package router

import (
	"net/http"

	"github.com/shankar0123/certctl/internal/api/handler"
	"github.com/shankar0123/certctl/internal/api/middleware"
)

// Router wraps http.ServeMux and manages route registration with middleware.
type Router struct {
	mux        *http.ServeMux
	middleware []func(http.Handler) http.Handler
}

// New creates a new Router instance.
func New() *Router {
	return &Router{
		mux:        http.NewServeMux(),
		middleware: []func(http.Handler) http.Handler{},
	}
}

// NewWithMiddleware creates a Router with initial middleware stack.
func NewWithMiddleware(middlewares ...func(http.Handler) http.Handler) *Router {
	r := New()
	r.middleware = middlewares
	return r
}

// ServeHTTP implements http.Handler interface.
func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	r.mux.ServeHTTP(w, req)
}

// Register registers a handler for a given path with the middleware chain applied.
func (r *Router) Register(pattern string, handler http.Handler) {
	r.mux.Handle(pattern, middleware.Chain(handler, r.middleware...))
}

// RegisterFunc registers a handler function for a given path.
func (r *Router) RegisterFunc(pattern string, handler func(http.ResponseWriter, *http.Request)) {
	r.Register(pattern, http.HandlerFunc(handler))
}

// RegisterHandlers sets up all API routes with their handlers.
func (r *Router) RegisterHandlers(
	certificates handler.CertificateHandler,
	issuers handler.IssuerHandler,
	targets handler.TargetHandler,
	agents handler.AgentHandler,
	jobs handler.JobHandler,
	policies handler.PolicyHandler,
	profiles handler.ProfileHandler,
	teams handler.TeamHandler,
	owners handler.OwnerHandler,
	agentGroups handler.AgentGroupHandler,
	audit handler.AuditHandler,
	notifications handler.NotificationHandler,
	health handler.HealthHandler,
) {
	// Health endpoints (no auth middleware — must always be accessible)
	r.mux.Handle("GET /health", middleware.Chain(
		http.HandlerFunc(health.Health),
		middleware.CORS,
		middleware.ContentType,
	))
	r.mux.Handle("GET /ready", middleware.Chain(
		http.HandlerFunc(health.Ready),
		middleware.CORS,
		middleware.ContentType,
	))
	// Auth info endpoint (no auth middleware — GUI needs this before login)
	r.mux.Handle("GET /api/v1/auth/info", middleware.Chain(
		http.HandlerFunc(health.AuthInfo),
		middleware.CORS,
		middleware.ContentType,
	))
	// Auth check endpoint (uses full middleware chain via r.Register)
	r.Register("GET /api/v1/auth/check", http.HandlerFunc(health.AuthCheck))

	// Certificates routes: /api/v1/certificates
	r.Register("GET /api/v1/certificates", http.HandlerFunc(certificates.ListCertificates))
	r.Register("POST /api/v1/certificates", http.HandlerFunc(certificates.CreateCertificate))
	r.Register("GET /api/v1/certificates/{id}", http.HandlerFunc(certificates.GetCertificate))
	r.Register("PUT /api/v1/certificates/{id}", http.HandlerFunc(certificates.UpdateCertificate))
	r.Register("DELETE /api/v1/certificates/{id}", http.HandlerFunc(certificates.ArchiveCertificate))
	r.Register("GET /api/v1/certificates/{id}/versions", http.HandlerFunc(certificates.GetCertificateVersions))
	r.Register("POST /api/v1/certificates/{id}/renew", http.HandlerFunc(certificates.TriggerRenewal))
	r.Register("POST /api/v1/certificates/{id}/deploy", http.HandlerFunc(certificates.TriggerDeployment))

	// Issuers routes: /api/v1/issuers
	r.Register("GET /api/v1/issuers", http.HandlerFunc(issuers.ListIssuers))
	r.Register("POST /api/v1/issuers", http.HandlerFunc(issuers.CreateIssuer))
	r.Register("GET /api/v1/issuers/{id}", http.HandlerFunc(issuers.GetIssuer))
	r.Register("PUT /api/v1/issuers/{id}", http.HandlerFunc(issuers.UpdateIssuer))
	r.Register("DELETE /api/v1/issuers/{id}", http.HandlerFunc(issuers.DeleteIssuer))
	r.Register("POST /api/v1/issuers/{id}/test", http.HandlerFunc(issuers.TestConnection))

	// Targets routes: /api/v1/targets
	r.Register("GET /api/v1/targets", http.HandlerFunc(targets.ListTargets))
	r.Register("POST /api/v1/targets", http.HandlerFunc(targets.CreateTarget))
	r.Register("GET /api/v1/targets/{id}", http.HandlerFunc(targets.GetTarget))
	r.Register("PUT /api/v1/targets/{id}", http.HandlerFunc(targets.UpdateTarget))
	r.Register("DELETE /api/v1/targets/{id}", http.HandlerFunc(targets.DeleteTarget))

	// Agents routes: /api/v1/agents
	r.Register("GET /api/v1/agents", http.HandlerFunc(agents.ListAgents))
	r.Register("POST /api/v1/agents", http.HandlerFunc(agents.RegisterAgent))
	r.Register("GET /api/v1/agents/{id}", http.HandlerFunc(agents.GetAgent))
	r.Register("POST /api/v1/agents/{id}/heartbeat", http.HandlerFunc(agents.Heartbeat))
	r.Register("POST /api/v1/agents/{id}/csr", http.HandlerFunc(agents.AgentCSRSubmit))
	r.Register("GET /api/v1/agents/{id}/certificates/{cert_id}", http.HandlerFunc(agents.AgentCertificatePickup))
	r.Register("GET /api/v1/agents/{id}/work", http.HandlerFunc(agents.AgentGetWork))
	r.Register("POST /api/v1/agents/{id}/jobs/{job_id}/status", http.HandlerFunc(agents.AgentReportJobStatus))

	// Jobs routes: /api/v1/jobs
	r.Register("GET /api/v1/jobs", http.HandlerFunc(jobs.ListJobs))
	r.Register("GET /api/v1/jobs/{id}", http.HandlerFunc(jobs.GetJob))
	r.Register("POST /api/v1/jobs/{id}/cancel", http.HandlerFunc(jobs.CancelJob))
	r.Register("POST /api/v1/jobs/{id}/approve", http.HandlerFunc(jobs.ApproveJob))
	r.Register("POST /api/v1/jobs/{id}/reject", http.HandlerFunc(jobs.RejectJob))

	// Policies routes: /api/v1/policies
	r.Register("GET /api/v1/policies", http.HandlerFunc(policies.ListPolicies))
	r.Register("POST /api/v1/policies", http.HandlerFunc(policies.CreatePolicy))
	r.Register("GET /api/v1/policies/{id}", http.HandlerFunc(policies.GetPolicy))
	r.Register("PUT /api/v1/policies/{id}", http.HandlerFunc(policies.UpdatePolicy))
	r.Register("DELETE /api/v1/policies/{id}", http.HandlerFunc(policies.DeletePolicy))
	r.Register("GET /api/v1/policies/{id}/violations", http.HandlerFunc(policies.ListViolations))

	// Profiles routes: /api/v1/profiles
	r.Register("GET /api/v1/profiles", http.HandlerFunc(profiles.ListProfiles))
	r.Register("POST /api/v1/profiles", http.HandlerFunc(profiles.CreateProfile))
	r.Register("GET /api/v1/profiles/{id}", http.HandlerFunc(profiles.GetProfile))
	r.Register("PUT /api/v1/profiles/{id}", http.HandlerFunc(profiles.UpdateProfile))
	r.Register("DELETE /api/v1/profiles/{id}", http.HandlerFunc(profiles.DeleteProfile))

	// Teams routes: /api/v1/teams
	r.Register("GET /api/v1/teams", http.HandlerFunc(teams.ListTeams))
	r.Register("POST /api/v1/teams", http.HandlerFunc(teams.CreateTeam))
	r.Register("GET /api/v1/teams/{id}", http.HandlerFunc(teams.GetTeam))
	r.Register("PUT /api/v1/teams/{id}", http.HandlerFunc(teams.UpdateTeam))
	r.Register("DELETE /api/v1/teams/{id}", http.HandlerFunc(teams.DeleteTeam))

	// Owners routes: /api/v1/owners
	r.Register("GET /api/v1/owners", http.HandlerFunc(owners.ListOwners))
	r.Register("POST /api/v1/owners", http.HandlerFunc(owners.CreateOwner))
	r.Register("GET /api/v1/owners/{id}", http.HandlerFunc(owners.GetOwner))
	r.Register("PUT /api/v1/owners/{id}", http.HandlerFunc(owners.UpdateOwner))
	r.Register("DELETE /api/v1/owners/{id}", http.HandlerFunc(owners.DeleteOwner))

	// Agent Groups routes: /api/v1/agent-groups
	r.Register("GET /api/v1/agent-groups", http.HandlerFunc(agentGroups.ListAgentGroups))
	r.Register("POST /api/v1/agent-groups", http.HandlerFunc(agentGroups.CreateAgentGroup))
	r.Register("GET /api/v1/agent-groups/{id}", http.HandlerFunc(agentGroups.GetAgentGroup))
	r.Register("PUT /api/v1/agent-groups/{id}", http.HandlerFunc(agentGroups.UpdateAgentGroup))
	r.Register("DELETE /api/v1/agent-groups/{id}", http.HandlerFunc(agentGroups.DeleteAgentGroup))
	r.Register("GET /api/v1/agent-groups/{id}/members", http.HandlerFunc(agentGroups.ListAgentGroupMembers))

	// Audit routes: /api/v1/audit
	r.Register("GET /api/v1/audit", http.HandlerFunc(audit.ListAuditEvents))
	r.Register("GET /api/v1/audit/{id}", http.HandlerFunc(audit.GetAuditEvent))

	// Notifications routes: /api/v1/notifications
	r.Register("GET /api/v1/notifications", http.HandlerFunc(notifications.ListNotifications))
	r.Register("GET /api/v1/notifications/{id}", http.HandlerFunc(notifications.GetNotification))
	r.Register("POST /api/v1/notifications/{id}/read", http.HandlerFunc(notifications.MarkAsRead))
}

// GetMux returns the underlying http.ServeMux for direct access if needed.
func (r *Router) GetMux() *http.ServeMux {
	return r.mux
}