package main

import (
	"context"
	"database/sql"
	"fmt"
	"log/slog"
	"time"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/bus"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/capability/mcp"
	pluginmgr "git.yeij.top/AskaEth/Cyrene_v2/internal/capability/plugin"
	"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/db"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/iot"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/persona/emotion"
	personareg "git.yeij.top/AskaEth/Cyrene_v2/internal/persona/registry"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/exec"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/history"
	"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/memory/projectindex"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/memory/vector"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/multimodal/voice"
	"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/runtime/tool"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/services/automations"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/services/backthink"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/services/channelbridge"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/services/gateway"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/user"
)

// defaultOwnerPath and defaultPersonasDir point at the on-disk persona/owner
// definitions shipped with the repo; they are relative to the working directory.
const (
	defaultOwnerPath    = "configs/users/owner.yaml"
	defaultPersonasDir  = "configs/personas"
	defaultSQLitePath   = "./data/cyrene.db"
	fallbackInstruction = "You are Cyrene, a warm and attentive companion."

	// Bound/knob constants. Compile-time so no bare magic number appears in the
	// runtime path (project rule §10).
	defaultMaxRounds   = 8
	defaultMaxParallel = 4
	defaultAgentID     = "orchestrator"
	defaultToolTimeout = 30 * time.Second
)

// app holds every subsystem the single Cyrene binary assembles. It is built by
// newApp and torn down by close on shutdown.
type app struct {
	cfg           *config.Config
	log           *slog.Logger
	db            *sql.DB
	dbPath        string
	bus           bus.Bus
	modelAdapter  model.Adapter
	llm           *model.RuntimeLLM
	personas      *personareg.Registry
	caps          *registry.Registry
	dispatcher    *tool.Dispatcher
	memStore      *memory.Store
	retriever     *memory.Retriever
	projStore     *projectindex.Store
	loop          *loop.Loop
	scheduler     *orchestration.Scheduler
	tasks         *task.Manager
	execProv      exec.Provider
	iot           *iot.Manager
	voice         *voice.Chain
	mcpRegs       []*mcp.Registry
	plugins       *pluginmgr.Manager
	sessions      *session.SessionManager
	automation    *automations.Service
	backthink     *backthink.Backthink
	vindex        vector.Index
	owner         *user.OwnerProfile
	history       *history.Store
	gw            *gateway.Server
	channelBridge *channelbridge.Bridge
	channels      gateway.ChannelConfigStore
	// capacitySink broadcasts capacity_awaken transitions to the Web UI (design/14
	// §5). It is satisfied by *gateway.Server (BroadcastCapacityAwaken); held as an
	// interface so the composition root is unit-testable with a fake sink.
	capacitySink capacityEmitter
	// emotion applies each settled turn to the bound persona's emotion machine and
	// affection (design/01 §2) and hands the changes to moodSink. Nil when no
	// persona was registered, in which case no mood is tracked or persisted.
	emotion *emotion.Observer
	// moodSink broadcasts a mood change to the Web UI (design/07 §3). It is
	// satisfied by *gateway.Server (BroadcastMood); held as an interface so the
	// composition root is unit-testable with a fake sink.
	moodSink moodEmitter
	// traceWriter fans finished trace spans out to the JSONL stderr recorder and,
	// once the gateway exists, to the gateway's observability buffer behind
	// GET /api/v1/admin/observability/trace (design/19 §2). It is held so
	// wireFrontend can register the gateway sink on the already-running tracer.
	traceWriter *traceFanout
}

// newApp assembles the full Cyrene runtime from cfg and log. It opens the
// database, migrates the schema, wires the persona registry, model adapter, tool
// dispatcher, memory stack, agent loop, orchestration, execution, IoT, channel
// sessions/adapters and the gateway, and returns the ready app.
//
// Fatal wiring failures (database open/migrate, required auth, gateway) are
// returned as errors; optional subsystems degrade gracefully so the binary can
// boot even when a model key or external channel is not configured.
func newApp(ctx context.Context, cfg *config.Config, log *slog.Logger) (*app, error) {
	dataDir := resolveDataDir(cfg)
	databasePath := resolveSQLitePath(cfg, dataDir)
	dbCfg := cfg.DB
	dbCfg.SQLitePath = databasePath

	sqlDB, err := db.Open(ctx, databasePath, log)
	if err != nil {
		return nil, fmt.Errorf("open database: %w", err)
	}
	if err := db.MigrateUp(ctx, sqlDB, log); err != nil {
		_ = sqlDB.Close()
		return nil, fmt.Errorf("migrate database: %w", err)
	}

	eventBus := bus.New()
	a := &app{
		cfg:    cfg,
		log:    log,
		db:     sqlDB,
		dbPath: databasePath,
		bus:    eventBus,
		caps:   registry.New(),
	}

	// Release already-opened resources if any later wiring step fails, without
	// the full-service shutdown log (a partial boot is not a clean shutdown).
	completed := false
	defer func() {
		if completed {
			return
		}
		if a.vindex != nil {
			_ = a.vindex.Close()
		}
		if a.tasks != nil {
			_ = a.tasks.Close()
		}
		if a.bus != nil {
			_ = a.bus.Close()
		}
		if a.db != nil {
			_ = a.db.Close()
		}
	}()

	if err := a.buildPersonas(); err != nil {
		return a, err
	}
	if err := a.wireMemory(ctx); err != nil {
		return a, err
	}
	if err := a.wireRuntime(); err != nil {
		return a, err
	}
	if err := a.wireAuxiliary(); err != nil {
		return a, err
	}
	a.wirePlugins(ctx)
	if err := a.wireChannels(); err != nil {
		return a, err
	}
	if err := a.wireFrontend(); err != nil {
		return a, err
	}
	completed = true
	return a, nil
}