package cn.iocoder.yudao.module.ai.controller.admin.knowledge;

import cn.iocoder.yudao.framework.common.pojo.CommonResult;
import cn.iocoder.yudao.framework.common.pojo.PageResult;
import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
import cn.iocoder.yudao.module.ai.controller.admin.knowledge.vo.segment.*;
import cn.iocoder.yudao.module.ai.dal.dataobject.knowledge.AiKnowledgeSegmentDO;
import cn.iocoder.yudao.module.ai.service.knowledge.AiKnowledgeDocumentService;
import cn.iocoder.yudao.module.ai.service.knowledge.AiKnowledgeSegmentService;
import cn.iocoder.yudao.module.ai.service.knowledge.bo.AiKnowledgeSegmentSearchReqBO;
import cn.iocoder.yudao.module.ai.service.knowledge.bo.AiKnowledgeSegmentSearchRespBO;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.tags.Tag;
import jakarta.annotation.Resource;
import jakarta.validation.Valid;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static cn.iocoder.yudao.framework.common.pojo.CommonResult.success;

@Tag(name = "管理后台 - AI 知识库分段")
@RestController
@RequestMapping("/ai/knowledge/segment")
public class AiKnowledgeSegmentController {

    @Resource
    private AiKnowledgeSegmentService segmentService;
    @Resource
    private AiKnowledgeDocumentService documentService;

    @GetMapping("/split")
    @Operation(summary = "预览文档切分结果")
    @PreAuthorize("@ss.hasPermission('ai:knowledge:query')")
    public CommonResult<List<AiKnowledgeSegmentSplitRespVO>> previewSplit(@Valid AiKnowledgeSegmentSplitReqVO reqVO) {
        String fileUrl = reqVO.getUrl();
        if (fileUrl == null || fileUrl.isEmpty()) {
            throw new IllegalArgumentException("文档 URL 不能为空");
        }
        // 从 URL 路径中提取文件名
        String name = fileUrl;
        int queryIdx = name.indexOf('?');
        if (queryIdx > 0) name = name.substring(0, queryIdx);
        int slashIdx = name.lastIndexOf('/');
        name = slashIdx >= 0 ? name.substring(slashIdx + 1) : name;
        List<String> segments = documentService.previewSplit(fileUrl, name, reqVO.getSegmentMaxTokens());
        List<AiKnowledgeSegmentSplitRespVO> result = new ArrayList<>();
        for (String content : segments) {
            result.add(new AiKnowledgeSegmentSplitRespVO()
                    .setContent(content)
                    .setContentLength(content.length())
                    .setTokens(estimateTokens(content)));
        }
        return success(result);
    }

    private int estimateTokens(String text) {
        if (text == null || text.isEmpty()) return 0;
        int chineseChars = 0, englishWords = 0;
        for (char c : text.toCharArray()) {
            if (c >= 0x4E00 && c <= 0x9FA5) chineseChars++;
        }
        for (String word : text.split("\\s+")) {
            if (word.matches(".*[a-zA-Z].*")) englishWords++;
        }
        return chineseChars + (int) (englishWords * 1.3);
    }

    @GetMapping("/get")
    @Operation(summary = "获取分段")
    @PreAuthorize("@ss.hasPermission('ai:knowledge:query')")
    public CommonResult<AiKnowledgeSegmentRespVO> getSegment(@RequestParam("id") Long id) {
        return success(BeanUtils.toBean(segmentService.getSegment(id), AiKnowledgeSegmentRespVO.class));
    }

    @GetMapping("/page")
    @Operation(summary = "获取分段分页")
    @PreAuthorize("@ss.hasPermission('ai:knowledge:query')")
    public CommonResult<PageResult<AiKnowledgeSegmentRespVO>> getSegmentPage(@Valid AiKnowledgeSegmentPageReqVO pageReqVO) {
        PageResult<AiKnowledgeSegmentDO> pageResult = segmentService.getSegmentPage(pageReqVO);
        return success(BeanUtils.toBean(pageResult, AiKnowledgeSegmentRespVO.class));
    }

    @PostMapping("/create")
    @Operation(summary = "创建分段")
    @PreAuthorize("@ss.hasPermission('ai:knowledge:create')")
    public CommonResult<Long> createSegment(@Valid @RequestBody AiKnowledgeSegmentSaveReqVO saveReqVO) {
        return success(segmentService.createSegment(saveReqVO));
    }

    @PutMapping("/update")
    @Operation(summary = "更新分段")
    @PreAuthorize("@ss.hasPermission('ai:knowledge:update')")
    public CommonResult<Boolean> updateSegment(@Valid @RequestBody AiKnowledgeSegmentSaveReqVO saveReqVO) {
        segmentService.updateSegment(saveReqVO);
        return success(true);
    }

    @DeleteMapping("/delete")
    @Operation(summary = "删除分段")
    @PreAuthorize("@ss.hasPermission('ai:knowledge:delete')")
    public CommonResult<Boolean> deleteSegment(@RequestParam("id") Long id) {
        segmentService.deleteSegment(id);
        return success(true);
    }

    @PutMapping("/update-status")
    @Operation(summary = "更新分段状态")
    @PreAuthorize("@ss.hasPermission('ai:knowledge:update')")
    public CommonResult<Boolean> updateSegmentStatus(@Valid @RequestBody AiKnowledgeSegmentUpdateStatusReqVO updateStatusReqVO) {
        segmentService.updateSegmentStatus(updateStatusReqVO);
        return success(true);
    }

    @GetMapping("/get-process-list")
    @Operation(summary = "获取文档处理进度")
    @PreAuthorize("@ss.hasPermission('ai:knowledge:query')")
    public CommonResult<List<AiKnowledgeSegmentProcessRespVO>> getProcessList(@RequestParam("documentIds") List<Long> documentIds) {
        return success(documentService.getDocumentProcessingProgress(documentIds));
    }

    @PostMapping("/search")
    @Operation(summary = "检索分段（RAG 向量检索）")
    @PreAuthorize("@ss.hasPermission('ai:knowledge:query')")
    public CommonResult<List<AiKnowledgeSegmentSearchRespVO>> searchSegments(@Valid @RequestBody AiKnowledgeSegmentSearchReqVO searchReqVO) {
        AiKnowledgeSegmentSearchReqBO searchReqBO = BeanUtils.toBean(searchReqVO, AiKnowledgeSegmentSearchReqBO.class);
        List<AiKnowledgeSegmentSearchRespBO> results = segmentService.searchSegments(searchReqBO);
        return success(results.stream()
                .map(bo -> BeanUtils.toBean(bo, AiKnowledgeSegmentSearchRespVO.class))
                .collect(Collectors.toList()));
    }

}