package auth

import (
	"testing"

	internalconfig "github.com/router-for-me/CLIProxyAPI/v6/internal/config"
)

func TestResolveOAuthUpstreamModel_SuffixPreservation(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name     string
		mappings map[string][]internalconfig.ModelNameMapping
		channel  string
		input    string
		want     string
	}{
		{
			name: "numeric suffix preserved",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "gemini-2.5-pro"}},
			},
			channel: "gemini-cli",
			input:   "gemini-2.5-pro(8192)",
			want:    "gemini-2.5-pro-exp-03-25(8192)",
		},
		{
			name: "level suffix preserved",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"claude": {{Name: "claude-sonnet-4-5-20250514", Alias: "claude-sonnet-4-5"}},
			},
			channel: "claude",
			input:   "claude-sonnet-4-5(high)",
			want:    "claude-sonnet-4-5-20250514(high)",
		},
		{
			name: "no suffix unchanged",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "gemini-2.5-pro"}},
			},
			channel: "gemini-cli",
			input:   "gemini-2.5-pro",
			want:    "gemini-2.5-pro-exp-03-25",
		},
		{
			name: "config suffix takes priority",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"claude": {{Name: "claude-sonnet-4-5-20250514(low)", Alias: "claude-sonnet-4-5"}},
			},
			channel: "claude",
			input:   "claude-sonnet-4-5(high)",
			want:    "claude-sonnet-4-5-20250514(low)",
		},
		{
			name: "auto suffix preserved",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "gemini-2.5-pro"}},
			},
			channel: "gemini-cli",
			input:   "gemini-2.5-pro(auto)",
			want:    "gemini-2.5-pro-exp-03-25(auto)",
		},
		{
			name: "none suffix preserved",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "gemini-2.5-pro"}},
			},
			channel: "gemini-cli",
			input:   "gemini-2.5-pro(none)",
			want:    "gemini-2.5-pro-exp-03-25(none)",
		},
		{
			name: "case insensitive alias lookup with suffix",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "Gemini-2.5-Pro"}},
			},
			channel: "gemini-cli",
			input:   "gemini-2.5-pro(high)",
			want:    "gemini-2.5-pro-exp-03-25(high)",
		},
		{
			name: "no mapping returns empty",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "gemini-2.5-pro"}},
			},
			channel: "gemini-cli",
			input:   "unknown-model(high)",
			want:    "",
		},
		{
			name: "wrong channel returns empty",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "gemini-2.5-pro"}},
			},
			channel: "claude",
			input:   "gemini-2.5-pro(high)",
			want:    "",
		},
		{
			name: "empty suffix filtered out",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "gemini-2.5-pro"}},
			},
			channel: "gemini-cli",
			input:   "gemini-2.5-pro()",
			want:    "gemini-2.5-pro-exp-03-25",
		},
		{
			name: "incomplete suffix treated as no suffix",
			mappings: map[string][]internalconfig.ModelNameMapping{
				"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "gemini-2.5-pro(high"}},
			},
			channel: "gemini-cli",
			input:   "gemini-2.5-pro(high",
			want:    "gemini-2.5-pro-exp-03-25",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			mgr := NewManager(nil, nil, nil)
			mgr.SetConfig(&internalconfig.Config{})
			mgr.SetOAuthModelMappings(tt.mappings)

			auth := createAuthForChannel(tt.channel)
			got := mgr.resolveOAuthUpstreamModel(auth, tt.input)
			if got != tt.want {
				t.Errorf("resolveOAuthUpstreamModel(%q) = %q, want %q", tt.input, got, tt.want)
			}
		})
	}
}

func createAuthForChannel(channel string) *Auth {
	switch channel {
	case "gemini-cli":
		return &Auth{Provider: "gemini-cli"}
	case "claude":
		return &Auth{Provider: "claude", Attributes: map[string]string{"auth_kind": "oauth"}}
	case "vertex":
		return &Auth{Provider: "vertex", Attributes: map[string]string{"auth_kind": "oauth"}}
	case "codex":
		return &Auth{Provider: "codex", Attributes: map[string]string{"auth_kind": "oauth"}}
	case "aistudio":
		return &Auth{Provider: "aistudio"}
	case "antigravity":
		return &Auth{Provider: "antigravity"}
	case "qwen":
		return &Auth{Provider: "qwen"}
	case "iflow":
		return &Auth{Provider: "iflow"}
	default:
		return &Auth{Provider: channel}
	}
}

func TestApplyOAuthModelMapping_SuffixPreservation(t *testing.T) {
	t.Parallel()

	mappings := map[string][]internalconfig.ModelNameMapping{
		"gemini-cli": {{Name: "gemini-2.5-pro-exp-03-25", Alias: "gemini-2.5-pro"}},
	}

	mgr := NewManager(nil, nil, nil)
	mgr.SetConfig(&internalconfig.Config{})
	mgr.SetOAuthModelMappings(mappings)

	auth := &Auth{ID: "test-auth-id", Provider: "gemini-cli"}
	metadata := map[string]any{"existing": "value"}

	resolvedModel, resultMeta := mgr.applyOAuthModelMapping(auth, "gemini-2.5-pro(8192)", metadata)
	if resolvedModel != "gemini-2.5-pro-exp-03-25(8192)" {
		t.Errorf("applyOAuthModelMapping() model = %q, want %q", resolvedModel, "gemini-2.5-pro-exp-03-25(8192)")
	}

	originalModel, ok := resultMeta["model_mapping_original_model"].(string)
	if !ok || originalModel != "gemini-2.5-pro(8192)" {
		t.Errorf("applyOAuthModelMapping() metadata[model_mapping_original_model] = %v, want %q", resultMeta["model_mapping_original_model"], "gemini-2.5-pro(8192)")
	}

	if resultMeta["existing"] != "value" {
		t.Errorf("applyOAuthModelMapping() metadata[existing] = %v, want %q", resultMeta["existing"], "value")
	}
}