// Package llms — wiring.go: the production boot hook that rebuilds the
// package registry with the lane registry, the failover convars, and the
// failover-event observer.
//
// Why a dedicated helper (vs spreading registry construction through
// mort.go): the chatbot regression test in lane_chatbot_test.go and the
// production boot path must call the SAME wiring code. Historically
// mort.go skipped the lane wiring entirely (lanes were defined but never
// installed — 30+ skill_runs in production with 0 skill_queue_jobs rows);
// concentrating the install here means a regression in one wires fails
// the test for the other.
package model

import (
	"context"
	"log/slog"
	"time"

	majordomo "gitea.stevedudenhoeffer.com/steve/majordomo"
)

// WireOptions configures Wire. The zero value rebuilds the registry with
// no lanes and default failover behavior.
type WireOptions struct {
	// Lanes is the lane registry every provider is decorated with. nil
	// disables lane queueing (calls pass straight through) but keeps
	// error attribution for the failover log.
	Lanes LaneRegistry

	// FailoverMaxRetries maps the llms.failover.max_retries convar onto
	// majordomo's ChainConfig.TransientRetries (same-target retries after
	// a transient error). <= 0 keeps majordomo's default (1).
	FailoverMaxRetries int

	// FailoverCooldown maps the llms.failover.cooldown_seconds convar
	// onto health.Config.BaseCooldown. majordomo grows the cooldown
	// exponentially from this base per consecutive bench; the cap is
	// max(FailoverCooldown, 5m) so the operator's dial dominates.
	// <= 0 keeps the mort default (300s).
	FailoverCooldown time.Duration

	// FailoverObserver receives one event per failover decision (failed
	// attempt, bench, benched-skip). Wire it to failoverlog.NewObserver.
	// Attribution (caller/run/prompts) rides on the event's error — see
	// CallInfoFromError.
	FailoverObserver func(majordomo.FailoverEvent)
}

// Wire rebuilds the package registry from opts and installs it. Call once
// at boot, after the lane registry and the failover convars exist (and
// after Init for DB-backed tiers — though Init and Wire are order-
// independent: the tier resolver is consulted through a delegating
// indirection).
//
// Rebuilding discards in-memory health/bench state — Wire is a boot-time
// operation, not a runtime toggle.
//
// When Lanes is non-nil, the well-known lanes (KnownLanes) are eagerly
// registered so admin dashboards have baseline state from the moment mort
// starts instead of "no lanes registered" until the first LLM call.
//
// Returns the installed registry for inspection (tests, health surfaces).
func Wire(ctx context.Context, opts WireOptions) *majordomo.Registry {
	r := buildRegistry(buildConfig{
		lanes:      opts.Lanes,
		maxRetries: opts.FailoverMaxRetries,
		cooldown:   opts.FailoverCooldown,
		observer:   opts.FailoverObserver,
	})
	setRegistry(r)

	if opts.Lanes != nil {
		names := KnownLanes()
		for _, name := range names {
			opts.Lanes.GetOrCreate(ctx, name)
		}
		slog.Info("llms: wired lane-aware registry", "lanes", len(names))
	} else {
		slog.Warn("llms: Wire called without a lane registry — lane queueing is inert")
	}
	return r
}

// KnownLanes returns the well-known lane names the LLM transport resolves
// to. Eager-registering these at boot gives admin dashboards
// (`/skills/admin/queues`, `.skill admin queue`) a baseline view from the
// moment mort starts — without this, the dashboard reads "no lanes
// registered" until the first chatbot/skill call materialises the lane
// via lazy GetOrCreate.
//
// Why this list (and not "every lane name ever"): these are the ones
// LaneFor in lane_mapping.go can produce for a real model spec. Future
// non-LLM lanes (e.g. a future image-generation lane) should be eagerly
// registered by their owning subsystem, not here.
//
// LaneSkillDefault is included even though it isn't an LLM-routing
// lane: skills run through it via skillexec.WithLaneRegistry, and the
// skills admin dashboard needs to see it from boot.
//
// Test: wiring_test.go::TestKnownLanes_NonEmpty.
func KnownLanes() []string {
	return []string{
		LaneOllama,
		LaneAnthropicThinking,
		LaneAnthropicDefault,
		LaneM1,
		LaneLLMDefault,
		"skill-default",
	}
}