package runtimeconfig

import (
	"encoding/json"
	"strings"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
)

// 本文件钉住 provider 级推理开关形状的配置面（裁决 03.4.2 / 08.4.1）：每个
// provider 组各声明自己的形状，只有本版本实现且有依据的形状才被接受，未声明的
// 组在 models.json 里不留下空对象（保守默认 = 不发任何推理字段）。

// TestValidateReasoningKind 覆盖合法/非法形状：未知形状必须让保存失败（否则
// 「配了却不生效」正是裁决要消灭的假适配），anthropic 组不允许声明 OpenAI 侧形状。
func TestValidateReasoningKind(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name     string
		provider string
		kind     string
		wantErr  string
	}{
		{name: "unset", provider: ProviderOpenAI},
		{name: "auto", provider: ProviderOpenAI, kind: ReasoningKindAuto},
		{name: "deepseek", provider: ProviderOpenAI, kind: ReasoningKindDeepSeek},
		{name: "openai", provider: ProviderOpenAI, kind: ReasoningKindOpenAI},
		{name: "vllm", provider: ProviderOpenAI, kind: ReasoningKindVLLM},
		{name: "dashscope", provider: ProviderOpenAI, kind: ReasoningKindDashScope},
		{name: "padded", provider: ProviderOpenAI, kind: "  vllm  "},
		{name: "auto_on_anthropic", provider: ProviderAnthropic, kind: ReasoningKindAuto},
		{name: "unknown", provider: ProviderOpenAI, kind: "gemini", wantErr: "must be one of"},
		{name: "openai_shape_on_anthropic", provider: ProviderAnthropic, kind: ReasoningKindVLLM,
			wantErr: "openai-compatible"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			g := Group{
				ID: "g", Provider: tc.provider, BaseURL: "https://x/v1", Model: "m",
				Reasoning: ReasoningOptions{Kind: tc.kind},
			}
			err := g.Validate()
			if tc.wantErr == "" {
				if err != nil {
					t.Fatalf("Validate() = %v, want nil for kind %q", err, tc.kind)
				}
				return
			}
			if err == nil || !strings.Contains(err.Error(), tc.wantErr) {
				t.Fatalf("Validate() = %v, want an error containing %q", err, tc.wantErr)
			}
		})
	}
}

// TestReasoningKindJSONShape asserts an undeclared shape is absent from models.json
// (no empty object churn on every group) and a declared one round-trips by name.
func TestReasoningKindJSONShape(t *testing.T) {
	t.Parallel()
	plain := Group{ID: "g", Provider: ProviderOpenAI, BaseURL: "https://x/v1", Model: "m"}
	raw, err := json.Marshal(plain)
	if err != nil {
		t.Fatalf("Marshal: %v", err)
	}
	if strings.Contains(string(raw), "reasoning") {
		t.Fatalf("marshal = %s, want no reasoning key for an undeclared shape", raw)
	}
	plain.Reasoning.Kind = ReasoningKindDashScope
	raw, err = json.Marshal(plain)
	if err != nil {
		t.Fatalf("Marshal: %v", err)
	}
	if !strings.Contains(string(raw), `"reasoning":{"kind":"dashscope"}`) {
		t.Fatalf("marshal = %s, want the declared shape serialized", raw)
	}

	path := t.TempDir() + "/models.json"
	if err := SaveModels(path, []Group{plain}); err != nil {
		t.Fatalf("SaveModels: %v", err)
	}
	groups, err := LoadModels(path, config.LLMConfig{})
	if err != nil {
		t.Fatalf("LoadModels: %v", err)
	}
	if got := groups[0].Reasoning.Kind; got != ReasoningKindDashScope {
		t.Fatalf("round-tripped kind = %q, want %q", got, ReasoningKindDashScope)
	}
}

// TestToLLMConfigCarriesReasoningKind 断言形状随组配置抵达适配器那一层（否则
// models.json 的声明会静默失效）。
func TestToLLMConfigCarriesReasoningKind(t *testing.T) {
	t.Parallel()
	for _, provider := range []string{ProviderOpenAI, ProviderAnthropic} {
		g := Group{
			ID: "g", Provider: provider, BaseURL: "https://x", APIKey: "k", Model: "m",
			Reasoning: ReasoningOptions{Kind: "  " + ReasoningKindDeepSeek + "  "},
		}
		if got := g.ToLLMConfig().ReasoningKind; got != ReasoningKindDeepSeek {
			t.Errorf("provider %s: ReasoningKind = %q, want the trimmed declared shape", provider, got)
		}
	}
}

// TestGroupFromEnvCarriesReasoningKind pins the env fallback twin: an env-only
// deployment can declare its endpoint's shape, and its default stays blank so no
// reasoning field is ever sent without an explicit declaration.
func TestGroupFromEnvCarriesReasoningKind(t *testing.T) {
	t.Parallel()
	if got := GroupFromEnv(config.LLMConfig{})[0].Reasoning.Kind; got != "" {
		t.Fatalf("env default kind = %q, want empty (conservative)", got)
	}
	env := config.LLMConfig{BaseURL: "https://x/v1", APIKey: "k", Model: "m", ReasoningKind: " vllm "}
	groups := GroupFromEnv(env)
	if len(groups) != 1 {
		t.Fatalf("groups = %d, want 1", len(groups))
	}
	if got := groups[0].Reasoning.Kind; got != ReasoningKindVLLM {
		t.Fatalf("env kind = %q, want %q", got, ReasoningKindVLLM)
	}
	if err := groups[0].Validate(); err != nil {
		t.Fatalf("a fully configured env group must validate: %v", err)
	}
}