package models

import (
	"time"

	"github.com/google/uuid"
)

// LegalDocument represents a type of legal document (e.g., Terms, Privacy Policy)
type LegalDocument struct {
	ID          uuid.UUID `json:"id" db:"id"`
	Type        string    `json:"type" db:"type"` // 'terms', 'privacy', 'cookies', 'community'
	Name        string    `json:"name" db:"name"`
	Description *string   `json:"description" db:"description"`
	IsMandatory bool      `json:"is_mandatory" db:"is_mandatory"`
	IsActive    bool      `json:"is_active" db:"is_active"`
	SortOrder   int       `json:"sort_order" db:"sort_order"`
	CreatedAt   time.Time `json:"created_at" db:"created_at"`
	UpdatedAt   time.Time `json:"updated_at" db:"updated_at"`
}

// DocumentVersion represents a specific version of a legal document
type DocumentVersion struct {
	ID                 uuid.UUID  `json:"id" db:"id"`
	DocumentID         uuid.UUID  `json:"document_id" db:"document_id"`
	Version            string     `json:"version" db:"version"` // Semver: 1.0.0, 1.1.0
	Language           string     `json:"language" db:"language"` // ISO 639-1: de, en
	Title              string     `json:"title" db:"title"`
	Content            string     `json:"content" db:"content"` // HTML or Markdown
	Summary            *string    `json:"summary" db:"summary"` // Summary of changes
	Status             string     `json:"status" db:"status"`   // 'draft', 'review', 'approved', 'scheduled', 'published', 'archived'
	PublishedAt        *time.Time `json:"published_at" db:"published_at"`
	ScheduledPublishAt *time.Time `json:"scheduled_publish_at" db:"scheduled_publish_at"`
	CreatedBy          *uuid.UUID `json:"created_by" db:"created_by"`
	ApprovedBy         *uuid.UUID `json:"approved_by" db:"approved_by"`
	ApprovedAt         *time.Time `json:"approved_at" db:"approved_at"`
	CreatedAt          time.Time  `json:"created_at" db:"created_at"`
	UpdatedAt          time.Time  `json:"updated_at" db:"updated_at"`
}

// UserConsent represents a user's consent to a document version
type UserConsent struct {
	ID                uuid.UUID  `json:"id" db:"id"`
	UserID            uuid.UUID  `json:"user_id" db:"user_id"`
	DocumentVersionID uuid.UUID  `json:"document_version_id" db:"document_version_id"`
	Consented         bool       `json:"consented" db:"consented"`
	IPAddress         *string    `json:"ip_address" db:"ip_address"`
	UserAgent         *string    `json:"user_agent" db:"user_agent"`
	ConsentedAt       time.Time  `json:"consented_at" db:"consented_at"`
	WithdrawnAt       *time.Time `json:"withdrawn_at" db:"withdrawn_at"`
}

// AuditLog represents an audit trail entry for GDPR compliance
type AuditLog struct {
	ID         uuid.UUID  `json:"id" db:"id"`
	UserID     *uuid.UUID `json:"user_id" db:"user_id"`
	Action     string     `json:"action" db:"action"` // 'consent_given', 'consent_withdrawn', 'data_export', 'data_delete'
	EntityType *string    `json:"entity_type" db:"entity_type"` // 'document', 'cookie_category'
	EntityID   *uuid.UUID `json:"entity_id" db:"entity_id"`
	Details    *string    `json:"details" db:"details"` // JSON string
	IPAddress  *string    `json:"ip_address" db:"ip_address"`
	UserAgent  *string    `json:"user_agent" db:"user_agent"`
	CreatedAt  time.Time  `json:"created_at" db:"created_at"`
}

// DataExportRequest represents a user's request to export their data
type DataExportRequest struct {
	ID          uuid.UUID  `json:"id" db:"id"`
	UserID      uuid.UUID  `json:"user_id" db:"user_id"`
	Status      string     `json:"status" db:"status"` // 'pending', 'processing', 'completed', 'failed'
	DownloadURL *string    `json:"download_url" db:"download_url"`
	ExpiresAt   *time.Time `json:"expires_at" db:"expires_at"`
	CreatedAt   time.Time  `json:"created_at" db:"created_at"`
	CompletedAt *time.Time `json:"completed_at" db:"completed_at"`
}

// DataDeletionRequest represents a user's request to delete their data
type DataDeletionRequest struct {
	ID          uuid.UUID  `json:"id" db:"id"`
	UserID      uuid.UUID  `json:"user_id" db:"user_id"`
	Status      string     `json:"status" db:"status"` // 'pending', 'processing', 'completed', 'failed'
	Reason      *string    `json:"reason" db:"reason"`
	CreatedAt   time.Time  `json:"created_at" db:"created_at"`
	ProcessedAt *time.Time `json:"processed_at" db:"processed_at"`
	ProcessedBy *uuid.UUID `json:"processed_by" db:"processed_by"`
}

// VersionApproval tracks the approval workflow
type VersionApproval struct {
	ID         uuid.UUID `json:"id" db:"id"`
	VersionID  uuid.UUID `json:"version_id" db:"version_id"`
	ApproverID uuid.UUID `json:"approver_id" db:"approver_id"`
	Action     string    `json:"action" db:"action"` // 'submitted_for_review', 'approved', 'rejected', 'published'
	Comment    *string   `json:"comment,omitempty" db:"comment"`
	CreatedAt  time.Time `json:"created_at" db:"created_at"`
}

// ConsentDeadline tracks consent deadlines per user
type ConsentDeadline struct {
	ID                uuid.UUID  `json:"id" db:"id"`
	UserID            uuid.UUID  `json:"user_id" db:"user_id"`
	DocumentVersionID uuid.UUID  `json:"document_version_id" db:"document_version_id"`
	DeadlineAt        time.Time  `json:"deadline_at" db:"deadline_at"`
	ReminderCount     int        `json:"reminder_count" db:"reminder_count"`
	LastReminderAt    *time.Time `json:"last_reminder_at,omitempty" db:"last_reminder_at"`
	ConsentGivenAt    *time.Time `json:"consent_given_at,omitempty" db:"consent_given_at"`
	CreatedAt         time.Time  `json:"created_at" db:"created_at"`
}

// AccountSuspension tracks account suspensions
type AccountSuspension struct {
	ID           uuid.UUID  `json:"id" db:"id"`
	UserID       uuid.UUID  `json:"user_id" db:"user_id"`
	Reason       string     `json:"reason" db:"reason"` // 'consent_deadline_exceeded'
	Details      *string    `json:"details,omitempty" db:"details"` // JSON
	SuspendedAt  time.Time  `json:"suspended_at" db:"suspended_at"`
	LiftedAt     *time.Time `json:"lifted_at,omitempty" db:"lifted_at"`
	LiftedReason *string    `json:"lifted_reason,omitempty" db:"lifted_reason"`
}

// ========================================
// Consent DTOs
// ========================================

// CreateConsentRequest is the request body for creating a consent
type CreateConsentRequest struct {
	DocumentType string `json:"document_type" binding:"required"`
	VersionID    string `json:"version_id" binding:"required"`
	Consented    bool   `json:"consented"`
}

// ConsentCheckResponse is the response for checking consent status
type ConsentCheckResponse struct {
	HasConsent       bool       `json:"has_consent"`
	CurrentVersionID *string    `json:"current_version_id,omitempty"`
	ConsentedVersion *string    `json:"consented_version,omitempty"`
	NeedsUpdate      bool       `json:"needs_update"`
	ConsentedAt      *time.Time `json:"consented_at,omitempty"`
}

// DocumentWithVersion combines document info with its latest published version
type DocumentWithVersion struct {
	Document      LegalDocument    `json:"document"`
	LatestVersion *DocumentVersion `json:"latest_version,omitempty"`
}

// ConsentHistory represents a user's consent history for a document
type ConsentHistory struct {
	Document LegalDocument   `json:"document"`
	Version  DocumentVersion `json:"version"`
	Consent  UserConsent     `json:"consent"`
}

// ConsentStats represents statistics about consents
type ConsentStats struct {
	TotalUsers        int     `json:"total_users"`
	ConsentedUsers    int     `json:"consented_users"`
	ConsentRate       float64 `json:"consent_rate"`
	RecentConsents    int     `json:"recent_consents"` // Last 7 days
	RecentWithdrawals int     `json:"recent_withdrawals"`
}

// MyDataResponse represents all data we have about a user
type MyDataResponse struct {
	User           User             `json:"user"`
	Consents       []ConsentHistory `json:"consents"`
	CookieConsents []CookieConsent  `json:"cookie_consents"`
	AuditLog       []AuditLog       `json:"audit_log"`
	ExportedAt     time.Time        `json:"exported_at"`
}

// CreateDocumentRequest is the request body for creating a document
type CreateDocumentRequest struct {
	Type        string  `json:"type" binding:"required"`
	Name        string  `json:"name" binding:"required"`
	Description *string `json:"description"`
	IsMandatory bool    `json:"is_mandatory"`
}

// CreateVersionRequest is the request body for creating a document version
type CreateVersionRequest struct {
	DocumentID string  `json:"document_id" binding:"required"`
	Version    string  `json:"version" binding:"required"`
	Language   string  `json:"language" binding:"required"`
	Title      string  `json:"title" binding:"required"`
	Content    string  `json:"content" binding:"required"`
	Summary    *string `json:"summary"`
}

// UpdateVersionRequest is the request body for updating a version
type UpdateVersionRequest struct {
	Title   *string `json:"title"`
	Content *string `json:"content"`
	Summary *string `json:"summary"`
	Status  *string `json:"status"`
}

// SubmitForReviewRequest for submitting a version for review
type SubmitForReviewRequest struct {
	Comment *string `json:"comment"`
}

// ApproveVersionRequest for approving a version (DSB)
type ApproveVersionRequest struct {
	Comment            *string `json:"comment"`
	ScheduledPublishAt *string `json:"scheduled_publish_at"` // ISO 8601 datetime for scheduled publishing
}

// RejectVersionRequest for rejecting a version
type RejectVersionRequest struct {
	Comment string `json:"comment" binding:"required"`
}

// VersionCompareResponse for comparing versions
type VersionCompareResponse struct {
	Published *DocumentVersion  `json:"published,omitempty"`
	Draft     *DocumentVersion  `json:"draft"`
	Diff      *string           `json:"diff,omitempty"`
	Approvals []VersionApproval `json:"approvals"`
}

// PendingConsentResponse for pending consents with deadline info
type PendingConsentResponse struct {
	Document   LegalDocument   `json:"document"`
	Version    DocumentVersion `json:"version"`
	DeadlineAt time.Time       `json:"deadline_at"`
	DaysLeft   int             `json:"days_left"`
	IsOverdue  bool            `json:"is_overdue"`
}

// AccountStatusResponse for account status check
type AccountStatusResponse struct {
	Status           string                   `json:"status"` // 'active', 'suspended'
	PendingConsents  []PendingConsentResponse `json:"pending_consents,omitempty"`
	SuspensionReason *string                  `json:"suspension_reason,omitempty"`
	CanAccess        bool                     `json:"can_access"`
}