export class NotesStore extends EventTarget {
    constructor() {
        super();
        this.state = {
            notes: [],
            activeNote: null,
            unsavedChanges: new Map(), // noteName -> boolean
            noteContent: new Map(), // noteName -> string (current content)
            savedContent: new Map() // noteName -> string (last saved content)
        };
    }

    getState() {
        return { ...this.state };
    }

    setState(updates) {
        const prevState = { ...this.state };
        this.state = { ...this.state, ...updates };

        // Emit state change event
        this.dispatchEvent(new CustomEvent('stateChanged', {
            detail: {
                prevState,
                newState: this.getState(),
                updates
            }
        }));
    }

    // Convenience methods for common state operations
    setNotes(notes) {
        this.setState({ notes });
    }

    setActiveNote(activeNote) {
        this.setState({ activeNote });
    }

    setNoteContent(noteName, content) {
        const noteContent = new Map(this.state.noteContent);
        noteContent.set(noteName, content);
        this.setState({ noteContent });
    }

    setSavedContent(noteName, content) {
        const savedContent = new Map(this.state.savedContent);
        savedContent.set(noteName, content);
        this.setState({ savedContent });
    }

    setUnsavedChanges(noteName, hasChanges) {
        const unsavedChanges = new Map(this.state.unsavedChanges);
        unsavedChanges.set(noteName, hasChanges);
        this.setState({ unsavedChanges });
    }

    deleteNoteFromState(noteName) {
        const unsavedChanges = new Map(this.state.unsavedChanges);
        const noteContent = new Map(this.state.noteContent);
        const savedContent = new Map(this.state.savedContent);

        unsavedChanges.delete(noteName);
        noteContent.delete(noteName);
        savedContent.delete(noteName);

        this.setState({ unsavedChanges, noteContent, savedContent });
    }

    renameNoteInState(oldName, newName) {
        const unsavedChanges = new Map(this.state.unsavedChanges);
        const noteContent = new Map(this.state.noteContent);
        const savedContent = new Map(this.state.savedContent);

        // Transfer state from old name to new name
        const unsavedState = unsavedChanges.get(oldName) || false;
        const content = noteContent.get(oldName) || '';
        const saved = savedContent.get(oldName) || '';

        // Remove old
        unsavedChanges.delete(oldName);
        noteContent.delete(oldName);
        savedContent.delete(oldName);

        // Add new
        unsavedChanges.set(newName, unsavedState);
        noteContent.set(newName, content);
        savedContent.set(newName, saved);

        this.setState({ unsavedChanges, noteContent, savedContent });
    }
}