// Package ast defines AST structures for all Mermaid diagram types
package ast

// SequenceDiagram represents a sequence diagram
// Based on sequenceDiagram.jison and sequenceDb.ts
type SequenceDiagram struct {
	Participants []*SequenceParticipant `json:"participants"`
	Messages     []*SequenceMessage     `json:"messages"`
	Loops        []*SequenceLoop        `json:"loops"`
	Alts         []*SequenceAlt         `json:"alts"`
	Opts         []*SequenceOpt         `json:"opts"`
	Pars         []*SequencePar         `json:"pars"`
	Notes        []*SequenceNote        `json:"notes"`
	Boxes        []*SequenceBox         `json:"boxes"`
	Rects        []*SequenceRect        `json:"rects,omitempty"`
	Criticals    []*SequenceCritical    `json:"criticals,omitempty"`
	Breaks       []*SequenceBreak       `json:"breaks,omitempty"`
	Activations  []*SequenceActivation  `json:"activations"`
	Title        *string                `json:"title,omitempty"`
	Config       map[string]any         `json:"config,omitempty"`
}

type SequenceParticipant struct {
	ID          string          `json:"id"`
	Name        string          `json:"name"`
	Type        ParticipantType `json:"type"`
	Alias       *string         `json:"alias,omitempty"`
	Description *string         `json:"description,omitempty"`
	Config      map[string]any  `json:"config,omitempty"`
}

type ParticipantType string

const (
	ParticipantTypeParticipant ParticipantType = "participant"
	ParticipantTypeActor       ParticipantType = "actor"
)

type SequenceMessage struct {
	From       string              `json:"from"`
	To         string              `json:"to"`
	Message    string              `json:"message"`
	Type       SequenceMessageType `json:"type"`
	Activate   bool                `json:"activate,omitempty"`
	Deactivate bool                `json:"deactivate,omitempty"`
	Note       *string             `json:"note,omitempty"`
}

type SequenceMessageType string

const (
	MessageTypeSolid         SequenceMessageType = "->"
	MessageTypeDotted        SequenceMessageType = "-->"
	MessageTypeSolidCross    SequenceMessageType = "-x"
	MessageTypeDottedCross   SequenceMessageType = "--x"
	MessageTypeSolidOpen     SequenceMessageType = "-)"
	MessageTypeDottedOpen    SequenceMessageType = "--)"
	MessageTypeBidirectional SequenceMessageType = "<->"
)

type SequenceLoop struct {
	Label     string             `json:"label"`
	Messages  []*SequenceMessage `json:"messages"`
	StartLine int                `json:"startLine"`
	EndLine   int                `json:"endLine"`
}

type SequenceAlt struct {
	Label        string             `json:"label"`
	IfMessages   []*SequenceMessage `json:"ifMessages"`
	ElseMessages []*SequenceMessage `json:"elseMessages,omitempty"`
	StartLine    int                `json:"startLine"`
	EndLine      int                `json:"endLine"`
}

type SequenceOpt struct {
	Label     string             `json:"label"`
	Messages  []*SequenceMessage `json:"messages"`
	StartLine int                `json:"startLine"`
	EndLine   int                `json:"endLine"`
}

type SequencePar struct {
	Sections  []SequenceParSection `json:"sections"`
	StartLine int                  `json:"startLine"`
	EndLine   int                  `json:"endLine"`
}

type SequenceParSection struct {
	Label    *string            `json:"label,omitempty"`
	Messages []*SequenceMessage `json:"messages"`
}

type SequenceNote struct {
	Actor     string    `json:"actor"`
	Placement NotePlace `json:"placement"`
	Message   string    `json:"message"`
}

type NotePlace string

const (
	NotePlaceLeft  NotePlace = "left of"
	NotePlaceRight NotePlace = "right of"
	NotePlaceOver  NotePlace = "over"
)

type SequenceBox struct {
	Name         string   `json:"name"`
	Color        *string  `json:"color,omitempty"`
	Participants []string `json:"participants"`
}

type SequenceActivation struct {
	Actor string         `json:"actor"`
	Type  ActivationType `json:"type"`
}

type ActivationType string

const (
	ActivationTypeActivate   ActivationType = "activate"
	ActivationTypeDeactivate ActivationType = "deactivate"
)

type SequenceRect struct {
	Color    *string            `json:"color,omitempty"`
	Messages []*SequenceMessage `json:"messages"`
}

type SequenceCritical struct {
	Label    string             `json:"label"`
	Options  []*SequenceOption  `json:"options"`
	Messages []*SequenceMessage `json:"messages"`
}

type SequenceOption struct {
	Label    string             `json:"label"`
	Messages []*SequenceMessage `json:"messages"`
}

type SequenceBreak struct {
	Label    string             `json:"label"`
	Messages []*SequenceMessage `json:"messages"`
}

// Type returns the diagram type
func (s *SequenceDiagram) Type() DiagramType {
	return DiagramTypeSequence
}

// Validate checks if the sequence diagram is valid
func (s *SequenceDiagram) Validate() error {
	participantMap := make(map[string]bool)
	for _, p := range s.Participants {
		participantMap[p.ID] = true
	}

	// Validate messages reference valid participants
	for _, msg := range s.Messages {
		if !participantMap[msg.From] {
			return NewValidationError("message references non-existent participant: " + msg.From)
		}
		if !participantMap[msg.To] {
			return NewValidationError("message references non-existent participant: " + msg.To)
		}
	}

	return nil
}

// NewSequenceDiagram creates a new sequence diagram
func NewSequenceDiagram() *SequenceDiagram {
	return &SequenceDiagram{
		Participants: make([]*SequenceParticipant, 0),
		Messages:     make([]*SequenceMessage, 0),
		Loops:        make([]*SequenceLoop, 0),
		Alts:         make([]*SequenceAlt, 0),
		Opts:         make([]*SequenceOpt, 0),
		Pars:         make([]*SequencePar, 0),
		Notes:        make([]*SequenceNote, 0),
		Boxes:        make([]*SequenceBox, 0),
		Rects:        make([]*SequenceRect, 0),
		Criticals:    make([]*SequenceCritical, 0),
		Breaks:       make([]*SequenceBreak, 0),
		Activations:  make([]*SequenceActivation, 0),
		Config:       make(map[string]any),
	}
}