package httpapi

import (
	"net/http"
	"strconv"

	"cloudipvalidator/internal/db"
)

// --- validators ---

func (s *Server) handleConfigListValidators(w http.ResponseWriter, r *http.Request) {
	validators, err := s.DB.ListValidators(r.Context())
	if err != nil {
		writeDBError(w, err)
		return
	}
	out := make([]validatorDTO, len(validators))
	for i, v := range validators {
		out[i] = validatorDTO{
			ValidatorID: v.ValidatorID, Hostname: v.Hostname, OSPortID: v.OSPortID,
			State: v.State, LastHeartbeatAt: v.LastHeartbeatAt,
		}
	}
	writeJSON(w, http.StatusOK, out)
}

func (s *Server) handleConfigCreateValidator(w http.ResponseWriter, r *http.Request) {
	var req createValidatorRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if req.ValidatorID == "" {
		writeError(w, http.StatusBadRequest, "validator_id must not be empty")
		return
	}
	if err := s.DB.AdminCreateValidator(r.Context(), req.ValidatorID, req.OSPortID); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusCreated, validatorDTO{ValidatorID: req.ValidatorID, OSPortID: req.OSPortID, State: "idle"})
}

func (s *Server) handleConfigUpdateValidator(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req updateValidatorRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if err := s.DB.AdminUpdateValidatorPort(r.Context(), id, req.OSPortID); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

func (s *Server) handleConfigDeleteValidator(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.DB.DeleteValidator(r.Context(), id); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

// --- sites ---

func (s *Server) handleConfigListSites(w http.ResponseWriter, r *http.Request) {
	sites, err := s.DB.ListSites(r.Context())
	if err != nil {
		writeDBError(w, err)
		return
	}
	out := make([]siteDTO, len(sites))
	for i, site := range sites {
		out[i] = siteDTO{
			Index: site.Index, SiteID: site.SiteID, Hostname: site.Hostname,
			State: site.State, LastHeartbeatAt: site.LastHeartbeatAt,
		}
	}
	writeJSON(w, http.StatusOK, out)
}

func (s *Server) handleConfigPutSite(w http.ResponseWriter, r *http.Request) {
	idx, err := strconv.Atoi(r.PathValue("index"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "index must be an integer")
		return
	}
	var req putSiteRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if err := s.DB.UpsertSite(r.Context(), idx, req.SiteID); err != nil {
		writeDBError(w, err)
		return
	}
	// UpsertSite always resets hostname/state/last_heartbeat_at to their
	// "never connected" defaults on write (see its doc comment).
	writeJSON(w, http.StatusOK, siteDTO{Index: idx, SiteID: req.SiteID, State: db.SiteUnregistered})
}

func (s *Server) handleConfigDeleteSite(w http.ResponseWriter, r *http.Request) {
	idx, err := strconv.Atoi(r.PathValue("index"))
	if err != nil {
		writeError(w, http.StatusBadRequest, "index must be an integer")
		return
	}
	if err := s.DB.DeleteSite(r.Context(), idx); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

// --- target groups ---

func (s *Server) handleConfigListTargets(w http.ResponseWriter, r *http.Request) {
	groups, err := s.DB.ListTargetGroups(r.Context())
	if err != nil {
		writeDBError(w, err)
		return
	}
	out := make([]targetGroupDTO, len(groups))
	for i, g := range groups {
		out[i] = targetGroupDTO{Name: g.Name, Targets: g.Targets}
	}
	writeJSON(w, http.StatusOK, out)
}

func (s *Server) handleConfigPutTargetGroup(w http.ResponseWriter, r *http.Request) {
	name := r.PathValue("group")
	var req putTargetGroupRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if err := s.DB.UpsertTargetGroup(r.Context(), name, req.Targets); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, targetGroupDTO{Name: name, Targets: req.Targets})
}

func (s *Server) handleConfigDeleteTargetGroup(w http.ResponseWriter, r *http.Request) {
	name := r.PathValue("group")
	if err := s.DB.DeleteTargetGroup(r.Context(), name); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

// --- check types ---

func (s *Server) handleConfigListCheckTypes(w http.ResponseWriter, r *http.Request) {
	checkTypes, err := s.DB.ListCheckTypes(r.Context())
	if err != nil {
		writeDBError(w, err)
		return
	}
	out := make([]checkTypeDTO, len(checkTypes))
	for i, ct := range checkTypes {
		out[i] = checkTypeDTO{Name: ct.Name, Enabled: ct.Enabled, Targets: ct.TargetGroups}
	}
	writeJSON(w, http.StatusOK, out)
}

func (s *Server) handleConfigPutCheckType(w http.ResponseWriter, r *http.Request) {
	name := r.PathValue("name")
	var req putCheckTypeRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if err := s.DB.UpsertCheckType(r.Context(), name, req.Enabled, req.Targets); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, checkTypeDTO{Name: name, Enabled: req.Enabled, Targets: req.Targets})
}

func (s *Server) handleConfigDeleteCheckType(w http.ResponseWriter, r *http.Request) {
	name := r.PathValue("name")
	if err := s.DB.DeleteCheckType(r.Context(), name); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

// --- orchestrator settings ---

func (s *Server) handleConfigGetOrchestratorSettings(w http.ResponseWriter, r *http.Request) {
	settings, err := s.DB.GetSettings(r.Context())
	if err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, orchestratorSettingsDTO{
		FIPSettleSeconds:       settings.FIPSettleSeconds,
		HistoryRetentionCycles: settings.HistoryRetentionCycles,
	})
}

// handleConfigPutOrchestratorSettings goes through the orchestrator (not a
// direct DB call, unlike the read above) because setting fip_settle_seconds
// needs cross-field validation against the static lease_ttl_seconds/
// self_check_timeout_seconds config, which only the orchestrator has.
func (s *Server) handleConfigPutOrchestratorSettings(w http.ResponseWriter, r *http.Request) {
	var req orchestratorSettingsDTO
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if err := s.Orch.SetFIPSettleSeconds(r.Context(), req.FIPSettleSeconds); err != nil {
		writeDBError(w, err)
		return
	}
	if err := s.DB.SetHistoryRetentionCycles(r.Context(), req.HistoryRetentionCycles); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, orchestratorSettingsDTO{
		FIPSettleSeconds:       req.FIPSettleSeconds,
		HistoryRetentionCycles: req.HistoryRetentionCycles,
	})
}

// --- prober inbound checks ---

func (s *Server) handleConfigGetInboundChecks(w http.ResponseWriter, r *http.Request) {
	settings, err := s.DB.GetInboundChecks(r.Context())
	if err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, inboundChecksDTO{Ports: settings.Ports, ICMP: settings.ICMP})
}

// handleConfigPutInboundChecks writes directly to the DB (unlike the
// orchestrator-settings PUT above) because port-range/duplicate validation
// is purely local — no cross-field dependency on other orchestrator config.
func (s *Server) handleConfigPutInboundChecks(w http.ResponseWriter, r *http.Request) {
	var req inboundChecksDTO
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if err := s.DB.SetInboundChecks(r.Context(), req.Ports, req.ICMP); err != nil {
		writeDBError(w, err)
		return
	}
	writeJSON(w, http.StatusOK, inboundChecksDTO{Ports: req.Ports, ICMP: req.ICMP})
}