// src/commands/jiraHistory.js
import {
    getJiraTicketsForStore,
    getJiraTicketsForComponentWithStore,
    getStatusEmoji,
    calculateDaysOpen
} from '../services/jiraService.js';
import { summarizeJiraTicket } from '../services/jiraSummarizer.js';
import { analyzeCommonIssues } from '../services/jiraSummarizer.js';
import jira from '../integrations/jira/JiraClient.js';
import { formatDisplayTime } from '../utils/time.js';
import { logger } from '../utils/logger.js';

const MAX_TICKETS = 20;

export async function handleJiraHistory(bot, trigger) {
    logger('jira:history', 'Handler entered', 'debug');

    // Support both Webex (args) and HTTP (query)
    const query = trigger.query || {};
    const args = trigger.args || [];

    const arg1 = args[0]?.trim() || query.storeNum || query.store || query.s;
    const arg2 = args[1]?.trim() || query.component || query.components;

    logger('jira:history', `Request for store/component: ${arg1} | ${arg2 || 'all'}`);

    if (!arg1) {
        const usage = '**Jira History Usage:**\n' +
            '`/jiraHistory 782` → All tickets (max 20)\n' +
            '`/jiraHistory 782 phone` → Communication Services only\n' +
            '`/jiraHistory 782 av,voice,mobility` → Multiple components';

        await bot.say('markdown', usage);
        return;
    }

    if (!/^\d{2,4}$/.test(arg1)) {
        await bot.say('markdown', 'Please provide a valid 2-4 digit store number.');
        return;
    }

    const storeNum = arg1.padStart(5, '0');   // normalize to 5 digits if needed

    try {
        let reply = `**Jira Tickets - Store ${storeNum}**\n\n`;

        let ticketKeys = [];

        if (!arg2 || arg2.toLowerCase() === 'all') {
            logger('jira:history', `Fetching all tickets for store ${storeNum}`, 'debug');
            const results = await getJiraTicketsForStore(storeNum);
            ticketKeys = results.map(t => t.key);
        } else {
            const components = arg2.split(',').map(c => c.trim().toLowerCase());
            logger('jira:history', `Fetching tickets for components: ${components.join(', ')}`, 'debug');

            for (const comp of components) {
                const results = await getJiraTicketsForComponentWithStore(storeNum, comp);
                ticketKeys = ticketKeys.concat(results.map(t => t.key));
            }
        }

        ticketKeys = [...new Set(ticketKeys)]; // dedup across components if any

        // Limit to most recent
        if (ticketKeys.length > MAX_TICKETS) {
            ticketKeys = ticketKeys.slice(0, MAX_TICKETS);
        }

        if (ticketKeys.length === 0) {
            reply += 'No matching Jira tickets found.\n';
        } else {
            logger('jira:history', `Fetching details for ${ticketKeys.length} tickets in parallel`, 'debug');

            const ticketPromises = ticketKeys.map(async (key) => {
                try {
                    const fullTicket = await jira.getTicket(key);
                    const aiSummary = await summarizeJiraTicket(fullTicket).catch(() =>
                        "**Reported Problem:** No details available.\n**Steps Taken:** No information recorded."
                    );

                    const fields = fullTicket.fields || {};
                    const statusEmoji = getStatusEmoji(fields.status?.name);
                    const component = fields.components?.[0]?.name || '—';
                    const assignee = fields.assignee?.displayName || '**Unassigned**';
                    const days = calculateDaysOpen(fields.created, fields.resolved || fields.updated);

                    return {
                        key,
                        summary: fields.summary || '—',
                        statusEmoji,
                        status: fields.status?.name || '—',
                        component,
                        assignee,
                        days,
                        aiSummary: aiSummary.substring(0, 800)   // Limit summary length
                    };
                } catch (err) {
                    logger('jira:history', `Failed to process ticket ${key}: ${err.message}`, 'warn');
                    return null;
                }
            });

            const ticketResults = (await Promise.all(ticketPromises)).filter(Boolean);

            // Build reply with length control
            let currentLength = reply.length;

            for (const t of ticketResults) {
                let ticketBlock = `**${t.key}** - ${t.summary}\n\n`;
                ticketBlock += `${t.aiSummary}\n\n`;
                ticketBlock += `${t.statusEmoji} **Status:** ${t.status} • Component: ${t.component}\n`;
                ticketBlock += `Assigned: ${t.assignee} • Open for: ${t.days} days\n\n`;
                ticketBlock += `---\n\n`;

                // Check if adding this ticket would exceed safe limit
                if (currentLength + ticketBlock.length > 6500) {
                    reply += `\n**... and ${ticketResults.length - ticketResults.indexOf(t)} more tickets.**\n`;
                    reply += `Use /jiraHistory ${storeNum} for full list.\n`;
                    break;
                }

                reply += ticketBlock;
                currentLength += ticketBlock.length;
            }

            // Common Issues Analysis (only if we have enough tickets and space)
            if (ticketResults.length >= 3 && currentLength < 6000) {
                reply += `**Common Issues Across These Tickets:**\n`;
                const common = await analyzeCommonIssues(ticketResults).catch(() =>
                    "Unable to identify common patterns at this time."
                );
                reply += `${common}\n`;
            }
        }

        reply += `\n*Last checked: ${formatDisplayTime()}*`;
        await bot.say('markdown', reply.trim());

    } catch (err) {
        logger('jira:history', `Error processing jiraHistory: ${err.message}`, 'error');
        await bot.say('markdown', `❌ Error retrieving Jira history: ${err.message}`);
    }
}

// (helpers imported from jiraService for consistency with jiraTicket etc.)