package gateway

import (
	"encoding/json"
	"net/http"
	"strings"

	apperr "git.yeij.top/AskaEth/Cyrene_v2/internal/errors"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/knowledge"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/memory"
)

// Admin memory + knowledge-base write endpoints (owner-only, audited). The memory
// add writes a real item into the memory store (owner-private, safe), and the RAG
// index imports a document into the project index so it becomes searchable. Both
// degrade to a clear 501 when their backing store is not wired.

// memoryAddRequest is the POST /api/v1/admin/memories body.
type memoryAddRequest struct {
	PersonaID string `json:"personaId"`
	Content   string `json:"content"`
	Scope     string `json:"scope"`
}

// adminAddMemory writes a single memory item for the owner. It is the manual
// "添加记忆" path: the item is scoped to the persona (default), so it behaves like
// the "记住 X" path the loop already writes. Scope may be omitted (default
// persona) or one of user|persona|project; an invalid non-empty scope is rejected.
func (s *Server) adminAddMemory(w http.ResponseWriter, r *http.Request) {
	var req memoryAddRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "invalid request body"))
		return
	}
	personaID := strings.TrimSpace(req.PersonaID)
	if personaID == "" {
		personaID = "cyrene"
	}
	content := strings.TrimSpace(req.Content)
	if content == "" {
		s.auditClaims(r, "memory.add", "error")
		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "content is required"))
		return
	}
	rawScope := strings.TrimSpace(req.Scope)
	if rawScope != "" && !isValidMemoryScope(rawScope) {
		s.auditClaims(r, "memory.add", "error")
		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "scope must be one of user|persona|project"))
		return
	}
	store, ok := s.memories.(*memory.Store)
	if !ok {
		s.auditClaims(r, "memory.add", "error")
		writeError(w, &apperr.AppError{Code: "not_implemented", Message: "记忆存储未配置（未注入 memory.Store）", HTTPCode: http.StatusNotImplemented})
		return
	}
	stored, err := store.Add(r.Context(), memory.MemoryItem{
		PersonaID: personaID,
		Content:   content,
		Scope:     memory.Scope(rawScope),
	})
	if err != nil {
		s.auditClaims(r, "memory.add", "error")
		s.log.Error("memory add", "err", err)
		writeError(w, apperr.Wrap(apperr.ErrInternal, "memory_add_failed", "failed to add memory"))
		return
	}
	s.auditClaims(r, "memory.add", "ok")
	writeJSON(w, http.StatusCreated, map[string]any{"id": stored.ID, "scope": string(stored.Scope), "text": stored.Content})
}

// isValidMemoryScope reports whether raw is one of the defined memory scopes.
func isValidMemoryScope(raw string) bool {
	switch memory.Scope(strings.TrimSpace(raw)) {
	case memory.ScopeUser, memory.ScopePersona, memory.ScopeProject:
		return true
	default:
		return false
	}
}

// ragIndexRequest is the POST /api/v1/admin/rag body.
type ragIndexRequest struct {
	Name    string `json:"name"`
	Desc    string `json:"desc"`
	Content string `json:"content"`
}

// adminIndexRag imports one knowledge document: it hands the name/description and
// content to the knowledge store, which chunks it and indexes it into the project
// index so the document becomes keyword/searchable. It is the admin "导入文档" path.
func (s *Server) adminIndexRag(w http.ResponseWriter, r *http.Request) {
	var req ragIndexRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "invalid request body"))
		return
	}
	name := strings.TrimSpace(req.Name)
	if name == "" {
		s.auditClaims(r, "rag.index", "error")
		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "name is required"))
		return
	}
	content := strings.TrimSpace(req.Content)
	if content == "" {
		s.auditClaims(r, "rag.index", "error")
		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "content is required"))
		return
	}
	if s.rag == nil {
		s.auditClaims(r, "rag.index", "error")
		writeError(w, &apperr.AppError{Code: "not_implemented", Message: "知识库 RAG 服务未配置（未注入 RagStore）", HTTPCode: http.StatusNotImplemented})
		return
	}
	if err := s.rag.IndexDocument(r.Context(), knowledge.Doc{
		Name:    name,
		Desc:    strings.TrimSpace(req.Desc),
		Content: content,
	}); err != nil {
		s.auditClaims(r, "rag.index", "error")
		s.log.Error("rag index", "err", err)
		writeError(w, apperr.Wrap(apperr.ErrInternal, "rag_index_failed", "failed to index document"))
		return
	}
	s.auditClaims(r, "rag.index", "ok")
	writeJSON(w, http.StatusCreated, map[string]any{"name": name})
}