// Zoho Projects Tasks API Module
// EU data center base: https://projectsapi.zoho.eu

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

function makeRequest(token, method, path, params) {
    var portalId = shadowman.config.value('portal_id');
    if (!portalId) {
        return null; // Let the caller handle missing portal ID
    }

    // Use Zoho Projects API domain. EU data center: projectsapi.zoho.eu
    // Note: auth may return api_domain as www.zohoapis.eu (generic), but Projects
    // requires its own domain.
    var apiBase = 'https://projectsapi.zoho.eu';

    // Replace placeholders in path
    var url = path.replace('{PORTALID}', portalId);
    var fullUrl = apiBase + url;

    var headers = {
        'Authorization': 'Zoho-oauthtoken ' + token,
        'Content-Type': 'application/x-www-form-urlencoded'
    };

    var body = null;
    var contentType = 'application/x-www-form-urlencoded';

    if (method === 'GET' && params) {
        var qs = [];
        for (var key in params) {
            if (params.hasOwnProperty(key) && params[key] !== undefined) {
                qs.push(encodeURIComponent(key) + '=' + encodeURIComponent(params[key]));
            }
        }
        if (qs.length > 0) {
            fullUrl += '?' + qs.join('&');
        }
    } else if (method === 'POST' && params) {
        var parts = [];
        for (var key in params) {
            if (params.hasOwnProperty(key) && params[key] !== undefined) {
                parts.push(encodeURIComponent(key) + '=' + encodeURIComponent(params[key]));
            }
        }
        body = parts.join('&');
    }

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

    if (resp.status === 401) {
        // Token might have expired - signal to retry
        return { _tokenExpired: true };
    }

    if (resp.status >= 400) {
        shadowman.log.error('Zoho API error: ' + resp.status + ' ' + resp.body);
        var errBody;
        try {
            errBody = JSON.parse(resp.body);
        } catch (e) {
            errBody = { error: resp.body };
        }
        return { error: 'Zoho API error (' + resp.status + '): ' + (errBody.description || errBody.message || errBody.error || resp.body) };
    }

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

// Retry wrapper - auto-refreshes token on 401
function apiCall(token, method, path, params) {
    var result = makeRequest(token, method, path, params);
    if (result && result._tokenExpired) {
        // Token expired, trigger a refresh via auth module
        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, params);
    }
    return result;
}

function listProjects(token, index) {
    var portalId = shadowman.config.value('portal_id');
    if (!portalId) {
        return { error: 'Missing portal_id in plugin config.' };
    }
    return apiCall(token, 'GET', '/restapi/portal/{PORTALID}/projects/', {
        index: String(index)
    });
}

function listTasks(token, projectId, filters) {
    var portalId = shadowman.config.value('portal_id');
    if (!portalId) {
        return { error: 'Missing portal_id in plugin config.' };
    }

    var params = {};
    if (filters.status) params.status = filters.status;
    if (filters.priority) params.priority = filters.priority;
    if (filters.owner) params.owner = filters.owner;
    if (filters.index) params.index = String(filters.index);
    if (filters.milestone_id) params.milestone_id = filters.milestone_id;
    if (filters.tasklist_id) params.tasklist_id = filters.tasklist_id;

    return apiCall(token, 'GET', '/restapi/portal/{PORTALID}/projects/{PROJECTID}/tasks/'
        .replace('{PROJECTID}', projectId), params);
}

function getTask(token, projectId, taskId) {
    var portalId = shadowman.config.value('portal_id');
    if (!portalId) {
        return { error: 'Missing portal_id in plugin config.' };
    }
    return apiCall(token, 'GET',
        '/restapi/portal/{PORTALID}/projects/{PROJECTID}/tasks/{TASKID}/'
        .replace('{PROJECTID}', projectId)
        .replace('{TASKID}', taskId), {});
}

function createTask(token, projectId, args) {
    var portalId = shadowman.config.value('portal_id');
    if (!portalId) {
        return { error: 'Missing portal_id in plugin config.' };
    }

    var params = { name: args.name };
    if (args.description) params.description = args.description;
    if (args.person_responsible) params.person_responsible = String(args.person_responsible);
    if (args.priority) params.priority = args.priority;
    if (args.start_date) params.start_date = args.start_date;
    if (args.end_date) params.end_date = args.end_date;
    if (args.tasklist_id) params.tasklist_id = String(args.tasklist_id);
    if (args.milestone_id) params.milestone_id = String(args.milestone_id);
    if (args.percent_complete) params.percent_complete = String(args.percent_complete);

    return apiCall(token, 'POST',
        '/restapi/portal/{PORTALID}/projects/{PROJECTID}/tasks/'
        .replace('{PROJECTID}', projectId), params);
}

function updateTask(token, projectId, taskId, args) {
    var portalId = shadowman.config.value('portal_id');
    if (!portalId) {
        return { error: 'Missing portal_id in plugin config.' };
    }

    var params = {};
    if (args.name) params.name = args.name;
    if (args.description !== undefined) params.description = args.description;
    if (args.person_responsible) params.person_responsible = String(args.person_responsible);
    if (args.priority) params.priority = args.priority;
    if (args.start_date) params.start_date = args.start_date;
    if (args.end_date) params.end_date = args.end_date;
    if (args.percent_complete !== undefined) params.percent_complete = String(args.percent_complete);

    return apiCall(token, 'POST',
        '/restapi/portal/{PORTALID}/projects/{PROJECTID}/tasks/{TASKID}/'
        .replace('{PROJECTID}', projectId)
        .replace('{TASKID}', taskId), params);
}

function deleteTask(token, projectId, taskId) {
    var portalId = shadowman.config.value('portal_id');
    if (!portalId) {
        return { error: 'Missing portal_id in plugin config.' };
    }
    return apiCall(token, 'DELETE',
        '/restapi/portal/{PORTALID}/projects/{PROJECTID}/tasks/{TASKID}/'
        .replace('{PROJECTID}', projectId)
        .replace('{TASKID}', taskId), {});
}

function getMyTasks(token, filters) {
    var portalId = shadowman.config.value('portal_id');
    if (!portalId) {
        return { error: 'Missing portal_id in plugin config.' };
    }

    var params = {};
    if (filters.status) params.status = filters.status;
    if (filters.priority) params.priority = filters.priority;
    if (filters.index) params.index = String(filters.index);

    return apiCall(token, 'GET', '/restapi/portal/{PORTALID}/mytasks/', params);
}

function searchTasks(token, args) {
    // Zoho Projects doesn't have a dedicated search endpoint, so we search across all projects
    var portalId = shadowman.config.value('portal_id');
    if (!portalId) {
        return { error: 'Missing portal_id in plugin config.' };
    }

    var query = args.query;
    var projectId = args.project_id;

    if (projectId) {
        // Search within a specific project
        var result = apiCall(token, 'GET',
            '/restapi/portal/{PORTALID}/projects/{PROJECTID}/tasks/'
            .replace('{PROJECTID}', projectId), {
                index: '1'
            });

        if (result.error) return result;

        var tasks = result.tasks || [];
        var matched = [];
        for (var i = 0; i < tasks.length; i++) {
            var t = tasks[i];
            if (t.name && t.name.toLowerCase().indexOf(query.toLowerCase()) !== -1) {
                matched.push(t);
            } else if (t.description && t.description.toLowerCase().indexOf(query.toLowerCase()) !== -1) {
                matched.push(t);
            }
        }
        return { tasks: matched, total: matched.length, query: query };
    }

    // Search across all projects - first get project list
    var projects = apiCall(token, 'GET', '/restapi/portal/{PORTALID}/projects/', {});
    if (projects.error) return projects;

    var allTasks = [];
    var projectList = projects.projects || [];

    for (var p = 0; p < projectList.length; p++) {
        var proj = projectList[p];
        var taskResult = apiCall(token, 'GET',
            '/restapi/portal/{PORTALID}/projects/{PROJECTID}/tasks/'
            .replace('{PROJECTID}', String(proj.id)), {
                index: '1'
            });

        if (taskResult.error) continue;

        var tasks = taskResult.tasks || [];
        for (var i = 0; i < tasks.length; i++) {
            var t = tasks[i];
            if (t.name && t.name.toLowerCase().indexOf(query.toLowerCase()) !== -1) {
                t._project_name = proj.name;
                allTasks.push(t);
            } else if (t.description && t.description.toLowerCase().indexOf(query.toLowerCase()) !== -1) {
                t._project_name = proj.name;
                allTasks.push(t);
            }
        }
    }

    return { tasks: allTasks, total: allTasks.length, query: query };
}

module.exports = {
    listProjects: listProjects,
    listTasks: listTasks,
    getTask: getTask,
    createTask: createTask,
    updateTask: updateTask,
    deleteTask: deleteTask,
    getMyTasks: getMyTasks,
    searchTasks: searchTasks
};