mortar_compiler 0.2.0

use crate::parser::*;
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use std::path::Path;

#[derive(Serialize, Deserialize)]
pub struct MortaredOutput {
    metadata: Metadata,
    nodes: Vec<JsonNode>,
    functions: Vec<JsonFunction>,
}

#[derive(Serialize, Deserialize)]
struct Metadata {
    version: String,
    generated_at: DateTime<Utc>,
}

#[derive(Serialize, Deserialize)]
struct JsonNode {
    name: String,
    texts: Vec<JsonText>,
    #[serde(skip_serializing_if = "Option::is_none")]
    next: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    choice: Option<Vec<JsonChoice>>,
}

#[derive(Serialize, Deserialize)]
struct JsonText {
    text: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    events: Option<Vec<JsonEvent>>,
}

#[derive(Serialize, Deserialize, Clone)]
struct JsonEvent {
    index: f64,
    actions: Vec<JsonAction>,
}

#[derive(Serialize, Deserialize, Clone)]
struct JsonAction {
    #[serde(rename = "type")]
    action_type: String,
    #[serde(skip_serializing_if = "Vec::is_empty")]
    args: Vec<String>,
}

#[derive(Serialize, Deserialize)]
struct JsonChoice {
    text: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    condition: Option<JsonCondition>,
    #[serde(skip_serializing_if = "Option::is_none")]
    next: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    action: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    choice: Option<Vec<JsonChoice>>,
}

#[derive(Serialize, Deserialize)]
struct JsonCondition {
    #[serde(rename = "type")]
    condition_type: String,
    #[serde(skip_serializing_if = "Vec::is_empty")]
    args: Vec<String>,
}

#[derive(Serialize, Deserialize)]
struct JsonFunction {
    name: String,
    #[serde(skip_serializing_if = "Vec::is_empty")]
    params: Vec<JsonParam>,
    #[serde(skip_serializing_if = "Option::is_none")]
    #[serde(rename = "return")]
    return_type: Option<String>,
}

#[derive(Serialize, Deserialize)]
struct JsonParam {
    name: String,
    #[serde(rename = "type")]
    param_type: String,
}

pub struct Serializer;

impl Serializer {
    pub fn serialize_to_json(program: &Program) -> Result<String, String> {
        let mortared = Self::convert_program_to_mortared(program)?;
        serde_json::to_string_pretty(&mortared).map_err(|e| format!("Serialization error: {}", e))
    }

    pub fn save_to_file(program: &Program, input_path: &str) -> Result<(), String> {
        let input_path = Path::new(input_path);
        let json_content = Self::serialize_to_json(program)?;

        let output_path = input_path.with_extension("mortared");
        std::fs::write(&output_path, json_content)
            .map_err(|e| format!("Failed to write file {}: {}", output_path.display(), e))?;

        println!("Generated: {}", output_path.display());
        Ok(())
    }

    fn convert_program_to_mortared(program: &Program) -> Result<MortaredOutput, String> {
        let metadata = Metadata {
            version: "0.1.0".to_string(),
            generated_at: Utc::now(),
        };

        let mut nodes = Vec::new();
        let mut functions = Vec::new();

        for top_level in &program.body {
            match top_level {
                TopLevel::NodeDef(node_def) => {
                    nodes.push(Self::convert_node_def(node_def)?);
                }
                TopLevel::FunctionDecl(func_decl) => {
                    functions.push(Self::convert_function_decl(func_decl));
                }
            }
        }

        Ok(MortaredOutput {
            metadata,
            nodes,
            functions,
        })
    }

    fn convert_node_def(node_def: &NodeDef) -> Result<JsonNode, String> {
        let mut texts = Vec::new();
        let mut choices = None;

        // Group texts and events, separate choices
        let mut current_text: Option<String> = None;
        let mut current_events: Vec<JsonEvent> = Vec::new();

        for stmt in &node_def.body {
            match stmt {
                NodeStmt::Text(text) => {
                    // If we have a current text, save it first
                    if let Some(text_content) = current_text.take() {
                        texts.push(JsonText {
                            text: text_content,
                            events: if current_events.is_empty() {
                                None
                            } else {
                                Some(current_events.clone())
                            },
                        });
                        current_events.clear();
                    }
                    current_text = Some(text.clone());
                }
                NodeStmt::Events(events) => {
                    // Convert events and associate with current text
                    for event in events {
                        current_events.push(Self::convert_event(event)?);
                    }
                }
                NodeStmt::Choice(choice_items) => {
                    // Save any pending text first
                    if let Some(text_content) = current_text.take() {
                        texts.push(JsonText {
                            text: text_content,
                            events: if current_events.is_empty() {
                                None
                            } else {
                                Some(current_events.clone())
                            },
                        });
                        current_events.clear();
                    }

                    let mut json_choices = Vec::new();
                    for item in choice_items {
                        json_choices.push(Self::convert_choice_item(item)?);
                    }
                    choices = Some(json_choices);
                }
            }
        }

        // Don't forget the last text if any
        if let Some(text_content) = current_text {
            texts.push(JsonText {
                text: text_content,
                events: if current_events.is_empty() {
                    None
                } else {
                    Some(current_events)
                },
            });
        }

        let next = match &node_def.jump {
            Some(NodeJump::Identifier(name)) => Some(name.clone()),
            _ => None,
        };

        Ok(JsonNode {
            name: node_def.name.clone(),
            texts,
            next,
            choice: choices,
        })
    }

    fn convert_event(event: &Event) -> Result<JsonEvent, String> {
        let mut actions = vec![Self::convert_func_call_to_action(&event.action.call)?];

        // Add chained actions
        for chain_call in &event.action.chains {
            actions.push(Self::convert_func_call_to_action(chain_call)?);
        }

        Ok(JsonEvent {
            index: event.index,
            actions,
        })
    }

    fn convert_func_call_to_action(func_call: &FuncCall) -> Result<JsonAction, String> {
        let mut args = Vec::new();

        for arg in &func_call.args {
            match arg {
                Arg::String(s) => args.push(s.clone()),
                Arg::Number(n) => args.push(n.to_string()),
                Arg::Identifier(id) => args.push(id.clone()),
                Arg::FuncCall(_) => {
                    return Err(
                        "Nested function calls in arguments not supported in JSON output"
                            .to_string(),
                    );
                }
            }
        }

        Ok(JsonAction {
            action_type: func_call.name.clone(),
            args,
        })
    }

    fn convert_choice_item(choice_item: &ChoiceItem) -> Result<JsonChoice, String> {
        let condition = match &choice_item.condition {
            Some(Condition::Identifier(id)) => Some(JsonCondition {
                condition_type: id.clone(),
                args: Vec::new(),
            }),
            Some(Condition::FuncCall(func_call)) => Some(JsonCondition {
                condition_type: func_call.name.clone(),
                args: func_call
                    .args
                    .iter()
                    .map(|arg| match arg {
                        Arg::String(s) => s.clone(),
                        Arg::Number(n) => n.to_string(),
                        Arg::Identifier(id) => id.clone(),
                        Arg::FuncCall(_) => "nested_call".to_string(), // Simplified
                    })
                    .collect(),
            }),
            None => None,
        };

        let (next, action, nested_choice) = match &choice_item.target {
            ChoiceDest::Identifier(name) => (Some(name.clone()), None, None),
            ChoiceDest::Return => (None, Some("return".to_string()), None),
            ChoiceDest::Break => (None, Some("break".to_string()), None),
            ChoiceDest::NestedChoices(nested_items) => {
                let mut nested_choices = Vec::new();
                for item in nested_items {
                    nested_choices.push(Self::convert_choice_item(item)?);
                }
                (None, None, Some(nested_choices))
            }
        };

        Ok(JsonChoice {
            text: choice_item.text.clone(),
            condition,
            next,
            action,
            choice: nested_choice,
        })
    }

    fn convert_function_decl(func_decl: &FunctionDecl) -> JsonFunction {
        let params = func_decl
            .params
            .iter()
            .map(|param| JsonParam {
                name: param.name.clone(),
                param_type: param.type_name.clone(),
            })
            .collect();

        JsonFunction {
            name: func_decl.name.clone(),
            params,
            return_type: func_decl.return_type.clone(),
        }
    }
}