package fr.monlouyan.bakefile;

import java.io.File;
import java.util.List;
import java.util.Date;

public class Rule {
    private String name;
    private List<String> dependencies;
    private List<String> commands;
    private boolean isPhony;

    public Rule(String name, List<String> dependencies, List<String> commands, boolean isPhony) {
        this.name = name;
        this.dependencies = dependencies;
        this.commands = commands;
        this.isPhony = isPhony;
    }

    public String getName() { return name; }
    public List<String> getDependencies() { return dependencies; }
    public List<String> getCommands() { return commands; }
    public boolean isPhony() { return isPhony; }
    public boolean isEmpty() { return dependencies.isEmpty() && commands.isEmpty(); }

    public boolean needsUpdate() {
        if (BakeCLI.isDebug()){
            System.out.println("Debug : Checking if rule " + name + " needs update");
        }
    
        // Les règles phony sont toujours mises à jour
        if (isPhony) {
            if (BakeCLI.isDebug()) {
                System.out.println("Debug : Rule " + name + " is phony, always needs update");
            }
            return true;
        }
    
        // Skip targets with tilde in path (home directory) to match make behavior
        if (name.startsWith("~")) {
            if (BakeCLI.isDebug()) {
                System.out.println("Debug : Skipping home directory path: " + name);
            }
            return false;
        }
    
        // Vérifier d'abord toutes les dépendances avant d'exécuter quoi que ce soit
        for (String dependency : dependencies) {
            // Skip dependencies with tilde in path
            if (dependency.startsWith("~")) {
                continue;
            }
            
            File depFile = new File(dependency);
            boolean hasRule = BakeEngine.hasRule(dependency);
            if (!depFile.exists() && !dependency.isEmpty() && !hasRule) {
                System.out.println("bake: *** No rule to make target `" + dependency + "', needed by `" + name + "'.  Stop.");
                System.exit(1);
            }
        }

        // Si le fichier cible n'existe pas et qu'il y a des commandes, il doit être mis à jour
        File targetFile = new File(name);
        if (!targetFile.exists() && !commands.isEmpty()) {
            if (BakeCLI.isDebug()) {
                System.out.println("Debug : Target file " + name + " does not exist and has commands, needs update");
            }
            return true;
        }
    
        // Si la règle n'a pas de commandes, on vérifie seulement si une dépendance doit être mise à jour
        if (commands.isEmpty()) {
            for (String dependency : dependencies) {
                // Skip dependencies with tilde in path
                if (dependency.startsWith("~")) {
                    continue;
                }
                
                Rule depRule = BakeEngine.getRule(dependency);
                if (depRule != null && depRule.needsUpdate()) {
                    if (BakeCLI.isDebug()) {
                        System.out.println("Debug : Dependency rule " + dependency + " needs update");
                    }
                    return true;
                }
            }
            return false;
        }
    
        // Pour les règles avec des commandes, on vérifie aussi les timestamps
        if (BakeCLI.isDebug()){
            System.out.println("Debug : Checking if target file " + name + " exist and is up to date");
        }
    
        long targetTimestamp = targetFile.exists() ? TimestampManager.getTimestamp(targetFile) : 0;
        
        if (BakeCLI.isDebug()) {
            System.out.println("Debug : Target file '" + name + "' last modified at " + TimestampManager.formatTimestamp(targetTimestamp));
        }
    
        long currentTime = System.currentTimeMillis();
        
        for (String dependency : dependencies) {
            // Skip dependencies with tilde in path
            if (dependency.startsWith("~")) {
                continue;
            }
            
            File depFile = new File(dependency);
            if (!depFile.exists()) {
                continue;
            }
            
            long depTimestamp = TimestampManager.getTimestamp(depFile);
    
            // Vérifier si le timestamp de la dépendance est dans le futur
            if (depTimestamp > currentTime) {
                // Avertissement similaire à make
                System.out.println("bake: Warning: File '" + dependency + "' has modification time " 
                                  + ((depTimestamp - currentTime) / 1000) + " s in the future");
                if (BakeCLI.isDebug()) {
                    System.out.println("Debug : Dependency " + dependency + " has a timestamp in the future, needs update");
                }
                return true;
            }
    
            if (BakeCLI.isDebug()) {
                System.out.println("Debug : Dependency '" + dependency + "' last modified at " + TimestampManager.formatTimestamp(depTimestamp));
            }
    
            // Si la dépendance est une règle et qu'elle a besoin d'être mise à jour
            Rule depRule = BakeEngine.getRule(dependency);
            if (depRule != null && depRule.needsUpdate()) {
                if (BakeCLI.isDebug()) {
                    System.out.println("Debug : Dependency rule " + dependency + " needs update");
                }
                return true;
            }
    
            // Vérifier les timestamps seulement si le fichier existe
            if (depTimestamp > targetTimestamp) {
                if (BakeCLI.isDebug()) {
                    System.out.println("Debug : Dependency " + dependency + " is newer than target file " + name + ", needs update");
                }
                return true;
            }
        }
        
        return false;
    }
}