package main

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func okServer(t *testing.T) *httptest.Server {
	t.Helper()
	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	}))
}

func TestRunTier_Full_Human(t *testing.T) {
	anthropic := okServer(t)
	defer anthropic.Close()
	litellm := okServer(t)
	defer litellm.Close()

	t.Setenv("ANTHROPIC_PROBE_URL", anthropic.URL)
	t.Setenv("LITELLM_BASE_URL", litellm.URL)

	var out, errBuf bytes.Buffer
	err := runTier(context.Background(), []string{}, strings.NewReader(""), &out, &errBuf)
	require.NoError(t, err)
	assert.Contains(t, out.String(), "tier 1")
	assert.Contains(t, out.String(), "full-online")
	assert.Contains(t, out.String(), "managed_agents=true")
}

func TestRunTier_LANOnly_JSON(t *testing.T) {
	litellm := okServer(t)
	defer litellm.Close()

	t.Setenv("ANTHROPIC_PROBE_URL", "http://127.0.0.1:1") // unreachable
	t.Setenv("LITELLM_BASE_URL", litellm.URL)

	var out, errBuf bytes.Buffer
	err := runTier(context.Background(), []string{"--json"}, strings.NewReader(""), &out, &errBuf)
	require.NoError(t, err)

	var got struct {
		Tier          int    `json:"tier"`
		Label         string `json:"label"`
		ManagedAgents bool   `json:"managed_agents"`
	}
	require.NoError(t, json.Unmarshal(out.Bytes(), &got))
	assert.Equal(t, 2, got.Tier)
	assert.Equal(t, "lan-only", got.Label)
	assert.False(t, got.ManagedAgents)
}

func TestRunTier_Airplane_NoLiteLLMBaseURL(t *testing.T) {
	t.Setenv("ANTHROPIC_PROBE_URL", "http://127.0.0.1:1")
	t.Setenv("LITELLM_BASE_URL", "")

	var out, errBuf bytes.Buffer
	err := runTier(context.Background(), []string{}, strings.NewReader(""), &out, &errBuf)
	require.NoError(t, err)
	assert.Contains(t, out.String(), "tier 3")
	assert.Contains(t, out.String(), "airplane")
}

func TestRunTier_UnknownFlag_ReturnsError(t *testing.T) {
	var out, errBuf bytes.Buffer
	err := runTier(context.Background(), []string{"--bogus"}, strings.NewReader(""), &out, &errBuf)
	assert.Error(t, err)
}