/**
 * Voxyz Daily Mission Generation Agent
 * AI-powered agent that generates daily mission proposals at 7 AM
 * Phase 10: Autonomous Architecture
 */

import { 
  DailyMission, 
  DailyMissionInsert,
  MissionProposal, 
  MissionProposalInsert,
  DailyMissionGenerationInput,
  DailyMissionGenerationResult,
  AgentExecutionLog,
  CalendarBlock
} from '@/lib/supabase/voxyz.types';
import { Task, fetchAllTasks } from '@/lib/data/tasks';
import { Project, fetchAllProjects } from '@/lib/data/projects';
import { 
  createProposalFromTask, 
  ProposalContext, 
  validateProposalAgainstCapGates,
  saveProposal 
} from '@/lib/services/proposal.service';
import { 
  checkCapGates, 
  getCapacityStatus,
  initializeCapGates,
  resetCapGatesForNewDay
} from '@/lib/services/cap-gates.service';
import { getServiceSupabase } from '@/lib/supabase/client';

const GENERATION_HOUR = 7;
const GENERATION_MINUTE = 0;

/**
 * Generate daily missions for a specific date
 * This is the main entry point for the daily mission generation agent
 */
export async function generateDailyMissions(
  input: DailyMissionGenerationInput
): Promise<DailyMissionGenerationResult | null> {
  const executionLogId = await startExecutionLog('proposal_generator', 'scheduled');
  const startTime = Date.now();
  
  try {
    // Step 1: Initialize/reset cap gates for the day
    await initializeCapGates();
    if (isNewDay()) {
      await resetCapGatesForNewDay();
    }
    
    // Step 2: Fetch all active tasks and projects
    const [tasks, projects] = await Promise.all([
      fetchAllTasks(),
      fetchAllProjects(),
    ]);
    
    // Step 3: Filter to active, non-done tasks
    const activeTasks = tasks.filter(task => 
      task.status !== 'done' && 
      task.status !== 'canceled' &&
      task.status !== 'archived'
    );
    
    // Step 4: Score and rank tasks
    const scoredTasks = scoreAndRankTasks(activeTasks, projects);
    
    // Step 5: Get capacity status
    const capacityStatus = await getCapacityStatus();
    
    // Step 6: Generate proposals up to the limit
    const proposals: MissionProposal[] = [];
    const calendarBlocks: CalendarBlock[] = [];
    
    const targetCount = Math.min(
      input.targetMissionCount,
      capacityStatus.dailyMissionsRemaining
    );
    
    for (let i = 0; i < scoredTasks.length && proposals.length < targetCount; i++) {
      const { task, project, score } = scoredTasks[i];
      
      // Check if we can add another proposal
      const canAdd = await canAddAnotherProposal(task, proposals);
      if (!canAdd.allowed) {
        break;
      }
      
      // Create proposal
      const context: ProposalContext = {
        currentTime: new Date(),
        activeTasks,
        recentProposals: proposals,
      };
      
      const proposalInsert = createProposalFromTask(task, project, context);
      
      // Validate against cap gates
      const existingProposals = proposals.map(p => ({
        ...p,
        created_at: new Date().toISOString(),
        updated_at: new Date().toISOString(),
        expires_at: new Date(Date.now() + 24 * 60 * 60 * 1000).toISOString(),
      })) as MissionProposal[];
      
      const capGateResult = await validateProposalAgainstCapGates(
        proposalInsert,
        existingProposals
      );
      
      if (capGateResult.allPassed || i < 2) { // Allow first 2 even if gates fail
        // Save proposal to database
        const savedProposal = await saveProposal(proposalInsert, capGateResult);
        
        if (savedProposal) {
          proposals.push(savedProposal);
          
          // Create calendar block
          const calendarBlock = await createCalendarBlockForProposal(savedProposal);
          if (calendarBlock) {
            calendarBlocks.push(calendarBlock);
          }
        }
      }
    }
    
    // Step 7: Create daily mission record
    const dailyMission = await createDailyMissionRecord(
      input.date,
      proposals,
      calendarBlocks
    );
    
    // Step 8: Complete execution log
    const duration = Date.now() - startTime;
    await completeExecutionLog(executionLogId, {
      status: 'success',
      duration,
      proposalsCreated: proposals.length,
      tasksAnalyzed: activeTasks.length,
      outputSummary: {
        date: input.date.toISOString(),
        missionsGenerated: proposals.length,
        primaryMissionId: proposals[0]?.id,
        secondaryMissionId: proposals[1]?.id,
        tertiaryMissionId: proposals[2]?.id,
      },
    });
    
    // Step 9: Return result
    const finalCapGateCheck = await checkCapGates(0, proposals);
    
    return {
      dailyMission,
      proposals,
      capGatesChecked: finalCapGateCheck,
      calendarBlocks,
      executionLogId,
    };
    
  } catch (error) {
    console.error('Error generating daily missions:', error);
    
    // Log failure
    await completeExecutionLog(executionLogId, {
      status: 'failed',
      duration: Date.now() - startTime,
      errorMessage: error instanceof Error ? error.message : 'Unknown error',
    });
    
    return null;
  }
}

/**
 * Score and rank tasks for mission selection
 */
function scoreAndRankTasks(
  tasks: Task[],
  projects: Project[]
): Array<{ task: Task; project: Project | undefined; score: number }> {
  const projectMap = new Map(projects.map(p => [p.id, p]));
  const now = new Date();
  
  const scored = tasks.map(task => {
    const project = projectMap.get(task.projectId);
    let score = 0;
    
    // Priority score (0-25)
    const priorityScores: Record<string, number> = {
      'urgent': 25,
      'high': 20,
      'medium': 12,
      'low': 5,
    };
    score += priorityScores[task.priority] || 10;
    
    // Deadline score (0-30)
    if (task.dueDate) {
      const dueDate = new Date(task.dueDate);
      const hoursUntil = (dueDate.getTime() - now.getTime()) / (1000 * 60 * 60);
      
      if (hoursUntil < 0) score += 30; // Overdue
      else if (hoursUntil < 24) score += 27;
      else if (hoursUntil < 72) score += 21;
      else if (hoursUntil < 168) score += 15;
      else if (hoursUntil < 336) score += 9;
      else score += 3;
    }
    
    // Staleness score (0-15)
    const updatedAt = new Date(task.updatedAt);
    const daysSinceUpdate = (now.getTime() - updatedAt.getTime()) / (1000 * 60 * 60 * 24);
    
    if (task.status === 'blocked') {
      score += 15;
    } else if (daysSinceUpdate > 14) {
      score += 12;
    } else if (daysSinceUpdate > 7) {
      score += 9;
    } else if (daysSinceUpdate > 3) {
      score += 5;
    }
    
    // Project importance (0-20)
    if (project) {
      const nameLower = project.name.toLowerCase();
      if (nameLower.includes('ios') || nameLower.includes('revenue')) {
        score += 20;
      } else if (nameLower.includes('mission') || nameLower.includes('critical')) {
        score += 15;
      } else {
        score += 10;
      }
    }
    
    // Status bonus (0-10)
    if (task.status === 'in-progress') {
      score += 10; // Finish what's started
    } else if (task.status === 'todo') {
      score += 5;
    }
    
    return { task, project, score };
  });
  
  // Sort by score descending
  return scored.sort((a, b) => b.score - a.score);
}

/**
 * Check if we can add another proposal
 */
async function canAddAnotherProposal(
  task: Task,
  existingProposals: MissionProposal[]
): Promise<{ allowed: boolean; reason?: string }> {
  const capacity = await getCapacityStatus();
  
  if (capacity.dailyMissionsRemaining <= 0) {
    return { allowed: false, reason: 'Daily mission limit reached' };
  }
  
  // Check for duplicates
  const isDuplicate = existingProposals.some(p => 
    p.source_task_ids.includes(task.id)
  );
  if (isDuplicate) {
    return { allowed: false, reason: 'Task already has a proposal' };
  }
  
  return { allowed: true };
}

/**
 * Create a calendar block for a proposal
 */
async function createCalendarBlockForProposal(
  proposal: MissionProposal
): Promise<CalendarBlock | null> {
  const supabase = getServiceSupabase();
  
  const startTime = proposal.suggested_start_time 
    ? new Date(proposal.suggested_start_time)
    : new Date(new Date().setHours(9, 0, 0, 0));
  
  const duration = proposal.estimated_duration_minutes || 120;
  const endTime = new Date(startTime.getTime() + duration * 60000);
  
  const block: Omit<CalendarBlock, 'id' | 'created_at' | 'updated_at'> = {
    block_date: proposal.proposal_date,
    start_time: startTime.toISOString(),
    end_time: endTime.toISOString(),
    block_type: 'mission_execution',
    mission_id: null, // Will be set when daily mission is created
    proposal_id: proposal.id,
    calendar_event_id: null,
    calendar_provider: 'google',
    calendar_synced: false,
    calendar_synced_at: null,
    status: 'scheduled',
    notes: proposal.title,
  };
  
  const { data, error } = await supabase
    .from('ops_calendar_blocks')
    .insert(block)
    .select()
    .single();
  
  if (error) {
    console.error('Error creating calendar block:', error);
    return null;
  }
  
  return data as CalendarBlock;
}

/**
 * Create daily mission record
 */
async function createDailyMissionRecord(
  date: Date,
  proposals: MissionProposal[],
  calendarBlocks: CalendarBlock[]
): Promise<DailyMission> {
  const supabase = getServiceSupabase();
  
  const totalMinutes = proposals.reduce((sum, p) => 
    sum + (p.estimated_duration_minutes || 120), 0
  );
  
  // Calculate focus time (exclude reaction time)
  const workdayMinutes = 480;
  const reactionRatio = 0.30;
  const focusMinutes = Math.round(totalMinutes * (1 - reactionRatio));
  
  // Calculate focus time window
  const focusStart = proposals[0]?.suggested_start_time 
    ? new Date(proposals[0].suggested_start_time)
    : new Date(date.setHours(9, 0, 0, 0));
  const focusEnd = new Date(focusStart.getTime() + focusMinutes * 60000);
  
  const missionInsert: Omit<DailyMission, 'id' | 'created_at' | 'updated_at'> = {
    mission_date: date.toISOString().split('T')[0],
    generated_at: new Date().toISOString(),
    generated_by: 'ai_agent',
    status: 'draft',
    primary_mission_id: proposals[0]?.id || null,
    secondary_mission_id: proposals[1]?.id || null,
    tertiary_mission_id: proposals[2]?.id || null,
    total_estimated_minutes: totalMinutes,
    focus_time_start: focusStart.toISOString(),
    focus_time_end: focusEnd.toISOString(),
    focus_time_minutes: focusMinutes,
    calendar_blocks: calendarBlocks.map(b => ({
      id: b.id,
      start_time: b.start_time,
      end_time: b.end_time,
      block_type: b.block_type,
    })),
    planned_reactions: Math.round(proposals.length * reactionRatio * 10),
    actual_reactions: 0,
    reaction_ratio: reactionRatio,
    completed_at: null,
    completion_notes: null,
    completion_rating: null,
    user_feedback: {},
  };
  
  const { data, error } = await supabase
    .from('ops_daily_missions')
    .insert(missionInsert)
    .select()
    .single();
  
  if (error) {
    console.error('Error creating daily mission:', error);
    throw error;
  }
  
  // Update calendar blocks with mission_id
  if (data) {
    for (const block of calendarBlocks) {
      await supabase
        .from('ops_calendar_blocks')
        .update({ mission_id: data.id })
        .eq('id', block.id);
    }
  }
  
  return data as DailyMission;
}

/**
 * Start execution log entry
 */
export async function startExecutionLog(
  agentName: 'proposal_generator' | 'cap_gate_validator' | 'calendar_scheduler' | 'trigger_monitor' | 'mission_optimizer' | 'stale_task_detector',
  executionType: 'scheduled' | 'triggered' | 'manual' | 'reaction'
): Promise<string> {
  const supabase = getServiceSupabase();
  
  const { data, error } = await supabase
    .from('ops_agent_execution_log')
    .insert({
      agent_name: agentName,
      execution_type: executionType,
      started_at: new Date().toISOString(),
      status: 'running',
      input_summary: {
        timestamp: new Date().toISOString(),
        agent: agentName,
        type: executionType,
      },
    })
    .select('id')
    .single();
  
  if (error) {
    console.error('Error starting execution log:', error);
    return '';
  }
  
  return data?.id || '';
}

/**
 * Complete execution log entry
 */
export async function completeExecutionLog(
  logId: string,
  result: {
    status: 'success' | 'partial' | 'failed';
    duration: number;
    proposalsCreated?: number;
    proposalsApproved?: number;
    tasksAnalyzed?: number;
    outputSummary?: Record<string, unknown>;
    errorMessage?: string;
  }
): Promise<void> {
  const supabase = getServiceSupabase();
  
  await supabase
    .from('ops_agent_execution_log')
    .update({
      completed_at: new Date().toISOString(),
      duration_ms: result.duration,
      status: result.status,
      proposals_created: result.proposalsCreated || 0,
      proposals_approved: result.proposalsApproved || 0,
      tasks_analyzed: result.tasksAnalyzed || 0,
      output_summary: result.outputSummary || {},
      error_message: result.errorMessage || null,
    })
    .eq('id', logId);
}

/**
 * Check if this is a new day (for cap gate reset)
 */
function isNewDay(): boolean {
  const now = new Date();
  return now.getHours() === GENERATION_HOUR && now.getMinutes() < 30;
}

/**
 * Get today's daily mission
 */
export async function getTodaysDailyMission(): Promise<DailyMission | null> {
  const supabase = getServiceSupabase();
  const today = new Date().toISOString().split('T')[0];
  
  const { data, error } = await supabase
    .from('ops_daily_missions')
    .select('*')
    .eq('mission_date', today)
    .single();
  
  if (error) {
    if (error.code === 'PGRST116') {
      return null; // No mission found
    }
    console.error('Error fetching daily mission:', error);
    return null;
  }
  
  return data as DailyMission;
}

/**
 * Check if daily missions need to be generated
 */
export async function shouldGenerateDailyMissions(): Promise<boolean> {
  const now = new Date();
  
  // Check if it's generation time (7 AM)
  if (now.getHours() !== GENERATION_HOUR) {
    return false;
  }
  
  // Check if already generated today
  const existingMission = await getTodaysDailyMission();
  if (existingMission) {
    return false;
  }
  
  return true;
}

/**
 * Run the daily mission generation agent
 * This is the entry point for scheduled execution
 */
export async function runDailyMissionGeneration(): Promise<DailyMissionGenerationResult | null> {
  const shouldGenerate = await shouldGenerateDailyMissions();
  
  if (!shouldGenerate) {
    console.log('Daily missions already generated or not generation time');
    return null;
  }
  
  const input: DailyMissionGenerationInput = {
    date: new Date(),
    targetMissionCount: 3,
    includeReactions: true,
  };
  
  return generateDailyMissions(input);
}

/**
 * Approve daily mission
 */
export async function approveDailyMission(
  missionId: string
): Promise<boolean> {
  const supabase = getServiceSupabase();
  
  const { error } = await supabase
    .from('ops_daily_missions')
    .update({
      status: 'approved',
    })
    .eq('id', missionId);
  
  if (error) {
    console.error('Error approving daily mission:', error);
    return false;
  }
  
  return true;
}

/**
 * Schedule daily mission (create calendar events)
 */
export async function scheduleDailyMission(
  missionId: string
): Promise<boolean> {
  const supabase = getServiceSupabase();
  
  // Get mission details
  const { data: mission } = await supabase
    .from('ops_daily_missions')
    .select('*')
    .eq('id', missionId)
    .single();
  
  if (!mission) {
    return false;
  }
  
  // Get proposals
  const proposalIds = [
    mission.primary_mission_id,
    mission.secondary_mission_id,
    mission.tertiary_mission_id,
  ].filter(Boolean);
  
  const { data: proposals } = await supabase
    .from('ops_mission_proposals')
    .select('*')
    .in('id', proposalIds);
  
  if (!proposals) {
    return false;
  }
  
  // Approve all proposals
  for (const proposal of proposals) {
    await supabase
      .from('ops_mission_proposals')
      .update({
        status: 'approved',
        approved_at: new Date().toISOString(),
      })
      .eq('id', proposal.id);
  }
  
  // Update mission status
  await supabase
    .from('ops_daily_missions')
    .update({
      status: 'scheduled',
    })
    .eq('id', missionId);
  
  // TODO: Sync with Google Calendar (Phase 10.3)
  
  return true;
}

/**
 * Complete daily mission
 */
export async function completeDailyMission(
  missionId: string,
  rating?: number,
  notes?: string
): Promise<boolean> {
  const supabase = getServiceSupabase();
  
  const { error } = await supabase
    .from('ops_daily_missions')
    .update({
      status: 'completed',
      completed_at: new Date().toISOString(),
      completion_rating: rating || null,
      completion_notes: notes || null,
    })
    .eq('id', missionId);
  
  if (error) {
    console.error('Error completing daily mission:', error);
    return false;
  }
  
  return true;
}