package executor

import (
	"context"
	"errors"
	"testing"

	"github.com/thepeterstone/claudomator/internal/event"
	"github.com/thepeterstone/claudomator/internal/storage"
	"github.com/thepeterstone/claudomator/internal/task"
)

type fakeChannelStore struct {
	createdTasks  []*task.Task
	createdEvents []*event.Event
	createTaskErr error
}

func (f *fakeChannelStore) CreateTask(t *task.Task) error {
	if f.createTaskErr != nil {
		return f.createTaskErr
	}
	f.createdTasks = append(f.createdTasks, t)
	return nil
}

func (f *fakeChannelStore) CreateEvent(e *event.Event) error {
	f.createdEvents = append(f.createdEvents, e)
	return nil
}

func TestStoreChannel_AskUser_ReturnsBlocked(t *testing.T) {
	ch := newStoreChannel(&fakeChannelStore{}, "task-1", &storage.Execution{})
	answer, err := ch.AskUser(context.Background(), `{"text":"q"}`)
	if !errors.Is(err, ErrAgentBlocked) {
		t.Errorf("expected ErrAgentBlocked, got %v", err)
	}
	if answer != "" {
		t.Errorf("expected empty answer, got %q", answer)
	}
}

func TestStoreChannel_ReportSummary_BuffersOntoExec(t *testing.T) {
	e := &storage.Execution{}
	ch := newStoreChannel(&fakeChannelStore{}, "task-1", e)
	if err := ch.ReportSummary(context.Background(), "did the thing"); err != nil {
		t.Fatalf("ReportSummary: %v", err)
	}
	if e.Summary != "did the thing" {
		t.Errorf("expected exec.Summary set, got %q", e.Summary)
	}
}

func TestStoreChannel_ReportSummary_NilExec(t *testing.T) {
	ch := newStoreChannel(&fakeChannelStore{}, "task-1", nil)
	if err := ch.ReportSummary(context.Background(), "x"); err != nil {
		t.Errorf("expected nil err with nil exec, got %v", err)
	}
}

func TestStoreChannel_SpawnSubtask_CreatesChildWithParent(t *testing.T) {
	store := &fakeChannelStore{}
	ch := newStoreChannel(store, "parent-1", &storage.Execution{})
	id, err := ch.SpawnSubtask(context.Background(), SubtaskSpec{
		Name:         "child",
		Instructions: "do it",
		Model:        "sonnet",
		MaxBudgetUSD: 1.5,
	})
	if err != nil {
		t.Fatalf("SpawnSubtask: %v", err)
	}
	if id == "" {
		t.Error("expected non-empty subtask ID")
	}
	if len(store.createdTasks) != 1 {
		t.Fatalf("expected 1 created task, got %d", len(store.createdTasks))
	}
	ct := store.createdTasks[0]
	if ct.ParentTaskID != "parent-1" {
		t.Errorf("ParentTaskID: got %q want parent-1", ct.ParentTaskID)
	}
	if ct.ID != id {
		t.Errorf("returned id %q != created task id %q", id, ct.ID)
	}
	if ct.Agent.Instructions != "do it" || ct.Agent.Model != "sonnet" || ct.Agent.MaxBudgetUSD != 1.5 {
		t.Errorf("agent config not propagated: %+v", ct.Agent)
	}
	if ct.State != task.StatePending {
		t.Errorf("expected PENDING child, got %s", ct.State)
	}
}

func TestStoreChannel_SpawnSubtask_PropagatesError(t *testing.T) {
	store := &fakeChannelStore{createTaskErr: errors.New("boom")}
	ch := newStoreChannel(store, "parent-1", &storage.Execution{})
	if _, err := ch.SpawnSubtask(context.Background(), SubtaskSpec{Name: "x"}); err == nil {
		t.Error("expected error from CreateTask")
	}
}

func TestStoreChannel_RecordProgress_EmitsAgentMessage(t *testing.T) {
	store := &fakeChannelStore{}
	ch := newStoreChannel(store, "task-1", &storage.Execution{})
	if err := ch.RecordProgress(context.Background(), "halfway done"); err != nil {
		t.Fatalf("RecordProgress: %v", err)
	}
	if len(store.createdEvents) != 1 {
		t.Fatalf("expected 1 event, got %d", len(store.createdEvents))
	}
	e := store.createdEvents[0]
	if e.Kind != event.KindAgentMessage || e.Actor != event.ActorAgent {
		t.Errorf("got kind=%v actor=%v want agent_message/agent", e.Kind, e.Actor)
	}
	if e.TaskID != "task-1" {
		t.Errorf("TaskID: got %q want task-1", e.TaskID)
	}
}