package models

import (
	"encoding/json"
	"time"
)

// ── Workflow ────────────────────────────────

// Workflow is a team-owned or global staged process definition.
type Workflow struct {
	ID          string          `json:"id"`
	TeamID      *string         `json:"team_id,omitempty"`
	Name        string          `json:"name"`
	Slug        string          `json:"slug"`
	Description string          `json:"description"`
	Branding    json.RawMessage `json:"branding"`
	EntryMode   string          `json:"entry_mode"` // public_link | team_only
	IsActive    bool            `json:"is_active"`
	Version     int             `json:"version"`
	OnComplete    json.RawMessage `json:"on_complete,omitempty"`
	Retention     json.RawMessage `json:"retention"`
	WebhookURL              string          `json:"webhook_url,omitempty"`
	WebhookSecret           string          `json:"webhook_secret,omitempty"`
	StalenessTimeoutHours   *int            `json:"staleness_timeout_hours,omitempty"`
	CreatedBy               string          `json:"created_by"`
	CreatedAt   time.Time       `json:"created_at"`
	UpdatedAt   time.Time       `json:"updated_at"`

	// Joined data (not stored directly)
	Stages []WorkflowStage `json:"stages,omitempty"`
}

// WorkflowPatch contains optional fields for updating a workflow.
type WorkflowPatch struct {
	Name        *string          `json:"name,omitempty"`
	Description *string          `json:"description,omitempty"`
	TeamID      *string          `json:"team_id,omitempty"`
	Branding    *json.RawMessage `json:"branding,omitempty"`
	EntryMode   *string          `json:"entry_mode,omitempty"`
	IsActive    *bool            `json:"is_active,omitempty"`
	OnComplete  *json.RawMessage `json:"on_complete,omitempty"`
	Retention   *json.RawMessage `json:"retention,omitempty"`
	WebhookURL              *string          `json:"webhook_url,omitempty"`
	WebhookSecret           *string          `json:"webhook_secret,omitempty"`
	StalenessTimeoutHours   *int             `json:"staleness_timeout_hours,omitempty"`
}

// ── Workflow Stage ──────────────────────────

// WorkflowStage is an ordered step within a workflow definition.
type WorkflowStage struct {
	ID               string          `json:"id"`
	WorkflowID       string          `json:"workflow_id"`
	Ordinal          int             `json:"ordinal"`
	Name             string          `json:"name"`
	AssignmentTeamID *string         `json:"assignment_team_id,omitempty"`
	FormTemplate     json.RawMessage `json:"form_template"`
	StageMode        string          `json:"stage_mode"`  // form | delegated | automated
	Audience         string          `json:"audience"`    // team | public | system
	StageType        string          `json:"stage_type"`  // deprecated — retained for backward compatibility
	AutoTransition   bool            `json:"auto_transition"`
	StageConfig      json.RawMessage `json:"stage_config"`
	BranchRules      json.RawMessage `json:"branch_rules"`
	StarlarkHook     *string         `json:"starlark_hook,omitempty"`
	SurfacePkgID     *string         `json:"surface_pkg_id,omitempty"`
	SLASeconds       *int            `json:"sla_seconds,omitempty"`
	CreatedAt        time.Time       `json:"created_at"`
}

// ── Stage Mode Constants ────────────────────

const (
	StageModeForm      = "form"
	StageModeDelegated = "delegated"
	StageModeAutomated = "automated"
)

// ValidStageModes is the set of valid stage_mode values.
var ValidStageModes = map[string]bool{
	StageModeForm:      true,
	StageModeDelegated: true,
	StageModeAutomated: true,
}

// NormalizeStageModeInput maps deprecated stage_mode values to their
// replacements. "review" → "form"; all others pass through unchanged.
func NormalizeStageModeInput(mode string) string {
	if mode == "review" {
		return StageModeForm
	}
	return mode
}

// ── Stage Type Constants (deprecated) ───────
// stage_type is redundant with starlark_hook presence and is no longer
// validated. Constants are retained for backward-compatible references.

const (
	StageTypeSimple    = "simple"
	StageTypeDynamic   = "dynamic"
	StageTypeAutomated = "automated"
)

// ── Audience Constants ──────────────────────

const (
	AudienceTeam   = "team"
	AudiencePublic = "public"
	AudienceSystem = "system"
)

// ValidAudiences is the set of valid audience values.
var ValidAudiences = map[string]bool{
	AudienceTeam:   true,
	AudiencePublic: true,
	AudienceSystem: true,
}

// ── Instance Status Constants ───────────────

const (
	InstanceStatusActive    = "active"
	InstanceStatusCompleted = "completed"
	InstanceStatusCancelled = "cancelled"
	InstanceStatusStale     = "stale"
	InstanceStatusError     = "error"
)

// ValidInstanceStatuses is the set of valid workflow instance status values.
var ValidInstanceStatuses = map[string]bool{
	InstanceStatusActive:    true,
	InstanceStatusCompleted: true,
	InstanceStatusCancelled: true,
	InstanceStatusStale:     true,
	InstanceStatusError:     true,
}

// ── Assignment Status Constants ─────────────

const (
	AssignmentStatusUnassigned = "unassigned"
	AssignmentStatusClaimed    = "claimed"
	AssignmentStatusCompleted  = "completed"
	AssignmentStatusCancelled  = "cancelled"
)

// ValidAssignmentStatuses is the set of valid workflow assignment status values.
var ValidAssignmentStatuses = map[string]bool{
	AssignmentStatusUnassigned: true,
	AssignmentStatusClaimed:    true,
	AssignmentStatusCompleted:  true,
	AssignmentStatusCancelled:  true,
}

// ── Workflow Instance ───────────────────────

// WorkflowInstance tracks a single execution of a workflow definition.
type WorkflowInstance struct {
	ID              string          `json:"id"`
	WorkflowID      string          `json:"workflow_id"`
	WorkflowVersion int             `json:"workflow_version"`
	CurrentStage    string          `json:"current_stage"`
	StageData       json.RawMessage `json:"stage_data"`
	Status          string          `json:"status"`
	StartedBy       string          `json:"started_by"`
	EntryToken      *string         `json:"entry_token,omitempty"`
	Metadata        json.RawMessage `json:"metadata"`
	StageEnteredAt  time.Time       `json:"stage_entered_at"`
	CreatedAt       time.Time       `json:"created_at"`
	UpdatedAt       time.Time       `json:"updated_at"`
}

// ── Workflow Assignment ─────────────────────

// WorkflowAssignment tracks per-stage work items in the team queue.
type WorkflowAssignment struct {
	ID          string          `json:"id"`
	InstanceID  string          `json:"instance_id"`
	Stage       string          `json:"stage"`
	TeamID      string          `json:"team_id"`
	AssignedTo  *string         `json:"assigned_to,omitempty"`
	Status      string          `json:"status"`
	ReviewData  json.RawMessage `json:"review_data"`
	ClaimedAt   *time.Time      `json:"claimed_at,omitempty"`
	CompletedAt *time.Time      `json:"completed_at,omitempty"`
	CreatedAt   time.Time       `json:"created_at"`
}

// ── Workflow Signoff ───────────────

// WorkflowSignoff records a user's approval or rejection at a stage boundary.
type WorkflowSignoff struct {
	ID         string    `json:"id"`
	InstanceID string    `json:"instance_id"`
	Stage      string    `json:"stage"`
	UserID     string    `json:"user_id"`
	Decision   string    `json:"decision"` // approve | reject
	Comment    string    `json:"comment"`
	CreatedAt  time.Time `json:"created_at"`
}

// Signoff decision constants.
const (
	SignoffApprove = "approve"
	SignoffReject  = "reject"
)

// ── Workflow Version (immutable snapshot) ───

// WorkflowVersion is an immutable snapshot of a workflow definition
// at a point in time. Active workflow instances run against a pinned version.
type WorkflowVersion struct {
	ID            string          `json:"id"`
	WorkflowID    string          `json:"workflow_id"`
	VersionNumber int             `json:"version_number"`
	Snapshot      json.RawMessage `json:"snapshot"`
	CreatedAt     time.Time       `json:"created_at"`
}