package semantic

import (
	"testing"

	"github.com/stretchr/testify/assert"

	"github.com/zzet/gortex/internal/graph"
)

func TestSymbolMap(t *testing.T) {
	m := NewSymbolMap()

	m.Add("scip::Foo", "main.go::Foo")
	m.Add("scip::Bar", "lib.go::Bar")

	assert.Equal(t, 2, m.Size())

	id, ok := m.GortexID("scip::Foo")
	assert.True(t, ok)
	assert.Equal(t, "main.go::Foo", id)

	ext, ok := m.ExternalID("lib.go::Bar")
	assert.True(t, ok)
	assert.Equal(t, "scip::Bar", ext)

	_, ok = m.GortexID("scip::Unknown")
	assert.False(t, ok)
}

func TestMatchNodeByFileLine(t *testing.T) {
	g := graph.New()
	g.AddNode(&graph.Node{
		ID: "main.go::main", Kind: graph.KindFunction, Name: "main",
		FilePath: "main.go", StartLine: 10, EndLine: 20,
	})
	g.AddNode(&graph.Node{
		ID: "main.go::helper", Kind: graph.KindFunction, Name: "helper",
		FilePath: "main.go", StartLine: 22, EndLine: 30,
	})
	g.AddNode(&graph.Node{
		ID: "main.go", Kind: graph.KindFile, Name: "main.go",
		FilePath: "main.go", StartLine: 1, EndLine: 30,
	})

	// Exact start line match.
	n := MatchNodeByFileLine(g, "main.go", 10)
	assert.NotNil(t, n)
	assert.Equal(t, "main.go::main", n.ID)

	// Within range.
	n = MatchNodeByFileLine(g, "main.go", 15)
	assert.NotNil(t, n)
	assert.Equal(t, "main.go::main", n.ID)

	// Second function.
	n = MatchNodeByFileLine(g, "main.go", 25)
	assert.NotNil(t, n)
	assert.Equal(t, "main.go::helper", n.ID)

	// Line in gap between functions — may or may not find a match.
	n = MatchNodeByFileLine(g, "main.go", 21)
	// Within tolerance of 2 lines from helper (line 22), should find it.
	if n != nil {
		assert.Equal(t, "main.go::helper", n.ID)
	}
}

func TestMatchNodeByQualName(t *testing.T) {
	g := graph.New()
	g.AddNode(&graph.Node{
		ID: "main.go::Foo", Kind: graph.KindFunction, Name: "Foo",
		QualName: "github.com/test/pkg.Foo", FilePath: "main.go",
	})

	n := MatchNodeByQualName(g, "github.com/test/pkg.Foo")
	assert.NotNil(t, n)
	assert.Equal(t, "main.go::Foo", n.ID)

	n = MatchNodeByQualName(g, "unknown")
	assert.Nil(t, n)
}

func TestMatchNodeByNameInFile(t *testing.T) {
	g := graph.New()
	g.AddNode(&graph.Node{
		ID: "main.go::Foo", Kind: graph.KindFunction, Name: "Foo",
		FilePath: "main.go",
	})

	n := MatchNodeByNameInFile(g, "Foo", "main.go")
	assert.NotNil(t, n)
	assert.Equal(t, "main.go::Foo", n.ID)

	n = MatchNodeByNameInFile(g, "Foo", "other.go")
	assert.Nil(t, n)
}

func TestParseGortexID(t *testing.T) {
	tests := []struct {
		id       string
		wantFile string
		wantSym  string
	}{
		{"main.go::Foo", "main.go", "Foo"},
		{"pkg/auth/token.go::ValidateToken", "pkg/auth/token.go", "ValidateToken"},
		{"main.go", "main.go", ""},
	}

	for _, tt := range tests {
		file, sym := ParseGortexID(tt.id)
		assert.Equal(t, tt.wantFile, file, "file for %s", tt.id)
		assert.Equal(t, tt.wantSym, sym, "sym for %s", tt.id)
	}
}

func TestNormalizeFilePath(t *testing.T) {
	result := NormalizeFilePath("/home/user/repo/pkg/foo.go", "/home/user/repo")
	assert.Equal(t, "pkg/foo.go", result)
}

func TestMatchCallableByFileLine(t *testing.T) {
	g := graph.New()
	// Function with a param decoy sharing its declaration line — the
	// zero-height param span wins MatchNodeByFileLine's innermost tie,
	// which is exactly what the callable matcher must NOT return.
	g.AddNode(&graph.Node{
		ID: "a.go::TestFoo", Kind: graph.KindFunction, Name: "TestFoo",
		FilePath: "a.go", StartLine: 10, EndLine: 20,
	})
	g.AddNode(&graph.Node{
		ID: "a.go::TestFoo#param:t", Kind: graph.KindParam, Name: "t",
		FilePath: "a.go", StartLine: 10, EndLine: 10,
	})
	g.AddNode(&graph.Node{
		ID: "a.go::TestFoo#closure:1", Kind: graph.KindClosure, Name: "closure",
		FilePath: "a.go", StartLine: 14, EndLine: 16,
	})
	g.AddNode(&graph.Node{
		ID: "a.go::Recv.M", Kind: graph.KindMethod, Name: "M",
		FilePath: "a.go", StartLine: 25, EndLine: 27,
	})
	g.AddNode(&graph.Node{
		ID: "a.go::topVar", Kind: graph.KindVariable, Name: "topVar",
		FilePath: "a.go", StartLine: 40, EndLine: 40,
	})
	g.AddNode(&graph.Node{
		ID: "a.go", Kind: graph.KindFile, Name: "a.go",
		FilePath: "a.go", StartLine: 1, EndLine: 50,
	})

	cases := []struct {
		name string
		line int
		want string // "" = nil expected
	}{
		{"declaration line beats param decoy", 10, "a.go::TestFoo"},
		{"body line inside function", 12, "a.go::TestFoo"},
		{"innermost closure wins inside its span", 15, "a.go::TestFoo#closure:1"},
		{"method declaration line", 25, "a.go::Recv.M"},
		{"near-miss within tolerance snaps to method", 23, "a.go::Recv.M"},
		{"variable line far from any callable", 40, ""},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			n := MatchCallableByFileLine(g, "a.go", tc.line)
			if tc.want == "" {
				assert.Nil(t, n)
				return
			}
			if assert.NotNil(t, n) {
				assert.Equal(t, tc.want, n.ID)
			}
		})
	}
}