// Copyright 2016 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package unittest

import (
	"context"
	"fmt"
	"math"
	"os"
	"strings"

	"code.gitea.io/gitea/models/db"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"xorm.io/builder"
)

// Code in this file is mainly used by unittest.CheckConsistencyFor, which is not in the unit test for various reasons.
// In the future if we can decouple CheckConsistencyFor into separate unit test code, then this file can be moved into unittest package too.

// NonexistentID an ID that will never exist
const NonexistentID = int64(math.MaxInt64)

type TestingT interface {
	require.TestingT
	assert.TestingT
	Context() context.Context
}

type testCond struct {
	query any
	args  []any
}

type testOrderBy string

// Cond create a condition with arguments for a test
func Cond(query any, args ...any) any {
	return &testCond{query: query, args: args}
}

// OrderBy creates "ORDER BY" a test query
func OrderBy(orderBy string) any {
	return testOrderBy(orderBy)
}

func whereOrderConditions(e db.Engine, conditions []any) db.Engine {
	orderBy := "id" // query must have the "ORDER BY", otherwise the result is not deterministic
	for _, condition := range conditions {
		switch cond := condition.(type) {
		case *testCond:
			e = e.Where(cond.query, cond.args...)
		case testOrderBy:
			orderBy = string(cond)
		default:
			e = e.Where(cond)
		}
	}
	return e.OrderBy(orderBy)
}

func getBeanIfExists(t TestingT, bean any, conditions ...any) (bool, error) {
	e := db.GetEngine(t.Context())
	return whereOrderConditions(e, conditions).Get(bean)
}

func GetBean[T any](t TestingT, bean T, conditions ...any) (ret T) {
	exists, err := getBeanIfExists(t, bean, conditions...)
	require.NoError(t, err)
	if exists {
		return bean
	}
	return ret
}

// AssertExistsAndLoadBean assert that a bean exists and load it from the test database
func AssertExistsAndLoadBean[T any](t TestingT, bean T, conditions ...any) T {
	exists, err := getBeanIfExists(t, bean, conditions...)
	require.NoError(t, err)
	require.True(t, exists,
		"Expected to find %+v (of type %T, with conditions %+v), but did not",
		bean, bean, conditions)
	return bean
}

// AssertExistsAndLoadMap assert that a row exists and load it from the test database
func AssertExistsAndLoadMap(t TestingT, table string, conditions ...any) map[string]string {
	e := db.GetEngine(t.Context()).Table(table)
	res, err := whereOrderConditions(e, conditions).Query()
	assert.NoError(t, err)
	assert.Len(t, res, 1,
		"Expected to find one row in %s (with conditions %+v), but found %d",
		table, conditions, len(res),
	)

	if len(res) == 1 {
		rec := map[string]string{}
		for k, v := range res[0] {
			rec[k] = string(v)
		}
		return rec
	}
	return nil
}

// GetCount get the count of a bean
func GetCount(t TestingT, bean any, conditions ...any) int {
	e := db.GetEngine(t.Context())
	for _, condition := range conditions {
		switch cond := condition.(type) {
		case *testCond:
			e = e.Where(cond.query, cond.args...)
		default:
			e = e.Where(cond)
		}
	}
	count, err := e.Count(bean)
	assert.NoError(t, err)
	return int(count)
}

// AssertNotExistsBean assert that a bean does not exist in the test database
func AssertNotExistsBean(t TestingT, bean any, conditions ...any) {
	exists, err := getBeanIfExists(t, bean, conditions...)
	assert.NoError(t, err)
	assert.False(t, exists)
}

// AssertCount assert the count of a bean
func AssertCount(t TestingT, bean, expected any) bool {
	return assert.EqualValues(t, expected, GetCount(t, bean))
}

// AssertInt64InRange assert value is in range [low, high]
func AssertInt64InRange(t assert.TestingT, low, high, value int64) {
	assert.True(t, value >= low && value <= high,
		"Expected value in range [%d, %d], found %d", low, high, value)
}

// GetCountByCond get the count of database entries matching bean
func GetCountByCond(t TestingT, tableName string, cond builder.Cond) int64 {
	e := db.GetEngine(t.Context())
	count, err := e.Table(tableName).Where(cond).Count()
	assert.NoError(t, err)
	return count
}

// AssertCountByCond test the count of database entries matching bean
func AssertCountByCond(t TestingT, tableName string, cond builder.Cond, expected int) bool {
	return assert.EqualValues(t, expected, GetCountByCond(t, tableName, cond),
		"Failed consistency test, the counted bean (of table %s) was %+v", tableName, cond)
}

// DumpQueryResult dumps the result of a query for debugging purpose
func DumpQueryResult(t require.TestingT, sqlOrBean any, sqlArgs ...any) {
	x := GetXORMEngine()
	goDB := x.DB().DB
	sql, ok := sqlOrBean.(string)
	if !ok {
		sql = "SELECT * FROM " + x.TableName(sqlOrBean)
	} else if !strings.Contains(sql, " ") {
		sql = "SELECT * FROM " + sql
	}
	rows, err := goDB.Query(sql, sqlArgs...)
	require.NoError(t, err)
	defer rows.Close()
	columns, err := rows.Columns()
	require.NoError(t, err)

	_, _ = fmt.Fprintf(os.Stdout, "====== DumpQueryResult: %s ======\n", sql)
	idx := 0
	for rows.Next() {
		row := make([]any, len(columns))
		rowPointers := make([]any, len(columns))
		for i := range row {
			rowPointers[i] = &row[i]
		}
		require.NoError(t, rows.Scan(rowPointers...))
		_, _ = fmt.Fprintf(os.Stdout, "- # row[%d]\n", idx)
		for i, col := range columns {
			_, _ = fmt.Fprintf(os.Stdout, "  %s: %v\n", col, row[i])
		}
		idx++
	}
	if idx == 0 {
		_, _ = fmt.Fprintf(os.Stdout, "(no result, columns: %s)\n", strings.Join(columns, ", "))
	}
}
