package controller

import (
	"context"
	"encoding/json"
	"io"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"rag-local/common"
	"rag-local/kb/dao"
	"rag-local/kb/model/dto"
	"rag-local/kb/model/entity"
	"rag-local/kb/service"

	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
)

type contract struct{}

var Contract = &contract{}

func (c *contract) Upload(ctx context.Context, req *dto.UploadContractReq) (*dto.UploadContractRes, error) {
	if req.File == nil {
		return nil, gerror.New("请选择合同文件")
	}
	var dsIds []int64
	if req.DatasetIds != "" {
		if err := json.Unmarshal([]byte(req.DatasetIds), &dsIds); err != nil {
			return nil, gerror.New("dataset_ids 格式错误，应为 JSON 数组")
		}
	}
	if len(dsIds) == 0 {
		return nil, gerror.New("请至少选择一个法律语料数据集")
	}
	f, err := req.File.Open()
	if err != nil {
		return nil, err
	}
	defer func() { _ = f.Close() }()
	data, err := io.ReadAll(f)
	if err != nil {
		return nil, err
	}
	if len(data) == 0 {
		return nil, gerror.New("文件内容为空")
	}
	ext := strings.TrimPrefix(strings.ToLower(filepath.Ext(req.File.Filename)), ".")
	supported := false
	for _, e := range common.SupportedExts() {
		if e == ext {
			supported = true
			break
		}
	}
	if !supported {
		return nil, gerror.New("不支持的文件类型，仅支持 txt/md/pdf/docx/doc/html")
	}
	relDir := filepath.Join("contract", time.Now().Format("20060102"))
	relPath := filepath.Join(relDir, common.RandomToken(16)+"."+ext)
	absPath := filepath.Join("workspace", relPath)
	if err := os.MkdirAll(filepath.Dir(absPath), 0o755); err != nil {
		return nil, err
	}
	if err := os.WriteFile(absPath, data, 0o644); err != nil {
		return nil, err
	}
	ids := make([]string, 0, len(dsIds))
	for _, id := range dsIds {
		ids = append(ids, strconv.FormatInt(id, 10))
	}
	id, err := dao.ContractTask.Insert(ctx, req.File.Filename, relPath, strings.Join(ids, ","))
	if err != nil {
		_ = os.Remove(absPath)
		return nil, err
	}
	return &dto.UploadContractRes{Id: id}, nil
}

func (c *contract) List(ctx context.Context, req *dto.ListContractTaskReq) (*dto.ListContractTaskRes, error) {
	list, total, err := service.AnnotationService.List(ctx, req.Page, req.PageSize)
	if err != nil {
		return nil, err
	}
	return &dto.ListContractTaskRes{
		List:     list,
		Total:    total,
		Page:     req.Page,
		PageSize: req.PageSize,
	}, nil
}

func (c *contract) Detail(ctx context.Context, req *dto.GetContractDetailReq) (*dto.GetContractDetailRes, error) {
	task, err := dao.ContractTask.GetOne(ctx, req.Id)
	if err != nil {
		return nil, err
	}
	if task == nil {
		return nil, gerror.New("任务不存在")
	}
	clauses, err := dao.ContractClause.ListByTask(ctx, req.Id)
	if err != nil {
		return nil, err
	}
	marks := make(map[int64][]*entity.ContractMark)
	risks := make(map[int64][]*entity.ContractRisk)
	for _, cl := range clauses {
		list, err := dao.ContractMark.ListByClause(ctx, cl.Id)
		if err != nil {
			return nil, err
		}
		marks[cl.Id] = list
		riskList, err := dao.ContractRisk.ListByClause(ctx, cl.Id)
		if err != nil {
			return nil, err
		}
		risks[cl.Id] = riskList
	}
	return &dto.GetContractDetailRes{Task: task, Clauses: clauses, Marks: marks, Risks: risks}, nil
}

func (c *contract) Summary(ctx context.Context, req *dto.SummaryContractReq) (*dto.SummaryContractRes, error) {
	task, err := dao.ContractTask.GetOne(ctx, req.Id)
	if err != nil {
		return nil, err
	}
	if task == nil {
		return nil, gerror.New("任务不存在")
	}
	sum, err := service.AnnotationService.Summary(ctx, req.Id)
	if err != nil {
		return nil, err
	}
	return &dto.SummaryContractRes{Task: task, RiskSummary: *sum}, nil
}

func (c *contract) Annotated(ctx context.Context, req *dto.AnnotatedContractReq) (*dto.AnnotatedContractRes, error) {
	htmlStr, err := service.AnnotationService.AnnotatedHTML(ctx, req.Id)
	if err != nil {
		return nil, err
	}
	// 直接写响应体（html），中间件检测到已写入则不包装 JSON
	r := g.RequestFromCtx(ctx)
	r.Response.Header().Set("Content-Type", "text/html; charset=utf-8")
	r.Response.Write(htmlStr)
	return &dto.AnnotatedContractRes{}, nil
}

func (c *contract) Delete(ctx context.Context, req *dto.DeleteContractReq) (*dto.DeleteContractRes, error) {
	if err := service.AnnotationService.Delete(ctx, req.Id); err != nil {
		return nil, err
	}
	return &dto.DeleteContractRes{}, nil
}