using Microsoft.Data.Sqlite;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Windows;

namespace Elwig.Services {
    public static class InteractionService {

        public static Func<string, string, string, string?>? Override;
        public static Action<string, string>? NextInformation;
        public static Action<string, string>? NextWarning;
        public static Action<string, string>? NextError;
        public static Func<string, string, bool>? NextContinue;
        public static Func<string, string, bool>? NextConfirmation;
        public static Func<string, string, bool>? NextQuestion;
        public static Func<string, string, string?>? NextSave;

        public static readonly Dictionary<string, string> ExtensionFilters = new() {
            ["pdf"] = "PDF-Datei (*.pdf)|*.pdf",
            ["ods"] = "OpenDocument Format Spreadsheet (*.ods)|*.ods",
            ["vcf"] = "vCard-Datei (*.vcf)|*.vcf",
            ["xml"] = "EBICS-Datei (*.xml)|*.xml",
            ["csv"] = "CSV-Datei (*.csv)|*.csv",
            ["sql.zip"] = "Komprimierte SQL-Datei (*.sql.zip)|*.sql.zip",
            ["elwig.zip"] = "Elwig-Export-Datei (*.elwig.zip)|*.elwig.zip",
        };

        public static void ShowInformation(string title, string text) {
            if (NextInformation != null) {
                NextInformation(title, text);
                NextInformation = null;
            } else if (Override != null) {
                Override("information", title, text);
            } else {
                MessageBox.Show(text, title, MessageBoxButton.OK, MessageBoxImage.Information);
            }
        }

        public static bool AskContinue(string title, string text) {
            if (NextContinue != null) {
                var r = NextContinue(title, text);
                NextContinue = null;
                return r;
            } else if (Override != null) {
                return Override("continue", title, text) != null;
            } else {
                return MessageBox.Show(text, title, MessageBoxButton.OKCancel, MessageBoxImage.Warning, MessageBoxResult.Cancel) == MessageBoxResult.OK;
            }
        }

        public static bool? AskContinueYesNo(string title, string text) {
            if (NextContinue != null) {
                var r = NextContinue(title, text);
                NextContinue = null;
                return r;
            } else if (Override != null) {
                return Override("continue", title, text) != null;
            } else {
                var r = MessageBox.Show(text, title, MessageBoxButton.YesNoCancel, MessageBoxImage.Warning, MessageBoxResult.Cancel);
                return r == MessageBoxResult.Yes ? true : r == MessageBoxResult.No ? false : null;
            }
        }

        public static bool AskConfirmation(string title, string text) {
            if (NextConfirmation != null) {
                var r = NextConfirmation(title, text);
                NextConfirmation = null;
                return r;
            } else if (Override != null) {
                return Override("confirm", title, text) != null;
            } else {
                return MessageBox.Show(text, title, MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No) == MessageBoxResult.Yes;
            }
        }

        public static bool AskQuestion(string title, string text, bool defaultResult) {
            if (NextQuestion != null) {
                var r = NextQuestion(title, text);
                NextQuestion = null;
                return r;
            } else if (Override != null) {
                return Override("question", title, text) != null;
            } else {
                return MessageBox.Show(text, title, MessageBoxButton.YesNo, MessageBoxImage.Question, defaultResult ? MessageBoxResult.Yes : MessageBoxResult.No) == MessageBoxResult.Yes;
            }
        }

        public static void ShowWarning(string title, string text) {
            if (NextWarning != null) {
                NextWarning(title, text);
                NextWarning = null;
            } else if (Override != null) {
                Override("warning", title, text);
            } else {
                MessageBox.Show(text, title, MessageBoxButton.OK, MessageBoxImage.Warning);
            }
        }

        public static void ShowError(string title, string text) {
            if (NextError != null) {
                NextError(title, text);
                NextError = null;
            } else if (Override != null) {
                Override("error", title, text);
            } else {
                MessageBox.Show(text, title, MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        public static void ShowException(Exception exc, bool showExcType = false, bool isError = true) {
            ShowException("Fehler", exc, showExcType, isError);
        }

        public static void ShowException(string title, Exception exc, bool showExcType = false, bool isError = true) {
            ShowException(title, null, exc, showExcType, isError);
        }

        public static void ShowException(string title, string? text, Exception exc, bool showExcType = false, bool isError = true) {
            text = text == null ? "" : text + (text.EndsWith('.') || text.EndsWith('!') || text.EndsWith('?') ? "" : ":") + "\n\n";
            if ((exc.InnerException ?? exc) is SqliteException sql) {
                if (sql.SqliteErrorCode == 5 || sql.SqliteErrorCode == 6) {
                    // SQLITE_BUSY / SQLITE_LOCKED
                    text += "Die Datenbank wurde gerade von einem anderen Gerät/Prozess verwendet. Bitte noch einmal versuchen!\n\n" + sql.Message;
                } else if (sql.SqliteErrorCode == 19) {
                    // SQLITE_CONSTRAINT
                    switch (sql.SqliteExtendedErrorCode) {
                        case 1555:  // SQLITE_CONSTRAINT_PRIMARYKEY - indicating that a PRIMARY KEY constraint failed
                        case 2067:  // SQLITE_CONSTRAINT_UNIQUE - indicating that a UNIQUE constraint failed
                        case 2579:  // SQLITE_CONSTRAINT_ROWID - indicating that a rowid is not unique
                            text += "Dieser Datensatz existiert bereits!\n\n";
                            break;
                        case 787:   // SQLITE_CONSTRAINT_FOREIGNKEY - indicating that a foreign key constraint failed
                        case 1299:  // SQLITE_CONSTRAINT_NOTNULL - indicating that a NOT NULL constraint failed
                        case 275:   // SQLITE_CONSTRAINT_CHECK - indicating that a CHECK constraint failed
                        case 1811:  // SQLITE_CONSTRAINT_TRIGGER - indicating that a RAISE function within a trigger fired, causing the SQL statement to abort
                        case 531:   // SQLITE_CONSTRAINT_COMMITHOOK - indicating that a commit hook callback returned non-zero that thus caused the SQL statement to be rolled back
                            text += "Der Datensatz ist inkonsistent!\n\n";
                            break;
                    }
                    text += sql.Message;
                } else {
                    text += exc.Message + (showExcType ? $" ({exc.GetType().Name})" : "");
                    if (exc.InnerException != null) text += "\n\n" + exc.InnerException.Message;
                }
            } else {
                text += exc.Message + (showExcType ? $" ({exc.GetType().Name})" : "");
                if (exc.InnerException != null) text += "\n\n" + exc.InnerException.Message;
            }
            if (isError) {
                ShowError(title, text);
            } else {
                ShowWarning(title, text);
            }
        }

        public static void ShowDbException(string title, Exception exc) {
            ShowException(title, "Der Eintrag konnte nicht in der Datenbank aktualisiert werden!", exc);
        }

        public static bool AskException(string title, string? text, Exception exc) {
            text = text == null ? "" : text + (text.EndsWith('.') || text.EndsWith('!') || text.EndsWith('?') ? "" : ":") + "\n\n";
            text += exc.Message;
            if (exc.InnerException != null) text += "\n\n" + exc.InnerException.Message;
            if (Override != null) {
                return Override("error", title, text) != null;
            } else {
                return MessageBox.Show(text, title, MessageBoxButton.YesNo, MessageBoxImage.Error, MessageBoxResult.No) == MessageBoxResult.Yes;
            }
        }

        public static string? SaveFile(string title, string defaultFileName, string extension) {
            if (NextSave != null) {
                var r = NextSave(title, $"{defaultFileName}.{extension}");
                NextSave = null;
                return r;
            } else if (Override != null) {
                return Override("save", title, $"{defaultFileName}.{extension}");
            } else {
                var d = new SaveFileDialog() {
                    FileName = $"{defaultFileName}.{extension}",
                    DefaultExt = extension,
                    Filter = ExtensionFilters.GetValueOrDefault(extension, ""),
                    Title = $"{title} speichern unter - Elwig",
                    AddExtension = !extension.Contains('.'),
                };
                return d.ShowDialog() == true ? d.FileName : null;
            }
        }
    }
}