package engine_test

import (
	"testing"
	"time"

	"git.fsdpf.net/go/db/engine"
	_ "github.com/denisenkom/go-mssqldb"
	_ "github.com/go-sql-driver/mysql"
	_ "github.com/mattn/go-sqlite3"
)

// TestMySQLConfig 测试 MySQL 驱动的配置
func TestMySQLConfig(t *testing.T) {
	tests := []struct {
		name    string
		options []engine.Option
		wantErr bool
		errMsg  string
	}{
		{
			name: "Valid Config",
			options: []engine.Option{
				engine.WithHost("localhost"),
				engine.WithDatabase("testdb"),
				engine.WithUsername("root"),
				engine.WithPassword("password"),
				engine.WithMySQLCollation("utf8mb4_unicode_ci"),
			},
			wantErr: false,
		},
		{
			name: "Missing Host",
			options: []engine.Option{
				engine.WithDatabase("testdb"),
				engine.WithUsername("root"),
				engine.WithPassword("password"),
			},
			wantErr: true,
			errMsg:  "Host, ReadHosts, or WriteHosts is required for mysql driver",
		},
		{
			name: "Missing Database",
			options: []engine.Option{
				engine.WithHost("localhost"),
				engine.WithUsername("root"),
				engine.WithPassword("password"),
			},
			wantErr: true,
			errMsg:  "Database is required for mysql driver",
		},
		{
			name: "engine.engine.With SQL Server engine.Option",
			options: []engine.Option{
				engine.WithHost("localhost"),
				engine.WithDatabase("testdb"),
				engine.WithUsername("root"),
				engine.WithPassword("password"),
				engine.WithSQLServerInstance("SQLEXPRESS"),
			},
			wantErr: true,
			errMsg:  "engine.WithSQLServerInstance is only valid for sqlserver driver",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			defer func() {
				if r := recover(); r != nil {
					if !tt.wantErr {
						t.Errorf("engine.NewDBConfig() panicked unexpectedly: %v", r)
					} else if tt.errMsg != "" && r != tt.errMsg {
						t.Errorf("engine.NewDBConfig() panic = %v, want %v", r, tt.errMsg)
					}
				} else if tt.wantErr {
					t.Errorf("engine.NewDBConfig() did not panic, expected panic with: %v", tt.errMsg)
				}
			}()

			config := engine.NewDBConfig("mysql", tt.options...)
			if !tt.wantErr && (config.Driver != "mysql" || config.MySQL.Collation != "utf8mb4_unicode_ci") {
				t.Errorf("MySQL config not set correctly: %+v", config)
			}
		})
	}
}

// TestPostgreSQLConfig 测试 PostgreSQL 驱动的配置
func TestPostgreSQLConfig(t *testing.T) {
	tests := []struct {
		name    string
		options []engine.Option
		wantErr bool
		errMsg  string
	}{
		{
			name: "Valid Config",
			options: []engine.Option{
				engine.WithHost("localhost"),
				engine.WithDatabase("testdb"),
				engine.WithUsername("postgres"),
				engine.WithPassword("password"),
				engine.WithPgSslmode("disable"),
			},
			wantErr: false,
		},
		{
			name: "Missing Username",
			options: []engine.Option{
				engine.WithHost("localhost"),
				engine.WithDatabase("testdb"),
				engine.WithPassword("password"),
			},
			wantErr: true,
			errMsg:  "Username is required for pgsql driver",
		},
		{
			name: "engine.engine.With MySQL engine.Option",
			options: []engine.Option{
				engine.WithHost("localhost"),
				engine.WithDatabase("testdb"),
				engine.WithUsername("postgres"),
				engine.WithPassword("password"),
				engine.WithMySQLCollation("utf8mb4_unicode_ci"),
			},
			wantErr: true,
			errMsg:  "engine.WithMySQLCollation is only valid for mysql driver",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			defer func() {
				if r := recover(); r != nil {
					if !tt.wantErr {
						t.Errorf("engine.NewDBConfig() panicked unexpectedly: %v", r)
					} else if tt.errMsg != "" && r != tt.errMsg {
						t.Errorf("engine.NewDBConfig() panic = %v, want %v", r, tt.errMsg)
					}
				} else if tt.wantErr {
					t.Errorf("engine.NewDBConfig() did not panic, expected panic with: %v", tt.errMsg)
				}
			}()

			config := engine.NewDBConfig("pgsql", tt.options...)
			if !tt.wantErr && (config.Driver != "pgsql" || config.PostgreSQL.Sslmode != "disable") {
				t.Errorf("PostgreSQL config not set correctly: %+v", config)
			}
		})
	}
}

// TestSQLiteConfig 测试 SQLite 驱动的配置
func TestSQLiteConfig(t *testing.T) {
	tests := []struct {
		name    string
		options []engine.Option
		wantErr bool
		errMsg  string
	}{
		{
			name: "Valid Config",
			options: []engine.Option{
				engine.WithSQLiteFile("test.db"),
				engine.WithSQLiteJournal("WAL"),
			},
			wantErr: false,
		},
		{
			name:    "Missing File",
			options: []engine.Option{},
			wantErr: true,
			errMsg:  "File is required for sqlite3 driver",
		},
		{
			name: "engine.engine.With PostgreSQL engine.Option",
			options: []engine.Option{
				engine.WithSQLiteFile("test.db"),
				engine.WithPgSslmode("disable"),
			},
			wantErr: true,
			errMsg:  "engine.WithPgSslmode is only valid for pgsql driver",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			defer func() {
				if r := recover(); r != nil {
					if !tt.wantErr {
						t.Errorf("engine.NewDBConfig() panicked unexpectedly: %v", r)
					} else if tt.errMsg != "" && r != tt.errMsg {
						t.Errorf("engine.NewDBConfig() panic = %v, want %v", r, tt.errMsg)
					}
				} else if tt.wantErr {
					t.Errorf("engine.NewDBConfig() did not panic, expected panic with: %v", tt.errMsg)
				}
			}()

			config := engine.NewDBConfig("sqlite3", tt.options...)
			if !tt.wantErr && (config.Driver != "sqlite3" || config.SQLite.File != "test.db") {
				t.Errorf("SQLite config not set correctly: %+v", config)
			}
		})
	}
}

// TestSQLServerConfig 测试 SQL Server 驱动的配置
func TestSQLServerConfig(t *testing.T) {
	tests := []struct {
		name    string
		options []engine.Option
		wantErr bool
		errMsg  string
	}{
		{
			name: "Valid Config",
			options: []engine.Option{
				engine.WithHost("sqlserver.example.com"),
				engine.WithDatabase("master"),
				engine.WithUsername("sa"),
				engine.WithPassword("password"),
				engine.WithSQLServerInstance("SQLEXPRESS"),
			},
			wantErr: false,
		},
		{
			name: "Missing Password",
			options: []engine.Option{
				engine.WithHost("sqlserver.example.com"),
				engine.WithDatabase("master"),
				engine.WithUsername("sa"),
			},
			wantErr: true,
			errMsg:  "Password is required for sqlserver driver",
		},
		{
			name: "engine.engine.With SQLite engine.Option",
			options: []engine.Option{
				engine.WithHost("sqlserver.example.com"),
				engine.WithDatabase("master"),
				engine.WithUsername("sa"),
				engine.WithPassword("password"),
				engine.WithSQLiteFile("test.db"),
			},
			wantErr: true,
			errMsg:  "engine.WithSQLiteFile is only valid for sqlite3 driver",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			defer func() {
				if r := recover(); r != nil {
					if !tt.wantErr {
						t.Errorf("engine.NewDBConfig() panicked unexpectedly: %v", r)
					} else if tt.errMsg != "" && r != tt.errMsg {
						t.Errorf("engine.NewDBConfig() panic = %v, want %v", r, tt.errMsg)
					}
				} else if tt.wantErr {
					t.Errorf("engine.NewDBConfig() did not panic, expected panic with: %v", tt.errMsg)
				}
			}()

			config := engine.NewDBConfig("sqlserver", tt.options...)
			if !tt.wantErr && (config.Driver != "sqlserver" || config.SQLServer.Instance != "SQLEXPRESS") {
				t.Errorf("SQL Server config not set correctly: %+v", config)
			}
		})
	}
}

// TestInvalidDriver 测试不支持的驱动
func TestInvalidDriver(t *testing.T) {
	defer func() {
		if r := recover(); r != nil {
			if r != "Unsupported driver: oracle" {
				t.Errorf("engine.NewDBConfig() panic = %v, want 'Unsupported driver: oracle'", r)
			}
		} else {
			t.Errorf("engine.NewDBConfig() did not panic for invalid driver")
		}
	}()

	engine.NewDBConfig("oracle")
}

// TestDefaultValues 测试默认值
func TestDefaultValues(t *testing.T) {
	config := engine.NewDBConfig("mysql",
		engine.WithHost("localhost"),
		engine.WithDatabase("testdb"),
		engine.WithUsername("root"),
		engine.WithPassword("password"),
	)

	if config.Charset != "utf8mb4" {
		t.Errorf("Default Charset = %v, want utf8mb4", config.Charset)
	}
	if config.ConnMaxLifetime != 2*time.Hour {
		t.Errorf("Default ConnMaxLifetime = %v, want 2h", config.ConnMaxLifetime)
	}
	if config.MaxOpenConns != 100 {
		t.Errorf("Default MaxOpenConns = %v, want 100", config.MaxOpenConns)
	}
}

func TestToDSN(t *testing.T) {
	tests := []struct {
		name    string
		config  engine.DBConfig
		wantDSN string
		wantErr bool
		errMsg  string
	}{
		{
			name: "MySQL DSN",
			config: engine.NewDBConfig("mysql",
				engine.WithHost("localhost"),
				engine.WithPort("3306"),
				engine.WithDatabase("testdb"),
				engine.WithUsername("root"),
				engine.WithPassword("password"),
				engine.WithMySQLCollation("utf8mb4_unicode_ci"),
			),
			wantDSN: "root:password@tcp(localhost:3306)/testdb?charset=utf8mb4&collation=utf8mb4_unicode_ci",
			wantErr: false,
		},
		{
			name: "PostgreSQL DSN",
			config: engine.NewDBConfig("pgsql",
				engine.WithHost("localhost"),
				engine.WithPort("5432"),
				engine.WithDatabase("testdb"),
				engine.WithUsername("postgres"),
				engine.WithPassword("password"),
				engine.WithPgSslmode("disable"),
			),
			wantDSN: "host=localhost port=5432 user=postgres password=password dbname=testdb sslmode=disable",
			wantErr: false,
		},
		{
			name: "SQLite DSN",
			config: engine.NewDBConfig("sqlite3",
				engine.WithSQLiteFile("test.db"),
				engine.WithSQLiteJournal("WAL"),
			),
			wantDSN: "test.db?_journal=WAL",
			wantErr: false,
		},
		{
			name: "SQL Server DSN",
			config: engine.NewDBConfig("sqlserver",
				engine.WithHost("sqlserver.example.com"),
				engine.WithPort("1433"),
				engine.WithDatabase("master"),
				engine.WithUsername("sa"),
				engine.WithPassword("password"),
				engine.WithSQLServerInstance("SQLEXPRESS"),
			),
			wantDSN: "sqlserver://sa:password@sqlserver.example.com\\SQLEXPRESS:1433?server=sqlserver.example.com\\SQLEXPRESS&database=master",
			wantErr: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			defer func() {
				if r := recover(); r != nil {
					if !tt.wantErr {
						t.Errorf("ToDSN() panicked unexpectedly: %v", r)
					} else if tt.errMsg != "" && r != tt.errMsg {
						t.Errorf("ToDSN() panic = %v, want %v", r, tt.errMsg)
					}
				} else if tt.wantErr {
					t.Errorf("ToDSN() did not panic, expected panic with: %v", tt.errMsg)
				}
			}()

			dsn := tt.config.ToDSN()
			if !tt.wantErr && dsn != tt.wantDSN {
				t.Errorf("ToDSN() = %v, want %v", dsn, tt.wantDSN)
			}
		})
	}
}