package openapi

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

func TestCreateChatCompletion(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/chat/completions" {
			t.Errorf("expected path /chat/completions, got %s", r.URL.Path)
		}
		if r.Header.Get("Authorization") != "Bearer test-key" {
			t.Errorf("expected bearer token, got %s", r.Header.Get("Authorization"))
		}

		var req ChatCompletionRequest
		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			t.Fatal(err)
		}

		if !req.CachePrompt {
			t.Error("expected cache_prompt to be true")
		}

		resp := ChatCompletionResponse{
			ID:    "test-id",
			Model: "test-model",
			Choices: []Choice{
				{
					Message: Message{
						Role:    RoleAssistant,
						Content: "Hello!",
					},
				},
			},
		}
		json.NewEncoder(w).Encode(resp)
	}))
	defer server.Close()

	client := NewClient(server.URL, "test-key")
	resp, err := client.CreateChatCompletion(context.Background(), ChatCompletionRequest{
		Model: "test-model",
		Messages: []Message{
			{Role: RoleUser, Content: "Hi"},
		},
		CachePrompt: true,
	})

	if err != nil {
		t.Fatal(err)
	}

	if resp.Choices[0].Message.Content != "Hello!" {
		t.Errorf("expected Hello!, got %s", resp.Choices[0].Message.Content)
	}
}

func TestCreateChatCompletionWithReasoning(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		resp := ChatCompletionResponse{
			Choices: []Choice{
				{
					Message: Message{
						Role:             RoleAssistant,
						Content:          "Hello!",
						ReasoningContent: "Thinking...",
					},
				},
			},
		}
		json.NewEncoder(w).Encode(resp)
	}))
	defer server.Close()

	client := NewClient(server.URL, "test-key")
	resp, err := client.CreateChatCompletion(context.Background(), ChatCompletionRequest{
		Model: "test-model",
		Messages: []Message{
			{Role: RoleUser, Content: "Hi"},
		},
	})

	if err != nil {
		t.Fatal(err)
	}

	if resp.Choices[0].Message.ReasoningContent != "Thinking..." {
		t.Errorf("expected Thinking..., got %s", resp.Choices[0].Message.ReasoningContent)
	}
}

func TestCreateChatCompletionWithToolCalls(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		resp := ChatCompletionResponse{
			Choices: []Choice{
				{
					Message: Message{
						Role: RoleAssistant,
						ToolCalls: []ToolCall{
							{
								ID:   "call_123",
								Type: "function",
								Function: ToolCallFunction{
									Name:      "get_weather",
									Arguments: `{"location":"Stockholm"}`,
								},
							},
						},
					},
				},
			},
		}
		json.NewEncoder(w).Encode(resp)
	}))
	defer server.Close()

	client := NewClient(server.URL, "test-key")
	resp, err := client.CreateChatCompletion(context.Background(), ChatCompletionRequest{
		Model: "test-model",
		Messages: []Message{
			{Role: RoleUser, Content: "What is the weather in Stockholm?"},
		},
		Tools: []Tool{
			{
				Type: "function",
				Function: FunctionDefinition{
					Name:        "get_weather",
					Description: "Get the current weather",
					Parameters:  json.RawMessage(`{"type":"object","properties":{"location":{"type":"string"}}}`),
				},
			},
		},
	})

	if err != nil {
		t.Fatal(err)
	}

	if len(resp.Choices[0].Message.ToolCalls) != 1 {
		t.Fatalf("expected 1 tool call, got %d", len(resp.Choices[0].Message.ToolCalls))
	}

	tc := resp.Choices[0].Message.ToolCalls[0]
	if tc.Function.Name != "get_weather" {
		t.Errorf("expected get_weather, got %s", tc.Function.Name)
	}
}

func TestCreateChatCompletionWithToolResponse(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var req ChatCompletionRequest
		json.NewDecoder(r.Body).Decode(&req)

		// Check if the tool response is present
		foundToolResponse := false
		for _, msg := range req.Messages {
			if msg.Role == RoleTool && msg.ToolCallID == "call_123" {
				foundToolResponse = true
				break
			}
		}

		if !foundToolResponse {
			t.Error("expected tool response message in request")
		}

		resp := ChatCompletionResponse{
			Choices: []Choice{
				{
					Message: Message{
						Role:    RoleAssistant,
						Content: "The weather in Stockholm is 15°C.",
					},
				},
			},
		}
		json.NewEncoder(w).Encode(resp)
	}))
	defer server.Close()

	client := NewClient(server.URL, "test-key")
	_, err := client.CreateChatCompletion(context.Background(), ChatCompletionRequest{
		Model: "test-model",
		Messages: []Message{
			{Role: RoleUser, Content: "What is the weather in Stockholm?"},
			{
				Role: RoleAssistant,
				ToolCalls: []ToolCall{
					{
						ID:   "call_123",
						Type: "function",
						Function: ToolCallFunction{
							Name:      "get_weather",
							Arguments: `{"location":"Stockholm"}`,
						},
					},
				},
			},
			{
				Role:       RoleTool,
				ToolCallID: "call_123",
				Content:    `{"temp":15}`,
			},
		},
	})

	if err != nil {
		t.Fatal(err)
	}
}

func TestCreateChatCompletionStreamWithReasoning(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/event-stream")
		fmt.Fprintf(w, "data: %s\n\n", `{"choices":[{"delta":{"reasoning_content":"Thinking"}}]} `)
		fmt.Fprintf(w, "data: %s\n\n", `{"choices":[{"delta":{"content":"Hello"}}]} `)
		fmt.Fprintf(w, "data: [DONE]\n\n")
	}))
	defer server.Close()

	client := NewClient(server.URL, "test-key")
	chunks, errs := client.CreateChatCompletionStream(context.Background(), ChatCompletionRequest{
		Model: "test-model",
		Messages: []Message{
			{Role: RoleUser, Content: "Hi"},
		},
	})

	var reasoning, content string
	for chunk := range chunks {
		if len(chunk.Choices) > 0 {
			reasoning += chunk.Choices[0].Delta.ReasoningContent
			content += chunk.Choices[0].Delta.Content
		}
	}

	if err := <-errs; err != nil {
		t.Fatal(err)
	}

	if reasoning != "Thinking" {
		t.Errorf("expected Thinking, got %s", reasoning)
	}
	if content != "Hello" {
		t.Errorf("expected Hello, got %s", content)
	}
}