//
//  ProviderID.swift
//  Zyquo Agent
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//
//  Ported verbatim from Zyquo Cloud — same providers, same base URLs, same
//  wire formats. See docs/PROVIDER-REUSE.md.
//

import Foundation

/// The 12 built-in cloud AI providers, plus user-defined custom endpoints.
enum ProviderID: String, Codable, CaseIterable, Identifiable, Hashable {
    case openai
    case anthropic
    case xai
    case mistral
    case gemini
    case qwen
    case deepseek
    case kimi
    case perplexity
    case together
    case deepinfra
    case cerebras
    case custom

    var id: String { rawValue }

    /// User-facing display name.
    var displayName: String {
        switch self {
        case .openai: return "OpenAI"
        case .anthropic: return "Anthropic"
        case .xai: return "xAI"
        case .mistral: return "Mistral"
        case .gemini: return "Google Gemini"
        case .qwen: return "Alibaba Qwen"
        case .deepseek: return "DeepSeek"
        case .kimi: return "Kimi"
        case .perplexity: return "Perplexity"
        case .together: return "Together AI"
        case .deepinfra: return "DeepInfra"
        case .cerebras: return "Cerebras"
        case .custom: return "Custom"
        }
    }

    /// Wire protocol used by this provider's chat endpoint.
    var wireFormat: WireFormat {
        switch self {
        case .anthropic: return .anthropicMessages
        default: return .openAIChatCompletions
        }
    }

    /// Base URL of the provider's API (chat + models live under this root).
    /// `custom` has no fixed base URL — it comes from the user's endpoint config.
    var defaultBaseURL: URL? {
        switch self {
        case .openai: return URL(string: "https://api.openai.com/v1")
        case .anthropic: return URL(string: "https://api.anthropic.com/v1")
        case .xai: return URL(string: "https://api.x.ai/v1")
        case .mistral: return URL(string: "https://api.mistral.ai/v1")
        case .gemini: return URL(string: "https://generativelanguage.googleapis.com/v1beta/openai")
        case .qwen: return URL(string: "https://dashscope-intl.aliyuncs.com/compatible-mode/v1")
        case .deepseek: return URL(string: "https://api.deepseek.com")
        case .kimi: return URL(string: "https://api.moonshot.ai/v1")
        case .perplexity: return URL(string: "https://api.perplexity.ai")
        case .together: return URL(string: "https://api.together.xyz/v1")
        case .deepinfra: return URL(string: "https://api.deepinfra.com/v1/openai")
        case .cerebras: return URL(string: "https://api.cerebras.ai/v1")
        case .custom: return nil
        }
    }

    /// Whether the provider exposes a `/models` listing endpoint usable for dynamic refresh.
    var supportsModelListing: Bool {
        self != .perplexity
    }

    /// Providers shown in Settings (custom endpoints are managed separately).
    static var builtIn: [ProviderID] {
        allCases.filter { $0 != .custom }
    }
}

/// The request/response schema a provider speaks.
enum WireFormat: String, Codable {
    /// OpenAI `/chat/completions` schema (used by 11 of the 12 built-in providers).
    case openAIChatCompletions
    /// Anthropic `/v1/messages` schema.
    case anthropicMessages
}