package handler

import (
	"strconv"

	"github.com/gofiber/fiber/v2"

	"github.com/gosec/gsc-ops-api/internal/middleware"
	"github.com/gosec/gsc-ops-api/internal/service"
	"github.com/gosec/gsc-ops-api/pkg/types"
)

// CardDAVHandler handles CardDAV endpoints
type CardDAVHandler struct {
	svc *service.CardDAVService
}

// NewCardDAVHandler creates a new CardDAV handler
func NewCardDAVHandler(svc *service.CardDAVService) *CardDAVHandler {
	return &CardDAVHandler{svc: svc}
}

// --- Principals ---

// ListPrincipals handles GET /api/v1/carddav/principals
func (h *CardDAVHandler) ListPrincipals(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	principals, err := h.svc.ListPrincipals(c.Context())
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(principals, reqID))
}

// GetPrincipal handles GET /api/v1/carddav/principals/:username
func (h *CardDAVHandler) GetPrincipal(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)
	username := c.Params("username")

	principal, err := h.svc.GetPrincipal(c.Context(), username)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}
	if principal == nil {
		apiErr := types.NewNotFound("Principal not found")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(principal, reqID))
}

// CreatePrincipal handles POST /api/v1/carddav/principals
func (h *CardDAVHandler) CreatePrincipal(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	var req types.CardDAVPrincipalCreate
	if err := c.BodyParser(&req); err != nil {
		apiErr := types.NewBadRequest("Invalid request body: " + err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	if req.Username == "" {
		apiErr := types.NewValidation("username is required")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	principal, err := h.svc.CreatePrincipal(c.Context(), &req)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.Status(fiber.StatusCreated).JSON(types.NewDataResponse(principal, reqID))
}

// DeletePrincipal handles DELETE /api/v1/carddav/principals/:username
func (h *CardDAVHandler) DeletePrincipal(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)
	username := c.Params("username")

	if err := h.svc.DeletePrincipal(c.Context(), username); err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(fiber.Map{"username": username, "deleted": true}, reqID))
}

// --- Address Books ---

// ListAddressBooks handles GET /api/v1/carddav/addressbooks
func (h *CardDAVHandler) ListAddressBooks(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)
	principal := c.Query("principal")

	books, err := h.svc.ListAddressBooks(c.Context(), principal)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(books, reqID))
}

// GetAddressBook handles GET /api/v1/carddav/addressbooks/:id
func (h *CardDAVHandler) GetAddressBook(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid address book ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	book, err := h.svc.GetAddressBook(c.Context(), id)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}
	if book == nil {
		apiErr := types.NewNotFound("Address book not found")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(book, reqID))
}

// CreateAddressBook handles POST /api/v1/carddav/addressbooks
func (h *CardDAVHandler) CreateAddressBook(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	var req types.AddressBookCreate
	if err := c.BodyParser(&req); err != nil {
		apiErr := types.NewBadRequest("Invalid request body: " + err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	if req.PrincipalURI == "" || req.DisplayName == "" || req.URI == "" {
		apiErr := types.NewValidation("principalUri, displayName, and uri are required")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	book, err := h.svc.CreateAddressBook(c.Context(), &req)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.Status(fiber.StatusCreated).JSON(types.NewDataResponse(book, reqID))
}

// UpdateAddressBook handles PUT /api/v1/carddav/addressbooks/:id
func (h *CardDAVHandler) UpdateAddressBook(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid address book ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	var req types.AddressBookUpdate
	if err := c.BodyParser(&req); err != nil {
		apiErr := types.NewBadRequest("Invalid request body: " + err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	book, err := h.svc.UpdateAddressBook(c.Context(), id, &req)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}
	if book == nil {
		apiErr := types.NewNotFound("Address book not found")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(book, reqID))
}

// DeleteAddressBook handles DELETE /api/v1/carddav/addressbooks/:id
func (h *CardDAVHandler) DeleteAddressBook(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid address book ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	if err := h.svc.DeleteAddressBook(c.Context(), id); err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(fiber.Map{"id": id, "deleted": true}, reqID))
}

// --- Contacts ---

// ListContacts handles GET /api/v1/carddav/addressbooks/:id/contacts
func (h *CardDAVHandler) ListContacts(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid address book ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	contacts, err := h.svc.ListContacts(c.Context(), id)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(contacts, reqID))
}

// GetContact handles GET /api/v1/carddav/addressbooks/:id/contacts/:uri
func (h *CardDAVHandler) GetContact(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid address book ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}
	uri := c.Params("uri")

	contact, err := h.svc.GetContact(c.Context(), id, uri)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}
	if contact == nil {
		apiErr := types.NewNotFound("Contact not found")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(contact, reqID))
}

// CreateContact handles POST /api/v1/carddav/addressbooks/:id/contacts
func (h *CardDAVHandler) CreateContact(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid address book ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	var req types.ContactCreate
	if err := c.BodyParser(&req); err != nil {
		apiErr := types.NewBadRequest("Invalid request body: " + err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	if req.URI == "" || req.CardData == "" {
		apiErr := types.NewValidation("uri and cardData are required")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	contact, err := h.svc.CreateContact(c.Context(), id, &req)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.Status(fiber.StatusCreated).JSON(types.NewDataResponse(contact, reqID))
}

// UpdateContact handles PUT /api/v1/carddav/addressbooks/:id/contacts/:uri
func (h *CardDAVHandler) UpdateContact(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid address book ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}
	uri := c.Params("uri")

	var req types.ContactUpdate
	if err := c.BodyParser(&req); err != nil {
		apiErr := types.NewBadRequest("Invalid request body: " + err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	if req.CardData == "" {
		apiErr := types.NewValidation("cardData is required")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	contact, err := h.svc.UpdateContact(c.Context(), id, uri, &req)
	if err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}
	if contact == nil {
		apiErr := types.NewNotFound("Contact not found")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(contact, reqID))
}

// DeleteContact handles DELETE /api/v1/carddav/addressbooks/:id/contacts/:uri
func (h *CardDAVHandler) DeleteContact(c *fiber.Ctx) error {
	reqID := middleware.GetRequestID(c)

	id, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		apiErr := types.NewBadRequest("Invalid address book ID")
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}
	uri := c.Params("uri")

	if err := h.svc.DeleteContact(c.Context(), id, uri); err != nil {
		apiErr := types.NewInternal(err.Error())
		return c.Status(apiErr.Status).JSON(types.NewErrorResponse(apiErr, reqID))
	}

	return c.JSON(types.NewDataResponse(fiber.Map{"addressbookId": id, "uri": uri, "deleted": true}, reqID))
}