package service

import "testing"

func TestResolveOpenAIForwardModel(t *testing.T) {
	tests := []struct {
		name                        string
		account                     *Account
		requestedModel              string
		messagesDispatchMappedModel string
		expectedModel               string
	}{
		{
			name: "uses messages dispatch model for known claude family",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel:              "claude-opus-4-6",
			messagesDispatchMappedModel: "gpt-4o-mini",
			expectedModel:               "gpt-4o-mini",
		},
		{
			name: "uses exact messages dispatch model for unknown claude family",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel:              "claude-fable-5",
			messagesDispatchMappedModel: " gpt-5.6-sol ",
			expectedModel:               "gpt-5.6-sol",
		},
		{
			name:                        "nil account uses messages dispatch model",
			requestedModel:              "claude-fable-5",
			messagesDispatchMappedModel: "gpt-5.6-sol",
			expectedModel:               "gpt-5.6-sol",
		},
		{
			name:           "nil account without messages dispatch keeps requested model",
			requestedModel: "claude-fable-5",
			expectedModel:  "claude-fable-5",
		},
		{
			name: "ordinary unknown gpt model has no messages dispatch fallback",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel: "gpt6",
			expectedModel:  "gpt6",
		},
		{
			name: "account exact mapping overrides messages dispatch model",
			account: &Account{
				Credentials: map[string]any{
					"model_mapping": map[string]any{
						"claude-fable-5": "gpt-5.5",
					},
				},
			},
			requestedModel:              "claude-fable-5",
			messagesDispatchMappedModel: "gpt-5.6-sol",
			expectedModel:               "gpt-5.5",
		},
		{
			name: "account wildcard mapping overrides messages dispatch model",
			account: &Account{
				Credentials: map[string]any{
					"model_mapping": map[string]any{
						"claude-*": "gpt-5.4",
					},
				},
			},
			requestedModel:              "claude-fable-5",
			messagesDispatchMappedModel: "gpt-5.6-sol",
			expectedModel:               "gpt-5.4",
		},
		{
			name: "account passthrough mapping overrides messages dispatch model",
			account: &Account{
				Credentials: map[string]any{
					"model_mapping": map[string]any{
						"claude-fable-5": "claude-fable-5",
					},
				},
			},
			requestedModel:              "claude-fable-5",
			messagesDispatchMappedModel: "gpt-5.6-sol",
			expectedModel:               "claude-fable-5",
		},
		{
			name: "ordinary codex spark request keeps requested model",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel: "gpt-5.3-codex-spark",
			expectedModel:  "gpt-5.3-codex-spark",
		},
		{
			name: "ordinary gpt-5.5 request keeps requested model",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel: "gpt-5.5",
			expectedModel:  "gpt-5.5",
		},
		{
			name: "ordinary gpt-5.5-pro request keeps requested model",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel: "gpt-5.5-pro",
			expectedModel:  "gpt-5.5-pro",
		},
		{
			name: "ordinary compact-spelled gpt5.5 request keeps requested model",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel: "gpt5.5",
			expectedModel:  "gpt5.5",
		},
		{
			name: "ordinary namespaced gpt-5.5 request keeps requested model",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel: "openai/gpt-5.5",
			expectedModel:  "openai/gpt-5.5",
		},
		{
			name: "ordinary compact gpt-5.5 request keeps requested model",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel: "gpt-5.5-openai-compact",
			expectedModel:  "gpt-5.5-openai-compact",
		},
		{
			name: "whitespace-only messages dispatch model is ignored",
			account: &Account{
				Credentials: map[string]any{},
			},
			requestedModel:              "gpt-5.5",
			messagesDispatchMappedModel: "  ",
			expectedModel:               "gpt-5.5",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := resolveOpenAIForwardModel(tt.account, tt.requestedModel, tt.messagesDispatchMappedModel); got != tt.expectedModel {
				t.Fatalf("resolveOpenAIForwardModel(...) = %q, want %q", got, tt.expectedModel)
			}
		})
	}
}

func TestResolveOpenAICompactForwardModel(t *testing.T) {
	tests := []struct {
		name          string
		account       *Account
		model         string
		expectedModel string
	}{
		{
			name:          "nil account keeps original model",
			account:       nil,
			model:         "gpt-5.4",
			expectedModel: "gpt-5.4",
		},
		{
			name: "missing compact mapping keeps original model",
			account: &Account{
				Credentials: map[string]any{},
			},
			model:         "gpt-5.4",
			expectedModel: "gpt-5.4",
		},
		{
			name: "exact compact mapping overrides model",
			account: &Account{
				Credentials: map[string]any{
					"compact_model_mapping": map[string]any{
						"gpt-5.4": "gpt-5.4-openai-compact",
					},
				},
			},
			model:         "gpt-5.4",
			expectedModel: "gpt-5.4-openai-compact",
		},
		{
			name: "wildcard compact mapping overrides model",
			account: &Account{
				Credentials: map[string]any{
					"compact_model_mapping": map[string]any{
						"gpt-5.*": "gpt-5-openai-compact",
					},
				},
			},
			model:         "gpt-5.4",
			expectedModel: "gpt-5-openai-compact",
		},
		{
			name: "passthrough compact mapping remains unchanged",
			account: &Account{
				Credentials: map[string]any{
					"compact_model_mapping": map[string]any{
						"gpt-5.4": "gpt-5.4",
					},
				},
			},
			model:         "gpt-5.4",
			expectedModel: "gpt-5.4",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := resolveOpenAICompactForwardModel(tt.account, tt.model); got != tt.expectedModel {
				t.Fatalf("resolveOpenAICompactForwardModel(...) = %q, want %q", got, tt.expectedModel)
			}
		})
	}
}

func TestNormalizeCodexModel(t *testing.T) {
	cases := map[string]string{
		"gpt-5.3-codex-spark":       "gpt-5.3-codex-spark",
		"gpt-5.3-codex-spark-high":  "gpt-5.3-codex-spark",
		"gpt-5.3-codex-spark-xhigh": "gpt-5.3-codex-spark",
		"gpt-5.3":                   "gpt-5.3-codex",
		"gpt-image-2":               "gpt-image-2",
		"gpt-5.4-nano":              "gpt-5.4-nano",
		"gpt-5.4-nano-high":         "gpt-5.4-nano",
		"gpt6":                      "gpt6",
		"claude-opus-4-6":           "claude-opus-4-6",
	}

	for input, expected := range cases {
		if got := normalizeCodexModel(input); got != expected {
			t.Fatalf("normalizeCodexModel(%q) = %q, want %q", input, got, expected)
		}
	}
}

func TestNormalizeOpenAIModelForUpstream(t *testing.T) {
	tests := []struct {
		name    string
		account *Account
		model   string
		want    string
	}{
		{
			name:    "oauth routes bare GPT-5.6 alias to Sol",
			account: &Account{Type: AccountTypeOAuth},
			model:   "gpt-5.6",
			want:    "gpt-5.6-sol",
		},
		{
			name:    "oauth routes provider-prefixed GPT-5.6 alias to Sol",
			account: &Account{Type: AccountTypeOAuth},
			model:   "openai/gpt-5.6",
			want:    "gpt-5.6-sol",
		},
		{
			name:    "oauth preserves unknown non codex model",
			account: &Account{Type: AccountTypeOAuth},
			model:   "gemini-3-flash-preview",
			want:    "gemini-3-flash-preview",
		},
		{
			name:    "oauth preserves invalid gpt model",
			account: &Account{Type: AccountTypeOAuth},
			model:   "gpt6",
			want:    "gpt6",
		},
		{
			name:    "oauth normalizes known codex alias",
			account: &Account{Type: AccountTypeOAuth},
			model:   "gpt-5.4-high",
			want:    "gpt-5.4",
		},
		{
			name:    "oauth preserves GPT-5.5 Pro model",
			account: &Account{Type: AccountTypeOAuth},
			model:   "openai/gpt-5.5-pro",
			want:    "gpt-5.5-pro",
		},
		{
			name:    "oauth preserves codex auto review model",
			account: &Account{Type: AccountTypeOAuth},
			model:   "codex-auto-review",
			want:    "codex-auto-review",
		},
		{
			name:    "apikey preserves official bare GPT-5.6 alias",
			account: &Account{Type: AccountTypeAPIKey},
			model:   "gpt-5.6",
			want:    "gpt-5.6",
		},
		{
			name:    "apikey preserves custom compatible model",
			account: &Account{Type: AccountTypeAPIKey},
			model:   "gemini-3-flash-preview",
			want:    "gemini-3-flash-preview",
		},
		{
			name:    "apikey preserves official non codex model",
			account: &Account{Type: AccountTypeAPIKey},
			model:   "gpt-4.1",
			want:    "gpt-4.1",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := normalizeOpenAIModelForUpstream(tt.account, tt.model); got != tt.want {
				t.Fatalf("normalizeOpenAIModelForUpstream(...) = %q, want %q", got, tt.want)
			}
		})
	}
}

func TestUsageBillingModelCandidatesPreserveCodexAutoReviewModel(t *testing.T) {
	candidates := usageBillingModelCandidates("codex-auto-review")

	expected := []string{"codex-auto-review"}
	if len(candidates) != len(expected) {
		t.Fatalf("usageBillingModelCandidates(codex-auto-review) = %#v, want %#v", candidates, expected)
	}
	for i := range expected {
		if candidates[i] != expected[i] {
			t.Fatalf("usageBillingModelCandidates(codex-auto-review) = %#v, want %#v", candidates, expected)
		}
	}
}

func TestUsageBillingModelCandidatesPreserveGPT55ProModel(t *testing.T) {
	candidates := usageBillingModelCandidates("openai/gpt-5.5-pro")

	expected := []string{"openai/gpt-5.5-pro", "gpt-5.5-pro"}
	if len(candidates) != len(expected) {
		t.Fatalf("usageBillingModelCandidates(openai/gpt-5.5-pro) = %#v, want %#v", candidates, expected)
	}
	for i := range expected {
		if candidates[i] != expected[i] {
			t.Fatalf("usageBillingModelCandidates(openai/gpt-5.5-pro) = %#v, want %#v", candidates, expected)
		}
	}
}