package v1

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/service"
	applogger "github.com/gochat/gochat/pkg/logger"
	"github.com/gochat/gochat/pkg/response"
)

// CaptainAssistantResponseHandler handles assistant response generation and storage.
// Reference: Chatwoot Captain::AssistantResponsesController
type CaptainAssistantResponseHandler struct {
	svc *service.CaptainAssistantResponseService
}

func NewCaptainAssistantResponseHandler(svc *service.CaptainAssistantResponseService) *CaptainAssistantResponseHandler {
	return &CaptainAssistantResponseHandler{svc: svc}
}

// ProcessResponse generates and optionally stores an assistant response.
// POST /api/v1/accounts/:id/captain/assistant_responses
func (h *CaptainAssistantResponseHandler) ProcessResponse(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	var req service.ProcessResponseRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	result, err := h.svc.ProcessResponse(c.Request.Context(), uint(accountID), &req)
	if err != nil {
		applogger.L().Errorf("Process assistant response: %v", err)
		response.AbortWithStatusError(c, http.StatusUnprocessableEntity, response.ErrInternal, "failed to process assistant response")
		return
	}

	response.OK(c, result)
}

// List returns paginated assistant responses.
// GET /api/v1/accounts/:id/captain/assistant_responses
// Reference: Chatwoot Captain::AssistantResponsesController#index
func (h *CaptainAssistantResponseHandler) List(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("per_page", "25"))
	assistantID, _ := strconv.ParseUint(c.Query("assistant_id"), 10, 64)
	documentID, _ := strconv.ParseUint(c.Query("document_id"), 10, 64)
	status := c.Query("status")
	search := c.Query("search")

	responses, total, err := h.svc.List(c.Request.Context(), uint(accountID), uint(assistantID), uint(documentID), status, search, page, pageSize)
	if err != nil {
		applogger.L().Errorf("List assistant responses: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to list responses")
		return
	}
	response.OKWithMeta(c, responses, page, pageSize, total)
}

// Get returns a single assistant response.
// GET /api/v1/accounts/:id/captain/assistant_responses/:response_id
// Reference: Chatwoot Captain::AssistantResponsesController#show
func (h *CaptainAssistantResponseHandler) Get(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	responseID, err := strconv.ParseUint(c.Param("response_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid response_id")
		return
	}
	resp, err := h.svc.Get(c.Request.Context(), uint(accountID), uint(responseID))
	if err != nil {
		applogger.L().Errorf("Get assistant response: %v", err)
		response.AbortWithStatusError(c, http.StatusNotFound, response.ErrNotFound, "response not found")
		return
	}
	response.OK(c, resp)
}

// Update modifies an assistant response.
// PUT /api/v1/accounts/:id/captain/assistant_responses/:response_id
// Reference: Chatwoot Captain::AssistantResponsesController#update
func (h *CaptainAssistantResponseHandler) Update(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	responseID, err := strconv.ParseUint(c.Param("response_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid response_id")
		return
	}
	var req struct {
		Question string `json:"question"`
		Answer   string `json:"answer"`
		Status   string `json:"status"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}
	resp, err := h.svc.Update(c.Request.Context(), uint(accountID), uint(responseID), req.Question, req.Answer, req.Status)
	if err != nil {
		applogger.L().Errorf("Update assistant response: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to update response")
		return
	}
	response.OK(c, resp)
}

// Delete removes an assistant response.
// DELETE /api/v1/accounts/:id/captain/assistant_responses/:response_id
// Reference: Chatwoot Captain::AssistantResponsesController#destroy (head :no_content)
func (h *CaptainAssistantResponseHandler) Delete(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	responseID, err := strconv.ParseUint(c.Param("response_id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid response_id")
		return
	}
	if err := h.svc.Delete(c.Request.Context(), uint(accountID), uint(responseID)); err != nil {
		applogger.L().Errorf("Delete assistant response: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to delete response")
		return
	}
	// 1:1 Chatwoot: head :no_content → 204
	c.Status(http.StatusNoContent)
}

// Create creates a new assistant response.
// POST /api/v1/accounts/:id/captain/assistant_responses
// Reference: Chatwoot Captain::AssistantResponsesController#create
func (h *CaptainAssistantResponseHandler) Create(c *gin.Context) {
	accountID, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	userID := getUserID(c)
	if userID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "user not authenticated")
		return
	}

	var req struct {
		Question    string `json:"question" validate:"required"`
		Answer      string `json:"answer" validate:"required"`
		AssistantID uint   `json:"assistant_id" validate:"required"`
		Status      string `json:"status"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	resp, err := h.svc.Create(c.Request.Context(), uint(accountID), userID, req.AssistantID, req.Question, req.Answer, req.Status)
	if err != nil {
		applogger.L().Errorf("Create assistant response: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to create response")
		return
	}
	response.OK(c, resp)
}