package model

import (
	"time"

	"gorm.io/datatypes"
)

// WidgetFileUploadStatus constants for the staged upload process.
type WidgetFileUploadStatus string

const (
	WidgetFileUploadStatusPending  WidgetFileUploadStatus = "pending"  // File uploaded, awaiting attachment to message
	WidgetFileUploadStatusAttached WidgetFileUploadStatus = "attached" // File attached to a message
	WidgetFileUploadStatusExpired  WidgetFileUploadStatus = "expired"  // Upload expired (not attached within timeout)
)

// WidgetFileUpload stores metadata about a file uploaded through the web widget.
// Reference: Chatwoot widget SDK file upload — attachment processing pipeline
// Widget file uploads go through a staged process:
//   1. Visitor selects file in widget
//   2. File is uploaded to storage via /widget/uploads endpoint
//   3. Upload record is created with status "pending"
//   4. When message is sent with attachment, status changes to "attached"
type WidgetFileUpload struct {
	Base
	UploadUUID      string                 `gorm:"size:36;uniqueIndex;not null" json:"upload_uuid"`  // UUID for public-facing tracking (website_token staging)
	WidgetToken     string                 `gorm:"size:255;index" json:"widget_token,omitempty"`     // Links to the widget session (widget_token auth)
	InboxID         uint                   `gorm:"index;not null" json:"inbox_id"`                  // The inbox this upload belongs to
	ContactID       uint                   `gorm:"index" json:"contact_id,omitempty"`               // Contact who uploaded (may be 0 for anonymous)
	Status          WidgetFileUploadStatus `gorm:"size:20;default:'pending';index" json:"status"`  // "pending", "attached", "expired"

	// === File metadata ===
	OriginalName    string         `gorm:"size:255;not null" json:"original_name"`          // Original filename from user
	FileType        string         `gorm:"size:50;not null" json:"file_type"`               // MIME type / category: "image", "audio", "video", "file"
	MimeType        string         `gorm:"size:100" json:"mime_type,omitempty"`             // Full MIME type (e.g. "image/png")
	FileSize        int64          `gorm:"not null" json:"file_size"`                        // File size in bytes
	FileURL         string         `gorm:"size:512" json:"file_url,omitempty"`              // URL where file is stored (after upload)
	ThumbURL        string         `gorm:"size:512" json:"thumb_url,omitempty"`             // Thumbnail URL (for images)

	// === Dimensions (for images/videos) ===
	Width           int            `json:"width,omitempty"`
	Height          int            `json:"height,omitempty"`

	// === Processing ===
	Metadata        datatypes.JSON `gorm:"type:jsonb" json:"metadata,omitempty"`           // Additional metadata (checksums, etc)
	MessageID       *uint          `gorm:"index" json:"message_id,omitempty"`               // Linked message (after attachment)
	ExpiresAt       time.Time      `gorm:"index" json:"expires_at"`                         // Expiry timestamp for cleanup

	Inbox Inbox `gorm:"foreignKey:InboxID" json:"inbox,omitempty"`
}

func (WidgetFileUpload) TableName() string { return "widget_file_uploads" }

// WidgetUploadAllowedTypes defines the allowed MIME types for widget uploads.
// Reference: Chatwoot widget SDK config — allowed file types restriction
var WidgetUploadAllowedTypes = map[string][]string{
	"image":  {"image/png", "image/jpeg", "image/gif", "image/webp", "image/svg+xml"},
	"audio":  {"audio/mp3", "audio/ogg", "audio/wav", "audio/webm", "audio/mpeg"},
	"video":  {"video/mp4", "video/webm", "video/ogg"},
	"file":   {"application/pdf", "application/vnd.ms-excel", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
		"application/msword", "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
		"text/plain", "text/csv"},
}

// WidgetUploadMaxSizeByType defines max file sizes per category.
var WidgetUploadMaxSizeByType = map[string]int64{
	"image": 5 * 1024 * 1024,   // 5MB for images
	"audio": 10 * 1024 * 1024,  // 10MB for audio
	"video": 15 * 1024 * 1024,  // 15MB for video
	"file":  10 * 1024 * 1024,  // 10MB for documents
}