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/embedding"
	"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 与 defaultPersonasDir 指向随仓库分发的磁盘上人格/主人定义，
// 路径相对工作目录。
const (
	defaultOwnerPath    = "configs/users/owner.yaml"
	defaultPersonasDir  = "configs/personas"
	defaultSQLitePath   = "./data/cyrene.db"
	fallbackInstruction = "You are Cyrene, a warm and attentive companion."

	// 上界与旋钮常量。编译期定值，运行时路径上不出现裸魔法数字（项目规范 §10）。
	defaultMaxRounds   = 8
	defaultMaxParallel = 4
	defaultAgentID     = "orchestrator"
	defaultToolTimeout = 30 * time.Second
)

// app 持有单二进制 Cyrene 组装的全部子系统：由 newApp 构建，关闭时由 close 拆除。
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
	// embedder 与 memoryTidy 属于记忆整理（design/23）：整理只在 embedder
	// 上算召回相似度，绝不接触会话/历史读数。
	embedder      embedding.Embedder
	memoryTidy    *memory.TidyService
	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
	// docGC 是文档回收的常驻任务（切片 S7）：未被引用且超过保留期的文档连同
	// sidecar 与元数据行一起回收。GC 被配置关闭时为 nil（见 wire_document_gc.go）。
	docGC *documentGC
	// usage 是 LLM 用量的异步落库出口（切片 U1）：注入模型栈后，每次成功模型
	// 调用都会把非敏感计数样本塞进它的有界队列。库未接时为 nil（= 只记日志）。
	usage *model.UsageWriter
	// usageGC 是用量样本的保留期清理常驻任务。`LLM_USAGE_RETENTION ≤ 0` 时为
	// nil（清理关闭，见 wire_usage.go）。
	usageGC *usageRetentionGC
	// capacitySink 把 capacity_awaken 状态迁移广播给 Web UI（design/14 §5）。
	// 由 *gateway.Server 满足（BroadcastCapacityAwaken）；以接口形式持有，
	// 组合根才能用假出口做单元测试。
	capacitySink capacityEmitter
	// emotion 把每一轮落定的对话施加到所绑人格的情绪机与好感度上（design/01 §2），
	// 并把变化交给 moodSink。没有注册人格时为 nil，此时不追踪、不持久化任何心情。
	emotion *emotion.Observer
	// moodSink 把心情变化广播给 Web UI（design/07 §3）。由 *gateway.Server 满足
	// （BroadcastMood）；以接口形式持有，组合根才能用假出口做单元测试。
	moodSink moodEmitter
	// traceWriter 把完成的 trace span 扇出到 JSONL stderr 记录器，网关出现后也送往
	// 网关的可观测性缓冲（挂在 GET /api/v1/admin/observability/trace 后面，
	// design/19 §2）。持有它是为了让 wireFrontend 能往已在运行的 tracer 上注册
	// 网关出口。
	traceWriter *traceFanout
}

// newApp 依据 cfg 与 log 组装完整的 Cyrene 运行时：打开数据库、迁移表结构，接线
// 人格注册表、模型适配器、工具分发器、记忆栈、agent 循环、编排、执行、IoT、
// 渠道会话/适配器与网关，最后返回就绪的 app。
//
// 致命的接线失败（数据库打开/迁移、必需的认证、网关）以错误返回；可选子系统则
// 优雅降级，使得未配置模型密钥或外部渠道时二进制仍能启动。
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(),
	}

	// 后续任一接线步骤失败时，释放已经打开的资源，但不打整套服务关闭日志
	// （半途启动不等同于一次干净退出）。
	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
}