package pgsql

import (
	"bytes"
	"strings"
	"testing"

	"git.warky.dev/wdevs/relspecgo/pkg/models"
	"git.warky.dev/wdevs/relspecgo/pkg/writers"
)

func TestCurrentColumnHasDescription(t *testing.T) {
	table := models.InitTable("users", "public")
	c := models.InitColumn("Email", "users", "public")
	c.Description = " the email "
	table.Columns["Email"] = c

	tests := []struct {
		name  string
		table *models.Table
		col   *models.Column
		want  bool
	}{
		{"nil table", nil, &models.Column{Name: "email", Description: "x"}, false},
		{"match ignoring case and whitespace", table, &models.Column{Name: "email", Description: "the email"}, true},
		{"different description", table, &models.Column{Name: "email", Description: "other"}, false},
		{"column missing", table, &models.Column{Name: "age", Description: "x"}, false},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := currentColumnHasDescription(tt.table, tt.col); got != tt.want {
				t.Errorf("got %v, want %v", got, tt.want)
			}
		})
	}
}

func TestExecuteCommentColumn(t *testing.T) {
	te, err := NewTemplateExecutor(false)
	if err != nil {
		t.Fatal(err)
	}
	got, err := te.ExecuteCommentColumn(CommentColumnData{
		SchemaName: "public", TableName: "users", ColumnName: "email", Comment: "it''s",
	})
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(got, "COMMENT ON COLUMN") || !strings.Contains(got, "public.users") ||
		!strings.Contains(got, "email") || !strings.Contains(got, "IS 'it''s';") {
		t.Errorf("unexpected output: %s", got)
	}
}

func migrationWithColumnDescription(t *testing.T, currentDesc string, withCurrentCol bool) string {
	t.Helper()
	newDB := func(desc string, include bool) *models.Database {
		db := models.InitDatabase("testdb")
		s := models.InitSchema("public")
		tbl := models.InitTable("users", "public")
		id := models.InitColumn("id", "users", "public")
		id.Type = "integer"
		tbl.Columns["id"] = id
		if include {
			col := models.InitColumn("email", "users", "public")
			col.Type = "text"
			col.Description = desc
			tbl.Columns["email"] = col
		}
		s.Tables = append(s.Tables, tbl)
		db.Schemas = append(db.Schemas, s)
		return db
	}
	model := newDB("it's the email", true)
	current := newDB(currentDesc, withCurrentCol)

	var buf bytes.Buffer
	w, err := NewMigrationWriter(&writers.WriterOptions{})
	if err != nil {
		t.Fatal(err)
	}
	w.writer = &buf
	if err := w.WriteMigration(model, current); err != nil {
		t.Fatal(err)
	}
	return buf.String()
}

func TestWriteMigration_ColumnComments(t *testing.T) {
	tests := []struct {
		name        string
		currentDesc string
		withCol     bool
		wantComment bool
	}{
		{"added", "", true, true},
		{"changed", "old text", true, true},
		{"unchanged", "it's the email", true, false},
		{"new column", "", false, true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			out := migrationWithColumnDescription(t, tt.currentDesc, tt.withCol)
			has := strings.Contains(out, "COMMENT ON COLUMN") && strings.Contains(out, "it''s the email")
			if has != tt.wantComment {
				t.Errorf("comment emitted = %v, want %v\n%s", has, tt.wantComment, out)
			}
		})
	}
}