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"
)

// CaptainTaskHandler handles Captain AI task API endpoints.
// Reference: Chatwoot enterprise/app/controllers/api/v1/accounts/captain/tasks_controller.rb
// Tasks are standalone AI suggestions (reply_suggestion, summarize, rewrite)
// independent of the CopilotThread chat flow.
type CaptainTaskHandler struct {
	svc *service.CaptainTaskService
}

// NewCaptainTaskHandler creates a new CaptainTaskHandler.
func NewCaptainTaskHandler(svc *service.CaptainTaskService) *CaptainTaskHandler {
	return &CaptainTaskHandler{svc: svc}
}

// ReplySuggestion generates reply suggestions for a conversation.
// POST /api/v1/accounts/:account_id/captain/tasks/reply_suggestion
func (h *CaptainTaskHandler) ReplySuggestion(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.TaskReplySuggestionRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	result, err := h.svc.ReplySuggestion(c.Request.Context(), uint(accountID), &req)
	if err != nil {
		applogger.L().Errorf("ReplySuggestion: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to generate reply suggestions")
		return
	}

	response.OK(c, result)
}

// Summarize generates a conversation summary.
// POST /api/v1/accounts/:account_id/captain/tasks/summarize
func (h *CaptainTaskHandler) Summarize(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.TaskSummarizeRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	result, err := h.svc.Summarize(c.Request.Context(), uint(accountID), &req)
	if err != nil {
		applogger.L().Errorf("Summarize: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to summarize conversation")
		return
	}

	response.OK(c, result)
}

// Rewrite rewrites a draft message to improve tone and clarity.
// POST /api/v1/accounts/:account_id/captain/tasks/rewrite
func (h *CaptainTaskHandler) Rewrite(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.TaskRewriteRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	result, err := h.svc.Rewrite(c.Request.Context(), uint(accountID), &req)
	if err != nil {
		applogger.L().Errorf("Rewrite: %v", err)
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to rewrite message")
		return
	}

	response.OK(c, result)
}