import { Controller, Post, Body, Headers, Req, Logger, HttpException } from '@nestjs/common';
import type { Request } from 'express';
import { ConfigService } from '@nestjs/config';
import axios from 'axios';
import { OzonetelAgentService } from '../ozonetel/ozonetel-agent.service';
import { SessionService } from './session.service';
import { AgentConfigService } from './agent-config.service';
import { TelephonyConfigService } from '../config/telephony-config.service';

@Controller('auth')
export class AuthController {
    private readonly logger = new Logger(AuthController.name);
    private readonly graphqlUrl: string;
    private readonly workspaceSubdomain: string;
    private readonly origin: string;

    constructor(
        private config: ConfigService,
        private ozonetelAgent: OzonetelAgentService,
        private sessionService: SessionService,
        private agentConfigService: AgentConfigService,
        private telephony: TelephonyConfigService,
    ) {
        this.graphqlUrl = config.get<string>('platform.graphqlUrl')!;
        this.workspaceSubdomain = process.env.PLATFORM_WORKSPACE_SUBDOMAIN ?? 'fortytwo-dev';
        this.origin = process.env.PLATFORM_ORIGIN ?? 'http://fortytwo-dev.localhost:4010';
    }

    @Post('login')
    async login(@Body() body: { email: string; password: string }, @Req() req: Request) {
        this.logger.log(`Login attempt for ${body.email}`);

        try {
            // Step 1: Get login token
            const loginRes = await axios.post(this.graphqlUrl, {
                query: `mutation GetLoginToken($email: String!, $password: String!) {
                    getLoginTokenFromCredentials(
                        email: $email
                        password: $password
                        origin: "${this.origin}"
                    ) {
                        loginToken { token }
                    }
                }`,
                variables: { email: body.email, password: body.password },
            }, {
                headers: {
                    'Content-Type': 'application/json',
                    'X-Workspace-Subdomain': this.workspaceSubdomain,
                },
            });

            if (loginRes.data.errors) {
                throw new HttpException(
                    loginRes.data.errors[0]?.message ?? 'Login failed',
                    401,
                );
            }

            const loginToken = loginRes.data.data.getLoginTokenFromCredentials.loginToken.token;

            // Step 2: Exchange for access + refresh tokens
            const tokenRes = await axios.post(this.graphqlUrl, {
                query: `mutation GetAuthTokens($loginToken: String!) {
                    getAuthTokensFromLoginToken(
                        loginToken: $loginToken
                        origin: "${this.origin}"
                    ) {
                        tokens {
                            accessOrWorkspaceAgnosticToken { token }
                            refreshToken { token }
                        }
                    }
                }`,
                variables: { loginToken },
            }, {
                headers: {
                    'Content-Type': 'application/json',
                    'X-Workspace-Subdomain': this.workspaceSubdomain,
                },
            });

            if (tokenRes.data.errors) {
                throw new HttpException(
                    tokenRes.data.errors[0]?.message ?? 'Token exchange failed',
                    401,
                );
            }

            const tokens = tokenRes.data.data.getAuthTokensFromLoginToken.tokens;
            const accessToken = tokens.accessOrWorkspaceAgnosticToken.token;

            // Step 3: Fetch user profile with roles
            const profileRes = await axios.post(this.graphqlUrl, {
                query: `{ currentUser { id email workspaceMember { id name { firstName lastName } userEmail avatarUrl roles { id label } } } }`,
            }, {
                headers: {
                    'Content-Type': 'application/json',
                    'Authorization': `Bearer ${accessToken}`,
                },
            });

            const currentUser = profileRes.data?.data?.currentUser;
            const workspaceMember = currentUser?.workspaceMember;
            const roles = workspaceMember?.roles ?? [];
            const roleLabels = roles.map((r: any) => r.label);

            // Determine app role from platform roles
            let appRole = 'executive'; // default
            if (roleLabels.includes('HelixEngage Manager') || roleLabels.includes('HelixEngage Supervisor')) {
                appRole = 'admin';
            } else if (roleLabels.includes('HelixEngage User')) {
                const email = workspaceMember?.userEmail ?? body.email;
                appRole = email.includes('cc') ? 'cc-agent' : 'executive';
            }

            this.logger.log(`User ${body.email} logged in with role: ${appRole} (platform roles: ${roleLabels.join(', ')})`);

            // Check if user has an Agent entity with SIP config — applies to ALL roles
            let agentConfigResponse: any = undefined;
            const memberId = workspaceMember?.id;

            if (memberId) {
                const agentConfig = await this.agentConfigService.getByMemberId(memberId);

                if (agentConfig) {
                    // Agent entity found — set up SIP + Ozonetel
                    const clientIp = (req.headers['x-forwarded-for'] as string)?.split(',')[0]?.trim() ?? req.ip ?? 'unknown';
                    const existingSession = await this.sessionService.getSession(agentConfig.ozonetelAgentId);
                    if (existingSession) {
                        this.logger.warn(`Duplicate login blocked for ${body.email} — session held by IP ${existingSession.ip} since ${existingSession.lockedAt}`);
                        throw new HttpException(`You are already logged in from another device (${existingSession.ip}). Please log out there first.`, 409);
                    }

                    await this.sessionService.lockSession(agentConfig.ozonetelAgentId, memberId, clientIp);

                    this.ozonetelAgent.refreshToken().catch(err => {
                        this.logger.warn(`Ozonetel token refresh on login failed: ${err.message}`);
                    });

                    const ozAgentPassword = this.telephony.getConfig().ozonetel.agentPassword || 'Test123$';
                    this.ozonetelAgent.loginAgent({
                        agentId: agentConfig.ozonetelAgentId,
                        password: ozAgentPassword,
                        phoneNumber: agentConfig.sipExtension,
                        mode: 'blended',
                    }).catch(err => {
                        this.logger.warn(`Ozonetel agent login failed (non-blocking): ${err.message}`);
                    });

                    agentConfigResponse = {
                        ozonetelAgentId: agentConfig.ozonetelAgentId,
                        sipExtension: agentConfig.sipExtension,
                        sipPassword: agentConfig.sipPassword,
                        sipUri: agentConfig.sipUri,
                        sipWsServer: agentConfig.sipWsServer,
                        campaignName: agentConfig.campaignName,
                    };

                    this.logger.log(`Agent ${body.email} → Ozonetel ${agentConfig.ozonetelAgentId} / SIP ${agentConfig.sipExtension}`);
                } else if (appRole === 'cc-agent') {
                    // CC agent role but no Agent entity — block login
                    throw new HttpException('Agent account not configured. Contact administrator.', 403);
                } else {
                    this.logger.log(`User ${body.email} has no Agent entity — SIP disabled`);
                }
            }

            // Cache agent name for worklist resolution (avoids re-querying currentUser with user JWT)
            const agentFullName = `${workspaceMember?.name?.firstName ?? ''} ${workspaceMember?.name?.lastName ?? ''}`.trim();
            if (agentFullName) {
                await this.sessionService.setCache(`agent:name:${accessToken.slice(-16)}`, agentFullName, 86400);
            }

            return {
                accessToken,
                refreshToken: tokens.refreshToken.token,
                user: {
                    id: currentUser?.id,
                    email: currentUser?.email,
                    firstName: workspaceMember?.name?.firstName ?? '',
                    lastName: workspaceMember?.name?.lastName ?? '',
                    avatarUrl: workspaceMember?.avatarUrl,
                    role: appRole,
                    platformRoles: roleLabels,
                },
                ...(agentConfigResponse ? { agentConfig: agentConfigResponse } : {}),
            };
        } catch (error) {
            if (error instanceof HttpException) throw error;
            this.logger.error(`Login proxy failed: ${error}`);
            throw new HttpException('Authentication service unavailable', 503);
        }
    }

    @Post('refresh')
    async refresh(@Body() body: { refreshToken: string }) {
        if (!body.refreshToken) {
            throw new HttpException('refreshToken required', 400);
        }

        this.logger.log('Token refresh request');

        try {
            const res = await axios.post(this.graphqlUrl, {
                query: `mutation RefreshToken($token: String!) {
                    renewToken(appToken: $token) {
                        tokens {
                            accessOrWorkspaceAgnosticToken { token expiresAt }
                            refreshToken { token }
                        }
                    }
                }`,
                variables: { token: body.refreshToken },
            }, {
                headers: { 'Content-Type': 'application/json' },
            });

            if (res.data.errors) {
                this.logger.warn(`Token refresh failed: ${res.data.errors[0]?.message}`);
                throw new HttpException('Token refresh failed', 401);
            }

            const tokens = res.data.data.renewToken.tokens;
            return {
                accessToken: tokens.accessOrWorkspaceAgnosticToken.token,
                refreshToken: tokens.refreshToken.token,
            };
        } catch (error) {
            if (error instanceof HttpException) throw error;
            this.logger.error(`Token refresh failed: ${error}`);
            throw new HttpException('Token refresh failed', 401);
        }
    }

    @Post('logout')
    async logout(@Headers('authorization') auth: string) {
        if (!auth) return { status: 'ok' };

        try {
            const profileRes = await axios.post(this.graphqlUrl, {
                query: '{ currentUser { workspaceMember { id } } }',
            }, { headers: { 'Content-Type': 'application/json', Authorization: auth } });

            const memberId = profileRes.data?.data?.currentUser?.workspaceMember?.id;
            if (!memberId) return { status: 'ok' };

            const agentConfig = this.agentConfigService.getFromCache(memberId);
            if (agentConfig) {
                await this.sessionService.unlockSession(agentConfig.ozonetelAgentId);
                this.logger.log(`Session unlocked for ${agentConfig.ozonetelAgentId}`);

                this.ozonetelAgent.logoutAgent({
                    agentId: agentConfig.ozonetelAgentId,
                    password: this.telephony.getConfig().ozonetel.agentPassword || 'Test123$',
                }).catch(err => this.logger.warn(`Ozonetel logout failed: ${err.message}`));

                this.agentConfigService.clearCache(memberId);
            }

            return { status: 'ok' };
        } catch (err) {
            this.logger.warn(`Logout cleanup failed: ${err}`);
            return { status: 'ok' };
        }
    }

    @Post('heartbeat')
    async heartbeat(@Headers('authorization') auth: string) {
        if (!auth) return { status: 'ok' };

        try {
            const profileRes = await axios.post(this.graphqlUrl, {
                query: '{ currentUser { workspaceMember { id } } }',
            }, { headers: { 'Content-Type': 'application/json', Authorization: auth } });

            const memberId = profileRes.data?.data?.currentUser?.workspaceMember?.id;
            const agentConfig = memberId ? this.agentConfigService.getFromCache(memberId) : null;

            if (agentConfig) {
                await this.sessionService.refreshSession(agentConfig.ozonetelAgentId);
            }

            return { status: 'ok' };
        } catch {
            return { status: 'ok' };
        }
    }
}