package io

import (
	"context"
	"errors"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

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

// httpToolForTest builds a tools set with opts and returns the http tool.
func httpToolForTest(t *testing.T, opts ...Option) *httpTool {
	t.Helper()
	return findTool(t, buildTools(t, &config.Config{}, opts...), "http").(*httpTool)
}

func TestHTTPTool_Get(t *testing.T) {
	t.Parallel()
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = io.WriteString(w, `{"ok":true,"path":"`+r.URL.Path+`"}`)
	}))
	defer srv.Close()
	ht := httpToolForTest(t, WithAllowedHosts(serverHost(srv)), WithHTTPClient(srv.Client()))

	got, err := ht.Execute(context.Background(), map[string]any{"method": "GET", "url": srv.URL + "/hello"})
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}
	m := got.(map[string]any)
	if m["status"] != http.StatusOK {
		t.Fatalf("status = %v", m["status"])
	}
	body := m["body"].(string)
	if !strings.Contains(body, `"ok":true`) || !strings.Contains(body, "/hello") {
		t.Fatalf("body = %q", body)
	}
	if m["truncated"].(bool) {
		t.Fatal("unexpected truncation")
	}
}

func TestHTTPTool_Post(t *testing.T) {
	t.Parallel()
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			t.Fatalf("method = %s", r.Method)
		}
		body, _ := io.ReadAll(r.Body)
		w.Header().Set("Content-Type", "text/plain")
		_, _ = w.Write(body)
	}))
	defer srv.Close()
	ht := httpToolForTest(t, WithAllowedHosts(serverHost(srv)), WithHTTPClient(srv.Client()))

	got, err := ht.Execute(context.Background(), map[string]any{
		"method":  "POST",
		"url":     srv.URL,
		"body":    "name=cyrene",
		"headers": map[string]any{"Content-Type": "application/x-www-form-urlencoded"},
	})
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}
	if body := got.(map[string]any)["body"].(string); body != "name=cyrene" {
		t.Fatalf("echoed body = %q", body)
	}
}

func TestHTTPTool_UnsupportedMethod(t *testing.T) {
	t.Parallel()
	ht := httpToolForTest(t)
	_, err := ht.Execute(context.Background(), map[string]any{"method": "DELETE", "url": "http://example.com"})
	if err == nil || !strings.Contains(err.Error(), "unsupported method") {
		t.Fatalf("expected unsupported-method error, got %v", err)
	}
}

func TestHTTPTool_Timeout(t *testing.T) {
	t.Parallel()
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		time.Sleep(200 * time.Millisecond)
		_, _ = w.Write([]byte("late"))
	}))
	defer srv.Close()
	ht := httpToolForTest(t, WithAllowedHosts(serverHost(srv)), WithHTTPTimeout(30*time.Millisecond))

	_, err := ht.Execute(context.Background(), map[string]any{"method": "GET", "url": srv.URL})
	if err == nil {
		t.Fatal("expected timeout error")
	}
}

func TestHTTPTool_RejectsBadContentType(t *testing.T) {
	t.Parallel()
	ht := httpToolForTest(t)
	_, err := ht.Execute(context.Background(), map[string]any{
		"method":  "POST",
		"url":     "http://93.184.216.34/",
		"body":    "x",
		"headers": map[string]any{"Content-Type": "not a real content type {{"},
	})
	if err == nil || !strings.Contains(err.Error(), "invalid content-type") {
		t.Fatalf("expected invalid content-type error, got %v", err)
	}
}

func TestHTTPTool_ResponseTruncation(t *testing.T) {
	t.Parallel()
	payload := strings.Repeat("a", 5000)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = io.WriteString(w, payload)
	}))
	defer srv.Close()
	ht := httpToolForTest(t, WithAllowedHosts(serverHost(srv)), WithHTTPClient(srv.Client()), WithHTTPResponseLimit(1000))

	got, err := ht.Execute(context.Background(), map[string]any{"method": "GET", "url": srv.URL})
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}
	m := got.(map[string]any)
	if !m["truncated"].(bool) {
		t.Fatal("expected truncated=true")
	}
	if body := m["body"].(string); len(body) != 1000 {
		t.Fatalf("body len = %d", len(body))
	}
}

func TestHTTPTool_SSRFDenied(t *testing.T) {
	t.Parallel()
	ht := httpToolForTest(t) // no whitelist
	cases := []string{
		"http://127.0.0.1:9/",
		"http://localhost:9/",
		"http://10.0.0.1/",
		"http://172.16.0.1/",
		"http://192.168.1.1/",
		"http://169.254.1.1/",
		"http://0.0.0.0/",
		"http://[::1]:9/",
	}
	for _, u := range cases {
		_, err := ht.Execute(context.Background(), map[string]any{"method": "GET", "url": u})
		if !errors.Is(err, ErrSSRF) {
			t.Fatalf("url %q: expected ErrSSRF, got %v", u, err)
		}
	}
}

func TestHTTPTool_SSRFAllowedViaWhitelist(t *testing.T) {
	t.Parallel()
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = io.WriteString(w, "ok")
	}))
	defer srv.Close()
	ht := httpToolForTest(t, WithAllowedHosts(serverHost(srv)), WithHTTPClient(srv.Client()))

	got, err := ht.Execute(context.Background(), map[string]any{"method": "GET", "url": srv.URL})
	if err != nil {
		t.Fatalf("Execute (whitelisted): %v", err)
	}
	if body := got.(map[string]any)["body"].(string); body != "ok" {
		t.Fatalf("body = %q", body)
	}
}

func TestHTTPTool_UnsupportedScheme(t *testing.T) {
	t.Parallel()
	ht := httpToolForTest(t)
	_, err := ht.Execute(context.Background(), map[string]any{"method": "GET", "url": "ftp://example.com/x"})
	if err == nil || !strings.Contains(err.Error(), "unsupported scheme") {
		t.Fatalf("expected unsupported-scheme error, got %v", err)
	}
}

func TestHTTPTool_MissingURL(t *testing.T) {
	t.Parallel()
	ht := httpToolForTest(t)
	_, err := ht.Execute(context.Background(), map[string]any{"method": "GET"})
	if err == nil || !strings.Contains(err.Error(), "url is required") {
		t.Fatalf("expected url-required error, got %v", err)
	}
}