// Zoho Cliq API Module
// EU data center: https://cliq.zoho.eu
// API: https://www.zoho.com/cliq/help/restapi/v2/

var API_BASE = 'https://cliq.zoho.eu';

function makeRequest(token, method, path, jsonBody, queryParams) {
    var url = API_BASE + path;

    if (queryParams) {
        var qs = [];
        for (var key in queryParams) {
            if (queryParams.hasOwnProperty(key) && queryParams[key] !== undefined) {
                qs.push(encodeURIComponent(key) + '=' + encodeURIComponent(queryParams[key]));
            }
        }
        if (qs.length > 0) {
            url += '?' + qs.join('&');
        }
    }

    var headers = {
        'Authorization': 'Zoho-oauthtoken ' + token
    };
    var body = null;

    if (jsonBody) {
        body = JSON.stringify(jsonBody);
        headers['Content-Type'] = 'application/json;charset=UTF-8';
    }

    var resp = shadowman.http.request(url, {
        method: method,
        body: body,
        headers: headers
    });

    if (resp.status === 401) {
        return { _tokenExpired: true };
    }

    if (resp.status >= 400) {
        var raw = resp.body;
        var msg;
        if (typeof raw === 'string') {
            try {
                var p = JSON.parse(raw);
                msg = p.error && p.error.message ? p.error.message : raw;
            } catch (e) {
                msg = raw;
            }
        } else if (raw && typeof raw === 'object') {
            msg = (raw.error && raw.error.message) || raw.message || raw.description || JSON.stringify(raw);
        } else {
            msg = String(raw);
        }
        return { error: 'Zoho Cliq API error (' + resp.status + '): ' + msg };
    }

    if (resp.body && typeof resp.body === 'object') {
        return resp.body;
    }

    if (!resp.body || (typeof resp.body === 'string' && resp.body.trim() === '')) {
        return { success: true };
    }

    try {
        return JSON.parse(resp.body);
    } catch (e) {
        return { error: 'Invalid JSON response: ' + resp.body };
    }
}

function apiCall(token, method, path, jsonBody, queryParams) {
    var result = makeRequest(token, method, path, jsonBody, queryParams);
    if (result && result._tokenExpired) {
        var auth = require('./auth');
        var newToken = auth.getValidToken();
        if (!newToken) {
            return { error: 'Authentication expired and refresh failed. Re-run setup_auth.' };
        }
        return makeRequest(newToken, method, path, jsonBody, queryParams);
    }
    return result;
}

// --- List chats (channels + direct chats) ---
// GET /api/v2/chats

function listChats(token) {
    return apiCall(token, 'GET', '/api/v2/chats');
}

// --- List channels ---
// GET /api/v2/channels

function listChannels(token) {
    return apiCall(token, 'GET', '/api/v2/channels');
}

// --- Get messages from a chat ---
// GET /api/v2/chats/{chat_id}/messages

function getMessages(token, chatId) {
    return apiCall(token, 'GET',
        '/api/v2/chats/{CHATID}/messages'
        .replace('{CHATID}', chatId));
}

// --- Post message to a chat ---
// POST /api/v2/chats/{chat_id}/message  (singular!)

function sendMessage(token, chatId, message) {
    var url = API_BASE + '/api/v2/chats/' + chatId + '/message';
    var body = JSON.stringify({ text: message });
    var headers = {
        'Authorization': 'Zoho-oauthtoken ' + token,
        'Content-Type': 'application/json'
    };
    return makeRawRequest(token, 'POST', url, body, headers);
}

// --- Post message to a channel ---
// POST /api/v2/channelsbyname/{channel_unique_name}/message

function postToChannel(token, channelName, message) {
    var url = API_BASE + '/api/v2/channelsbyname/' + channelName + '/message';
    var body = JSON.stringify({ text: message });
    var headers = {
        'Authorization': 'Zoho-oauthtoken ' + token,
        'Content-Type': 'application/json'
    };
    return makeRawRequest(token, 'POST', url, body, headers);
}

function makeRawRequest(token, method, url, body, headers) {
    var resp = shadowman.http.request(url, {
        method: method,
        body: body,
        headers: headers
    });

    if (resp.status >= 400) {
        var raw = resp.body;
        var msg;
        if (typeof raw === 'string') {
            try {
                var p = JSON.parse(raw);
                msg = p.error && p.error.message ? p.error.message : raw;
            } catch (e) {
                msg = raw;
            }
        } else if (raw && typeof raw === 'object') {
            msg = (raw.error && raw.error.message) || raw.message || raw.description || JSON.stringify(raw);
        } else {
            msg = String(raw);
        }
        return { error: 'Zoho Cliq API error (' + resp.status + '): ' + msg };
    }

    if (resp.body && typeof resp.body === 'object') {
        return resp.body;
    }

    if (!resp.body || (typeof resp.body === 'string' && resp.body.trim() === '')) {
        return { success: true };
    }

    try {
        return JSON.parse(resp.body);
    } catch (e) {
        return { error: 'Invalid JSON response: ' + resp.body };
    }
}

module.exports = {
    listChats: listChats,
    listChannels: listChannels,
    getMessages: getMessages,
    sendMessage: sendMessage,
    postToChannel: postToChannel
};