package v1

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

	"github.com/gorilla/mux"

	"github.com/wild-cloud/wild-central/internal/crowdsec"
)

// CrowdSecManager is the interface for CrowdSec operations used by these handlers.
type CrowdSecManager interface {
	GetStatus() (*crowdsec.Status, error)
	GetBanSummary() (*crowdsec.BanSummary, error)
	GetDecisions() ([]crowdsec.Decision, error)
	AddDecision(ip, decType, reason, duration string) error
	DeleteDecision(id int) error
	DeleteDecisionByIP(ip string) error
	GetAlerts(limit int) ([]crowdsec.Alert, error)
	GetMachines() ([]crowdsec.Machine, error)
	AddMachine(name, password string) error
	DeleteMachine(name string) error
	GetBouncers() ([]crowdsec.Bouncer, error)
	AddBouncer(name, apiKey string) error
	DeleteBouncer(name string) error
}

// crowdsecHandlers groups CrowdSec HTTP handlers with their single dependency.
type crowdsecHandlers struct {
	crowdsec CrowdSecManager
}

// CrowdSecStatus returns whether CrowdSec is running on Wild Central
// and lists registered machines and bouncers.
func (h *crowdsecHandlers) Status(w http.ResponseWriter, r *http.Request) {
	status, err := h.crowdsec.GetStatus()
	if err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to get CrowdSec status: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, status)
}

// GetSummary returns aggregated ban counts by scenario across all active decisions.
func (h *crowdsecHandlers) GetSummary(w http.ResponseWriter, r *http.Request) {
	summary, err := h.crowdsec.GetBanSummary()
	if err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to get ban summary: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, summary)
}

// GetDecisions returns active ban/captcha decisions
func (h *crowdsecHandlers) GetDecisions(w http.ResponseWriter, r *http.Request) {
	decisions, err := h.crowdsec.GetDecisions()
	if err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to get decisions: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, map[string]any{"decisions": decisions})
}

// DeleteDecision removes a ban decision by numeric ID
func (h *crowdsecHandlers) DeleteDecision(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		respondError(w, http.StatusBadRequest, "invalid decision ID")
		return
	}
	if err := h.crowdsec.DeleteDecision(id); err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to delete decision: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, map[string]string{"message": "Decision deleted"})
}

// AddDecision adds a manual ban or allow decision for an IP.
func (h *crowdsecHandlers) AddDecision(w http.ResponseWriter, r *http.Request) {
	var req struct {
		IP       string `json:"ip"`
		Type     string `json:"type"`
		Reason   string `json:"reason"`
		Duration string `json:"duration"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		respondError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if req.IP == "" {
		respondError(w, http.StatusBadRequest, "ip is required")
		return
	}
	if req.Type != "ban" && req.Type != "allow" {
		respondError(w, http.StatusBadRequest, "type must be 'ban' or 'allow'")
		return
	}
	if req.Reason == "" {
		req.Reason = "manual"
	}
	if req.Duration == "" {
		req.Duration = "24h"
	}
	if err := h.crowdsec.AddDecision(req.IP, req.Type, req.Reason, req.Duration); err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to add decision: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, map[string]string{"message": fmt.Sprintf("Decision added: %s %s for %s", req.Type, req.IP, req.Duration)})
}

// DeleteDecisionByIP removes all decisions for a specific IP address
func (h *crowdsecHandlers) DeleteDecisionByIP(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	ip := vars["ip"]
	if ip == "" {
		respondError(w, http.StatusBadRequest, "ip is required")
		return
	}
	if err := h.crowdsec.DeleteDecisionByIP(ip); err != nil {
		// cscli exits non-zero when there's nothing to delete — treat as success
		if strings.Contains(err.Error(), "no decision") || strings.Contains(err.Error(), "0 decision") {
			respondJSON(w, http.StatusOK, map[string]string{"message": "No active decision for " + ip})
			return
		}
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to delete decision: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, map[string]string{"message": "Decisions removed for " + ip})
}

// GetAlerts returns recent detection events from registered agents.
func (h *crowdsecHandlers) GetAlerts(w http.ResponseWriter, r *http.Request) {
	limit := 50
	if l := r.URL.Query().Get("limit"); l != "" {
		if n, err := strconv.Atoi(l); err == nil && n > 0 && n <= 200 {
			limit = n
		}
	}
	alerts, err := h.crowdsec.GetAlerts(limit)
	if err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to get alerts: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, map[string]any{"alerts": alerts})
}

// GetMachines returns all registered CrowdSec agent machines
func (h *crowdsecHandlers) GetMachines(w http.ResponseWriter, r *http.Request) {
	machines, err := h.crowdsec.GetMachines()
	if err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to get machines: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, map[string]any{"machines": machines})
}

// DeleteMachine removes a registered machine
func (h *crowdsecHandlers) DeleteMachine(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	name := vars["name"]
	if err := h.crowdsec.DeleteMachine(name); err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to delete machine: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, map[string]string{"message": "Machine deleted"})
}

// GetBouncers returns all registered bouncers
func (h *crowdsecHandlers) GetBouncers(w http.ResponseWriter, r *http.Request) {
	bouncers, err := h.crowdsec.GetBouncers()
	if err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to get bouncers: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, map[string]any{"bouncers": bouncers})
}

// DeleteBouncer removes a registered bouncer
func (h *crowdsecHandlers) DeleteBouncer(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	name := vars["name"]
	if err := h.crowdsec.DeleteBouncer(name); err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to delete bouncer: %v", err))
		return
	}
	respondJSON(w, http.StatusOK, map[string]string{"message": "Bouncer deleted"})
}

// AddMachine registers a new CrowdSec agent machine with pre-generated credentials.
func (h *crowdsecHandlers) AddMachine(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Name     string `json:"name"`
		Password string `json:"password"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		respondError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if req.Name == "" || req.Password == "" {
		respondError(w, http.StatusBadRequest, "name and password are required")
		return
	}
	if err := h.crowdsec.AddMachine(req.Name, req.Password); err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to add machine: %v", err))
		return
	}
	respondJSON(w, http.StatusCreated, map[string]string{"message": fmt.Sprintf("Machine %s registered", req.Name)})
}

// AddBouncer registers a new bouncer with a pre-generated API key.
func (h *crowdsecHandlers) AddBouncer(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Name   string `json:"name"`
		APIKey string `json:"apiKey"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		respondError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if req.Name == "" || req.APIKey == "" {
		respondError(w, http.StatusBadRequest, "name and apiKey are required")
		return
	}
	if err := h.crowdsec.AddBouncer(req.Name, req.APIKey); err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to add bouncer: %v", err))
		return
	}
	respondJSON(w, http.StatusCreated, map[string]string{"message": fmt.Sprintf("Bouncer %s registered", req.Name)})
}