use serde::{Deserialize, Serialize};
use uuid::Uuid;

use crate::error::AppError;
use crate::models::common::{Role, State};
use crate::models::repos::{RepoCommitComment, RepoCommitStatus};
use crate::service::RepoService;
use crate::session::Session;

use super::util::{clamp_limit_offset, required_text};

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct CreateCommitStatusParams {
    pub push_commit_id: Uuid,
    pub latest_commit_sha: String,
    pub context: String,
    pub state: String,
    pub target_url: Option<String>,
    pub description: Option<String>,
}

#[derive(Deserialize, Serialize, Clone, Debug, utoipa::ToSchema)]
pub struct CreateCommitCommentParams {
    pub push_commit_id: Uuid,
    pub commit_sha: String,
    pub body: String,
    pub path: Option<String>,
    pub line: Option<i32>,
}

impl RepoService {
    pub async fn repo_commit_statuses(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        push_commit_id: Uuid,
        limit: i64,
        offset: i64,
    ) -> Result<Vec<RepoCommitStatus>, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        let repo_id = repo.id;
        self.ensure_repo_readable(user_uid, &repo).await?;
        let (limit, offset) = clamp_limit_offset(limit, offset);
        sqlx::query_as::<_, RepoCommitStatus>(
            "SELECT id, repo_id, push_commit_id, latest_commit_sha, context, state, target_url, description, reported_by, reported_at, created_at, updated_at FROM repo_commit_status WHERE repo_id = $1 AND push_commit_id = $2 ORDER BY created_at DESC LIMIT $3 OFFSET $4",
        )
        .bind(repo_id)
        .bind(push_commit_id)
        .bind(limit)
        .bind(offset)
        .fetch_all(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)
    }

    pub async fn repo_create_commit_status(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        params: CreateCommitStatusParams,
    ) -> Result<RepoCommitStatus, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        let repo_id = repo.id;
        self.ensure_repo_role_at_least(user_uid, &repo, Role::Member)
            .await?;
        let context = required_text(params.context, "context")?;
        let state = params
            .state
            .trim()
            .parse::<State>()
            .map_err(|_| AppError::BadRequest("invalid state".into()))?;
        if state == State::Unknown {
            return Err(AppError::BadRequest("invalid state".into()));
        }
        let latest_commit_sha = required_text(params.latest_commit_sha, "latest_commit_sha")?;
        let now = chrono::Utc::now();

        let mut txn = self
            .ctx
            .db
            .writer()
            .begin()
            .await
            .map_err(|_| AppError::TxnError)?;
        sqlx::query("SET LOCAL app.current_user_id = $1")
            .bind(user_uid)
            .execute(&mut *txn)
            .await
            .map_err(AppError::Database)?;

        let result = sqlx::query_as::<_, RepoCommitStatus>(
            "INSERT INTO repo_commit_status (id, repo_id, push_commit_id, latest_commit_sha, context, \
             state, target_url, description, reported_by, reported_at, created_at, updated_at) \
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $10, $10) RETURNING id, repo_id, push_commit_id, latest_commit_sha, context, state, target_url, description, reported_by, reported_at, created_at, updated_at",
        )
        .bind(Uuid::now_v7())
        .bind(repo_id)
        .bind(params.push_commit_id)
        .bind(&latest_commit_sha)
        .bind(&context)
        .bind(state)
        .bind(&params.target_url)
        .bind(&params.description)
        .bind(user_uid)
        .bind(now)
        .fetch_one(&mut *txn)
        .await
        .map_err(AppError::Database)?;

        txn.commit().await.map_err(|_| AppError::TxnError)?;
        Ok(result)
    }

    pub async fn repo_commit_comments(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        push_commit_id: Uuid,
        limit: i64,
        offset: i64,
    ) -> Result<Vec<RepoCommitComment>, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        let repo_id = repo.id;
        self.ensure_repo_readable(user_uid, &repo).await?;
        let (limit, offset) = clamp_limit_offset(limit, offset);
        sqlx::query_as::<_, RepoCommitComment>(
            "SELECT id, repo_id, push_commit_id, commit_sha, author_id, body, path, line, resolved, resolved_by, resolved_at, created_at, updated_at, deleted_at FROM repo_commit_comment WHERE repo_id = $1 AND push_commit_id = $2 AND deleted_at IS NULL ORDER BY created_at DESC LIMIT $3 OFFSET $4",
        )
        .bind(repo_id)
        .bind(push_commit_id)
        .bind(limit)
        .bind(offset)
        .fetch_all(self.ctx.db.reader())
        .await
        .map_err(AppError::Database)
    }

    pub async fn repo_create_commit_comment(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        params: CreateCommitCommentParams,
    ) -> Result<RepoCommitComment, AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        let repo_id = repo.id;
        self.ensure_repo_role_at_least(user_uid, &repo, Role::Member)
            .await?;
        let body = required_text(params.body, "body")?;
        let commit_sha = required_text(params.commit_sha, "commit_sha")?;
        let now = chrono::Utc::now();

        let mut txn = self
            .ctx
            .db
            .writer()
            .begin()
            .await
            .map_err(|_| AppError::TxnError)?;
        sqlx::query("SET LOCAL app.current_user_id = $1")
            .bind(user_uid)
            .execute(&mut *txn)
            .await
            .map_err(AppError::Database)?;

        let result = sqlx::query_as::<_, RepoCommitComment>(
            "INSERT INTO repo_commit_comment (id, repo_id, push_commit_id, commit_sha, author_id, body, \
             path, line, resolved, created_at, updated_at) \
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, false, $9, $9) RETURNING id, repo_id, push_commit_id, commit_sha, author_id, body, path, line, resolved, resolved_by, resolved_at, created_at, updated_at, deleted_at",
        )
        .bind(Uuid::now_v7())
        .bind(repo_id)
        .bind(params.push_commit_id)
        .bind(&commit_sha)
        .bind(user_uid)
        .bind(&body)
        .bind(&params.path)
        .bind(params.line)
        .bind(now)
        .fetch_one(&mut *txn)
        .await
        .map_err(AppError::Database)?;

        txn.commit().await.map_err(|_| AppError::TxnError)?;
        Ok(result)
    }

    pub async fn repo_resolve_commit_comment(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        comment_id: Uuid,
    ) -> Result<(), AppError> {
        let user_uid = ctx.user().ok_or(AppError::Unauthorized)?;
        let repo = self.resolve_repo(wk_name, repo_name).await?;
        let repo_id = repo.id;
        self.ensure_repo_role_at_least(user_uid, &repo, Role::Member)
            .await?;
        let now = chrono::Utc::now();

        let mut txn = self
            .ctx
            .db
            .writer()
            .begin()
            .await
            .map_err(|_| AppError::TxnError)?;
        sqlx::query("SET LOCAL app.current_user_id = $1")
            .bind(user_uid)
            .execute(&mut *txn)
            .await
            .map_err(AppError::Database)?;

        let result = sqlx::query(
            "UPDATE repo_commit_comment SET resolved = true, resolved_by = $1, resolved_at = $2, updated_at = $2 \
             WHERE id = $3 AND repo_id = $4 AND deleted_at IS NULL AND resolved = false",
        )
        .bind(user_uid)
        .bind(now)
        .bind(comment_id)
        .bind(repo_id)
        .execute(&mut *txn)
        .await
        .map_err(AppError::Database)?;
        super::util::ensure_affected(
            result.rows_affected(),
            "comment not found or already resolved",
        )?;

        txn.commit().await.map_err(|_| AppError::TxnError)?;
        Ok(())
    }
}