package database

import (
	"context"
	"fmt"

	"github.com/google/uuid"
)

func (db *Database) GetPipelines() ([]Pipeline, error) {
	query := `
SELECT id, name, url, poll_interval
FROM pipelines;`

	pipelines := make([]Pipeline, 0)

	rows, err := db.Conn.Query(context.Background(), query)
	if err != nil {
		return pipelines, fmt.Errorf("Could not query database for pipelines: %w", err)
	}
	defer rows.Close()

	for rows.Next() {
		var pipeline Pipeline
		var idStr string
		if err := rows.Scan(&idStr, &pipeline.Name, &pipeline.Url, &pipeline.PollInterval); err != nil {
			return pipelines, err
		}

		pipeline.Id, err = uuid.Parse(idStr)
		if err != nil {
			return pipelines, err
		}
		pipelines = append(pipelines, pipeline)
	}

	return pipelines, nil
}

func (db *Database) GetPipelineById(id uuid.UUID) (Pipeline, error) {
	query := `
SELECT name, url, poll_interval
FROM pipelines
WHERE id=$1;`

	pipeline := Pipeline{
		Id: id,
	}

	err := db.Conn.QueryRow(context.Background(), query, id).Scan(&pipeline.Name, &pipeline.Url, &pipeline.PollInterval)
	if err != nil {
		return pipeline, fmt.Errorf("Could not query database for pipeline with id %v: %w", id.String(), err)
	}

	return pipeline, nil
}

func (db *Database) CreatePipeline(name string, url string, pollInterval int) (Pipeline, error) {
	query := `
INSERT INTO pipelines (id, name, url, poll_interval)
VALUES (uuid_generate_v4(), $1, $2, $3)
RETURNING id, name, url, poll_interval;`

	pipeline := Pipeline{}
	var idStr string
	err := db.Conn.QueryRow(context.Background(), query, name, url, pollInterval).Scan(&idStr, &pipeline.Name, &pipeline.Url, &pipeline.PollInterval)
	if err != nil {
		return pipeline, fmt.Errorf("Could not create pipeline: %w", err)
	}

	id, err := uuid.Parse(idStr)
	if err != nil {
		return pipeline, fmt.Errorf("Could not parse UUID generated by DB: %w", err)
	}

	pipeline.Id = id

	return pipeline, nil
}

func (db *Database) GetWebhooksForPipeline(id uuid.UUID) ([]Webhook, error) {
	query := `
SELECT id, server_type, secret
FROM webhooks
WHERE pipeline=$1;`

	webhooks := make([]Webhook, 0)

	rows, err := db.Conn.Query(context.Background(), query, id)
	if err != nil {
		return webhooks, fmt.Errorf("Could not get webhooks for pipeline with id \"%v\": %w", id, err)
	}
	defer rows.Close()

	for rows.Next() {
		var webhook Webhook
		var idStr string
		if err := rows.Scan(&idStr, &webhook.ServerType, &webhook.Secret); err != nil {
			return webhooks, err
		}

		webhook.Id, err = uuid.Parse(idStr)
		if err != nil {
			return webhooks, err
		}
		webhooks = append(webhooks, webhook)
	}

	return webhooks, nil
}

func (db *Database) GetWebhookById(id uuid.UUID) (Webhook, error) {
	query := `
SELECT server_type, secret, pipeline
FROM webhooks
WHERE id=$1;`

	webhook := Webhook{
		Id: id,
	}

	err := db.Conn.QueryRow(context.Background(), query, id).Scan(&webhook.ServerType, &webhook.Secret, &webhook.Pipeline)
	if err != nil {
		return webhook, fmt.Errorf("Could not query database for webhook with id %v: %w", id.String(), err)
	}

	return webhook, nil
}

func (db *Database) CreateWebhook(serverType WebhookSender, pipelineId uuid.UUID) (Webhook, error) {

	query := `
INSERT INTO webhooks (id, server_type, secret, pipeline)
VALUES (uuid_generate_v4(), $1, (select substr(md5(random()::text), 0, 50)), $2)
RETURNING id, server_type, secret, pipeline;`

	webhook := Webhook{}
	var idStr string
	err := db.Conn.QueryRow(context.Background(), query, string(serverType), pipelineId).Scan(&idStr, &webhook.ServerType, &webhook.Secret, &webhook.Pipeline)
	if err != nil {
		return webhook, err
	}

	id, err := uuid.Parse(idStr)
	if err != nil {
		return webhook, err
	}

	webhook.Id = id

	return webhook, nil
}

func (db *Database) CreateRun(pipelineId uuid.UUID) (Run, error) {
	query := `
INSERT INTO runs (id, pipeline, in_progress)
VALUES(uuid_generate_v4(), $1, true)
RETURNING id, pipeline, in_progress;`

	run := Run{}
	var idStr string
	err := db.Conn.QueryRow(context.Background(), query, pipelineId).Scan(&idStr, &run.Pipeline, &run.InProgress)
	if err != nil {
		return run, err
	}

	run.Id, err = uuid.Parse(idStr)
	if err != nil {
		return run, err
	}

	return run, nil
}

func (db *Database) UpdateRunResult(r Run) error {
	query := `
UPDATE runs
SET in_progress=$1, result=$2, stdout=$3, stderr=$4
WHERE id=$3;`

	// TODO: does r.Result need a pointer derefrence?
	_, err := db.Conn.Exec(context.Background(),
		query, r.InProgress, r.Result, r.Stdout, r.Stderr)

	return err
}

func (db *Database) GetRunsForPipeline(pipelineId uuid.UUID) ([]Run, error) {
	query := `
SELECT id, in_progress, result, stdout, stderr
FROM runs
WHERE pipeline=$1;`

	runs := make([]Run, 0)

	rows, err := db.Conn.Query(context.Background(), query, pipelineId)
	if err != nil {
		return runs, fmt.Errorf("Could not get runs for pipeline with id \"%v\": %w", pipelineId, err)
	}
	defer rows.Close()

	for rows.Next() {
		var run Run
		var idStr string
		if err := rows.Scan(
			&idStr,
			&run.InProgress,
			&run.Result,
			&run.Stdout,
			&run.Stderr,
		); err != nil {
			return runs, err
		}

		run.Id, err = uuid.Parse(idStr)
		if err != nil {
			return runs, err
		}
		runs = append(runs, run)
	}

	return runs, nil
}