// Copyright 2019 Google 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 table

// contant_validate.go contains code that validates the user provided Content.

import (
	"errors"
	"fmt"

	"github.com/mum4k/termdash/internal/numbers"
	"github.com/mum4k/termdash/internal/wrap"
)

// validateContent validates the content instance.
func validateContent(content *Content) error {
	if got, min := int(content.cols), 1; got < min {
		return fmt.Errorf("invalid number of columns %d, must be a value in range %d <= v", got, min)
	}
	if got, min := content.opts.horizontalSpacing, 1; got != nil && *got < min {
		return fmt.Errorf("invalid horizontal spacing %d, must be a value in range %d <= v", *got, min)
	}
	if got, min := content.opts.verticalSpacing, 1; got != nil && *got < min {
		return fmt.Errorf("invalid vertical spacing %d, must be a value in range %d <= v", *got, min)
	}

	if got := len(content.opts.columnWidthsPercent); got > 0 {
		if want := int(content.cols); got != want {
			return fmt.Errorf("invalid number of widths in ColumnWidthsPercent %d, must be equal to the number of columns %d", got, want)
		}
		if sum, want := numbers.SumInts(content.opts.columnWidthsPercent), 100; sum != want {
			return fmt.Errorf("invalid sum of widths in ColumnWidthsPercent %d, must be %d", sum, want)
		}
	}

	if hr := content.header; hr != nil && hr.rowCallback != nil {
		return errors.New("the header row cannot have a callback assigned, header rows cannot be activated")
	}

	for _, row := range content.rows {
		for _, c := range row.cells {
			if got, min := c.colSpan, 1; got < min {
				return fmt.Errorf("invalid CellColSpan %d, must be a value in range %d <= v", got, min)
			}
			if got, min := c.rowSpan, 1; got < min {
				return fmt.Errorf("invalid CellRowSpan %d, must be a value in range %d <= v", got, min)
			}
			if err := validateHierarchical(c.hierarchical); err != nil {
				return err
			}
			for _, d := range c.data {
				if len(d.cells) == 0 {
					continue
				}
				if err := wrap.ValidCells(d.cells); err != nil {
					return fmt.Errorf("invalid data: %v", err)
				}
			}
		}

		if got, want := row.effectiveColumns(), int(content.cols); got != want {
			return fmt.Errorf("content has %d columns, but row %v has %d, all rows must occupy the same amount of columns", want, row, got)
		}
	}
	return nil
}

// validateHierarchical validates the provided hierarchical options including
// values set on all parents.
func validateHierarchical(ho *hierarchicalOptions) error {
	for ; ho != nil; ho = ho.parent {
		if got, min := ho.height, 1; got != nil && *got < min {
			return fmt.Errorf("invalid height %d, must be a value in range %d <= v", *got, min)
		}
		if got, min := ho.horizontalPadding, 1; got != nil && *got < min {
			return fmt.Errorf("invalid horizontal padding %d, must be a value in range %d <= v", *got, min)
		}
		if got, min := ho.verticalPadding, 1; got != nil && *got < min {
			return fmt.Errorf("invalid vertical padding %d, must be a value in range %d <= v", *got, min)
		}
	}
	return nil
}