package quota

import (
	"testing"

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

// mockTmux for quota tests.
type mockTmux struct {
	sessions   map[string]bool
	paneOutput map[string]string
}

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

func (m *mockTmux) HasSession(name string) bool        { return m.sessions[name] }
func (m *mockTmux) CreateSession(name, _ string) error { m.sessions[name] = true; return nil }
func (m *mockTmux) KillSession(_ string) error         { return nil }
func (m *mockTmux) SendKeys(_, _ string) error         { return nil }
func (m *mockTmux) CapturePaneTail(session string, _ int) (string, error) {
	return m.paneOutput[session], nil
}

// TestIsQuotaExhausted verifies pattern matching on pane output.
func TestIsQuotaExhausted(t *testing.T) {
	cases := []struct {
		input string
		want  bool
	}{
		{"You've hit your limit for Claude Pro.", true},
		{"rate limit exceeded", true},
		{"quota exceeded for this period", true},
		{"Usage limit reached", true},
		{"Too many requests", true},
		{"Some normal output ❯", false},
		{"❯ ", false},
		{"still running 5s · ", false},
	}
	for _, c := range cases {
		if got := isQuotaExhausted(c.input); got != c.want {
			t.Errorf("isQuotaExhausted(%q) = %v, want %v", c.input, got, c.want)
		}
	}
}

// TestExtractResetTime parses various reset time formats.
func TestExtractResetTime(t *testing.T) {
	cases := []struct {
		input string
		want  string
	}{
		{"Usage resets 8pm", "8pm"},
		{"Your quota resets at 11:30pm", "11:30pm"},
		{"resets in 45 minutes", "in 45 minutes"},
		{"resets in 2 hours", "in 2 hours"},
		{"no reset info here", ""},
	}
	for _, c := range cases {
		if got := extractResetTime(c.input); got != c.want {
			t.Errorf("extractResetTime(%q) = %q, want %q", c.input, got, c.want)
		}
	}
}

// TestPollTriggersSwitchOnTwoBlockedPool verifies swap trigger for >=2 blocked pool sessions.
func TestPollTriggersSwitchOnTwoBlockedPool(t *testing.T) {
	tc := newMockTmux()
	tc.sessions["ccl-auto-0"] = true
	tc.sessions["ccl-auto-1"] = true
	tc.paneOutput["ccl-auto-0"] = "You've hit your limit for Claude Pro."
	tc.paneOutput["ccl-auto-1"] = "rate limit exceeded"

	s := state.New("")
	s.SetActiveAccount("compte1")

	cfg := &config.Config{
		Pool: config.PoolConfig{
			Autonomous: config.AutonomousConfig{Prefix: "ccl-auto-", Max: 2},
		},
	}
	m := New(tc, s, cfg)
	m.poll()

	select {
	case req := <-m.switchCh:
		if req.From != "compte1" {
			t.Errorf("expected From=compte1, got %q", req.From)
		}
	default:
		t.Fatal("expected SwitchRequest on channel")
	}
}

// TestPollTriggersSwitchOnOneBlockedInteractive verifies swap trigger for >=1 dedicated session.
func TestPollTriggersSwitchOnOneBlockedInteractive(t *testing.T) {
	tc := newMockTmux()
	tc.sessions["my-session"] = true
	tc.paneOutput["my-session"] = "quota exceeded"

	s := state.New("")
	s.SetActiveAccount("compte1")

	cfg := &config.Config{
		Pool: config.PoolConfig{
			Dedicated:  []config.DedicatedSession{{Name: "my-session"}},
			Autonomous: config.AutonomousConfig{Max: 0},
		},
	}
	m := New(tc, s, cfg)
	m.poll()

	select {
	case req := <-m.switchCh:
		if req.From != "compte1" {
			t.Errorf("expected From=compte1, got %q", req.From)
		}
	default:
		t.Fatal("expected SwitchRequest on channel")
	}
}

// TestPollNoTriggerWhenBelowThreshold verifies no swap for a single blocked pool session.
func TestPollNoTriggerWhenBelowThreshold(t *testing.T) {
	tc := newMockTmux()
	tc.sessions["ccl-auto-0"] = true
	tc.sessions["ccl-auto-1"] = true
	tc.paneOutput["ccl-auto-0"] = "rate limit exceeded"
	tc.paneOutput["ccl-auto-1"] = "❯ " // fine

	s := state.New("")
	cfg := &config.Config{
		Pool: config.PoolConfig{
			Autonomous: config.AutonomousConfig{Prefix: "ccl-auto-", Max: 2},
		},
	}
	m := New(tc, s, cfg)
	m.poll()

	select {
	case req := <-m.switchCh:
		t.Errorf("unexpected SwitchRequest: %+v", req)
	default:
		// Correct: only 1 blocked pool session, threshold is 2.
	}
}