package gateway

import (
	"strings"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/bus"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/model"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/orchestration"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/runtime/orchestration/comm"
)

// eventBridge maps a producer bus subject to its outbound WS event type. The hub
// subscribes to these (and re-normalizes into ws.* types) so the frontend's
// existing consumers light up without the producers changing their subjects.
var eventBridge = map[string]string{
	"iot.device_update": "device_update",
	"task.output":       "task_output",
	"task.done":         "task_done",
	"automation.result": "automation_result",
	"reminder.trigger":  "reminder",
}

// bridgePatterns are the additional bus patterns the hub subscribes to on top of
// ws.> to capture producer events and normalize them for WS delivery.
var bridgePatterns = []string{
	"iot.>",
	"task.>",
	"automation.>",
	"reminder.>",
	"cyrene.agent.*.event",
}

// normalizeEvent maps a bus event to an outbound wsEvent. A ws.* subject keeps
// its design type (the ws. prefix is stripped); a known producer subject is
// bridged to its ws.* type; a sub-agent progress event is shaped into
// ws.subagent_event. It returns ok=false for events that have no WS-visible
// representation (e.g. internal cyrene.agent ask/reply traffic).
func normalizeEvent(e bus.Event) (wsEvent, bool) {
	if typ, ok := eventBridge[e.Subject]; ok {
		return wsEvent{Type: typ, Data: e.Payload}, true
	}
	if strings.HasPrefix(e.Subject, wsPrefix) {
		return wsEvent{Type: eventType(e.Subject), Data: e.Payload}, true
	}
	if ev, ok := subagentProgressEvent(e); ok {
		return ev, true
	}
	return wsEvent{}, false
}

// subagentProgressEvent maps an orchestration progress event — broadcast on
// cyrene.agent.<from>.event via comm.PublishEvent — into a ws.subagent_event
// frame. Only the five sub-agent progress names are surfaced; any other event
// broadcast on the same subject (ask/reply/addressed events, or foreign event
// names) is ignored so internal agent-to-agent traffic stays internal.
func subagentProgressEvent(e bus.Event) (wsEvent, bool) {
	if !isBroadcastAgentEvent(e.Subject) {
		return wsEvent{}, false
	}
	ev, ok := e.Payload.(comm.Event)
	if !ok {
		return wsEvent{}, false
	}
	switch ev.Name {
	case orchestration.EventDispatched, orchestration.EventStarted,
		orchestration.EventDone, orchestration.EventFailed, orchestration.EventAborted:
	default:
		return wsEvent{}, false
	}
	p, ok := ev.Data.(orchestration.Progress)
	if !ok {
		return wsEvent{}, false
	}
	return wsEvent{Type: "subagent_event", Data: map[string]any{
		"id":     p.AgentID,
		"name":   p.AgentID,
		"status": string(p.Status),
		"role":   p.RoleID,
		"mode":   p.Mode,
	}}, true
}

// streamEventData maps a streamed model.StreamKind to its downstream WS event
// type and builds a typed data payload. It is what turns the loop's structured
// events into the message.*/thinking.*/tool_call.*/tool_execution.* frames the
// frontend renders. Unknown kinds fall back to the legacy stream_chunk shape so
// an unrecognized event still reaches the client instead of being dropped.
func streamEventData(ev model.StreamEvent) (string, map[string]any) {
	switch ev.Kind {
	case model.StreamKindTextStart:
		return "message.start", map[string]any{"index": ev.Index}
	case model.StreamKindTextDelta:
		return "message.delta", map[string]any{"delta": ev.Delta, "index": ev.Index}
	case model.StreamKindTextEnd:
		return "message.end", map[string]any{"index": ev.Index}
	case model.StreamKindThinkingStart:
		return "thinking.start", map[string]any{"index": ev.Index}
	case model.StreamKindThinkingDelta:
		return "thinking.delta", map[string]any{"delta": ev.Delta, "index": ev.Index}
	case model.StreamKindThinkingEnd:
		return "thinking.end", map[string]any{"index": ev.Index}
	case model.StreamKindToolCallStart:
		return "tool_call.start", map[string]any{"id": ev.ID, "index": ev.Index}
	case model.StreamKindToolCallDelta:
		return "tool_call.delta", map[string]any{"id": ev.ID, "index": ev.Index, "delta": ev.Delta}
	case model.StreamKindToolCallEnd:
		return "tool_call.end", map[string]any{"id": ev.ID, "index": ev.Index}
	case model.StreamKindToolExecution:
		return "tool_execution.update", map[string]any{"id": ev.ID, "index": ev.Index, "delta": ev.Delta}
	default:
		return "stream_chunk", map[string]any{"delta": ev.Delta}
	}
}

// isBroadcastAgentEvent reports whether subject has the exact 4-token broadcast
// shape cyrene.agent.<from>.event, which is how the scheduler publishes progress.
// It deliberately does not match addressed events (cyrene.agent.<from>.<to>.event)
// or the ask/reply subjects.
func isBroadcastAgentEvent(subject string) bool {
	parts := strings.Split(subject, ".")
	if len(parts) != 4 {
		return false
	}
	return parts[0] == "cyrene" && parts[1] == "agent" && parts[3] == "event"
}