module Web.Controller.Api.V2.Sdk where

-- GET /api/v2/sdk          — SDK index page
-- GET /api/v2/sdk/ihf-client.ts  — TypeScript SDK (live-generated from registries)
-- GET /api/v2/sdk/ihf-client.py  — Python SDK (live-generated from registries)

import Web.Types
import Generated.Types
import IHP.Prelude
import IHP.ControllerPrelude
import qualified Data.Text as T
import qualified Data.Text.Encoding as TE
import qualified Data.ByteString.Lazy as LBS
import Network.HTTP.Types (status200)
import Network.Wai (responseLBS)
import Application.Helper.TypeRegistry
    ( activeWidgetTypes, activeEventTypes, activeAnnotationCategories )

instance Controller ApiV2SdkController where

    action ApiV2SdkIndexAction = do
        respondAndExit $ responseLBS status200
            [("Content-Type", "text/html; charset=utf-8")]
            sdkIndexHtml

    action ApiV2SdkTsAction = do
        (fwWt, ownedWt) <- activeWidgetTypes
        let allWt = fwWt ++ ownedWt
        ets  <- activeEventTypes
        acs  <- activeAnnotationCategories
        let src = generateTsSdk allWt ets acs
        respondAndExit $ responseLBS status200
            [ ("Content-Type", "application/typescript; charset=utf-8")
            , ("Content-Disposition", "inline; filename=\"ihf-client.ts\"")
            ]
            (LBS.fromStrict (TE.encodeUtf8 src))

    action ApiV2SdkPyAction = do
        (fwWt, ownedWt) <- activeWidgetTypes
        let allWt = fwWt ++ ownedWt
        ets  <- activeEventTypes
        acs  <- activeAnnotationCategories
        let src = generatePySdk allWt ets acs
        respondAndExit $ responseLBS status200
            [ ("Content-Type", "text/x-python; charset=utf-8")
            , ("Content-Disposition", "inline; filename=\"ihf-client.py\"")
            ]
            (LBS.fromStrict (TE.encodeUtf8 src))

-- | Convert registry name to TypeScript enum identifier (PascalCase).
-- e.g. "data-table" -> "DataTable", "ux-friction" -> "UxFriction"
toPascalCase :: Text -> Text
toPascalCase = T.concat . map capitalise . T.splitOn "-"
  where capitalise "" = ""
        capitalise t  = T.toUpper (T.take 1 t) <> T.drop 1 t

-- | Convert registry name to Python UPPER_SNAKE identifier.
-- e.g. "data-table" -> "DATA_TABLE", "ux-friction" -> "UX_FRICTION"
toUpperSnake :: Text -> Text
toUpperSnake = T.toUpper . T.replace "-" "_"

generateTsSdk :: [WidgetTypeRegistry] -> [EventTypeRegistry] -> [AnnotationCategoryRegistry] -> Text
generateTsSdk wts ets acs = T.unlines
    [ "// Auto-generated by IHF. Do not edit manually."
    , "// Regenerate: curl <base>/api/v2/sdk/ihf-client.ts > ihf-client.ts"
    , ""
    , "export enum WidgetType {"
    ] <> T.unlines (map (\r -> "  " <> toPascalCase r.name <> " = \"" <> r.name <> "\",") wts)
    <> "}\n\nexport enum EventType {\n"
    <> T.unlines (map (\r -> "  " <> toPascalCase r.name <> " = \"" <> r.name <> "\",") ets)
    <> "}\n\nexport enum AnnotationCategory {\n"
    <> T.unlines (map (\r -> "  " <> toPascalCase r.name <> " = \"" <> r.name <> "\",") acs)
    <> "}\n\n"
    <> tsSdkClientClass

tsSdkClientClass :: Text
tsSdkClientClass = T.unlines
    [ "export interface IhfApiOptions {"
    , "  baseUrl: string;"
    , "  bearerToken: string;"
    , "}"
    , ""
    , "export class IhfClient {"
    , "  constructor(private opts: IhfApiOptions) {}"
    , ""
    , "  private async fetch(path: string, method = 'GET', body?: object): Promise<Response> {"
    , "    return fetch(this.opts.baseUrl + path, {"
    , "      method,"
    , "      headers: {"
    , "        'Authorization': 'Bearer ' + this.opts.bearerToken,"
    , "        'Content-Type': 'application/json',"
    , "      },"
    , "      body: body ? JSON.stringify(body) : undefined,"
    , "    });"
    , "  }"
    , ""
    , "  async getWidgets(params?: { page?: number; perPage?: number }) {"
    , "    const q = params ? `?page=${params.page ?? 1}&per_page=${params.perPage ?? 50}` : '';"
    , "    return this.fetch('/widgets' + q).then(r => r.json());"
    , "  }"
    , ""
    , "  async getInteractionEvents(params?: { widgetId?: string; eventType?: EventType }) {"
    , "    const qs = new URLSearchParams();"
    , "    if (params?.widgetId) qs.set('widgetId', params.widgetId);"
    , "    if (params?.eventType) qs.set('eventType', params.eventType);"
    , "    return this.fetch('/interaction-events?' + qs).then(r => r.json());"
    , "  }"
    , ""
    , "  async submitInteractionEvent(body: { widgetId: string; eventType: EventType; viewContext?: string; metadata?: object }) {"
    , "    return this.fetch('/interaction-events', 'POST', body).then(r => r.json());"
    , "  }"
    , ""
    , "  async submitAnnotation(body: { widgetId: string; category: AnnotationCategory; body: string }) {"
    , "    return this.fetch('/annotations', 'POST', body).then(r => r.json());"
    , "  }"
    , "}"
    ]

generatePySdk :: [WidgetTypeRegistry] -> [EventTypeRegistry] -> [AnnotationCategoryRegistry] -> Text
generatePySdk wts ets acs = T.unlines
    [ "# Auto-generated by IHF. Do not edit manually."
    , "# Regenerate: curl <base>/api/v2/sdk/ihf-client.py > ihf_client.py"
    , ""
    , "from enum import Enum"
    , "from typing import Optional, Any"
    , "import urllib.request, urllib.parse, json"
    , ""
    , "class WidgetType(str, Enum):"
    ] <> T.unlines (map (\r -> "    " <> toUpperSnake r.name <> " = \"" <> r.name <> "\"") wts)
    <> "\nclass EventType(str, Enum):\n"
    <> T.unlines (map (\r -> "    " <> toUpperSnake r.name <> " = \"" <> r.name <> "\"") ets)
    <> "\nclass AnnotationCategory(str, Enum):\n"
    <> T.unlines (map (\r -> "    " <> toUpperSnake r.name <> " = \"" <> r.name <> "\"") acs)
    <> "\n"
    <> pyClientClass

pyClientClass :: Text
pyClientClass = T.unlines
    [ "class IhfClient:"
    , "    def __init__(self, base_url: str, bearer_token: str):"
    , "        self.base_url = base_url.rstrip('/')"
    , "        self.token = bearer_token"
    , ""
    , "    def _request(self, path: str, method: str = 'GET', body: Optional[dict] = None) -> dict:"
    , "        url = self.base_url + path"
    , "        data = json.dumps(body).encode('utf-8') if body else None"
    , "        req = urllib.request.Request(url, data=data, method=method,"
    , "            headers={'Authorization': 'Bearer ' + self.token, 'Content-Type': 'application/json'})"
    , "        with urllib.request.urlopen(req) as resp:"
    , "            return json.loads(resp.read())"
    , ""
    , "    def get_widgets(self, page: int = 1, per_page: int = 50) -> dict:"
    , "        return self._request(f'/widgets?page={page}&per_page={per_page}')"
    , ""
    , "    def get_interaction_events(self, widget_id: Optional[str] = None, event_type: Optional[EventType] = None) -> dict:"
    , "        qs = urllib.parse.urlencode({k: v for k, v in {'widgetId': widget_id, 'eventType': event_type and str(event_type)}.items() if v})"
    , "        return self._request('/interaction-events' + ('?' + qs if qs else ''))"
    , ""
    , "    def submit_interaction_event(self, widget_id: str, event_type: EventType, view_context: Optional[str] = None, metadata: Optional[dict] = None) -> dict:"
    , "        body: dict = {'widgetId': widget_id, 'eventType': str(event_type)}"
    , "        if view_context: body['viewContext'] = view_context"
    , "        if metadata: body['metadata'] = metadata"
    , "        return self._request('/interaction-events', 'POST', body)"
    , ""
    , "    def submit_annotation(self, widget_id: str, category: AnnotationCategory, body: str) -> dict:"
    , "        return self._request('/annotations', 'POST', {'widgetId': widget_id, 'category': str(category), 'body': body})"
    ]

sdkIndexHtml :: LBS.ByteString
sdkIndexHtml = LBS.fromStrict $ TE.encodeUtf8 $ T.unlines
    [ "<!DOCTYPE html><html lang='en'><head><meta charset='UTF-8'/>"
    , "<title>IHF API v2 — SDKs</title>"
    , "<link rel='stylesheet' href='/app.css'/></head><body class='bg-gray-50 p-8'>"
    , "<h1 class='text-2xl font-bold mb-4'>IHF Consumer SDKs</h1>"
    , "<p class='mb-6 text-gray-600'>Both SDKs are generated live from the type registries. Download and import directly.</p>"
    , "<div class='space-y-4'>"
    , "<div class='bg-white border rounded p-4'>"
    , "<h2 class='font-semibold'>TypeScript / Node.js</h2>"
    , "<p class='text-sm text-gray-500 mb-2'>ES2020 module. Typed enums for all widget types, event types, annotation categories.</p>"
    , "<a href='/api/v2/sdk/ihf-client.ts' class='text-indigo-600 text-sm'>Download ihf-client.ts</a>"
    , "</div>"
    , "<div class='bg-white border rounded p-4'>"
    , "<h2 class='font-semibold'>Python</h2>"
    , "<p class='text-sm text-gray-500 mb-2'>stdlib-only (no third-party deps). str-Enum classes for all registered types.</p>"
    , "<a href='/api/v2/sdk/ihf-client.py' class='text-indigo-600 text-sm'>Download ihf-client.py</a>"
    , "</div>"
    , "</div>"
    , "<p class='mt-6 text-sm text-gray-400'>See <a href='/api/v2/docs' class='text-indigo-500'>API documentation</a> for full endpoint reference.</p>"
    , "</body></html>"
    ]