use std::sync::OnceLock;

use serde::Deserialize;

const ANCHOR_TEMPLATE_CONFIG: &str = include_str!("creation_agent_anchor_templates.json");

#[derive(Clone, Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
pub(crate) struct CreationAgentAnchorTemplateConfig {
    templates: Vec<CreationAgentAnchorTemplate>,
}

#[derive(Clone, Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
pub(crate) struct CreationAgentAnchorTemplate {
    pub template_id: String,
    pub display_name: String,
    pub creation_goal: String,
    pub anchor_questions: Vec<CreationAgentAnchorQuestion>,
}

#[derive(Clone, Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
pub(crate) struct CreationAgentAnchorQuestion {
    pub key: String,
    pub label: String,
    pub question: String,
    pub required_effect: String,
}

static ANCHOR_TEMPLATES: OnceLock<CreationAgentAnchorTemplateConfig> = OnceLock::new();

pub(crate) fn get_creation_agent_anchor_template(
    template_id: &str,
) -> Option<&'static CreationAgentAnchorTemplate> {
    load_creation_agent_anchor_templates()
        .templates
        .iter()
        .find(|template| template.template_id == template_id)
}

pub(crate) fn render_anchor_question_block(template: &CreationAgentAnchorTemplate) -> String {
    let mut lines = vec![
        format!("模板目标：{}", template.creation_goal),
        "".to_string(),
    ];
    lines.push("本模板只通过以下锚点问题体现差异：".to_string());
    for (index, question) in template.anchor_questions.iter().enumerate() {
        lines.push(format!(
            "{}. {}（{} / {}）：{}；达成效果：{}",
            index + 1,
            question.label,
            question.key,
            template.display_name,
            question.question,
            question.required_effect
        ));
    }
    lines.join("\n")
}

fn load_creation_agent_anchor_templates() -> &'static CreationAgentAnchorTemplateConfig {
    ANCHOR_TEMPLATES.get_or_init(|| {
        serde_json::from_str(ANCHOR_TEMPLATE_CONFIG)
            .expect("creation_agent_anchor_templates.json 必须是合法配置")
    })
}