package kb

import (
	"net/http"
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/yaoapp/yao/openapi/response"
)

// Vote Management Handlers

// ScrollVotes scrolls votes with iterator-style pagination for a specific segment
func ScrollVotes(c *gin.Context) {
	// Extract docID from URL path
	docID := c.Param("docID")
	if docID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Document ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Extract segmentID from URL path
	segmentID := c.Param("segmentID")
	if segmentID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Segment ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Parse query parameters for scroll options
	options := map[string]interface{}{
		"document_id": docID,
		"segment_id":  segmentID,
		"limit":       100, // Default limit
	}

	// Parse limit (default: 100)
	if limitStr := c.Query("limit"); limitStr != "" {
		if limit, err := strconv.Atoi(limitStr); err == nil && limit > 0 {
			options["limit"] = limit
		}
	}

	// Parse scroll_id parameter for continuing pagination
	if scrollID := strings.TrimSpace(c.Query("scroll_id")); scrollID != "" {
		options["scroll_id"] = scrollID
	}

	// Parse order_by parameter
	if orderBy := strings.TrimSpace(c.Query("order_by")); orderBy != "" {
		orderByFields := strings.Split(orderBy, ",")
		// Trim spaces from each field
		for i, field := range orderByFields {
			orderByFields[i] = strings.TrimSpace(field)
		}
		options["order_by"] = orderByFields
	}

	// Parse filter parameters
	filter := make(map[string]interface{})
	if voteType := c.Query("vote_type"); voteType != "" {
		filter["vote_type"] = voteType
	}
	if userID := c.Query("user_id"); userID != "" {
		filter["user_id"] = userID
	}
	if len(filter) > 0 {
		options["filter"] = filter
	}

	// TODO: Implement document permission validation for docID
	// TODO: Implement scroll votes logic with GraphRag or database
	// TODO: Call kb.Instance.ScrollVotes(c.Request.Context(), segmentID, options)

	// Return mock response for now
	result := gin.H{
		"votes":     []interface{}{},
		"scroll_id": nil,
		"has_more":  false,
		"total":     0,
		"options":   options,
	}

	response.RespondWithSuccess(c, response.StatusOK, result)
}

// GetVotes gets votes for a specific segment (simple list, no pagination)
func GetVotes(c *gin.Context) {
	// Extract docID from URL path
	docID := c.Param("docID")
	if docID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Document ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Extract segmentID from URL path
	segmentID := c.Param("segmentID")
	if segmentID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Segment ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Parse basic filter parameters
	filter := make(map[string]interface{})
	if voteType := c.Query("vote_type"); voteType != "" {
		filter["vote_type"] = voteType
	}
	if userID := c.Query("user_id"); userID != "" {
		filter["user_id"] = userID
	}

	// Parse limit parameter (optional, for basic limiting without pagination)
	var limit int
	if limitStr := c.Query("limit"); limitStr != "" {
		if l, err := strconv.Atoi(limitStr); err == nil && l > 0 {
			limit = l
		}
	}

	// TODO: Implement document permission validation for docID
	// TODO: Implement get votes logic (simple query without pagination)
	// TODO: Call kb.Instance.GetVotes(c.Request.Context(), segmentID, filter, limit)

	// Return mock response for now
	result := gin.H{
		"votes":       []interface{}{},
		"document_id": docID,
		"segment_id":  segmentID,
		"total":       0,
	}

	if len(filter) > 0 {
		result["filter"] = filter
	}
	if limit > 0 {
		result["limit"] = limit
	}

	response.RespondWithSuccess(c, response.StatusOK, result)
}

// GetVote gets a specific vote by ID
func GetVote(c *gin.Context) {
	// Extract docID from URL path
	docID := c.Param("docID")
	if docID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Document ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Extract segmentID from URL path
	segmentID := c.Param("segmentID")
	if segmentID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Segment ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Extract voteID from URL path
	voteID := c.Param("voteID")
	if voteID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Vote ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// TODO: Implement document permission validation for docID
	// TODO: Implement get vote detail logic
	c.JSON(http.StatusOK, gin.H{
		"vote":        nil,
		"document_id": docID,
		"segment_id":  segmentID,
		"vote_id":     voteID,
	})
}

// AddVotes adds new votes to a segment
func AddVotes(c *gin.Context) {
	// Extract docID from URL path
	docID := c.Param("docID")
	if docID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Document ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Extract segmentID from URL path
	segmentID := c.Param("segmentID")
	if segmentID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Segment ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// TODO: Implement document permission validation for docID
	// TODO: Implement add vote logic
	c.JSON(http.StatusOK, gin.H{
		"message":     "Vote added successfully",
		"document_id": docID,
		"segment_id":  segmentID,
		"vote_id":     "placeholder-vote-id",
	})
}

// UpdateVotes updates votes in batch
func UpdateVotes(c *gin.Context) {
	// Extract docID from URL path
	docID := c.Param("docID")
	if docID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Document ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Extract segmentID from URL path
	segmentID := c.Param("segmentID")
	if segmentID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Segment ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Parse vote_ids from query parameter or request body
	var voteIDs []string

	// Try query parameter first (comma-separated)
	if voteIDsParam := strings.TrimSpace(c.Query("vote_ids")); voteIDsParam != "" {
		voteIDs = strings.Split(voteIDsParam, ",")
		for i, id := range voteIDs {
			voteIDs[i] = strings.TrimSpace(id)
		}
	}

	// TODO: Also support request body with vote data for batch updates
	// TODO: Implement document permission validation for docID
	// TODO: Implement batch update vote logic

	result := gin.H{
		"message":       "Votes updated successfully",
		"document_id":   docID,
		"segment_id":    segmentID,
		"updated_count": len(voteIDs),
	}

	if len(voteIDs) > 0 {
		result["vote_ids"] = voteIDs
	}

	response.RespondWithSuccess(c, response.StatusOK, result)
}

// RemoveVotes removes votes from a segment in batch
func RemoveVotes(c *gin.Context) {
	// Extract docID from URL path
	docID := c.Param("docID")
	if docID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Document ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Extract segmentID from URL path
	segmentID := c.Param("segmentID")
	if segmentID == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "Segment ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Parse vote_ids from query parameter (comma-separated)
	voteIDsParam := strings.TrimSpace(c.Query("vote_ids"))
	if voteIDsParam == "" {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "vote_ids query parameter is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// Split comma-separated vote IDs
	voteIDs := strings.Split(voteIDsParam, ",")
	var validVoteIDs []string
	for _, id := range voteIDs {
		id = strings.TrimSpace(id)
		if id != "" {
			validVoteIDs = append(validVoteIDs, id)
		}
	}

	if len(validVoteIDs) == 0 {
		errorResp := &response.ErrorResponse{
			Code:             response.ErrInvalidRequest.Code,
			ErrorDescription: "At least one valid vote ID is required",
		}
		response.RespondWithError(c, response.StatusBadRequest, errorResp)
		return
	}

	// TODO: Implement document permission validation for docID
	// TODO: Implement batch remove vote logic

	result := gin.H{
		"message":       "Votes removed successfully",
		"document_id":   docID,
		"segment_id":    segmentID,
		"vote_ids":      validVoteIDs,
		"removed_count": len(validVoteIDs),
	}

	response.RespondWithSuccess(c, response.StatusOK, result)
}