package v1

import (
	"net/http"

	"github.com/gin-gonic/gin"

	"github.com/gochat/gochat/internal/service"
	"github.com/gochat/gochat/pkg/pagination"
	"github.com/gochat/gochat/pkg/response"
)

// CustomAttributeDefinitionHandler handles CRUD for custom attribute definitions.
// Reference: Chatwoot app/controllers/api/v1/accounts/custom_attribute_definitions_controller.rb
type CustomAttributeDefinitionHandler struct {
	svc *service.CustomAttributeDefinitionService
}

// NewCustomAttributeDefinitionHandler creates a new handler with service injection.
func NewCustomAttributeDefinitionHandler(svc *service.CustomAttributeDefinitionService) *CustomAttributeDefinitionHandler {
	return &CustomAttributeDefinitionHandler{svc: svc}
}

// List retrieves all custom attribute definitions for an account.
// GET /api/v1/accounts/:account_id/custom_attribute_definitions
// Optional query param: attribute_model (conversation/contact) to filter by model type.
func (h *CustomAttributeDefinitionHandler) List(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	attributeModel := c.Query("attribute_model")
	page := pagination.Parse(c)

	defs, total, svcErr := h.svc.List(c.Request.Context(), accountID, attributeModel, page.Offset, page.PerPage)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OKWithMeta(c, defs, page.Page, page.PerPage, total)
}

// Get retrieves a single custom attribute definition by ID.
// GET /api/v1/accounts/:account_id/custom_attribute_definitions/:id
func (h *CustomAttributeDefinitionHandler) Get(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	id, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	def, svcErr := h.svc.Get(c.Request.Context(), accountID, id)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, def)
}

// Create creates a new custom attribute definition for an account.
// POST /api/v1/accounts/:account_id/custom_attribute_definitions
func (h *CustomAttributeDefinitionHandler) Create(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

// Chatwoot: params.require(:custom_attribute_definition) → {"custom_attribute_definition": {...}}
	var wrapper struct {
		CustomAttributeDefinition service.CreateCustomAttributeDefinitionRequest `json:"custom_attribute_definition"`
	}
	if err := c.ShouldBindJSON(&wrapper); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}
	req := wrapper.CustomAttributeDefinition

	def, svcErr := h.svc.Create(c.Request.Context(), accountID, &req)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.Created(c, def)
}

// Update modifies a custom attribute definition.
// PUT /api/v1/accounts/:account_id/custom_attribute_definitions/:id
func (h *CustomAttributeDefinitionHandler) Update(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	id, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	// Chatwoot: params.require(:custom_attribute_definition) → {"custom_attribute_definition": {...}}
	var wrapper struct {
		CustomAttributeDefinition service.UpdateCustomAttributeDefinitionRequest `json:"custom_attribute_definition"`
	}
	if err := c.ShouldBindJSON(&wrapper); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}
	req := wrapper.CustomAttributeDefinition

	def, svcErr := h.svc.Update(c.Request.Context(), accountID, id, &req)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, def)
}

// Delete soft-deletes a custom attribute definition.
// DELETE /api/v1/accounts/:account_id/custom_attribute_definitions/:id
func (h *CustomAttributeDefinitionHandler) Delete(c *gin.Context) {
	accountID, err := parseUintParam(c, "account_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	id, err := parseUintParam(c, "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	svcErr := h.svc.Delete(c.Request.Context(), accountID, id)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.NoContent(c)
}