package aiprovider

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"
)

func TestAgentRouterUsesChatCompletionsContract(t *testing.T) {
	var received map[string]any
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/v1/chat/completions" {
			t.Fatalf("path = %q", r.URL.Path)
		}
		if r.Header.Get("Authorization") != "Bearer test-key" {
			t.Fatal("authorization header missing")
		}
		if r.Header.Get("User-Agent") != agentRouterUserAgent {
			t.Fatalf("user-agent = %q", r.Header.Get("User-Agent"))
		}
		if err := json.NewDecoder(r.Body).Decode(&received); err != nil {
			t.Fatal(err)
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"id":"chat-1","choices":[{"finish_reason":"stop","message":{"role":"assistant","content":"{\"answer\":\"ok\"}"}}],"usage":{"prompt_tokens":12,"completion_tokens":4}}`))
	}))
	defer server.Close()

	client := NewAgentRouter(Config{BaseURL: server.URL, APIKey: "test-key", Model: "gpt-test", Timeout: time.Second}, server.Client())
	var generator Generator = client
	result, usage, err := generator.Generate(context.Background(), Request{
		SchemaName: "answer", Schema: map[string]any{"type": "object", "additionalProperties": false},
		Instructions: "system rules", Input: json.RawMessage(`{"safe":"aggregate"}`), MaxOutputTokens: 200,
	})
	if err != nil {
		t.Fatal(err)
	}
	if string(result) != `{"answer":"ok"}` || usage.ProviderRequestID != "chat-1" || usage.InputTokens != 12 || usage.OutputTokens != 4 {
		t.Fatalf("result=%s usage=%+v", result, usage)
	}
	if received["model"] != "gpt-test" || received["reasoning_effort"] != "medium" || received["parallel_tool_calls"] != false || received["max_tokens"] != float64(200) {
		t.Fatalf("request controls = %#v", received)
	}
	format := received["response_format"].(map[string]any)
	if format["type"] != "json_schema" {
		t.Fatalf("response_format = %#v", format)
	}
}