package httpapi

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"io"
	"knowledge-governance/internal/qaopsorg"
	"net/http"
)

type QAOrgStore interface {
	GetView(context.Context) (qaopsorg.State, error)
	PreviewRules(context.Context, qaopsorg.SaveRequest) (qaopsorg.State, error)
	SaveRules(context.Context, qaopsorg.SaveRequest, string) (qaopsorg.State, error)
}

func qaOrganization(w http.ResponseWriter, r *http.Request, config Config) {
	if !authorizeQAOps(w, r) {
		return
	}
	if r.URL.RawQuery != "" {
		writeOrgError(w, qaopsorg.ErrInvalid)
		return
	}
	if config.QAOrg == nil {
		writeOrgError(w, qaopsorg.ErrUnavailable)
		return
	}
	var result qaopsorg.State
	var err error
	if r.Method == http.MethodGet {
		result, err = config.QAOrg.GetView(r.Context())
	} else {
		if !authorizeQAOrganizationWrite(w, r) {
			return
		}
		var request qaopsorg.SaveRequest
		raw, readErr := io.ReadAll(http.MaxBytesReader(w, r.Body, 1<<20))
		check := json.NewDecoder(bytes.NewReader(raw))
		var fields map[string]json.RawMessage
		var extra any
		invalidJSON := readErr != nil || json.Unmarshal(raw, &fields) != nil || fields == nil || fields["base_revision"] == nil || walkQualityJSON(check) != nil || check.Decode(&extra) != io.EOF
		decoder := json.NewDecoder(bytes.NewReader(raw))
		decoder.DisallowUnknownFields()
		if invalidJSON || decoder.Decode(&request) != nil || decoder.Decode(&extra) != io.EOF || request.DirectoryID == "" || request.Rules == nil {
			writeOrgError(w, qaopsorg.ErrInvalid)
			return
		}
		if r.Method == http.MethodPost {
			result, err = config.QAOrg.PreviewRules(r.Context(), request)
		} else {
			identity, _ := sessionFrom(r.Context())
			result, err = config.QAOrg.SaveRules(r.Context(), request, identity.Username)
		}
	}
	if err != nil {
		writeOrgError(w, err)
		return
	}
	writeJSON(w, 200, map[string]any{"data": result})
}
func writeOrgError(w http.ResponseWriter, err error) {
	status, message := 503, "通讯录或区域配置存储不可用，未展示为空数据"
	switch {
	case errors.Is(err, qaopsorg.ErrInvalid):
		status, message = 400, "部门树或区域配置无效，请核对重复、缺失路径及区域"
	case errors.Is(err, qaopsorg.ErrConflict):
		status, message = 409, "通讯录或区域配置已变化，请重新读取后预览"
	case errors.Is(err, qaopsorg.ErrNoDirectory):
		status, message = 409, "尚无完整通讯录快照，不能保存区域配置"
	}
	writeJSON(w, status, map[string]string{"error": message})
}