package gateway

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

	capreg "git.yeij.top/AskaEth/Cyrene_v2/internal/capability/registry"
	apperr "git.yeij.top/AskaEth/Cyrene_v2/internal/errors"
	"git.yeij.top/AskaEth/Cyrene_v2/pkg/plugins/sdk"
)

// PluginSummary is the wire shape of a capability/plugin in the admin list.
type PluginSummary struct {
	Name            string `json:"name"`
	Kind            string `json:"kind"`
	Description     string `json:"description"`
	AllowInGroup    bool   `json:"allowInGroup"`
	AllowInStranger bool   `json:"allowInStranger"`
}

// ChannelSummary is the wire shape of a registered channel adapter.
type ChannelSummary struct {
	Name      string `json:"name"`
	Connected bool   `json:"connected"`
}

// policyRequest is the POST /api/v1/admin/plugins/policy body.
type policyRequest struct {
	Name            string `json:"name"`
	AllowInGroup    bool   `json:"allowInGroup"`
	AllowInStranger bool   `json:"allowInStranger"`
}

// adminListPersonas lists persona summaries (admin read).
func (s *Server) adminListPersonas(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, s.collectPersonas())
}

// adminListSessions lists channel sessions (admin read).
func (s *Server) adminListSessions(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, s.collectSessions(r.Context()))
}

// adminListMemories lists memory entries (admin read).
func (s *Server) adminListMemories(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, s.collectMemories(r.Context()))
}

// adminListPlugins lists every registered capability (admin read).
func (s *Server) adminListPlugins(w http.ResponseWriter, r *http.Request) {
	out := make([]PluginSummary, 0)
	if s.caps != nil {
		for _, cap := range s.caps.List("") {
			out = append(out, PluginSummary{
				Name:            cap.Name,
				Kind:            string(cap.Kind),
				Description:     cap.Description,
				AllowInGroup:    cap.Policy.AllowInGroup,
				AllowInStranger: cap.Policy.AllowInStranger,
			})
		}
	}
	writeJSON(w, http.StatusOK, out)
}

// adminListChannels lists the registered channel adapters (admin read).
func (s *Server) adminListChannels(w http.ResponseWriter, r *http.Request) {
	out := make([]ChannelSummary, 0)
	if s.caps != nil {
		for _, cap := range s.caps.List(capreg.KindChannel) {
			ch, ok := cap.Value.(sdk.Channel)
			if !ok {
				continue
			}
			out = append(out, ChannelSummary{Name: ch.Name(), Connected: ch.IsConnected()})
		}
	}
	writeJSON(w, http.StatusOK, out)
}

// adminListIoT lists IoT devices (admin read).
func (s *Server) adminListIoT(w http.ResponseWriter, r *http.Request) {
	out := make([]iotDeviceSummary, 0)
	if s.iot != nil {
		devices, err := s.iot.List(r.Context())
		if err != nil {
			s.log.Error("list iot", "err", err)
			writeError(w, apperr.Wrap(apperr.ErrInternal, "iot_failed", "failed to list devices"))
			return
		}
		for _, d := range devices {
			out = append(out, iotDeviceSummary{ID: d.ID, Name: d.Name, Type: d.Type, State: d.State, Online: d.Online})
		}
	}
	writeJSON(w, http.StatusOK, out)
}

// adminSetPolicy upserts the reachability markers for a capability. It is the
// audited admin write example (owner-only, enforced by the route registration).
func (s *Server) adminSetPolicy(w http.ResponseWriter, r *http.Request) {
	var req policyRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "invalid request body"))
		return
	}
	if req.Name == "" {
		writeError(w, apperr.Wrap(apperr.ErrBadRequest, "bad_request", "name is required"))
		return
	}
	if s.caps == nil {
		s.auditClaims(r, "policy.set", "error")
		writeError(w, apperr.Wrap(apperr.ErrInternal, "policy_unavailable", "capability service is not configured"))
		return
	}
	err := s.caps.SetPolicy(req.Name, capreg.ToolPolicy{AllowInGroup: req.AllowInGroup, AllowInStranger: req.AllowInStranger})
	if err != nil {
		s.auditClaims(r, "policy.set", "error")
		if errors.Is(err, capreg.ErrNotFound) {
			writeError(w, apperr.Wrap(apperr.ErrNotFound, "not_found", "capability %q not found", req.Name))
			return
		}
		writeError(w, apperr.Wrap(apperr.ErrInternal, "policy_failed", "failed to set policy"))
		return
	}
	s.auditClaims(r, "policy.set", "ok")
	writeJSON(w, http.StatusOK, map[string]any{"name": req.Name, "allowInGroup": req.AllowInGroup, "allowInStranger": req.AllowInStranger})
}

// collectSessions returns a non-nil session slice from the configured store.
func (s *Server) collectSessions(ctx context.Context) []SessionSummary {
	out := make([]SessionSummary, 0)
	if s.sessions == nil {
		return out
	}
	list, err := s.sessions.List(ctx)
	if err != nil {
		s.log.Error("list sessions", "err", err)
		return out
	}
	for _, sess := range list {
		out = append(out, summaryOfSession(sess))
	}
	return out
}

// collectMemories returns a non-nil memory slice from the configured store.
func (s *Server) collectMemories(ctx context.Context) []MemorySummary {
	out := make([]MemorySummary, 0)
	if s.memories == nil {
		return out
	}
	list, err := s.memories.List(ctx)
	if err != nil {
		s.log.Error("list memories", "err", err)
		return out
	}
	out = append(out, list...)
	return out
}

// iotDeviceSummary is the wire shape of an IoT device.
type iotDeviceSummary struct {
	ID     string         `json:"id"`
	Name   string         `json:"name"`
	Type   string         `json:"type"`
	State  map[string]any `json:"state"`
	Online bool           `json:"online"`
}