/* This file is part of issue-bot.
 *
 * issue-bot is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * issue-bot is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with issue-bot.  If not, see <https://www.gnu.org/licenses/>.
 */

use super::*;

#[macro_export]
macro_rules! gitea_api_mismatch {
    ($map:ident[$value:literal].$conv_method:ident()) => {{
        $map[$value].$conv_method().ok_or_else(|| {
            log::error!(
                "issue API response missing valid {} field: {:?}",
                $value,
                $map
            );
            Error::new("Gitea API response or API version not matching what was expected.")
        })?
    }};
}

static ISSUES_BASE_URL: &str = "{base_url}/api/v1/repos/{repo}/issues";
static ISSUES_COMMENTS_URL: &str = "{base_url}/api/v1/repos/{repo}/issues/{index}/comments";

use serde::Serialize;

#[derive(Serialize, Default)]
struct CreateIssueOption {
    assignee: String,
    assignees: Vec<String>,
    body: String,
    closed: bool,
    title: String,
}

pub fn new_issue(
    conn: &Connection,
    title: String,
    body: String,
    anonymous: bool,
    submitter: Address,
    conf: &Configuration,
) -> Result<(Password, i64)> {
    let issue = CreateIssueOption {
        title,
        body: format!(
            "{} reports:\n\n{}",
            if anonymous {
                "Anonymous".to_string()
            } else {
                submitter.to_string()
            },
            body
        ),
        ..CreateIssueOption::default()
    };
    let client = reqwest::blocking::Client::new();
    let res = client
        .post(
            &ISSUES_BASE_URL
                .replace("{base_url}", &conf.base_url)
                .replace("{repo}", &conf.repo),
        )
        .header("Authorization", format!("token {}", &conf.auth_token))
        .json(&issue)
        .send()?
        .text()?;

    let map: serde_json::map::Map<String, serde_json::Value> = serde_json::from_str(&res)?;
    let issue = Issue {
        id: gitea_api_mismatch!(map["number"].as_i64()),
        submitter,
        password: Uuid::new_v4(),
        time_created: chrono::Local::now().to_rfc3339_opts(chrono::SecondsFormat::Millis, true),
        anonymous,
        subscribed: true,
        title: issue.title,
        last_update: gitea_api_mismatch!(map["created_at"].as_str()).to_string(),
    };
    conn.execute(
        "INSERT INTO issue (id, submitter, password, time_created, anonymous, subscribed, title, last_update)
                  VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)",
        &[
            &issue.id,
            &issue.submitter.to_string() as &dyn ToSql,
            &issue.password.as_bytes().to_vec(),
            &issue.time_created,
            &issue.anonymous,
            &issue.subscribed,
            &issue.title,
            &issue.last_update,
        ],
    )?;
    Ok((issue.password, issue.id))
}

#[derive(Serialize, Default)]
struct CreateIssueCommentOption {
    body: String,
}

pub fn new_reply(
    conn: &Connection,
    body: String,
    password: Password,
    submitter: Address,
    conf: &Configuration,
) -> Result<(String, i64, bool)> {
    let mut stmt =
        conn.prepare("SELECT id, title, subscribed, anonymous FROM issue WHERE password = ?")?;
    let mut results = stmt
        .query_map([password.as_bytes().to_vec()], |row| {
            Ok((row.get(0)?, row.get(1)?, row.get(2)?, row.get(3)?))
        })?
        .collect::<std::result::Result<Vec<(i64, String, bool, bool)>, _>>()?;
    if results.is_empty() {
        return Err(Error::new("Not found".to_string()));
    }
    let client = reqwest::blocking::Client::new();
    let response = client
        .post(
            &ISSUES_COMMENTS_URL
                .replace("{base_url}", &conf.base_url)
                .replace("{repo}", &conf.repo)
                .replace("{index}", &results[0].0.to_string()),
        )
        .header("Authorization", format!("token {}", &conf.auth_token))
        .json(&CreateIssueCommentOption {
            body: format!(
                "{} replies:\n\n{}",
                if results[0].3 {
                    "Anonymous".to_string()
                } else {
                    submitter.to_string()
                },
                body
            ),
        })
        .send()?;
    if response.status().is_success() {
        let (issue_id, title, is_subscribed, _) = results.remove(0);
        Ok((title, issue_id, is_subscribed))
    } else {
        eprintln!(
            "New reply could not be created: {:?}\npassword: {}\nsubmitter: {}\nbody: {}",
            response.status(),
            password,
            submitter,
            body
        );
        Err(Error::new(
            "You can not reply to this issue due to an internal error.",
        ))
    }
}

#[derive(Serialize, Default)]
struct EditIssueOption {
    state: String,
}

pub fn close(
    conn: &Connection,
    password: Password,
    conf: &Configuration,
) -> Result<(String, i64, bool)> {
    let mut stmt = conn.prepare("SELECT id, title, subscribed FROM issue WHERE password = ?")?;
    let mut results = stmt
        .query_map([password.as_bytes().to_vec()], |row| {
            Ok((row.get(0)?, row.get(1)?, row.get(2)?))
        })?
        .collect::<std::result::Result<Vec<(i64, String, bool)>, _>>()?;
    if results.is_empty() {
        return Err(Error::new("Not found".to_string()));
    }
    let client = reqwest::blocking::Client::new();
    let res = client
        .patch(&format!(
            "{}/{}",
            ISSUES_BASE_URL
                .replace("{base_url}", &conf.base_url)
                .replace("{repo}", &conf.repo),
            &results[0].0.to_string()
        ))
        .header("Authorization", format!("token {}", &conf.auth_token))
        .json(&EditIssueOption {
            state: "closed".to_string(),
        })
        .send()?
        .text()?;

    let map: serde_json::map::Map<String, serde_json::Value> = serde_json::from_str(&res)?;
    if map["state"] == "closed" {
        let (issue_id, title, is_subscribed) = results.remove(0);
        Ok((title, issue_id, is_subscribed))
    } else {
        eprintln!("Issue could not be closed: {:#?}", map);
        Err(Error::new(
            "Issue cannot be closed due to an internal error.",
        ))
    }
}

pub fn change_subscription(
    conn: &Connection,
    password: Password,
    new_val: bool,
) -> Result<(String, i64, bool)> {
    let mut stmt = conn.prepare("SELECT id, title, subscribed FROM issue WHERE password = ?")?;
    let mut results: Vec<(i64, String, bool)> = stmt
        .query_map([password.as_bytes().to_vec()], |row| {
            Ok((row.get(0)?, row.get(1)?, row.get(2)?))
        })?
        .collect::<std::result::Result<Vec<(i64, String, bool)>, _>>()?;
    if results.is_empty() {
        return Err(Error::new("Issue not found".to_string()));
    }
    let (issue_id, title, is_subscribed) = results.remove(0);
    if !is_subscribed && !new_val {
        return Err(Error::new(format!(
            "You are not subscribed to issue `{}`",
            &title
        )));
    } else if is_subscribed && new_val {
        return Err(Error::new(format!(
            "You are already subscribed to issue `{}`",
            &title
        )));
    }

    let mut stmt =
        conn.prepare("UPDATE issue SET subscribed = (:subscribed) WHERE password = (:password)")?;
    assert_eq!(
        stmt.execute(rusqlite::named_params! {
            ":subscribed": &new_val,
            ":password": &password.as_bytes().to_vec()
        })?,
        1
    );
    Ok((title, issue_id, is_subscribed))
}

pub fn comments(
    id: i64,
    since: &str,
    conf: &Configuration,
) -> Result<Vec<serde_json::map::Map<String, serde_json::Value>>> {
    let client = reqwest::blocking::Client::new();
    let result = client
        .get(
            &ISSUES_COMMENTS_URL
                .replace("{base_url}", &conf.base_url)
                .replace("{repo}", &conf.repo)
                .replace("{index}", &id.to_string()),
        )
        .query(&[("since", since)])
        .send()?
        .text()?;
    let result: Vec<_> = serde_json::from_str(&result)?;
    Ok(result)
}