// Copyright 2024 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package ci

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"github.com/fatih/color"

	"github.com/dolthub/dolt/go/cmd/dolt/cli"
	"github.com/dolthub/dolt/go/cmd/dolt/commands"
	"github.com/dolthub/dolt/go/cmd/dolt/errhand"
	"github.com/dolthub/dolt/go/libraries/doltcore/env"
	"github.com/dolthub/dolt/go/libraries/doltcore/env/actions/dolt_ci"
	"github.com/dolthub/dolt/go/libraries/utils/argparser"
)

var importDocs = cli.CommandDocumentationContent{
	ShortDesc: "Import a Dolt continuous integration workflow file into the database",
	LongDesc: `Import a Dolt continuous integration workflow file into the database 
and create a Dolt commit.

Workflow YAML Specification:

  name: <workflow-name>

  on:
    push:
      branches: [<branch-name>, ...]
    pull_request:
      branches: [<branch-name>, ...]
      activities: [opened, closed, reopened, synchronized]
    workflow_dispatch: {}

  jobs:
    - name: <job-name>
      steps:
        # Saved query step
        - name: <step-name>
          saved_query_name: <query-name>
          saved_query_statement: <optional-sql-statement>
          expected_columns: <optional-expected-columns>
          expected_rows: <optional-expected-rows>

        # Dolt test step
        - name: <step-name>
          dolt_test_groups: [<group-name>, ...]   # optional
          dolt_test_tests:  [<test-name>,  ...]   # optional`,
	Synopsis: []string{
		"{{.LessThan}}file{{.GreaterThan}}",
	},
}

type ImportCmd struct{}

// Name implements cli.Command.
func (cmd ImportCmd) Name() string {
	return "import"
}

// Description implements cli.Command.
func (cmd ImportCmd) Description() string {
	return importDocs.ShortDesc
}

// RequiresRepo implements cli.Command.
func (cmd ImportCmd) RequiresRepo() bool {
	return true
}

// Docs implements cli.Command.
func (cmd ImportCmd) Docs() *cli.CommandDocumentation {
	ap := cmd.ArgParser()
	return cli.NewCommandDocumentation(importDocs, ap)
}

// Hidden should return true if this command should be hidden from the help text
func (cmd ImportCmd) Hidden() bool {
	return false
}

// ArgParser implements cli.Command.
func (cmd ImportCmd) ArgParser() *argparser.ArgParser {
	ap := argparser.NewArgParserWithMaxArgs(cmd.Name(), 1)
	return ap
}

// Exec implements cli.Command.
func (cmd ImportCmd) Exec(ctx context.Context, commandStr string, args []string, _ *env.DoltEnv, cliCtx cli.CliContext) int {
	ap := cmd.ArgParser()
	help, usage := cli.HelpAndUsagePrinters(cli.CommandDocsForCommandString(commandStr, importDocs, ap))
	apr := cli.ParseArgsOrDie(ap, args, help)

	var verr errhand.VerboseError
	verr = validateImportArgs(apr)
	if verr != nil {
		return commands.HandleVErrAndExitCode(verr, usage)
	}

	path := apr.Arg(0)
	absPath, err := filepath.Abs(path)
	if err != nil {
		return commands.HandleVErrAndExitCode(errhand.VerboseErrorFromError(err), usage)
	}

	queryist, err := cliCtx.QueryEngine(ctx)
	if err != nil {
		return commands.HandleVErrAndExitCode(errhand.VerboseErrorFromError(err), usage)
	}

	hasTables, err := dolt_ci.HasDoltCITables(queryist.Queryist, queryist.Context)
	if err != nil {
		return commands.HandleVErrAndExitCode(errhand.VerboseErrorFromError(err), usage)
	}
	if !hasTables {
		return commands.HandleVErrAndExitCode(errhand.VerboseErrorFromError(fmt.Errorf("dolt ci has not been initialized, please initialize with: dolt ci init")), usage)
	}

	workflowConfig, err := parseWorkflowConfig(absPath)
	if err != nil {
		return commands.HandleVErrAndExitCode(errhand.VerboseErrorFromError(err), usage)
	}

	err = dolt_ci.ValidateWorkflowConfig(workflowConfig)
	if err != nil {
		return commands.HandleVErrAndExitCode(errhand.VerboseErrorFromError(err), usage)
	}

	user, email, err := env.GetNameAndEmail(cliCtx.Config())
	if err != nil {
		return commands.HandleVErrAndExitCode(errhand.VerboseErrorFromError(err), usage)
	}
	wm := dolt_ci.NewWorkflowManager(user, email, queryist.Queryist.Query)

	err = wm.StoreAndCommit(queryist.Context, workflowConfig)
	if err != nil {
		errorText := err.Error()
		switch {
		case strings.Contains(errorText, "nothing to commit"):
			cli.Println(color.CyanString(fmt.Sprintf("Dolt CI Workflow '%s' up to date.", workflowConfig.Name.Value)))
			return 0
		default:
			return commands.HandleVErrAndExitCode(errhand.VerboseErrorFromError(err), usage)
		}
	}
	return 0
}

func parseWorkflowConfig(path string) (workflow *dolt_ci.WorkflowConfig, err error) {
	var f *os.File
	f, err = os.Open(path)
	if err != nil {
		return
	}
	defer func() {
		rerr := f.Close()
		if err == nil {
			err = rerr
		}
	}()
	workflow, err = dolt_ci.ParseWorkflowConfig(f)
	return
}

func validateImportArgs(apr *argparser.ArgParseResults) errhand.VerboseError {
	if apr.NArg() != 1 {
		return errhand.BuildDError("expected 1 argument").SetPrintUsage().Build()
	}
	return nil
}