package agents

import (
	"context"
	"path/filepath"
	"testing"
	"time"

	"g.fc.run/misc/byre/internal/api"
	"g.fc.run/misc/byre/internal/claude"
	"g.fc.run/misc/byre/internal/store"
)

func TestSubagentEvents(t *testing.T) {
	ctx := context.Background()
	st, err := store.Open(filepath.Join(t.TempDir(), "byre.db"), store.DefaultPortFirst, func(api.Event) {})
	if err != nil {
		t.Fatalf("open store: %v", err)
	}
	t.Cleanup(func() { st.Close() })

	now := time.Now().UTC()
	_, err = st.EnsureUser(ctx, "alice", "Alice")
	if err != nil {
		t.Fatalf("ensure user: %v", err)
	}
	err = st.CreateProject(ctx, api.Project{Id: "p1", Name: "demo", RepoPath: "/nonexistent", DefaultBranch: "main", Remote: "none", CreatedBy: "alice", CreatedAt: now})
	if err != nil {
		t.Fatalf("create project: %v", err)
	}
	err = st.CreateTask(ctx, api.Task{Id: "t1", ProjectId: "p1", Title: "t", Branch: "b", WorktreePath: "/nonexistent", BaseRef: "x", Status: api.TaskStatusActive, CreatedBy: "alice", CreatedAt: now}, "alice")
	if err != nil {
		t.Fatalf("create task: %v", err)
	}

	m := New(st, DefaultLimits, t.TempDir(), t.TempDir())
	l := &live{id: "s1", dir: t.TempDir(), vendor: api.Claude, taskID: "t1", projectID: "p1"}

	feed := func(typ, raw string) {
		t.Helper()
		err := m.handle(ctx, l, claude.Event{Type: typ, Raw: []byte(raw)})
		if err != nil {
			t.Fatalf("handle %s: %v", raw, err)
		}
	}

	feed("assistant", `{"type":"assistant","message":{"model":"m","content":[{"type":"tool_use","id":"toolu_agent","name":"Agent","input":{"subagent_type":"general-purpose","description":"d","prompt":"p"}}],"usage":{"input_tokens":2,"cache_read_input_tokens":100,"output_tokens":17}},"parent_tool_use_id":null}`)
	feed("assistant", `{"type":"assistant","message":{"model":"m","content":[{"type":"tool_use","id":"toolu_bash","name":"Bash","input":{"command":"ls"}}],"usage":{"input_tokens":2,"cache_creation_input_tokens":33494,"output_tokens":20}},"parent_tool_use_id":"toolu_agent","agent_id":"a1"}`)
	feed("user", `{"type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_bash","type":"tool_result","content":"adsb-tools","is_error":false}]},"parent_tool_use_id":"toolu_agent","agent_id":"a1"}`)
	feed("assistant", `{"type":"assistant","message":{"model":"m","content":[{"type":"text","text":"The first entry is adsb-tools."}],"usage":{"input_tokens":2,"output_tokens":3}},"parent_tool_use_id":"toolu_agent","agent_id":"a1"}`)

	events, err := st.TaskEvents(ctx, "t1", 0, 100)
	if err != nil {
		t.Fatalf("task events: %v", err)
	}
	got := []string{}
	for _, ev := range events {
		if ev.AgentSessionId == nil {
			continue
		}
		parent, _ := ev.Payload["parent_tool_use_id"].(string)
		got = append(got, ev.Kind+" "+parent)
	}
	want := []string{
		"agent.tool_call ",
		"session.context ",
		"agent.tool_call toolu_agent",
		"agent.tool_result toolu_agent",
		"agent.message toolu_agent",
	}
	if len(got) != len(want) {
		t.Fatalf("want %q, got %q", want, got)
	}
	for i := range want {
		if got[i] != want[i] {
			t.Fatalf("want %q, got %q", want, got)
		}
	}
	if l.contextUsed != 119 {
		t.Fatalf("subagent usage changed the session's context: %d", l.contextUsed)
	}
}