package capture

import (
	"context"
	"time"

	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
)

// Ref is the read-after-write handle returned by a brain write/update —
// the #45 contract. ContentHash lets the caller confirm what landed
// without a re-query; for an Update, Superseded is true.
type Ref struct {
	ID          string
	Path        string
	ContentHash string
	Superseded  bool
}

// StoredNote is a brain note fetched by Get: the read-after-write
// confirmation primitive (a direct fetch, never a semantic query).
type StoredNote struct {
	ID          string
	Path        string
	ContentHash string
	Frontmatter map[string]string
	Body        string
}

// Note is the brain-write payload. It carries both the wing/hall taxonomy
// and the legacy type/domain fields so a single BrainStore serves both
// capture insights and the existing MCP brain_write surface. Reason is
// the supersede rationale, used only by Update.
type Note struct {
	Content  string
	Filename string
	Wing     string
	Hall     string
	Type     string
	Domain   string
	Reason   string
}

// BrainStore is the brain persistence port — the shared implementation of
// the #45 write/update/get verbs that both the MCP handlers and capture
// call, so there is one implementation, not two. The read-after-write +
// staleness discipline lives behind this interface so no caller carries
// the rule.
type BrainStore interface {
	Write(ctx context.Context, n Note) (Ref, error)
	Update(ctx context.Context, slug string, n Note) (Ref, error)
	Get(ctx context.Context, id string) (StoredNote, error)
}

// IssueRef identifies a ticket touched by the tracker.
type IssueRef struct {
	Repo   string
	Number int
	URL    string
}

// IssueTracker is the Gitea ticket port. The implementation (#52) always
// scopes to owner "mathias"; the port deliberately omits owner.
type IssueTracker interface {
	CreateIssue(ctx context.Context, repo, title, body string) (IssueRef, error)
	// CloseIssue closes an issue, optionally posting a closing comment
	// first (empty comment ⇒ close only).
	CloseIssue(ctx context.Context, repo string, number int, comment string) (IssueRef, error)
	CommentIssue(ctx context.Context, repo string, number int, body string) (IssueRef, error)
}

// ClassificationPolicy derives a target's sensitivity (model C). The
// "stricter wins" combination of declared vs derived is use-case policy
// and lives in the service, so the port stays minimal. Satisfied by
// classification.Config (#50).
type ClassificationPolicy interface {
	Derive(target classification.Target) classification.Level
}

// AuditEntry is the request-level audit record (I5): who/what captured
// what, when, via which principal. SecurityEvents carries anomalies such
// as a caller under-declaring sensitivity relative to the target floor.
type AuditEntry struct {
	Timestamp               time.Time
	Principal               string
	Actor                   string
	Harness                 string
	SessionRef              string
	EffectiveClassification string
	Items                   []string
	SecurityEvents          []string
}

// AuditOutcome is how a capture's audit record was (or will be) persisted.
type AuditOutcome int

const (
	// AuditCentral means the record goes to the central sink (loki).
	AuditCentral AuditOutcome = iota
	// AuditBuffered means the central sink was unreachable and the record
	// is written to a durable local buffer for later reconciliation
	// (internal/public tier only).
	AuditBuffered
)

// AuditSink is the two-phase, classification-aware audit port (I5, §4.4).
//
// Reserve runs BEFORE any write and decides whether the capture can be
// audited at its effective classification: it returns the outcome to use,
// or an error to refuse the capture before anything is written
// (confidential + central sink down → refuse; the all-tiers floor when
// nothing can record → refuse). Record runs AFTER the writes and persists
// the final entry per the reserved outcome.
//
// Splitting reserve from record is what lets "confidential + sink-down →
// refuse before any write" be literally true while the record itself
// (which lists what landed) is necessarily written afterwards.
type AuditSink interface {
	Reserve(ctx context.Context, level classification.Level) (AuditOutcome, error)
	Record(ctx context.Context, e AuditEntry, outcome AuditOutcome) error
}