package v1

import (
	"fmt"
	"net/http"
	"os"
	"strings"

	"github.com/wild-cloud/wild-central/internal/certbot"
	"github.com/wild-cloud/wild-central/internal/config"
	"github.com/wild-cloud/wild-central/internal/services"
)

// CertStatus returns TLS certificate status for all relevant domains:
// the central domain, the wildcard cert, and any registered service domains.
func (api *API) CertStatus(w http.ResponseWriter, r *http.Request) {
	centralDomain := api.getCentralDomain()

	globalCfg, _ := config.LoadGlobalConfig(api.getGlobalConfigPath())
	email := ""
	if globalCfg != nil {
		email = globalCfg.Operator.Email
	}

	cfToken := api.getCloudflareToken()

	// Gather cert statuses for all registered services that need TLS termination
	certs := []map[string]any{}
	seen := map[string]bool{}

	svcs, _ := api.services.List()
	for _, svc := range svcs {
		if svc.TLS != services.TLSTerminate || svc.Domain == "" {
			continue
		}
		if seen[svc.Domain] {
			continue
		}
		seen[svc.Domain] = true

		status := api.certbot.GetStatus(svc.Domain)

		entry := map[string]any{
			"domain":  svc.Domain,
			"service": svc.Domain,
			"source":  svc.Source,
			"cert":    status,
		}

		// Check if covered by a wildcard cert
		parts := strings.SplitN(svc.Domain, ".", 2)
		if len(parts) == 2 && !status.Exists {
			wildcardBase := parts[1]
			wildcardStatus := api.certbot.GetStatus(wildcardBase)
			if wildcardStatus.Exists {
				entry["coveredBy"] = "*." + wildcardBase
			}
		}

		certs = append(certs, entry)
	}

	// Include standalone certs from disk (e.g. wildcard certs) not tied to a service.
	certsDir := "/etc/haproxy/certs/"
	if entries, err := os.ReadDir(certsDir); err == nil {
		for _, e := range entries {
			if !strings.HasSuffix(e.Name(), ".pem") {
				continue
			}
			domain := strings.TrimSuffix(e.Name(), ".pem")
			if seen[domain] {
				continue
			}
			seen[domain] = true
			status := api.certbot.GetStatus(domain)
			if !status.Exists {
				// PEM file exists but openssl couldn't parse it — skip
				continue
			}
			// Use the certbot live directory to confirm this is a certbot-managed cert
			source := "standalone"
			certLive := certbot.CertPath(domain)
			if _, err := os.Stat(certLive); err == nil {
				source = "certbot"
			}
			certs = append(certs, map[string]any{
				"domain": domain,
				"source": source,
				"cert":   status,
			})
		}
	}

	respondJSON(w, http.StatusOK, map[string]any{
		"configured":   centralDomain != "",
		"domain":       centralDomain,
		"canProvision": cfToken != "" && email != "",
		"hasToken":     cfToken != "",
		"hasEmail":     email != "",
		"certs":        certs,
	})
}

// CertProvision provisions a TLS certificate for a domain using DNS-01.
// Query param ?domain=... specifies the domain. Defaults to the central domain.
func (api *API) CertProvision(w http.ResponseWriter, r *http.Request) {
	domain := r.URL.Query().Get("domain")
	if domain == "" {
		domain = api.getCentralDomain()
	}
	if domain == "" {
		respondError(w, http.StatusBadRequest, "No domain specified and no central domain configured")
		return
	}

	globalCfg, err := config.LoadGlobalConfig(api.getGlobalConfigPath())
	if err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to load config: %v", err))
		return
	}
	email := globalCfg.Operator.Email
	if email == "" {
		respondError(w, http.StatusBadRequest, "Operator email not configured")
		return
	}

	token := api.getCloudflareToken()
	if token == "" {
		respondError(w, http.StatusBadRequest, "Cloudflare API token not configured")
		return
	}

	if err := api.certbot.EnsureCredentials(token); err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Failed to write credentials: %v", err))
		return
	}

	if err := api.certbot.Provision(domain, email); err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Certificate provisioning failed: %v", err))
		return
	}

	// If this was a wildcard cert, also build HAProxy PEM
	if strings.HasPrefix(domain, "*.") {
		baseDomain := strings.TrimPrefix(domain, "*.")
		_ = api.certbot.BuildHAProxyCert(baseDomain)
	} else {
		_ = api.certbot.BuildHAProxyCert(domain)
	}

	// Trigger reconciliation so HAProxy picks up the new cert
	go api.reconcileNetworking()

	status := api.certbot.GetStatus(domain)
	respondJSON(w, http.StatusOK, map[string]any{
		"message": fmt.Sprintf("Certificate provisioned for %s", domain),
		"cert":    status,
	})
}

// CertRenew renews all certbot-managed certificates.
func (api *API) CertRenew(w http.ResponseWriter, r *http.Request) {
	if err := api.certbot.Renew(); err != nil {
		respondError(w, http.StatusInternalServerError, fmt.Sprintf("Certificate renewal failed: %v", err))
		return
	}

	// Rebuild HAProxy PEMs
	domain := api.getCentralDomain()
	if domain != "" {
		_ = api.certbot.BuildHAProxyCert(domain)
	}

	// Trigger reconciliation
	go api.reconcileNetworking()

	respondJSON(w, http.StatusOK, map[string]string{"message": "Certificates renewed"})
}

// getCentralDomain returns the configured central domain or empty string.
func (api *API) getCentralDomain() string {
	globalCfg, err := config.LoadGlobalConfig(api.getGlobalConfigPath())
	if err != nil {
		return ""
	}
	return globalCfg.Cloud.Central.Domain
}