use super::traits::{Tool, ToolResult};
use crate::config::Config;
use crate::cron::{self, DeliveryConfig, JobType, Schedule, SessionTarget};
use crate::security::SecurityPolicy;
use async_trait::async_trait;
use serde_json::json;
use std::sync::Arc;

pub struct CronAddTool {
    config: Arc<Config>,
    security: Arc<SecurityPolicy>,
}

impl CronAddTool {
    pub fn new(config: Arc<Config>, security: Arc<SecurityPolicy>) -> Self {
        Self { config, security }
    }

    fn enforce_mutation_allowed(&self, action: &str) -> Option<ToolResult> {
        if !self.security.can_act() {
            return Some(ToolResult {
                success: false,
                output: String::new(),
                error: Some(format!(
                    "Security policy: read-only mode, cannot perform '{action}'"
                )),
            });
        }

        if self.security.is_rate_limited() {
            return Some(ToolResult {
                success: false,
                output: String::new(),
                error: Some("Rate limit exceeded: too many actions in the last hour".to_string()),
            });
        }

        if !self.security.record_action() {
            return Some(ToolResult {
                success: false,
                output: String::new(),
                error: Some("Rate limit exceeded: action budget exhausted".to_string()),
            });
        }

        None
    }
}

#[async_trait]
impl Tool for CronAddTool {
    fn name(&self) -> &str {
        "cron_add"
    }

    fn description(&self) -> &str {
        "Create a scheduled cron job (shell or agent) with cron/at/every schedules. \
         Use job_type='agent' with a prompt to run the AI agent on schedule. \
         To deliver output to a channel (Discord, Telegram, Slack, Mattermost, Matrix), set \
         delivery={\"mode\":\"announce\",\"channel\":\"discord\",\"to\":\"<channel_id_or_chat_id>\"}. \
         This is the preferred tool for sending scheduled/delayed messages to users via channels."
    }

    fn parameters_schema(&self) -> serde_json::Value {
        json!({
            "type": "object",
            "properties": {
                "name": { "type": "string" },
                "schedule": {
                    "type": "object",
                    "description": "Schedule object: {kind:'cron',expr,tz?} | {kind:'at',at} | {kind:'every',every_ms}"
                },
                "job_type": { "type": "string", "enum": ["shell", "agent"] },
                "command": { "type": "string" },
                "prompt": { "type": "string" },
                "session_target": { "type": "string", "enum": ["isolated", "main"] },
                "model": { "type": "string" },
                "delivery": {
                    "type": "object",
                    "description": "Delivery config to send job output to a channel. Example: {\"mode\":\"announce\",\"channel\":\"discord\",\"to\":\"<channel_id>\"}",
                    "properties": {
                        "mode": { "type": "string", "enum": ["none", "announce"], "description": "Set to 'announce' to deliver output to a channel" },
                        "channel": { "type": "string", "enum": ["telegram", "discord", "slack", "mattermost", "matrix"], "description": "Channel type to deliver to" },
                        "to": { "type": "string", "description": "Target: Discord channel ID, Telegram chat ID, Slack channel, etc." },
                        "best_effort": { "type": "boolean", "description": "If true, delivery failure does not fail the job" }
                    }
                },
                "delete_after_run": { "type": "boolean" },
                "approved": {
                    "type": "boolean",
                    "description": "Set true to explicitly approve medium/high-risk shell commands in supervised mode",
                    "default": false
                }
            },
            "required": ["schedule"]
        })
    }

    async fn execute(&self, args: serde_json::Value) -> anyhow::Result<ToolResult> {
        if !self.config.cron.enabled {
            return Ok(ToolResult {
                success: false,
                output: String::new(),
                error: Some("cron is disabled by config (cron.enabled=false)".to_string()),
            });
        }

        let schedule = match args.get("schedule") {
            Some(v) => match serde_json::from_value::<Schedule>(v.clone()) {
                Ok(schedule) => schedule,
                Err(e) => {
                    return Ok(ToolResult {
                        success: false,
                        output: String::new(),
                        error: Some(format!("Invalid schedule: {e}")),
                    });
                }
            },
            None => {
                return Ok(ToolResult {
                    success: false,
                    output: String::new(),
                    error: Some("Missing 'schedule' parameter".to_string()),
                });
            }
        };

        let name = args
            .get("name")
            .and_then(serde_json::Value::as_str)
            .map(str::to_string);

        let job_type = match args.get("job_type").and_then(serde_json::Value::as_str) {
            Some("agent") => JobType::Agent,
            Some("shell") => JobType::Shell,
            Some(other) => {
                return Ok(ToolResult {
                    success: false,
                    output: String::new(),
                    error: Some(format!("Invalid job_type: {other}")),
                });
            }
            None => {
                if args.get("prompt").is_some() {
                    JobType::Agent
                } else {
                    JobType::Shell
                }
            }
        };

        let default_delete_after_run = matches!(schedule, Schedule::At { .. });
        let delete_after_run = args
            .get("delete_after_run")
            .and_then(serde_json::Value::as_bool)
            .unwrap_or(default_delete_after_run);
        let approved = args
            .get("approved")
            .and_then(serde_json::Value::as_bool)
            .unwrap_or(false);

        let result = match job_type {
            JobType::Shell => {
                let command = match args.get("command").and_then(serde_json::Value::as_str) {
                    Some(command) if !command.trim().is_empty() => command,
                    _ => {
                        return Ok(ToolResult {
                            success: false,
                            output: String::new(),
                            error: Some("Missing 'command' for shell job".to_string()),
                        });
                    }
                };

                if let Err(reason) = self.security.validate_command_execution(command, approved) {
                    return Ok(ToolResult {
                        success: false,
                        output: String::new(),
                        error: Some(reason),
                    });
                }

                if let Some(blocked) = self.enforce_mutation_allowed("cron_add") {
                    return Ok(blocked);
                }

                cron::add_shell_job_with_approval(&self.config, name, schedule, command, approved)
            }
            JobType::Agent => {
                let prompt = match args.get("prompt").and_then(serde_json::Value::as_str) {
                    Some(prompt) if !prompt.trim().is_empty() => prompt,
                    _ => {
                        return Ok(ToolResult {
                            success: false,
                            output: String::new(),
                            error: Some("Missing 'prompt' for agent job".to_string()),
                        });
                    }
                };

                let session_target = match args.get("session_target") {
                    Some(v) => match serde_json::from_value::<SessionTarget>(v.clone()) {
                        Ok(target) => target,
                        Err(e) => {
                            return Ok(ToolResult {
                                success: false,
                                output: String::new(),
                                error: Some(format!("Invalid session_target: {e}")),
                            });
                        }
                    },
                    None => SessionTarget::Isolated,
                };

                let model = args
                    .get("model")
                    .and_then(serde_json::Value::as_str)
                    .map(str::to_string);

                let delivery = match args.get("delivery") {
                    Some(v) => match serde_json::from_value::<DeliveryConfig>(v.clone()) {
                        Ok(cfg) => Some(cfg),
                        Err(e) => {
                            return Ok(ToolResult {
                                success: false,
                                output: String::new(),
                                error: Some(format!("Invalid delivery config: {e}")),
                            });
                        }
                    },
                    None => None,
                };

                if let Some(blocked) = self.enforce_mutation_allowed("cron_add") {
                    return Ok(blocked);
                }

                cron::add_agent_job(
                    &self.config,
                    name,
                    schedule,
                    prompt,
                    session_target,
                    model,
                    delivery,
                    delete_after_run,
                )
            }
        };

        match result {
            Ok(job) => Ok(ToolResult {
                success: true,
                output: serde_json::to_string_pretty(&json!({
                    "id": job.id,
                    "name": job.name,
                    "job_type": job.job_type,
                    "schedule": job.schedule,
                    "next_run": job.next_run,
                    "enabled": job.enabled
                }))?,
                error: None,
            }),
            Err(e) => Ok(ToolResult {
                success: false,
                output: String::new(),
                error: Some(e.to_string()),
            }),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::config::Config;
    use crate::security::AutonomyLevel;
    use tempfile::TempDir;

    async fn test_config(tmp: &TempDir) -> Arc<Config> {
        let config = Config {
            workspace_dir: tmp.path().join("workspace"),
            config_path: tmp.path().join("config.toml"),
            ..Config::default()
        };
        tokio::fs::create_dir_all(&config.workspace_dir)
            .await
            .unwrap();
        Arc::new(config)
    }

    fn test_security(cfg: &Config) -> Arc<SecurityPolicy> {
        Arc::new(SecurityPolicy::from_config(
            &cfg.autonomy,
            &cfg.workspace_dir,
        ))
    }

    #[tokio::test]
    async fn adds_shell_job() {
        let tmp = TempDir::new().unwrap();
        let cfg = test_config(&tmp).await;
        let tool = CronAddTool::new(cfg.clone(), test_security(&cfg));
        let result = tool
            .execute(json!({
                "schedule": { "kind": "cron", "expr": "*/5 * * * *" },
                "job_type": "shell",
                "command": "echo ok"
            }))
            .await
            .unwrap();

        assert!(result.success, "{:?}", result.error);
        assert!(result.output.contains("next_run"));
    }

    #[tokio::test]
    async fn blocks_disallowed_shell_command() {
        let tmp = TempDir::new().unwrap();
        let mut config = Config {
            workspace_dir: tmp.path().join("workspace"),
            config_path: tmp.path().join("config.toml"),
            ..Config::default()
        };
        config.autonomy.allowed_commands = vec!["echo".into()];
        config.autonomy.level = AutonomyLevel::Supervised;
        tokio::fs::create_dir_all(&config.workspace_dir)
            .await
            .unwrap();
        let cfg = Arc::new(config);
        let tool = CronAddTool::new(cfg.clone(), test_security(&cfg));

        let result = tool
            .execute(json!({
                "schedule": { "kind": "cron", "expr": "*/5 * * * *" },
                "job_type": "shell",
                "command": "curl https://example.com"
            }))
            .await
            .unwrap();

        assert!(!result.success);
        assert!(result.error.unwrap_or_default().contains("not allowed"));
    }

    #[tokio::test]
    async fn blocks_mutation_in_read_only_mode() {
        let tmp = TempDir::new().unwrap();
        let mut config = Config {
            workspace_dir: tmp.path().join("workspace"),
            config_path: tmp.path().join("config.toml"),
            ..Config::default()
        };
        config.autonomy.level = AutonomyLevel::ReadOnly;
        std::fs::create_dir_all(&config.workspace_dir).unwrap();
        let cfg = Arc::new(config);
        let tool = CronAddTool::new(cfg.clone(), test_security(&cfg));

        let result = tool
            .execute(json!({
                "schedule": { "kind": "cron", "expr": "*/5 * * * *" },
                "job_type": "shell",
                "command": "echo ok"
            }))
            .await
            .unwrap();

        assert!(!result.success);
        let error = result.error.unwrap_or_default();
        assert!(error.contains("read-only") || error.contains("not allowed"));
    }

    #[tokio::test]
    async fn blocks_add_when_rate_limited() {
        let tmp = TempDir::new().unwrap();
        let mut config = Config {
            workspace_dir: tmp.path().join("workspace"),
            config_path: tmp.path().join("config.toml"),
            ..Config::default()
        };
        config.autonomy.level = AutonomyLevel::Full;
        config.autonomy.max_actions_per_hour = 0;
        std::fs::create_dir_all(&config.workspace_dir).unwrap();
        let cfg = Arc::new(config);
        let tool = CronAddTool::new(cfg.clone(), test_security(&cfg));

        let result = tool
            .execute(json!({
                "schedule": { "kind": "cron", "expr": "*/5 * * * *" },
                "job_type": "shell",
                "command": "echo ok"
            }))
            .await
            .unwrap();

        assert!(!result.success);
        assert!(result
            .error
            .unwrap_or_default()
            .contains("Rate limit exceeded"));
        assert!(cron::list_jobs(&cfg).unwrap().is_empty());
    }

    #[tokio::test]
    async fn medium_risk_shell_command_requires_approval() {
        let tmp = TempDir::new().unwrap();
        let mut config = Config {
            workspace_dir: tmp.path().join("workspace"),
            config_path: tmp.path().join("config.toml"),
            ..Config::default()
        };
        config.autonomy.allowed_commands = vec!["touch".into()];
        config.autonomy.level = AutonomyLevel::Supervised;
        std::fs::create_dir_all(&config.workspace_dir).unwrap();
        let cfg = Arc::new(config);
        let tool = CronAddTool::new(cfg.clone(), test_security(&cfg));

        let denied = tool
            .execute(json!({
                "schedule": { "kind": "cron", "expr": "*/5 * * * *" },
                "job_type": "shell",
                "command": "touch cron-approval-test"
            }))
            .await
            .unwrap();
        assert!(!denied.success);
        assert!(denied
            .error
            .unwrap_or_default()
            .contains("explicit approval"));

        let approved = tool
            .execute(json!({
                "schedule": { "kind": "cron", "expr": "*/5 * * * *" },
                "job_type": "shell",
                "command": "touch cron-approval-test",
                "approved": true
            }))
            .await
            .unwrap();
        assert!(approved.success, "{:?}", approved.error);
    }

    #[tokio::test]
    async fn rejects_invalid_schedule() {
        let tmp = TempDir::new().unwrap();
        let cfg = test_config(&tmp).await;
        let tool = CronAddTool::new(cfg.clone(), test_security(&cfg));

        let result = tool
            .execute(json!({
                "schedule": { "kind": "every", "every_ms": 0 },
                "job_type": "shell",
                "command": "echo nope"
            }))
            .await
            .unwrap();

        assert!(!result.success);
        assert!(result
            .error
            .unwrap_or_default()
            .contains("every_ms must be > 0"));
    }

    #[tokio::test]
    async fn agent_job_requires_prompt() {
        let tmp = TempDir::new().unwrap();
        let cfg = test_config(&tmp).await;
        let tool = CronAddTool::new(cfg.clone(), test_security(&cfg));

        let result = tool
            .execute(json!({
                "schedule": { "kind": "cron", "expr": "*/5 * * * *" },
                "job_type": "agent"
            }))
            .await
            .unwrap();
        assert!(!result.success);
        assert!(result
            .error
            .unwrap_or_default()
            .contains("Missing 'prompt'"));
    }

    #[tokio::test]
    async fn delivery_schema_includes_matrix_channel() {
        let tmp = TempDir::new().unwrap();
        let cfg = test_config(&tmp).await;
        let tool = CronAddTool::new(cfg.clone(), test_security(&cfg));

        let values = tool.parameters_schema()["properties"]["delivery"]["properties"]["channel"]
            ["enum"]
            .as_array()
            .cloned()
            .unwrap_or_default();

        assert!(values.iter().any(|value| value == "matrix"));
    }
}
