package api

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

	"github.com/agentsphere/agent-mgr/internal/store"
	"github.com/go-chi/chi/v5"
	"github.com/google/uuid"
)

type createSessionRequest struct {
	Prompt   string          `json:"prompt"`
	Provider string          `json:"provider,omitempty"`
	Config   json.RawMessage `json:"config,omitempty"`
}

type sendMessageRequest struct {
	Message string `json:"message"`
}

func (s *Server) createSession(w http.ResponseWriter, r *http.Request) {
	appID, err := uuid.Parse(chi.URLParam(r, "appID"))
	if err != nil {
		http.Error(w, `{"error":"invalid app id"}`, http.StatusBadRequest)
		return
	}

	var req createSessionRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, `{"error":"invalid request body"}`, http.StatusBadRequest)
		return
	}
	if req.Prompt == "" {
		http.Error(w, `{"error":"prompt required"}`, http.StatusBadRequest)
		return
	}

	app, err := s.store.GetApp(r.Context(), appID)
	if err != nil || app == nil {
		http.Error(w, `{"error":"app not found"}`, http.StatusNotFound)
		return
	}

	sess, err := s.app.StartSession(r.Context(), app, req.Prompt, req.Provider, req.Config)
	if err != nil {
		s.log.Error("create session failed", "err", err)
		http.Error(w, `{"error":"failed to create session"}`, http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(map[string]any{"session": sess})
}

func (s *Server) listSessions(w http.ResponseWriter, r *http.Request) {
	appID, err := uuid.Parse(chi.URLParam(r, "appID"))
	if err != nil {
		http.Error(w, `{"error":"invalid app id"}`, http.StatusBadRequest)
		return
	}

	sessions, err := s.store.ListSessionsByApp(r.Context(), appID)
	if err != nil {
		http.Error(w, `{"error":"failed to list sessions"}`, http.StatusInternalServerError)
		return
	}
	if sessions == nil {
		sessions = []store.Session{}
	}

	json.NewEncoder(w).Encode(map[string]any{"sessions": sessions})
}

func (s *Server) getSession(w http.ResponseWriter, r *http.Request) {
	id, err := uuid.Parse(chi.URLParam(r, "sessionID"))
	if err != nil {
		http.Error(w, `{"error":"invalid session id"}`, http.StatusBadRequest)
		return
	}

	sess, err := s.store.GetSession(r.Context(), id)
	if err != nil || sess == nil {
		http.Error(w, `{"error":"session not found"}`, http.StatusNotFound)
		return
	}

	json.NewEncoder(w).Encode(map[string]any{"session": sess})
}

func (s *Server) stopSession(w http.ResponseWriter, r *http.Request) {
	id, err := uuid.Parse(chi.URLParam(r, "sessionID"))
	if err != nil {
		http.Error(w, `{"error":"invalid session id"}`, http.StatusBadRequest)
		return
	}

	if err := s.app.StopSession(r.Context(), id); err != nil {
		s.log.Error("stop session failed", "err", err)
		http.Error(w, `{"error":"failed to stop session"}`, http.StatusInternalServerError)
		return
	}

	json.NewEncoder(w).Encode(map[string]any{"status": "stopped"})
}

func (s *Server) sendMessage(w http.ResponseWriter, r *http.Request) {
	id, err := uuid.Parse(chi.URLParam(r, "sessionID"))
	if err != nil {
		http.Error(w, `{"error":"invalid session id"}`, http.StatusBadRequest)
		return
	}

	var req sendMessageRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, `{"error":"invalid request body"}`, http.StatusBadRequest)
		return
	}
	if req.Message == "" {
		http.Error(w, `{"error":"message required"}`, http.StatusBadRequest)
		return
	}

	if err := s.app.SendMessage(r.Context(), id, req.Message); err != nil {
		s.log.Error("send message failed", "err", err)
		http.Error(w, `{"error":"failed to send message"}`, http.StatusInternalServerError)
		return
	}

	json.NewEncoder(w).Encode(map[string]any{"status": "sent"})
}

func (s *Server) listProviders(w http.ResponseWriter, r *http.Request) {
	infos := s.registry.List()
	json.NewEncoder(w).Encode(map[string]any{"providers": infos})
}