package lifecycle

import (
	"testing"

	"forge.secuaas.ovh/olivier/claude-failover/internal/config"
	"forge.secuaas.ovh/olivier/claude-failover/internal/state"
)

// mockTmux is a minimal in-memory implementation of tmux.Client for tests.
type mockTmux struct {
	sessions       map[string]bool
	createCalls    []string
	killCalls      []string
	sendKeysCalls  []string
}

func newMockTmux() *mockTmux {
	return &mockTmux{sessions: make(map[string]bool)}
}

func (m *mockTmux) HasSession(name string) bool {
	return m.sessions[name]
}

func (m *mockTmux) CreateSession(name, workdir string) error {
	m.sessions[name] = true
	m.createCalls = append(m.createCalls, name)
	return nil
}

func (m *mockTmux) KillSession(name string) error {
	delete(m.sessions, name)
	m.killCalls = append(m.killCalls, name)
	return nil
}

func (m *mockTmux) SendKeys(session, keys string) error {
	m.sendKeysCalls = append(m.sendKeysCalls, session)
	return nil
}

func (m *mockTmux) SendEnter(session string) error {
	m.sendKeysCalls = append(m.sendKeysCalls, session)
	return nil
}

func (m *mockTmux) CapturePaneTail(session string, lines int) (string, error) {
	return "", nil
}

// minimalConfig returns a config with one dedicated session and no autonomous pool.
func minimalConfig(sessionName, project string) *config.Config {
	return &config.Config{
		Pool: config.PoolConfig{
			Dedicated: []config.DedicatedSession{
				{Name: sessionName, Project: project},
			},
			Autonomous: config.AutonomousConfig{
				Prefix: "ccl-auto-",
				Min:    0,
				Max:    0,
			},
		},
	}
}

// TestReconcileCreatesDeadSession verifies that when a session is absent and
// its state is idle, reconcile recreates it.
func TestReconcileCreatesDeadSession(t *testing.T) {
	tc := newMockTmux()
	// Session does NOT exist in tmux.
	tc.sessions["my-session"] = false

	s := state.New("/tmp/test-state-idle.json")
	s.SetIdle("my-session")

	cfg := minimalConfig("my-session", "/tmp/project")
	m := New(tc, s, cfg)
	m.reconcile()

	if len(tc.createCalls) != 1 || tc.createCalls[0] != "my-session" {
		t.Errorf("expected CreateSession(my-session) to be called once; createCalls=%v", tc.createCalls)
	}
	if got := s.GetSession("my-session"); got == nil || got.State != "idle" {
		t.Errorf("expected session state idle after recreate, got %v", got)
	}
}

// TestReconcileRecoversCrashedSession verifies that a missing session whose
// state is "working" gets marked failed before being recreated.
func TestReconcileRecoversCrashedSession(t *testing.T) {
	tc := newMockTmux()
	// Session does NOT exist in tmux but was working.
	tc.sessions["worker"] = false

	s := state.New("/tmp/test-state-working.json")
	s.SetWorking("worker", "task-abc")

	cfg := minimalConfig("worker", "")
	m := New(tc, s, cfg)
	m.reconcile()

	if len(tc.createCalls) != 1 || tc.createCalls[0] != "worker" {
		t.Errorf("expected CreateSession(worker) once after recovery; createCalls=%v", tc.createCalls)
	}
	// State should transition: working -> failed -> idle (SetIdle called after recreate).
	got := s.GetSession("worker")
	if got == nil {
		t.Fatal("session state is nil after recovery")
	}
	if got.State != "idle" {
		t.Errorf("expected session state idle after recovery, got %q", got.State)
	}
	if got.LastFail == nil {
		t.Error("expected LastFail to be set after SetFailed was called")
	}
}

// TestEnsureAllSessions verifies that EnsureAllSessions creates all sessions
// that are missing from tmux.
func TestEnsureAllSessions(t *testing.T) {
	tc := newMockTmux()
	// None of the sessions exist yet.

	s := state.New("/tmp/test-state-ensure.json")
	cfg := &config.Config{
		Pool: config.PoolConfig{
			Dedicated: []config.DedicatedSession{
				{Name: "sess-a", Project: "/tmp/a"},
				{Name: "sess-b", Project: "/tmp/b"},
			},
			Autonomous: config.AutonomousConfig{
				Prefix: "auto-",
				Min:    2,
				Max:    5,
			},
		},
	}

	m := New(tc, s, cfg)
	m.EnsureAllSessions()

	// Expect: sess-a, sess-b, auto-0, auto-1 = 4 sessions created.
	if len(tc.createCalls) != 4 {
		t.Errorf("expected 4 CreateSession calls, got %d: %v", len(tc.createCalls), tc.createCalls)
	}

	want := map[string]bool{"sess-a": true, "sess-b": true, "auto-0": true, "auto-1": true}
	for _, name := range tc.createCalls {
		if !want[name] {
			t.Errorf("unexpected session created: %q", name)
		}
	}
}