import fetch from 'node-fetch';

export function createWebexService(config, log) {
    const { logger, logError } = log;

    function handleWebexResponse(context, issueKey, response, responseText) {
        if (!response.ok) {
            logError(context, `Webex API error for ${issueKey} (HTTP ${response.status})`, responseText);
            return false;
        }
        logger(context, `Successfully sent notification for ${issueKey}`);
        return true;
    }

    function sendTicketCard(issueKey, body) {
        const requestOptions = {
            method: 'POST',
            headers: {
                Authorization: `Bearer ${config.webex.token}`,
                'Content-Type': 'application/json',
            },
            body: JSON.stringify(body),
            redirect: 'follow',
        };

        fetch('https://webexapis.com/v1/messages', requestOptions)
            .then(response => response.text().then(text => ({ response, text })))
            .then(({ response, text }) => handleWebexResponse('sendTicketCard', issueKey, response, text))
            .catch(error => logError('sendTicketCard', `Network error sending to Webex for ${issueKey}`, error));
    }

    function sendWebexMessage(body) {
        return new Promise(function (resolve, reject) {
            const requestOptions = {
                method: 'POST',
                headers: {
                    Authorization: `Bearer ${config.webex.token}`,
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify(body),
                redirect: 'follow',
            };

            fetch('https://webexapis.com/v1/messages', requestOptions)
                .then(response => response.text().then(text => ({ response, text })))
                .then(({ response, text }) => {
                    if (!response.ok) {
                        return reject(new Error(`Webex API error (HTTP ${response.status}): ${text}`));
                    }
                    try {
                        resolve(JSON.parse(text));
                    } catch {
                        reject(new Error(`Invalid JSON response from Webex: ${text}`));
                    }
                })
                .catch(error => reject(error));
        });
    }

    function sendHighPriorityMessage(body) {
        const requestOptions = {
            method: 'POST',
            headers: {
                Authorization: `Bearer ${config.jiraNotifier.token}`,
                'Content-Type': 'application/json',
            },
            body: JSON.stringify(body),
            redirect: 'follow',
        };

        fetch('https://webexapis.com/v1/messages', requestOptions)
            .then(response => response.text().then(text => ({ response, text })))
            .then(({ response, text }) => handleWebexResponse('sendHighPriorityMessage', body.roomId || 'unknown', response, text))
            .catch(error => logError('sendHighPriorityMessage', 'Network error sending to Webex', error));
    }

    function processHighSeverity(jiraTicket, roomId) {
        const jiraKey = jiraTicket.issue.key;

        if (jiraTicket.webhookEvent == 'comment_created' && jiraTicket.comment) {
            const action = jiraTicket.comment.created == jiraTicket.comment.updated ? 'added a comment' : 'edited a comment';
            const userName = jiraTicket.comment.updateAuthor.displayName;
            const projectKey = jiraTicket.issue.fields.project.name;
            const comment = jiraTicket.comment.body;
            sendHighPriorityMessage({
                markdown: `${userName} ${action} on the [${jiraKey}](https://aeo.atlassian.net/browse/${jiraKey}) issue in the ${projectKey} project to read as follows:\n${comment}`,
                roomId,
            });
        }

        if (jiraTicket.webhookEvent == 'jira:issue_updated' && jiraTicket.changelog) {
            const userName = jiraTicket.user.displayName;
            const statuses = ['status', 'Severity', 'priority', 'Severity (migrated)'];
            let text = '';
            let addDescription = 0;

            for (const change of jiraTicket.changelog.items) {
                if (statuses.includes(change.field)) {
                    text += `${userName} changed ${change.field} from ${change.fromString} to ${change.toString} for issue [${jiraKey}](https://aeo.atlassian.net/browse/${jiraKey}).\n`;
                }
                if (change.field == 'Severity' || change.field == 'priority') {
                    addDescription = 1;
                }
            }

            if (addDescription > 0) {
                text += `Description / Details: ${jiraTicket.issue.fields.description}\n`;
            }

            log.logDebug('processHighSeverity', `Sending high-priority update for ${jiraKey}`);
            sendHighPriorityMessage({ markdown: text, roomId });
        }
    }

    return {
        sendTicketCard,
        sendWebexMessage,
        sendHighPriorityMessage,
        processHighSeverity,
    };
}