package main

import (
	"log/slog"
	"time"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
	personareg "git.yeij.top/AskaEth/Cyrene_v2/internal/persona/registry"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/sessionread"
)

// wireSessionReadTool registers the design/22 §8-3 cross-session read tool, so the
// running role can pull another Web session's context as external, read-only
// material (design/22 §8.1).
//
// The capability is registered with its default reachability markers (both false),
// which keeps it owner-only: the design/11 §3 policy engine hides the schema from a
// group/stranger session and the loop's security gate rejects the call there. The
// tool's own fail-closed check (owner environment + the web/web:<uuid> whitelist)
// runs behind that gate, so an unauthorized read is refused twice over. The
// audit trail is the loop's gate/OnAudit, exactly as for every other tool — no
// bypass path is added here.
func (a *app) wireSessionReadTool() {
	log := logger.WithSource(a.log, "cmd/cyrene")
	if a.history == nil {
		log.Warn("session read tool skipped: no history store")
		return
	}
	if a.dispatcher == nil {
		log.Warn("session read tool skipped: no tool dispatcher")
		return
	}
	reader := sessionread.New(
		sessionread.WithHistory(a.history),
		sessionread.WithPersonas(sessionReadPersonas{reg: a.personas}),
		sessionread.WithLocation(a.sessionReadLocation(log)),
		sessionread.WithLogger(a.log),
	)
	if err := a.dispatcher.Register(reader); err != nil {
		log.Warn("session read tool register skipped", "error", err)
		return
	}
	log.Info("session read tool registered", "tool", sessionread.ToolName, "owner_only", true)
}

// sessionReadLocation resolves the configured IANA zone for the material's
// timestamps, so the external transcript reads in the same clock as the loop's
// per-round "current time" injection (internal/runtime/loop/time.go). An unset zone
// or one that fails to load returns nil, which keeps the tool's process-local
// default — the read must not fail over a display setting.
func (a *app) sessionReadLocation(log *slog.Logger) *time.Location {
	if a.cfg == nil || a.cfg.Timezone == "" {
		return nil
	}
	loc, err := time.LoadLocation(a.cfg.Timezone)
	if err != nil {
		log.Warn("session read tool timezone load failed; using the process-local zone",
			"tz", a.cfg.Timezone, "error", err)
		return nil
	}
	return loc
}

// sessionReadPersonas adapts the persona registry to sessionread.PersonaNamer. The
// tool package deliberately does not import internal/persona/registry (it holds a
// narrow interface instead, keeping the layering one-way), so the composition root
// supplies the display-name lookup.
type sessionReadPersonas struct {
	reg *personareg.Registry
}

// PersonaName implements sessionread.PersonaNamer: the persona's display name, or
// ok=false for an unknown/unregistered role so the tool shows the raw id rather
// than inventing a name.
func (p sessionReadPersonas) PersonaName(id string) (string, bool) {
	if p.reg == nil || id == "" {
		return "", false
	}
	persona, ok := p.reg.Persona(id)
	if !ok || persona == nil || persona.Name == "" {
		return "", false
	}
	return persona.Name, true
}

// DefaultPersonaID implements sessionread.PersonaNamer: the persona bound to the
// library's default character, mirroring (*app).defaultPersonaID. An empty id means
// the material renders the explicit "no role set" marker instead of guessing.
func (p sessionReadPersonas) DefaultPersonaID() string {
	if p.reg == nil {
		return ""
	}
	if c, ok := p.reg.DefaultCharacter(); ok && c != nil {
		return c.PersonaID
	}
	return ""
}