package hclwrite

import (
	"bytes"
	"math/big"
	"testing"

	"github.com/google/go-cmp/cmp"
	"github.com/hashicorp/hcl/v2"
	"github.com/hashicorp/hcl/v2/hclsyntax"
	"github.com/zclconf/go-cty/cty"
)

func TestTokensForValue(t *testing.T) {
	tests := []struct {
		Val  cty.Value
		Want Tokens
	}{
		{
			cty.NullVal(cty.DynamicPseudoType),
			Tokens{
				{
					Type:  hclsyntax.TokenIdent,
					Bytes: []byte(`null`),
				},
			},
		},
		{
			cty.True,
			Tokens{
				{
					Type:  hclsyntax.TokenIdent,
					Bytes: []byte(`true`),
				},
			},
		},
		{
			cty.False,
			Tokens{
				{
					Type:  hclsyntax.TokenIdent,
					Bytes: []byte(`false`),
				},
			},
		},
		{
			cty.NumberIntVal(0),
			Tokens{
				{
					Type:  hclsyntax.TokenNumberLit,
					Bytes: []byte(`0`),
				},
			},
		},
		{
			cty.NumberFloatVal(0.5),
			Tokens{
				{
					Type:  hclsyntax.TokenNumberLit,
					Bytes: []byte(`0.5`),
				},
			},
		},
		{
			cty.NumberVal(big.NewFloat(0).SetPrec(512).Mul(big.NewFloat(40000000), big.NewFloat(2000000))),
			Tokens{
				{
					Type:  hclsyntax.TokenNumberLit,
					Bytes: []byte(`80000000000000`),
				},
			},
		},
		{
			cty.StringVal(""),
			Tokens{
				{
					Type:  hclsyntax.TokenOQuote,
					Bytes: []byte(`"`),
				},
				{
					Type:  hclsyntax.TokenCQuote,
					Bytes: []byte(`"`),
				},
			},
		},
		{
			cty.StringVal("foo"),
			Tokens{
				{
					Type:  hclsyntax.TokenOQuote,
					Bytes: []byte(`"`),
				},
				{
					Type:  hclsyntax.TokenQuotedLit,
					Bytes: []byte(`foo`),
				},
				{
					Type:  hclsyntax.TokenCQuote,
					Bytes: []byte(`"`),
				},
			},
		},
		{
			cty.StringVal(`"foo"`),
			Tokens{
				{
					Type:  hclsyntax.TokenOQuote,
					Bytes: []byte(`"`),
				},
				{
					Type:  hclsyntax.TokenQuotedLit,
					Bytes: []byte(`\"foo\"`),
				},
				{
					Type:  hclsyntax.TokenCQuote,
					Bytes: []byte(`"`),
				},
			},
		},
		{
			cty.StringVal("hello\nworld\n"),
			Tokens{
				{
					Type:  hclsyntax.TokenOQuote,
					Bytes: []byte(`"`),
				},
				{
					Type:  hclsyntax.TokenQuotedLit,
					Bytes: []byte(`hello\nworld\n`),
				},
				{
					Type:  hclsyntax.TokenCQuote,
					Bytes: []byte(`"`),
				},
			},
		},
		{
			cty.StringVal("hello\r\nworld\r\n"),
			Tokens{
				{
					Type:  hclsyntax.TokenOQuote,
					Bytes: []byte(`"`),
				},
				{
					Type:  hclsyntax.TokenQuotedLit,
					Bytes: []byte(`hello\r\nworld\r\n`),
				},
				{
					Type:  hclsyntax.TokenCQuote,
					Bytes: []byte(`"`),
				},
			},
		},
		{
			cty.StringVal(`what\what`),
			Tokens{
				{
					Type:  hclsyntax.TokenOQuote,
					Bytes: []byte(`"`),
				},
				{
					Type:  hclsyntax.TokenQuotedLit,
					Bytes: []byte(`what\\what`),
				},
				{
					Type:  hclsyntax.TokenCQuote,
					Bytes: []byte(`"`),
				},
			},
		},
		{
			cty.StringVal("𝄞"),
			Tokens{
				{
					Type:  hclsyntax.TokenOQuote,
					Bytes: []byte(`"`),
				},
				{
					Type:  hclsyntax.TokenQuotedLit,
					Bytes: []byte("𝄞"),
				},
				{
					Type:  hclsyntax.TokenCQuote,
					Bytes: []byte(`"`),
				},
			},
		},
		{
			cty.StringVal("👩🏾"),
			Tokens{
				{
					Type:  hclsyntax.TokenOQuote,
					Bytes: []byte(`"`),
				},
				{
					Type:  hclsyntax.TokenQuotedLit,
					Bytes: []byte(`👩🏾`),
				},
				{
					Type:  hclsyntax.TokenCQuote,
					Bytes: []byte(`"`),
				},
			},
		},
		{
			cty.EmptyTupleVal,
			Tokens{
				{
					Type:  hclsyntax.TokenOBrack,
					Bytes: []byte(`[`),
				},
				{
					Type:  hclsyntax.TokenCBrack,
					Bytes: []byte(`]`),
				},
			},
		},
		{
			cty.TupleVal([]cty.Value{cty.EmptyTupleVal}),
			Tokens{
				{
					Type:  hclsyntax.TokenOBrack,
					Bytes: []byte(`[`),
				},
				{
					Type:  hclsyntax.TokenOBrack,
					Bytes: []byte(`[`),
				},
				{
					Type:  hclsyntax.TokenCBrack,
					Bytes: []byte(`]`),
				},
				{
					Type:  hclsyntax.TokenCBrack,
					Bytes: []byte(`]`),
				},
			},
		},
		{
			cty.ListValEmpty(cty.String),
			Tokens{
				{
					Type:  hclsyntax.TokenOBrack,
					Bytes: []byte(`[`),
				},
				{
					Type:  hclsyntax.TokenCBrack,
					Bytes: []byte(`]`),
				},
			},
		},
		{
			cty.SetValEmpty(cty.Bool),
			Tokens{
				{
					Type:  hclsyntax.TokenOBrack,
					Bytes: []byte(`[`),
				},
				{
					Type:  hclsyntax.TokenCBrack,
					Bytes: []byte(`]`),
				},
			},
		},
		{
			cty.TupleVal([]cty.Value{cty.True}),
			Tokens{
				{
					Type:  hclsyntax.TokenOBrack,
					Bytes: []byte(`[`),
				},
				{
					Type:  hclsyntax.TokenIdent,
					Bytes: []byte(`true`),
				},
				{
					Type:  hclsyntax.TokenCBrack,
					Bytes: []byte(`]`),
				},
			},
		},
		{
			cty.TupleVal([]cty.Value{cty.True, cty.NumberIntVal(0)}),
			Tokens{
				{
					Type:  hclsyntax.TokenOBrack,
					Bytes: []byte(`[`),
				},
				{
					Type:  hclsyntax.TokenIdent,
					Bytes: []byte(`true`),
				},
				{
					Type:  hclsyntax.TokenComma,
					Bytes: []byte(`,`),
				},
				{
					Type:         hclsyntax.TokenNumberLit,
					Bytes:        []byte(`0`),
					SpacesBefore: 1,
				},
				{
					Type:  hclsyntax.TokenCBrack,
					Bytes: []byte(`]`),
				},
			},
		},
		{
			cty.EmptyObjectVal,
			Tokens{
				{
					Type:  hclsyntax.TokenOBrace,
					Bytes: []byte(`{`),
				},
				{
					Type:  hclsyntax.TokenCBrace,
					Bytes: []byte(`}`),
				},
			},
		},
		{
			cty.MapValEmpty(cty.Bool),
			Tokens{
				{
					Type:  hclsyntax.TokenOBrace,
					Bytes: []byte(`{`),
				},
				{
					Type:  hclsyntax.TokenCBrace,
					Bytes: []byte(`}`),
				},
			},
		},
		{
			cty.ObjectVal(map[string]cty.Value{
				"foo": cty.True,
			}),
			Tokens{
				{
					Type:  hclsyntax.TokenOBrace,
					Bytes: []byte(`{`),
				},
				{
					Type:  hclsyntax.TokenNewline,
					Bytes: []byte("\n"),
				},
				{
					Type:         hclsyntax.TokenIdent,
					Bytes:        []byte(`foo`),
					SpacesBefore: 2,
				},
				{
					Type:         hclsyntax.TokenEqual,
					Bytes:        []byte(`=`),
					SpacesBefore: 1,
				},
				{
					Type:         hclsyntax.TokenIdent,
					Bytes:        []byte(`true`),
					SpacesBefore: 1,
				},
				{
					Type:  hclsyntax.TokenNewline,
					Bytes: []byte("\n"),
				},
				{
					Type:  hclsyntax.TokenCBrace,
					Bytes: []byte(`}`),
				},
			},
		},
		{
			cty.ObjectVal(map[string]cty.Value{
				"foo": cty.True,
				"bar": cty.NumberIntVal(0),
			}),
			Tokens{
				{
					Type:  hclsyntax.TokenOBrace,
					Bytes: []byte(`{`),
				},
				{
					Type:  hclsyntax.TokenNewline,
					Bytes: []byte("\n"),
				},
				{
					Type:         hclsyntax.TokenIdent,
					Bytes:        []byte(`bar`),
					SpacesBefore: 2,
				},
				{
					Type:         hclsyntax.TokenEqual,
					Bytes:        []byte(`=`),
					SpacesBefore: 1,
				},
				{
					Type:         hclsyntax.TokenNumberLit,
					Bytes:        []byte(`0`),
					SpacesBefore: 1,
				},
				{
					Type:  hclsyntax.TokenNewline,
					Bytes: []byte("\n"),
				},
				{
					Type:         hclsyntax.TokenIdent,
					Bytes:        []byte(`foo`),
					SpacesBefore: 2,
				},
				{
					Type:         hclsyntax.TokenEqual,
					Bytes:        []byte(`=`),
					SpacesBefore: 1,
				},
				{
					Type:         hclsyntax.TokenIdent,
					Bytes:        []byte(`true`),
					SpacesBefore: 1,
				},
				{
					Type:  hclsyntax.TokenNewline,
					Bytes: []byte("\n"),
				},
				{
					Type:  hclsyntax.TokenCBrace,
					Bytes: []byte(`}`),
				},
			},
		},
		{
			cty.ObjectVal(map[string]cty.Value{
				"foo bar": cty.True,
			}),
			Tokens{
				{
					Type:  hclsyntax.TokenOBrace,
					Bytes: []byte(`{`),
				},
				{
					Type:  hclsyntax.TokenNewline,
					Bytes: []byte("\n"),
				},
				{
					Type:         hclsyntax.TokenOQuote,
					Bytes:        []byte(`"`),
					SpacesBefore: 2,
				},
				{
					Type:  hclsyntax.TokenQuotedLit,
					Bytes: []byte(`foo bar`),
				},
				{
					Type:  hclsyntax.TokenCQuote,
					Bytes: []byte(`"`),
				},
				{
					Type:         hclsyntax.TokenEqual,
					Bytes:        []byte(`=`),
					SpacesBefore: 1,
				},
				{
					Type:         hclsyntax.TokenIdent,
					Bytes:        []byte(`true`),
					SpacesBefore: 1,
				},
				{
					Type:  hclsyntax.TokenNewline,
					Bytes: []byte("\n"),
				},
				{
					Type:  hclsyntax.TokenCBrace,
					Bytes: []byte(`}`),
				},
			},
		},
	}

	for _, test := range tests {
		t.Run(test.Val.GoString(), func(t *testing.T) {
			got := TokensForValue(test.Val)

			if !cmp.Equal(got, test.Want) {
				diff := cmp.Diff(got, test.Want, cmp.Comparer(func(a, b []byte) bool {
					return bytes.Equal(a, b)
				}))
				var gotBuf, wantBuf bytes.Buffer
				got.WriteTo(&gotBuf)
				test.Want.WriteTo(&wantBuf)
				t.Errorf(
					"wrong result\nvalue: %#v\ngot:   %s\nwant:  %s\ndiff:  %s",
					test.Val, gotBuf.String(), wantBuf.String(), diff,
				)
			}
		})
	}
}

func TestTokensForTraversal(t *testing.T) {
	tests := []struct {
		Val  hcl.Traversal
		Want Tokens
	}{
		{
			hcl.Traversal{
				hcl.TraverseRoot{Name: "root"},
				hcl.TraverseAttr{Name: "attr"},
				hcl.TraverseIndex{Key: cty.StringVal("index")},
			},
			Tokens{
				{Type: hclsyntax.TokenIdent, Bytes: []byte("root")},
				{Type: hclsyntax.TokenDot, Bytes: []byte(".")},
				{Type: hclsyntax.TokenIdent, Bytes: []byte("attr")},
				{Type: hclsyntax.TokenOBrack, Bytes: []byte{'['}},
				{Type: hclsyntax.TokenOQuote, Bytes: []byte(`"`)},
				{Type: hclsyntax.TokenQuotedLit, Bytes: []byte("index")},
				{Type: hclsyntax.TokenCQuote, Bytes: []byte(`"`)},
				{Type: hclsyntax.TokenCBrack, Bytes: []byte{']'}},
			},
		},
	}

	for _, test := range tests {
		got := TokensForTraversal(test.Val)

		if !cmp.Equal(got, test.Want) {
			diff := cmp.Diff(got, test.Want, cmp.Comparer(func(a, b []byte) bool {
				return bytes.Equal(a, b)
			}))
			var gotBuf, wantBuf bytes.Buffer
			got.WriteTo(&gotBuf)
			test.Want.WriteTo(&wantBuf)
			t.Errorf(
				"wrong result\nvalue: %#v\ngot:   %s\nwant:  %s\ndiff:  %s",
				test.Val, gotBuf.String(), wantBuf.String(), diff,
			)
		}
	}
}
