package capability

import (
	"strings"
	"testing"

	"reasonix/internal/config"
	"reasonix/internal/plugin"
	"reasonix/internal/tool"
)

func boolPtr(b bool) *bool { return &b }

func TestLoadCachedToolsForSpecsHonorsSchemaCacheKey(t *testing.T) {
	t.Setenv("REASONIX_CACHE_HOME", t.TempDir())
	fresh := plugin.Spec{Name: "gh", Type: "stdio", Command: "gh-mcp"}
	if err := plugin.SaveCachedSchema("gh", plugin.CachedSchema{
		CacheKey: plugin.SchemaCacheKey(fresh),
		Tools:    []plugin.CachedTool{{Name: "search_issues", Description: "search", ReadOnly: true}},
	}); err != nil {
		t.Fatal(err)
	}
	stale := plugin.Spec{Name: "old", Type: "stdio", Command: "old-mcp"}
	if err := plugin.SaveCachedSchema("old", plugin.CachedSchema{
		CacheKey: "some-other-cache-key",
		Tools:    []plugin.CachedTool{{Name: "do_thing"}},
	}); err != nil {
		t.Fatal(err)
	}

	cached, keyOK := LoadCachedToolsForSpecs([]plugin.Spec{fresh, stale, {Name: "absent"}}, plugin.HostProfileCore)
	if len(cached["gh"]) != 1 || !keyOK["gh"] {
		t.Fatalf("fresh cache: tools=%v keyOK=%v", cached["gh"], keyOK["gh"])
	}
	if len(cached["old"]) != 1 || keyOK["old"] {
		t.Fatalf("stale cache must load with keyOK=false: tools=%v keyOK=%v", cached["old"], keyOK["old"])
	}
	if _, ok := cached["absent"]; ok {
		t.Fatal("server without cache must be absent")
	}
}

func TestBuildCatalogSurfacesCachedToolsForAutoStartFalse(t *testing.T) {
	cached := map[string][]plugin.CachedTool{
		"gh":  {{Name: "search_issues", Description: "search", ReadOnly: true}},
		"old": {{Name: "do_thing"}},
	}
	keyOK := map[string]bool{"gh": true, "old": false}
	cat := BuildCatalog(CatalogOptions{
		Plugins: []config.PluginEntry{
			{Name: "gh", AutoStart: boolPtr(false)},
			{Name: "old", AutoStart: boolPtr(false)},
		},
		CachedTools: cached,
		CacheKeyOK:  keyOK,
	})
	byID := map[string]Entry{}
	for _, e := range cat.Entries {
		byID[e.ID] = e
	}
	toolEntry, ok := byID["mcp-tool:gh/search_issues"]
	if !ok {
		t.Fatalf("cached tool missing from catalog: %v", cat.Entries)
	}
	if !toolEntry.ReadOnly || toolEntry.ToolName == "" {
		t.Fatalf("cached tool entry lost metadata: %+v", toolEntry)
	}
	if server := byID["mcp-server:old"]; server.Status != StatusStale {
		t.Fatalf("cache-key-mismatched schema should mark the server stale, got %q", server.Status)
	}
	if staleTool, ok := byID["mcp-tool:old/do_thing"]; !ok {
		t.Fatal("stale cached tools should still appear as candidates")
	} else if staleTool.Status != StatusStale {
		t.Fatalf("stale server's cached tools must inherit stale, got %q", staleTool.Status)
	}
}

func TestRecordRouterUsageAccumulates(t *testing.T) {
	a := &Audit{}
	a.RecordRouterUsage(100, 20, 0.005, 340)
	a.RecordRouterUsage(50, 10, 0.002, 160)
	snap := a.Snapshot()
	if snap.RouterPromptTokens != 150 || snap.RouterCompletionTokens != 30 {
		t.Fatalf("token counters: prompt=%d completion=%d", snap.RouterPromptTokens, snap.RouterCompletionTokens)
	}
	if snap.RouterCost < 0.0069 || snap.RouterCost > 0.0071 {
		t.Fatalf("cost = %v", snap.RouterCost)
	}
	if snap.RouterLatencyMs != 500 {
		t.Fatalf("latency = %v", snap.RouterLatencyMs)
	}
}

func TestAuditRecordsDecisionFunnelAndDecline(t *testing.T) {
	a := &Audit{}
	a.RecordDecision(RouteDecision{Candidates: []RouteCandidate{
		{Policy: AutoUseRequire},
		{Policy: AutoUsePrefer},
		{Policy: AutoUseSuggest},
	}})
	a.RecordDecline()
	snap := a.Snapshot()
	if snap.RoutedCandidates != 3 || snap.RoutedRequire != 1 || snap.RoutedPrefer != 1 || snap.RoutedSuggest != 1 || snap.Declines != 1 {
		t.Fatalf("decision funnel audit: candidates=%d require=%d prefer=%d suggest=%d declines=%d",
			snap.RoutedCandidates, snap.RoutedRequire, snap.RoutedPrefer, snap.RoutedSuggest, snap.Declines)
	}
}

func TestDeliveryRouteRenderKeepsCapabilityIDAndProxyInstruction(t *testing.T) {
	entry := Entry{
		ID: "mcp-tool:gh/search_issues", Kind: KindMCPTool, Name: "gh/search_issues",
		Status: StatusConfigured, ConnectSource: "mcp", ConnectName: "gh",
	}
	d := RouteDecision{ClosedLoop: true, Candidates: []RouteCandidate{{Entry: entry, Policy: AutoUsePrefer, Reason: "matches task"}}}
	out := RenderTransientBlock(d)
	if !strings.Contains(out, "mcp-tool:gh/search_issues") {
		t.Fatalf("delivery render must keep the concrete capability id:\n%s", out)
	}
	if !strings.Contains(out, `use_capability(action="call", capability_id="mcp-tool:gh/search_issues"`) {
		t.Fatalf("delivery render must instruct the proxy call:\n%s", out)
	}
	if strings.Contains(out, "connect_tool_source") {
		t.Fatalf("connect_tool_source is not registered in Delivery:\n%s", out)
	}
	// Server entries direct the model to connect-and-list via the same proxy.
	server := Entry{ID: "mcp-server:gh", Kind: KindMCPServer, Name: "gh", Status: StatusConfigured, ConnectSource: "mcp", ConnectName: "gh"}
	out = RenderTransientBlock(RouteDecision{ClosedLoop: true, Candidates: []RouteCandidate{{Entry: server, Policy: AutoUseSuggest, Reason: "r"}}})
	if !strings.Contains(out, `use_capability(action="call", capability_id="mcp-server:gh")`) || !strings.Contains(out, "list its tools") {
		t.Fatalf("server candidate must instruct connect-and-list:\n%s", out)
	}
	// Non-delivery keeps the historical connect_tool_source instruction.
	d.ClosedLoop = false
	out = RenderTransientBlock(d)
	if !strings.Contains(out, "connect_tool_source") {
		t.Fatalf("non-delivery render lost connect_tool_source:\n%s", out)
	}
}

func TestCapabilityProxyRouteRenderKeepsConcreteMCPIDs(t *testing.T) {
	for _, entry := range []Entry{
		{ID: "mcp-tool:gh/search_issues", Kind: KindMCPTool, Name: "gh/search_issues", Status: StatusConfigured, ConnectSource: "mcp", ConnectName: "gh"},
		{ID: "mcp-server:gh", Kind: KindMCPServer, Name: "gh", Status: StatusConfigured, ConnectSource: "mcp", ConnectName: "gh"},
	} {
		out := RenderTransientBlock(RouteDecision{
			CapabilityProxy: true,
			Candidates:      []RouteCandidate{{Entry: entry, Policy: AutoUsePrefer, Reason: "matches task"}},
		})
		if !strings.Contains(out, "- "+entry.ID+" ") {
			t.Fatalf("capability proxy route must lead with the concrete id %q:\n%s", entry.ID, out)
		}
		if strings.Contains(out, "source:mcp/gh") {
			t.Fatalf("capability proxy route rewrote %q to an unusable source target:\n%s", entry.ID, out)
		}
		if !strings.Contains(out, `use_capability(action="call", capability_id="`+entry.ID+`"`) {
			t.Fatalf("capability proxy route lost the concrete call instruction for %q:\n%s", entry.ID, out)
		}
	}

	// CapabilityProxy only replaces the MCP connector. Other configured
	// capability kinds still use their ordinary source routing.
	skill := Entry{ID: "skill:review", Kind: KindSkill, Name: "review", Status: StatusConfigured, ConnectSource: "skills"}
	out := RenderTransientBlock(RouteDecision{
		CapabilityProxy: true,
		Candidates:      []RouteCandidate{{Entry: skill, Policy: AutoUseSuggest, Reason: "matches task"}},
	})
	if !strings.Contains(out, "source:skills") || !strings.Contains(out, "connect_tool_source") {
		t.Fatalf("MCP proxy routing changed the ordinary skill connector:\n%s", out)
	}
}

func TestMCPServerEntriesPropagatesFailureToCachedTools(t *testing.T) {
	entries := MCPServerEntries(CatalogOptions{
		Plugins: []config.PluginEntry{{Name: "github", Type: "http", URL: "https://example.test/mcp"}},
		Failed:  map[string]string{"github": "http 401"},
		CachedTools: map[string][]plugin.CachedTool{
			"github": {{Name: "search_issues", Description: "search issues", ReadOnly: true}},
		},
	})

	for _, entry := range entries {
		if entry.ID == "mcp-tool:github/search_issues" {
			if entry.Status != StatusFailed {
				t.Fatalf("cached tool status = %q, want %q", entry.Status, StatusFailed)
			}
			return
		}
	}
	t.Fatal("cached MCP tool entry not found")
}

func TestBuildCatalogUnavailableServerOverridesRegistryCachedTool(t *testing.T) {
	const server = "github"
	tests := []struct {
		name     string
		failed   map[string]string
		disabled map[string]bool
		want     Status
		reason   string
	}{
		{name: "failed", failed: map[string]string{server: "http 401"}, want: StatusFailed, reason: "http 401"},
		{name: "disabled", disabled: map[string]bool{server: true}, want: StatusDisabled},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			cat := BuildCatalog(CatalogOptions{
				Tools: []tool.ContractEntry{{
					Name:        plugin.ModelToolName(server, "search_issues"),
					Description: "search issues",
					ReadOnly:    true,
				}},
				Plugins:  []config.PluginEntry{{Name: server, Type: "http", URL: "https://example.test/mcp"}},
				Failed:   tc.failed,
				Disabled: tc.disabled,
				CachedTools: map[string][]plugin.CachedTool{
					server: {{Name: "search_issues", Description: "search issues", ReadOnly: true}},
				},
			})

			entry, ok := cat.Lookup("mcp-tool:github/search_issues")
			if !ok {
				t.Fatal("registry-backed cached MCP tool missing from catalog")
			}
			if entry.Status != tc.want || entry.FailureReason != tc.reason {
				t.Fatalf("registry-backed cached tool = %+v, want status=%q reason=%q", entry, tc.want, tc.reason)
			}
			if decision := Route("查一下 GitHub issue", cat.Entries); len(decision.Candidates) != 0 {
				t.Fatalf("unavailable registry-backed cached MCP tool was routed: %+v", decision.Candidates)
			}
		})
	}
}

func TestOrdinaryRouteRenderDeduplicatesCollapsedMCPSourceLines(t *testing.T) {
	candidates := []RouteCandidate{
		{
			Entry: Entry{
				ID: "mcp-tool:search/search", Kind: KindMCPTool, Name: "search/search",
				Status: StatusConfigured, ConnectSource: "mcp", ConnectName: "search",
			},
			Policy: AutoUsePrefer, Reason: "the task appears to need fresh external data",
		},
		{
			Entry: Entry{
				ID: "mcp-tool:search/fetch", Kind: KindMCPTool, Name: "search/fetch",
				Status: StatusConfigured, ConnectSource: "mcp", ConnectName: "search",
			},
			Policy: AutoUsePrefer, Reason: "the task appears to need fresh external data",
		},
		{
			Entry: Entry{
				ID: "mcp-tool:docs/read", Kind: KindMCPTool, Name: "docs/read",
				Status: StatusConfigured, ConnectSource: "mcp", ConnectName: "docs",
			},
			Policy: AutoUsePrefer, Reason: "the task appears to need fresh external data",
		},
	}

	out := RenderTransientBlock(RouteDecision{Candidates: candidates})
	if got := strings.Count(out, "- source:mcp/search "); got != 1 {
		t.Fatalf("collapsed MCP source rendered %d times, want 1:\n%s", got, out)
	}
	if got := strings.Count(out, "- source:mcp/docs "); got != 1 {
		t.Fatalf("independent MCP source rendered %d times, want 1:\n%s", got, out)
	}

	for _, decision := range []RouteDecision{
		{ClosedLoop: true, Candidates: candidates},
		{CapabilityProxy: true, Candidates: candidates},
	} {
		proxyOut := RenderTransientBlock(decision)
		for _, candidate := range candidates {
			if !strings.Contains(proxyOut, "- "+candidate.Entry.ID+" ") {
				t.Fatalf("proxy route lost concrete capability %q:\n%s", candidate.Entry.ID, proxyOut)
			}
		}
	}
}

func TestCatalogKeepsProxyToolsAfterConnect(t *testing.T) {
	proxy := map[string][]plugin.CachedTool{
		"gh": {{Name: "search_issues", Description: "search", ReadOnly: true}},
	}
	cat := BuildCatalog(CatalogOptions{
		Plugins:    []config.PluginEntry{{Name: "gh", AutoStart: boolPtr(false)}},
		Connected:  map[string]bool{"gh": true}, // server is ready now
		ProxyTools: proxy,
	})
	byID := map[string]Entry{}
	for _, e := range cat.Entries {
		byID[e.ID] = e
	}
	toolEntry, ok := byID["mcp-tool:gh/search_issues"]
	if !ok {
		t.Fatalf("proxy-connected tool vanished from catalog: %+v", cat.Entries)
	}
	if toolEntry.Status != StatusReady {
		t.Fatalf("proxy-connected tool should be ready, got %q", toolEntry.Status)
	}
	// When the same server's tools are already on the registry, no duplicates.
	cat = BuildCatalog(CatalogOptions{
		Tools:      []tool.ContractEntry{{Name: plugin.ModelToolName("gh", "search_issues")}},
		Plugins:    []config.PluginEntry{{Name: "gh", AutoStart: boolPtr(false)}},
		Connected:  map[string]bool{"gh": true},
		ProxyTools: proxy,
	})
	count := 0
	for _, e := range cat.Entries {
		if e.ID == "mcp-tool:gh/search_issues" {
			count++
		}
	}
	// The registry's own ToolEntries contribution is the single source here;
	// the proxy snapshot must not add a duplicate.
	if count != 1 {
		t.Fatalf("registry-backed server should have exactly one catalog entry, got %d", count)
	}
}

func TestCatalogDoesNotRouteProxyToolsAfterFailure(t *testing.T) {
	cat := BuildCatalog(CatalogOptions{
		Plugins:     []config.PluginEntry{{Name: "gh", AutoStart: boolPtr(false)}},
		Failed:      map[string]string{"gh": "connection reset"},
		Connected:   map[string]bool{"gh": true},
		CachedTools: map[string][]plugin.CachedTool{"gh": {{Name: "search_issues"}}},
		ProxyTools:  map[string][]plugin.CachedTool{"gh": {{Name: "search_issues"}}},
	})
	entry, ok := cat.Lookup("mcp-tool:gh/search_issues")
	if !ok || entry.Status != StatusFailed {
		t.Fatalf("failed server proxy tool = (%+v, %v), want failed catalog entry", entry, ok)
	}
}