package gateway

import (
	"context"
	"net/http"
	"time"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/auth"
	capreg "git.yeij.top/AskaEth/Cyrene_v2/internal/capability/registry"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/session"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/iot"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/persona/loader"
	personareg "git.yeij.top/AskaEth/Cyrene_v2/internal/persona/registry"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/history"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/knowledge"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/loop"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/memory"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/orchestration"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/task"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/services/automations"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/services/backthink"
)

// This file declares the dependency contracts the gateway consumes. Every one is
// a narrow interface satisfied by a concrete backend the composition root injects
// (see Deps in deps.go), so the gateway never reaches for a concrete
// implementation and tests can substitute a stub.

// Authenticator abstracts the credential + RBAC service. *auth.JWTService is the
// production implementation; it is an interface so tests substitute a mock.
type Authenticator interface {
	// Sign issues a token for sub with the given role and lifetime.
	Sign(sub string, role auth.Role, ttl time.Duration) (string, error)
	// Verify validates a token and returns its claims.
	Verify(token string) (*auth.Claims, error)
	// Authorize returns an HTTP middleware enforcing at least one required role.
	Authorize(required ...auth.Role) func(http.Handler) http.Handler
}

// CapabilityStore abstracts the global capability registry used to enumerate
// plugins and channels in the admin API. *capability.Registry is the production
// implementation.
type CapabilityStore interface {
	// List returns every capability whose Kind matches, or all when kind is
	// empty.
	List(kind capreg.Kind) []capreg.Capability
	// SetPolicy replaces the reachability markers for the named capability.
	SetPolicy(name string, p capreg.ToolPolicy) error
}

// Chatter runs a single agent turn. *loop.Loop is the production implementation.
type Chatter interface {
	// Run drives one turn for sessionID and returns the final answer.
	Run(ctx context.Context, sessionID string, messages []model.Message) (*loop.Result, error)
}

// SessionStore lists known channel sessions. *session.SessionManager is the
// production implementation.
type SessionStore interface {
	List(ctx context.Context) ([]session.Session, error)
}

// PersonaStore lists registered characters (each bound one-to-one to a persona).
// *persona/registry.Registry is the production implementation. The gateway maps
// each Character to its wire summary; the interface deliberately returns the
// domain type so the wire shape stays out of the store contract.
type PersonaStore interface {
	List() []personareg.Character
	// Persona returns the persona with the given id (to read its visual assets).
	// The production registry implements it; the wire summary reads Avatar /
	// ChatBackground from it so each role's visuals stay role-scoped.
	Persona(id string) (*loader.Persona, bool)
}

// MemoryStore lists memory entries. *runtime/memory.Store is the production
// implementation. The gateway maps each MemoryItem to its wire summary.
type MemoryStore interface {
	List(ctx context.Context) ([]memory.MemoryItem, error)
}

// HistoryStore is the persistent chat-history store (design/16). *runtime/history.Store
// is the production implementation. When nil the session/message endpoints degrade: list
// sessions falls back to the channel-session view, and the create/messages/delete
// endpoints answer with a clear 501.
type HistoryStore interface {
	Append(ctx context.Context, msg history.Message) error
	// AppendFull persists msg like Append but returns the complete stored message
	// (with the assigned id/timestamp) so the orchestrator can broadcast it for
	// cross-end realtime sync (design/16 §4.2).
	AppendFull(ctx context.Context, msg history.Message) (history.Message, error)
	List(ctx context.Context, sessionID string, before int64, limit int, platform string) ([]history.Message, error)
	// ListAfter returns up to limit messages strictly newer than after in
	// oldest-first order, for forward incremental catch-up after a reconnect
	// (the "before" cursor can only walk backwards). platform filters as in List.
	ListAfter(ctx context.Context, sessionID string, after int64, limit int, platform string) ([]history.Message, error)
	Recent(ctx context.Context, sessionID string, n int) ([]history.Message, error)
	ListPlatformLog(ctx context.Context, platform string, before int64, limit int) ([]history.Message, error)
	ListAdapterLog(ctx context.Context, adapterID string, before int64, limit int) ([]history.Message, error)
	ListAllLog(ctx context.Context, before int64, limit int) ([]history.Message, error)
	DeleteSession(ctx context.Context, sessionID string) error
	// Search returns session-scoped content matches (newest first) for the
	// ?q= message-search path. An empty query yields an empty slice.
	Search(ctx context.Context, sessionID, query string, before int64, limit int) ([]history.Message, error)
	// UpdateMessage edits a single message's content and returns the updated
	// message. An unknown id returns history.ErrMessageNotFound.
	UpdateMessage(ctx context.Context, id, content string) (history.Message, error)
	// DeleteMessage removes a single message. An unknown id returns
	// history.ErrMessageNotFound.
	DeleteMessage(ctx context.Context, id string) error
	// RenameSession sets a session's display title (main or sub). An unknown id
	// returns history.ErrSessionNotFound.
	RenameSession(ctx context.Context, sessionID, title string) error
	// SetPinned pins/unpins a session (main or sub). An unknown id returns
	// history.ErrSessionNotFound.
	SetPinned(ctx context.Context, sessionID string, pinned bool) error
	NewSubSession(ctx context.Context, ownerID string) (string, error)
	// MarkSessionRead advances a session's read cursor (D4) to before and returns
	// the resulting cursor as a Unix millisecond timestamp; a zero before means
	// "now". The cursor only moves forward. An unknown id returns
	// history.ErrSessionNotFound.
	MarkSessionRead(ctx context.Context, sessionID string, before time.Time) (int64, error)
	ListSessions(ctx context.Context) ([]history.SessionMeta, error)
}

// IoTStore lists IoT devices. *iot.Manager is the production implementation.
type IoTStore interface {
	List(ctx context.Context) ([]iot.Device, error)
}

// SubagentAuditor audits a sub-agent's conversation context for the subagent_ask
// WS route. *orchestration.Scheduler is the production implementation.
type SubagentAuditor interface {
	AuditContext(ctx context.Context, id string, mode orchestration.AuditMode, n int, query string) (*orchestration.AuditResult, error)
}

// TaskOutputStore queries a task's output for the task_output_query WS route.
// *task.Manager is the production implementation.
type TaskOutputStore interface {
	TaskOutput(ctx context.Context, id string) (task.OutputEvent, error)
}

// AutomationStore enumerates the automations and reminders for the admin list.
// *automations.Service is the production implementation. The gateway maps each
// record to its wire shape.
type AutomationStore interface {
	List() []automations.AutomationRecord
}

// UserStore enumerates the accounts and API keys visible to the admin panel.
// The production implementation reads the configured admin account plus the
// auth.APIKey table. The gateway maps each summary to its wire shape.
type UserStore interface {
	List() []auth.UserSummary
}

// RefreshGrantStore manages opaque refresh tokens (auth.RefreshStore is the
// production implementation). It is the credential behind the refreshToken
// returned by login and the POST /auth/refresh, /auth/logout endpoints. Only
// hashes are persisted; the plaintext token crosses this interface exactly once
// per issue/rotate. Optional: when nil login omits refreshToken and the refresh
// and logout endpoints report a clear not-configured error.
type RefreshGrantStore interface {
	// Issue mints a refresh token for userID/role and returns its plaintext
	// (visible once) plus its expiry.
	Issue(ctx context.Context, userID string, role auth.Role, ttl time.Duration) (string, time.Time, error)
	// Rotate validates plaintext and, when opts.Rotate is set, revokes it and
	// returns a replacement. It returns auth.ErrInvalidGrant for an unknown,
	// revoked, or expired token.
	Rotate(ctx context.Context, plaintext string, opts auth.RotateOptions) (auth.RefreshToken, string, error)
	// Revoke marks the token matching plaintext revoked, returning whether a
	// live token was found. It is idempotent.
	Revoke(ctx context.Context, plaintext string) (bool, error)
	// RevokeAll deletes every refresh token (global invalidation on secret
	// rotation) and returns how many were removed.
	RevokeAll(ctx context.Context) (int64, error)
	// RevokeByUser deletes every refresh token for userID (logout by access
	// token, where the individual grant is unknown) and returns how many were
	// removed.
	RevokeByUser(ctx context.Context, userID string) (int64, error)
}

// BackthinkStore enumerates the persisted background-think records for the
// M9/M10 monitor panel. *backthink.Backthink is the production implementation.
type BackthinkStore interface {
	List(ctx context.Context, limit int) ([]backthink.Record, error)
}

// ChannelConfigStore is the runtime-editable channel-adapter configuration
// (channels.json, design/04 §3.1). It is implemented by the composition root's
// channel store: Load returns the effective per-platform accounts (file → env
// fallback), Path reports the channels.json path, and Reload hot-replaces a
// platform's running adapters after a panel save (Bridge.Reload). Load returns
// account configs with real tokens so the owner write path can persist them; the
// admin read path masks them before returning to the client.
type ChannelConfigStore interface {
	Path() string
	// Load returns the effective per-platform accounts (file → env fallback),
	// including the secret tokens needed to persist them.
	Load() map[string][]config.ChannelAccount
	// Reload rebuilds and hot-replaces the running adapters for platform.
	Reload(platform string) error
}

// OwnerRegistrar registers a channel account id into the owner whitelist
// (configs/users/owner.yaml). It is the structural identity red line: a scan-login
// confirmation stamps the scanner's bound ilink_user_id into the whitelist so the
// channel bridge recognizes it as the owner via actor metadata, never a prompt.
// The composition root implements it (cmd/cyrene's ownerRegistrar) to persist the
// whitelist and hot-update the live owner profile. Registration is best-effort:
// a failure is logged by the caller but does not fail the already-applied
// channels.json persist.
type OwnerRegistrar interface {
	RegisterChannelOwner(ctx context.Context, platform, accountID string) error
}

// RagStore backs the admin knowledge-base RAG module (design/10 §3.12 module 8).
// *runtime/knowledge.Store is the production implementation: it lists/searches
// the project index, imports a document (chunk + index) and deletes one
// (project entry + cascaded chapters). An implementation that cannot write
// reports a clear error (knowledge.ErrWriteUnsupported) rather than a fabricated
// success; the handlers map a missing document to 404.
type RagStore interface {
	// ListDocuments enumerates the knowledge-base documents (project-index
	// entries).
	ListDocuments(ctx context.Context) ([]knowledge.Doc, error)
	// Search answers a knowledge-base query (line-level hierarchy + optional
	// semantic/vector ranking).
	Search(ctx context.Context, query string) ([]knowledge.Hit, error)
	// IndexDocument uploads/chunks/embeds a document into the project index.
	IndexDocument(ctx context.Context, doc knowledge.Doc) error
	// DeleteDocument removes a document (and its chapters) by id, returning
	// knowledge.ErrDocumentNotFound when no such document exists.
	DeleteDocument(ctx context.Context, id string) error
}