use db::sqlx;
use model::repos::RepoProtectModel;
use serde::{Deserialize, Serialize};
use session::Session;

use crate::{AppService, Pagination, error::AppError, session_user};

#[derive(Debug, Clone, Serialize, Deserialize, utoipa::ToSchema)]
pub struct ProtectResponse {
    #[schema(value_type = String)]
    pub id: uuid::Uuid,
    #[schema(value_type = String)]
    pub repo: uuid::Uuid,
    pub pattern: String,
    pub require_pull_request: bool,
    pub required_approvals: i32,
    pub require_status_checks: bool,
    pub required_status_contexts: Vec<String>,
    pub enforce_admins: bool,
    pub allow_force_pushes: bool,
    pub allow_deletions: bool,
    #[schema(value_type = String)]
    pub created_at: chrono::DateTime<chrono::Utc>,
    #[schema(value_type = String)]
    pub updated_at: chrono::DateTime<chrono::Utc>,
}

pub fn protect_response(p: RepoProtectModel) -> ProtectResponse {
    ProtectResponse {
        id: p.id,
        repo: p.repo,
        pattern: p.pattern,
        require_pull_request: p.require_pull_request,
        required_approvals: p.required_approvals,
        require_status_checks: p.require_status_checks,
        required_status_contexts: p
            .required_status_contexts
            .split('.')
            .filter(|s| !s.is_empty())
            .map(|s| s.to_string())
            .collect(),
        enforce_admins: p.enforce_admins,
        allow_force_pushes: p.allow_force_pushes,
        allow_deletions: p.allow_deletions,
        created_at: p.created_at,
        updated_at: p.updated_at,
    }
}

#[derive(Debug, Clone, Deserialize, utoipa::ToSchema)]
pub struct CreateProtect {
    pub pattern: String,
    pub require_pull_request: Option<bool>,
    pub required_approvals: Option<i32>,
    pub require_status_checks: Option<bool>,
    pub required_status_contexts: Option<Vec<String>>,
    pub enforce_admins: Option<bool>,
    pub allow_force_pushes: Option<bool>,
    pub allow_deletions: Option<bool>,
}

#[derive(Debug, Clone, Deserialize, utoipa::ToSchema)]
pub struct UpdateProtect {
    pub pattern: Option<String>,
    pub require_pull_request: Option<bool>,
    pub required_approvals: Option<i32>,
    pub require_status_checks: Option<bool>,
    pub required_status_contexts: Option<Vec<String>>,
    pub enforce_admins: Option<bool>,
    pub allow_force_pushes: Option<bool>,
    pub allow_deletions: Option<bool>,
}

impl AppService {
    pub async fn repo_protect_list(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        pagination: Pagination,
    ) -> Result<Vec<ProtectResponse>, AppError> {
        let repo = self.git_require_member(ctx, wk_name, repo_name).await?;

        let rows = sqlx::query_as::<_, RepoProtectModel>(
            "SELECT id, repo, pattern, require_pull_request, required_approvals, \
             require_status_checks, required_status_contexts, enforce_admins, \
             allow_force_pushes, allow_deletions, created_at, updated_at \
             FROM repo_protect WHERE repo = $1 \
             ORDER BY pattern ASC OFFSET $2 LIMIT $3",
        )
        .bind(repo.id)
        .bind(pagination.offset() as i64)
        .bind(pagination.limit() as i64)
        .fetch_all(self.db.reader())
        .await
        .map_err(|e| AppError::DatabaseError(e.to_string()))?;

        Ok(rows.into_iter().map(protect_response).collect())
    }

    pub async fn repo_protect_create(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        params: CreateProtect,
    ) -> Result<ProtectResponse, AppError> {
        let user_uid = session_user(ctx)?;
        let wk = self.workspace_resolve(wk_name).await?;
        self.workspace_require_admin(wk.id, user_uid).await?;
        let repo = self.repo_resolve(wk.id, repo_name).await?;

        let pattern = params.pattern.trim();
        if pattern.is_empty() {
            return Err(AppError::BadRequest(
                "pattern is required".to_string(),
            ));
        }

        let contexts = params
            .required_status_contexts
            .unwrap_or_default()
            .join(".");

        let id = uuid::Uuid::now_v7();
        let now = chrono::Utc::now();

        let row = sqlx::query_as::<_, RepoProtectModel>(
            "INSERT INTO repo_protect \
             (id, repo, pattern, require_pull_request, required_approvals, \
              require_status_checks, required_status_contexts, enforce_admins, \
              allow_force_pushes, allow_deletions, created_at, updated_at) \
             VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $11) \
             RETURNING id, repo, pattern, require_pull_request, required_approvals, \
              require_status_checks, required_status_contexts, enforce_admins, \
              allow_force_pushes, allow_deletions, created_at, updated_at",
        )
        .bind(id)
        .bind(repo.id)
        .bind(pattern)
        .bind(params.require_pull_request.unwrap_or(true))
        .bind(params.required_approvals.unwrap_or(1))
        .bind(params.require_status_checks.unwrap_or(false))
        .bind(&contexts)
        .bind(params.enforce_admins.unwrap_or(false))
        .bind(params.allow_force_pushes.unwrap_or(false))
        .bind(params.allow_deletions.unwrap_or(false))
        .bind(now)
        .fetch_one(self.db.writer())
        .await
        .map_err(|e| AppError::DatabaseError(e.to_string()))?;

        Ok(protect_response(row))
    }

    pub async fn repo_protect_update(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        protect_id: uuid::Uuid,
        params: UpdateProtect,
    ) -> Result<ProtectResponse, AppError> {
        let user_uid = session_user(ctx)?;
        let wk = self.workspace_resolve(wk_name).await?;
        self.workspace_require_admin(wk.id, user_uid).await?;
        let repo = self.repo_resolve(wk.id, repo_name).await?;

        let existing = sqlx::query_as::<_, RepoProtectModel>(
            "SELECT id, repo, pattern, require_pull_request, required_approvals, \
             require_status_checks, required_status_contexts, enforce_admins, \
             allow_force_pushes, allow_deletions, created_at, updated_at \
             FROM repo_protect WHERE id = $1 AND repo = $2",
        )
        .bind(protect_id)
        .bind(repo.id)
        .fetch_optional(self.db.reader())
        .await
        .map_err(|e| AppError::DatabaseError(e.to_string()))?
        .ok_or(AppError::NotFound("protected branch rule not found".to_string()))?;

        let pattern = params.pattern.unwrap_or(existing.pattern);
        let require_pull_request = params
            .require_pull_request
            .unwrap_or(existing.require_pull_request);
        let required_approvals = params
            .required_approvals
            .unwrap_or(existing.required_approvals);
        let require_status_checks = params
            .require_status_checks
            .unwrap_or(existing.require_status_checks);
        let contexts = params
            .required_status_contexts
            .map(|c| c.join("."))
            .unwrap_or(existing.required_status_contexts);
        let enforce_admins =
            params.enforce_admins.unwrap_or(existing.enforce_admins);
        let allow_force_pushes = params
            .allow_force_pushes
            .unwrap_or(existing.allow_force_pushes);
        let allow_deletions =
            params.allow_deletions.unwrap_or(existing.allow_deletions);

        let row = sqlx::query_as::<_, RepoProtectModel>(
            "UPDATE repo_protect SET \
             pattern = $1, require_pull_request = $2, required_approvals = $3, \
             require_status_checks = $4, required_status_contexts = $5, enforce_admins = $6, \
             allow_force_pushes = $7, allow_deletions = $8, updated_at = $9 \
             WHERE id = $10 \
             RETURNING id, repo, pattern, require_pull_request, required_approvals, \
              require_status_checks, required_status_contexts, enforce_admins, \
              allow_force_pushes, allow_deletions, created_at, updated_at",
        )
        .bind(&pattern)
        .bind(require_pull_request)
        .bind(required_approvals)
        .bind(require_status_checks)
        .bind(&contexts)
        .bind(enforce_admins)
        .bind(allow_force_pushes)
        .bind(allow_deletions)
        .bind(chrono::Utc::now())
        .bind(protect_id)
        .fetch_one(self.db.writer())
        .await
        .map_err(|e| AppError::DatabaseError(e.to_string()))?;

        Ok(protect_response(row))
    }

    pub async fn repo_protect_delete(
        &self,
        ctx: &Session,
        wk_name: &str,
        repo_name: &str,
        protect_id: uuid::Uuid,
    ) -> Result<(), AppError> {
        let user_uid = session_user(ctx)?;
        let wk = self.workspace_resolve(wk_name).await?;
        self.workspace_require_admin(wk.id, user_uid).await?;
        let repo = self.repo_resolve(wk.id, repo_name).await?;

        let result =
            sqlx::query("DELETE FROM repo_protect WHERE id = $1 AND repo = $2")
                .bind(protect_id)
                .bind(repo.id)
                .execute(self.db.writer())
                .await
                .map_err(|e| AppError::DatabaseError(e.to_string()))?;

        if result.rows_affected() == 0 {
            return Err(AppError::NotFound(
                "protected branch rule not found".to_string(),
            ));
        }

        Ok(())
    }
}