package handlers

import (
	"encoding/json"
	"net/http"
	"os"
	"time"
)

// SigningHandler hanterar digital signering (BankID, Scrive)
type SigningHandler struct {
	bankIDURL      string
	bankIDAPIKey   string
	scriveAPIKey   string
	docusignAPIKey string
}

func NewSigningHandler() *SigningHandler {
	return &SigningHandler{
		bankIDURL:      os.Getenv("BANKID_URL"),
		bankIDAPIKey:   os.Getenv("BANKID_API_KEY"),
		scriveAPIKey:   os.Getenv("SCRIVE_API_KEY"),
		docusignAPIKey: os.Getenv("DOCUSIGN_API_KEY"),
	}
}



// SigningRequest representerar en signeringsbegäran
type SigningRequest struct {
	ID            string     `json:"id"`
	DocumentID    string     `json:"document_id"`
	DocumentTitle string     `json:"document_title"`
	Signers       []Signer   `json:"signers"`
	Status        string     `json:"status"`
	Method        string     `json:"method"`
	CreatedAt     time.Time  `json:"created_at"`
	ExpiresAt     time.Time  `json:"expires_at"`
	SignedAt      *time.Time `json:"signed_at,omitempty"`
}

// Signer representerar en undertecknare
type Signer struct {
	ID             string     `json:"id"`
	Name           string     `json:"name"`
	Email          string     `json:"email"`
	PersonalNumber string     `json:"personal_number"`
	Signed         bool       `json:"signed"`
	SignedAt       *time.Time `json:"signed_at,omitempty"`
}

// GetMethods returnerar tillgängliga signeringsmetoder
func (h *SigningHandler) GetMethods(w http.ResponseWriter, r *http.Request) {
	methods := []map[string]interface{}{
		{
			"id":          "bankid",
			"name":        "BankID",
			"description": "Swedish electronic identification",
			"available":   h.bankIDURL != "" && h.bankIDAPIKey != "",
			"countries":   []string{"SE"},
			"setup_url":   "https://www.bankid.com/foretag",
		},
		{
			"id":          "scrive",
			"name":        "Scrive",
			"description": "Electronic signature platform",
			"available":   h.scriveAPIKey != "",
			"setup_url":   "https://scrive.com",
		},
		{
			"id":          "docusign",
			"name":        "DocuSign",
			"description": "Global e-signature solution",
			"available":   h.docusignAPIKey != "",
			"setup_url":   "https://docusign.com",
		},
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"ok":      true,
		"methods": methods,
	})
}

// GetRequests returnerar signeringsbegäranden
func (h *SigningHandler) GetRequests(w http.ResponseWriter, r *http.Request) {
	// TODO: Implementera DB-lagring av signeringsbegäranden
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusNotImplemented)
	json.NewEncoder(w).Encode(map[string]interface{}{
		"ok":    false,
		"error": "Signing requests not yet implemented. Configure BANKID_URL and BANKID_API_KEY to enable.",
	})
}

// InitiateBankID initierar BankID-signering
func (h *SigningHandler) InitiateBankID(w http.ResponseWriter, r *http.Request) {
	if h.bankIDURL == "" || h.bankIDAPIKey == "" {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusServiceUnavailable)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"ok":    false,
			"error": "BankID not configured. Set BANKID_URL and BANKID_API_KEY environment variables.",
		})
		return
	}

	var req struct {
		PersonalNumber string `json:"personal_number"`
		DocumentID     string `json:"document_id"`
	}

	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	// TODO: Implementera riktig BankID API-integration
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusNotImplemented)
	json.NewEncoder(w).Encode(map[string]interface{}{
		"ok":    false,
		"error": "BankID integration not yet implemented. Contact administrator to configure.",
	})
}