use serde::{Deserialize, Serialize};
use std::io::BufRead;

use crate::VoiceError;

/// Content types for voice generation.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum ContentType {
    Behavior,
    Dialogue,
    Tell,
}

/// A single prompt payload, used in batch JSONL mode.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PromptPayload {
    pub id: String,
    pub content_type: ContentType,
    pub prompt: String,
    #[serde(default)]
    pub base_text: Option<String>,
    #[serde(default)]
    pub semantic_core: Option<String>,
}

/// Parse a JSONL file into a list of prompt payloads.
pub fn parse_jsonl(reader: impl BufRead) -> Result<Vec<PromptPayload>, VoiceError> {
    let mut payloads = Vec::new();
    for (i, line) in reader.lines().enumerate() {
        let line = line.map_err(|e| VoiceError::InvalidInput(format!("line {}: {}", i + 1, e)))?;
        let trimmed = line.trim();
        if trimmed.is_empty() {
            continue;
        }
        let payload: PromptPayload = serde_json::from_str(trimmed)
            .map_err(|e| VoiceError::InvalidInput(format!("line {}: {}", i + 1, e)))?;
        payloads.push(payload);
    }
    Ok(payloads)
}