package core

import (
	"fmt"
	. "github.com/tendermint/tendermint/common"
	"github.com/tendermint/tendermint/types"
)

//-----------------------------------------------------------------------------

func BlockchainInfo(minHeight, maxHeight uint) (*ResponseBlockchainInfo, error) {
	if maxHeight == 0 {
		maxHeight = blockStore.Height()
	} else {
		maxHeight = MinUint(blockStore.Height(), maxHeight)
	}
	if minHeight == 0 {
		minHeight = uint(MaxInt(1, int(maxHeight)-20))
	}
	log.Debug("BlockchainInfoHandler", "maxHeight", maxHeight, "minHeight", minHeight)

	blockMetas := []*types.BlockMeta{}
	for height := maxHeight; height >= minHeight; height-- {
		blockMeta := blockStore.LoadBlockMeta(height)
		blockMetas = append(blockMetas, blockMeta)
	}

	return &ResponseBlockchainInfo{blockStore.Height(), blockMetas}, nil
}

//-----------------------------------------------------------------------------

func GetBlock(height uint) (*ResponseGetBlock, error) {
	if height == 0 {
		return nil, fmt.Errorf("height must be greater than 0")
	}
	if height > blockStore.Height() {
		return nil, fmt.Errorf("height must be less than the current blockchain height")
	}

	blockMeta := blockStore.LoadBlockMeta(height)
	block := blockStore.LoadBlock(height)
	return &ResponseGetBlock{blockMeta, block}, nil
}