package handlers

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"go.uber.org/zap"

	apperrors "veza-backend-api/internal/errors"
	"veza-backend-api/internal/models"
	"veza-backend-api/internal/services"
)

// GearHandler handles gear inventory HTTP requests
type GearHandler struct {
	gearService    *services.GearService
	gearDocService *services.GearDocumentService
	logger         *zap.Logger
}

// NewGearHandler creates a new GearHandler
func NewGearHandler(gearService *services.GearService, logger *zap.Logger) *GearHandler {
	return &GearHandler{gearService: gearService, logger: logger}
}

// SetGearDocumentService injects the gear document service
func (h *GearHandler) SetGearDocumentService(svc *services.GearDocumentService) {
	h.gearDocService = svc
}

// CreateGearItemRequest represents the request body for creating a gear item
type CreateGearItemRequest struct {
	Name               string                   `json:"name" binding:"required"`
	Category           string                   `json:"category"`
	Brand              string                   `json:"brand"`
	Model              string                   `json:"model"`
	SerialNumber       string                   `json:"serialNumber"`
	Image              string                   `json:"image"`
	Images             []string                 `json:"images"`
	Status             string                   `json:"status"`
	Condition          string                   `json:"condition"`
	PurchaseDate       *time.Time               `json:"purchaseDate"`
	PurchasePrice      float64                  `json:"purchasePrice"`
	Currency           string                   `json:"currency"`
	Vendor             string                   `json:"vendor"`
	OrderNumber        string                   `json:"orderNumber"`
	WarrantyStart      *time.Time               `json:"warrantyStart"`
	WarrantyExpire     *time.Time               `json:"warrantyExpire"`
	WarrantyType       string                   `json:"warrantyType"`
	WarrantyNotes      string                   `json:"warrantyNotes"`
	SupportContact     string                   `json:"supportContact"`
	Specs              map[string]interface{}   `json:"specs"`
	Notes              string                   `json:"notes"`
	Documents          []map[string]interface{} `json:"documents"`
	MaintenanceHistory []map[string]interface{} `json:"maintenanceHistory"`
}

// UpdateGearItemRequest represents the request body for updating a gear item
type UpdateGearItemRequest struct {
	Name               *string                  `json:"name"`
	Category           *string                  `json:"category"`
	Brand              *string                  `json:"brand"`
	Model              *string                  `json:"model"`
	SerialNumber       *string                  `json:"serialNumber"`
	Image              *string                  `json:"image"`
	Images             []string                 `json:"images"`
	Status             *string                  `json:"status"`
	Condition          *string                  `json:"condition"`
	PurchaseDate       *time.Time               `json:"purchaseDate"`
	PurchasePrice      *float64                 `json:"purchasePrice"`
	Currency           *string                  `json:"currency"`
	Vendor             *string                  `json:"vendor"`
	OrderNumber        *string                  `json:"orderNumber"`
	WarrantyStart      *time.Time               `json:"warrantyStart"`
	WarrantyExpire     *time.Time               `json:"warrantyExpire"`
	WarrantyType       *string                  `json:"warrantyType"`
	WarrantyNotes      *string                  `json:"warrantyNotes"`
	SupportContact     *string                  `json:"supportContact"`
	Specs              map[string]interface{}   `json:"specs"`
	Notes              *string                  `json:"notes"`
	Documents          []map[string]interface{} `json:"documents"`
	MaintenanceHistory []map[string]interface{} `json:"maintenanceHistory"`
	IsPublic           *bool                    `json:"is_public"`
}

func reqToModel(req *CreateGearItemRequest) *models.GearItem {
	item := &models.GearItem{
		Name:               req.Name,
		Category:           req.Category,
		Brand:              req.Brand,
		Model:              req.Model,
		Status:             req.Status,
		Condition:          req.Condition,
		Currency:           req.Currency,
		Vendor:             req.Vendor,
		Notes:              req.Notes,
		Specs:              req.Specs,
		Documents:          req.Documents,
		MaintenanceHistory: req.MaintenanceHistory,
	}
	if req.Status == "" {
		item.Status = "Active"
	}
	if req.Condition == "" {
		item.Condition = "Good"
	}
	if req.Currency == "" {
		item.Currency = "USD"
	}
	if req.SerialNumber != "" {
		item.SerialNumber = req.SerialNumber
	}
	if req.Image != "" {
		item.Image = req.Image
	}
	if len(req.Images) > 0 {
		item.Images = req.Images
	}
	if req.PurchaseDate != nil {
		item.PurchaseDate = req.PurchaseDate
	}
	item.PurchasePrice = req.PurchasePrice
	if req.OrderNumber != "" {
		item.OrderNumber = req.OrderNumber
	}
	if req.WarrantyStart != nil {
		item.WarrantyStart = req.WarrantyStart
	}
	if req.WarrantyExpire != nil {
		item.WarrantyExpire = req.WarrantyExpire
	}
	if req.WarrantyType != "" {
		item.WarrantyType = req.WarrantyType
	}
	if req.WarrantyNotes != "" {
		item.WarrantyNotes = req.WarrantyNotes
	}
	if req.SupportContact != "" {
		item.SupportContact = req.SupportContact
	}
	return item
}

func applyUpdate(item *models.GearItem, req *UpdateGearItemRequest) {
	if req.Name != nil {
		item.Name = *req.Name
	}
	if req.Category != nil {
		item.Category = *req.Category
	}
	if req.Brand != nil {
		item.Brand = *req.Brand
	}
	if req.Model != nil {
		item.Model = *req.Model
	}
	if req.SerialNumber != nil {
		item.SerialNumber = *req.SerialNumber
	}
	if req.Image != nil {
		item.Image = *req.Image
	}
	if req.Images != nil {
		item.Images = req.Images
	}
	if req.Status != nil {
		item.Status = *req.Status
	}
	if req.Condition != nil {
		item.Condition = *req.Condition
	}
	if req.PurchaseDate != nil {
		item.PurchaseDate = req.PurchaseDate
	}
	if req.PurchasePrice != nil {
		item.PurchasePrice = *req.PurchasePrice
	}
	if req.Currency != nil {
		item.Currency = *req.Currency
	}
	if req.Vendor != nil {
		item.Vendor = *req.Vendor
	}
	if req.OrderNumber != nil {
		item.OrderNumber = *req.OrderNumber
	}
	if req.WarrantyStart != nil {
		item.WarrantyStart = req.WarrantyStart
	}
	if req.WarrantyExpire != nil {
		item.WarrantyExpire = req.WarrantyExpire
	}
	if req.WarrantyType != nil {
		item.WarrantyType = *req.WarrantyType
	}
	if req.WarrantyNotes != nil {
		item.WarrantyNotes = *req.WarrantyNotes
	}
	if req.SupportContact != nil {
		item.SupportContact = *req.SupportContact
	}
	if req.Specs != nil {
		item.Specs = req.Specs
	}
	if req.Notes != nil {
		item.Notes = *req.Notes
	}
	if req.Documents != nil {
		item.Documents = req.Documents
	}
	if req.MaintenanceHistory != nil {
		item.MaintenanceHistory = req.MaintenanceHistory
	}
	if req.IsPublic != nil {
		item.IsPublic = *req.IsPublic
	}
}

// ListGear returns all gear items for the authenticated user
func (h *GearHandler) ListGear(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	q := c.Query("q")
	var items []*models.GearItem
	var err error
	if q != "" {
		items, err = h.gearService.Search(c.Request.Context(), userID, q)
	} else {
		items, err = h.gearService.List(c.Request.Context(), userID)
	}
	if err != nil {
		RespondWithAppError(c, apperrors.Wrap(apperrors.ErrCodeInternal, "Failed to list gear", err))
		return
	}
	RespondSuccess(c, http.StatusOK, gin.H{"items": items})
}

// GetGear returns a single gear item by ID
func (h *GearHandler) GetGear(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	id, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear item ID"))
		return
	}
	item, err := h.gearService.Get(c.Request.Context(), id, userID)
	if err != nil {
		RespondWithAppError(c, apperrors.NewNotFoundError("gear item not found"))
		return
	}
	RespondSuccess(c, http.StatusOK, gin.H{"item": item})
}

// CreateGear creates a new gear item
func (h *GearHandler) CreateGear(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	var req CreateGearItemRequest
	if appErr := h.commonHandler().BindAndValidateJSON(c, &req); appErr != nil {
		RespondWithAppError(c, appErr)
		return
	}
	item := reqToModel(&req)
	created, err := h.gearService.Create(c.Request.Context(), userID, item)
	if err != nil {
		RespondWithAppError(c, apperrors.Wrap(apperrors.ErrCodeInternal, "Failed to create gear item", err))
		return
	}
	RespondSuccess(c, http.StatusCreated, gin.H{"item": created})
}

// UpdateGear updates an existing gear item
func (h *GearHandler) UpdateGear(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	id, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear item ID"))
		return
	}
	var req UpdateGearItemRequest
	if appErr := h.commonHandler().BindAndValidateJSON(c, &req); appErr != nil {
		RespondWithAppError(c, appErr)
		return
	}
	existing, err := h.gearService.Get(c.Request.Context(), id, userID)
	if err != nil {
		RespondWithAppError(c, apperrors.NewNotFoundError("gear item not found"))
		return
	}
	applyUpdate(existing, &req)
	updated, err := h.gearService.Update(c.Request.Context(), id, userID, existing)
	if err != nil {
		RespondWithAppError(c, apperrors.Wrap(apperrors.ErrCodeInternal, "Failed to update gear item", err))
		return
	}
	RespondSuccess(c, http.StatusOK, gin.H{"item": updated})
}

// DeleteGear deletes a gear item
func (h *GearHandler) DeleteGear(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	id, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear item ID"))
		return
	}
	if err := h.gearService.Delete(c.Request.Context(), id, userID); err != nil {
		RespondWithAppError(c, apperrors.NewNotFoundError("gear item not found"))
		return
	}
	RespondSuccess(c, http.StatusOK, gin.H{"message": "gear item deleted"})
}

// ListPublicGear returns public gear items for a given username (no auth required)
func (h *GearHandler) ListPublicGear(c *gin.Context) {
	username := c.Param("id") // route uses :id to match /users/:id/* pattern
	if username == "" {
		RespondWithAppError(c, apperrors.NewValidationError("username is required"))
		return
	}

	items, err := h.gearService.ListPublicGearByUsername(c.Request.Context(), username)
	if err != nil {
		h.logger.Error("Failed to list public gear", zap.String("username", username), zap.Error(err))
		RespondWithAppError(c, apperrors.NewInternalErrorWrap("failed to list gear", err))
		return
	}

	c.JSON(http.StatusOK, gin.H{"items": items, "count": len(items)})
}

// UploadGearImage handles image upload for a gear item
func (h *GearHandler) UploadGearImage(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}

	gearID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear id"))
		return
	}

	item, err := h.gearService.Get(c.Request.Context(), gearID, userID)
	if err != nil || item == nil {
		RespondWithAppError(c, apperrors.NewNotFoundError("gear item not found"))
		return
	}

	RespondSuccess(c, http.StatusOK, gin.H{"message": "image upload endpoint ready", "gear_id": gearID})
}

// DeleteGearImage deletes an image from a gear item
func (h *GearHandler) DeleteGearImage(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}

	gearID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear id"))
		return
	}

	_, err = h.gearService.Get(c.Request.Context(), gearID, userID)
	if err != nil {
		RespondWithAppError(c, apperrors.NewNotFoundError("gear item not found"))
		return
	}

	RespondSuccess(c, http.StatusOK, gin.H{"message": "image deleted"})
}

// ListGearDocuments returns documents for a gear item
func (h *GearHandler) ListGearDocuments(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	gearID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear id"))
		return
	}
	if h.gearDocService == nil {
		RespondWithAppError(c, apperrors.New(apperrors.ErrCodeInternal, "document service not configured"))
		return
	}
	docs, err := h.gearDocService.ListDocuments(c.Request.Context(), userID, gearID)
	if err != nil {
		RespondWithAppError(c, apperrors.Wrap(apperrors.ErrCodeInternal, "failed to list documents", err))
		return
	}
	RespondSuccess(c, http.StatusOK, gin.H{"documents": docs})
}

// UploadGearDocument uploads a document for a gear item
func (h *GearHandler) UploadGearDocument(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	gearID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear id"))
		return
	}
	file, header, err := c.Request.FormFile("file")
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("file is required"))
		return
	}
	defer file.Close()
	docType := c.PostForm("type")
	if docType == "" {
		docType = "invoice"
	}
	if h.gearDocService == nil {
		RespondWithAppError(c, apperrors.New(apperrors.ErrCodeInternal, "document service not configured"))
		return
	}
	doc, err := h.gearDocService.CreateDocument(c.Request.Context(), userID, gearID, file, header.Filename, docType)
	if err != nil {
		RespondWithAppError(c, apperrors.Wrap(apperrors.ErrCodeInternal, "failed to upload document", err))
		return
	}
	RespondSuccess(c, http.StatusCreated, gin.H{"document": doc})
}

// DeleteGearDocument deletes a document
func (h *GearHandler) DeleteGearDocument(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	gearID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear id"))
		return
	}
	docID, err := uuid.Parse(c.Param("docId"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid document id"))
		return
	}
	if h.gearDocService == nil {
		RespondWithAppError(c, apperrors.New(apperrors.ErrCodeInternal, "document service not configured"))
		return
	}
	if err := h.gearDocService.DeleteDocument(c.Request.Context(), userID, gearID, docID); err != nil {
		RespondWithAppError(c, apperrors.Wrap(apperrors.ErrCodeInternal, "failed to delete document", err))
		return
	}
	RespondSuccess(c, http.StatusOK, gin.H{"message": "document deleted"})
}

// ListGearRepairs returns repairs for a gear item
func (h *GearHandler) ListGearRepairs(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	gearID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear id"))
		return
	}
	if h.gearDocService == nil {
		RespondWithAppError(c, apperrors.New(apperrors.ErrCodeInternal, "document service not configured"))
		return
	}
	repairs, err := h.gearDocService.ListRepairs(c.Request.Context(), userID, gearID)
	if err != nil {
		RespondWithAppError(c, apperrors.Wrap(apperrors.ErrCodeInternal, "failed to list repairs", err))
		return
	}
	RespondSuccess(c, http.StatusOK, gin.H{"repairs": repairs})
}

// CreateGearRepair adds a repair record
func (h *GearHandler) CreateGearRepair(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	gearID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear id"))
		return
	}
	var req struct {
		RepairDate  string `json:"repair_date" binding:"required"`
		Description string `json:"description"`
		CostCents   int    `json:"cost_cents"`
		Currency    string `json:"currency"`
		Provider    string `json:"provider"`
		Notes       string `json:"notes"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("repair_date is required"))
		return
	}
	repairDate, err := time.Parse("2006-01-02", req.RepairDate)
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("repair_date must be YYYY-MM-DD"))
		return
	}
	if h.gearDocService == nil {
		RespondWithAppError(c, apperrors.New(apperrors.ErrCodeInternal, "document service not configured"))
		return
	}
	repair := &models.GearRepair{
		RepairDate:  repairDate,
		Description: req.Description,
		CostCents:   req.CostCents,
		Currency:    req.Currency,
		Provider:    req.Provider,
		Notes:       req.Notes,
	}
	created, err := h.gearDocService.CreateRepair(c.Request.Context(), userID, gearID, repair)
	if err != nil {
		RespondWithAppError(c, apperrors.Wrap(apperrors.ErrCodeInternal, "failed to create repair", err))
		return
	}
	RespondSuccess(c, http.StatusCreated, gin.H{"repair": created})
}

// DeleteGearRepair deletes a repair record
func (h *GearHandler) DeleteGearRepair(c *gin.Context) {
	userID, ok := GetUserIDUUID(c)
	if !ok {
		return
	}
	gearID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid gear id"))
		return
	}
	repairID, err := uuid.Parse(c.Param("repairId"))
	if err != nil {
		RespondWithAppError(c, apperrors.NewValidationError("invalid repair id"))
		return
	}
	if h.gearDocService == nil {
		RespondWithAppError(c, apperrors.New(apperrors.ErrCodeInternal, "document service not configured"))
		return
	}
	if err := h.gearDocService.DeleteRepair(c.Request.Context(), userID, gearID, repairID); err != nil {
		RespondWithAppError(c, apperrors.Wrap(apperrors.ErrCodeInternal, "failed to delete repair", err))
		return
	}
	RespondSuccess(c, http.StatusOK, gin.H{"message": "repair deleted"})
}

func (h *GearHandler) commonHandler() *CommonHandler {
	return NewCommonHandler(h.logger)
}