不传或传 all 则全类型检索
     */
    @GetMapping
    public ApiResp<SearchResponse> search(@RequestParam String keyword,
                                          @RequestParam(required = false) String types) {
        String kw = keyword == null ? "" : keyword.trim();
        if (kw.isEmpty()) {
            throw new ApiException(400, "检索关键词不能为空");
        }
        boolean all = types == null || types.isBlank() || "all".equals(types.trim());
        List<String> typeList = new ArrayList<>();
        if (!all) {
            for (String t : types.split(",")) {
                String tt = t.trim();
                if (!tt.isEmpty()) typeList.add(tt);
            }
        }
        List<SearchResult> hits = new ArrayList<>();

        // --- IpKnowledge ---
        if (all || typeList.contains("ip_knowledge")) {
            for (IpKnowledge k : knowledgeRepo.findAll()) {
                if (contains(k.getTitle(), kw) || contains(k.getKeywords(), kw)
                        || contains(k.getTechField(), kw) || contains(k.getContent(), kw)) {
                    hits.add(new SearchResult("ip_knowledge", k.getId(),
                            k.getTitle(),
                            snippet(k.getContent(), kw),
                            "类型:" + k.getDocType() + " 技术分类:" + k.getTechField(),
                            null));
                }
            }
        }

        // --- Archive ---
        if (all || typeList.contains("archive")) {
            for (Archive a : archiveRepo.findAll()) {
                if (contains(a.getTitle(), kw) || contains(a.getTags(), kw)
                        || contains(a.getCategory(), kw)) {
                    hits.add(new SearchResult("archive", a.getId(),
                            a.getTitle(),
                            "分类:" + a.getCategory() + " 标签:" + a.getTags(),
                            "密级:" + a.getAccessLevel(),
                            null));
                }
            }
        }

        // --- TechAchievement ---
        if (all || typeList.contains("tech_achieve")) {
            for (TechAchievement a : achieveRepo.findAll()) {
                if (contains(a.getName(), kw) || contains(a.getAchType(), kw)
                        || contains(a.getEvalLevel(), kw) || contains(a.getEvidence(), kw)) {
                    hits.add(new SearchResult("tech_achieve", a.getId(),
                            a.getName(),
                            "成果类型:" + a.getAchType() + " 评价等级:" + a.getEvalLevel(),
                            "登记号:" + a.getRegNo(),
                            a.getStatus()));
                }
            }
        }

        // --- TechContract ---
        if (all || typeList.contains("tech_contract")) {
            for (TechContract c : contractRepo.findAll()) {
                if (contains(c.getProjectName(), kw) || contains(c.getBuyer(), kw)
                        || contains(c.getSeller(), kw) || contains(c.getTechScheme(), kw)) {
                    hits.add(new SearchResult("tech_contract", c.getId(),
                            c.getProjectName(),
                            "合同类型:" + c.getContractType() + " 买方:" + c.getBuyer(),
                            "登记号:" + c.getRegisterNo(),
                            c.getRegisterStatus()));
                }
            }
        }

        return ApiResp.ok(new SearchResponse(kw, hits.size(), hits));
    }

    // ---------- 二级目录树（归档类型 → 二级分类枚举 + 资源数）----------

    public record DirNode(String label, String type, int count, List<DirNode> children) {
    }

    public record DirTree(List<DirNode> roots) {
    }

    /**
     * 归档目录树（二级结构）：补完「归档目录无树形层级深度（仅一层ipType，无二级目录）」缺口。
     * 一级节点=归档类型（ip_knowledge/archive/tech_achieve/tech_contract）；
     * 二级节点=该类型内的分类枚举值（docType/category/achType/contractType）及该目录下资源数量。
     */
    @GetMapping("/dir-tree")
    public ApiResp<DirTree> dirTree() {
        List<DirNode> roots = new ArrayList<>();

        // ip_knowledge 目录
        java.util.Map<String, Integer> knowledgeByCat = new java.util.LinkedHashMap<>();
        for (IpKnowledge k : knowledgeRepo.findAll()) {
            String cat = k.getDocType() == null || k.getDocType().isBlank() ? "其他" : k.getDocType();
            knowledgeByCat.merge(cat, 1, Integer::sum);
        }
        List<DirNode> knowledgeChildren = new ArrayList<>();
        for (java.util.Map.Entry<String, Integer> e : knowledgeByCat.entrySet()) {
            knowledgeChildren.add(new DirNode(e.getKey(), "ip_knowledge_sub", e.getValue(), List.of()));
        }
        roots.add(new DirNode("知识产权知识库", "ip_knowledge", totalSize(knowledgeByCat), knowledgeChildren));

        // archive 目录
        java.util.Map<String, Integer> archiveByCat = new java.util.LinkedHashMap<>();
        for (Archive a : archiveRepo.findAll()) {
            String cat = a.getCategory() == null || a.getCategory().isBlank() ? "其他" : a.getCategory();
            archiveByCat.merge(cat, 1, Integer::sum);
        }
        List<DirNode> archiveChildren = new ArrayList<>();
        for (java.util.Map.Entry<String, Integer> e : archiveByCat.entrySet()) {
            archiveChildren.add(new DirNode(e.getKey(), "archive_sub", e.getValue(), List.of()));
        }
        roots.add(new DirNode("通用档案", "archive", totalSize(archiveByCat), archiveChildren));

        // tech_achieve 目录
        java.util.Map<String, Integer> achieveByCat = new java.util.LinkedHashMap<>();
        for (TechAchievement a : achieveRepo.findAll()) {
            String cat = a.getAchType() == null || a.getAchType().isBlank() ? "其他" : a.getAchType();
            achieveByCat.merge(cat, 1, Integer::sum);
        }
        List<DirNode> achieveChildren = new ArrayList<>();
        for (java.util.Map.Entry<String, Integer> e : achieveByCat.entrySet()) {
            achieveChildren.add(new DirNode(e.getKey(), "tech_achieve_sub", e.getValue(), List.of()));
        }
        roots.add(new DirNode("科技成果", "tech_achieve", totalSize(achieveByCat), achieveChildren));

        // tech_contract 目录
        java.util.Map<String, Integer> contractByCat = new java.util.LinkedHashMap<>();
        for (TechContract c : contractRepo.findAll()) {
            String cat = c.getContractType() == null || c.getContractType().isBlank() ? "其他" : c.getContractType();
            contractByCat.merge(cat, 1, Integer::sum);
        }
        List<DirNode> contractChildren = new ArrayList<>();
        for (java.util.Map.Entry<String, Integer> e : contractByCat.entrySet()) {
            contractChildren.add(new DirNode(e.getKey(), "tech_contract_sub", e.getValue(), List.of()));
        }
        roots.add(new DirNode("技术合同", "tech_contract", totalSize(contractByCat), contractChildren));

        return ApiResp.ok(new DirTree(roots));
    }

    // ---------- helpers ----------

    private boolean contains(String field, String kw) {
        return field != null && field.contains(kw);
    }

    private String snippet(String content, String kw) {
        if (content == null || kw == null) return "";
        int idx = content.indexOf(kw);
        if (idx < 0) return "";
        int start = Math.max(0, idx - 30);
        int end = Math.min(content.length(), idx + kw.length() + 60);
        return (start > 0 ? "..." : "") + content.substring(start, end) + (end < content.length() ? "..." : "");
    }

    private int totalSize(java.util.Map<String, Integer> map) {
        return map.values().stream().mapToInt(Integer::intValue).sum();
    }
}