import { DesignData, WidgetData } from './types';
import {
    getVariableName,
    generateVariableNames,
    getWidgetTypeForGeneration,
    indentText,
} from './utils';
import {
    getWidgetParameters,
    getPlaceParameters,
    generateWidgetContent,
} from './widgetHelpers';
import { generateEventHandlers, getWidgetEventBindings } from './eventHelpers';

export class CodeGenerator {
    private indentLevel = 0;
    private designData: DesignData | null = null;

    public generateTkinterCode(designData: DesignData): string {
        this.designData = designData;
        const className = designData.form.className || 'Application';
        console.log(
            '[Generator] Start, widgets:',
            designData.widgets.length,
            'events:',
            designData.events?.length || 0
        );
        const lines: string[] = [];
        const nameMap = generateVariableNames(designData.widgets);

        lines.push('import tkinter as tk');
        lines.push('from tkinter import ttk');
        lines.push('');

        lines.push(`class ${className}:`);
        this.indentLevel = 1;

        lines.push(this.indent('def __init__(self):'));
        this.indentLevel = 2;
        lines.push(this.indent('self.root = tk.Tk()'));
        lines.push(this.indent(`self.root.title("${designData.form.title}")`));
        lines.push(
            this.indent(
                `self.root.geometry("${designData.form.size.width}x${designData.form.size.height}")`
            )
        );
        lines.push(this.indent('self.create_widgets()'));
        lines.push('');

        this.indentLevel = 1;
        lines.push(this.indent('def create_widgets(self):'));
        this.indentLevel = 2;

        designData.widgets.forEach((widget) => {
            console.log('[Generator] Widget:', widget.id, widget.type);
            lines.push(...this.generateWidgetCode(widget, nameMap));
        });

        this.indentLevel = 1;
        lines.push(this.indent('def run(self):'));
        this.indentLevel = 2;
        lines.push(this.indent('self.root.mainloop()'));
        lines.push('');

        const hasEvents = designData.events && designData.events.length > 0;

        if (hasEvents) {
            console.log('[Generator] Generating event handlers');
            lines.push(
                ...generateEventHandlers(
                    designData,
                    (text) => indentText(1, text),
                    (text) => indentText(2, text)
                )
            );
        }

        this.indentLevel = 0;
        lines.push('if __name__ == "__main__":');
        this.indentLevel = 1;
        lines.push(this.indent('try:'));
        this.indentLevel = 2;
        lines.push(this.indent(`app = ${className}()`));
        lines.push(this.indent('app.run()'));
        this.indentLevel = 1;
        lines.push(this.indent('except Exception as e:'));
        this.indentLevel = 2;
        lines.push(this.indent('import traceback'));
        lines.push(this.indent('traceback.print_exc()'));
        lines.push(this.indent('input("Press Enter to exit...")'));

        return lines.join('\n');
    }

    public generateCreateWidgetsBody(designData: DesignData): string {
        this.designData = designData;
        const lines: string[] = [];
        const nameMap = generateVariableNames(designData.widgets);
        this.indentLevel = 2; // Inside class -> inside create_widgets

        designData.widgets.forEach((widget) => {
            lines.push(...this.generateWidgetCode(widget, nameMap));
        });

        return lines.join('\n');
    }

    public generateEventHandler(event: any): string {
        // Simple helper to generate a single event handler method
        // Used when injecting new methods
        const lines: string[] = [];
        // Use existing signature if available (to preserve user arguments)
        // Note: signature does not include 'def ' prefix in our current extraction logic?
        // Let's check base.py: sig_raw = self.source_code[def_start_idx : start_idx].strip()
        // It includes 'def name(...)'.
        // So we just use it directly.

        if (event.signature) {
            lines.push(`    ${event.signature}:`);
        } else {
            lines.push(`    def ${event.name}(self, event=None):`);
        }

        if (event.code) {
            const codeContent =
                typeof event.code === 'string'
                    ? event.code
                    : String(event.code || '');
            const body = codeContent
                .split('\n')
                .map((l: string) => '        ' + l)
                .join('\n');
            lines.push(body);
        } else {
            lines.push('        pass');
        }
        return lines.join('\n');
    }

    private generateWidgetCode(
        widget: WidgetData,
        nameMap: Map<string, string>
    ): string[] {
        const lines: string[] = [];
        const varName = getVariableName(widget, nameMap);

        const widgetType = getWidgetTypeForGeneration(widget.type);
        lines.push(
            this.indent(
                `self.${varName} = ${widgetType}(self.root${getWidgetParameters(widget)})`
            )
        );

        const placeParams = getPlaceParameters(widget);
        lines.push(this.indent(`self.${varName}.place(${placeParams})`));

        const contentLines = generateWidgetContent(widget, varName);
        if (contentLines.length > 0) {
            contentLines.forEach((l) => lines.push(this.indent(l)));
        }

        lines.push(
            ...getWidgetEventBindings(
                this.designData,
                widget,
                varName,
                (text) => this.indent(text)
            )
        );

        return lines;
    }

    private indent(text: string): string {
        return indentText(this.indentLevel, text);
    }
}