package capabilities

import (
	"testing"

	"git.gobha.me/xcaliber/chat-switchboard/models"
)

func TestLookupKnownModel_AlwaysFalse(t *testing.T) {
	// Known table removed in 0.9.1 — function is a no-op stub for interface compat
	_, ok := LookupKnownModel("gpt-4o")
	if ok {
		t.Error("LookupKnownModel should always return false (table removed)")
	}
	_, ok = LookupKnownModel("claude-sonnet-4-20250514")
	if ok {
		t.Error("LookupKnownModel should always return false (table removed)")
	}
}

func TestInferCapabilities_ToolCalling(t *testing.T) {
	tests := []struct {
		model string
		want  bool
	}{
		{"llama-3.1-70b-instruct", true},
		{"mistral-7b", true},
		{"qwen-2.5-72b", true},
		{"qwen3-235b-a22b-thinking", true},
		{"phi-3-mini", true},
		{"gpt-4o", true},
		{"claude-sonnet-4-20250514", true},
		{"gemini-2.5-pro", true},
		{"grok-41-fast", true},
		{"kimi-k2-thinking", true},
		{"minimax-m2.5", true},
		{"random-smallmodel", false},
	}
	for _, tt := range tests {
		caps := InferCapabilities(tt.model)
		if caps.ToolCalling != tt.want {
			t.Errorf("InferCapabilities(%q).ToolCalling = %v, want %v", tt.model, caps.ToolCalling, tt.want)
		}
	}
}

func TestInferCapabilities_Vision(t *testing.T) {
	tests := []struct {
		model string
		want  bool
	}{
		{"llava-v1.6-34b", true},
		{"gemini-2.5-flash", true},
		{"claude-opus-4-20250514", true},
		{"claude-sonnet-4-20250514", true},
		{"gpt-4o", true},
		{"gemma-3-27b", true},
		{"grok-41-fast", true},
		{"deepseek-r1", false},
		{"llama-3.1-70b", false},
	}
	for _, tt := range tests {
		caps := InferCapabilities(tt.model)
		if caps.Vision != tt.want {
			t.Errorf("InferCapabilities(%q).Vision = %v, want %v", tt.model, caps.Vision, tt.want)
		}
	}
}

func TestInferCapabilities_Reasoning(t *testing.T) {
	tests := []struct {
		model string
		want  bool
	}{
		{"deepseek-r1-distill-llama-70b", true},
		{"qwq-32b", true},
		{"o3-mini", true},
		{"qwen3-235b-a22b-thinking-2507", true},
		{"grok-41-fast", true},
		{"glm-5-32b", true},
		{"gpt-4o", false},
		{"llama-3.1-70b", false},
	}
	for _, tt := range tests {
		caps := InferCapabilities(tt.model)
		if caps.Reasoning != tt.want {
			t.Errorf("InferCapabilities(%q).Reasoning = %v, want %v", tt.model, caps.Reasoning, tt.want)
		}
	}
}

func TestInferCapabilities_CodeOptimized(t *testing.T) {
	tests := []struct {
		model string
		want  bool
	}{
		{"codestral", true},
		{"deepseek-coder-33b", true},
		{"qwen3-coder-480b", true},
		{"starcoder2-15b", true},
		{"gpt-4o", false},
		{"llama-3.1-70b", false},
	}
	for _, tt := range tests {
		caps := InferCapabilities(tt.model)
		if caps.CodeOptimized != tt.want {
			t.Errorf("InferCapabilities(%q).CodeOptimized = %v, want %v", tt.model, caps.CodeOptimized, tt.want)
		}
	}
}

func TestResolveMaxOutput_FromCaps(t *testing.T) {
	caps := models.ModelCapabilities{MaxOutputTokens: 32000}
	got := ResolveMaxOutput("whatever-model", caps)
	if got != 32000 {
		t.Errorf("got %d, want 32000", got)
	}
}

func TestResolveMaxOutput_FromContext(t *testing.T) {
	caps := models.ModelCapabilities{MaxContext: 32768}
	got := ResolveMaxOutput("unknown-model-abc", caps)
	if got != 4096 {
		t.Errorf("got %d, want 4096 (derived from context/8)", got)
	}
}

func TestResolveMaxOutput_ContextClamp(t *testing.T) {
	caps := models.ModelCapabilities{MaxContext: 1048576}
	got := ResolveMaxOutput("unknown-large-model", caps)
	if got != 16384 {
		t.Errorf("got %d, want 16384 (clamped)", got)
	}

	caps = models.ModelCapabilities{MaxContext: 4096}
	got = ResolveMaxOutput("unknown-tiny-model", caps)
	if got != 2048 {
		t.Errorf("got %d, want 2048 (clamped)", got)
	}
}

func TestResolveMaxOutput_LastResort(t *testing.T) {
	caps := models.ModelCapabilities{}
	got := ResolveMaxOutput("mystery-model", caps)
	if got != 4096 {
		t.Errorf("got %d, want 4096 (last resort)", got)
	}
}

func TestResolveIntrinsic_CatalogWins(t *testing.T) {
	// Provider reports tool_calling and max_output — authoritative.
	// Heuristic should fill vision for claude (regex match).
	providerCaps := models.ModelCapabilities{
		ToolCalling:     true,
		MaxOutputTokens: 16384,
	}
	merged := ResolveIntrinsic("claude-sonnet-4-20250514", &providerCaps)

	if !merged.ToolCalling {
		t.Error("tool_calling should be preserved from provider")
	}
	if merged.MaxOutputTokens != 16384 {
		t.Errorf("max_output should be 16384 from provider, got %d", merged.MaxOutputTokens)
	}
	if !merged.Vision {
		t.Error("vision should be filled from heuristic (claude-sonnet matches)")
	}
}

func TestResolveIntrinsic_ProviderDataPreserved(t *testing.T) {
	// Provider says no vision — heuristic shouldn't override.
	// mergeGaps only fills false→true, never overrides true→false.
	// But: provider set vision=false explicitly. Since mergeGaps uses
	// "fill zero", and false IS zero, heuristic CAN fill it.
	// This is the expected behavior: heuristic is additive best-effort.
	providerCaps := models.ModelCapabilities{
		ToolCalling:     true,
		Vision:          false,
		MaxOutputTokens: 8192,
		MaxContext:       65536,
	}
	merged := ResolveIntrinsic("some-unknown-model", &providerCaps)

	if !merged.ToolCalling {
		t.Error("tool_calling should be preserved from provider")
	}
	if merged.MaxContext != 65536 {
		t.Errorf("max_context should be preserved from provider, got %d", merged.MaxContext)
	}
}

func TestResolveIntrinsic_NilProvider(t *testing.T) {
	// Nil provider caps — falls through entirely to heuristic
	merged := ResolveIntrinsic("gpt-4o", nil)

	if !merged.ToolCalling {
		t.Error("should get tool_calling from heuristic (gpt-4 pattern)")
	}
	if !merged.Vision {
		t.Error("should get vision from heuristic (gpt-4o pattern)")
	}
}

func TestResolveIntrinsic_HeuristicOnly(t *testing.T) {
	// No catalog, no known table — pure heuristic
	merged := ResolveIntrinsic("deepseek-r1-distill-llama-70b", nil)

	if !merged.Reasoning {
		t.Error("should infer reasoning from deepseek-r1 pattern")
	}
	if !merged.Streaming {
		t.Error("should infer streaming (everything streams)")
	}
}

func TestHasProviderData(t *testing.T) {
	empty := models.ModelCapabilities{}
	if empty.HasProviderData() {
		t.Error("empty caps should not have provider data")
	}

	withTool := models.ModelCapabilities{ToolCalling: true}
	if !withTool.HasProviderData() {
		t.Error("caps with tool_calling should have provider data")
	}

	withContext := models.ModelCapabilities{MaxContext: 128000}
	if !withContext.HasProviderData() {
		t.Error("caps with max_context should have provider data")
	}
}