//! System Service Integration (Agent Integrator)
//!
//! This module translates the mathematical optimums defined by the Analyst
//! into actionable, real-world Linux/OS service configurations.
//! It generates templates for fan daemons (i8kmon, thinkfan) and handles
//! resolution strategies for overlapping daemons.

use anyhow::Result;
use std::path::Path;
use std::fs;
use crate::agent_analyst::OptimizationMatrix;

pub struct ServiceIntegrator;

impl ServiceIntegrator {
    /// Generates and saves an i8kmon configuration based on the balanced profile.
    pub fn generate_i8kmon_config(matrix: &OptimizationMatrix, output_path: &Path) -> Result<()> {
        let profile = &matrix.balanced;
        
        let mut conf = String::new();
        conf.push_str("# Auto-generated by ember-tune Integrator
");
        conf.push_str(&format!("# Profile: {}

", profile.name));
        
        for (i, p) in profile.fan_curve.iter().enumerate() {
            // i8kmon syntax: set config(state) {left_fan right_fan temp_on temp_off}
            // State 0, 1, 2, 3 correspond to BIOS fan states (off, low, high)
            
            let state = match p.pwm_percent {
                0..=20 => 0,
                21..=50 => 1,
                51..=100 => 2,
                _ => 2,
            };

            let off = if i == 0 { "-".to_string() } else { format!("{}", p.temp_off) };
            conf.push_str(&format!("set config({}) {{{} {}  {}  {}}}
", i, state, state, p.temp_on, off));
        }

        fs::write(output_path, conf)?;
        Ok(())
    }

    /// Generates a thinkfan configuration.
    pub fn generate_thinkfan_config(matrix: &OptimizationMatrix, output_path: &Path) -> Result<()> {
        let profile = &matrix.balanced;
        
        let mut conf = String::new();
        conf.push_str("# Auto-generated by ember-tune Integrator
");
        conf.push_str("sensors:
  - hwmon: /sys/class/hwmon/hwmon0/temp1_input

");
        conf.push_str("levels:
");
        
        for (i, p) in profile.fan_curve.iter().enumerate() {
            // thinkfan syntax: - [level, temp_down, temp_up]
            let level = match p.pwm_percent {
                0..=20 => 0,
                21..=40 => 1,
                41..=60 => 3,
                61..=80 => 5,
                _ => 7,
            };

            let down = if i == 0 { 0.0 } else { p.temp_off };
            conf.push_str(&format!("  - [{}, {}, {}]
", level, down, p.temp_on));
        }

        fs::write(output_path, conf)?;
        Ok(())
    }

    /// Generates a resolution checklist/script for daemons.
    pub fn generate_conflict_resolution_script(output_path: &Path) -> Result<()> {
        let script = r#"#!/bin/bash
# ember-tune Daemon Neutralization Script

# 1. Mask power-profiles-daemon (Prevent ACPI overrides)
systemctl mask power-profiles-daemon

# 2. Filter TLP (Prevent CPU governor fights while keeping PCIe saving)
sed -i 's/^CPU_SCALING_GOVERNOR_ON_AC=.*/CPU_SCALING_GOVERNOR_ON_AC=""/' /etc/tlp.conf
sed -i 's/^CPU_BOOST_ON_AC=.*/CPU_BOOST_ON_AC=""/' /etc/tlp.conf
systemctl restart tlp

# 3. Thermald Delegate (We provide the trips, it handles the rest)
# (Ensure your custom thermal-conf.xml is in /etc/thermald/)
systemctl restart thermald
"#;
        fs::write(output_path, script)?;
        Ok(())
    }

    /// Generates a thermald configuration XML.
    pub fn generate_thermald_config(matrix: &OptimizationMatrix, output_path: &Path) -> Result<()> {
        let profile = &matrix.balanced;
        let mut xml = String::new();
        xml.push_str("<?xml version=\"1.0\"?>\n<ThermalConfiguration>\n  <Platform>\n    <Name>ember-tune Balanced</Name>\n    <ProductName>Generic</ProductName>\n    <Preference>balanced</Preference>\n    <ThermalZones>\n      <ThermalZone>\n        <Type>cpu</Type>\n        <TripPoints>\n");

        for (i, p) in profile.fan_curve.iter().enumerate() {
            xml.push_str(&format!("          <TripPoint>\n            <SensorType>cpu</SensorType>\n            <Temperature>{}</Temperature>\n            <Type>Passive</Type>\n            <ControlId>{}</ControlId>\n          </TripPoint>\n", p.temp_on * 1000.0, i));
        }

        xml.push_str("        </TripPoints>\n      </ThermalZone>\n    </ThermalZones>\n  </Platform>\n</ThermalConfiguration>\n");
        fs::write(output_path, xml)?;
        Ok(())
    }
}