package engine_test

import (
	"context"
	"testing"

	"github.com/salvacybersec/keyhunter/pkg/engine"
	"github.com/salvacybersec/keyhunter/pkg/engine/sources"
	"github.com/salvacybersec/keyhunter/pkg/providers"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func newTestRegistry(t *testing.T) *providers.Registry {
	t.Helper()
	reg, err := providers.NewRegistry()
	require.NoError(t, err)
	return reg
}

func TestShannonEntropy(t *testing.T) {
	assert.InDelta(t, 0.0, engine.Shannon("aaaaaaa"), 0.01)
	assert.Greater(t, engine.Shannon("sk-proj-ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqr"), 3.5)
	assert.Equal(t, 0.0, engine.Shannon(""))
}

func TestKeywordPreFilter(t *testing.T) {
	reg := newTestRegistry(t)
	ac := reg.AC()

	// Chunk with OpenAI keyword should pass
	matches := ac.FindAll("export OPENAI_API_KEY=sk-proj-test")
	assert.NotEmpty(t, matches)

	// Chunk with no keywords should be dropped
	noMatches := ac.FindAll("hello world no secrets here")
	assert.Empty(t, noMatches)
}

func TestScannerPipelineOpenAI(t *testing.T) {
	reg := newTestRegistry(t)
	eng := engine.NewEngine(reg)
	src := sources.NewFileSource("../../testdata/samples/openai_key.txt")
	cfg := engine.ScanConfig{Workers: 2}

	ch, err := eng.Scan(context.Background(), src, cfg)
	require.NoError(t, err)

	var findings []engine.Finding
	for f := range ch {
		findings = append(findings, f)
	}

	require.NotEmpty(t, findings, "expected at least 1 finding in openai_key.txt")
	var names []string
	for _, f := range findings {
		names = append(names, f.ProviderName)
	}
	assert.Contains(t, names, "openai", "expected openai provider in findings")
}

func TestScannerPipelineAnthropic(t *testing.T) {
	reg := newTestRegistry(t)
	eng := engine.NewEngine(reg)
	src := sources.NewFileSource("../../testdata/samples/anthropic_key.txt")
	cfg := engine.ScanConfig{Workers: 2}

	ch, err := eng.Scan(context.Background(), src, cfg)
	require.NoError(t, err)

	var findings []engine.Finding
	for f := range ch {
		findings = append(findings, f)
	}

	require.NotEmpty(t, findings, "expected at least 1 finding in anthropic_key.txt")
	var names []string
	for _, f := range findings {
		names = append(names, f.ProviderName)
	}
	assert.Contains(t, names, "anthropic", "expected anthropic provider in findings")
}

func TestScannerPipelineNoKeys(t *testing.T) {
	reg := newTestRegistry(t)
	eng := engine.NewEngine(reg)
	src := sources.NewFileSource("../../testdata/samples/no_keys.txt")
	cfg := engine.ScanConfig{Workers: 2}

	ch, err := eng.Scan(context.Background(), src, cfg)
	require.NoError(t, err)

	var findings []engine.Finding
	for f := range ch {
		findings = append(findings, f)
	}

	assert.Empty(t, findings, "expected zero findings in no_keys.txt")
}

func TestScannerPipelineMultipleKeys(t *testing.T) {
	reg := newTestRegistry(t)
	eng := engine.NewEngine(reg)
	src := sources.NewFileSource("../../testdata/samples/multiple_keys.txt")
	cfg := engine.ScanConfig{Workers: 2}

	ch, err := eng.Scan(context.Background(), src, cfg)
	require.NoError(t, err)

	var findings []engine.Finding
	for f := range ch {
		findings = append(findings, f)
	}

	assert.GreaterOrEqual(t, len(findings), 2, "expected at least 2 findings in multiple_keys.txt")

	var names []string
	for _, f := range findings {
		names = append(names, f.ProviderName)
	}
	assert.Contains(t, names, "openai")
	assert.Contains(t, names, "anthropic")
}