//
//  InsightsExporter.swift
//  Reflect
//
//  Debug utility to export insights view screenshots with sample AI data.
//

import SwiftUI
import UIKit
import os.log

/// Exports insights view screenshots for App Store marketing
@MainActor
class InsightsExporter {

    // MARK: - Screen Sizes (iPhone 15 Pro Max @ 3x)

    /// Full screen size for insights export
    static let screenSize = CGSize(width: 430, height: 932)

    // MARK: - Export All Insights Screenshots

    /// Exports insights screenshots in light and dark mode
    /// - Returns: URL to the export directory, or nil if failed
    static func exportInsightsScreenshots() async -> URL? {
        let documentsPath = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let exportPath = documentsPath.appendingPathComponent("InsightsExports", isDirectory: true)

        // Clean and create export directory
        try? FileManager.default.removeItem(at: exportPath)
        do {
            try FileManager.default.createDirectory(at: exportPath, withIntermediateDirectories: true)
        } catch {
            AppLogger.export.error("Failed to create insights export directory: \(error)")
            return nil
        }

        var totalExported = 0

        // Export with default tint and emoji pack
        let moodTint: MoodTints = .Default
        let imagePack: MoodImages = .Emoji

        // Export light mode
        await exportInsightsView(
            colorScheme: .light,
            moodTint: moodTint,
            imagePack: imagePack,
            to: exportPath,
            name: "insights_light"
        )
        totalExported += 1

        // Export dark mode
        await exportInsightsView(
            colorScheme: .dark,
            moodTint: moodTint,
            imagePack: imagePack,
            to: exportPath,
            name: "insights_dark"
        )
        totalExported += 1

        print("✨ Total \(totalExported) insights screenshots exported to: \(exportPath.path)")
        return exportPath
    }

    // MARK: - Export Single Screenshot

    private static func exportInsightsView(
        colorScheme: ColorScheme,
        moodTint: MoodTints,
        imagePack: MoodImages,
        to folder: URL,
        name: String
    ) async {
        let content = ExportableInsightsView(
            colorScheme: colorScheme,
            moodTint: moodTint,
            imagePack: imagePack
        )

        let view = ExportableInsightsContainer(
            width: screenSize.width,
            height: screenSize.height,
            colorScheme: colorScheme
        ) {
            content
        }

        await renderAndSave(view: view, to: folder, name: name)
    }

    // MARK: - Render and Save

    private static func renderAndSave<V: View>(view: V, to folder: URL, name: String) async {
        let renderer = ImageRenderer(content: view.frame(width: screenSize.width, height: screenSize.height))
        renderer.scale = 3.0 // 3x for high res

        if let image = renderer.uiImage {
            let url = folder.appendingPathComponent("\(name).png")
            if let data = image.pngData() {
                do {
                    try data.write(to: url)
                } catch {
                    AppLogger.export.error("Failed to write insights image '\(name)': \(error)")
                }
            }
        }
    }
}