wsb 0.203.4400

use crate::prelude::*;
use std::fs;
use tera::{Context as TeraContext, Tera};

use crate::state::VersionInfo;
use crate::workspace_state::WorkspaceState;

/// Template configuration and metadata
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct TemplateConfig {
    pub name: String,
    pub description: Option<String>,
    pub source_path: String,
    pub output_path: String,
    pub enabled: bool,
}

/// Template manager for state
pub struct TemplateManager {
    project_root: PathBuf,
    templates_dir: PathBuf,
    tera_engine: Tera,
    templates: HashMap<String, TemplateConfig>,
}

impl TemplateManager {
    /// Initialize template manager for a project
    pub fn new(workspace_state: &WorkspaceState) -> Result<Self> {
        let project_root = workspace_state.project_root.clone();
        let templates_dir = workspace_state.workspace_dir().join("templates");
        fs::create_dir_all(&templates_dir).context("Failed to create templates directory")?;

        // Initialize empty Tera engine
        let mut tera_engine = Tera::default();

        // Load template configurations
        let templates = Self::load_template_configs(&templates_dir)?;

        // Register templates with Tera
        for template_config in templates.values() {
            let template_path = templates_dir.join(&template_config.source_path);
            if template_path.exists() {
                let template_content = fs::read_to_string(&template_path).with_context(|| {
                    format!("Failed to read template: {}", template_path.display())
                })?;

                tera_engine
                    .add_raw_template(&template_config.name, &template_content)
                    .with_context(|| {
                        format!("Failed to register template: {}", template_config.name)
                    })?;
            }
        }

        Ok(Self {
            project_root,
            templates_dir,
            tera_engine,
            templates,
        })
    }

    /// Add a new template
    pub fn add_template(
        &mut self,
        name: &str,
        template_content: &str,
        output_path: &str,
        description: Option<String>,
    ) -> Result<()> {
        let template_filename = format!("{}.tera", name);
        let template_path = self.templates_dir.join(&template_filename);

        // Write template file
        fs::write(&template_path, template_content).with_context(|| {
            format!("Failed to write template file: {}", template_path.display())
        })?;

        // Create template config
        let template_config = TemplateConfig {
            name: name.to_string(),
            description,
            source_path: template_filename,
            output_path: output_path.to_string(),
            enabled: true,
        };

        // Register with Tera
        self.tera_engine
            .add_raw_template(name, template_content)
            .with_context(|| format!("Failed to register template: {}", name))?;

        // Store config
        self.templates.insert(name.to_string(), template_config);

        // Save configurations
        self.save_template_configs()?;

        Ok(())
    }

    /// Remove a template
    pub fn remove_template(&mut self, name: &str) -> Result<bool> {
        if let Some(template_config) = self.templates.remove(name) {
            let template_path = self.templates_dir.join(&template_config.source_path);

            // Remove template file if it exists
            if template_path.exists() {
                fs::remove_file(&template_path).with_context(|| {
                    format!(
                        "Failed to remove template file: {}",
                        template_path.display()
                    )
                })?;
            }

            // Remove from Tera (note: Tera doesn't have a remove method, so we reconstruct)
            self.rebuild_tera_engine()?;

            // Save updated configurations
            self.save_template_configs()?;

            Ok(true)
        } else {
            Ok(false)
        }
    }

    /// List all templates
    pub fn list_templates(&self) -> Vec<&TemplateConfig> {
        self.templates.values().collect()
    }

    /// Get a specific template
    pub fn get_template(&self, name: &str) -> Option<&TemplateConfig> {
        self.templates.get(name)
    }

    /// Enable or disable a template
    pub fn set_template_enabled(&mut self, name: &str, enabled: bool) -> Result<bool> {
        if let Some(template_config) = self.templates.get_mut(name) {
            template_config.enabled = enabled;
            self.save_template_configs()?;
            Ok(true)
        } else {
            Ok(false)
        }
    }

    /// Render all enabled templates
    pub fn render_all_templates(
        &self,
        version_info: &VersionInfo,
        project_name: Option<&str>,
    ) -> Result<Vec<String>> {
        let mut rendered_files = Vec::new();
        let context = self.create_template_context(version_info, project_name);

        for template_config in self.templates.values() {
            if template_config.enabled {
                match self.render_template(template_config, &context) {
                    Ok(output_path) => {
                        rendered_files.push(output_path);
                    }
                    Err(e) => {
                        warn!(
                            "Failed to render template '{}': {}",
                            template_config.name, e
                        );
                    }
                }
            }
        }

        Ok(rendered_files)
    }

    /// Render a specific template
    pub fn render_template(
        &self,
        template_config: &TemplateConfig,
        context: &TeraContext,
    ) -> Result<String> {
        let rendered_content = self
            .tera_engine
            .render(&template_config.name, context)
            .with_context(|| format!("Failed to render template: {}", template_config.name))?;

        // Write to output file
        let output_path = if Path::new(&template_config.output_path).is_absolute() {
            PathBuf::from(&template_config.output_path)
        } else {
            self.project_root.join(&template_config.output_path)
        };

        // Create parent directories if needed
        if let Some(parent) = output_path.parent() {
            fs::create_dir_all(parent).with_context(|| {
                format!("Failed to create output directory: {}", parent.display())
            })?;
        }

        fs::write(&output_path, rendered_content).with_context(|| {
            format!(
                "Failed to write rendered template to: {}",
                output_path.display()
            )
        })?;

        Ok(output_path.display().to_string())
    }

    /// Create template context with all available variables
    fn create_template_context(
        &self,
        version_info: &VersionInfo,
        project_name: Option<&str>,
    ) -> TeraContext {
        let mut context = TeraContext::new();

        // Project information
        let mut project = HashMap::new();
        project.insert("version".to_string(), version_info.full_version.clone());
        project.insert(
            "major_version".to_string(),
            version_info.major_version.clone(),
        );
        project.insert(
            "minor_version".to_string(),
            version_info.minor_version.to_string(),
        );
        project.insert(
            "patch_version".to_string(),
            version_info.patch_version.to_string(),
        );

        if let Some(name) = project_name {
            project.insert("name".to_string(), name.to_string());
        }

        context.insert("project", &project);

        // Date and time
        let now = chrono::Local::now();
        let mut datetime = HashMap::new();
        datetime.insert("iso".to_string(), now.to_rfc3339());
        datetime.insert("date".to_string(), now.format("%Y-%m-%d").to_string());
        datetime.insert("time".to_string(), now.format("%H:%M:%S").to_string());
        datetime.insert("year".to_string(), now.format("%Y").to_string());
        datetime.insert("month".to_string(), now.format("%m").to_string());
        datetime.insert("day".to_string(), now.format("%d").to_string());

        context.insert("datetime", &datetime);

        context
    }

    /// Load template configurations from disk
    fn load_template_configs(templates_dir: &Path) -> Result<HashMap<String, TemplateConfig>> {
        let config_file = templates_dir.join("templates.json");

        if !config_file.exists() {
            return Ok(HashMap::new());
        }

        let content =
            fs::read_to_string(&config_file).context("Failed to read template configurations")?;

        let configs: HashMap<String, TemplateConfig> =
            serde_json::from_str(&content).context("Failed to parse template configurations")?;

        Ok(configs)
    }

    /// Save template configurations to disk
    fn save_template_configs(&self) -> Result<()> {
        let config_file = self.templates_dir.join("templates.json");
        let content = serde_json::to_string_pretty(&self.templates)
            .context("Failed to serialize template configurations")?;

        fs::write(&config_file, content).context("Failed to write template configurations")?;

        Ok(())
    }

    /// Rebuild Tera engine after template removal
    fn rebuild_tera_engine(&mut self) -> Result<()> {
        self.tera_engine = Tera::default();

        for template_config in self.templates.values() {
            let template_path = self.templates_dir.join(&template_config.source_path);
            if template_path.exists() {
                let template_content = fs::read_to_string(&template_path).with_context(|| {
                    format!("Failed to read template: {}", template_path.display())
                })?;

                self.tera_engine
                    .add_raw_template(&template_config.name, &template_content)
                    .with_context(|| {
                        format!("Failed to register template: {}", template_config.name)
                    })?;
            }
        }

        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use tempfile::TempDir;

    fn create_test_state(temp_dir: &Path) -> WorkspaceState {
        WorkspaceState::initialize(temp_dir, None).unwrap()
    }

    #[test]
    fn test_template_manager_creation() {
        let temp_dir = TempDir::new().unwrap();
        let state = create_test_state(temp_dir.path());

        let manager = TemplateManager::new(&state).unwrap();
        assert!(manager.templates_dir.exists());
        assert_eq!(manager.list_templates().len(), 0);
    }

    #[test]
    fn test_add_and_remove_template() {
        let temp_dir = TempDir::new().unwrap();
        let state = create_test_state(temp_dir.path());
        let mut manager = TemplateManager::new(&state).unwrap();

        let template_content = "# {{ project.name }} v{{ project.version }}\n\nRelease notes for version {{ project.version }}.";
        let output_path = "RELEASE_NOTES.md";

        // Add template
        manager
            .add_template(
                "release_notes",
                template_content,
                output_path,
                Some("Release notes template".to_string()),
            )
            .unwrap();

        assert_eq!(manager.list_templates().len(), 1);
        let template = manager.get_template("release_notes").unwrap();
        assert_eq!(template.name, "release_notes");
        assert_eq!(template.output_path, output_path);
        assert!(template.enabled);

        // Remove template
        let removed = manager.remove_template("release_notes").unwrap();
        assert!(removed);
        assert_eq!(manager.list_templates().len(), 0);

        // Try to remove non-existent template
        let removed = manager.remove_template("non_existent").unwrap();
        assert!(!removed);
    }

    #[test]
    fn test_enable_disable_template() {
        let temp_dir = TempDir::new().unwrap();
        let state = create_test_state(temp_dir.path());
        let mut manager = TemplateManager::new(&state).unwrap();

        let template_content = "Version: {{ project.version }}";
        manager
            .add_template("version", template_content, "VERSION.txt", None)
            .unwrap();

        // Disable template
        let result = manager.set_template_enabled("version", false).unwrap();
        assert!(result);

        let template = manager.get_template("version").unwrap();
        assert!(!template.enabled);

        // Enable template
        let result = manager.set_template_enabled("version", true).unwrap();
        assert!(result);

        let template = manager.get_template("version").unwrap();
        assert!(template.enabled);

        // Try to modify non-existent template
        let result = manager.set_template_enabled("non_existent", true).unwrap();
        assert!(!result);
    }

    #[test]
    fn test_template_context_creation() {
        let temp_dir = TempDir::new().unwrap();
        let state = create_test_state(temp_dir.path());
        let manager = TemplateManager::new(&state).unwrap();

        let version_info = VersionInfo {
            major_version: "v1.0".to_string(),
            minor_version: 5,
            patch_version: 100,
            full_version: "1.0.5.100".to_string(),
        };

        let context = manager.create_template_context(&version_info, Some("test-project"));

        // Verify context contains expected values
        let project = context.get("project").unwrap();
        assert!(project.is_object());

        let datetime = context.get("datetime").unwrap();
        assert!(datetime.is_object());
    }

    #[test]
    fn test_render_template() {
        let temp_dir = TempDir::new().unwrap();
        let state = create_test_state(temp_dir.path());
        let mut manager = TemplateManager::new(&state).unwrap();

        let template_content = "# {{ project.name | default(value='Unknown') }} v{{ project.version }}\n\nReleased on {{ datetime.date }}\n\n## Changes\n- Version bump to {{ project.version }}";
        let output_path = temp_dir.path().join("CHANGELOG.md");

        manager
            .add_template(
                "changelog",
                template_content,
                output_path.to_str().unwrap(),
                None,
            )
            .unwrap();

        let version_info = VersionInfo {
            major_version: "v1.0".to_string(),
            minor_version: 5,
            patch_version: 100,
            full_version: "1.0.5.100".to_string(),
        };

        let rendered_files = manager
            .render_all_templates(&version_info, Some("test-project"))
            .unwrap();

        assert_eq!(rendered_files.len(), 1);
        assert!(output_path.exists());

        let rendered_content = fs::read_to_string(&output_path).unwrap();
        assert!(rendered_content.contains("# test-project v1.0.5.100"));
        assert!(rendered_content.contains("Version bump to 1.0.5.100"));
    }

    #[test]
    fn test_template_persistence() {
        let temp_dir = TempDir::new().unwrap();
        let state = create_test_state(temp_dir.path());

        // Create manager and add template
        {
            let mut manager = TemplateManager::new(&state).unwrap();
            manager
                .add_template(
                    "test",
                    "{{ project.version }}",
                    "version.txt",
                    Some("Test template".to_string()),
                )
                .unwrap();
        }

        // Create new manager and verify template persisted
        {
            let manager = TemplateManager::new(&state).unwrap();
            assert_eq!(manager.list_templates().len(), 1);

            let template = manager.get_template("test").unwrap();
            assert_eq!(template.description, Some("Test template".to_string()));
        }
    }
}