use chrono::Utc;
use compliance_core::error::CoreError;
use compliance_core::models::dast::{
    DastFinding, DastScanPhase, DastScanRun, DastScanStatus, DastTarget,
};
use compliance_core::traits::dast_agent::DastContext;
use tracing::{error, info};

use crate::crawler::WebCrawler;
use crate::recon::ReconAgent;

/// State machine orchestrator for DAST scanning
pub struct DastOrchestrator {
    http: reqwest::Client,
    rate_limit_ms: u64,
}

impl DastOrchestrator {
    pub fn new(rate_limit_ms: u64) -> Self {
        Self {
            http: reqwest::Client::new(),
            rate_limit_ms,
        }
    }

    /// Run a complete DAST scan against a target
    pub async fn run_scan(
        &self,
        target: &DastTarget,
        sast_hints: Vec<String>,
    ) -> Result<(DastScanRun, Vec<DastFinding>), CoreError> {
        let target_id = target
            .id
            .map(|oid| oid.to_hex())
            .unwrap_or_else(|| "unknown".to_string());

        let mut scan_run = DastScanRun::new(target_id);
        let mut all_findings = Vec::new();

        info!(target = %target.base_url, "Starting DAST scan");

        // Phase 1: Reconnaissance
        scan_run.current_phase = DastScanPhase::Reconnaissance;
        let recon = ReconAgent::new(self.http.clone());
        let recon_result = match recon.scan(&target.base_url).await {
            Ok(r) => r,
            Err(e) => {
                error!(error = %e, "Reconnaissance failed");
                scan_run.status = DastScanStatus::Failed;
                scan_run.error_message = Some(format!("Reconnaissance failed: {e}"));
                scan_run.completed_at = Some(Utc::now());
                return Ok((scan_run, all_findings));
            }
        };
        scan_run
            .phases_completed
            .push(DastScanPhase::Reconnaissance);

        info!(
            technologies = ?recon_result.technologies,
            headers = recon_result.interesting_headers.len(),
            "Reconnaissance complete"
        );

        // Phase 2: Crawling
        scan_run.current_phase = DastScanPhase::Crawling;
        let crawler = WebCrawler::new(
            self.http.clone(),
            target.max_crawl_depth,
            self.rate_limit_ms,
        );
        let endpoints = match crawler
            .crawl(&target.base_url, &target.excluded_paths)
            .await
        {
            Ok(e) => e,
            Err(e) => {
                error!(error = %e, "Crawling failed");
                scan_run.status = DastScanStatus::Failed;
                scan_run.error_message = Some(format!("Crawling failed: {e}"));
                scan_run.completed_at = Some(Utc::now());
                return Ok((scan_run, all_findings));
            }
        };
        scan_run.endpoints_discovered = endpoints.len() as u32;
        scan_run.phases_completed.push(DastScanPhase::Crawling);

        info!(endpoints = endpoints.len(), "Crawling complete");

        // Build context for vulnerability agents
        let context = DastContext {
            endpoints,
            technologies: recon_result.technologies,
            sast_hints,
        };

        // Phase 3: Vulnerability Analysis
        scan_run.current_phase = DastScanPhase::VulnerabilityAnalysis;
        let vuln_findings = self.run_vulnerability_agents(target, &context).await?;
        all_findings.extend(vuln_findings);
        scan_run
            .phases_completed
            .push(DastScanPhase::VulnerabilityAnalysis);

        // Phase 4: Exploitation (verify findings)
        scan_run.current_phase = DastScanPhase::Exploitation;
        // Exploitation is handled within each agent's evidence collection
        scan_run.phases_completed.push(DastScanPhase::Exploitation);

        // Phase 5: Reporting
        scan_run.current_phase = DastScanPhase::Reporting;
        scan_run.findings_count = all_findings.len() as u32;
        scan_run.exploitable_count = all_findings.iter().filter(|f| f.exploitable).count() as u32;
        scan_run.phases_completed.push(DastScanPhase::Reporting);

        scan_run.status = DastScanStatus::Completed;
        scan_run.current_phase = DastScanPhase::Completed;
        scan_run.completed_at = Some(Utc::now());

        info!(
            findings = scan_run.findings_count,
            exploitable = scan_run.exploitable_count,
            "DAST scan complete"
        );

        Ok((scan_run, all_findings))
    }

    /// Run all vulnerability testing agents in parallel
    async fn run_vulnerability_agents(
        &self,
        target: &DastTarget,
        context: &DastContext,
    ) -> Result<Vec<DastFinding>, CoreError> {
        use compliance_core::traits::DastAgent;

        let http = self.http.clone();

        // Spawn each agent as a separate tokio task
        let t1 = target.clone();
        let c1 = context.clone();
        let h1 = http.clone();
        let sqli_handle = tokio::spawn(async move {
            crate::agents::injection::SqlInjectionAgent::new(h1)
                .run(&t1, &c1)
                .await
        });

        let t2 = target.clone();
        let c2 = context.clone();
        let h2 = http.clone();
        let xss_handle =
            tokio::spawn(async move { crate::agents::xss::XssAgent::new(h2).run(&t2, &c2).await });

        let t3 = target.clone();
        let c3 = context.clone();
        let h3 = http.clone();
        let auth_handle = tokio::spawn(async move {
            crate::agents::auth_bypass::AuthBypassAgent::new(h3)
                .run(&t3, &c3)
                .await
        });

        let t4 = target.clone();
        let c4 = context.clone();
        let h4 = http.clone();
        let ssrf_handle =
            tokio::spawn(
                async move { crate::agents::ssrf::SsrfAgent::new(h4).run(&t4, &c4).await },
            );

        let t5 = target.clone();
        let c5 = context.clone();
        let h5 = http;
        let api_handle = tokio::spawn(async move {
            crate::agents::api_fuzzer::ApiFuzzerAgent::new(h5)
                .run(&t5, &c5)
                .await
        });

        let handles: Vec<tokio::task::JoinHandle<Result<Vec<DastFinding>, CoreError>>> = vec![
            sqli_handle,
            xss_handle,
            auth_handle,
            ssrf_handle,
            api_handle,
        ];

        let mut all_findings = Vec::new();
        for handle in handles {
            match handle.await {
                Ok(Ok(findings)) => all_findings.extend(findings),
                Ok(Err(e)) => {
                    error!(error = %e, "Agent failed");
                }
                Err(e) => {
                    error!(error = %e, "Agent task panicked");
                }
            }
        }

        Ok(all_findings)
    }
}