package transport

import (
	"strconv"

	"github.com/gin-gonic/gin"

	"github.com/geo-platform/tenant-api/internal/bootstrap"
	"github.com/geo-platform/tenant-api/internal/shared/response"
	"github.com/geo-platform/tenant-api/internal/tenant/app"
)

type QuestionExpansionHandler struct {
	svc *app.QuestionExpansionService
}

func NewQuestionExpansionHandler(a *bootstrap.App) *QuestionExpansionHandler {
	return &QuestionExpansionHandler{svc: a.QuestionExpansion}
}

func (h *QuestionExpansionHandler) CombinationPreview(c *gin.Context) {
	brandID, ok := parseBrandIDParam(c)
	if !ok {
		return
	}
	var req app.QuestionCombinationRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	data, err := h.svc.GenerateByCombination(c.Request.Context(), brandID, req)
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func (h *QuestionExpansionHandler) CombinationFill(c *gin.Context) {
	brandID, ok := parseBrandIDParam(c)
	if !ok {
		return
	}
	var req app.QuestionCombinationFillRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	data, err := h.svc.FillQuestionCombination(c.Request.Context(), brandID, c.ClientIP(), req)
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func (h *QuestionExpansionHandler) AIDistill(c *gin.Context) {
	brandID, ok := parseBrandIDParam(c)
	if !ok {
		return
	}
	var req app.QuestionDistillRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	data, err := h.svc.GenerateByAIDistill(c.Request.Context(), brandID, req)
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func (h *QuestionExpansionHandler) ClassifyMetadata(c *gin.Context) {
	brandID, ok := parseBrandIDParam(c)
	if !ok {
		return
	}
	var req struct {
		Texts []string `json:"texts" binding:"required,min=1"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	data, err := h.svc.ClassifyMetadata(c.Request.Context(), brandID, req.Texts)
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func (h *QuestionExpansionHandler) Materialize(c *gin.Context) {
	brandID, ok := parseBrandIDParam(c)
	if !ok {
		return
	}
	var req app.MaterializeQuestionsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, response.ErrBadRequest(40001, "invalid_params", err.Error()))
		return
	}
	data, err := h.svc.MaterializeQuestions(c.Request.Context(), brandID, req)
	if err != nil {
		response.Error(c, err)
		return
	}
	response.Success(c, data)
}

func parseBrandIDParam(c *gin.Context) (int64, bool) {
	brandID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil || brandID <= 0 {
		response.Error(c, response.ErrBadRequest(40001, "invalid_id", "brand id must be a number"))
		return 0, false
	}
	return brandID, true
}