package dtos

import (
	"fmt"
	"strings"

	"knowfoolery/backend/shared/types"
	"knowfoolery/backend/shared/errors"
	"knowfoolery/backend/services/game-session-service/internal/domain/valueobjects"
)

// Request DTOs

// StartSessionRequest represents a request to start a new session
type StartSessionRequest struct {
	UserID     types.UserID `json:"user_id" validate:"required"`
	PlayerName string       `json:"player_name,omitempty" validate:"omitempty,min=2,max=50"`
}

// Validate validates the start session request
func (r *StartSessionRequest) Validate() error {
	if r.UserID.IsEmpty() {
		return errors.ErrValidationFailed("user_id", "user ID is required")
	}

	if r.PlayerName != "" {
		playerName := strings.TrimSpace(r.PlayerName)
		if len(playerName) < 2 {
			return errors.ErrValidationFailed("player_name", "player name must be at least 2 characters")
		}
		if len(playerName) > 50 {
			return errors.ErrValidationFailed("player_name", "player name must be at most 50 characters")
		}
	}

	return nil
}

// ResumeSessionRequest represents a request to resume a session
type ResumeSessionRequest struct {
	SessionID types.GameSessionID `json:"session_id" validate:"required"`
}

// Validate validates the resume session request
func (r *ResumeSessionRequest) Validate() error {
	if r.SessionID.IsEmpty() {
		return errors.ErrValidationFailed("session_id", "session ID is required")
	}
	return nil
}

// SubmitAnswerRequest represents a request to submit an answer
type SubmitAnswerRequest struct {
	SessionID    types.GameSessionID `json:"session_id" validate:"required"`
	QuestionID   types.QuestionID    `json:"question_id" validate:"required"`
	PlayerAnswer string              `json:"player_answer" validate:"required,max=500"`
	HintUsed     bool                `json:"hint_used"`
}

// Validate validates the submit answer request
func (r *SubmitAnswerRequest) Validate() error {
	if r.SessionID.IsEmpty() {
		return errors.ErrValidationFailed("session_id", "session ID is required")
	}

	if r.QuestionID.IsEmpty() {
		return errors.ErrValidationFailed("question_id", "question ID is required")
	}

	playerAnswer := strings.TrimSpace(r.PlayerAnswer)
	if playerAnswer == "" {
		return errors.ErrValidationFailed("player_answer", "player answer is required")
	}

	if len(playerAnswer) > types.MaxAnswerLength {
		return errors.ErrValidationFailed("player_answer", 
			fmt.Sprintf("player answer must be at most %d characters", types.MaxAnswerLength))
	}

	return nil
}

// RequestHintRequest represents a request for a hint
type RequestHintRequest struct {
	SessionID  types.GameSessionID `json:"session_id" validate:"required"`
	QuestionID types.QuestionID    `json:"question_id" validate:"required"`
}

// Validate validates the request hint request
func (r *RequestHintRequest) Validate() error {
	if r.SessionID.IsEmpty() {
		return errors.ErrValidationFailed("session_id", "session ID is required")
	}

	if r.QuestionID.IsEmpty() {
		return errors.ErrValidationFailed("question_id", "question ID is required")
	}

	return nil
}

// CompleteSessionRequest represents a request to complete a session
type CompleteSessionRequest struct {
	SessionID types.GameSessionID `json:"session_id" validate:"required"`
	Reason    string              `json:"reason" validate:"required,max=100"`
}

// Validate validates the complete session request
func (r *CompleteSessionRequest) Validate() error {
	if r.SessionID.IsEmpty() {
		return errors.ErrValidationFailed("session_id", "session ID is required")
	}

	reason := strings.TrimSpace(r.Reason)
	if reason == "" {
		return errors.ErrValidationFailed("reason", "completion reason is required")
	}

	if len(reason) > 100 {
		return errors.ErrValidationFailed("reason", "completion reason must be at most 100 characters")
	}

	return nil
}

// AbandonSessionRequest represents a request to abandon a session
type AbandonSessionRequest struct {
	SessionID types.GameSessionID `json:"session_id" validate:"required"`
}

// Validate validates the abandon session request
func (r *AbandonSessionRequest) Validate() error {
	if r.SessionID.IsEmpty() {
		return errors.ErrValidationFailed("session_id", "session ID is required")
	}
	return nil
}

// GetSessionStatusRequest represents a request to get session status
type GetSessionStatusRequest struct {
	SessionID types.GameSessionID `json:"session_id" validate:"required"`
}

// Validate validates the get session status request
func (r *GetSessionStatusRequest) Validate() error {
	if r.SessionID.IsEmpty() {
		return errors.ErrValidationFailed("session_id", "session ID is required")
	}
	return nil
}

// GetUserSessionsRequest represents a request to get user sessions
type GetUserSessionsRequest struct {
	UserID types.UserID `json:"user_id" validate:"required"`
	Limit  int          `json:"limit" validate:"min=1,max=100"`
	Offset int          `json:"offset" validate:"min=0"`
}

// Validate validates the get user sessions request
func (r *GetUserSessionsRequest) Validate() error {
	if r.UserID.IsEmpty() {
		return errors.ErrValidationFailed("user_id", "user ID is required")
	}

	if r.Limit <= 0 {
		r.Limit = 20 // Default limit
	}
	if r.Limit > 100 {
		return errors.ErrValidationFailed("limit", "limit must be at most 100")
	}

	if r.Offset < 0 {
		return errors.ErrValidationFailed("offset", "offset must be non-negative")
	}

	return nil
}

// GetActiveSessionRequest represents a request to get active session
type GetActiveSessionRequest struct {
	UserID types.UserID `json:"user_id" validate:"required"`
}

// Validate validates the get active session request
func (r *GetActiveSessionRequest) Validate() error {
	if r.UserID.IsEmpty() {
		return errors.ErrValidationFailed("user_id", "user ID is required")
	}
	return nil
}

// Response DTOs

// StartSessionResponse represents the response to starting a session
type StartSessionResponse struct {
	SessionID     types.GameSessionID `json:"session_id"`
	Status        string              `json:"status"`
	CreatedAt     types.Timestamp     `json:"created_at"`
	PlayerName    string              `json:"player_name,omitempty"`
	MaxDuration   types.Duration      `json:"max_duration"`
	RemainingTime types.Duration      `json:"remaining_time"`
}

// ResumeSessionResponse represents the response to resuming a session
type ResumeSessionResponse struct {
	SessionID         types.GameSessionID               `json:"session_id"`
	CanResume         bool                              `json:"can_resume"`
	TimeoutOccurred   bool                              `json:"timeout_occurred"`
	Status            string                            `json:"status"`
	RemainingTime     *types.Duration                   `json:"remaining_time,omitempty"`
	CurrentScore      *ScoreDTO                         `json:"current_score,omitempty"`
	QuestionsProgress map[string]QuestionProgressDTO    `json:"questions_progress,omitempty"`
	CompletionResult  *SessionCompletionResultDTO       `json:"completion_result,omitempty"`
}

// SubmitAnswerResponse represents the response to submitting an answer
type SubmitAnswerResponse struct {
	Accepted             bool                        `json:"accepted"`
	ProcessingResult     *AnswerProcessingResult     `json:"processing_result,omitempty"`
	AntiCheatViolations  []string                    `json:"anti_cheat_violations,omitempty"`
	UpdatedScore         *ScoreDTO                   `json:"updated_score,omitempty"`
	RemainingTime        types.Duration              `json:"remaining_time"`
	TimeoutOccurred      bool                        `json:"timeout_occurred"`
	CompletionResult     *SessionCompletionResultDTO `json:"completion_result,omitempty"`
	RejectionReason      *string                     `json:"rejection_reason,omitempty"`
}

// RequestHintResponse represents the response to requesting a hint
type RequestHintResponse struct {
	HintText    string              `json:"hint_text"`
	QuestionID  types.QuestionID    `json:"question_id"`
	RequestedAt types.Timestamp     `json:"requested_at"`
}

// CompleteSessionResponse represents the response to completing a session
type CompleteSessionResponse struct {
	SessionID        types.GameSessionID         `json:"session_id"`
	FinalScore       int                         `json:"final_score"`
	CompletedAt      types.Timestamp             `json:"completed_at"`
	Reason           string                      `json:"reason"`
	Duration         types.Duration              `json:"duration"`
	CompletionResult *SessionCompletionResultDTO `json:"completion_result"`
}

// AbandonSessionResponse represents the response to abandoning a session
type AbandonSessionResponse struct {
	SessionID   types.GameSessionID `json:"session_id"`
	AbandonedAt types.Timestamp     `json:"abandoned_at"`
	FinalScore  int                 `json:"final_score"`
}

// GetSessionStatusResponse represents the response to getting session status
type GetSessionStatusResponse struct {
	SessionID         types.GameSessionID               `json:"session_id"`
	Status            string                            `json:"status"`
	CurrentScore      *ScoreDTO                         `json:"current_score"`
	TimerStatus       *TimerStatusDTO                   `json:"timer_status"`
	QuestionsProgress map[string]QuestionProgressDTO    `json:"questions_progress"`
	TimeoutOccurred   bool                              `json:"timeout_occurred"`
	CompletionResult  *SessionCompletionResultDTO       `json:"completion_result,omitempty"`
}

// GetUserSessionsResponse represents the response to getting user sessions
type GetUserSessionsResponse struct {
	Sessions   []SessionSummary `json:"sessions"`
	TotalCount int              `json:"total_count"`
	Offset     int              `json:"offset"`
	Limit      int              `json:"limit"`
}

// GetActiveSessionResponse represents the response to getting active session
type GetActiveSessionResponse struct {
	HasActiveSession  bool                           `json:"has_active_session"`
	SessionID         types.GameSessionID            `json:"session_id,omitempty"`
	Status            string                         `json:"status,omitempty"`
	CreatedAt         types.Timestamp                `json:"created_at,omitempty"`
	PlayerName        *string                        `json:"player_name,omitempty"`
	CurrentScore      *ScoreDTO                      `json:"current_score,omitempty"`
	RemainingTime     types.Duration                 `json:"remaining_time,omitempty"`
	QuestionsProgress map[string]QuestionProgressDTO `json:"questions_progress,omitempty"`
}

// Nested DTOs

// ScoreDTO represents score information
type ScoreDTO struct {
	Total                    int     `json:"total"`
	QuestionsAttempted       int     `json:"questions_attempted"`
	QuestionsCorrect         int     `json:"questions_correct"`
	SuccessRate              float64 `json:"success_rate"`
	PointsFromHints          int     `json:"points_from_hints"`
	PointsWithoutHints       int     `json:"points_without_hints"`
	HintsUsed                int     `json:"hints_used"`
	AveragePointsPerQuestion float64 `json:"average_points_per_question"`
}

// TimerStatusDTO represents timer status information
type TimerStatusDTO struct {
	IsActive            bool                          `json:"is_active"`
	IsExpired           bool                          `json:"is_expired"`
	IsInWarningPeriod   bool                          `json:"is_in_warning_period"`
	IsInCriticalPeriod  bool                          `json:"is_in_critical_period"`
	StartTime           types.Timestamp               `json:"start_time"`
	EndTime             *types.Timestamp              `json:"end_time,omitempty"`
	ElapsedTime         types.Duration                `json:"elapsed_time"`
	RemainingTime       types.Duration                `json:"remaining_time"`
	ElapsedFormatted    string                        `json:"elapsed_formatted"`
	RemainingFormatted  string                        `json:"remaining_formatted"`
	ElapsedPercentage   float64                       `json:"elapsed_percentage"`
	RemainingPercentage float64                       `json:"remaining_percentage"`
	WarningsSent        []valueobjects.TimerWarning   `json:"warnings_sent"`
}

// QuestionProgressDTO represents progress on a single question
type QuestionProgressDTO struct {
	QuestionID  types.QuestionID  `json:"question_id"`
	PresentedAt types.Timestamp   `json:"presented_at"`
	HintUsed    bool              `json:"hint_used"`
	IsCompleted bool              `json:"is_completed"`
	Attempts    []AttemptDTO      `json:"attempts"`
}

// AttemptDTO represents a single attempt
type AttemptDTO struct {
	ID            types.AttemptID `json:"id"`
	AttemptNumber int             `json:"attempt_number"`
	PlayerAnswer  string          `json:"player_answer"`
	IsCorrect     bool            `json:"is_correct"`
	IsTimeout     bool            `json:"is_timeout"`
	PointsAwarded int             `json:"points_awarded"`
	HintUsed      bool            `json:"hint_used"`
	MatchType     string          `json:"match_type"`
	Similarity    float64         `json:"similarity"`
	AttemptedAt   types.Timestamp `json:"attempted_at"`
}

// AnswerProcessingResult represents the result of processing an answer
type AnswerProcessingResult struct {
	IsCorrect          bool    `json:"is_correct"`
	Score              int     `json:"score"`
	AttemptNumber      int     `json:"attempt_number"`
	AttemptsRemaining  int     `json:"attempts_remaining"`
	Similarity         float64 `json:"similarity"`
	MatchType          string  `json:"match_type"`
	IsQuestionComplete bool    `json:"is_question_complete"`
}

// SessionCompletionResultDTO represents the result of session completion
type SessionCompletionResultDTO struct {
	SessionID   types.GameSessionID `json:"session_id"`
	FinalScore  int                 `json:"final_score"`
	CompletedAt types.Timestamp     `json:"completed_at"`
	Reason      string              `json:"reason"`
	Duration    types.Duration      `json:"duration"`
}

// SessionSummary represents a summary of a session
type SessionSummary struct {
	SessionID      types.GameSessionID `json:"session_id"`
	Status         string              `json:"status"`
	CreatedAt      types.Timestamp     `json:"created_at"`
	UpdatedAt      types.Timestamp     `json:"updated_at"`
	Duration       types.Duration      `json:"duration"`
	PlayerName     *string             `json:"player_name,omitempty"`
	Score          *ScoreDTO           `json:"score"`
	QuestionsCount int                 `json:"questions_count"`
}

// Helper methods for DTOs

// GetScoreSummary returns a human-readable score summary
func (s *ScoreDTO) GetScoreSummary() string {
	return fmt.Sprintf("%d points (%d/%d correct, %.1f%% success rate)",
		s.Total, s.QuestionsCorrect, s.QuestionsAttempted, s.SuccessRate)
}

// GetTimerSummary returns a human-readable timer summary
func (t *TimerStatusDTO) GetTimerSummary() string {
	if !t.IsActive {
		return fmt.Sprintf("Inactive (Duration: %s)", t.ElapsedFormatted)
	}

	if t.IsExpired {
		return "Session expired"
	}

	status := "Active"
	if t.IsInCriticalPeriod {
		status = "Critical"
	} else if t.IsInWarningPeriod {
		status = "Warning"
	}

	return fmt.Sprintf("%s (%s remaining)", status, t.RemainingFormatted)
}

// GetProgressSummary returns a summary of question progress
func (q *QuestionProgressDTO) GetProgressSummary() string {
	if q.IsCompleted {
		return fmt.Sprintf("Completed (%d attempts)", len(q.Attempts))
	}
	return fmt.Sprintf("In progress (%d attempts)", len(q.Attempts))
}

// GetAttemptSummary returns a summary of an attempt
func (a *AttemptDTO) GetAttemptSummary() string {
	status := "incorrect"
	if a.IsTimeout {
		status = "timeout"
	} else if a.IsCorrect {
		status = "correct"
	}

	return fmt.Sprintf("Attempt %d: %s (%d points)", 
		a.AttemptNumber, status, a.PointsAwarded)
}

// GetSessionSummary returns a summary of the session
func (s *SessionSummary) GetSessionSummary() string {
	playerInfo := ""
	if s.PlayerName != nil {
		playerInfo = fmt.Sprintf(" - %s", *s.PlayerName)
	}

	return fmt.Sprintf("Session %s: %s%s (%s, %d questions)",
		s.SessionID, s.Status, playerInfo, s.Duration.String(), s.QuestionsCount)
}

// IsSuccessful returns true if the answer processing was successful
func (apr *AnswerProcessingResult) IsSuccessful() bool {
	return apr.IsCorrect && apr.Score > 0
}

// GetCompletionSummary returns a summary of the completion result
func (scr *SessionCompletionResultDTO) GetCompletionSummary() string {
	return fmt.Sprintf("Session completed: %d points in %s (reason: %s)",
		scr.FinalScore, scr.Duration.String(), scr.Reason)
}