package pgsql

import (
	"bytes"
	"strings"
	"testing"

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

func TestWriteMigration_NewTable(t *testing.T) {
	// Current database (empty)
	current := models.InitDatabase("testdb")
	currentSchema := models.InitSchema("public")
	current.Schemas = append(current.Schemas, currentSchema)

	// Model database (with new table)
	model := models.InitDatabase("testdb")
	modelSchema := models.InitSchema("public")

	table := models.InitTable("users", "public")
	idCol := models.InitColumn("id", "users", "public")
	idCol.Type = "integer"
	idCol.NotNull = true
	table.Columns["id"] = idCol

	nameCol := models.InitColumn("name", "users", "public")
	nameCol.Type = "text"
	table.Columns["name"] = nameCol

	modelSchema.Tables = append(modelSchema.Tables, table)
	model.Schemas = append(model.Schemas, modelSchema)

	// Generate migration
	var buf bytes.Buffer
	writer, err := NewMigrationWriter(&writers.WriterOptions{})
	if err != nil {
		t.Fatalf("Failed to create writer: %v", err)
	}
	writer.writer = &buf

	err = writer.WriteMigration(model, current)
	if err != nil {
		t.Fatalf("WriteMigration failed: %v", err)
	}

	output := buf.String()
	t.Logf("Generated migration:\n%s", output)

	// Verify CREATE TABLE is present
	if !strings.Contains(output, "CREATE TABLE") {
		t.Error("Migration missing CREATE TABLE statement")
	}
	if !strings.Contains(output, "users") {
		t.Error("Migration missing table name 'users'")
	}
}

func TestWriteMigration_WithAudit(t *testing.T) {
	// Current database (empty)
	current := models.InitDatabase("testdb")
	currentSchema := models.InitSchema("public")
	current.Schemas = append(current.Schemas, currentSchema)

	// Model database (with table to audit)
	model := models.InitDatabase("testdb")
	modelSchema := models.InitSchema("public")

	table := models.InitTable("users", "public")

	idCol := models.InitColumn("id", "users", "public")
	idCol.Type = "integer"
	idCol.IsPrimaryKey = true
	table.Columns["id"] = idCol

	nameCol := models.InitColumn("name", "users", "public")
	nameCol.Type = "text"
	table.Columns["name"] = nameCol

	passwordCol := models.InitColumn("password", "users", "public")
	passwordCol.Type = "text"
	table.Columns["password"] = passwordCol

	modelSchema.Tables = append(modelSchema.Tables, table)
	model.Schemas = append(model.Schemas, modelSchema)

	// Configure audit
	auditConfig := NewAuditConfig()
	auditConfig.AuditSchema = "public"
	tableConfig := auditConfig.EnableTableAudit("public", "users")
	tableConfig.EncryptedColumns = []string{"password"}

	// Generate migration with audit
	var buf bytes.Buffer
	options := &writers.WriterOptions{
		Metadata: map[string]interface{}{
			"audit_config": auditConfig,
		},
	}
	writer, err := NewMigrationWriter(options)
	if err != nil {
		t.Fatalf("Failed to create writer: %v", err)
	}
	writer.writer = &buf

	err = writer.WriteMigration(model, current)
	if err != nil {
		t.Fatalf("WriteMigration failed: %v", err)
	}

	output := buf.String()
	t.Logf("Generated migration with audit:\n%s", output)

	// Verify audit tables
	if !strings.Contains(output, "CREATE TABLE IF NOT EXISTS public.atevent") {
		t.Error("Migration missing atevent table")
	}
	if !strings.Contains(output, "CREATE TABLE IF NOT EXISTS public.atdetail") {
		t.Error("Migration missing atdetail table")
	}

	// Verify audit function
	if !strings.Contains(output, "CREATE OR REPLACE FUNCTION public.ft_audit_users()") {
		t.Error("Migration missing audit function")
	}

	// Verify audit trigger
	if !strings.Contains(output, "CREATE TRIGGER t_audit_users") {
		t.Error("Migration missing audit trigger")
	}

	// Verify encrypted column handling
	if !strings.Contains(output, "'****************'") {
		t.Error("Migration missing encrypted column handling")
	}
}

func TestTemplateExecutor_CreateTable(t *testing.T) {
	executor, err := NewTemplateExecutor()
	if err != nil {
		t.Fatalf("Failed to create executor: %v", err)
	}

	data := CreateTableData{
		SchemaName: "public",
		TableName:  "test_table",
		Columns: []ColumnData{
			{Name: "id", Type: "integer", NotNull: true},
			{Name: "name", Type: "text", Default: "'unknown'"},
		},
	}

	sql, err := executor.ExecuteCreateTable(data)
	if err != nil {
		t.Fatalf("Failed to execute template: %v", err)
	}

	t.Logf("Generated SQL:\n%s", sql)

	if !strings.Contains(sql, "CREATE TABLE IF NOT EXISTS public.test_table") {
		t.Error("SQL missing CREATE TABLE statement")
	}
	if !strings.Contains(sql, "id integer NOT NULL") {
		t.Error("SQL missing id column definition")
	}
	if !strings.Contains(sql, "name text DEFAULT 'unknown'") {
		t.Error("SQL missing name column definition")
	}
}

func TestTemplateExecutor_AuditFunction(t *testing.T) {
	executor, err := NewTemplateExecutor()
	if err != nil {
		t.Fatalf("Failed to create executor: %v", err)
	}

	data := AuditFunctionData{
		SchemaName:      "public",
		FunctionName:    "ft_audit_users",
		TableName:       "users",
		TablePrefix:     "NULL",
		PrimaryKey:      "id",
		AuditSchema:     "public",
		UserFunction:    "current_user",
		AuditInsert:     true,
		AuditUpdate:     true,
		AuditDelete:     true,
		UpdateCondition: "old.name IS DISTINCT FROM new.name",
		UpdateColumns: []AuditColumnData{
			{Name: "name", OldValue: "old.name::text", NewValue: "new.name::text"},
		},
		DeleteColumns: []AuditColumnData{
			{Name: "name", OldValue: "old.name::text"},
		},
	}

	sql, err := executor.ExecuteAuditFunction(data)
	if err != nil {
		t.Fatalf("Failed to execute template: %v", err)
	}

	t.Logf("Generated SQL:\n%s", sql)

	if !strings.Contains(sql, "CREATE OR REPLACE FUNCTION public.ft_audit_users()") {
		t.Error("SQL missing function definition")
	}
	if !strings.Contains(sql, "IF TG_OP = 'INSERT'") {
		t.Error("SQL missing INSERT handling")
	}
	if !strings.Contains(sql, "ELSIF TG_OP = 'UPDATE'") {
		t.Error("SQL missing UPDATE handling")
	}
	if !strings.Contains(sql, "ELSIF TG_OP = 'DELETE'") {
		t.Error("SQL missing DELETE handling")
	}
}