package io

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

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

// webSearchToolForTest builds a tools set with opts and returns the web-search
// tool.
func webSearchToolForTest(t *testing.T, opts ...Option) *webSearchTool {
	t.Helper()
	return findTool(t, buildTools(t, &config.Config{}, opts...), "web-search").(*webSearchTool)
}

func TestWebSearch_NoEndpoint(t *testing.T) {
	t.Parallel()
	ws := webSearchToolForTest(t) // no endpoint configured
	_, err := ws.Execute(context.Background(), map[string]any{"query": "cyrene"})
	if err == nil || !strings.Contains(err.Error(), "no search endpoint") {
		t.Fatalf("expected no-endpoint error, got %v", err)
	}
}

func TestWebSearch_Query(t *testing.T) {
	t.Parallel()
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Query().Get("q") != "cyrene" {
			t.Errorf("query param q = %q", r.URL.Query().Get("q"))
		}
		if r.URL.Query().Get("format") != "json" {
			t.Errorf("format = %q", r.URL.Query().Get("format"))
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = io.WriteString(w, `{"results":[
			{"title":"A","url":"http://a.example","content":"alpha"},
			{"title":"B","url":"http://b.example","snippet":"beta"}
		]}`)
	}))
	defer srv.Close()
	ws := webSearchToolForTest(t,
		WithSearchEndpoint(srv.URL),
		WithAllowedHosts(serverHost(srv)),
		WithHTTPClient(srv.Client()),
	)

	got, err := ws.Execute(context.Background(), map[string]any{"query": "cyrene", "count": 2})
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}
	m := got.(map[string]any)
	if m["count"].(int) != 2 {
		t.Fatalf("count = %v", m["count"])
	}
	results := m["results"].([]searchResult)
	if results[0].Title != "A" || results[0].Content != "alpha" {
		t.Fatalf("result[0] = %+v", results[0])
	}
	if results[1].Content != "beta" {
		t.Fatalf("result[1] snippet fallback = %+v", results[1])
	}
}

func TestWebSearch_SizeLimit(t *testing.T) {
	t.Parallel()
	big := strings.Repeat("a", 64)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = io.WriteString(w, big)
	}))
	defer srv.Close()
	ws := webSearchToolForTest(t,
		WithSearchEndpoint(srv.URL),
		WithAllowedHosts(serverHost(srv)),
		WithHTTPClient(srv.Client()),
		WithHTTPResponseLimit(16),
	)
	_, err := ws.Execute(context.Background(), map[string]any{"query": "cyrene"})
	if err == nil || !strings.Contains(err.Error(), "exceeds the 16-byte limit") {
		t.Fatalf("expected size-limit error, got %v", err)
	}
}

func TestWebSearch_CountCapped(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, `{"results":[{"title":"A","url":"http://a","content":"x"}]}`)
	}))
	defer srv.Close()
	ws := webSearchToolForTest(t,
		WithSearchEndpoint(srv.URL),
		WithAllowedHosts(serverHost(srv)),
		WithHTTPClient(srv.Client()),
		WithMaxResults(0), // ignored; default 10
		WithMaxResults(1),
	)
	got, err := ws.Execute(context.Background(), map[string]any{"query": "cyrene"})
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}
	if m := got.(map[string]any); m["count"].(int) != 1 {
		t.Fatalf("count = %v", m["count"])
	}
}