package main

import (
	"encoding/json"
	"fmt"
	"log/slog"
	"strings"
	"time"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/persona/loader"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/capacity"
)

// 本文件拥有唤醒式能力（capacity）决策层的装配：判定器构造、工具集 JSON 解析、
// L3 缓存 TTL 解析与 capacity_awaken 事件出口。它从 wire_runtime.go 拆出
// （AGENTS §10 文件 ≤500 行；wire.go 拆分建议同样适用于本文件）。

// buildCapacity constructs the awakened-capacity decider when enabled, or nil
// (which keeps the loop's default all-tools behavior). It is opt-in via
// CAPACITY_ENABLED; the allowed-set mapping comes from CAPACITY_TOOL_SETS and
// falls back to built-in defaults on a parse error.
//
// The model-assisted L3 layer (裁决 14.4.4) is a second, independent switch
// (CAPACITY_L3_ENABLED, default false): even with capacity on, L3 stays silent
// unless it was explicitly asked for, and its verdict cache TTL
// (CAPACITY_L3_CACHE_TTL, default 5m) is parsed here because the config loader
// only carries scalars.
//
// The persona-level awakening override (裁决 14.4.3) enters the decision layer in
// two places. This function fills the *global* fallback (Config.Awakening) from the
// current main persona's YAML block (see defaultAwakening): it is what a persona
// declaring no block inherits. The per-turn value is resolved by awakeningFor,
// which the loop calls for every turn's own role through
// loop.Options.PersonaAwakening — without it, a non-default character's
// `awakening` block would be parsed, validated and then silently ignored
// (forbidden by design/01 §2.1).
func (a *app) buildCapacity() *capacity.Decider {
	if !a.cfg.Capacity.Enabled {
		return nil
	}
	sets, err := parseCapacityToolSets(a.cfg.Capacity.ToolSetsJSON)
	if err != nil {
		a.log.Warn("capacity tool sets parse failed, using built-in defaults", "error", err)
		sets = nil
	}
	awakening := a.defaultAwakening()
	if !awakening.IsZero() {
		logger.WithSource(a.log, "cmd/cyrene").Info("capacity awakening override applied",
			"default_state", awakening.DefaultState, "min_confidence", awakening.MinConfidence,
			"force_state", awakening.ForceState, "persona", a.defaultPersonaID())
	}
	cfg := capacity.Config{
		Enabled:       true,
		MinConfidence: a.cfg.Capacity.MinConfidence,
		ToolSets:      sets,
		Awakening:     awakening,
	}
	if a.cfg.Capacity.L3Enabled {
		cfg.L3Enabled = true
		cfg.L3Classifier = capacity.NewLLMClassifier(a.modelAdapter, a.log)
		cfg.L3CacheTTL = parseL3CacheTTL(a.cfg.Capacity.L3CacheTTL, a.log)
	}
	return capacity.New(cfg, capacity.WithLogger(a.log))
}

// parseL3CacheTTL parses the CAPACITY_L3_CACHE_TTL duration string. An empty
// value selects the code default (5m, the landing suggestion of 裁决 14.4.4); an
// unparsable value is reported and falls back to the same default rather than
// silently disabling the cache.
func parseL3CacheTTL(raw string, log *slog.Logger) time.Duration {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return capacity.DefaultL3CacheTTL
	}
	d, err := time.ParseDuration(raw)
	if err != nil {
		logger.WithSource(log, "cmd/cyrene").Warn("capacity L3 cache ttl unparsable, using the default",
			"value", raw, "default", capacity.DefaultL3CacheTTL.String(), "error", err)
		return capacity.DefaultL3CacheTTL
	}
	return d
}

// parseCapacityToolSets decodes the CAPACITY_TOOL_SETS JSON map of
// state→allowed tool name list. A blank string yields nil (built-in defaults); a
// null value for a state means unrestricted (all tools).
func parseCapacityToolSets(raw string) (map[capacity.State][]string, error) {
	if strings.TrimSpace(raw) == "" {
		return nil, nil
	}
	var m map[string][]string
	if err := json.Unmarshal([]byte(raw), &m); err != nil {
		return nil, fmt.Errorf("capacity tool sets: %w", err)
	}
	out := make(map[capacity.State][]string, len(m))
	for k, v := range m {
		out[capacity.State(k)] = v
	}
	return out, nil
}

// defaultAwakening 取当前主角色（`configs/users/owner.yaml` 的 `defaultPersona`，
// 未配置时回落 `cyrene`）档案里的 `awakening` 块。它填的是决策层的**全局兜底**
// （capacity.Config.Awakening）；每个 turn 真正生效的档位由 awakeningFor 按该
// turn 的角色解析（裁决 14.4.3 的后半）。两者共用同一处映射，因此「全局兜底」
// 与「按角色取值」的口径绝不会分叉。
//
// 未装配人格注册表（降级启动 / 单测构造的 app）时返回零值 —— 注册表缺席时连
// 默认角色都问不出来，此时不补任何档位。
func (a *app) defaultAwakening() capacity.Awakening {
	if a.personas == nil {
		return capacity.Awakening{}
	}
	return a.awakeningFor(a.defaultPersonaID())
}

// awakeningFor 取**该角色**档案里的 `awakening` 块，映射为决策层的人格档位覆盖
// （design/14 §3，裁决 14.4.3）。它是 loop.Options.PersonaAwakening 的实现：循环
// 每个 turn 按该 turn 的角色 id 调它，因此绑定非默认角色的会话用**自己**的档位
// 判定能力面，而不是只吃默认角色的全局兜底。
//
// 下列情形一律返回零值 = **无覆盖**，由决策层走全局默认（Config.Awakening +
// 全局阈值），绝不在此处凭空补档位：
//   - 尚未装配人格注册表（降级启动 / 单测构造的 app）；
//   - 角色 id 为空或该角色不在注册表里（未知/已删除人格）；
//   - 该角色档案里没写 `awakening` 块（缺席就是没有）。
//
// 档位是倾向/呈现，不是能力边界——它只影响本轮暴露的工具面与唤醒阈值。
func (a *app) awakeningFor(personaID string) capacity.Awakening {
	if a.personas == nil || personaID == "" {
		return capacity.Awakening{}
	}
	p, ok := a.personas.Persona(personaID)
	if !ok || p == nil {
		return capacity.Awakening{}
	}
	return a.awakeningOf(p)
}

// awakeningOf 把一份人格档案的 `awakening` 块映射为决策层的档位覆盖。映射不了
// 的档位名按「无该档位」处理（awakeningStateOf 会告警），因此非法值绝不会被塞进
// 决策层（未知态会落进「不受限工具集」分支）。
func (a *app) awakeningOf(p *loader.Persona) capacity.Awakening {
	if p == nil || p.Awakening == nil {
		return capacity.Awakening{}
	}
	aw := capacity.Awakening{
		DefaultState: a.awakeningStateOf(p.Awakening.DefaultState, p.ID, "default_state"),
	}
	if ov := p.Awakening.Overrides; ov != nil {
		aw.MinConfidence = ov.MinConfidence
		aw.ForceState = a.awakeningStateOf(ov.ForceState, p.ID, "overrides.force_state")
	}
	return aw
}

// awakeningStateOf 映射单个档位字面量；映射不了就**告警**再按「无该档位」处理。
// 经 loader.Load 进来的人格不可能走到告警分支（载入期已归一化并拒绝非法值），
// 因此它是给「代码构造的人格」留的响铃：宁可吵一声，也不让配置静默失效
// （design/01 §2.1 禁止静默无效的配置）。
func (a *app) awakeningStateOf(raw, personaID, field string) capacity.State {
	if raw == "" {
		return ""
	}
	state := awakeningState(raw)
	if state == "" {
		logger.WithSource(a.log, "cmd/cyrene").Warn("capacity awakening state unrecognized, treated as no override",
			"value", raw, "field", field, "persona", personaID)
	}
	return state
}

// awakeningState 把 loader 归一化后的档位名映射到决策层的态。空串（未声明、或未知
// 值）返回零值态——映射层不做默认填充，缺失的档位就是缺失。
func awakeningState(raw string) capacity.State {
	switch raw {
	case loader.AwakeningStateQuiet:
		return capacity.StateQuiet
	case loader.AwakeningStateAwake:
		return capacity.StateAwake
	case loader.AwakeningStateFull:
		return capacity.StateFull
	default:
		return ""
	}
}

// onCapacity is the loop's OnCapacity sink: it observes a capacity_awaken
// transition and pushes it to the Web UI (design/14 §5) as a `capacity_awaken`
// frame. The loop only emits on a real state transition (never every round), and
// the event carries the originating session id so it routes to that session, not
// globally. The payload is the frontend AwakenPayload {fromState,toState,tool}.
func (a *app) onCapacity(ev capacity.Event) {
	logger.WithSource(a.log, "cmd/cyrene").Debug("capacity event",
		"type", ev.Type, "from", ev.FromState, "to", ev.ToState,
		"tool", ev.Tool, "at", ev.At, "session", ev.SessionID)
	if a.capacitySink == nil {
		return
	}
	a.capacitySink.BroadcastCapacityAwaken(ev.SessionID, string(ev.FromState), string(ev.ToState), ev.Tool)
}