//
//  ClipperConfig.swift
//  划词侠 plugin
//
//  Loads ~/.config/codeisland/clipper-config.json on demand.
//  Schema:
//    { "deepseek_api_key": "sk-...",
//      "default_translate_target": "zh" }
//
//  Never bundles a key. If the file is missing/empty we surface a
//  state-E "请先填" screen with a helper that copies the path to the
//  clipboard so the user can `open -e` it.
//

import Foundation

struct ClipperConfig {
    var deepseekApiKey: String
    var defaultTranslateTarget: String  // "zh" | "en" | "ja"

    static let configPath: String = {
        let home = NSHomeDirectory()
        return "\(home)/.config/codeisland/clipper-config.json"
    }()

    static var configDir: String {
        let home = NSHomeDirectory()
        return "\(home)/.config/codeisland"
    }

    /// Best-effort load. If anything is missing we return nil so the UI
    /// can render the onboarding banner — never throws to the caller.
    static func load() -> ClipperConfig? {
        let url = URL(fileURLWithPath: configPath)
        guard let data = try? Data(contentsOf: url) else {
            ClipperDebugLog.write("config: file missing at \(configPath)")
            return nil
        }
        guard let obj = try? JSONSerialization.jsonObject(with: data) as? [String: Any] else {
            ClipperDebugLog.write("config: malformed JSON")
            return nil
        }
        let key = (obj["deepseek_api_key"] as? String) ?? ""
        let target = (obj["default_translate_target"] as? String) ?? "zh"
        if key.trimmingCharacters(in: .whitespaces).isEmpty
            || key.trimmingCharacters(in: .whitespaces) == "TODO" {
            ClipperDebugLog.write("config: deepseek_api_key empty/TODO")
            return nil
        }
        return ClipperConfig(deepseekApiKey: key, defaultTranslateTarget: target)
    }

    /// Write a stub file the user can edit. Idempotent — won't clobber
    /// an existing real config.
    @discardableResult
    static func ensureStubExists() -> Bool {
        let fm = FileManager.default
        if fm.fileExists(atPath: configPath) { return false }
        try? fm.createDirectory(atPath: configDir, withIntermediateDirectories: true)
        let stub = """
        {
          "deepseek_api_key": "TODO",
          "default_translate_target": "zh"
        }
        """
        do {
            try stub.write(toFile: configPath, atomically: true, encoding: .utf8)
            ClipperDebugLog.write("config: wrote stub at \(configPath)")
            return true
        } catch {
            ClipperDebugLog.write("config: stub write failed: \(error)")
            return false
        }
    }
}