-- "Википедия Эйнштейн" → fetch ru.wikipedia.org/api/rest_v1/page/summary/<topic>
-- Falls back to LLM if Wikipedia doesn't have the article.
local phrase = (jarvis.context.phrase or "")

local query = jarvis.text.strip_trigger(phrase:lower(), {
    "найди в википедии про",
    "найди в википедии",
    "что говорит википедия",
    "поищи в википедии",
    "статья из википедии",
    "википедия про",
    "википедия о",
    "википедия",
    "расскажи про",
    "что такое",
    "кто такая",
    "кто такой",
    "look up in wikipedia",
    "wikipedia article on",
    "wikipedia about",
    "wikipedia",
    "tell me about",
    "what is",
    "who is",
    "знайди у вікіпедії",
    "вікіпедія",
    "що таке",
    "хто такий",
    "розкажи про",
})
query = query:gsub("^[%s,:%.]+", ""):gsub("%s+$", "")

if query == "" then
    return jarvis.cmd.error("Какая статья?")
end

-- Wikipedia title needs underscores for spaces. Capitalize first letter of each word
-- to match canonical titles (good enough heuristic).
local title = query:gsub("(%S+)", function(w)
    -- Capitalize first byte (works for ASCII; for cyrillic, leave alone).
    local first = w:sub(1, 1)
    if first:match("[%a]") then
        return first:upper() .. w:sub(2)
    end
    return w
end):gsub(" ", "_")

local function urlencode(s)
    return (s:gsub("[^A-Za-z0-9%-_%.~]", function(c)
        return string.format("%%%02X", string.byte(c))
    end))
end

-- Try Russian first, fall back to English.
local lang_chain = { "ru", "en" }
local data, source_lang

for _, lang in ipairs(lang_chain) do
    local url = string.format("https://%s.wikipedia.org/api/rest_v1/page/summary/%s",
        lang, urlencode(title))
    local d = jarvis.http.json(url)
    if d and d.extract and d.extract ~= "" then
        data = d
        source_lang = lang
        break
    end
end

if not data then
    -- last resort: ask LLM directly
    local llm_answer = jarvis.llm({
        { role = "system", content = "Кратко (2-3 предложения) на русском объясни тему. Если не знаешь — скажи." },
        { role = "user", content = "Расскажи про: " .. query }
    }, { max_tokens = 200, temperature = 0.3 })
    if llm_answer and llm_answer ~= "" then
        return jarvis.cmd.ok(llm_answer)
    end
    return jarvis.cmd.not_found("В Википедии нет статьи про " .. query .. ".")
end

local extract = data.extract
local title_actual = data.title or query

-- Truncate extract to ~3 sentences for spoken output
local sentences = {}
for sentence in extract:gmatch("[^%.%!%?]+[%.%!%?]") do
    table.insert(sentences, sentence)
    if #sentences >= 3 then break end
end
local spoken = #sentences > 0 and table.concat(sentences) or extract:sub(1, 400)

if source_lang == "en" then
    -- Translate English extract to Russian via LLM (no point in speaking English
    -- through a Russian voice).
    local translated = jarvis.llm({
        { role = "system", content = "Переведи английский текст на русский, без вводных и комментариев." },
        { role = "user", content = spoken }
    }, { max_tokens = 300, temperature = 0.0 })
    if translated and translated ~= "" then
        spoken = translated
    end
end

jarvis.system.notify("Wikipedia: " .. title_actual, spoken:sub(1, 200))
return jarvis.cmd.ok(spoken)