import React, { createContext, useContext, useEffect, useState } from 'react';
import { useAuth } from './AuthContext';
import { Employee, EmployeeReport, Submission, CompanyReport } from '../types';
import { SAMPLE_COMPANY_REPORT, API_URL } from '../constants';
import { apiPost, apiPut } from '../services/api';
import { User } from 'firebase/auth';
import { EmployeeSubmissionAnswers } from '../employeeQuestions';
import { secureApi } from '../services/secureApi';

interface OrgData {
    orgId: string;
    companyName?: string;
    onboardingData?: Record<string, any>;
    companyLogo?: string;
    updatedAt?: number;
    onboardingCompleted?: boolean;
}

interface OrgContextType {
    org: OrgData | null;
    user?: User;
    orgId: string;
    employees: Employee[];
    submissions: Record<string, Submission>;
    reports: Record<string, EmployeeReport>;
    loading: boolean;
    upsertOrg: (data: Partial<OrgData>) => Promise<void>;
    saveReport: (employeeId: string, report: EmployeeReport) => Promise<void>;
    inviteEmployee: (args: { name: string; email: string }) => Promise<{ employeeId: string; inviteLink: string }>;
    issueInviteViaApi: (args: { name: string; email: string; role?: string; department?: string }) => Promise<{ code: string; inviteLink: string; employee: any }>;
    getInviteStatus: (code: string) => Promise<{ used: boolean; employee: any } | null>;
    consumeInvite: (code: string) => Promise<{ employee: any; orgId?: string } | null>;
    getReportVersions: (employeeId: string) => Promise<Array<{ id: string; createdAt: number; report: EmployeeReport }>>;
    saveReportVersion: (employeeId: string, report: EmployeeReport) => Promise<void>;
    acceptInvite: (code: string) => Promise<void>;
    saveCompanyReport: (summary: string) => Promise<void>;
    getCompanyReportHistory: () => Promise<Array<{ id: string; createdAt: number; summary: string }>>;
    saveFullCompanyReport: (report: CompanyReport) => Promise<void>;
    getFullCompanyReportHistory: () => Promise<CompanyReport[]>;
    generateCompanyReport: () => Promise<CompanyReport>;
    generateCompanyWiki: (orgOverride?: OrgData) => Promise<CompanyReport>;
    seedInitialData: () => Promise<void>;
    isOwner: (employeeId?: string) => boolean;
    submitEmployeeAnswers: (employeeId: string, answers: Record<string, string>) => Promise<any>;
    generateEmployeeReport: (employee: Employee) => Promise<EmployeeReport | null>;
    getEmployeeReport: (employeeId: string) => Promise<{ success: boolean; report?: EmployeeReport; error?: string }>;
    getEmployeeReports: () => Promise<{ success: boolean; reports?: EmployeeReport[]; error?: string }>;
}

const OrgContext = createContext<OrgContextType | undefined>(undefined);

export const OrgProvider: React.FC<{ children: React.ReactNode; selectedOrgId: string }> = ({ children, selectedOrgId }) => {
    const { user } = useAuth();
    const [org, setOrg] = useState<OrgData | null>(null);
    const [employees, setEmployees] = useState<Employee[]>([]);
    const [submissions, setSubmissions] = useState<Record<string, Submission>>({});
    const [reports, setReports] = useState<Record<string, EmployeeReport>>({});
    const [reportVersions, setReportVersions] = useState<Record<string, Array<{ id: string; createdAt: number; report: EmployeeReport }>>>({});
    const [companyReports, setCompanyReports] = useState<Array<{ id: string; createdAt: number; summary: string }>>([]);
    const [fullCompanyReports, setFullCompanyReports] = useState<CompanyReport[]>([]);
    const [loading, setLoading] = useState(true);

    // Use the provided selectedOrgId instead of deriving from user
    const orgId = selectedOrgId;

    // Load initial data using secure API
    useEffect(() => {
        if (!orgId || !user?.uid) {
            setLoading(false);
            return;
        }

        console.log('OrgContext: Loading data via secure API for orgId:', orgId);

        const loadOrgData = async () => {
            try {
                setLoading(true);

                // Load organization data
                try {
                    const orgData = await secureApi.getOrgData();
                    setOrg({ orgId, ...orgData });
                } catch (error) {
                    console.warn('Could not load org data, creating default:', error);
                    // Create default org if not found
                    const defaultOrg = { name: 'Your Company', onboardingCompleted: false };
                    await secureApi.updateOrgData(defaultOrg);
                    setOrg({ orgId, ...defaultOrg });
                }

                // Load employees
                try {
                    const employeesData = await secureApi.getEmployees();
                    setEmployees(employeesData.map(emp => ({
                        ...emp,
                        initials: emp.name ? emp.name.split(' ').map(n => n[0]).join('').toUpperCase() : emp.email?.substring(0, 2).toUpperCase() || 'U'
                    })));
                } catch (error) {
                    console.warn('Could not load employees:', error);
                    setEmployees([]);
                }

                // Load submissions
                try {
                    const submissionsData = await secureApi.getSubmissions();
                    setSubmissions(submissionsData);
                } catch (error) {
                    console.warn('Could not load submissions:', error);
                    setSubmissions({});
                }

                // Load reports
                try {
                    const reportsData = await secureApi.getReports();
                    setReports(reportsData as Record<string, EmployeeReport>);
                } catch (error) {
                    console.warn('Could not load reports:', error);
                    setReports({});
                }

                // Load company reports
                try {
                    const companyReportsData = await secureApi.getCompanyReports();
                    setFullCompanyReports(companyReportsData);
                } catch (error) {
                    console.warn('Could not load company reports:', error);
                    setFullCompanyReports([]);
                }

            } catch (error) {
                console.error('Failed to load org data:', error);
            } finally {
                setLoading(false);
            }
        };

        loadOrgData();
    }, [orgId, user?.uid]);

    const upsertOrg = async (data: Partial<OrgData>) => {
        if (!user?.uid) {
            throw new Error('User authentication required');
        }

        try {
            await secureApi.updateOrgData(data);

            // Update local state
            const updatedOrg = { ...(org || { orgId, name: 'Your Company' }), ...data } as OrgData;
            setOrg(updatedOrg);

            // If onboarding was completed, notify other contexts
            if (data.onboardingCompleted) {
                console.log('OrgContext: Onboarding completed, dispatching update event', {
                    orgId: updatedOrg.orgId,
                    onboardingCompleted: true
                });

                window.dispatchEvent(new CustomEvent('organizationUpdated', {
                    detail: { orgId: updatedOrg.orgId, onboardingCompleted: true }
                }));
            }
        } catch (error) {
            console.error('Failed to update organization:', error);
            throw error;
        }
    };

    const saveReport = async (employeeId: string, report: EmployeeReport) => {
        if (!user?.uid) {
            throw new Error('User authentication required');
        }

        try {
            const savedReport = await secureApi.saveReport(employeeId, report);

            // Update local state
            setReports(prev => ({ ...prev, [employeeId]: savedReport }));
        } catch (error) {
            console.error('Failed to save report:', error);
            throw error;
        }
    };

    const inviteEmployee = async ({ name, email, role, department }: { name: string; email: string, role?: string, department?: string }) => {
        console.log('inviteEmployee called:', { name, email, orgId });

        try {
            // Use secure API for invites
            const data = await secureApi.createInvitation({ name, email, role, department });

            console.log('Invite created successfully:', { code: data.code, employee: data.employee.name, inviteLink: data.inviteLink });

            // Store employee locally for immediate UI update with proper typing
            const newEmployee: Employee = {
                id: data.employee.id,
                name: data.employee.name,
                email: data.employee.email,
                initials: data.employee.name ? data.employee.name.split(' ').map(n => n[0]).join('').toUpperCase() : data.employee.email.substring(0, 2).toUpperCase(),
                department: data.employee.department,
                role: data.employee.role,
                isOwner: false,
                status: data.employee.status
            };

            // Add to local state for immediate UI update
            setEmployees(prev => {
                if (prev.find(e => e.id === data.employee.id)) return prev;
                return [...prev, newEmployee];
            });

            return { employeeId: data.employee.id, inviteLink: data.inviteLink };
        } catch (error) {
            console.error('inviteEmployee error:', error);
            throw error;
        }
    };

    const getReportVersions = async (employeeId: string) => {
        // This feature is not yet implemented in secure API
        // Return empty array for now until we add version support to cloud functions
        console.warn('Report versions not yet supported in secure API');
        return [];
    };

    const saveReportVersion = async (employeeId: string, report: EmployeeReport) => {
        // This feature is not yet implemented in secure API
        console.warn('Report versions not yet supported in secure API');
        const version = { id: Date.now().toString(), createdAt: Date.now(), report };
        setReportVersions(prev => ({ ...prev, [employeeId]: [version, ...(prev[employeeId] || [])] }));
    };

    const acceptInvite = async (code: string) => {
        if (!code || !user?.uid) return;

        try {
            await secureApi.consumeInvitation(code, user.uid);
        } catch (error) {
            console.error('Failed to accept invite:', error);
            throw error;
        }
    };

    const saveCompanyReport = async (summary: string) => {
        if (!user?.uid) {
            throw new Error('User authentication required');
        }

        try {
            const report = {
                id: Date.now().toString(),
                createdAt: Date.now(),
                summary
            };

            await secureApi.saveCompanyReport(report);

            // Update local state
            setCompanyReports(prev => [{ id: report.id, createdAt: report.createdAt, summary }, ...prev]);
        } catch (error) {
            console.error('Failed to save company report:', error);
            throw error;
        }
    };

    const getCompanyReportHistory = async () => {
        if (!user?.uid) {
            throw new Error('User authentication required');
        }

        try {
            const reports = await secureApi.getCompanyReports();
            return reports.map(report => ({
                id: report.id,
                createdAt: report.createdAt || 0,
                summary: report.executiveSummary || ''
            })).sort((a, b) => b.createdAt - a.createdAt);
        } catch (error) {
            console.error('Failed to get company report history:', error);
            return [];
        }
    };

    const seedInitialData = async () => {
        // Start with clean slate - let users invite their own employees and generate real data
        setEmployees([]);
        setSubmissions({});
        setReports({});
        setFullCompanyReports([]);
    };

    const saveFullCompanyReport = async (report: CompanyReport) => {
        if (!orgId) {
            console.error('Cannot save company report: orgId is undefined');
            throw new Error('Organization ID is required to save company report');
        }

        if (!user?.uid) {
            throw new Error('User authentication required');
        }

        try {
            await secureApi.saveCompanyReport(report);

            // Update local state after successful save
            setFullCompanyReports(prev => [report, ...prev]);
        } catch (error) {
            console.error('Failed to save full company report:', error);
            throw error;
        }
    };

    const getFullCompanyReportHistory = async (): Promise<CompanyReport[]> => {
        if (!user?.uid) {
            throw new Error('User authentication required');
        }

        try {
            const reports = await secureApi.getCompanyReports();
            return reports.sort((a, b) => (b.createdAt || 0) - (a.createdAt || 0));
        } catch (error) {
            console.error('Failed to get full company report history:', error);
            return [];
        }
    };

    const generateCompanyReport = async (): Promise<CompanyReport> => {
        console.log('generateCompanyReport called for org:', orgId);

        if (!user?.uid) {
            throw new Error('User authentication required');
        }

        // Calculate concrete metrics from actual data (no AI needed)
        // Exclude owners from employee counts - they are company wiki contributors, not employees
        const actualEmployees = employees.filter(emp => !emp.isOwner);
        const totalEmployees = actualEmployees.length;

        // Only count submissions from non-owner employees
        const employeeSubmissions = Object.fromEntries(
            Object.entries(submissions).filter(([employeeId]) => {
                const employee = employees.find(emp => emp.id === employeeId);
                return employee && !employee.isOwner;
            })
        );
        const submittedEmployees = Object.keys(employeeSubmissions).length;
        const submissionRate = totalEmployees > 0 ? (submittedEmployees / totalEmployees) * 100 : 0;

        // Department breakdown (concrete data) - exclude owners
        const deptMap = new Map<string, number>();
        actualEmployees.forEach(emp => {
            const dept = emp.department || 'Unassigned';
            deptMap.set(dept, (deptMap.get(dept) || 0) + 1);
        });
        const departmentBreakdown = Array.from(deptMap.entries()).map(([department, count]) => ({ department, count }));

        try {
            // Use secure API for AI generation
            const data = await secureApi.generateCompanyWiki({
                ...org,
                metrics: {
                    totalEmployees,
                    submissionRate,
                    departmentBreakdown
                }
            }, Object.values(employeeSubmissions));

            console.log('Company insights generated via AI successfully');

            // Combine concrete metrics with AI insights
            const report: CompanyReport = {
                id: Date.now().toString(),
                createdAt: Date.now(),
                // Use AI-generated insights for subjective analysis
                ...(data as any),
                // Override with our concrete metrics
                overview: {
                    totalEmployees,
                    departmentBreakdown,
                    submissionRate,
                    lastUpdated: Date.now(),
                    averagePerformanceScore: (data as any)?.overview?.averagePerformanceScore || 0,
                    riskLevel: (data as any)?.overview?.riskLevel || 'Unknown'
                }
            };

            console.log('Final company report object:', report);
            await saveFullCompanyReport(report);
            return report;
        } catch (error) {
            console.error('generateCompanyReport error:', error);
            throw error;
        }
    };

    const generateCompanyWiki = async (orgOverride?: OrgData): Promise<CompanyReport> => {
        const orgData = orgOverride || org;
        console.log('generateCompanyWiki called with:', { orgData, orgId, submissionsCount: Object.keys(submissions || {}).length });

        if (!orgId) {
            throw new Error('Organization ID is required to generate company wiki');
        }

        if (!user?.uid) {
            throw new Error('User authentication required');
        }

        // Use secure API for wiki generation
        try {
            console.log('Making API call to generateCompanyWiki...');
            const payload = await secureApi.generateCompanyWiki(orgData, Object.values(submissions || {}));

            console.log('API success response:', payload);

            // Ensure the report has all required fields to prevent undefined errors
            const data: CompanyReport = {
                id: Date.now().toString(),
                createdAt: Date.now(),
                overview: {
                    totalEmployees: employees.length,
                    departmentBreakdown: [],
                    submissionRate: 0,
                    lastUpdated: Date.now(),
                    averagePerformanceScore: 0,
                    riskLevel: 'Unknown'
                },
                gradingBreakdown: [],
                personnelChanges: { newHires: [], promotions: [], departures: [] },
                immediateHiringNeeds: [],
                forwardOperatingPlan: { quarterlyGoals: [], resourceNeeds: [], riskMitigation: [] },
                executiveSummary: 'Company report generated successfully.',
                // Override with API data if available
                ...(payload as any || {})
            };

            await saveFullCompanyReport(data);
            return data;
        } catch (e) {
            console.error('generateCompanyWiki error, falling back to local synthetic:', e);
            return generateCompanyReport();
        }
    };

    const isOwner = (employeeId?: string): boolean => {
        const currentEmployee = employeeId ? employees.find(e => e.id === employeeId) :
            employees.find(e => e.email === user?.email);
        return currentEmployee?.isOwner === true;
    };

    const getEmployeeReport = async (employeeId: string) => {
        try {
            if (!user?.uid) {
                throw new Error('User authentication required');
            }

            // Use secure API for all employee report operations
            const report = await secureApi.getReports();
            const employeeReport = report[employeeId];

            if (employeeReport) {
                return { success: true, report: employeeReport };
            }
            return { success: false, error: 'Report not found' };
        } catch (error) {
            console.error('Error fetching employee report:', error);
            return { success: false, error: (error as Error).message };
        }
    };

    const getEmployeeReports = async () => {
        try {
            if (!user?.uid) {
                throw new Error('User authentication required');
            }

            // Use secure API for all employee report operations
            const reportsData = await secureApi.getReports();
            const reports = Object.values(reportsData);
            return { success: true, reports };
        } catch (error) {
            console.error('Error fetching employee reports:', error);
            return { success: false, error: (error as Error).message };
        }
    };

    const value = {
        org,
        orgId,
        employees,
        submissions,
        reports,
        loading,
        upsertOrg,
        saveReport,
        inviteEmployee,
        getReportVersions,
        saveReportVersion,
        acceptInvite,
        saveCompanyReport,
        getCompanyReportHistory,
        saveFullCompanyReport,
        getFullCompanyReportHistory,
        generateCompanyReport,
        generateCompanyWiki,
        seedInitialData,
        isOwner,
        issueInviteViaApi: async ({ name, email, role, department }) => {
            try {
                if (!user?.uid) {
                    throw new Error('User authentication required');
                }

                const data = await secureApi.createInvitation({ name, email, role, department });

                // Optimistically add employee shell (not yet active until consume)
                setEmployees(prev => prev.find(e => e.id === data.employee.id) ? prev : [...prev, {
                    ...data.employee,
                    initials: data.employee.name ? data.employee.name.split(' ').map((n: string) => n[0]).join('').toUpperCase() : data.employee.email.substring(0, 2).toUpperCase()
                } as Employee]);
                return data;
            } catch (e) {
                console.error('issueInviteViaApi error', e);
                throw e;
            }
        },
        getInviteStatus: async (code: string) => {
            try {
                return await secureApi.getInvitationStatus(code);
            } catch (e) {
                console.error('getInviteStatus error', e);
                return null;
            }
        },
        consumeInvite: async (code: string) => {
            try {
                if (!user?.uid) {
                    throw new Error('User authentication required');
                }

                const result = await secureApi.consumeInvitation(code, user.uid);

                // Mark employee as active
                if (result && (result as any).employee) {
                    setEmployees(prev => prev.find(e => e.id === (result as any).employee.id) ? prev : [...prev, (result as any).employee]);
                    return { ...(result as any), orgId: org?.orgId };
                }
                return null;
            } catch (e) {
                console.error('consumeInvite error', e);
                return null;
            }
        },
        submitEmployeeAnswers: async (employeeId: string, answers: Record<string, string>) => {
            try {
                // Use secure API for submission
                await secureApi.submitEmployeeAnswers(employeeId, answers);

                // Update local state for immediate UI feedback
                const convertedSubmission: Submission = {
                    employeeId,
                    answers: Object.entries(answers).map(([question, answer]) => ({
                        question,
                        answer
                    }))
                };
                setSubmissions(prev => ({ ...prev, [employeeId]: convertedSubmission }));
                return true;
            } catch (e) {
                console.error('submitEmployeeAnswers error', e);
                return false;
            }
        },
        generateEmployeeReport: async (employee: Employee) => {
            try {
                console.log('generateEmployeeReport called for:', employee.name, 'in org:', orgId);

                if (!user?.uid) {
                    throw new Error('User authentication required');
                }

                // Get submission data for this employee
                const submission = submissions[employee.id];
                if (!submission) {
                    throw new Error(`No questionnaire submission found for ${employee.name}. Please ensure they have completed the employee questionnaire first.`);
                }

                // Convert submission format for API
                let submissionAnswers: Record<string, string> = {};
                if (submission.answers) {
                    if (Array.isArray(submission.answers)) {
                        // If answers is an array of {question, answer} objects
                        submissionAnswers = submission.answers.reduce((acc, item: any) => {
                            acc[item.question] = item.answer;
                            return acc;
                        }, {} as Record<string, string>);
                    } else {
                        // If answers is already a key-value object
                        submissionAnswers = submission.answers as Record<string, string>;
                    }
                }

                console.log('Submission data found:', Object.keys(submissionAnswers).length, 'answers');

                // Get company report and wiki data for context
                let companyWiki = null;
                try {
                    const companyReports = await getFullCompanyReportHistory();
                    if (companyReports.length > 0) {
                        companyWiki = {
                            org: org,
                            companyReport: companyReports[0]
                        };
                        console.log('Including company context in employee report generation');
                    }
                } catch (error) {
                    console.warn('Could not fetch company report for context:', error);
                }

                const data = await secureApi.generateEmployeeReport(employee, submissionAnswers, companyWiki);

                if ((data as any).report) {
                    console.log('Employee report generated successfully');
                    const report = (data as any).report as EmployeeReport;
                    setReports(prev => ({ ...prev, [employee.id]: report }));
                    return report;
                } else {
                    throw new Error('No report data received from API');
                }
            } catch (e) {
                console.error('generateEmployeeReport error', e);
                throw e; // Re-throw to allow caller to handle
            }
        },
        getEmployeeReport,
        getEmployeeReports,
    };

    return (
        <OrgContext.Provider value={value}>
            {children}
        </OrgContext.Provider>
    );
};

export const useOrg = () => {
    const ctx = useContext(OrgContext);
    if (!ctx) throw new Error('useOrg must be used within OrgProvider');
    return ctx;
};