package api

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

func TestNewBaseClient(t *testing.T) {
	client := NewBaseClient("https://api.example.com")
	if client.BaseURL != "https://api.example.com" {
		t.Errorf("Expected BaseURL 'https://api.example.com', got '%s'", client.BaseURL)
	}
	if client.HTTPClient == nil {
		t.Error("HTTPClient should not be nil")
	}
}

func TestBaseClient_Get(t *testing.T) {
	expected := map[string]string{"message": "hello"}
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != "GET" {
			t.Errorf("Expected GET, got %s", r.Method)
		}
		if r.URL.Path != "/test" {
			t.Errorf("Expected path /test, got %s", r.URL.Path)
		}
		if r.Header.Get("Authorization") != "Bearer token123" {
			t.Errorf("Expected Authorization header")
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(expected)
	}))
	defer server.Close()

	client := BaseClient{HTTPClient: server.Client(), BaseURL: server.URL}
	var result map[string]string
	err := client.Get(context.Background(), "/test", map[string]string{"Authorization": "Bearer token123"}, &result)
	if err != nil {
		t.Fatalf("Get failed: %v", err)
	}
	if result["message"] != "hello" {
		t.Errorf("Expected message 'hello', got '%s'", result["message"])
	}
}

func TestBaseClient_Get_Error(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte("server error"))
	}))
	defer server.Close()

	client := BaseClient{HTTPClient: server.Client(), BaseURL: server.URL}
	var result map[string]string
	err := client.Get(context.Background(), "/test", nil, &result)
	if err == nil {
		t.Error("Expected error for 500 response")
	}
}

func TestBaseClient_Post(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != "POST" {
			t.Errorf("Expected POST, got %s", r.Method)
		}
		if r.Header.Get("Content-Type") != "application/json" {
			t.Error("Expected Content-Type application/json")
		}

		var body map[string]string
		json.NewDecoder(r.Body).Decode(&body)
		if body["name"] != "test" {
			t.Errorf("Expected name 'test', got '%s'", body["name"])
		}

		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]int{"id": 42})
	}))
	defer server.Close()

	client := BaseClient{HTTPClient: server.Client(), BaseURL: server.URL}
	var result map[string]int
	err := client.Post(context.Background(), "/create", nil, map[string]string{"name": "test"}, &result)
	if err != nil {
		t.Fatalf("Post failed: %v", err)
	}
	if result["id"] != 42 {
		t.Errorf("Expected id 42, got %d", result["id"])
	}
}

func TestBaseClient_Post_NilBody(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Header.Get("Content-Type") == "application/json" {
			t.Error("Content-Type should not be set for nil body")
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]string{"status": "ok"})
	}))
	defer server.Close()

	client := BaseClient{HTTPClient: server.Client(), BaseURL: server.URL}
	var result map[string]string
	err := client.Post(context.Background(), "/action", nil, nil, &result)
	if err != nil {
		t.Fatalf("Post with nil body failed: %v", err)
	}
}

func TestBaseClient_PostForm(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != "POST" {
			t.Errorf("Expected POST, got %s", r.Method)
		}
		if r.Header.Get("Content-Type") != "application/x-www-form-urlencoded" {
			t.Error("Expected form-urlencoded Content-Type")
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]bool{"success": true})
	}))
	defer server.Close()

	client := BaseClient{HTTPClient: server.Client(), BaseURL: server.URL}
	var result map[string]bool
	err := client.PostForm(context.Background(), "/submit", nil, "key=value", &result)
	if err != nil {
		t.Fatalf("PostForm failed: %v", err)
	}
	if !result["success"] {
		t.Error("Expected success to be true")
	}
}

func TestBaseClient_PostEmpty(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != "POST" {
			t.Errorf("Expected POST, got %s", r.Method)
		}
		if r.Header.Get("X-Custom") != "custom-value" {
			t.Error("Expected custom header")
		}
		w.WriteHeader(http.StatusNoContent)
	}))
	defer server.Close()

	client := BaseClient{HTTPClient: server.Client(), BaseURL: server.URL}
	err := client.PostEmpty(context.Background(), "/trigger", map[string]string{"X-Custom": "custom-value"})
	if err != nil {
		t.Fatalf("PostEmpty failed: %v", err)
	}
}

func TestBaseClient_PostEmpty_Error(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusBadRequest)
		w.Write([]byte("bad request"))
	}))
	defer server.Close()

	client := BaseClient{HTTPClient: server.Client(), BaseURL: server.URL}
	err := client.PostEmpty(context.Background(), "/fail", nil)
	if err == nil {
		t.Error("Expected error for 400 response")
	}
}

func TestBaseClient_Put(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != "PUT" {
			t.Errorf("Expected PUT, got %s", r.Method)
		}
		if r.Header.Get("Content-Type") != "application/x-www-form-urlencoded" {
			t.Error("Expected form-urlencoded Content-Type")
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(map[string]string{"updated": "yes"})
	}))
	defer server.Close()

	client := BaseClient{HTTPClient: server.Client(), BaseURL: server.URL}
	var result map[string]string
	err := client.Put(context.Background(), "/update", nil, "field=value", &result)
	if err != nil {
		t.Fatalf("Put failed: %v", err)
	}
	if result["updated"] != "yes" {
		t.Error("Expected updated to be yes")
	}
}

func TestBaseClient_doJSON_DecodeError(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		w.Write([]byte("invalid json"))
	}))
	defer server.Close()

	client := BaseClient{HTTPClient: server.Client(), BaseURL: server.URL}
	var result map[string]string
	err := client.Get(context.Background(), "/bad-json", nil, &result)
	if err == nil {
		t.Error("Expected error for invalid JSON")
	}
}