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use hyper::http::request::Parts;
use serde::Deserialize;
use sputnik::html_escape;

use crate::{action_links, controller::Controller, get_renderer, Context, Error, Page, Response};

fn render_error(message: &str) -> String {
    format!("<div class=error>error: {}</div>", html_escape(message))
}

#[derive(Deserialize, Default)]
pub struct EditForm {
    pub text: String,
    pub msg: Option<String>,
    pub oid: Option<String>,
}

pub fn edit_text_form<'a, C: Controller>(
    data: &EditForm,
    error: Option<&str>,
    controller: &'a C,
    ctx: &'a Context,
    parts: &Parts,
) -> Page {
    let mut page = Page {
        title: format!(
            "{} {}",
            if data.oid.is_some() {
                "Editing"
            } else {
                "Creating"
            },
            ctx.path.file_name().unwrap().to_str().unwrap()
        ),
        header: data
            .oid
            .is_some()
            .then(|| action_links("edit", controller, ctx, parts)),
        scripts: vec![include_str!("static/edit_script.js")],
        script_src: vec![include_str!("static/edit_script.js.sha")],
        ..Default::default()
    };
    if let Some(access_info_html) = controller.access_info_html(&ctx, parts) {
        page.body.push_str(&access_info_html);
    }
    if let Some(hint_html) = controller.edit_hint_html(ctx) {
        page.body
            .push_str(&format!("<div class=edit-hint>{}</div>", hint_html));
    }
    if let Some(error) = error {
        page.body.push_str(&render_error(error));
    }
    page.body.push_str(&format!(
        "<form method=post action='?action=edit' class=edit-form>\
        <textarea name=text autofocus autocomplete=off>{}</textarea>",
        html_escape(&data.text)
    ));
    page.body
        .push_str("<div class=buttons><button>Save</button>");
    if let Some(oid) = &data.oid {
        page.body.push_str(&format!(
            "<input name=oid type=hidden value='{}'>
            <button formaction='?action=diff'>Diff</button>",
            oid
        ));
    }
    if get_renderer(&ctx.path).is_some() {
        page.body
            .push_str(" <button formaction='?action=preview'>Preview</button>")
    }
    page.body.push_str(&format!(
        "<input name=msg placeholder=Message value='{}' autocomplete=off></div></form>",
        html_escape(data.msg.as_deref().unwrap_or_default())
    ));
    page
}

#[derive(Deserialize)]
pub struct MoveForm {
    pub dest: String,
    pub msg: Option<String>,
}

pub fn move_form<C: Controller>(
    filename: &str,
    data: &MoveForm,
    error: Option<&str>,
    controller: &C,
    ctx: &Context,
    parts: &Parts,
) -> Result<Response, Error> {
    let mut page = Page {
        title: format!("Move {}", filename),
        header: Some(action_links("move", controller, ctx, parts)),
        ..Default::default()
    };

    if let Some(error) = error {
        page.body.push_str(&render_error(error));
    }

    page.body.push_str(&format!(
        "<form method=post autocomplete=off>
        <label>Destination <input name=dest value='{}' autofocus></label>
        <label>Message <input name=msg value='{}'></label>
        <button>Move</button>
        </form>",
        html_escape(&data.dest),
        data.msg.as_ref().map(html_escape).unwrap_or_default(),
    ));

    Ok(page.into())
}

pub fn upload_form<'a, C: Controller>(
    file_exists: bool,
    controller: &'a C,
    ctx: &'a Context,
    parts: &Parts,
) -> Page {
    let filename = ctx.path.file_name().unwrap().to_str().unwrap();
    Page {
        title: format!("Uploading {}", filename),
        // TODO: add input for commit message
        body: "<form action=?action=upload method=post enctype='multipart/form-data'>\
            <input name=file type=file>\
            <button>Upload</button>\
        </form>"
            .into(),
        header: file_exists.then(|| action_links("edit", controller, &ctx, parts)),
        ..Default::default()
    }
}