package orchestration

import (
	"context"
	"errors"
	"fmt"
	"runtime"
	"strings"
	"testing"
	"time"

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

func TestJoinMergesResults(t *testing.T) {
	t.Parallel()
	s := newScheduler(t, Options{MaxParallel: 2})
	m := &mockRunner{result: &loop.Result{Text: "answer", Steps: 3, StopReason: "stop"}}
	s.runner = m

	ctx := context.Background()
	for i := 0; i < 3; i++ {
		if _, err := s.Spawn(ctx, AgentSpec{Goal: fmt.Sprintf("goal %d", i)}); err != nil {
			t.Fatalf("Spawn %d: %v", i, err)
		}
	}

	res, err := s.Join(ctx)
	if err != nil {
		t.Fatalf("Join: %v", err)
	}
	if res.Total != 3 || res.Succeeded != 3 || res.Failed != 0 || res.Aborted != 0 {
		t.Fatalf("merged = %d total / %d ok / %d failed / %d aborted, want 3/3/0/0",
			res.Total, res.Succeeded, res.Failed, res.Aborted)
	}
	if len(res.Agents) != 3 {
		t.Fatalf("Agents len = %d, want 3", len(res.Agents))
	}
	for _, a := range res.Agents {
		if a.Status != StatusDone {
			t.Fatalf("agent %s status = %s, want done", a.ID, a.Status)
		}
		if a.Summary == "" {
			t.Fatalf("agent %s has no summary", a.ID)
		}
		if a.Text != "answer" || a.Steps != 3 {
			t.Fatalf("agent %s result = text %q steps %d, want answer/3", a.ID, a.Text, a.Steps)
		}
	}
	if !strings.Contains(res.Summary, "3 成功") {
		t.Fatalf("merged summary = %q, want a 3-成功 aggregate", res.Summary)
	}
}

func TestFailureSummary(t *testing.T) {
	t.Parallel()
	s := newScheduler(t, Options{MaxParallel: 2})
	boom := errors.New("boom")
	m := &mockRunner{err: boom}
	s.runner = m

	sub, err := s.Spawn(context.Background(), AgentSpec{Goal: "x"})
	if err != nil {
		t.Fatalf("Spawn: %v", err)
	}
	waitFor(t, func() bool { return sub.Status() == StatusFailed }, waitTimeout)
	if !strings.Contains(sub.Summary(), "boom") {
		t.Fatalf("Summary = %q, want the failure recorded", sub.Summary())
	}
	if !errors.Is(sub.Err(), boom) {
		t.Fatalf("Err = %v, want boom", sub.Err())
	}
	if sub.Result() != nil {
		t.Fatalf("Result = %v, want nil on failure", sub.Result())
	}

	res, err := s.Join(context.Background())
	if err != nil {
		t.Fatalf("Join: %v", err)
	}
	if res.Total != 1 || res.Failed != 1 || res.Succeeded != 0 {
		t.Fatalf("merged = %d total / %d ok / %d failed, want 1/0/1",
			res.Total, res.Succeeded, res.Failed)
	}
}

func TestContextIsolation(t *testing.T) {
	t.Parallel()
	s := newScheduler(t, Options{MaxParallel: 1})
	m := &mockRunner{result: &loop.Result{Text: "done"}}
	s.runner = m

	specCtx := []model.Message{model.TextMessage(model.RoleUser, "hello")}
	sub, err := s.Spawn(context.Background(), AgentSpec{Goal: "x", Context: specCtx})
	if err != nil {
		t.Fatalf("Spawn: %v", err)
	}

	// Spawn 之后再改调用方的切片，不得泄漏进子代理。
	specCtx[0].Content[0].Text = "mutated"

	res, err := s.Join(context.Background())
	if err != nil {
		t.Fatalf("Join: %v", err)
	}
	if len(res.Agents) != 1 {
		t.Fatalf("Agents len = %d, want 1", len(res.Agents))
	}
	if m.total != 1 {
		t.Fatalf("runner calls = %d, want 1", m.total)
	}
	// runner 收到的是隔离后的调用方上下文，加上任务本身作为末尾一条 user 消息
	// （裁决 2026-10-04: 任务作为一条 user 消息注入）.
	got := m.captured(0)
	if len(got) != 2 {
		t.Fatalf("runner received %d messages, want the isolated context + the task message: %#v", len(got), got)
	}
	if got[0].Role != model.RoleUser || got[0].Content[0].Text != "hello" {
		t.Fatalf("runner context[0] = %+v, want the isolated 'hello' user message", got[0])
	}
	if got[1].Role != model.RoleUser || !strings.Contains(got[1].Content[0].Text, "x") {
		t.Fatalf("runner context[1] = %+v, want the task user message carrying the goal", got[1])
	}
	if sub.Context[0].Content[0].Text != "hello" {
		t.Fatalf("sub-agent context text = %q, want hello", sub.Context[0].Content[0].Text)
	}
}

func TestProgressEvents(t *testing.T) {
	t.Parallel()
	s := newScheduler(t, Options{MaxParallel: 1})
	gate := make(chan struct{})
	m := &mockRunner{gate: gate}
	s.runner = m

	listener := comm.New(s.Bus(), "main")
	events := make(chan comm.Event, 8)
	unsub, err := listener.SubscribeEvent(context.Background(), func(_ context.Context, e comm.Event) error {
		events <- e
		return nil
	})
	if err != nil {
		t.Fatalf("SubscribeEvent: %v", err)
	}
	defer unsub()

	if _, err := s.Spawn(context.Background(), AgentSpec{Goal: "x"}); err != nil {
		t.Fatalf("Spawn: %v", err)
	}
	waitFor(t, func() bool { return m.activeCount() >= 1 }, waitTimeout)
	close(gate)

	names := collectEventNames(t, events, waitTimeout)
	seen := make(map[string]bool)
	for _, n := range names {
		seen[n] = true
	}
	for _, want := range []string{EventDispatched, EventStarted, EventDone} {
		if !seen[want] {
			t.Fatalf("missing progress event %q, got %v", want, names)
		}
	}
}

func TestJoin_CanceledCtx(t *testing.T) {
	t.Parallel()
	s := newScheduler(t, Options{MaxParallel: 1, PerAgentTimeout: 2 * time.Second})
	m := &mockRunner{gate: make(chan struct{})}
	s.runner = m

	if _, err := s.Spawn(context.Background(), AgentSpec{Goal: "x"}); err != nil {
		t.Fatalf("Spawn: %v", err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 50*time.Millisecond)
	defer cancel()
	res, err := s.Join(ctx)
	if !errors.Is(err, context.DeadlineExceeded) {
		t.Fatalf("Join err = %v, want DeadlineExceeded", err)
	}
	if res == nil {
		t.Fatal("Join returned a nil merged result on canceled ctx")
	}
}

func TestApprove_NoApprover(t *testing.T) {
	t.Parallel()
	s := newScheduler(t, Options{})
	if _, err := s.Approve(context.Background(), "bob", "run", "do something"); !errors.Is(err, ErrNoApprover) {
		t.Fatalf("Approve err = %v, want ErrNoApprover", err)
	}
}

func TestSinkMemory_NoStore(t *testing.T) {
	t.Parallel()
	s := newScheduler(t, Options{})
	sub, err := s.Spawn(context.Background(), AgentSpec{Goal: "x"})
	if err != nil {
		t.Fatalf("Spawn: %v", err)
	}
	if _, err := s.SinkMemory(context.Background(), sub, "remember this", "persona", "relationship"); !errors.Is(err, ErrNoMemory) {
		t.Fatalf("SinkMemory err = %v, want ErrNoMemory", err)
	}
}

func TestRunWithRealLoop(t *testing.T) {
	t.Parallel()
	ad := &mockAdapter{resp: model.Response{Content: "final answer", Model: "mock"}}
	ag, err := agent.New("You are a helper.", nil, nil, agent.WithModel(ad, nil))
	if err != nil {
		t.Fatalf("agent.New: %v", err)
	}
	lp := loop.New(loop.Options{Agent: ag, MaxRounds: 3})
	s := newScheduler(t, Options{Loop: lp, MaxParallel: 2})

	sub, err := s.Spawn(context.Background(), AgentSpec{Goal: "x"})
	if err != nil {
		t.Fatalf("Spawn: %v", err)
	}
	waitFor(t, func() bool { return sub.Status() == StatusDone }, waitTimeout)
	if sub.Result() == nil {
		t.Fatal("real loop produced no result")
	}
	if sub.Result().Text != "final answer" {
		t.Fatalf("result text = %q, want final answer", sub.Result().Text)
	}

	res, err := s.Join(context.Background())
	if err != nil {
		t.Fatalf("Join: %v", err)
	}
	if res.Succeeded != 1 || res.Failed != 0 {
		t.Fatalf("merged = %d ok / %d failed, want 1 ok", res.Succeeded, res.Failed)
	}
}

func TestNoGoroutineLeak(t *testing.T) {
	// 不并行：goroutine 计数断言在并行测试下噪声很大。
	s := newScheduler(t, Options{MaxParallel: 2})
	m := &mockRunner{result: &loop.Result{Text: "ok"}}
	s.runner = m

	baseline := runtime.NumGoroutine()
	ctx := context.Background()
	for i := 0; i < 20; i++ {
		if _, err := s.Spawn(ctx, AgentSpec{Goal: fmt.Sprintf("g%d", i)}); err != nil {
			t.Fatalf("Spawn %d: %v", i, err)
		}
	}
	if _, err := s.Join(ctx); err != nil {
		t.Fatalf("Join: %v", err)
	}
	waitFor(t, func() bool { return runtime.NumGoroutine() <= baseline+5 }, waitTimeout)
}