package controllers

import (
	"lost-and-found/internal/models"
	"lost-and-found/internal/services"
	"lost-and-found/internal/utils"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

type ClaimController struct {
	claimService        *services.ClaimService
	verificationService *services.VerificationService
}

func NewClaimController(db *gorm.DB) *ClaimController {
	return &ClaimController{
		claimService:        services.NewClaimService(db),
		verificationService: services.NewVerificationService(db),
	}
}

// GetAllClaims gets all claims
// GET /api/claims
func (c *ClaimController) GetAllClaims(ctx *gin.Context) {
	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
	limit, _ := strconv.Atoi(ctx.DefaultQuery("limit", "10"))
	status := ctx.Query("status")

	var itemID, userID *uint
	if itemIDStr := ctx.Query("item_id"); itemIDStr != "" {
		id, _ := strconv.ParseUint(itemIDStr, 10, 32)
		itemID = new(uint)
		*itemID = uint(id)
	}

	// If regular user, only show their claims
	if userObj, exists := ctx.Get("user"); exists {
		user := userObj.(*models.User)
		if user.IsUser() {
			userID = &user.ID
		}
	}

	claims, total, err := c.claimService.GetAllClaims(page, limit, status, itemID, userID)
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusInternalServerError, "Failed to get claims", err.Error())
		return
	}

	utils.SendPaginatedResponse(ctx, http.StatusOK, "Claims retrieved", claims, total, page, limit)
}

// GetClaimByID gets claim by ID
// GET /api/claims/:id
func (c *ClaimController) GetClaimByID(ctx *gin.Context) {
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Invalid claim ID", err.Error())
		return
	}

	isManager := false
	if userObj, exists := ctx.Get("user"); exists {
		user := userObj.(*models.User)
		isManager = user.IsManager() || user.IsAdmin()
	}

	claim, err := c.claimService.GetClaimByID(uint(id), isManager)
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusNotFound, "Claim not found", err.Error())
		return
	}

	utils.SuccessResponse(ctx, http.StatusOK, "Claim retrieved", claim)
}

// CreateClaim creates a new claim
// POST /api/claims
func (c *ClaimController) CreateClaim(ctx *gin.Context) {
	userObj, _ := ctx.Get("user")
	user := userObj.(*models.User)

	var req services.CreateClaimRequest
	if err := ctx.ShouldBindJSON(&req); err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Invalid request data", err.Error())
		return
	}

	ipAddress := ctx.ClientIP()
	userAgent := ctx.Request.UserAgent()

	claim, err := c.claimService.CreateClaim(user.ID, req, ipAddress, userAgent)
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Failed to create claim", err.Error())
		return
	}

	utils.SuccessResponse(ctx, http.StatusCreated, "Claim created", claim.ToResponse())
}

// VerifyClaim verifies a claim (manager only)
// POST /api/claims/:id/verify
func (c *ClaimController) VerifyClaim(ctx *gin.Context) {
	managerObj, _ := ctx.Get("user")
	manager := managerObj.(*models.User)

	claimID, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Invalid claim ID", err.Error())
		return
	}

	var req services.VerifyClaimRequest
	if err := ctx.ShouldBindJSON(&req); err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Invalid request data", err.Error())
		return
	}

	// Auto-verify description similarity
	verification, err := c.verificationService.VerifyClaimDescription(uint(claimID))
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusInternalServerError, "Verification failed", err.Error())
		return
	}

	ipAddress := ctx.ClientIP()
	userAgent := ctx.Request.UserAgent()

	// Verify the claim
	if err := c.claimService.VerifyClaim(
		manager.ID,
		uint(claimID),
		req,
		verification.SimilarityScore,
		stringSliceToString(verification.MatchedKeywords),
		ipAddress,
		userAgent,
	); err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Failed to verify claim", err.Error())
		return
	}

	utils.SuccessResponse(ctx, http.StatusOK, "Claim verified", gin.H{
		"verification": verification,
	})
}

// GetClaimVerification gets verification data for a claim
// GET /api/claims/:id/verification
func (c *ClaimController) GetClaimVerification(ctx *gin.Context) {
	claimID, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Invalid claim ID", err.Error())
		return
	}

	verification, err := c.verificationService.VerifyClaimDescription(uint(claimID))
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusInternalServerError, "Verification failed", err.Error())
		return
	}

	utils.SuccessResponse(ctx, http.StatusOK, "Verification retrieved", verification)
}

// CloseClaim closes a claim (manager only)
// POST /api/claims/:id/close
func (c *ClaimController) CloseClaim(ctx *gin.Context) {
	managerObj, _ := ctx.Get("user")
	manager := managerObj.(*models.User)

	claimID, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Invalid claim ID", err.Error())
		return
	}

	ipAddress := ctx.ClientIP()
	userAgent := ctx.Request.UserAgent()

	if err := c.claimService.CloseClaim(manager.ID, uint(claimID), ipAddress, userAgent); err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Failed to close claim", err.Error())
		return
	}

	utils.SuccessResponse(ctx, http.StatusOK, "Claim closed and archived", nil)
}

// DeleteClaim deletes a claim
// DELETE /api/claims/:id
func (c *ClaimController) DeleteClaim(ctx *gin.Context) {
	userObj, _ := ctx.Get("user")
	user := userObj.(*models.User)

	claimID, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Invalid claim ID", err.Error())
		return
	}

	ipAddress := ctx.ClientIP()
	userAgent := ctx.Request.UserAgent()

	if err := c.claimService.DeleteClaim(user.ID, uint(claimID), ipAddress, userAgent); err != nil {
		utils.ErrorResponse(ctx, http.StatusBadRequest, "Failed to delete claim", err.Error())
		return
	}

	utils.SuccessResponse(ctx, http.StatusOK, "Claim deleted", nil)
}

// GetClaimsByUser gets claims by user
// GET /api/user/claims
func (c *ClaimController) GetClaimsByUser(ctx *gin.Context) {
	userObj, _ := ctx.Get("user")
	user := userObj.(*models.User)

	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
	limit, _ := strconv.Atoi(ctx.DefaultQuery("limit", "10"))

	claims, total, err := c.claimService.GetClaimsByUser(user.ID, page, limit)
	if err != nil {
		utils.ErrorResponse(ctx, http.StatusInternalServerError, "Failed to get claims", err.Error())
		return
	}

	utils.SendPaginatedResponse(ctx, http.StatusOK, "Claims retrieved", claims, total, page, limit)
}

// Helper function to convert string slice to string
func stringSliceToString(slice []string) string {
	if len(slice) == 0 {
		return ""
	}
	result := ""
	for i, s := range slice {
		if i > 0 {
			result += ", "
		}
		result += s
	}
	return result
}