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, including
// the server-error veto that prevents 5xx from being mistaken for quota.
func TestIsQuotaExhausted(t *testing.T) {
	cases := []struct {
		name  string
		input string
		want  bool
	}{
		{"friendly hit message", "You've hit your limit for Claude Pro.", true},
		{"typed rate_limit_error", `{"error":{"type":"rate_limit_error"}}`, true},
		{"quota exceeded", "quota exceeded for this period", true},
		{"usage limit", "Usage limit reached", true},
		{"too many requests", "Too many requests", true},
		{"5-hour limit", "You've reached the 5-hour limit", true},

		{"normal output", "Some normal output ❯", false},
		{"empty prompt", "❯ ", false},
		{"status line", "still running 5s · ", false},

		// Server-error veto cases — these MUST NOT trigger a swap.
		{"api_error 500 veto", `API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"}} rate limit`, false},
		{"overloaded_error veto", `{"error":{"type":"overloaded_error"}} rate limit`, false},
		{"internal server error veto", "Internal Server Error — rate limit mentioned elsewhere", false},

		// Real 429 should still pass even if generic words are around.
		{"real rate_limit_error wins", `{"error":{"type":"rate_limit_error","message":"Rate limited"}}`, true},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			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)
		}
	}
}

// TestPollTriggersSwitchOnTwoBlockedPoolWithReset verifies a legitimate 429
// (reset time present) triggers a swap immediately on the first poll.
func TestPollTriggersSwitchOnTwoBlockedPoolWithReset(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. resets in 45 minutes"
	tc.paneOutput["ccl-auto-1"] = `{"error":{"type":"rate_limit_error"}} — resets at 8pm`

	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)
		}
		if req.ResetTime == "" {
			t.Errorf("expected non-empty ResetTime")
		}
	default:
		t.Fatal("expected SwitchRequest on channel")
	}
}

// TestPollRequiresConfirmationWhenNoResetTime verifies that a hit without a
// parseable reset time does not trigger a swap on a single poll. A second
// consecutive hit is required. This guards against transient Anthropic 500
// errors whose payload happens to contain "rate limit".
func TestPollRequiresConfirmationWhenNoResetTime(t *testing.T) {
	tc := newMockTmux()
	tc.sessions["my-session"] = true
	tc.paneOutput["my-session"] = "quota exceeded" // no reset time

	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)

	// First poll — suspected only, no swap yet.
	m.poll()
	select {
	case req := <-m.switchCh:
		t.Fatalf("unexpected SwitchRequest on first poll: %+v", req)
	default:
	}

	// Second poll — confirmed, swap emitted.
	m.poll()
	select {
	case req := <-m.switchCh:
		if req.From != "compte1" {
			t.Errorf("expected From=compte1, got %q", req.From)
		}
		if req.ResetTime != "" {
			t.Errorf("expected empty ResetTime, got %q", req.ResetTime)
		}
	default:
		t.Fatal("expected SwitchRequest on confirmation poll")
	}
}

// TestPollSuspectedHitClearedOnRecovery verifies a transient hit followed by
// a clean poll does NOT trigger a swap on a subsequent hit — the suspected
// state must be reset when detection clears.
func TestPollSuspectedHitClearedOnRecovery(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() // suspected
	tc.paneOutput["my-session"] = "all good ❯ "
	m.poll() // cleared
	tc.paneOutput["my-session"] = "quota exceeded"
	m.poll() // re-suspected, NOT confirmed yet

	select {
	case req := <-m.switchCh:
		t.Fatalf("unexpected SwitchRequest after recovery: %+v", req)
	default:
	}
}

// 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"] = "You've hit your limit"
	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.
	}
}