// signals.go holds the intent layer vocabulary and the L1/L2/L3 layers; the
// package doc lives in capacity.go.
package capacity

import (
	"context"
	"strings"
)

// 内置档位集里「后加的能力」的工具名（字面量，与既有条目同一口径：
// 这两份集合是**策略清单**，不反向依赖具体能力包）。两处都登记是 X1 的
// 硬要求 —— 能力注册了却不在允许集里，等于 CAPACITY_ENABLED=true 时它调不动：
//
//   - "transcode"（internal/capability/transcode，design/25）：纯本地、有输入上限
//     与并发闸，属陪伴侧真正会用的能力（语音转写）；
//   - "capability_list"（internal/capability/registry 的 ToolName，X1 / 裁决 15）：
//     她自查「我有哪些能力/插件、外围子系统什么状态」的**只读**抓手，必须在她
//     思考时所处的静息态就可见，否则这条裁决在安静态失效。
//
// 重命名任一个 ⇒ internal/runtime/capacity/capacity_test.go 的
// TestDecide_AllowedSets 与 cmd/cyrene 的组合根断言同时变红（见 X1 报告变异表）。
const (
	transcodeToolName      = "transcode"
	capabilityListToolName = "capability_list"
	// selfWakeToolName 是「自排一次思考」工具的名字（internal/services/backthink 的
	// ThinkToolName，design/12 §N C.3）。它必须**同时**进下面两张内置允许集：
	// 她思考时通常落在静息态（陪伴 / 夜里），只进唤醒态等于「注册了却看不见」。
	//
	// ⚠️ 主人若用既有的 `CAPACITY_TOOL_SETS` 覆盖档位集，这两张内置表会被**整体替换**
	// （`wire_capacity.go` 的 parseCapacityToolSets），那份 JSON 里没写 request_think
	// 就照样看不见 —— 该键是「替换」不是「追加」，这条口径与 X1 的同类缺口同源。
	selfWakeToolName = "request_think"
)

// defaultQuietTools is the companion-safe face (design §1): terminal + file edit
// + memory/emotion companion. It is a function building the slice fresh so no
// package-level global slice is introduced (project rule §10).
func defaultQuietTools() []string {
	return []string{"terminal", "file", "knowledge", "text", transcodeToolName, capabilityListToolName, selfWakeToolName}
}

// defaultAwakeTools extends the quiet face with web/network retrieval (design
// §1 唤醒态): a real task wakes the retrieval tools, file and terminal.
func defaultAwakeTools() []string {
	return []string{
		"terminal", "file", "knowledge", "text",
		"web-search", "web-fetch", "http",
		transcodeToolName, capabilityListToolName, selfWakeToolName,
	}
}

// intent classifies the round. It runs L1 on the current turn, falls to L2 on
// the recent context trend, then to the model-assisted L3 layer when it is
// enabled, and folds in the L4 learned-habit verdict (design §2.2) at each layer:
// L4 may correct a decided result (boost / quiet→awake) or fill in when L1/L2/L3
// are undecided. With no matching habit L4 is silent, so a turn with no recall
// behaves exactly as before; otherwise the result stays conservative (低置信 still
// rests via applyAwakening).
func (d *Decider) intent(ctx context.Context, in Input) (State, float64, string) {
	if len(in.Messages) == 0 {
		return "", 0, ""
	}
	current := in.Messages[len(in.Messages)-1]
	l4s, l4c, l4t, l4ok := d.l4(current, in.Recall)
	if s, c, t, ok := l1(current); ok {
		return d.mergeL4(s, c, t, l4s, l4c, l4t, l4ok)
	}
	if s, c, t, ok := l2(in.Messages); ok {
		return d.mergeL4(s, c, t, l4s, l4c, l4t, l4ok)
	}
	if s, c, t, ok := d.l3(ctx, current); ok {
		return d.mergeL4(s, c, t, l4s, l4c, l4t, l4ok)
	}
	if l4ok {
		return l4s, l4c, l4t
	}
	return "", 0.3, "" // 拿不准 → conservative fallback
}

// l3 runs the model-assisted intent layer (design/14 §2.2 L3; 裁决 14.4.4): the
// configured classifier judges the current turn and its verdict is trusted only
// at or above the wake threshold — a low-confidence verdict is treated as
// undecided, so a hesitant model can never wake tools on its own. A classifier
// error is reported and treated the same way. With the layer off this returns
// ok=false immediately, leaving L1/L2/L4 behavior byte-identical.
func (d *Decider) l3(ctx context.Context, current string) (State, float64, string, bool) {
	if d.l3cache == nil {
		return "", 0, "", false
	}
	j, err := d.l3cache.classify(ctx, current)
	if err != nil {
		d.log.Warn("capacity L3 classifier unavailable, keeping the conservative default", "error", err)
		return "", 0, "", false
	}
	if j.Confidence < d.cfg.MinConfidence {
		d.log.Debug("capacity L3 verdict below threshold, treated as undecided",
			"confidence", j.Confidence, "threshold", d.cfg.MinConfidence, "is_task", j.IsTask)
		return "", 0, "", false
	}
	if !j.IsTask {
		return StateQuiet, j.Confidence, "", true
	}
	if j.TaskKind == taskKindComplex {
		return StateFull, j.Confidence, inferTool(current), true
	}
	return StateAwake, j.Confidence, inferTool(current), true
}

// l1 is the fast heuristic on the current turn (design §2.2 L1): a strong
// action signal wakes (awake, or full for complex work); a clear companion
// signal (weak + no task object) stays quiet; otherwise it is undecided and the
// caller defers to L2.
func l1(current string) (State, float64, string, bool) {
	if hasStrongSignal(current) {
		if isComplex(current) {
			return StateFull, 0.9, inferTool(current), true
		}
		return StateAwake, 0.9, inferTool(current), true
	}
	if isClearCompanion(current) {
		return StateQuiet, 0.8, "", true
	}
	return "", 0, "", false
}

// l2 looks at the recent context trend (design §2.2 L2) when L1 is undecided:
// a session firmly leaning task (or a follow-up on the previous task) wakes;
// a session firmly leaning emotional keeps quiet; a balanced window defers.
func l2(messages []string) (State, float64, string, bool) {
	window := lastN(messages, 6)
	task, comp := 0, 0
	lastTask := ""
	for _, m := range window {
		switch {
		case hasStrongSignal(m):
			task++
			lastTask = m
		case isClearCompanion(m):
			comp++
		case hasFollowup(m):
			task++
		}
	}
	if task > comp {
		if isComplex(lastTask) {
			return StateFull, 0.66, inferTool(lastTask), true
		}
		return StateAwake, 0.66, inferTool(lastTask), true
	}
	if comp > task {
		return StateQuiet, 0.7, "", true
	}
	return "", 0, "", false
}

// lastN returns the last n elements of messages (or all when shorter).
func lastN(messages []string, n int) []string {
	if len(messages) <= n {
		return messages
	}
	return messages[len(messages)-n:]
}

// hasStrongSignal reports a task-verb present together with either an
// imperative marker (帮我/请/去/把/将) or a concrete task object (file path,
// URL, code, a task noun) — 明确的动作指令 + 任务对象 (design §2.2 L1).
func hasStrongSignal(text string) bool {
	if !hasStrongVerb(text) {
		return false
	}
	return hasImperativeMarker(text) || hasTaskObject(text)
}

// hasStrongVerb reports an action verb that implies work (查/改/写/搜/跑/部署…).
func hasStrongVerb(text string) bool {
	return containsAny(text, strongVerbs())
}

// strongVerbs is the L1 action-verb vocabulary.
func strongVerbs() []string {
	return []string{
		"帮我", "查", "查询", "查一下", "搜索", "搜", "搜一下", "查找", "找一下", "找",
		"看", "看看", "检查", "核对", "改", "修改", "编辑", "写", "编写", "创建",
		"生成", "实现", "配置", "修复", "删除", "移除", "升级", "更新", "搭建",
		"部署", "迁移", "重构", "运行", "执行", "跑", "编译", "构建", "安装",
		"启动", "重启", "停止", "下载", "上传", "翻译", "计算", "对比", "分析",
		"总结", "汇报", "审批", "编排",
		// ASCII
		"help me", "search", "query", "look up", "find", "edit", "modify",
		"write", "create", "generate", "fix", "refactor", "migrate", "deploy",
		"build", "run", "compile", "install", "start", "restart", "stop", "test",
		"analyze", "calculate", "compare", "please",
	}
}

// hasImperativeMarker reports a direct instruction cue (帮我/请/去/把/将/麻烦…).
func hasImperativeMarker(text string) bool {
	return containsAny(text, imperativeMarkers())
}

func imperativeMarkers() []string {
	return []string{
		"帮我", "请", "给我", "麻烦你", "你能", "你可不可以", "去", "把", "将",
		"帮忙", "拜托", "帮我一下",
		// ASCII
		"please", "help me", "can you", "could you", "would you",
	}
}

// hasTaskObject reports a concrete task object: a file path, URL, code snippet,
// or an object noun (报告/文档/代码/测试/设备…).
func hasTaskObject(text string) bool {
	return hasFileObject(text) || hasURLObject(text) || hasCodeObject(text) || hasTaskNoun(text)
}

// hasFileObject reports a path-like target (a known source extension, a drive
// path, a "./" or "../" relative path, a bare filename such as cx.go).
func hasFileObject(text string) bool {
	for _, ext := range fileExtensions() {
		if strings.Contains(text, ext) {
			return true
		}
	}
	if strings.Contains(text, "./") || strings.Contains(text, "../") {
		return true
	}
	return false
}

// fileExtensions is the source/config extension set used for object detection.
func fileExtensions() []string {
	return []string{
		".go", ".ts", ".tsx", ".js", ".jsx", ".py", ".rs", ".java", ".c", ".cpp",
		".h", ".yaml", ".yml", ".json", ".toml", ".ini", ".conf", ".mod", ".sum",
		".md", ".txt", ".css", ".html", ".sh", ".sql", ".proto", ".env.example",
	}
}

// hasURLObject reports an http(s) URL or a bare web host.
func hasURLObject(text string) bool {
	return containsAny(text, []string{"http://", "https://", "www.",
		".com", ".cn", ".net", ".org", ".io", ".dev", ".xyz", ".ai"})
}

// hasCodeObject reports a code snippet (backticks, brace pairs, declarations).
func hasCodeObject(text string) bool {
	return containsAny(text, []string{"`", "func ", "def ", "return ", ":= ",
		"class ", "import ", "package ", "const ", "var ", "=>", "};"})
}

// hasTaskNoun reports a concrete work object noun.
func hasTaskNoun(text string) bool {
	return containsAny(text, taskNouns())
}

// taskNouns is the object-noun vocabulary for object detection.
func taskNouns() []string {
	return []string{
		"报告", "文档", "代码", "脚本", "测试", "文件", "项目", "结果", "数据",
		"接口", "配置", "日志", "表格", "图片", "网页", "页面", "服务器", "服务",
		"设备", "手机", "电脑", "城市", "天气", "新闻", "价格", "股票", "汇率",
		"系统", "数据库", "模型", "论文", "资料", "链接",
		// ASCII
		"report", "doc", "code", "script", "test", "file", "project", "server",
		"device", "config", "log", "url", "api", "database", "page",
	}
}

// isClearCompanion reports a pure companionship turn: a weak (emotional/greeting)
// signal with no task verb and no task object (设计 §2.2 L1 弱信号→静息).
func isClearCompanion(text string) bool {
	if !hasWeakSignal(text) {
		return false
	}
	if hasStrongSignal(text) {
		return false
	}
	return !hasTaskObject(text)
}

// hasWeakSignal reports a companion-leaning cue (问候/情绪词/日常寒暄).
func hasWeakSignal(text string) bool {
	return containsAny(text, weakSignals())
}

// weakSignals is the L1 companion vocabulary.
func weakSignals() []string {
	return []string{
		"你好", "嗨", "哈喽", "早上好", "早安", "中午好", "下午好", "晚上好",
		"晚安", "在吗", "在不在", "抱抱", "么么", "亲亲", "摸摸", "想你",
		"爱你", "喜欢你", "想念", "我好", "我累", "累了", "疲惫", "困了",
		"无聊", "寂寞", "失眠", "睡不着", "难过", "伤心", "开心", "高兴",
		"哈哈", "嘿嘿", "呜呜", "555", "哭", "笑", "心疼", "安慰", "谢谢",
		"辛苦", "再见", "明天见", "待会见", "怎么了", "在干嘛", "干嘛呢",
		"好呀", "好的", "好哒", "嗯嗯", "嗯", "好", "喔", "哦", "呀",
		// ASCII
		"hi", "hello", "hey", "good morning", "good night", "good evening",
		"hug", "miss you", "love you", "haha", "lol", "aww", "ty", "thanks",
		"bye", "thinking", "sleepy", "tired", "happy", "mood", "nice",
	}
}

// hasFollowup reports a continuation cue pointing at the previous task
// (设计 §2.2 L2: 上一轮任务的跟进 继续/然后呢/还有吗).
func hasFollowup(text string) bool {
	return containsAny(text, followups())
}

func followups() []string {
	return []string{
		"继续", "然后呢", "还有吗", "还有呢", "接着", "下一步", "接下来",
		"之后呢", "那然后", "继续做", "继续写", "继续说", "再来", "再继续",
		// ASCII
		"continue", "and then", "next", "what else", "also", "go on", "more",
	}
}

// isComplex reports whether a task is complex enough for the full state
// (设计 §1 全能态·复杂任务): refactor/migrate/deploy/whole-project/multi-file…
func isComplex(text string) bool {
	return containsAny(text, complexMarkers())
}

func complexMarkers() []string {
	return []string{
		"重构", "搭建", "部署", "迁移", "架构", "实现一个", "写一个", "做一个",
		"整个项目", "全部", "所有", "批量", "多文件", "多个文件", "全量",
		"综合", "一体化", "测试全部", "修复所有", "上下链路", "系统设计",
		// ASCII
		"refactor", "migrate", "architect", "build a", "full", "all the",
		"multiple files", "entire", "whole", "batch",
	}
}

// inferTool names the tool that a task turn would light up, used for the
// capacity_awaken event's Tool field (点亮工具). Order: file path/code → file,
// query/search → web-search, else terminal.
func inferTool(text string) string {
	switch {
	case hasFileObject(text), hasCodeObject(text):
		return "file"
	case containsAny(text, []string{
		"查", "查询", "搜", "搜索", "查找", "找一下", "search", "query",
		"look up", "find", "查一下", "搜索一下",
	}):
		return "web-search"
	case containsAny(text, []string{
		"跑", "运行", "执行", "部署", "编译", "构建", "安装", "启动", "重启",
		"测试", "run", "deploy", "build", "compile", "install", "start",
		"restart", "exec", "test",
	}):
		return "terminal"
	default:
		return ""
	}
}

// containsAny reports whether text contains any of words (a simple substring
// match; every word is a UTF-8 substring).
func containsAny(text string, words []string) bool {
	for _, w := range words {
		if strings.Contains(text, w) {
			return true
		}
	}
	return false
}