package exporter

import (
	"strings"
	"testing"
	"time"

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

type spannerTables struct {
	TableOne []spTableOneRow
	TableTwo []spTableTwoRow
}

type spTableOneRow struct {
	ColumnOne   string `sql:"column_one STRING PRIMARY KEY"`
	ColumnTwo   int    `sql:"column_two INT8 NOT NULL"`
	ColumnThree int    `sql:"column_three INT unique_rowid()"`
	// CreatedAt indicates the time at which this row was created.
	CreatedAt time.Time `sql:"createdat TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP"`
}

type spTableTwoRow struct {
	CompositeKeyOne []byte `sql:"comp_one BYTES"`
	CompositeKeyTwo []byte `sql:"comp_two BYTES"`
	// CreatedAt indicates the time at which this row was created.
	CreatedAt time.Time `sql:"createdat TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP"`
	// This is a test comment
	primaryKey struct{} `sql:"PRIMARY KEY (comp_one, comp_two)"`
	// We have this index for good reasons. Spaces are intentional to make sure they are trimmed
	indexForSearch struct{} `sql:"   INDEX comp_two_desc_idx (comp_two DESC)   "`
	// We have this index for even better reasons.
	otherIndex struct{} `sql:"INDEX comp_two_asc_idx (comp_two ASC)"`
}

func TestSpanner_GenerateSQL_WellFormedInput_CorrectOutput(t *testing.T) {

	gen := GenerateSQL(spannerTables{}, "test_package_one", SchemaOnly, Spanner, &SpannerConverter{SkipCreatedAt: true})
	// We cannot have backticks in the multistring literal, so we substitute $$ for them.
	expectedOutput := strings.ReplaceAll(`package test_package_one

// Generated by //go/sql/exporter/
// DO NOT EDIT

const Schema = $$CREATE SEQUENCE IF NOT EXISTS TableOne_seq bit_reversed_positive;
CREATE TABLE IF NOT EXISTS TableOne (
  column_one TEXT PRIMARY KEY,
  column_two INT8 NOT NULL,
  column_three INT nextval('TableOne_seq'),
  createdat TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
) TTL INTERVAL '1095 days' ON createdat;
CREATE TABLE IF NOT EXISTS TableTwo (
  comp_one BYTEA,
  comp_two BYTEA,
  createdat TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (comp_one, comp_two)
) TTL INTERVAL '1095 days' ON createdat;
CREATE INDEX IF NOT EXISTS comp_two_desc_idx on TableTwo (comp_two DESC);
CREATE INDEX IF NOT EXISTS comp_two_asc_idx on TableTwo (comp_two ASC);
$$
`, "$$", "`")

	assert.Equal(t, expectedOutput, gen)
}

func TestSpanner_GenerateSQL_WellFormedInput_CorrectOutputIncludingColumnNames(t *testing.T) {
	spannerConverter := DefaultSpannerConverter()
	spannerConverter.SkipCreatedAt = true

	gen := GenerateSQL(spannerTables{}, "test_package_one", SchemaAndColumnNames, Spanner, spannerConverter)
	// We cannot have backticks in the multistring literal, so we substitute $$ for them.
	expectedOutput := strings.ReplaceAll(`package test_package_one

// Generated by //go/sql/exporter/
// DO NOT EDIT

const Schema = $$CREATE SEQUENCE IF NOT EXISTS TableOne_seq bit_reversed_positive;
CREATE TABLE IF NOT EXISTS TableOne (
  column_one TEXT PRIMARY KEY,
  column_two INT8 NOT NULL,
  column_three INT nextval('TableOne_seq'),
  createdat TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
) TTL INTERVAL '1095 days' ON createdat;
CREATE TABLE IF NOT EXISTS TableTwo (
  comp_one BYTEA,
  comp_two BYTEA,
  createdat TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (comp_one, comp_two)
) TTL INTERVAL '1095 days' ON createdat;
CREATE INDEX IF NOT EXISTS comp_two_desc_idx on TableTwo (comp_two DESC);
CREATE INDEX IF NOT EXISTS comp_two_asc_idx on TableTwo (comp_two ASC);
$$

var TableOne = []string{
	"column_one",
	"column_two",
	"column_three",
	"createdat",
}

var TableTwo = []string{
	"comp_one",
	"comp_two",
	"createdat",
}
`, "$$", "`")

	assert.Equal(t, expectedOutput, gen)
}

func TestSpanner_GenerateSQL_WellFormedInput_TTLExclude(t *testing.T) {
	// This table should not have a "TTL INTERVAL" specified.
	excludeTTLTable := []string{"TableOne"}
	spannerConverter := DefaultSpannerConverter()
	spannerConverter.TtlExcludeTables = excludeTTLTable
	spannerConverter.SkipCreatedAt = true
	gen := GenerateSQL(spannerTables{}, "test_package_one", SchemaOnly, Spanner, spannerConverter)
	// We cannot have backticks in the multistring literal, so we substitute $$ for them.
	expectedOutput := strings.ReplaceAll(`package test_package_one

// Generated by //go/sql/exporter/
// DO NOT EDIT

const Schema = $$CREATE SEQUENCE IF NOT EXISTS TableOne_seq bit_reversed_positive;
CREATE TABLE IF NOT EXISTS TableOne (
  column_one TEXT PRIMARY KEY,
  column_two INT8 NOT NULL,
  column_three INT nextval('TableOne_seq'),
  createdat TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
);
CREATE TABLE IF NOT EXISTS TableTwo (
  comp_one BYTEA,
  comp_two BYTEA,
  createdat TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (comp_one, comp_two)
) TTL INTERVAL '1095 days' ON createdat;
CREATE INDEX IF NOT EXISTS comp_two_desc_idx on TableTwo (comp_two DESC);
CREATE INDEX IF NOT EXISTS comp_two_asc_idx on TableTwo (comp_two ASC);
$$
`, "$$", "`")

	assert.Equal(t, expectedOutput, gen)
}

type spannerMalformedTable struct {
	TableOne []tableOneRow
	TableTwo tableTwoRow
}

func TestSpanner_GenerateSQL_NonSliceField_Panics(t *testing.T) {

	assert.Panics(t, func() {
		GenerateSQL(spannerMalformedTable{}, "test_package_one", SchemaOnly, Spanner, nil)
	})
}

type spannerMissingSQLStructs struct {
	TableOne []tableOneRow
	TableTwo []malformedTable
}

func TestSpanner_GenerateSQL_MissingSQLStructTag_Panics(t *testing.T) {

	assert.Panics(t, func() {
		GenerateSQL(spannerMissingSQLStructs{}, "test_package_one", SchemaOnly, Spanner, nil)
	})
}