package mysql_test

import (
	"database/sql"
	"fmt"
	"git.warky.dev/wdevs/relspecgo/pkg/models"
	driver "github.com/go-sql-driver/mysql"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"git.warky.dev/wdevs/relspecgo/pkg/readers"
	rmysql "git.warky.dev/wdevs/relspecgo/pkg/readers/mysql"
	"git.warky.dev/wdevs/relspecgo/pkg/writers"
	wmysql "git.warky.dev/wdevs/relspecgo/pkg/writers/mysql"
)

func TestLiveUnsupportedObjectsDiagnosed(t *testing.T) {
	conn := os.Getenv("RELSPEC_TEST_MYSQL_CONN")
	if conn == "" {
		t.Skip("RELSPEC_TEST_MYSQL_CONN is not set")
	}
	db, err := sql.Open("mysql", conn)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { db.Close() })
	prefix := fmt.Sprintf("unsupported_%d", time.Now().UnixNano())
	table, view, trigger := prefix+"_table", prefix+"_view", prefix+"_trigger"
	t.Cleanup(func() {
		for _, stmt := range []string{"DROP VIEW IF EXISTS " + view, "DROP TRIGGER IF EXISTS " + trigger, "DROP TABLE IF EXISTS " + table} {
			if _, err := db.Exec(stmt); err != nil {
				t.Error(err)
			}
		}
	})
	for _, stmt := range []string{
		"CREATE TABLE " + table + " (id INT PRIMARY KEY) PARTITION BY HASH(id) PARTITIONS 2",
		"CREATE VIEW " + view + " AS SELECT id FROM " + table,
		"CREATE TRIGGER " + trigger + " BEFORE INSERT ON " + table + " FOR EACH ROW SET NEW.id = NEW.id + 1",
	} {
		if _, err := db.Exec(stmt); err != nil {
			t.Fatalf("%s: %v", stmt, err)
		}
	}
	model, err := rmysql.NewReader(&readers.ReaderOptions{ConnectionString: conn}).ReadDatabase()
	if err != nil {
		t.Fatal(err)
	}
	path := filepath.Join(t.TempDir(), "schema.sql")
	if err := os.WriteFile(path, []byte("original"), 0600); err != nil {
		t.Fatal(err)
	}
	err = wmysql.NewWriter(&writers.WriterOptions{StrictConversion: true, OutputPath: path}).WriteDatabase(model)
	for _, want := range []string{"partitioned table", view, trigger} {
		if err == nil || !strings.Contains(err.Error(), want) {
			t.Errorf("missing diagnostic %s: %v", want, err)
		}
	}
	bytes, readErr := os.ReadFile(path)
	if readErr != nil || string(bytes) != "original" {
		t.Fatalf("strict failure touched file: %s %v", bytes, readErr)
	}
	// Schema-filtered/library writes retain discovery diagnostics as well.
	err = wmysql.NewWriter(&writers.WriterOptions{StrictConversion: true}).WriteSchema(model.Schemas[0])
	if err == nil || !strings.Contains(err.Error(), trigger) {
		t.Fatalf("filtered schema lost diagnostics: %v", err)
	}
	var warnings []string
	_, err = wmysql.NewWriter(&writers.WriterOptions{Warning: func(s string) { warnings = append(warnings, s) }}).Statements(model)
	if err != nil {
		t.Fatal(err)
	}
	for _, want := range []string{view, trigger, table} {
		found := false
		for _, warning := range warnings {
			if strings.Contains(warning, want) {
				found = true
			}
		}
		if !found {
			t.Errorf("no warning for %s: %v", want, warnings)
		}
	}
}

func TestLiveUnsupportedSQLModeFailsBeforeDDL(t *testing.T) {
	conn := os.Getenv("RELSPEC_TEST_MYSQL_CONN")
	if conn == "" {
		t.Skip("RELSPEC_TEST_MYSQL_CONN is not set")
	}
	for _, mode := range []string{"NO_BACKSLASH_ESCAPES", "ANSI_QUOTES"} {
		t.Run(mode, func(t *testing.T) {
			cfg, err := driver.ParseDSN(conn)
			if err != nil {
				t.Fatal(err)
			}
			if cfg.Params == nil {
				cfg.Params = map[string]string{}
			}
			cfg.Params["sql_mode"] = "'" + mode + "'"
			modeConn := cfg.FormatDSN()
			model, err := rmysql.NewReader(&readers.ReaderOptions{ConnectionString: modeConn}).ReadDatabase()
			if err != nil {
				t.Fatal(err)
			}
			if _, err := wmysql.NewWriter(&writers.WriterOptions{StrictConversion: true}).Statements(model); err == nil || !strings.Contains(err.Error(), mode) {
				t.Fatalf("source mode not diagnosed: %v", err)
			}
			db, err := sql.Open("mysql", conn)
			if err != nil {
				t.Fatal(err)
			}
			defer db.Close()
			name := fmt.Sprintf("mode_%d", time.Now().UnixNano())
			defer db.Exec("DROP TABLE IF EXISTS " + name)
			target := models.InitDatabase(cfg.DBName)
			s := models.InitSchema(cfg.DBName)
			target.Schemas = append(target.Schemas, s)
			table := models.InitTable(name, s.Name)
			s.Tables = append(s.Tables, table)
			c := models.InitColumn("id", name, s.Name)
			c.Type = "int"
			table.Columns[c.Name] = c
			err = wmysql.NewWriter(&writers.WriterOptions{StrictConversion: true, Metadata: map[string]any{"connection_string": modeConn}}).WriteDatabase(target)
			if err == nil || !strings.Contains(err.Error(), mode) {
				t.Fatalf("target mode not rejected: %v", err)
			}
			var count int
			if err := db.QueryRow("SELECT COUNT(*) FROM information_schema.TABLES WHERE TABLE_SCHEMA=? AND TABLE_NAME=?", cfg.DBName, name).Scan(&count); err != nil {
				t.Fatal(err)
			}
			if count != 0 {
				t.Fatal("mode rejection occurred after DDL")
			}
		})
	}
}