use crate::bare::GitBare;
use crate::error::GitResult;
use crate::pb::*;

impl GitBare {
    /// Update mirror from a remote URL (fetch + update all refs).
    pub fn update_remote_mirror(
        &self,
        request: UpdateRemoteMirrorRequest,
    ) -> GitResult<UpdateRemoteMirrorResponse> {
        crate::sanitize::validate_remote_url(&request.remote_url)?;

        let remote_name = if request.remote_name.is_empty() {
            "origin"
        } else {
            &request.remote_name
        };
        crate::sanitize::validate_ref_name(remote_name)?;

        const MAX_REFSPECS: usize = 100;
        if request.refspecs.len() > MAX_REFSPECS {
            return Err(crate::error::GitError::InvalidArgument(format!(
                "too many refspecs (max {MAX_REFSPECS})"
            )));
        }
        for rs in &request.refspecs {
            crate::sanitize::validate_refspec(rs)?;
        }

        let remote_exists = std::process::Command::new("git")
            .args([
                "--git-dir",
                &self.bare_dir.to_string_lossy(),
                "remote",
                "get-url",
                remote_name,
            ])
            .output()
            .map(|output| output.status.success())
            .unwrap_or(false);

        let remote_command = if remote_exists { "set-url" } else { "add" };
        let remote_output = std::process::Command::new("git")
            .args([
                "--git-dir",
                &self.bare_dir.to_string_lossy(),
                "remote",
                remote_command,
                remote_name,
                &request.remote_url,
            ])
            .output()
            .map_err(|e| crate::error::GitError::CommandFailed {
                status_code: None,
                stderr: e.to_string(),
            })?;

        if !remote_output.status.success() {
            return Ok(UpdateRemoteMirrorResponse {
                ok: false,
                error: String::from_utf8_lossy(&remote_output.stderr)
                    .trim()
                    .to_string(),
            });
        }

        let mut fetch_args = vec![
            "--git-dir".to_string(),
            self.bare_dir.to_string_lossy().into_owned(),
            "fetch".to_string(),
            remote_name.to_string(),
        ];

        if request.prune {
            fetch_args.push("--prune".to_string());
        }
        if request.force {
            fetch_args.push("--force".to_string());
        }

        if request.refspecs.is_empty() {
            fetch_args.push("+refs/*:refs/*".to_string());
        } else {
            for rs in &request.refspecs {
                fetch_args.push(rs.clone());
            }
        }

        let output = std::process::Command::new("git")
            .args(&fetch_args)
            .stdout(std::process::Stdio::piped())
            .stderr(std::process::Stdio::piped())
            .output()
            .map_err(|e| crate::error::GitError::CommandFailed {
                status_code: None,
                stderr: e.to_string(),
            })?;

        if !output.status.success() {
            return Ok(UpdateRemoteMirrorResponse {
                ok: false,
                error: String::from_utf8_lossy(&output.stderr).trim().to_string(),
            });
        }

        // Update local HEAD to match remote HEAD
        let head_output = std::process::Command::new("git")
            .args([
                "--git-dir",
                &self.bare_dir.to_string_lossy(),
                "remote",
                "set-head",
                remote_name,
                "--auto",
            ])
            .output();

        if let Ok(out) = head_output
            && !out.status.success()
        {
            tracing::warn!(
                repo = %self.bare_dir.display(),
                stderr = %String::from_utf8_lossy(&out.stderr).trim(),
                "failed to auto-set remote HEAD"
            );
        }

        Ok(UpdateRemoteMirrorResponse {
            ok: true,
            error: String::new(),
        })
    }

    /// Fetch from a remote URL without mirroring.
    pub fn fetch_remote(&self, request: FetchRemoteRequest) -> GitResult<FetchRemoteResponse> {
        crate::sanitize::validate_remote_url(&request.remote_url)?;

        let remote_name = if request.remote_name.is_empty() {
            "origin"
        } else {
            &request.remote_name
        };
        crate::sanitize::validate_ref_name(remote_name)?;

        const MAX_FETCH_REFSPECS: usize = 100;
        if request.refspecs.len() > MAX_FETCH_REFSPECS {
            return Err(crate::error::GitError::InvalidArgument(format!(
                "too many refspecs (max {MAX_FETCH_REFSPECS})"
            )));
        }
        for rs in &request.refspecs {
            crate::sanitize::validate_refspec(rs)?;
        }

        let exists = std::process::Command::new("git")
            .args([
                "--git-dir",
                &self.bare_dir.to_string_lossy(),
                "remote",
                "get-url",
                remote_name,
            ])
            .output()
            .map(|o| o.status.success())
            .unwrap_or(false);

        if !exists {
            let remote_output = std::process::Command::new("git")
                .args([
                    "--git-dir",
                    &self.bare_dir.to_string_lossy(),
                    "remote",
                    "add",
                    remote_name,
                    &request.remote_url,
                ])
                .output()
                .map_err(|e| crate::error::GitError::CommandFailed {
                    status_code: None,
                    stderr: e.to_string(),
                })?;

            if !remote_output.status.success() {
                return Ok(FetchRemoteResponse {
                    ok: false,
                    error: String::from_utf8_lossy(&remote_output.stderr)
                        .trim()
                        .to_string(),
                });
            }
        }

        let mut args = vec![
            "--git-dir".to_string(),
            self.bare_dir.to_string_lossy().into_owned(),
            "fetch".to_string(),
            remote_name.to_string(),
        ];

        if request.prune {
            args.push("--prune".to_string());
        }
        if request.force {
            args.push("--force".to_string());
        }

        if request.refspecs.is_empty() {
            args.push("+refs/heads/*:refs/heads/*".to_string());
            args.push("+refs/tags/*:refs/tags/*".to_string());
        } else {
            for rs in &request.refspecs {
                args.push(rs.clone());
            }
        }

        let output = std::process::Command::new("git")
            .args(&args)
            .stdout(std::process::Stdio::piped())
            .stderr(std::process::Stdio::piped())
            .output()
            .map_err(|e| crate::error::GitError::CommandFailed {
                status_code: None,
                stderr: e.to_string(),
            })?;

        if !output.status.success() {
            return Ok(FetchRemoteResponse {
                ok: false,
                error: String::from_utf8_lossy(&output.stderr).trim().to_string(),
            });
        }

        Ok(FetchRemoteResponse {
            ok: true,
            error: String::new(),
        })
    }

    /// Clone a repository from a remote URL (bare + mirror).
    pub fn create_repository_from_url(&self, remote_url: &str, mirror: bool) -> GitResult<()> {
        crate::sanitize::validate_remote_url(remote_url)?;

        let mut args = vec!["clone".to_string()];
        args.push("--bare".to_string());
        if mirror {
            args.push("--mirror".to_string());
        }
        args.push(remote_url.to_string());
        args.push(self.bare_dir.to_string_lossy().into_owned());

        let result = duct::cmd("git", &args)
            .stdout_capture()
            .stderr_capture()
            .unchecked()
            .run()
            .map_err(|e| crate::error::GitError::CommandFailed {
                status_code: None,
                stderr: e.to_string(),
            })?;

        if !result.status.success() {
            return Err(crate::error::GitError::CommandFailed {
                status_code: result.status.code(),
                stderr: String::from_utf8_lossy(&result.stderr).into_owned(),
            });
        }

        Ok(())
    }
}