-- name: InsertTask :one
INSERT INTO tasks
	(id, organization_id, owner_id, name, display_name, workspace_id, template_version_id, template_parameters, prompt, created_at)
VALUES
	($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
RETURNING *;

-- name: UpdateTaskWorkspaceID :one
UPDATE
	tasks
SET
	workspace_id = $2
FROM
	workspaces w
JOIN
	template_versions tv
ON
	tv.template_id = w.template_id
WHERE
	tasks.id = $1
	AND tasks.workspace_id IS NULL
	AND w.id = $2
	AND tv.id = tasks.template_version_id
RETURNING
	tasks.*;

-- name: UpsertTaskWorkspaceApp :one
INSERT INTO task_workspace_apps
	(task_id, workspace_build_number, workspace_agent_id, workspace_app_id)
VALUES
	($1, $2, $3, $4)
ON CONFLICT (task_id, workspace_build_number)
DO UPDATE SET
	workspace_agent_id = EXCLUDED.workspace_agent_id,
	workspace_app_id = EXCLUDED.workspace_app_id
RETURNING *;

-- name: GetTaskByID :one
SELECT * FROM tasks_with_status WHERE id = @id::uuid;

-- name: GetTaskByWorkspaceID :one
SELECT * FROM tasks_with_status WHERE workspace_id = @workspace_id::uuid;

-- name: GetTaskByOwnerIDAndName :one
SELECT * FROM tasks_with_status
WHERE
	owner_id = @owner_id::uuid
	AND deleted_at IS NULL
	AND LOWER(name) = LOWER(@name::text);

-- name: ListTasks :many
SELECT * FROM tasks_with_status tws
WHERE tws.deleted_at IS NULL
AND CASE WHEN @owner_id::UUID != '00000000-0000-0000-0000-000000000000' THEN tws.owner_id = @owner_id::UUID ELSE TRUE END
AND CASE WHEN @organization_id::UUID != '00000000-0000-0000-0000-000000000000' THEN tws.organization_id = @organization_id::UUID ELSE TRUE END
AND CASE WHEN @status::text != '' THEN tws.status = @status::task_status ELSE TRUE END
ORDER BY tws.created_at DESC;

-- name: DeleteTask :one
WITH deleted_task AS (
	UPDATE tasks
	SET
		deleted_at = @deleted_at::timestamptz
	WHERE
		id = @id::uuid
		AND deleted_at IS NULL
	RETURNING id
), deleted_snapshot AS (
	DELETE FROM task_snapshots
	WHERE task_id = @id::uuid
)
SELECT id FROM deleted_task;


-- name: UpdateTaskPrompt :one
UPDATE
	tasks
SET
	prompt = @prompt::text
WHERE
	id = @id::uuid
	AND deleted_at IS NULL
RETURNING *;

-- name: UpsertTaskSnapshot :exec
INSERT INTO
	task_snapshots (task_id, log_snapshot, log_snapshot_created_at)
VALUES
	($1, $2, $3)
ON CONFLICT
	(task_id)
DO UPDATE SET
	log_snapshot = EXCLUDED.log_snapshot,
	log_snapshot_created_at = EXCLUDED.log_snapshot_created_at;

-- name: GetTaskSnapshot :one
SELECT
	*
FROM
	task_snapshots
WHERE
	task_id = $1;

-- name: GetTelemetryTaskEvents :many
-- Returns all data needed to build task lifecycle events for telemetry
-- in a single round-trip. For each task whose workspace is in the
-- given set, fetches:
--   - the latest workspace app binding (task_workspace_apps)
--   - the most recent stop and start builds (workspace_builds)
--   - the last "working" app status (workspace_app_statuses)
--   - the first app status after resume, for active workspaces
--
-- Assumptions:
-- - 1:1 relationship between tasks and workspaces. All builds on the
--   workspace are considered task-related.
-- - Idle duration approximation: If the agent reports "working", does
--   work, then reports "done", we miss that working time.
-- - lws and active_dur join across all historical app IDs for the task,
--   because each resume cycle provisions a new app ID. This ensures
--   pre-pause statuses contribute to idle duration and active duration.
WITH task_app_ids AS (
	SELECT task_id, workspace_app_id
	FROM task_workspace_apps
),
task_status_timeline AS (
	-- All app statuses across every historical app for each task,
	-- plus synthetic "boundary" rows at each stop/start build transition.
	-- This allows us to correctly take gaps due to pause/resume into account.
	SELECT tai.task_id, was.created_at, was.state::text AS state
	FROM workspace_app_statuses was
	JOIN task_app_ids tai ON tai.workspace_app_id = was.app_id
	UNION ALL
	SELECT t.id AS task_id, wb.created_at, '_boundary' AS state
	FROM tasks t
	JOIN workspace_builds wb ON wb.workspace_id = t.workspace_id
	WHERE t.deleted_at IS NULL
		AND t.workspace_id IS NOT NULL
		AND wb.build_number > 1
),
task_event_data AS (
	SELECT
		t.id AS task_id,
		t.workspace_id,
		twa.workspace_app_id,
		-- Latest stop build.
		stop_build.created_at AS stop_build_created_at,
		stop_build.reason AS stop_build_reason,
		-- Latest start build (task_resume only).
		start_build.created_at AS start_build_created_at,
		start_build.reason AS start_build_reason,
		start_build.build_number AS start_build_number,
		-- Last "working" app status (for idle duration).
		lws.created_at AS last_working_status_at,
		-- First app status after resume (for resume-to-status duration).
		-- Only populated for workspaces in an active phase (started more
		-- recently than stopped).
		fsar.created_at AS first_status_after_resume_at,
		-- Cumulative time spent in "working" state.
		active_dur.total_working_ms AS active_duration_ms
	FROM tasks t
	LEFT JOIN LATERAL (
		SELECT task_app.workspace_app_id
		FROM task_workspace_apps task_app
		WHERE task_app.task_id = t.id
		ORDER BY task_app.workspace_build_number DESC
		LIMIT 1
	) twa ON TRUE
	LEFT JOIN LATERAL (
		SELECT wb.created_at, wb.reason, wb.build_number
		FROM workspace_builds wb
		WHERE wb.workspace_id = t.workspace_id
			AND wb.transition = 'stop'
		ORDER BY wb.build_number DESC
		LIMIT 1
	) stop_build ON TRUE
	LEFT JOIN LATERAL (
		SELECT wb.created_at, wb.reason, wb.build_number
		FROM workspace_builds wb
		WHERE wb.workspace_id = t.workspace_id
			AND wb.transition = 'start'
		ORDER BY wb.build_number DESC
		LIMIT 1
	) start_build ON TRUE
	LEFT JOIN LATERAL (
		SELECT tst.created_at
		FROM task_status_timeline tst
		WHERE tst.task_id = t.id
			AND tst.state = 'working'
		-- Only consider status before the latest pause so that
		-- post-resume statuses don't mask pre-pause idle time.
		AND (stop_build.created_at IS NULL
			OR tst.created_at <= stop_build.created_at)
		ORDER BY tst.created_at DESC
		LIMIT 1
	) lws ON TRUE
	LEFT JOIN LATERAL (
		SELECT was.created_at
		FROM workspace_app_statuses was
		WHERE was.app_id = twa.workspace_app_id
			AND was.created_at > start_build.created_at
		ORDER BY was.created_at ASC
		LIMIT 1
	) fsar ON twa.workspace_app_id IS NOT NULL
		AND start_build.created_at IS NOT NULL
		AND (stop_build.created_at IS NULL
			OR start_build.created_at > stop_build.created_at)
	-- Active duration: cumulative time spent in "working" state across all
	-- historical app IDs for this task. Uses LEAD() to convert point-in-time
	-- statuses into intervals, then sums intervals where state='working'. For
	-- the last status, falls back to stop_build time (if paused) or @now (if
	-- still running).
	LEFT JOIN LATERAL (
		SELECT COALESCE(
			SUM(EXTRACT(EPOCH FROM (interval_end - interval_start)) * 1000)::bigint,
			0
		)::bigint AS total_working_ms
		FROM (
			SELECT
				tst.created_at AS interval_start,
				COALESCE(
					LEAD(tst.created_at) OVER (ORDER BY tst.created_at ASC, CASE WHEN tst.state = '_boundary' THEN 1 ELSE 0 END ASC),
					CASE WHEN stop_build.created_at IS NOT NULL
						AND (start_build.created_at IS NULL
							OR stop_build.created_at > start_build.created_at)
					THEN stop_build.created_at
					ELSE @now::timestamptz
					END
				) AS interval_end,
				tst.state
			FROM task_status_timeline tst
			WHERE tst.task_id = t.id
		) intervals
		WHERE intervals.state = 'working'
	) active_dur ON TRUE
	WHERE t.deleted_at IS NULL
		AND t.workspace_id IS NOT NULL
		AND EXISTS (
			SELECT 1 FROM workspace_builds wb
			WHERE wb.workspace_id = t.workspace_id
			  AND wb.created_at > @created_after
		)
)
SELECT * FROM task_event_data
ORDER BY task_id;