package workshop

import (
	"time"

	"github.com/google/uuid"
)

// ============================================================================
// Constants / Enums
// ============================================================================

// SessionStatus represents the status of a workshop session
type SessionStatus string

const (
	SessionStatusDraft      SessionStatus = "DRAFT"
	SessionStatusScheduled  SessionStatus = "SCHEDULED"
	SessionStatusActive     SessionStatus = "ACTIVE"
	SessionStatusPaused     SessionStatus = "PAUSED"
	SessionStatusCompleted  SessionStatus = "COMPLETED"
	SessionStatusCancelled  SessionStatus = "CANCELLED"
)

// ParticipantRole represents the role of a participant
type ParticipantRole string

const (
	ParticipantRoleFacilitator ParticipantRole = "FACILITATOR"
	ParticipantRoleExpert      ParticipantRole = "EXPERT"      // DSB, IT-Security, etc.
	ParticipantRoleStakeholder ParticipantRole = "STAKEHOLDER" // Business owner
	ParticipantRoleObserver    ParticipantRole = "OBSERVER"
)

// ResponseStatus represents the status of a question response
type ResponseStatus string

const (
	ResponseStatusPending   ResponseStatus = "PENDING"
	ResponseStatusDraft     ResponseStatus = "DRAFT"
	ResponseStatusSubmitted ResponseStatus = "SUBMITTED"
	ResponseStatusReviewed  ResponseStatus = "REVIEWED"
)

// ============================================================================
// Main Entities
// ============================================================================

// Session represents a workshop session
type Session struct {
	ID          uuid.UUID     `json:"id"`
	TenantID    uuid.UUID     `json:"tenant_id"`
	NamespaceID *uuid.UUID    `json:"namespace_id,omitempty"`

	// Session info
	Title        string        `json:"title"`
	Description  string        `json:"description,omitempty"`
	SessionType  string        `json:"session_type"` // "ucca", "dsfa", "custom"
	Status       SessionStatus `json:"status"`

	// Wizard configuration
	WizardSchema string `json:"wizard_schema,omitempty"` // Reference to wizard schema version
	CurrentStep  int    `json:"current_step"`
	TotalSteps   int    `json:"total_steps"`

	// Linked entities
	AssessmentID *uuid.UUID `json:"assessment_id,omitempty"` // Link to UCCA assessment
	RoadmapID    *uuid.UUID `json:"roadmap_id,omitempty"`    // Link to roadmap
	PortfolioID  *uuid.UUID `json:"portfolio_id,omitempty"`  // Link to portfolio

	// Scheduling
	ScheduledStart *time.Time `json:"scheduled_start,omitempty"`
	ScheduledEnd   *time.Time `json:"scheduled_end,omitempty"`
	ActualStart    *time.Time `json:"actual_start,omitempty"`
	ActualEnd      *time.Time `json:"actual_end,omitempty"`

	// Access control
	JoinCode     string `json:"join_code,omitempty"`      // Code for participants to join
	RequireAuth  bool   `json:"require_auth"`             // Require authentication to join
	AllowAnonymous bool `json:"allow_anonymous"`          // Allow anonymous participation

	// Settings
	Settings SessionSettings `json:"settings"`

	// Audit
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
	CreatedBy uuid.UUID `json:"created_by"`
}

// SessionSettings contains session configuration
type SessionSettings struct {
	AllowBackNavigation  bool `json:"allow_back_navigation"`  // Can go back to previous steps
	RequireAllResponses  bool `json:"require_all_responses"`  // All questions must be answered
	ShowProgressToAll    bool `json:"show_progress_to_all"`   // Show progress to all participants
	AllowNotes           bool `json:"allow_notes"`            // Allow adding notes
	AutoSave             bool `json:"auto_save"`              // Auto-save responses
	TimeoutMinutes       int  `json:"timeout_minutes,omitempty"` // Auto-pause after inactivity
}

// Participant represents a participant in a session
type Participant struct {
	ID        uuid.UUID       `json:"id"`
	SessionID uuid.UUID       `json:"session_id"`
	UserID    *uuid.UUID      `json:"user_id,omitempty"` // Nil for anonymous

	// Info
	Name         string          `json:"name"`
	Email        string          `json:"email,omitempty"`
	Role         ParticipantRole `json:"role"`
	Department   string          `json:"department,omitempty"`

	// Status
	IsActive     bool       `json:"is_active"`
	LastActiveAt *time.Time `json:"last_active_at,omitempty"`
	JoinedAt     time.Time  `json:"joined_at"`
	LeftAt       *time.Time `json:"left_at,omitempty"`

	// Permissions
	CanEdit      bool `json:"can_edit"`      // Can modify responses
	CanComment   bool `json:"can_comment"`   // Can add comments
	CanApprove   bool `json:"can_approve"`   // Can approve responses
}

// StepProgress tracks progress on a specific wizard step
type StepProgress struct {
	ID        uuid.UUID `json:"id"`
	SessionID uuid.UUID `json:"session_id"`
	StepNumber int      `json:"step_number"`

	// Status
	Status     string `json:"status"` // "pending", "in_progress", "completed", "skipped"
	Progress   int    `json:"progress"` // 0-100

	// Timestamps
	StartedAt   *time.Time `json:"started_at,omitempty"`
	CompletedAt *time.Time `json:"completed_at,omitempty"`

	// Facilitator notes
	Notes string `json:"notes,omitempty"`
}

// Response represents a response to a wizard question
type Response struct {
	ID            uuid.UUID      `json:"id"`
	SessionID     uuid.UUID      `json:"session_id"`
	ParticipantID uuid.UUID      `json:"participant_id"`

	// Question reference
	StepNumber  int    `json:"step_number"`
	FieldID     string `json:"field_id"`      // From wizard schema

	// Response data
	Value       interface{}    `json:"value"`          // Can be string, bool, array, etc.
	ValueType   string         `json:"value_type"`     // "string", "boolean", "array", "number"

	// Status
	Status      ResponseStatus `json:"status"`

	// Review
	ReviewedBy  *uuid.UUID `json:"reviewed_by,omitempty"`
	ReviewedAt  *time.Time `json:"reviewed_at,omitempty"`
	ReviewNotes string     `json:"review_notes,omitempty"`

	// Audit
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
}

// Comment represents a comment on a response or step
type Comment struct {
	ID            uuid.UUID `json:"id"`
	SessionID     uuid.UUID `json:"session_id"`
	ParticipantID uuid.UUID `json:"participant_id"`

	// Target
	StepNumber  *int       `json:"step_number,omitempty"`
	FieldID     *string    `json:"field_id,omitempty"`
	ResponseID  *uuid.UUID `json:"response_id,omitempty"`

	// Content
	Text        string `json:"text"`
	IsResolved  bool   `json:"is_resolved"`

	// Audit
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
}

// SessionSummary contains aggregated session information
type SessionSummary struct {
	Session       *Session       `json:"session"`
	Participants  []Participant  `json:"participants"`
	StepProgress  []StepProgress `json:"step_progress"`
	TotalResponses int           `json:"total_responses"`
	CompletedSteps int           `json:"completed_steps"`
	OverallProgress int          `json:"overall_progress"` // 0-100
}

// ============================================================================
// API Request/Response Types
// ============================================================================

// CreateSessionRequest is the API request for creating a session
type CreateSessionRequest struct {
	Title          string          `json:"title"`
	Description    string          `json:"description,omitempty"`
	SessionType    string          `json:"session_type"`
	WizardSchema   string          `json:"wizard_schema,omitempty"`
	ScheduledStart *time.Time      `json:"scheduled_start,omitempty"`
	ScheduledEnd   *time.Time      `json:"scheduled_end,omitempty"`
	Settings       SessionSettings `json:"settings,omitempty"`
	AssessmentID   *uuid.UUID      `json:"assessment_id,omitempty"`
	RoadmapID      *uuid.UUID      `json:"roadmap_id,omitempty"`
	PortfolioID    *uuid.UUID      `json:"portfolio_id,omitempty"`
}

// CreateSessionResponse is the API response for creating a session
type CreateSessionResponse struct {
	Session  Session `json:"session"`
	JoinURL  string  `json:"join_url,omitempty"`
	JoinCode string  `json:"join_code,omitempty"`
}

// JoinSessionRequest is the API request for joining a session
type JoinSessionRequest struct {
	Name       string          `json:"name"`
	Email      string          `json:"email,omitempty"`
	Role       ParticipantRole `json:"role,omitempty"`
	Department string          `json:"department,omitempty"`
}

// JoinSessionResponse is the API response for joining a session
type JoinSessionResponse struct {
	Participant Participant `json:"participant"`
	Session     Session     `json:"session"`
	Token       string      `json:"token,omitempty"` // Session-specific token
}

// SubmitResponseRequest is the API request for submitting a response
type SubmitResponseRequest struct {
	StepNumber int         `json:"step_number"`
	FieldID    string      `json:"field_id"`
	Value      interface{} `json:"value"`
}

// AdvanceStepRequest is the API request for advancing to next step
type AdvanceStepRequest struct {
	Responses []SubmitResponseRequest `json:"responses,omitempty"` // Optional batch submit
	Notes     string                  `json:"notes,omitempty"`
}

// SessionFilters defines filters for listing sessions
type SessionFilters struct {
	Status       SessionStatus
	SessionType  string
	AssessmentID *uuid.UUID
	CreatedBy    *uuid.UUID
	Limit        int
	Offset       int
}

// SessionStats contains statistics for a session
type SessionStats struct {
	ParticipantCount    int            `json:"participant_count"`
	ActiveParticipants  int            `json:"active_participants"`
	ResponseCount       int            `json:"response_count"`
	CommentCount        int            `json:"comment_count"`
	CompletedSteps      int            `json:"completed_steps"`
	TotalSteps          int            `json:"total_steps"`
	AverageProgress     int            `json:"average_progress"`
	ResponsesByStep     map[int]int    `json:"responses_by_step"`
	ResponsesByField    map[string]int `json:"responses_by_field"`
}

// ExportFormat specifies the export format for session data
type ExportFormat string

const (
	ExportFormatJSON     ExportFormat = "json"
	ExportFormatMarkdown ExportFormat = "md"
	ExportFormatPDF      ExportFormat = "pdf"
)

// ExportSessionRequest is the API request for exporting session data
type ExportSessionRequest struct {
	Format          ExportFormat `json:"format"`
	IncludeComments bool         `json:"include_comments"`
	IncludeHistory  bool         `json:"include_history"`
}